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{
"metadata": {
"name": "",
"signature": "sha256:c262c33cbbcf1d1756b9358f8cf1d8ed92f53825858905e2598fd8e15870c7ca"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 39: Special Machines"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example Number 39.1, Page Number:1537"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#variable description\n",
"p=8.0 #number of poles\n",
"tp=5.0 #number of teeth for each pole\n",
"nr=50.0 #number of rotor teeth\n",
"\n",
"#calculation\n",
"ns=p*tp #number of stator teeth\n",
"B=((nr-ns)*360)/(nr*ns) #stepping angle\n",
"\n",
"#result\n",
"print \"stepping angle is \",B,\"degrees\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"stepping angle is 1.8 degrees\n"
]
}
],
"prompt_number": 10
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example Number 39.2, Page Number:1537"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#variable declaration\n",
"B=2.5\n",
"rn=25\n",
"f=3600\n",
"\n",
"#calculation\n",
"r=360/B\n",
"s=r*rn\n",
"n=(B*f)/360\n",
"\n",
"#result\n",
"print \"Resolution =\",int(r),\"steps/revolution\"\n",
"print \" Number of steps required for the shaft to make 25 revolutions =\",int(s)\n",
"print \" Shaft speed\", int(n),\"rps\"\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
" Resolution = 144 steps/revolution\n",
"Number of steps required for the shaft to make 25 revolutions = 3600\n",
"Shaft speed 25 rps\n"
]
}
],
"prompt_number": 14
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example Number 39.3, Page Number:1544"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#variable declaration\n",
"B=15 #stepping angle\n",
"pn=3 #number of phases\n",
"nr=360/(pn*B) #number of rotor teeth\n",
"\n",
"#number of stator teeth\n",
"ns1=((360*nr)/(360-(nr*B))) #ns>nr\n",
"ns2=((360*nr)/(360+(nr*B))) #nr>ns\n",
"\n",
"#result\n",
"print \"When ns>nr: ns= \",ns1\n",
"print \"When nr>ns: ns= \",ns2"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"When ns>nr: ns= 12\n",
"When nr>ns: ns= 6\n"
]
}
],
"prompt_number": 40
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example Number 39.4, Page Number:1545"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#variable declaration\n",
"B=1.8\n",
"pn=4\n",
"\n",
"#calculation\n",
"nr=360/(pn*B) #number of rotor teeth\n",
"ns=nr\n",
"\n",
"#result\n",
"print \"Number of rotor teeth = \",int(nr)\n",
"print \"Number of statot teeth = \",int(ns)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Number of rotor teeth = 50.0\n",
"Number of statot teeth = 50.0\n"
]
}
],
"prompt_number": 18
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example Number 39.5, Page Number:1555"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math\n",
"\n",
"#variable declaration\n",
"er=20\n",
"\n",
"#calculation\n",
"a=40\n",
"e2=er*math.cos(math.radians(a))\n",
"e1=er*math.cos(math.radians(a-120))\n",
"e3=er*math.cos(math.radians(a+120))\n",
"\n",
"#result\n",
"print \"a) For a=40 degrees\"\n",
"print \" e2s=\" ,e2,\"V\"\n",
"print \" e1s=\" ,e1,\"V\"\n",
"print \" e3s=\" ,e3,\"V\"\n",
"\n",
"#calculation\n",
"a=(-40)\n",
"e2=er*math.cos(math.radians(a))\n",
"e1=er*math.cos(math.radians(a-120))\n",
"e3=er*math.cos(math.radians(a+120))\n",
"\n",
"#result\n",
"print \"b) For a=-40 degrees\"\n",
"print \" e2s=\" ,e2,\"V\"\n",
"print \" e1s=\" ,e1,\"V\"\n",
"print \" e3s=\" ,e3,\"V\"\n",
"\n",
"#calculation\n",
"a=30\n",
"e12=math.sqrt(3)*er*math.cos(math.radians(a-150))\n",
"e23=math.sqrt(3)*er*math.cos(math.radians(a-30))\n",
"e31=math.sqrt(3)*er*math.cos(math.radians(a+90))\n",
"\n",
"#result\n",
"print \"c) For a=30 degrees\"\n",
"print \" e12=\" ,e12,\"V\"\n",
"print \" e23=\" ,e23,\"V\"\n",
"print \" e31=\" ,e31,\"V\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"a) For a=40 degrees\n",
" e2s= 15.3208888624 V\n",
" e1s= 3.47296355334 V\n",
" e3s= -18.7938524157 V\n",
"b) For a=-40 degrees\n",
" e2s= 15.3208888624 V\n",
" e1s= -18.7938524157 V\n",
" e3s= 3.47296355334 V\n",
"c) For a=30 degrees\n",
" e12= -17.3205080757 V\n",
" e23= 34.6410161514 V\n",
" e31= -17.3205080757 V\n"
]
}
],
"prompt_number": 41
}
],
"metadata": {}
}
]
}
|
