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   "source": [
    "# CHAPTER_8-Load Characteristics Of DC Motors"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Example 8.3 Page Dc-111"
   ]
  },
  {
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   "execution_count": 1,
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   "outputs": [
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     "name": "stdout",
     "output_type": "stream",
     "text": [
      "speed of motion at half the torque= 1444.17 rpm\n"
     ]
    }
   ],
   "source": [
    "import math\n",
    "\n",
    "#variable declaration\n",
    "U=230     #voltage(V)\n",
    "Ia1=155   #current(A)\n",
    "Rm_Rse=0.1#armature resistance(ohm)\n",
    "N1=1000  #speed(rpm)\n",
    "\n",
    "#calculation\n",
    "Ia2=round(Ia1/math.sqrt(2),1) #current(A)\n",
    "Eb1=U-(Ia1*Rm_Rse)   #voltage(V)\n",
    "Eb2=U-(Ia2*Rm_Rse)   #voltage(V)\n",
    "N2=(Eb2/Eb1)*(Ia1/Ia2)*N1\n",
    "print 'speed of motion at half the torque=',round(N2,2),'rpm'"
   ]
  }
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