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+// FUNDAMENTALS OF ELECTICAL MACHINES 

+// M.A.SALAM 

+// NAROSA PUBLISHING HOUSE 

+// SECOND EDITION

+

+// Chapter 11 : SINGLE-PHASE MOTORS

+// Example : 11.5

+

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

+

+// Given data

+f = 50      // supply frequency in Hz

+V_nl = 100  // no-load voltage in v

+I_nl = 2.5  // no-load current in A

+P_nl = 60   // no-load power in W

+

+V_br = 60    // Block rotor test voltage in v

+I_br = 3     // Block rotor test current in A

+P_br = 130   // Block rotor test  power in W

+R_1 = 2      // main windning resistance in ohm

+

+// caclulations

+Z_br = V_br/I_br                    // impedance due to blocked rotor test

+R_br = P_br/I_br^2                  // resistance due to blocked rotor test in ohm

+X_br = sqrt(Z_br^2-R_br^2)          // reactance under blocked condition in ohm

+X_1 = X_br/2                        // reactance in ohm X_1=X_2

+R_2 = R_br-R_1                      // resistance in ohm

+Z_nl = V_nl/I_nl                    // impedance due to no-load in ohm

+R_nl = P_nl/I_nl^2                  // resistance due to no-load in ohm

+X_nl = sqrt(Z_nl^2-R_nl^2)          // reactance due to no-load in ohm

+X_m =2*(X_nl-X_1-0.5*X_1)           // magnetizing reactance in ohm

+P_rot = P_nl-I_nl^2*(R_1+((R_2)/4)) // rotational loss in W

+

+// display the result  

+disp("Example 11.5 solution"); 

+printf(" \n Magnetizing reactance \n X_m = %.1f ohm \n", X_m );

+printf(" \n Rotational loss \n P_rot = %.0f W \n", P_rot );