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+// FUNDAMENTALS OF ELECTICAL MACHINES 
+// M.A.SALAM 
+// NAROSA PUBLISHING HOUSE 
+// SECOND EDITION
+
+// Chapter 11 : SINGLE-PHASE MOTORS
+// Example : 11.2
+
+clc;clear; // clears the console and command history 
+
+// Given data
+V_t = 220  // supply voltage in V
+R_1 = 6    // equivalent parameters of single phase induction motor in ohm
+R_2 = 6    // equivalent parameters of single phase induction motor in ohm
+X_1 = 10   // equivalent parameters of single phase induction motor in ohm
+X_2 = 10  // equivalent parameters of single phase induction motor in ohm
+N = 1500   // speed in rpm
+s = 0.03   // slip
+X_m = 150  // equivalent parameters of single phase induction motor in ohm
+
+// caclulations
+Z_f = 0.5*%i*X_m*((R_2/s)+%i*X_2)/((R_2/s)+%i*(X_2+X_m)) // impedance due to forward field in ohm
+R_f = real(Z_f) // from Z_f
+Z_b = 0.5*%i*X_m*((R_2/(2-s))+%i*X_2)/((R_2/(2-s))+%i*(X_2+X_m)) // impedance due to backward field in ohm
+R_b = real(Z_b) // from Z_b
+Z_t = R_1+%i*X_1+Z_f+Z_b // total impedence in ohm 
+I_1 = V_t/Z_t // input current in A
+P_d = (abs(I_1))^2*(R_f-R_b)*(1-s) // power developed in W
+T_d = 9.55*P_d/N // torque in N-m
+
+// display the result  
+disp("Example 11.2 solution"); 
+printf(" \n input current \n I_1 = %.2f<%.2f A \n", abs(I_1),atand(imag(I_1),real(I_1)));
+printf(" \n power developed \n P_d = %.2f \n", P_d );
+printf(" \n torque \n T_d = %.2f \n", T_d );
+printf("\n NOTE : ERROR : There is calculation mistake in Z_b in textbook. So there is change in answers from textbook")