# A single-phase universal motor is operated with an AC source. The torque of the motor during the negative half cycle of the input current:

A single-phase universal motor is operated with an AC source. The torque of the motor during the negative half cycle of the input current:

### Right Answer is: Follows the same pattern of the torque caused by the positive half-cycle of the input current

#### SOLUTION

In a single-phase universal motor the torque of the motor during the negative half cycle of the input current follows the same pattern of the torque caused by the positive half-cycle of the input current.

When an AC voltage is applied, the direction of the current will alternate. Since the current reverses in both the rotor and stator at the same time, the magnetic fields around both windings also change simultaneously. The result is that the interaction of the two fields causes the direction of the developed torque to remain in the same direction. Therefore, the rotor turns one way, regardless of which direction the applied current flows.

Scroll to Top