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Sunday, February 11, 2024

Single Phase Machines| Rotating magnetic field & Synchronous Speed




 Single Phase Machines| Rotating magnetic field & Synchronous Speed


Single phase induction motors are the most widely used motors for home appliances. This lecture explains the working of a single phase induction motor.


The rotor of a single phase induction motor is generally a cage type rotor, similar to the one used in three phase induction motors. The stator has single phase windings which produce a pulsating but stationary stator magnetic field. The stator magnetic field can be decomposed into two rotating magnetic fields, one rotating in clockwise direction and the other rotating in counter-clockwise direction. The motor responds to both the components and overall torque-speed characteristics can be obtained by superposition of torque-speed characteristics by each rotating component.


The simple single phase induction motors suffer from two problems, firstly, these are not self-starting and secondly, there are high vibrations in the motors due to pulsating induced torque.




 Single Phase Machines| Rotating magnetic field & Synchronous Speed


Single phase induction motors are the most widely used motors for home appliances. This lecture explains the working of a single phase induction motor.


The rotor of a single phase induction motor is generally a cage type rotor, similar to the one used in three phase induction motors. The stator has single phase windings which produce a pulsating but stationary stator magnetic field. The stator magnetic field can be decomposed into two rotating magnetic fields, one rotating in clockwise direction and the other rotating in counter-clockwise direction. The motor responds to both the components and overall torque-speed characteristics can be obtained by superposition of torque-speed characteristics by each rotating component.


The simple single phase induction motors suffer from two problems, firstly, these are not self-starting and secondly, there are high vibrations in the motors due to pulsating induced torque.

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