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Thread: cemf

  1. #1
    Join Date
    Apr 2003
    Location
    New York
    Posts
    700
    Hi everyone ,
    I dont fully understand counter electromagnetic force , can u guys explain its concept and how it works.Thanks in advance for any replies.


  2. #2
    Join Date
    Dec 2003
    Location
    45th Parallel
    Posts
    954
    When you appply voltage to a motor you cause current to flow in the windings. This current flow create a magnetic field which then causes an induced current flow in the Rotor. This rotor current also has a magnetic field that opposes the one created in the windings. They are out of phase. This is what allows a motor to run properly without over-amping. That CEMF is not fully created yet till motor gets up to speed so that is why you see LRA at instant of start-up.

    There is actually a very large amount of current flowing in Rotors, and a lot of heat generated.
    Hope that helps, wasn't very technical. You can go to the textbooks for the technical stuff.

    [Edited by drivewizard on 04-17-2005 at 01:20 PM]

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