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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"CHAPTER 5: ARMATURE REACTION AND COMMUTATION IN DYNAMOS"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 5.1, Page number 140"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Variable declaration\n",
"conductors = 800.0 #Number of conductors \n",
"I_a = 1000.0 #Rated armature current(A)\n",
"P = 10.0 #Number of poles\n",
"pitch = 0.7 #Pole-face covers 70% of the pitch \n",
"a = P #Number of parallel paths for Simplex lap-wound\n",
"\n",
"#Calculation\n",
"Z = conductors/P #Number of armature conductors/path under each pole\n",
"Z_a = Z*pitch #Active armature conductors/pole\n",
"Z_p = Z_a/a #Number of pole face conductors/pole \n",
"\n",
"#Result\n",
"print('Number of pole face conductors/pole , Z_p = %.1f or %.f conductors/pole' %(Z_p,Z_p))"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Number of pole face conductors/pole , Z_p = 5.6 or 6 conductors/pole\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 5.2, Page number 140"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Variable declaration\n",
"conductors = 800.0 #Number of conductors \n",
"I_a = 1000.0 #Rated armature current(A)\n",
"I_l = I_a #Load or total current entering the armature(A)\n",
"P = 10.0 #Number of poles\n",
"pitch = 0.7 #Pole-face covers 70% of the pitch \n",
"a = P #Number of parallel paths for Simplex lap-wound\n",
"alpha = 5.0 #Number of electrical degress that the brushes are shifted \n",
"\n",
"#Calculation\n",
"Z = conductors/P #Number of armature conductors/path under each pole\n",
"A_Z_per_pole = (Z*I_l)/(P*a) #Cross magnetizing ampere-conductors/pole\n",
"At_per_pole = (1.0/2)*(8000/1) #Ampere-turns/pole\n",
"frac_demag_At_per_pole = (2*alpha)/180*(At_per_pole) #Fraction of demagnetizing ampere-turns/pole\n",
"beta = 180-2*alpha #Cross-magnetizing electrical degrees\n",
"cross_mag_At_per_pole = (beta/180)*(At_per_pole) #Cross-magnetizing ampere-turns/pole\n",
"\n",
"#Result\n",
"print('(a) The cross-magnetizing ampere-conductors/pole = %.1f ampere-conductors/pole' %A_Z_per_pole)\n",
"print(' The cross-magnetizing ampere-turns/pole = %.1f At/pole' %At_per_pole)\n",
"print('(b) The fraction of demagnetizing ampere-turns/pole = %.1f At/pole' %frac_demag_At_per_pole)\n",
"print('(c) The cross-magnetizing ampere-turns/pole = %.f At/pole' %cross_mag_At_per_pole)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"(a) The cross-magnetizing ampere-conductors/pole = 800.0 ampere-conductors/pole\n",
" The cross-magnetizing ampere-turns/pole = 4000.0 At/pole\n",
"(b) The fraction of demagnetizing ampere-turns/pole = 222.2 At/pole\n",
"(c) The cross-magnetizing ampere-turns/pole = 3778 At/pole\n"
]
}
],
"prompt_number": 1
}
],
"metadata": {}
}
]
}
|
