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  1. #1

    Post Questions about Relays

    Alsalamu 3alikom w ra7matuo allah wa barakatu
    Happy Eid Ad7a for all Muslims

    I just want to know the difference between DC and AC relays regarding the method of making fields

    i.e. we all know that AC current generates M.F. when it passes through Relay Coil but what for DC current? we all know that DC can't generate a field like AC does.

    So, please i need an answer

    Thanks,
    Eng. Karim


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  6. #2
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    Lightbulb

    they both have coil ,and depend on the magnetic field when current passes through,
    the difference (also in motors) is the way you make the coil,
    as the AC continuously changes,but for DC is same

    Hope i am right.

  7. #3
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    Default

    dc current generates a directional magnetic field so , the connections of these relays must be exact.while AC current will give bidirectional magnetic field , hence the torque developed in this case depends on the square of current و الله اعلم

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  9. #4
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    dear all
    i will reply hoping my reply maches to the requested engineer
    in dc current you know that their amagnetic filed generated in iron cor this play as permanent magnet that attract the two poles ,,,,,
    in the other side in ac relays we have aproblem that we cant have aconestant magnetic field so in ac contactors or relays their is two parted rings two made rectification to the ac magnetic field
    so in the end you have constsnt current , constant magnetic field to reach to the same purpose
    i hope my reply is ok
    if not please tell me the right
    thanks
    Eng- Mahmoud Elsherif

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