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Hysteresis Motor

Published on 24/2/2012 & updated on 30/7/2018

What is Hysteresis Motor?

Hysteresis motor is defined as a synchronous motor that is having cylindrical rotor and works on hysteresis losses induced in the rotor of hardened steel with high retentivity. It is a single phase motor and its rotor is made of ferromagnetic material with non magnetic support over the shaft.

What is the Constructional Feature of Hysteresis Motor?

It consists of
  1. Stator
  2. Single phase stator winding
  3. Rotor
  4. Shaft
  5. Shading coil

hysteresis motor hysteresis motor

hysteresis motor

What is the Working Principle of Hysteresis Motor?

Starting behavior of a hysteresis motor is like a single phase induction motor and running behavior is same as a synchronous motor. Step by step its behavior can be realized in the working principle that is given below.
At the Starting Condition

At Steady State Running Condition

What is Hysteresis Power Loss, Ph in Hysteresis Motor?

Hysteresis power loss in the rotor of the hysteresis motor is given by Where, fr is the frequency of flux reversal in the rotor (Hz) Bmax is the maximum value of flux density in the air gap (T) Ph is the heat-power loss due to hysteresis (W) kh is the hysteresis constant

What is the Equation of Hysteresis Torque in the Hysteresis Motor?

From the equation of the hysteresis torque, it is clear that hysteresis torque is independent of frequency and speed.

What is the Torque-Speed Characteristic of Hysteresis Motor?

Torque-speed characteristics of hysteresis motor is given below. We know that constant Hysteresis Torque occurs in the hysteresis motor. This constant valued torque allows the motor to synchronize any load it can accelerate. The normal operating range is mentioned with dark vertical line. torque speed characteristic of hysteresis motor

What is the Speed-Torque Characteristics?

The speed-torque characteristics of a hysteresis motor is shown below. The torque is almost constant from starting to running condition. At starting condition the starting torque is the eddy current torque along with the hysteresis torque. But in the running condition net running torque means only the hysteresis torque. torque speed characteristic of hysteresis motor

What is the Starting Torque of the Hysteresis Motor?

Suppose ΦS is the stator flux at synchronous speed. Φr is the rotor flux. Due to hysteresis effect, Φr lags ΦS at an angle α. Then the starting torque produced is given by K is the proportional constant.

What are the Types of Hysteresis Motors?

There are various types of hysteresis motor by construction. They are
  1. Cylindrical hysteresis motors: It has cylindrical rotor.
  2. Disk hysteresis motors: It has annular ring shaped rotor.
  3. Circumferential-Field hysteresis motor: It has rotor supported by a ring of non magnetic material with zero magnetic permeability.
  4. Axial-Field hysteresis motor: It has rotor supported by a ring of magnetic material with infinite magnetic permeability.

What are the Advantages of Use of Hysteresis Motor?

The main advantages of hysteresis motor are given below.

What are the Disadvantages of use of Hysteresis Motor?

The disadvantages of hysteresis motor are given below.

What are the Applications of Hysteresis Motors?

They are widely used in
  1. Sound producing equipments,
  2. Sound recording instruments,
  3. High quality record players,
  4. Timing devices
  5. Electric clocks,
  6. Teleprinters.

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