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| author | Trupti Kini | 2017-02-03 23:30:49 +0600 |
|---|---|---|
| committer | Trupti Kini | 2017-02-03 23:30:49 +0600 |
| commit | 96f083c2b0f64e79e78589bae4b5372566ce4061 (patch) | |
| tree | 8d22ccbce153c7832f2dd164a56f25c0006e6e63 /Electric_Machines_by_C._I._Hubert/CHAPTER05.ipynb | |
| parent | 58ec3c0d1ed53a9c03bda2ce9c58576c40d29d25 (diff) | |
| download | Python-Textbook-Companions-96f083c2b0f64e79e78589bae4b5372566ce4061.tar.gz Python-Textbook-Companions-96f083c2b0f64e79e78589bae4b5372566ce4061.tar.bz2 Python-Textbook-Companions-96f083c2b0f64e79e78589bae4b5372566ce4061.zip | |
Added(A)/Deleted(D) following books
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_ilPyJ8g.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_3PIZdCZ.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_5MOwKRN.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_4BZsRLv.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_D6S5lj3.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_67txrIp.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_rPglyVc.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_6yxgHRk.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_Iq2SYN6.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_AI0j6iz.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_dqq0jBY.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_BeoNvNJ.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_ByleN6p.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_C5MN2xR.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_Y6fD7AV.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_CcK6hTx.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_O33oUvf.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_DFSwMy4.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_474uiLC.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_G3431Y7.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_6FxkZN9.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_J8Upmcr.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_mJo3HTQ.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_JCq8HAi.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_XY9Pn8L.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_K3IUht7.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_IGpUWB3.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_LJxLQlK.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_9wGFzOA.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_OLWlzHB.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_4wHa84D.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_PM35Sod.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_C7pfw6B.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_PcS3cZO.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_HTpmACc.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_PhUBCOd.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_FMYsyQL.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_QmSJVCe.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_9ypQlC1.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_SUM8Scj.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_UKQHPIE.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_UoR7uWv.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_sDuatqh.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_X9UCvRs.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_O3VudAg.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_YS5Nd1j.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_oO3ONmh.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_afmBatJ.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_9JxFKFd.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_bSQgnPm.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_jg3RGpS.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_bY2ZN66.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_9QKT9Zi.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_cTtPTGc.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_7zRh33K.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_cZSZMxi.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_sxn3SNy.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_gW7wZ6p.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_tWbQ8Pq.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_hov0efx.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_GqqK7m2.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_jpSDAMK.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_KTU5lgY.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_lccjYuj.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_H0c7r3u.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_mC9HXIe.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_1xuVkJg.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_nCAK7Pv.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_qFCBayQ.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_oWi1ZaJ.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_HGvWYP4.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_okp6S1t.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_A7bupXa.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_qXWKbys.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_IEJK6rC.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_qnXMBUI.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_ZbMx9hO.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_rd9Cqof.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_PhquDyD.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_riYWpjh.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_forNk4r.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_suexzMr.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_d5vdQB4.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_tGnsZHr.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_GTe4Vbd.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_wKmymt8.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_3ptASMI.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_zQEL5I0.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_6OPVCIi.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/c_zkr9kKy.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter25.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/chapter25.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter26.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/chapter26.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter27.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/chapter27.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter28.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/chapter28.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter29.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/chapter29.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter30.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/chapter30.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter31.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/chapter31.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter32.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/chapter32.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter33.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/chapter33.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter34.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/chapter34.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter35.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/chapter35.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter36.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/chapter36.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter37.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/chapter37.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter38.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/chapter38.ipynb
R A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chapter39.ipynb -> A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A._K._Theraja,_B.L_Thereja/chapter39.ipynb
D A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_GQsd2dA.ipynb
D A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_SN4SQdm.ipynb
D A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_cFyHAjr.ipynb
D A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_i45oeUA.ipynb
D A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_kFFOkoF.ipynb
D A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_lYTG7YP.ipynb
D A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_mfQgF34.ipynb
D A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_ojLdxoF.ipynb
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D A_Textbook_of_Electrical_Technology_AC_and_DC_Machines_by_A_K_Theraja_B_L_Thereja/chap_zc3inLB.ipynb
A Advanced_Measurements_And_Instrumentation_by_A._K._Sawhney/Ch1_JEDKX6y.ipynb
A Advanced_Measurements_And_Instrumentation_by_A._K._Sawhney/Ch2_h5C3e6Y.ipynb
A Advanced_Measurements_And_Instrumentation_by_A._K._Sawhney/Ch3_qFSzPBo.ipynb
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A Advanced_Measurements_And_Instrumentation_by_A._K._Sawhney/Ch5_Z3v5KUy.ipynb
A Advanced_Measurements_And_Instrumentation_by_A._K._Sawhney/Ch6_PAvun9L.ipynb
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A Advanced_Measurements_And_Instrumentation_by_A._K._Sawhney/screenshots/Screenshot_from_2_StwySDt.png
A An_Introduction_to_Electrical_Machines_and_Transformers_by_G._Mcphersion/CHAPTER01.ipynb
A An_Introduction_to_Electrical_Machines_and_Transformers_by_G._Mcphersion/CHAPTER02.ipynb
A An_Introduction_to_Electrical_Machines_and_Transformers_by_G._Mcphersion/CHAPTER03.ipynb
A An_Introduction_to_Electrical_Machines_and_Transformers_by_G._Mcphersion/CHAPTER04.ipynb
A An_Introduction_to_Electrical_Machines_and_Transformers_by_G._Mcphersion/CHAPTER05.ipynb
A An_Introduction_to_Electrical_Machines_and_Transformers_by_G._Mcphersion/CHAPTER06.ipynb
A An_Introduction_to_Electrical_Machines_and_Transformers_by_G._Mcphersion/CHAPTER08.ipynb
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A An_Introduction_to_Electrical_Machines_and_Transformers_by_G._Mcphersion/screenshots/Scr_EwDd0aP.png
A Electric_Machines_by_C._I._Hubert/CHAPTER01.ipynb
A Electric_Machines_by_C._I._Hubert/CHAPTER02.ipynb
A Electric_Machines_by_C._I._Hubert/CHAPTER03.ipynb
A Electric_Machines_by_C._I._Hubert/CHAPTER04.ipynb
A Electric_Machines_by_C._I._Hubert/CHAPTER05.ipynb
A Electric_Machines_by_C._I._Hubert/CHAPTER06.ipynb
A Electric_Machines_by_C._I._Hubert/CHAPTER07.ipynb
A Electric_Machines_by_C._I._Hubert/CHAPTER08.ipynb
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A Electric_Machines_by_C._I._Hubert/CHAPTER10.ipynb
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diff --git a/Electric_Machines_by_C._I._Hubert/CHAPTER05.ipynb b/Electric_Machines_by_C._I._Hubert/CHAPTER05.ipynb new file mode 100644 index 00000000..f3b97267 --- /dev/null +++ b/Electric_Machines_by_C._I._Hubert/CHAPTER05.ipynb @@ -0,0 +1,1480 @@ +{ + "cells": [ + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "# CHAPTER05 : CLASSIFICATION PERFORMANCE APPLICATIONS AND OPERATION OF THREE PHASE INDUCTION MACHINES" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E01 : Pg 173" + ] + }, + { + "cell_type": "code", + "execution_count": 1, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Locked rotor torque = 102.756521739 lb-ft\n", + "Breakdown torque = 86.772173913 lb-ft\n", + "Pull up torque = 75.3547826087 lb-ft\n" + ] + } + ], + "source": [ + "# Example 5.1\n", + "# Computation of minimum value of (a) Locked rotor torque (b) Breakdown torque\n", + "# (c) Pull up torque\n", + "# Page No. 173\n", + "# Given data\n", + "f=60.; # Frequency in Hz\n", + "p=6.; # Number of poles\n", + "hp=10.; # Horsepower\n", + "n=1150.; # Rated speed of machine\n", + "ns=120.*f/p;\n", + "# (a) Locked rotor torque\n", + "Trated=hp*5252./n; # Rated torque \n", + "Tlockedrotor=2.25*Trated;\n", + "# (b) Breakdown torque\n", + "Tbreakdown=1.90*Trated;\n", + "# (c) Pull up torque\n", + "Tpullup=1.65*Trated;\n", + "# Display result on command window\n", + "print\"Locked rotor torque =\",Tlockedrotor,\"lb-ft\"\n", + "print\"Breakdown torque =\",Tbreakdown,\"lb-ft\"\n", + "print\"Pull up torque =\",Tpullup,\"lb-ft\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E02 : Pg 180" + ] + }, + { + "cell_type": "code", + "execution_count": 2, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + "Slip = 0.0125\n", + "\n", + "Line current magnitude = 15.0898365811 A\n", + "\n", + "Line current angle = -30.2 deg\n", + "\n", + "Apparent power = 10390.9402326 W\n", + "\n", + "Active power = 6047.67163108 var\n", + "\n", + "Reactive power = 12022.7272727 VA\n", + "\n", + "Power factor of the motor = 0.864\n", + "\n", + "Equivalent rotor curret magnitude = 12.6578934123 A\n", + "\n", + "Equivalent rotor curret angle = -6.85 deg\n", + "\n", + "Stator copper loss = 136.621900826 W\n", + "\n", + "Rotor copper loss = 120.166699229 W\n", + "\n", + "Core loss = 606.519617558 W\n", + "\n", + "Air-gap power = 9613.33593829 W\n", + "\n", + "Mechanical power developed = 9493.16923906 W\n", + "\n", + "Developed torque = 56.3982375046 lb-ft\n", + "\n", + "Shaft horsepower = 12.5491045777 hp\n", + "\n", + "Shaft torque = 55.6184786853 lb-ft\n", + "\n", + "Effiency = 0.90094176325\n" + ] + } + ], + "source": [ + "# Example 5.2\n", + "# Determine (a) Slip (b) Line current (c) Apparent power, active power, \n", + "# reactive power and power factor of the motor (d) Equivalent rotor curret\n", + "# (e) Stator copper loss (f) Rotor copper loss (g) Core loss (h) Air-gap\n", + "# power (i) Mechanical power developed (j) Developed torque (k) Shaft \n", + "# horsepower (l) Shaft torque (m) Effiency \n", + "# Page No. 180\n", + "# Given data\n", + "from math import sqrt,pi,sin,cos \n", + "f=60.; # Frequency\n", + "P=6.; # Number of poles\n", + "nr=1185.;\n", + "R1=0.200; # Motor resistance\n", + "R2=0.250;\n", + "X1=1.20; # Motor reactance\n", + "X2=1.29;\n", + "Rfe=317.; # Field resistance\n", + "XM=42.; # Motor reactance\n", + "V=460.; # Voltage rating\n", + "PFPS=166.; # Stray loss\n", + "\n", + "# (a) Slip \n", + "ns=(120.*f)/P;\n", + "s=(ns-nr)/ns; # Speed difference\n", + "\n", + "# (b) Line current\n", + "Z2=20 + 1.29j;#(R2/s)+%i*X2;\n", + "# Complex to Polar form...\n", + "Z2_Mag=20.;#sqrt(real(Z2)**2+imag(Z2)**2); # Magnitude part\n", + "Z2_Ang =3.69;#atan(imag(Z2),real(Z2))*180/%pi; # Angle part\n", + "\n", + "Z0_Num_Mag=Rfe*XM; # Z0 numerator\n", + "Z0_Num_Ang=0+90; \n", + " \n", + "Z0_Den_R=Rfe; # Z0 denominator\n", + "Z0_Den_I=XM;\n", + "Z0_Den=317 + 42j;#Z0_Den_R+%i*Z0_Den_I;\n", + "# Complex to Polar form...\n", + "Z0_Den_Mag=320.;#sqrt(real(Z0_Den)**2+imag(Z0_Den)**2); # Magnitude part\n", + "Z0_Den_Ang =7.55;#atan(imag(Z0_Den),real(Z0_Den))*180/%pi; # Angle part\n", + "\n", + "Z0_Mag=Z0_Num_Mag/Z0_Den_Mag; # Magnitude of Z0\n", + "Z0_Ang=Z0_Num_Ang-Z0_Den_Ang; # Angle of Z0\n", + "\n", + "# Polar to Complex form\n", + "Z0_R=Z0_Mag*cos(-Z0_Ang*pi/180); # Real part of complex number\n", + "Z0_I=Z0_Mag*sin(Z0_Ang*pi/180); # Imaginary part of complex number\n", + "\n", + "# ZP computation\n", + "ZP_Num_Mag=Z2_Mag*Z0_Mag; # ZP numerator magnitude\n", + "ZP_Num_Ang=Z2_Ang+Z0_Ang; # ZP numerator angle\n", + "\n", + "ZP_Den_R=25.5;#real(Z2)+Z0_R; # Real part of ZP denominator\n", + "ZP_Den_I=42.6;#imag(Z2)+Z0_I; \n", + "ZP_Den=25.5 + 42.6j;#lZP_Den_R+%i*ZP_Den_I; # ZP in complex form\n", + "\n", + "# Complex to Polar form...\n", + "ZP_Den_Mag=49.6;#sqrt(real(ZP_Den)**2+imag(ZP_Den)**2); # Magnitude part\n", + "ZP_Den_Ang =59.1;#atan(imag(ZP_Den),real(ZP_Den))*180/%pi; # Angle part\n", + "\n", + "ZP_Mag=ZP_Num_Mag/ZP_Den_Mag; # Final vlaue of ZP in polar form\n", + "ZP_Ang=ZP_Num_Ang-ZP_Den_Ang;\n", + "# Polar to Complex form\n", + "ZP_R=ZP_Mag*cos(-ZP_Ang*pi/180); # Real part of complex number\n", + "ZP_I=ZP_Mag*sin(ZP_Ang*pi/180); # Imaginary part of complex number\n", + "\n", + "# Zin computation\n", + "ZP=15 + 7.65j;#ZP_R+%i*ZP_I; # Parallel impedance\n", + "Z1=0.2 + 1.2j;#R1+%i*X1;\n", + "Zin=Z1+ZP; # Input impedance\n", + "# Complex to Polar form...\n", + "Zin_Mag=17.6;#sqrt(real(Zin)**2+imag(Zin)**2); # Magnitude part\n", + "Zin_Ang =30.2;#atan(imag(Zin),real(Zin))*180/%pi; # Angle part\n", + "\n", + "# I1 computation\n", + "I1_Mag=(V/sqrt(3.))/Zin_Mag; # I1 magnitude\n", + "I1_Ang=0-Zin_Ang; # I1 angle\n", + "\n", + "# (c) Apparent power, active power, reactive power and power factor of the motor\n", + "S_Mag=3.*(V/sqrt(3.))*I1_Mag; # S magnitude\n", + "S_Ang=0-(-Zin_Ang); # S angle\n", + "\n", + "# Polar to Complex form\n", + "S_R=S_Mag*cos(-S_Ang*pi/180); # Real part of complex number\n", + "S_I=S_Mag*sin(S_Ang*pi/180); # Imaginary part of complex number\n", + "\n", + "FP=0.864;#cosd(S_Ang); # Power factor\n", + "\n", + "# (d) Equivalent rotor curret\n", + "E2_Mag=I1_Mag*ZP_Mag; # E2 magnitude\n", + "E2_Ang=I1_Ang+ZP_Ang; # E2 angle\n", + "\n", + "I2_Mag=E2_Mag/Z2_Mag; # I2 magnitude\n", + "I2_Ang=E2_Ang-Z2_Ang; # I2 angle\n", + "\n", + "# (e) Stator copper loss \n", + "Pscl=3.*I1_Mag**2.*R1;\n", + "\n", + "# (f) Rotor copper loss\n", + "Prel=3.*I2_Mag**2.*R2;\n", + "\n", + "# (g) Core loss \n", + "Pcore=3.*(E2_Mag**2./Rfe);\n", + "\n", + "# (h) Air-gap power\n", + "Pgap=Prel/s;\n", + "\n", + "# (i) Mechanical power developed\n", + "Pmech=Prel*(1.-s)/s;\n", + "\n", + "# (j) Developed torque \n", + "TD=(21.12*I2_Mag**2*R2)/(s*ns);\n", + "\n", + "# (k) Shaft horsepower\n", + "LOSS=Pscl+Prel+Pcore+PFPS;\n", + "Pshaft=(S_R-LOSS)/746.;\n", + "\n", + "# (l) Shaft torque\n", + "T=5252.*Pshaft/nr;\n", + "\n", + "# (m) Effiency \n", + "eta=Pshaft/S_R*746.;\n", + "\n", + "# Display result on command window\n", + "print\"\\nSlip =\",s\n", + "print\"\\nLine current magnitude =\",I1_Mag,\"A\"\n", + "print\"\\nLine current angle =\",I1_Ang,\"deg\"\n", + "print\"\\nApparent power =\",S_R,\"W\"\n", + "print\"\\nActive power =\",S_I,\"var\"\n", + "print\"\\nReactive power =\",S_Mag,\"VA\"\n", + "print\"\\nPower factor of the motor =\",FP\n", + "print\"\\nEquivalent rotor curret magnitude =\",I2_Mag,\"A\"\n", + "print\"\\nEquivalent rotor curret angle =\",I2_Ang,\"deg\"\n", + "print\"\\nStator copper loss =\",Pscl,\"W\"\n", + "print\"\\nRotor copper loss =\",Prel,\"W\"\n", + "print\"\\nCore loss =\",Pcore,\"W\"\n", + "print\"\\nAir-gap power =\",Pgap,\"W\"\n", + "print\"\\nMechanical power developed =\",Pmech,\"W\"\n", + "print\"\\nDeveloped torque =\",TD,\"lb-ft\"\n", + "print\"\\nShaft horsepower =\",Pshaft,\"hp\"\n", + "print\"\\nShaft torque =\",T,\"lb-ft\"\n", + "print\"\\nEffiency =\",eta" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E03 : Pg 184" + ] + }, + { + "cell_type": "code", + "execution_count": 3, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + "Speed at which maximum torque is developed = 1531.8 r/min\n", + "\n", + "Maximum torque that the machine can develop = 366.489979327 lb-ft\n", + "\n", + "Rated shaft torque = 119.977155911 lb-ft\n", + "\n", + "Maximum torque is developed at slip of 0.1490 and \n", + "hence machine is placed in design A category\n" + ] + } + ], + "source": [ + "# Example 5.3\n", + "# Computation of (a) Speed at which maximum torque is developed (b) Maximum \n", + "# torque that the machine can develop (c) Rated shaft torque (d) Which NEMA \n", + "# design fits this motor?\n", + "# Page No. 184\n", + "# Given data\n", + "from math import sqrt\n", + "f=60.; # Frequency in Hz\n", + "p=4.; # Number of poles\n", + "hp=40.; # Horsepower\n", + "n=1751.; # Rated speed of machine\n", + "v=460./sqrt(3.); # Voltage\n", + "s=0.1490; # Slip\n", + "R2=0.153; # Rotor resistance \n", + "R1=0.102;\n", + "X1=0.409; # Rotor reactance\n", + "X2=0.613;\n", + "\n", + "# (a) Speed at which maximum torque is developed \n", + "STDmax=R2/(sqrt(R1**2.+(X1+X2)**2.));\n", + "ns=120.*f/p; #stator spped\n", + "nr=ns*(1.-s);\n", + "\n", + "# (b) Maximum torque that the machine can develop\n", + "TDmax=(21.12*v**2.)/(2.*ns*(sqrt(R1**2.+(X1+X2)**2.)+R1));\n", + "\n", + "# (c) Rated shaft torque\n", + "TDshaft=hp*5252./n;\n", + "\n", + "# Display result on command window\n", + "print\"\\nSpeed at which maximum torque is developed =\",nr,\"r/min\"\n", + "print\"\\nMaximum torque that the machine can develop =\",TDmax,\"lb-ft\"\n", + "print\"\\nRated shaft torque =\",TDshaft,\"lb-ft\"\n", + "print\"\\nMaximum torque is developed at slip of 0.1490 and \\nhence machine is placed in design A category\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E04 : Pg 185" + ] + }, + { + "cell_type": "code", + "execution_count": 4, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + " Amount of torque that must be removed from the motor shaft = 28.3488636364 lb-ft\n", + "\n", + " Expected minimum starting torque for the lower voltage = 169.197954545 lb-ft\n", + "\n", + " Percent change in developed torque = -19.0 Percent\n" + ] + } + ], + "source": [ + "# Example 5.4\n", + "# Computation of (a) Amount of torque that must be removed from the motor \n", + "# shaft to maintain 1760r/min (b) Expected minimum startimg torque for the \n", + "# lower voltage (c) Percent change in developed torque caused by 10% drop in \n", + "# system voltage.\n", + "# Page No. 185\n", + "# Given data\n", + "hp=50.; # Horsepower\n", + "n=1760.; # Rated speed of machine\n", + "v1=460.;\n", + "# (a) Amount of torque that must be removed from the motor shaft to maintain \n", + "# 1760r/min\n", + "v2=v1*0.90;\n", + "Trated=hp*5252./n; #Rated torque \n", + "TD2=Trated*(v2/v1)**2.;\n", + "Treduction=Trated-TD2;\n", + "# (b) Expected minimum startimg torque for the lower voltage\n", + "Tlr=1.40*Trated;\n", + "Tlr2=Tlr*(v2/v1)**2;\n", + "# (c) Percent change in developed torque caused by 10% drop in system voltage\n", + "Tchange=(TD2-Trated)/Trated;\n", + "Tchanger=(Tlr2-Tlr)/Tlr;\n", + "# Display result on command window\n", + "print\"\\n Amount of torque that must be removed from the motor shaft =\",Treduction,\"lb-ft\"\n", + "print\"\\n Expected minimum starting torque for the lower voltage =\",Tlr2,\"lb-ft\"\n", + "print\"\\n Percent change in developed torque =\",Tchanger*100,\"Percent\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E05 : Pg 187" + ] + }, + { + "cell_type": "code", + "execution_count": 5, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + "Shaft speed = 588.875 r/min\n", + "\n", + "Rotor current referred to the stator = 111.916287976 A\n" + ] + } + ], + "source": [ + "# Example 5.5\n", + "# Computation of minimum value of (a) Shaft speed (b) Rotor current referred \n", + "# to the stator\n", + "# Page No. 187\n", + "# Given data\n", + "from math import sqrt\n", + "f=60.; # Frequency in Hz\n", + "p=12.; # Number of poles\n", + "nr=591.1; # Rated speed of machine\n", + "v=575.; # Voltage rating of the machine\n", + "R2=0.055;\n", + "\n", + "# (a) Shaft speed\n", + "ns=120.*f/p; # Speed (r/min)\n", + "s1=(ns-nr)/ns; # Slip 1\n", + "s2=1.25*s1; # Slip 2\n", + "nr1=ns*(1.-s2);\n", + "\n", + "# (b) Rotor current referred to the stator\n", + "V=v/sqrt(3.);\n", + "I2=V*s2/R2;\n", + "\n", + "# Display result on command window\n", + "print\"\\nShaft speed =\",nr1,\"r/min\"\n", + "print\"\\nRotor current referred to the stator =\",I2,\"A\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E06 : Pg 190" + ] + }, + { + "cell_type": "code", + "execution_count": 6, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + "New operating speed in case of voltage and frequency drop = 1100.72839506 r/min\n", + "\n", + "New shaft horsepower = 18.7358024691 hp\n" + ] + } + ], + "source": [ + "# Example 5.6\n", + "# Determine (a) New operating speed if a system disturbance causes a 10% drop\n", + "# in voltage and 6% drop in frequency (b) New shaft horsepower.\n", + "# Page No. 190\n", + "# Given data\n", + "etaV=0.90; # Efficiency related to voltage\n", + "V=230.; # Voltage\n", + "etaF=0.94; # Efficiency related to voltage\n", + "f=60.; # Frequency\n", + "N=6.; # Number of poles\n", + "nr1=1175.; # Speed of motor\n", + "P=20.; # Horsepower of motor\n", + "\n", + "# (a) New operating speed if a system disturbance causes a 10% drop in \n", + "# voltage and 6% drop in frequency\n", + "V2=etaV*V; # New voltage after 10% drop\n", + "f2=etaF*f; # New frequency after 6% drop\n", + "ns1=120.*f/N;\n", + "ns2=120.*0.94*f/N;\n", + "s1=(ns1-nr1)/ns1; # Speed difference\n", + "\n", + "s2=s1*((V/V2)**2.)*(f2/f); \n", + "nr2=ns2*(1.-s2); # New speed\n", + "\n", + "# (b) New shaft horsepower\n", + "P2=P*(nr2/nr1); # With a constant torque load T2=T1\n", + "\n", + "# Display result on command window\n", + "print\"\\nNew operating speed in case of voltage and frequency drop =\",nr2,\"r/min\"\n", + "print\"\\nNew shaft horsepower =\",P2,\"hp\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E07 : Pg 192" + ] + }, + { + "cell_type": "code", + "execution_count": 7, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + " Expected locked-rotor line current = 173.32173913 A\n" + ] + } + ], + "source": [ + "# Example 5.7\n", + "# Determine expected locked-rotor line current\n", + "# Page No. 192\n", + "# Given data\n", + "Ir1=151.; # Rated current\n", + "V1=230.; # Rated voltage\n", + "V2=220.; # Motor starting voltage\n", + "F1=60.; # Rated frequency\n", + "F2=50.; # Motor starting frequency\n", + "# Expected locked-rotor line current\n", + "Ir2=Ir1*((V2/F2)/(V1/F1));\n", + "# Display result on command window\n", + "print\"\\n Expected locked-rotor line current =\",Ir2,\"A\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E08 : Pg 193" + ] + }, + { + "cell_type": "code", + "execution_count": 8, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + "Expected minimum locked-rotor torque = 270.102857143 lb-ft\n", + "\n", + "Expected minimum locked-rotor torque after drop = 265.465984372 lb-ft\n" + ] + } + ], + "source": [ + "# Example 5.8\n", + "# Determine (a) Expected minimum locked-rotor torque (b) Repeat (a) when \n", + "# voltage and frequency dropped to 230V and 58Hz \n", + "# Page No. 193\n", + "# Given data\n", + "HPrated=75.; # Rated horsepower\n", + "nrated=1750.; # Rated speed\n", + "V1=240.; # Rated voltage\n", + "V2=230.; # Voltage after drop\n", + "F1=60.; # Rated frequency\n", + "F2=58.; # Frequency after drop\n", + "\n", + "# (a) Expected minimum locked-rotor torque\n", + "Trated=5252.*HPrated/nrated; # Rated torque\n", + "Tlr=Trated*1.2; # Minimum locked-rotor torque is 120% rated \n", + "\n", + "# (b) Expected minimum locked-rotor torque when voltage and frequency dropped \n", + "# to 230V and 58Hz \n", + "Tlr2=Tlr*((V2/F2)**2.)*((F1/V1)**2.);\n", + "\n", + "# Display result on command window\n", + "print\"\\nExpected minimum locked-rotor torque =\",Tlr,\"lb-ft\"\n", + "print\"\\nExpected minimum locked-rotor torque after drop =\",Tlr2,\"lb-ft\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E09 : Pg 194" + ] + }, + { + "cell_type": "code", + "execution_count": 9, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + "Shaft speed = 1470.15519161 r/min\n", + "\n", + "Slip = 0.019896538928\n" + ] + } + ], + "source": [ + "# Example 5.9\n", + "# Determine (a) Shaft r/min (b) Slip \n", + "# Page No. 194\n", + "# Given data\n", + "from math import sqrt\n", + "F1=60.; # Rated frequency\n", + "N=4.; # Number of poles\n", + "F2=50.; # New frequency\n", + "ns=1770.; # Rated speed\n", + "\n", + "# (a) Shaft r/min\n", + "ns60=120.*F1/N; # Speed at rated ferquency \n", + "ns50=120.*F2/N; # Speed at 50 Hz frequency\n", + "s60=(ns60-ns)/ns60; # Slip at 60 Hz frequency\n", + "\n", + "# Using eq. (5.16) and by solving..s50=29.251/nr50\n", + "# Using eq. (4.3) and solving for nr50 we get the quadratic equation..\n", + "# Using various values of quadratic equations, we have\n", + "a=1.;\n", + "b=-1500.;\n", + "c=43876.5;\n", + "r1=(-b+sqrt(b**2-4*a*c))/(2.*a); # Root 1\n", + "\n", + "r2=(-b-sqrt(b**2-4*a*c))/(2.*a); # Root 2\n", + "# Answer 'r2' is not valid\n", + "\n", + "# (b) Slip \n", + "s50=(ns50-r1)/ns50;\n", + "\n", + "# Display result on command window\n", + "print\"\\nShaft speed =\",r1,\"r/min\"\n", + "print\"\\nSlip =\",s50" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E10 : Pg 198" + ] + }, + { + "cell_type": "code", + "execution_count": 10, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + " Low range of rotor speed = 311.142857143 r/min\n", + "\n", + " High range of rotor speed = 504.0 r/min\n", + "\n", + " Required rheostat resistance = 0.114905179241 Ohm/phase\n" + ] + } + ], + "source": [ + "# Example 5.10\n", + "# Determine (a) Range of rotor speed (b) Required rheostat resistance\n", + "# Page No. 198\n", + "# Given data\n", + "from math import sqrt\n", + "F=60.; # Frequency of motor\n", + "P=14.; # Number of poles\n", + "SL=0.395; # Low speed point\n", + "SH=0.02; # High speed point\n", + "Stdmax=0.74; # Value at which TD is maximum (from curve B)\n", + "R1=0.403; # Motor resistance\n", + "R2=0.317;\n", + "X1=1.32; # Motor reactance\n", + "X2=1.32;\n", + "a=3.8; # Ratio of stator turns/phase to rotor turns/phase\n", + "\n", + "# (a) Range of rotor speed\n", + "ns=120.*F/P; # Speed\n", + "nrl=ns*(1.-SL); # Rotor low speed\n", + "nrh=ns*(1.-SH); # Rotor high speed\n", + "\n", + "# (b) Required rheostat resistance\n", + "Rrhe=Stdmax*(sqrt(R1**2.+(X1+X2)**2.))-R2;\n", + "Rehereq=Rrhe/a**2.;\n", + "\n", + "# Display result on command window\n", + "print\"\\n Low range of rotor speed =\",nrl,\"r/min\"\n", + "print\"\\n High range of rotor speed =\",nrh,\"r/min\"\n", + "print\"\\n Required rheostat resistance =\",Rehereq,\"Ohm/phase\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E11 : Pg 201" + ] + }, + { + "cell_type": "code", + "execution_count": 11, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + " Rotor frequency = 0.795 Hz\n", + "\n", + " Slip at which TDmax occurs = 0.079830908464\n", + "\n", + " Rotor speed at 1/2 rated torque = 1488.075 r/min\n", + "\n", + " Required rheostat resistance = 0.0627232651992 Ohm/phase\n", + "\n", + " Rated torque = 1423.16160282 lb-ft\n" + ] + } + ], + "source": [ + "# Example 5.11\n", + "# Determine (a) Rotor frequency (b) Slip at which TDmax occurs (c) Rotor speed\n", + "# at 1/2 rated torque load (d) Required rheostat resistance (e) Rated torque\n", + "# Page No. 201\n", + "# Given data\n", + "from math import sqrt\n", + "S=0.0159; # Slip\n", + "Fbr=50.; # Rated frequency\n", + "R1=0.00536; # Motor resistance\n", + "R2=0.00613;\n", + "X1=0.0383; # Motor reactance\n", + "X2=0.0383;\n", + "Rrhe=0; # Initial rheostat resistance\n", + "P=4.; # Number of poles\n", + "NR=1000.; # Rated speed\n", + "s1=0.0159; # Slip of rheostat\n", + "a=2.; # Stator to rotor turns ratio\n", + "hp=400.; # Motor horsepower\n", + "\n", + "# (a) Rotor frequency\n", + "fr=S*Fbr;\n", + "\n", + "# (b) Slip at which TDmax occurs\n", + "Stdmax=(R2+Rrhe)/(sqrt(R1**2.+(X1+X2)**2.));\n", + "\n", + "# (c) Rotor speed at 1/2 rated torque load \n", + "s=S*(0.5)*(R2/R2); # Rotor speed at 1/2 rated torque\n", + "ns=120.*Fbr/P; \n", + "nr=ns*(1.-s); # Rotor speed\n", + "\n", + "# (d) Required rheostat resistance\n", + "s2=(ns-NR)/ns;\n", + "Rrhe2=((s2/s1)*(1./0.5)*(R2+Rrhe))-R2; # rheostat resistance\n", + "Rrheostat=Rrhe2/a**2.;\n", + "\n", + "# (e) Rated torque\n", + "nr1=ns*(1.-s1); # Rated speed\n", + "T=hp*5252./nr1;\n", + "\n", + "\n", + "\n", + "# Display result on command window\n", + "print\"\\n Rotor frequency =\",fr,\"Hz\"\n", + "print\"\\n Slip at which TDmax occurs =\",Stdmax\n", + "print\"\\n Rotor speed at 1/2 rated torque =\",nr,\"r/min\"\n", + "print\"\\n Required rheostat resistance =\",Rrheostat,\"Ohm/phase\"\n", + "print\"\\n Rated torque =\",T,\"lb-ft\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E12 : Pg 202" + ] + }, + { + "cell_type": "code", + "execution_count": 12, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + "Percent change in rotor circuit resistance = 77.7777777778 Percent increase\n" + ] + } + ], + "source": [ + "# Example 5.12\n", + "# Determine the percent increase or decrease in rotor circuit resistance\n", + "# Page No. 202\n", + "# Given data\n", + "Stdmax1=0.45; # Maximum torque condition 1\n", + "Stdmax2=0.80; # Maximum torque condition 2\n", + "# Percent increase or decrease in rotor circuit resistance\n", + "PerCh=1/(Stdmax1/Stdmax2);\n", + "PerCh=PerCh-1;\n", + "# Display result on command window\n", + "print\"\\nPercent change in rotor circuit resistance =\",PerCh*100,\"Percent increase\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E13 : Pg 208" + ] + }, + { + "cell_type": "code", + "execution_count": 13, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + " Lower limit of expected range of in-rush current = 1054.29179591 A\n", + "\n", + " Upper limit of expected range of in-rush current = 1186.0782704 A\n" + ] + } + ], + "source": [ + "# Example 5.13\n", + "# Determine the expected in-rush current\n", + "# Page No. 208\n", + "# Given data\n", + "from math import sqrt\n", + "kva1=5.6; # KVA/hp lower limit from table 5.9\n", + "hp=150.; # Motor horsepower\n", + "Vline=460.; # Line voltage\n", + "kva2=6.3; # KVA/hp upper limit from table 5.9\n", + "# Expected in-rush current\n", + "# Lower limit of expected range of in-rush current is\n", + "Ilrss=(kva1*hp*1000)/(sqrt(3)*Vline); \n", + "# Upper limit of expected range of in-rush current is\n", + "Iulss=(kva2*hp*1000)/(sqrt(3)*Vline); \n", + "# Display result on command window\n", + "print\"\\n Lower limit of expected range of in-rush current =\",Ilrss,\"A\"\n", + "print\"\\n Upper limit of expected range of in-rush current =\",Iulss,\"A\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E14 : Pg 211" + ] + }, + { + "cell_type": "code", + "execution_count": 14, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + "Percent voltage unbalance = 2.58\n", + "\n", + "Expected approximate temperature rise = 124.64408 deg C\n", + "\n", + " Expected insulation life = 7.2476842001 years\n", + "\n", + " Required derating of motor = 27.6 hp\n" + ] + } + ], + "source": [ + "# Example 5.14\n", + "# Determine (a) Percent voltage unbalance (b) Expected approximate temp. rise\n", + "# if operating at rated load in a 40 deg ambient (c) Expected insulation life \n", + "# (d) Required derating of motor to prevent shortening isulation life.\n", + "# Page No. 211\n", + "# Given data\n", + "from math import sqrt\n", + "VL1=460.; # Line voltage 1\n", + "VL2=455.; # Line voltage 2\n", + "VL3=440.; # Line voltage 3 \n", + "Trated=110.; # Rated temp. (from table 5.8)\n", + "hp=30.; # Motor horsepower\n", + "\n", + "# (a) Percent voltage unbalance \n", + "Vavg=(VL1+VL2+VL3)/3.; # Average line voltage\n", + "\n", + "#VD1=abs(VL1-Vavg); # Voltage deviation from the average \n", + "#VD2=abs(VL2-Vavg); \n", + "#VD3=abs(VL3-Vavg); \n", + "#VD=[VD1 VD2 VD3]; \n", + "#VDMax=max(VD); # Choose maximum value of voltage deviation\n", + "PerUBV=2.58;#(VDMax/Vavg)*100;\n", + "\n", + "# (b) Expected approximate temp. rise if operating at rated load in a 40 deg\n", + "PerDeltaT=2.*PerUBV**2.; # Percent change in temp.\n", + "Tubv=Trated*(1.+(PerDeltaT/100.));\n", + "\n", + "# (c) Expected insulation life \n", + "DeltaT=Tubv-Trated; # Percent increase in motor temp.\n", + "RL=1./(2.**(DeltaT/10.)); # Relative life on insulation\n", + "EL=RL*20;\n", + "\n", + "# (d) Required derating of motor to prevent shortening isulation life\n", + "ReqDer=hp*0.92;\n", + "\n", + "# Display result on command window\n", + "print\"\\nPercent voltage unbalance =\",PerUBV\n", + "print\"\\nExpected approximate temperature rise =\",Tubv,\"deg C\"\n", + "print\"\\n Expected insulation life =\",EL,\"years\"\n", + "print\"\\n Required derating of motor =\",ReqDer,\"hp\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E15 : Pg 213" + ] + }, + { + "cell_type": "code", + "execution_count": 15, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + " Motor resistance 1 = 0.119131367292 Ohm\n", + "\n", + " Motor reactance 1 = 0.567292225201 Ohm\n", + "\n", + " Motor resistance 2 = 0.11345844504 Ohm\n", + "\n", + " Motor reactance 2 = 0.100978016086 Ohm\n", + "\n", + " Field resistance = 113.45844504 Ohm\n", + "\n", + " Reactance of motor = 20.8763538874 Ohm\n" + ] + } + ], + "source": [ + "# Example 5.15\n", + "# Determine the machine parameters in ohms\n", + "# Page No. 213\n", + "# Given data\n", + "from math import sqrt \n", + "V=460.; # Motor voltage\n", + "hp=50.; # Motor horsepower\n", + "r1=0.021; # Resistance\n", + "r2=0.020;\n", + "x1=0.100; # Reactance\n", + "x2=0.0178;\n", + "rfe=20.; \n", + "Xm=3.68; # Motor reactance\n", + "\n", + "# Machine parameters in ohms\n", + "Vbase=V/sqrt(3.); # Base voltage\n", + "Pbase=hp*746./3.; # Base power\n", + "Zbase=Vbase**2./Pbase; # Base impedance\n", + "\n", + "R1=r1*Zbase;\n", + "X1=x1*Zbase;\n", + "R2=r2*Zbase;\n", + "X2=x2*Zbase;\n", + "Rfe=rfe*Zbase;\n", + "XM=Xm*Zbase;\n", + "\n", + "# Display result on command window\n", + "print\"\\n Motor resistance 1 =\",R1,\"Ohm\"\n", + "print\"\\n Motor reactance 1 =\",X1,\"Ohm\"\n", + "print\"\\n Motor resistance 2 =\",R2,\"Ohm\"\n", + "print\"\\n Motor reactance 2 =\",X2,\"Ohm\"\n", + "print\"\\n Field resistance =\",Rfe,\"Ohm\"\n", + "print\"\\n Reactance of motor =\",XM,\"Ohm\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E16 : Pg 218" + ] + }, + { + "cell_type": "code", + "execution_count": 16, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + " Motor resistance 1 = 0.101694915254 Ohm/phase\n", + "\n", + " Motor reactance 1 = 0.407379662436 Ohm/phase\n", + "\n", + " Motor resistance 2 = 0.153299139443 Ohm/phase\n", + "\n", + " Motor reactance 2 = 0.611069493654 Ohm/phase\n", + "\n", + " Reactance of motor = 7.58314688225 Ohm/phase\n", + "\n", + " Combined friction, windage and core loss = 1446.05864407 W/phase\n", + "\n", + " No-load current as a percent of rated current = 56.5743944637 Percent\n" + ] + } + ], + "source": [ + "# Example 5.16\n", + "# Determine (a) R1, R2, X1, X2, XM and the combined core, friction and windage \n", + "# loss (b) Express the no-load current as a percent of rated current\n", + "# Page No. 218\n", + "# Given data\n", + "from math import sqrt\n", + "P3ph=2573.4; # 3-ph power of induction motor\n", + "Vline=36.2; # Line voltage\n", + "Iline=58; # Line current\n", + "P3phnl=4664.4; # No load power\n", + "Vlinenl=460.; # No load line volatge\n", + "Ilinenl=32.7; # No load line current\n", + "Vdc=12.; # DC voltage\n", + "Idc=59.; # DC current\n", + "F1=60.; # Rated frequency\n", + "F2=15.; # Test frequency\n", + "Irated=57.8; # Rated current\n", + " \n", + "# (a) R1, R2, X1, X2, XM and the combined core, friction and windage loss\n", + "Pbr15=P3ph/3.; # Power/phase\n", + "Vbr15=Vline/sqrt(3.); # Voltage/phase\n", + "Ibr15=Iline;\n", + "PNL=P3phnl/3.; # No load power/phase\n", + "VNL=Vlinenl/sqrt(3.); # No load voltage/phase\n", + "INL=Ilinenl; # No load current/phase\n", + "\n", + "# Determination of R1\n", + "Rdc=Vdc/Idc;\n", + "R1=Rdc/2.;\n", + "\n", + "# Determination of R2\n", + "Zbr15=Vbr15/Ibr15; # Impedance\n", + "Rbr15=Pbr15/Ibr15**2.;\n", + "R2=Rbr15-R1;\n", + "\n", + "# Determination of X1 and X2\n", + "Xbr15=sqrt(Zbr15**2.-Rbr15**2.);\n", + "Xbr60=Xbr15*(F1/F2);\n", + "X1=0.4*Xbr60; # From Table 5.10\n", + "X2=0.6*Xbr60;\n", + "\n", + "# Determination of XM\n", + "SNL=VNL*INL;\n", + "QNL=sqrt(SNL**2.-PNL**2.);\n", + "XNL=QNL/INL**2.;\n", + "XM=XNL-X1;\n", + "\n", + "# Determination of combined friction, windage and core loss\n", + "Ploss=PNL-(INL**2.*R1);\n", + "\n", + "# (b) No-load current as a percent of rated current\n", + "PerINL=INL*100./Irated;\n", + "\n", + "# Display result on command window\n", + "print\"\\n Motor resistance 1 =\",R1,\"Ohm/phase\"\n", + "print\"\\n Motor reactance 1 =\",X1,\"Ohm/phase\"\n", + "print\"\\n Motor resistance 2 = \",R2,\"Ohm/phase\"\n", + "print\"\\n Motor reactance 2 =\",X2,\"Ohm/phase\"\n", + "print\"\\n Reactance of motor =\",XM,\"Ohm/phase\"\n", + "print\"\\n Combined friction, windage and core loss =\",Ploss,\"W/phase\"\n", + "print\"\\n No-load current as a percent of rated current =\",PerINL,\"Percent\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E17 : Pg 223" + ] + }, + { + "cell_type": "code", + "execution_count": 17, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "Active power of the motor = -9232.86054488 W\n" + ] + } + ], + "source": [ + "# Example 5.17\n", + "# Determine the active power that the motor, driven as an induction generator\n", + "# delivers to the system.\n", + "# Page No. 223\n", + "# Given data\n", + "from math import sqrt,pi,sin,cos\n", + "ns=1200.; # Speed\n", + "nr=1215.;\n", + "R1=0.200; # Motor resistance\n", + "R2=0.250;\n", + "X1=1.20; # Motor reactance\n", + "X2=1.29;\n", + "Rfe=317.; # Field resistance\n", + "XM=42.; # Motor reactance\n", + "V=460.; # Voltage rating\n", + "\n", + "# Active power of the motor computation\n", + "s=(ns-nr)/ns; # Speed difference\n", + "Z2=-20 + 1.29j;#(R2/s)+%i*X2;\n", + "\n", + "# Complex to Polar form...\n", + "Z2_Mag=20.;#sqrt(real(Z2)**2+imag(Z2)**2); # Magnitude part\n", + "Z2_Ang =176.;#atan(imag(Z2),real(Z2))*180/%pi; # Angle part\n", + "\n", + "Z0_Num_Mag=Rfe*XM; # Z0 numerator\n", + "Z0_Num_Ang=0+90; \n", + " \n", + "Z0_Den_R=Rfe; # Z0 denominator\n", + "Z0_Den_I=XM;\n", + "Z0_Den=317 + 42j;#Z0_Den_R+%i*Z0_Den_I;\n", + "# Complex to Polar form...\n", + "Z0_Den_Mag=320.;#sqrt(real(Z0_Den)**2+imag(Z0_Den)**2); # Magnitude part\n", + "Z0_Den_Ang =7.55;#atan(imag(Z0_Den),real(Z0_Den))*180/%pi; # Angle part\n", + "\n", + "Z0_Mag=Z0_Num_Mag/Z0_Den_Mag; # Magnitude of Z0\n", + "Z0_Ang=Z0_Num_Ang-Z0_Den_Ang; # Angle of Z0\n", + "\n", + "# Polar to Complex form\n", + "Z0_R=Z0_Mag*cos(-Z0_Ang*pi/180); # Real part of complex number\n", + "Z0_I=Z0_Mag*sin(Z0_Ang*pi/180); # Imaginary part of complex number\n", + "\n", + "# ZP computation\n", + "ZP_Num_Mag=Z2_Mag*Z0_Mag; # ZP numerator magnitude\n", + "ZP_Num_Ang=Z2_Ang+Z0_Ang; # ZP numerator angle\n", + "\n", + "ZP_Den_R=-14.5;#real(Z2)+Z0_R; # Real part of ZP denominator\n", + "ZP_Den_I=42.6;#imag(Z2)+Z0_I; \n", + "ZP_Den=-14.5 + 42.6j;#ZP_Den_R+%i*ZP_Den_I; # ZP in complex form\n", + "\n", + "# Complex to Polar form...\n", + "ZP_Den_Mag=45.;#sqrt(real(ZP_Den)**2+imag(ZP_Den)**2); # Magnitude part\n", + "ZP_Den_Ang =109.;# atan(imag(ZP_Den),real(ZP_Den))*180/%pi; # Angle part\n", + "\n", + "ZP_Mag=ZP_Num_Mag/ZP_Den_Mag; # Final vlaue of ZP in polar form\n", + "ZP_Ang=ZP_Num_Ang-ZP_Den_Ang;\n", + "# Polar to Complex form\n", + "ZP_R=ZP_Mag*cos(-ZP_Ang*pi/180); # Real part of complex number\n", + "ZP_I=ZP_Mag*sin(ZP_Ang*pi/180); # Imaginary part of complex number\n", + "\n", + "# Zin computation\n", + "ZP=-16.1 + 9.3j;#ZP_R+%i*ZP_I; # Parallel impedance\n", + "Z1=0.2 + 1.2j;#R1+%i*X1;\n", + "Zin=Z1+ZP; # Input impedance\n", + "# Complex to Polar form...\n", + "Zin_Mag=19.;#sqrt(real(Zin)**2+imag(Zin)**2); # Magnitude part\n", + "Zin_Ang =146.;#atan(imag(Zin),real(Zin))*180/%pi; # Angle part\n", + "\n", + "# I1 computation\n", + "I1_Mag=(V/sqrt(3))/Zin_Mag; # I1 magnitude\n", + "I1_Ang=0-Zin_Ang; # I1 angle\n", + "\n", + "# S computation\n", + "S_Mag=3*(V/sqrt(3))*I1_Mag; # S magnitude\n", + "S_Ang=0-(-Zin_Ang); # S angle\n", + "\n", + "# Polar to Complex form\n", + "S_R=S_Mag*cos(-S_Ang*pi/180); # Real part of complex number\n", + "S_I=S_Mag*sin(S_Ang*pi/180); # Imaginary part of complex number\n", + "\n", + "# Display result on command window\n", + "print\"Active power of the motor =\",S_R,\"W\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E18 : Pg 231" + ] + }, + { + "cell_type": "code", + "execution_count": 18, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + "Locked rotor torque = 719.215600351 lb-ft\n", + "\n", + "Expected average in-rush current = 1051.15402271 A\n", + "\n", + "Locked rotor torque when motor is started at reduced voltage = 303.868591148 lb-ft\n", + "\n", + "In-rush line current = 443.95 A\n" + ] + } + ], + "source": [ + "# Example 5.18\n", + "# Computation of (a) Locked rotor torque and the expected average in rush \n", + "# current (b) Repeat part (a) assuming motor is started at reduced voltage \n", + "# with 65% tap (c) In rush line current line current when starting at reduced \n", + "# voltage\n", + "# Page No. 231\n", + "# Given data\n", + "from math import sqrt\n", + "P=125.; # Rated Voltage\n", + "n=1141.; # Speed of machine\n", + "hp=125.; # Horsepower rating of device \n", + "Vline=460.; # Line voltage\n", + "ns=1200.; # Stator speed\n", + "s=0.125; # Slip\n", + "ILS=683.; # Current at low side\n", + "# (a) Locked rotor torque and the expected average in rush current\n", + "Trated=P*5252./(n); # Rated torque\n", + "Tlr=1.25*Trated; # Locked rotor torque\n", + "kVA=(6.3+7.1)/2.;\n", + "Ilr=(kVA*1000.*hp)/(Vline*sqrt(3.)); # In-rush current\n", + "# (b) Locked rotor torque and the expected average in rush current when motor \n", + "# is started at reduced voltage\n", + "V2=0.65*Vline; # Voltage impressed across the stator\n", + "I=Ilr*0.65; # Average in-rush current\n", + "T2=Tlr*(V2/Vline)**2.; # Locked rotor toreque\n", + "nr=ns*(1.-s);\n", + "# (c) In rush line current line current when starting at reduced voltage\n", + "a=1./0.65; # Bank ratio of autotransformer\n", + "IHS=ILS/a;\n", + "# Display result on command window\n", + "print\"\\nLocked rotor torque =\",Tlr,\"lb-ft\"\n", + "print\"\\nExpected average in-rush current =\",Ilr,\"A\"\n", + "print\"\\nLocked rotor torque when motor is started at reduced voltage =\",T2,\"lb-ft\"\n", + "print\"\\nIn-rush line current =\",IHS,\"A\"" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E19 : Pg 233" + ] + }, + { + "cell_type": "code", + "execution_count": 19, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + " Locked rotor current per phase = 485.523078295 A\n", + "\n", + " Minimum locked rotor torque = 84.032 lb-ft\n", + "\n", + " Locked rotor current per phase when motor is delta connected = 1456.56923488 A\n", + "\n", + " Code letter = 19.3418647166\n" + ] + } + ], + "source": [ + "# Example 5.19\n", + "# Computation of (a) Locked rotor current per phase and minimum locked rotor \n", + "# torque when starting (b) Locked rotor current per phase when motor is delta \n", + "# connected (c) Code letter \n", + "# Page No.233\n", + "# Given data\n", + "from math import sqrt\n", + "V=460.; # Rated Voltage\n", + "Z=0.547; # Locked rotor impedance\n", + "n=1750.; # Speed of machine\n", + "hp=60.; # Horsepower rating of device\n", + "f=60.; # Frequency of motor \n", + "# (a) Locked rotor current per phase and minimum locked rotor torque \n", + "Vphase=V/sqrt(3.); # Voltage/phase\n", + "Ilr1=Vphase/Z; # Locked rotor current/phase\n", + "Trated=hp*5252./(n); # Rated torque\n", + "Tlr=1.4*Trated; # Locked rotor torque\n", + "T2=Tlr*(Vphase/V)**2.;\n", + "# (b) Locked rotor current per phase when motor is delta connected \n", + "Ilr=V/Z; # Locked rotor current/phase\n", + "Il=Ilr*sqrt(3.); # Line current\n", + "# (c) Code letter\n", + "Slr=sqrt(3.)*V*Il/1000.; # Code letter at rated voltage\n", + "kVA=Slr/f;\n", + "# Display result on command window\n", + "print\"\\n Locked rotor current per phase =\",Ilr1,\"A\"\n", + "print\"\\n Minimum locked rotor torque =\",T2,\"lb-ft\"\n", + "print\"\\n Locked rotor current per phase when motor is delta connected =\",Il,\"A\"\n", + "print\"\\n Code letter =\",kVA" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E20 : Pg 235" + ] + }, + { + "cell_type": "code", + "execution_count": 20, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + "Resistance of the resistors required = 0.409208864143 Ohm\n", + "\n", + "Stator voltage per phase at locked rotor = 63.882 V\n", + "\n", + "Expected minimum locked rotor torque = 1.5 Trated\n" + ] + } + ], + "source": [ + "# Example 5.20\n", + "# Computation of (a) Resistance of the resistors required to limit the locked \n", + "# rotor current to 3 times rated current (b) Stator voltage per phase at \n", + "# locked rotor (c) Expected minimum locked rotor torque when starting as a \n", + "# percent of rated torque\n", + "# Page No. 235\n", + "# Given data\n", + "from math import sqrt\n", + "Ilr=3.*78.; # Locked rotor current\n", + "Vbranch=132.79; # Branch voltage\n", + "Rlr=0.2549; #Locked rotor resistance\n", + "Xlr=0.0978; #Locked rotor impedance\n", + "f=60.; #Frequency of motor \n", + "Zlr=0.273;\n", + "\n", + "# (a) Resistance of the resistors required to limit the locked rotor current \n", + "# to 3 times rated current\n", + "Rex=sqrt((Vbranch**2./Ilr**2.)-(Rlr**2.))-Xlr;\n", + "\n", + "# (b) Stator voltage per phase at locked rotor \n", + "IZlr=Ilr*Zlr;\n", + "VT1_N=IZlr;\n", + "\n", + "# (c) Expected minimum locked rotor torque when starting as a percent of \n", + "# rated torque\n", + "# From table 5.1 --> Minimum locked rotor torque = 150% rated torque\n", + "\n", + "# Display result on command window\n", + "\n", + "print\"\\nResistance of the resistors required =\",Rex,\"Ohm\"\n", + "print\"\\nStator voltage per phase at locked rotor =\",VT1_N,\"V\"\n", + "print'\\nExpected minimum locked rotor torque = 1.5 Trated'" + ] + }, + { + "cell_type": "markdown", + "metadata": {}, + "source": [ + "## Example E21 : Pg 236" + ] + }, + { + "cell_type": "code", + "execution_count": 21, + "metadata": { + "collapsed": false + }, + "outputs": [ + { + "name": "stdout", + "output_type": "stream", + "text": [ + "\n", + "The inductance of each series connected inductor = 4.44444609821 mH\n", + "\n", + "The voltage rating of each series connected inductor = 80.4248018577 V\n" + ] + } + ], + "source": [ + "# Example 5.21\n", + "# Computation of Inductance and voltage rating of each series connected \n", + "# inductor required to limit the starting current to approximately 2*Irated. \n", + "# Page No. 236\n", + "# Given data\n", + "from math import sqrt,pi\n", + "KVA=6.7; # Average locked rotor KVA/hp\n", + "hp=7.5; # Motor horsepower\n", + "Vline=208.; # Line voltage\n", + "I=48.; # Total current\n", + "Rlr=0.294; # Locked rotor resistance\n", + "Xlr=0.809; # Locked rotor impedance\n", + "f=60.; # Frequency of motor\n", + "\n", + "# Corresponding approximate load current\n", + "Ilr=KVA*1000.*hp/(sqrt(3.)*Vline); \n", + "Vphase=Vline/sqrt(3.); # Voltage/phase\n", + "\n", + "# Applying ohm's law to one phase\n", + "Zlr=Vphase/Ilr; # Impedance\n", + "Xex=sqrt((Vphase**2./I**2.)-(Rlr**2.))-Xlr;\n", + "L=Xex/(2.*pi*f);\n", + "L=L*10.**03;\n", + "VXl=I*Xex;\n", + "\n", + "# Display result on command window\n", + "print\"\\nThe inductance of each series connected inductor =\",L,\"mH\"\n", + "print\"\\nThe voltage rating of each series connected inductor =\",VXl,\"V\"" + ] + } + ], + "metadata": { + "anaconda-cloud": {}, + "kernelspec": { + "display_name": "Python [Root]", + "language": "python", + "name": "Python [Root]" + }, + "language_info": { + "codemirror_mode": { + "name": "ipython", + "version": 2 + }, + "file_extension": ".py", + "mimetype": "text/x-python", + "name": "python", + "nbconvert_exporter": "python", + "pygments_lexer": "ipython2", + "version": "2.7.12" + } + }, + "nbformat": 4, + "nbformat_minor": 0 +} |