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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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