Re: AC Generator Question. Current. vs Torque

Current and torque are directly related in AC motors. You typically do not “control” the current, but instead the current will naturally rise to the necessary level that is required to produce the applied load (torque).

AC induction motors are typically considered constant speed motors (or nearly so), because they synchronize with the AC power supply frequency and the resulting speed is product of this frequency and the number of poles in the motor.

When you start an AC induction motor, with no load (torque) applied, the speed will increase to the synchronous design speed, and the current draw will be low, only enough to overcome bearing resistance, air resistance and other internal motor losses. If you start to apply a load (torque) to the motor, the current will rise to provide the required torque, if you continue to apply additional loading (torque) you will reach the maximum allowable applied load (torque), and the maximum resulting current. Further increasing the load (torque) will cause the motor to slow down and overheat.

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