Question

What is the condition for the steady-state operation of the motor?

(a) Load torque > Motor torque

(b) Load torque <<<< Motor torque

(c) Load torque = Motor torque

(d) Load torque < Motor torque

This question was posed to me in exam.

This is a very interesting question from Dynamics in chapter Dynamics of Electrical Drives of Electric Drives

Answer 1

The correct option is (c) Load torque = Motor torque

Best explanation: According to the dynamic equation of motor, load torque must be equal to motor torque so that motor should run at a uniform speed. If load torque is greater than motor torque, the motor will fail to start and if load torque is less than motor torque, the motor will run at a higher speed which can damage the shaft of the motor.