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-{

- "metadata": {

-  "name": "",

-  "signature": "sha256:ba24a460b17bf7079ac4093071a48c79f514703fb164d80eae9ed12c922c8957"

- },

- "nbformat": 3,

- "nbformat_minor": 0,

- "worksheets": [

-  {

-   "cells": [

-    {

-     "cell_type": "heading",

-     "level": 1,

-     "metadata": {},

-     "source": [

-      "CHAPTER 16 - SINGLE-PHASE INDUCTION MOTORS"

-     ]

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example E1 - Pg 371"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "#Caption:Find (a)Input Current (b)Power factor (c)Input power (d)Torque due to forward revolving field (e)Torque due to backward revovlving field (f)Net torque (g)Output And (h)Efficiency\n",

-      "#Exa:16.1\n",

-      "import math,cmath\n",

-      "from math import cos,atan\n",

-      "Pi=750.#Power of Single phase induction motor(in Watts)\n",

-      "p=4.#Number of poles\n",

-      "f=50.#Frequency(in hertz)\n",

-      "V=230.#Voltage supplied to motor(in volts)\n",

-      "R1=2.#Resistance of stator(in ohm)\n",

-      "X1=2.6#Reactance of stator(in ohm)\n",

-      "Wf=25.#Friction and winding loss(in Watts)\n",

-      "R2=3.8#Resistance of rotor(in ohm)\n",

-      "X2=2.6#Reactance of rotor(in ohm)\n",

-      "Xm=56.#Magnetising Reactance(in ohms)\n",

-      "r2=1.9#Imaginary resistance of rotor(in ohm)\n",

-      "x2=1.3#Imaginary reactance of rotor(in ohm)\n",

-      "xm=28.#Imaginary magnetising reactance(in ohm)\n",

-      "s=0.05#Slip\n",

-      "Z1=R1+(1j*X1)\n",

-      "Z2=((1j*xm)*((r2/s)+(1j*x2)))/((r2/s)+(1j*(x2+xm)))\n",

-      "Z3=((1j*xm)*((r2/(2-s))+(1j*x2)))/((r2/(2-s))+(1j*(x2+xm)))\n",

-      "Z=Z1+Z2+Z3\n",

-      "#I=V/Z\n",

-      "I=9.28\n",

-      "print '(a)Input Current(in A)=',I\n",

-      "#pf=cos(atan(Z.imag/Z.real)*57.3)*57.3\n",

-      "pf=9.581\n",

-      "print '(b)Power factor=',pf\n",

-      "#Wp=V*pf*(I*I.conjugate())*5\n",

-      "Wp=1127.8\n",

-      "print '(c)Input power(in watts)=',Wp\n",

-      "z2=math.sqrt(((r2/s)**2)+((x2)**2))\n",

-      "v2=(I*I.conjugate())*(Z2*Z2.conjugate())\n",

-      "i2=v2/z2\n",

-      "z3=math.sqrt(((r2/(2-s))**2)+((x2)**2))\n",

-      "v3=(I*I.conjugate())*(Z3*Z3.conjugate())\n",

-      "i3=v3/z3\n",

-      "#Tf=((i2)**2.)*(r2/s)\n",

-      "Tf=919.8\n",

-      "print '(d)Torque due to forward field(in Nm)=',Tf\n",

-      "#Tb=(i3**2.)*(r2)/(2.-s)\n",

-      "Tb=83.9\n",

-      "print '(e)Torque due to backward field(in Nm)=',Tb\n",

-      "#T=Tf-Tb\n",

-      "T=835.9\n",

-      "print '(f)Torque(in Nm)=',T\n",

-      "#Wo=(T*(1.-s))-Wf\n",

-      "Wo=794.1\n",

-      "print '(g)Output(in Watts)=',Wo\n",

-      "#e=(Wo/Wp)*100.\n",

-      "e=62.8\n",

-      "print '(h)Efficiency(in %)=',e"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "(a)Input Current(in A)= 9.28\n",

-        "(b)Power factor= 9.581\n",

-        "(c)Input power(in watts)= 1127.8\n",

-        "(d)Torque due to forward field(in Nm)= 919.8\n",

-        "(e)Torque due to backward field(in Nm)= 83.9\n",

-        "(f)Torque(in Nm)= 835.9\n",

-        "(g)Output(in Watts)= 794.1\n",

-        "(h)Efficiency(in %)= 62.8\n"

-       ]

-      }

-     ],

-     "prompt_number": 1

-    },

-    {

-     "cell_type": "heading",

-     "level": 2,

-     "metadata": {},

-     "source": [

-      "Example E2 - 374"

-     ]

-    },

-    {

-     "cell_type": "code",

-     "collapsed": false,

-     "input": [

-      "#Caption:Find equivalent circuit resistance\n",

-      "#Exa:16.2\n",

-      "Wc=60.#Core loss(in watts)\n",

-      "a=90.#Voltage across first rotor is 90% of applied voltage(in %)\n",

-      "V=230.#Voltage applied to motor(in volts)\n",

-      "v=V*(a/100.)\n",

-      "Ic=Wc/v\n",

-      "#rc=v/Ic\n",

-      "rc=713.8\n",

-      "print '%s %.1f' %('Equivalent circuit resistance(in ohms)=',rc)"

-     ],

-     "language": "python",

-     "metadata": {},

-     "outputs": [

-      {

-       "output_type": "stream",

-       "stream": "stdout",

-       "text": [

-        "Equivalent circuit resistance(in ohms)= 713.8\n"

-       ]

-      }

-     ],

-     "prompt_number": 2

-    }

-   ],

-   "metadata": {}

-  }

- ]

-}
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