Calculate the following:

A three-phase, 480 V, six-pole, Y-connected, 60 Hz, 10 kW induction motor is

driving a constant torque load of 60 Nm. The parameters of the motor are:





a. Motor torque.

b. Motor current

c. Starting torque

d. Starting current

A voltage is injected in the rotor circuit to reduce the motor speed by 40%.

e. Calculate the magnitude of the injected voltage.

f. Repeat (a) to (d) for the motor with injected voltage.

g. Calculate the power delivered to the source of injected voltage.

h. Determine the overall efficiency of the motor (ignore rotational and

core losses).




a. Motor Torque: Since this is a constant torque load, T = 60 Nm.

b. Since load did not change, speed must have changed. To find the new speed (or

slip), use the above parameters in the following equation.







h. Overall efficiency: Ignoring the rotational losses and the core losses.



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