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{
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{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Appendix B"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 2(b) : Page B1"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"#power absorbed\n",
"from numpy import sqrt, pi, cos, sin\n",
"vsrms=230 #volts\n",
"vm=(sqrt(2)*vsrms)/2 #volts\n",
"alpha1=45 #degree\n",
"alpha2=90 #degree\n",
"x1=45*(pi/180)\n",
"x2=90*(pi/180)\n",
"vldc1=(vm/pi)*(1+cos(alpha1*pi/180)) \n",
"vldc2=(vm/pi)*(1+cos(alpha2*pi/180)) \n",
"vlms1=vm*((1/pi)*(pi-x1+(sin(2*x1))/2))**(1/2) \n",
"vlms2=vm*((1/pi)*(pi-x2+(sin(2*x2))/2))**(1/2) \n",
"r1=100 #OHM\n",
"pl1=((vlms1)**2)/r1 #W\n",
"pl2=((vlms2)**2)/r1 #W\n",
"print \"power absorbed = %0.2f W\" %pl1\n",
"print \"power absorbed = %0.2f W\" %pl2"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"power absorbed = 240.47 W\n",
"power absorbed = 132.25 W\n"
]
}
],
"prompt_number": 14
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 5(b) Page B3"
]
},
{
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"input": [
"#power absorbed\n",
"v=400 #V\n",
"po=15 #kW\n",
"nfx=1440 #rpm\n",
"f=50 #Hz\n",
"z2=0.4+1J*1.6 #ohm\n",
"p=4\n",
"x=120 #Hz\n",
"ns=((x*f)/p) #rpm\n",
"s=((ns-nfx)/ns) #slip\n",
"ns1=(x*x)/p #rpm\n",
"nfl1=(1-s)*ns1 #rpm\n",
"print \"full load speed = %0.2f rpm\"%nfl1\n",
"sm=(z2.real)/(z2.imag) #slip\n",
"print \"slip is = \",sm\n",
"tfy=((po*10**3)/(2*pi*(nfl1/60))) #N-m\n",
"a=sm\n",
"tm=((a**2+s**2)/(2*a*s))*tfy #N-m\n",
"print \"maximum torque = %0.2f N-m\"%tm"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"full load speed = 3456.00 rpm\n",
"slip is = 0.25\n",
"maximum torque = 132.84 N-m\n"
]
}
],
"prompt_number": 16
}
],
"metadata": {}
}
]
}
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