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+// FUNDAMENTALS OF ELECTICAL MACHINES 

+// M.A.SALAM 

+// NAROSA PUBLISHING HOUSE 

+// SECOND EDITION

+

+// Chapter 10 : SYNCHRONOUS MOTOR

+// Example : 10.3

+

+clc;clear; // clears the console and command history 

+

+// Given data

+V = 440          // supply voltage in V

+R_a = 1.5        // per phase resistance in ohm

+X_a = 8          // syncronous reactance in ohm

+P = 4            // number of poles

+f = 50           // supply frequency in Hz

+pf = 0.9         // leading power factor

+I_a = 50         // armature current in A

+

+// caclulations

+V_t = V/sqrt(3)      // terminal voltage per phase in V

+phi = acosd(pf)      // angle in degree

+Z_s = R_a+%i*X_a     // impedance per phase ohm

+E_r = I_a*abs(Z_s)        // resultant voltage due to impedance in V

+bet = atand(X_a/R_a)

+E_f = sqrt(V_t^2+E_r^2-2*V_t*E_r*cosd(bet+phi)) // excitation voltage per phase in V

+P_dm = (((E_f*V_t)/Z_s)-((E_f^2*R_a)/Z_s^2))          // maximum power per phase in W

+

+// display the result  

+disp("Example 10.3 solution"); 

+printf(" \n Maximum power per phase \n P_dm = %.2f W \n", P_dm );

+printf(" \n In textbook solution they took E_f = 513.5V instead of 533.33V");