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+// Electric Machinery and Transformers
+// Irving L kosow 
+// Prentice Hall of India
+// 2nd editiom
+
+// Chapter 9: POLYPHASE INDUCTION (ASYNCHRONOUS) DYNAMOS
+// Example 9-13
+
+clear; clc; close; // Clear the work space and console.
+
+// Given data as per Ex.9-10
+P = 4 ; // Number of poles in WRIM
+f = 60 ; // Frequency in Hz
+V = 220 ; // Line voltage in volt
+V_p = 220 ; // Phase voltage in volt (delta connection)
+hp_WRIM = 1 ; // Power rating of WRIM in hp
+S_r = 1740 ; // Full-load rated speed in rpm 
+R_r = 0.3 ; // rotor resistance per phase in ohm/phase 
+R_x = 0.7 ; // Added resistance in ohm/phase 
+X_lr = 1 ; // Locked rotor reactance in ohm
+
+// Calculations
+E_lr = V_p / 4 ; // Locked-rotor voltage per phase
+S = (120*f)/P ; // Speed in rpm of the rotating magnetic field
+
+// Total 3-phase rotor power input(RPI) in W
+P_in = 3 * ( (E_lr)^2 ) / ( (R_r)^2 + (X_lr)^2 ) * R_r ;
+
+T_s = 7.04 * (P_in/S); // Starting torque developed in lb-ft
+
+// Display the results
+disp("Example 9-13 Solution : ");
+
+printf(" \n P_in = %.f W \n",P_in);
+printf(" \n From Eq.(9-19),starting torque is : \n T_s = %.2f lb-ft",T_s);