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+// Calculating the main dimentions of squirrel cage induction motor

+clc;

+disp('Example 10.2, Page No. = 10.14')

+// Given Data

+P = 15;// Power rating (in kW)

+V = 400;// Voltage rating (in Volts)

+rpm = 2810;// r.p.m.

+f = 50;// Frequency (in Hz)

+e = 0.88;// Efficiency

+pf = 0.9;// Full load power factor

+ac = 25000;// Specific electrical loading (in A per meter)

+Bav = 0.5;// Specific magnetic loading (in Wb per meter square)

+Kw = 0.955;

+// the rotor peripheral speed is approximately 20 meter per second at synchronous speed

+// Calculation of the main dimentions of squirrel cage induction motor

+Q = P/(e*pf);// kVA input

+Co = 11*Kw*Bav*ac*10^(-3);// Output co-efficient

+ns = 3000/60;// Synchronous speed corresponding to 50 Hz (in r.p.s.)

+D2L = Q/(Co*ns);// Product of D^(2)*L

+D = 20/(%pi*ns);// Since the rotor diameter in an induction motor is almost equal to stator bore

+L = D2L/(D*D);

+disp('Main dimentions of squirrel cage induction motor')

+disp(D,'D (meter)=');

+disp(L,'L (meter)=');

+//in book answers are 0.1257 meter and 0.177 meter respectively.  The answers vary due to round off error