Updated 3 books

A Textbook of Electrical Technology AC and DC Machines/chapter25.ipynb

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+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter 25: Elements of Electro-Mechanical Energy Conversion"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example Number 25.1, Page Number:876"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "\n",
+ "#variable declaration\n",
+ "sod=15#stator-core outer diameter\n",
+ "sid=10.05#stator-core inner diameter\n",
+ "rod=10.00#rotor-core outer diameter\n",
+ "rid=5#rotor-core inner diameter\n",
+ "a=8#axial lenght of the machine\n",
+ "b=1.20\n",
+ "ur=1000\n",
+ "#calculations\n",
+ "vs=(3.14/4)*((sod*sod)-(sid*sid))*a#volume of stator-core\n",
+ "vr=(3.14/4)*((rod*rod)-(rid*rid))*a#volume of rotor-core\n",
+ "va=(3.14/4)*((sid*sid)-(rod*rod))*a#volume of air-gap in the machine\n",
+ "ed=(.5*b*b)/(4*3.14*math.pow(10,-7))\n",
+ "e=ed*va*math.pow(10,-6)\n",
+ "edm=(.5*b*b)/(4*3.14*math.pow(10,-7)*ur)\n",
+ "es=edm*vs*math.pow(10,-6)\n",
+ "er=edm*vr*math.pow(10,-6)\n",
+ "kr=(vs+vr)/vs\n",
+ "ke=(es+er)/e\n",
+ "ratio=kr/ke\n",
+ "eratio=e/(es+er)\n",
+ "\n",
+ "#result\n",
+ "print \"Energy stored in air gap= \",e,\" Joules\"\n",
+ "print \"Energy stored in stator-core= \",round(es,2),\" Joules\"\n",
+ "print \"Energy stored in rotor core= \",er,\" Joules\"\n",
+ "print \"Ratio of energy dtored in air-gap to that stored in the cores=\",round(eratio)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Energy stored in air gap= 3.609 Joules\n",
+ "Energy stored in stator-core= 0.45 Joules\n",
+ "Energy stored in rotor core= 0.27 Joules\n",
+ "Ratio of energy dtored in air-gap to that stored in the cores= 5.0\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example Number 25.2, Page Number:877"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "import math\n",
+ "\n",
+ "#variable declaration\n",
+ "n=800#turns\n",
+ "area=5*5#cross sectional area\n",
+ "i=1.25#amp\n",
+ "x=0.25#cm\n",
+ "l=0.402\n",
+ "#calculations\n",
+ "p=4*3.14*10**(-7)*area*10**(-4)/(0.5*10**(-2))\n",
+ "l=n**2*p\n",
+ "em=.5*i*i*l\n",
+ "W=-1*0.5*n**2*4*3.14*10**(-7)*area*10**(-4)*i**2/(0.5*10**(-2))**2\n",
+ "\n",
+ "#result\n",
+ "print \"a)i)coil inductance=\",l,\"H\"\n",
+ "print \" ii)field energy stored=\",em,\"J\"\n",
+ "print \"b)mechanical energy output=\",W,\"NW\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "a)i)coil inductance= 0.40192 H\n",
+ " ii)field energy stored= 0.314 J\n",
+ "b)mechanical energy output= -62.8 NW\n"
+ ]
+ }
+ ],
+ "prompt_number": 13
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example Number 25.4, Page Number:882"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#variable declaration\n",
+ "lo=50#mH\n",
+ "xo=0.05#cm\n",
+ "r=0.5#ohm\n",
+ "x=0.075#cm\n",
+ "i2=3#A\n",
+ "x2=0.15#cm\n",
+ "\n",
+ "#calculation\n",
+ "l1=2*lo/(1+(x/xo))\n",
+ "lambda1=l1*i2*10**(-3)\n",
+ "W=0.5*l1*i2**2*10**(-3)\n",
+ "l2=2*lo/(1+(x2/xo))\n",
+ "lambda2=l2*i2*10**(-3)\n",
+ "w2=0.5*i2*(lambda1-lambda2)\n",
+ "\n",
+ "#result\n",
+ "print \"a)magnetic stored energy=\",W,\"J\"\n",
+ "print \"b)change in magnetic stored energy=\",w2,\"J\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": []
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example Number 25.5, Page Number:883"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#variable declaration\n",
+ "rc=0.5#ohm\n",
+ "v=3#V\n",
+ "i=6#A\n",
+ "l1=40#mH\n",
+ "l2=25#mH\n",
+ "wfld=0.5*l2*i*i*0.001\n",
+ "delE=0.5*i*i*0.001*(l1-l2)\n",
+ "\n",
+ "#result\n",
+ "print \"a)magnetic stored energy=\",wfld,\"J\"\n",
+ "print \"b)change in magnetic store energy=\",delE,\"J\""
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "a)magnetic stored energy= 0.45 J\n",
+ "b)change in magnetic store energy= 0.27 J\n"
+ ]
+ }
+ ],
+ "prompt_number": 3
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [],
+ "language": "python",
+ "metadata": {},
+ "outputs": []
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}