Induction motor

Forums Common electrical queries Induction motor

This topic contains 2 replies, has 2 voices, and was last updated by Profile photo of imran ahmed imran ahmed 11 months, 1 week ago.

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  • #1003 Reply
    Profile photo of imran ahmed
    imran ahmed
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    Can we start single phase/three phase induction machine with dc supply?  What will happen if we give dc supply to induction motor?

    #1008 Reply
    Profile photo of Kiran Daware
    Kiran Daware
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    How are you supposed to start an induction motor with a DC supply? For working of an induction motor, production of Rotating Magnetic Field in the field winding is necessary. This rotating magnetic field is produced due to alternating flux. Only an AC supply produces alternating flux, DC supply would only provide unidirectional flux. So, an Induction motor, either single phase or three phase, will not run on DC supply.

    What will happen when DC supply is applied to an induction motor?

    Remember, AC current sees resistance as well as reactance, i.e. impedance. So, when AC supply is provided to the winding of an induction motor, the AC current will be opposed by the winding impedance. But, if a DC source is applied, the DC current will only be opposed by the winding resistance only. And as you know, winding resistance is less than the winding impedance. Hence, for a DC supply, the amount of DC current flowing through the winding will be much higher which may damage the winding and/or motor.

    #1041 Reply
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    imran ahmed
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    Thank you… 🙂

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