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diff --git a/f_by_df/chapter25.ipynb b/f_by_df/chapter25.ipynb new file mode 100644 index 00000000..894eff9f --- /dev/null +++ b/f_by_df/chapter25.ipynb @@ -0,0 +1,210 @@ +{ + "metadata": { + "name": "", + "signature": "sha256:9895a0f3fc78aa13cc793dfc60b4d616a3af11e4983465d122ac29be7197893e" + }, + "nbformat": 3, + "nbformat_minor": 0, + "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": {} + } + ] +}
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