HYSTERESIS MOTOR

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1. HYSTERESIS MOTOR - SUNDARRAJ R

2. CONTENTS

3. INTRODUCTION It Is A Synchronous Motor With Uniform Air Gap, Without Dc Excitation It Operates On Both 1Ø And 3Ø Supply Torque Is Produced Due To Hysteresis And Eddy Current Induced In The Rotor By The Action Of Rotating Flux Of The Stator Windings At the starting condition 1Ø induction motor , at the running condition synchronous motor

4. CONSTRUCTION

5. ROTOR the core of rotor made up non magnetic materials many thin rings are forms hysteresis rings to avoid eddy current loss Hysteresis rings are made up of hard chrome or cobalt steel hence there is no windings in rotor Non-magnetic materials

6. HYSTERESIS LOOP

7. EQUATIONS OF EDDY CURRENT LOSS AND HYSTERESIS LOSS

8. starting behavior of a hysteresis motor is like 1Ø induction running behavior is same a synchronous motor WORKING PRINCIPLE OF HYSTERESIS MOTOR

9. when the supply is given to the stator , revolving magnetic field is produced in stator to maintain the rotating magnetic field the main and auxiliary windings must be supplied continuously at start as well as in running conditions by phenomenon of induction , secondary voltage is induced in the rotor by revolving magnetic field . Hence eddy current is generates in rotor due to eddy current , the eddy current torque is occurs in rotor AT THE STARTING CONDITION

10. AT THE RUNNING CONDITION When the rotor reaches synchronous speed, the stator pulls rotor into synchronism At the condition of synchronism , the relative motion b/w stator field and rotor field vanishes Hence no induction phenomenon to continue Thus the torque due to eddy-current vanishes

11. TORQUE- SPEED CHARACTERISTICS

12. CYLINDRICAL TYPE ( cylindrical rotor) DISC TYPE (angular disc shaped rotor) CIRCUMFERENTIAL – FIELD TYPE ( rotor is supported by ring of non magnetic materials with zero permeability ) AXIAL – FIELD TYPE (rotor is supported by ring of non magnetic materials with infinite permeability) TYPES OF HYSTERESIS MOTORS

13. There is no winding in rotor, hence no mechanical vibrations takes place in this operation The Operation is quiet and noiseless why because no vibration It suitable for accelerate inertia loads ADVANTAGES

14. output power poor Low efficiency Low power factor Low torque Size of the motor is available in very small DISADVANTAGES

15. APPLICATIONS

16. This Photo by Unknown Author is licensed under CC BY