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What is basic difference between a three phase induction motor and a transformer?
Wiki User
∙ 10y ago
A Transformers main function is to change one voltage to another voltage. A motors main function is to relieve man of tedious and repetitive work and also work that man has not the strength to do alone.
Another AnswerAlthough, as outlined in the first answer, they have completely different functions transformers and induction motors do in fact have certain similarities.
They each have a primary winding and a secondary winding (although, in the case of the motor, they are termed the 'field winding' and the 'rotor winding'), and voltages are induced into the motor's rotor winding by 'transformer action'.
The main difference, of course, is that the motor's 'secondary winding' (the rotor) is not fixed, but rotates. This means that the frequency of the currents in the rotor change as the rotor's speed changes: being equal to that of the 'primary winding' (field winding) at standstill, but reducing as the rotor speeds up and approaches synchronous speed. Mathematically, both are treated in a very similar manner, with their equivalent circuits being practically identical, although the 'no load' current (i.e. when the rotor is stationary) of a motor is significantly higher than a transformer's due to the much higher leakage reactance caused by the air gap between the stator and the rotor.
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∙ 10y ago
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