Which of the follwing motors has a squirrelcage rotor that h

Which of the follwing motors has a squirrel-cage rotor that has been modified with notches, flats, and barrier slots? a. Hysteresis b. Reluctance C. Split PHase d. Stepper

Solution

If a conventional squirrel-cage rotor has flats ground on it to create salient poles and increase reluctance, it will start conventionally, but will run synchronously, although it can provide only a modest torque at synchronous speed. This is known as a reluctance motor.

Because inertia makes it difficult to instantly accelerate the rotor from stopped to synchronous speed, these motors normally require some sort of special feature to get started. Some include a squirrel-cage structure to bring the rotor close to synchronous speed.