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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