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{
"metadata": {
"name": "",
"signature": "sha256:6c3e9861fb7b86a80c4d5ca0c3d83de8fac426220f4a72ee4169a76eb0964c4c"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter10, Control of AC drives"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 10.15.1: page 10-42"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from math import pi\n",
"#slip,the air gap power and efficiency\n",
"#given data :\n",
"w=100 # in rad/sec\n",
"F1=50 #in Hz\n",
"P=4 \n",
"Ns=(120*F1)/P \n",
"ws=2*pi*(Ns/60) \n",
"s=((ws-w)/ws) \n",
"print \"part (1)\"\n",
"print \"slip is\", round(s,4),\" or \", round(s*100,2), \" % \"\n",
"print \"part (2)\"\n",
"T=100 # in N-M\n",
"w=100 # in rad/sec\n",
"Pag=ws*T \n",
"P_slip=s*Pag \n",
"P_mech=(1-s)*Pag \n",
"print \"(a)the air gap power, pag = %0.f W\" %Pag\n",
"print \"(b)slip power = %0.f W\" %P_slip\n",
"print \"(c)Mech o/p power, P_mech = %0.f W\" %P_mech\n",
"#air gap power is calculated wrong in the textbook\n",
"print \"part (3)\"\n",
"eta=(P_mech/Pag) \n",
"print \"efficiency of the rotor circuit is\", round(eta,4),\" or\", round(eta*100,2),\" % \""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"part (1)\n",
"slip is 0.3634 or 36.34 % \n",
"part (2)\n",
"(a)the air gap power, pag = 15708 W\n",
"(b)slip power = 5708 W\n",
"(c)Mech o/p power, P_mech = 10000 W\n",
"part (3)\n",
"efficiency of the rotor circuit is 0.6366 or 63.66 % \n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 10.15.2 :page 10-43"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"#voltage per phase,slip,slip frequency ,slip and rotor loss\n",
"#given data :\n",
"V_rms=240 # in volts\n",
"F1=50 #in Hz\n",
"Vs_rms=240/2 \n",
"print \"part (1)\"\n",
"print \"supply voltage = %0.2f V\"%Vs_rms\n",
"print \"part (2)\"\n",
"N=1440 # in rpm\n",
"P=4 # pole\n",
"Ns=(120*F1)/4 \n",
"S=((Ns-N)/Ns) \n",
"print \"slip is \", S, \" or\", S*100, \" % \"\n",
"print \"part (3)\"\n",
"S_frequency=S*F1 \n",
"print \"slip frequency = %0.2f Hz\" %S_frequency\n",
"print \"part (4)\"\n",
"f=2 #Hz\n",
"f1=25 #Hz\n",
"s=(f/f1) #\n",
"print \"slip is\", s, \" or\", s*100, \" % \"\n",
"print \"part (5)\"\n",
"F2=25 #in Hz\n",
"S1=(S_frequency/F2) \n",
"rotor_loss=S1/(1-S1) \n",
"print \"Rotor loss = %0.4f %%\" %rotor_loss "
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"part (1)\n",
"supply voltage = 120.00 V\n",
"part (2)\n",
"slip is 0.04 or 4.0 % \n",
"part (3)\n",
"slip frequency = 2.00 Hz\n",
"part (4)\n",
"slip is 0.08 or 8.0 % \n",
"part (5)\n",
"Rotor loss = 0.0870 %\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 10.15.6: page 10-45"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#voltage per phase , slip ,slip frequency and percentage rotor loss\n",
"Ns1=750 #\n",
"V_rms=240 # in volts\n",
"f2=25 #Hz\n",
"F1=50 #in Hz\n",
"Vs_rms=240/2 \n",
"N=1440 # in rpm\n",
"P=4 # pole\n",
"Ns=(120*F1)/4 \n",
"S=((Ns-N)/Ns) \n",
"S_frequency=S*F1 \n",
"fs12=S_frequency/4 #\n",
"S1=fs12/f2 \n",
"rotor_loss=S1/(1-S1) \n",
"n=Ns1-((S1*Ns1)) #\n",
"print \"supply voltage = %0.2f V\" %Vs_rms\n",
"print \"slip,S = %0.2f %%\"%(1*100)\n",
"print \"slip frequency at 50Hz = %0.2f Hz\"%S_frequency\n",
"print \"slip frequency at 25Hz = %0.2f Hz\"%fs12\n",
"print \"Rotor loss = %0.2f %%\" %rotor_loss \n",
"print \"speed = %0.2f rpm\" %n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"supply voltage = 120.00 V\n",
"slip,S = 100.00 %\n",
"slip frequency at 50Hz = 2.00 Hz\n",
"slip frequency at 25Hz = 0.50 Hz\n",
"Rotor loss = 0.02 %\n",
"speed = 735.00 rpm\n"
]
}
],
"prompt_number": 3
}
],
"metadata": {}
}
]
}
|
