How to Calculate Shaft Torque in a One-Phase Induction Motor

What is the formula to calculate the shaft torque in a one-phase induction motor?

How can we find the shaft torque when given the gross power absorbed by the forward and backward fields, frequency, speed, and frictional losses?

Calculating Shaft Torque in a One-Phase Induction Motor

In a one-phase induction motor, the shaft torque can be calculated using the formula T = K × P_out / f, where T is the shaft torque, K is a constant, P_out is the output power of the motor, and f is the frequency.

When calculating the shaft torque in a one-phase induction motor, we need to consider various factors such as the gross power absorbed by the forward and backward fields, frequency, speed, and frictional losses. By using the formula T = K × P_out / f, we can determine the shaft torque accurately.

Firstly, we calculate the total power absorbed by the motor which is the sum of the power absorbed by the forward and backward fields. Then, we subtract the no-load frictional losses to find the output power of the motor. Next, we calculate the angular velocity using the formula ω = 2πn/60, where n is the speed of the motor in rpm. The constant K is typically equal to 1 for a one-phase induction motor.

Substitute the given values into the formula T = K × P_out / f to determine the shaft torque. In this case, the shaft torque is found to be 2.5 Nm based on the provided data. By following these steps, you can accurately calculate the shaft torque in a one-phase induction motor.