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Why induction motor is called as rotating transformer?

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it may be because rotating transformer also have one winding turns while the other remains stationary.because the one that was stationary is the one that accepts signals and the one that was turning is the one who converts he signal into current and distribute it to the motors engine
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as we know that a rotating magnetic field is created by the satator current,and so in the rotor there is induced current and there by the rotor developes a unidirectional torq

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as it works on induced voltage on rotor according to faradays law of electromagnetic inductio ac motors called as induction motor The AC motors works in the same principle as

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