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There basically 2 types of induction motor depending upon the type of input supply – (i) Single phase induction motor and (ii) Three phase induction motor.
Basic Working Principle Of An Induction Motor
- Alternating flux is produced around the stator winding due to AC supply. This alternating flux revolves with synchronous speed. The revolving flux is called as “Rotating Magnetic Field” (RMF).
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The relative speed between stator RMF and rotor conductors causes an induced emf in the rotor conductors, according to the Faraday’s law of electromagnetic induction. The rotor conductors are short circuited, and hence rotor current is produced due to induced emf. That is why such motors are called as induction motors.(This action is same as that occurs in transformers, hence induction motors can be called as rotating transformers.)
- Now, induced current in rotor will also produce alternating flux around it. This rotor flux lags behind the stator flux. The direction of induced rotor current, according to Lenz’s law, is such that it will tend to oppose the cause of its production.
- As the cause of production of rotor current is the relative velocity between rotating stator flux and the rotor, the rotor will try to catch up with the stator RMF. Thus the rotor rotates in the same direction as that of stator flux to minimize the relative velocity. However, the rotor never succeeds in catching up the synchronous speed. This is the basic working principle of induction motor of either type, single phase of 3 phase.
Synchronous Speed:
Slip:
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