What does the output power (Pout) in the efficiency formula for AC induction motors indicate?

The output power (Pout) in the efficiency formula for AC induction motors signifies the power that is actually delivered by the motor's shaft, expressed in watts. This is a critical metric as it reflects the useful work the motor can perform, distinct from the power supplied to the motor or the total power consumed. Efficiency is calculated as the ratio of output power to input power, demonstrating how effectively the motor converts electrical energy into mechanical energy.

By focusing on the power delivered by the motor's shaft, we gain insight into the motor's performance and capability in practical applications. This understanding is essential for optimizing motor usage, ensuring that the motor operates efficiently while delivering the necessary power for the intended task.