Hysteresis motor
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This document discusses hysteresis motors. It describes the construction of hysteresis motors, which have a smooth cylinder rotor like induction motors but without windings. It explains that hysteresis motors operate based on the principle of a rotating stator flux inducing poles in the rotor that lag behind, causing it to accelerate to synchronous speed. The document also outlines the torque-speed characteristic of hysteresis motors, noting they can develop constant hysteresis torque independent of speed and frequency in their normal operating range.
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An electric motor converts electrical energy to mechanical energy through electromagnetic induction. It has a stationary stator and a rotating rotor. Induction motors are the most common type, having a squirrel cage rotor. When a three-phase current is applied to the stator, it creates a rotating magnetic field that induces currents in the rotor and causes it to turn, but at a slightly slower synchronous speed due to slip. The torque and power output can be varied by changing the supply frequency or voltage.More Related Content
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Hysteresis motors operate using the principle of hysteresis in the rotor material. The stator establishes rotating magnetic poles that induce magnetic poles in the smooth cylindrical rotor, which lags behind the rotating stator poles due to hysteresis. When the rotor is released, it accelerates to synchronous speed with the rotating magnetic field. Hysteresis motors can develop torque independently of frequency or speed up to synchronous speed due to the constant hysteresis power loss and developed mechanical power relationships. The rotor remains locked to the rotating stator poles with negligible losses at synchronous speed until an increase in shaft load causes the induced rotor poles to lag, but the rotor returns to synchronous speed once the new torque angle is reached.Eee ppt
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The document discusses the principles of operation of 3-phase induction motors. It explains that a 3-phase induction motor operates using a rotating magnetic field produced by a 3-phase AC current in the stator windings which causes the rotor to turn. The speed of the rotor is slightly less than the synchronous speed of the rotating magnetic field due to slip. The difference between the rotor speed and synchronous speed is used to produce torque. Torque-speed characteristics and power output equations for 3-phase induction motors are also presented.Unit8-Induction_Motor.ppteg bbcjfjkjfdjffjfb
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The document discusses the principles of operation of 3-phase induction motors. It explains that a 3-phase induction motor operates using a rotating magnetic field produced by a 3-phase AC current in the stator windings which causes the rotor to turn. As the rotor turns slightly slower than the rotating field, a slip is produced which generates an induced current in the rotor and produces torque. The torque causes the rotor to accelerate until the motor reaches its operating speed where the torque equals the load.UNIT-III-EV.pptx
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Hysteresis motor
- 1. Special Machines: Hysteresis Motors Construction Principle of Operation Power Flow Torque-Speed Characteristic Edited by: Engineer.Ahmed Amin Hassan Date : 1.10.2015
- 2. Hysteresis Motors Stator same as for induction motor Rotor Smooth cylinder
- 3. Principle of Operation Stator Flux establishes these magnetic poles Rotor poles induced by Stator Flux
- 4. Spin the stator poles with the rotor blocked Stator poles moving CCW Rotor poles follow the rotating flux, but lag behind by angle 隆h
- 5. Spin the stator poles with the rotor blocked If the rotor is released, it will accelerate to synchronous speed
- 6. Hysteresis Power Loss, Ph max n h h rP k f B where fr = frequency of flux reversal in the rotor (Hz) Bmax = maximum value of flux density in the air gap (T) Ph = heat-power loss due to hysteresis (W) kh = constant
- 7. Mechanical Power developed max max 1 1 5252 (1 ) mech h n h h nh r h r s r s s P P s P k f B T n s k f B s n n s f sf
- 8. Mechanical Power Developed (cont) max max 5252 120 5252 120 n h s h s s s n h h k f B T n f n P k B T P Independent of frequency and speed!
- 9. Hysteresis Motor at Synchronous Speed No load and negligible rotational losses Induced rotor magnets remain locked with the rotating poles produced by the stator
- 10. Hysteresis Motor at Synchronous Speed Apply a step increase in shaft load. The rotor slows down and the induced rotor magnets lag the rotating poles of the stator by an angle 隆mag . The rotor returns to synchronous speed at the new torque angle.
- 11. Hysteresis Motor at Synchronous Speed max sin( ) @ 90 mag mag mag mag T T occurs If shaft load causes 隆mag>90属, the rotor pulls out if synchronism, the magnet torque drops to zero, and the machine develops hysteresis torque. This torque is not sufficient to carry the load.
- 12. Torque-Speed Characteristic Normal Operating Range Constant Hysteresis Torque allows the motor to synchronize any load it can accelerate