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// FUNDAMENTALS OF ELECTICAL MACHINES
// M.A.SALAM
// NAROSA PUBLISHING HOUSE
// SECOND EDITION
// Chapter 7 : THREE-PHASE INDUCTION MOTOR
// Example : 7.4
clc;clear; // clears the console and command history
// Given data
f = 50 // frequency in Hz
P = 8 // number of poles
a = 0.03 // full load slip
R_2 = 0.01 // rotor resistance in ohm
X_2 = 0.1 // standstill resistance in ohm
// caclulations
N_s = 120*f/P // synchronous speed in rpm
s = R_2/X_2 // slip at maximum torque
N_l = (1-s)*N_s // rotor maximum speed in rpm
T = (2*a*s)/(s^2+a^2) // ratio of full load torque to maximum torque
T_ratio = 1/T // ratio of maximum torque to full load torque
// display the result
disp("Example 7.4 solution");
printf(" \n Rotor speed at maximum torque \n N_l = %.0f rpm \n", N_l);
printf(" \n Ratio of maximum torque to full load torque \n T_ratio = %.2f \n", T_ratio);
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