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"# Chapter 7: Starting And Speed Control Of Induction Motor\n",
"\n",
"## Example 7.1, Page 7-6\n",
"\n",
"import math\n",
"\n",
"#variable declaration\n",
"\n",
"print 'starting current at rated voltage = Isc'\n",
"Isc=6 # Isc is 6 times its full load current(IF.L)\n",
"Sf=0.05 # full load slip=5%=5/100\n",
"print 'x = Tapping on autotransformer'\n",
"\n",
"#calculation\n",
"\n",
"#TF.L=Tst\n",
"#Tst/TF.L=x**2 * ([Isc/IF.L]**2) * Sf\n",
"#1=x**2[6/1]**2 * 0.05\n",
"#since TF.L=Tst, Tst/Tst=1\n",
"x=math.sqrt(((1.0/6.0)**2)*(1.0/0.05))\n",
"print 'x=',str (x)[:6]\n",
"print 'Thus',str(x*100)[:5],'% tapping is required'\n",
"#Thus 74.53% tapping is reqiured.\n",
"\n",
"#Now Ist(supply)=x * Ist(motor)\n",
"#Ist(supply)=x**2 * 6\n",
"Ist=(x**2) * 6 # supply starting current(IF.L)\n",
"Ist=round(Ist,2)\n",
"print 'Ist=',Ist,'IF.L'\n",
"\n",
"#result\n",
"\n",
"print 'Thus supply starting current is',Ist,'times the full load current'\n",
"#Thus Supply starting current is 3.33 times the full load current."
]
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