Hysteresis motor
Schrage motor
Universal motor
Reluctance motor
Answer is Right!
Answer is Wrong!
The correct answer is: A. Hysteresis motor
A hysteresis motor is an AC electric motor that uses hysteresis to store energy in the rotor. The rotor is made of a ferromagnetic material that has a high permeability. When the stator windings are energized, a magnetic field is created. The rotor aligns itself with the magnetic field, and the magnetic field induces an electric current in the rotor. The current creates its own magnetic field, which opposes the stator field. This interaction creates a torque that drives the motor.
Hysteresis motors are used in a variety of applications, including fans, blowers, and pumps. They are also used in some types of servomotors.
The other options are incorrect because:
- A Schrage motor is a type of synchronous motor that uses a wound rotor. It is not used for unity power factor.
- A universal motor is a type of AC motor that can be operated on either AC or DC power. It is not used for unity power factor.
- A reluctance motor is a type of AC motor that uses the reluctance of the magnetic material in the rotor to create torque. It is not used for unity power factor.