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{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Chapter 5:Rating and Heating of Motors"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex5.1:pg-491"
]
},
{
"cell_type": "code",
"execution_count": 5,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"43.606211467 is The final temperature in deg\n"
]
}
],
"source": [
"#Electric Drives:concepts and applications by V.subrahmanyam\n",
"#Example:5.1\n",
"import math\n",
" \n",
"theta1=60;#Temperature rise of motor in degree\n",
"theta2=40.0;#Temperature rise of motor in degree\n",
"e=0.5;#exponential value\n",
"I1=110.0;#current in A\n",
"I2=125;#current in A\n",
"t1=4;#Time in hour\n",
"t2=8;#Time in hour\n",
"theta=theta1/theta2;\n",
"tough=-(1/math.log(0.5));\n",
"thetam1=theta2/e;\n",
"thetam2=thetam1*(I2/I1)**2;\n",
"x=t1/(theta1*tough);\n",
"a=math.e**-x;\n",
"y=t2/(theta1*tough);\n",
"b=math.e**-y;\n",
"thetam=I2*((1-a)/(1-(a*b)));\n",
"print thetam,\" is The final temperature in deg\"\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex5.2:pg-492"
]
},
{
"cell_type": "code",
"execution_count": 6,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"1.23972921698 is The permissible overloading \n"
]
}
],
"source": [
"#Electric Drives:concepts and applications by V.subrahmanyam\n",
"#Publisher:Tata McGraw-Hill \n",
"#Edition:Second \n",
"#Ex5_2\n",
"import math\n",
" \n",
"T=100.0;#Temperature rise of motor in degree\n",
"t1=2;#Time in hour\n",
"t2=1.5;#Time in hour\n",
"Alpha=0.5;#Angle in rad\n",
"e=math.e**(-t1/t2);\n",
"thetam=100.0/(1-e);\n",
"t=thetam/T;\n",
"x=math.sqrt((t*(Alpha+1))-Alpha);\n",
"print x,\" is The permissible overloading \"\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex5.3:pg-493"
]
},
{
"cell_type": "code",
"execution_count": 7,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"1.071304005 is The permissible overloading of the motor \n"
]
}
],
"source": [
"#Electric Drives:concepts and applications by V.subrahmanyam\n",
"#Publisher:Tata McGraw-Hill \n",
"#Edition:Second \n",
"#Ex5_3\n",
"import math\n",
" \n",
"Alpha=0.4;#Angle in rad\n",
"T1=100;#Temperature rise of motor in degree\n",
"T2=150.0;#Temperature rise of motor in degree\n",
"P=125.0;#Power in KW\n",
"t1=15;#Time in hour\n",
"t2=30.0;#Time in hour\n",
"x=-t1/T1;\n",
"a=math.e**x;\n",
"y=-t2/T2;\n",
"b=math.e**y;\n",
"p=math.sqrt(((Alpha+1)*(1-(a*b)))/(1-a)-Alpha);\n",
"print p,\"is The permissible overloading of the motor \"\n",
"\n"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 2",
"language": "python",
"name": "python2"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 2
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython2",
"version": "2.7.11"
}
},
"nbformat": 4,
"nbformat_minor": 0
}
|
