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| author | priyanka | 2015-06-24 15:03:17 +0530 |
|---|---|---|
| committer | priyanka | 2015-06-24 15:03:17 +0530 |
| commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /2642/CH6/EX6.2 | |
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initial commit / add all books
Diffstat (limited to '2642/CH6/EX6.2')
| -rwxr-xr-x | 2642/CH6/EX6.2/Ex6_2.sce | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/2642/CH6/EX6.2/Ex6_2.sce b/2642/CH6/EX6.2/Ex6_2.sce new file mode 100755 index 000000000..9eff18b7b --- /dev/null +++ b/2642/CH6/EX6.2/Ex6_2.sce @@ -0,0 +1,35 @@ +// FUNDAMENTALS OF ELECTICAL MACHINES
+// M.A.SALAM
+// NAROSA PUBLISHING HOUSE
+// SECOND EDITION
+
+// Chapter 6 : CONTROL AND STARTING OF A DC MOTORS
+// Example : 6.2
+
+clc;clear; // clears the console and command history
+
+// Given data
+V_t = 230 // supply voltage in V
+I_a1 = 15 // dc shunt motor armature current in A
+N_1 = 650 // speed in rpm
+R_a = 0.4 // armature resistance in ohm
+R = 1 // variable resistance in series with the armature
+
+// caclulations
+// at full load
+E_b1 = V_t-I_a1*R_a // initial back emf in V
+E_b2 = V_t-I_a1*(R+R_a) // final back emf in V
+N_2 = N_1*(E_b2/E_b1) // speed at full load in rpm
+
+// at half load
+I_a21 = I_a1/2 // armature current in A
+E_b21 = V_t-I_a21*(R+R_a) // back emf in V
+N_21 = N_1*(E_b21/E_b1) // speed at half load torque in rpm
+
+
+
+// display the result
+disp("Example 6.2 solution");
+printf(" \n speed at full load \n N_2 = %.1f rpm \n", N_2);
+printf(" \n speed at half load torque \n N_21 = %.1f rpm \n", N_21);
+
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