5-7/4 A three-phase, eight-pole induction motor, rated at 847 r/min, 30 hp, 60 Hz,
460 V, operating at reduced load, has a shaft speed of 880 r/min. The combined stray power loss, windage loss, and friction loss is 350 W. The motor
parameters in ohms/phase are
$R_1 = 0.1891$
$X_1 = 1.338$
$R_2 = 0.191$
$X_2 = 0.5735$
$X_M = 14.18$
$R_{fe} = 189.1$
5-9/5 For the motor in Problem 5–7/4, determine (a) the shaft speed at maximum
torque; and (b) the value of the maximum torque.