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HYSTERESIS MOTOR
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- 2. CONTENTS INTRODUCTION CONSTRUCTION WORKING PRINCIPLE ANDOPERATION T- N CHARACTERISTICS TYPES OF HYSTERESIS MOTORS ADVANTAGES DISADVANTAGES APPLICATIONS
- 3. INTRODUCTION • It IsA Synchronous Motor With Uniform Air Gap, Without Dc Excitation • It Operates On Both 1Ø And 3ØSupply • 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. It has twowindings Main winding Auxiliary winding It designed to produce rotating magnetic field from 1Ø supply STATOR
- 5. ROTOR the coreof 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
- 8. starting behaviorof a hysteresis motor is like 1Ø induction running behavior is same a synchronous motor
- 9. when thesupply 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
- 10. AT THE RUNNING CONDITION • Whenthe 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
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- 12. 1. CYLINDRICAL TYPE( cylindrical rotor) 2. DISC TYPE (angular disc shaped rotor) 3. CIRCUMFERENTIAL – FIELD TYPE ( rotor is supported by ring of non magnetic materials with zero permeability ) 4. AXIAL – FIELD TYPE (rotor is supported by ring of non magnetic materials with infinite permeability)
- 14. There isno 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
- 15. output powerpoor Low efficiency Low power factor Low torque Size of the motor is available in very small
- 16. Sound producing equipment's Soundrecording instruments High quality record players Time devices Electric clocks Tele printers
- 17. This Photo byUnknown Author is licensed under CC BY