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{
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"cell_type": "markdown",
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"source": [
"# Chapter 7:Starting And Speed Control Of Induction Motor "
]
},
{
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"metadata": {},
"source": [
"## Example 7.1,Page 7-6"
]
},
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"text": [
"x= 0.7453\n",
"Thus 74.53 % tapping is required\n",
"Ist= 3.33 IF.L\n",
"Thus supply starting current is 3.33 times the full load current\n"
]
}
],
"source": [
"import math\n",
"\n",
"#variable declaration\n",
"Isc=6 # starting current at rated voltage(amp)\n",
"Sf=5 # full load slip\n",
"Tfl=Tst=1 # full load torque=starting torque(N-m)\n",
"Ifl=1 # full load current(amp)\n",
"\n",
"#calculation\n",
"x=math.sqrt((Tst/Tfl) * ((float(Ifl)/float(Isc))**2)*(1/(float(Sf)/100)))\n",
"print 'x=',str (x)[:6]\n",
"print 'Thus',str(x*100)[:5],'% tapping is required'\n",
"\n",
"#Ist(supply)=x**2 * 6\n",
"Ist=(x**2) * Isc # supply starting current(IF.L)\n",
"Ist=round(Ist,2)\n",
"print 'Ist=',Ist,'IF.L'\n",
"print 'Thus supply starting current is',Ist,'times the full load current'"
]
},
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