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Thread: Question about electro-magnetic motors

  1. 03-24-2009, 07:40 PM #1
    black roadster
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    Default Question about electro-magnetic motors

    I just restored a vintage box fan for my wife.

    In doing so I disassembled the electro-magnetic motor, cleaned it out with brake cleaner, electric contact cleaner, let it dry and then greased the moving parts with dielectric grease.

    Finally I rewired the switch and plug.

    The fans runs smoothly but also runs backwards. There is very little air coming out. I though I might have reversed my contacts. As a quick fix, I just flipped the non-polarized plug in the socket but that didn't do anything.

    Any ideas?

    Here is a schematic of whats going on.
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  2. 03-24-2009, 07:51 PM #2
    onething
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    The polarization of the magnetic field will determine the direction of rotation.

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    Last edited by onething; 03-24-2009 at 07:52 PM. Reason: speeling
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  3. 03-24-2009, 08:26 PM #3
    cone-cerned
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    Turn the fan around.
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    If you were as slow as me, you wouldn't be afraid either.

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  4. 03-24-2009, 08:41 PM #4
    sammm
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    Quote Originally Posted by cone-cerned View Post
    Turn the fan around.
    Or stand on the other side of it.
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  5. 03-24-2009, 08:45 PM #5
    Nails
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    Flipping the plug won't matter with AC. You somehow changed the polarization of the motor. Did you remove and clean magnets?
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  6. 03-24-2009, 09:23 PM #6
    black roadster
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    Quote Originally Posted by Nails View Post
    Flipping the plug won't matter with AC. You somehow changed the polarization of the motor. Did you remove and clean magnets?

    I removed the rotor but the magnets stayed in place. I may have assembled it sdrawkcab.
    ...and across the line.

    1996 Mazda Miata - R-Package (Eve-L)
     2012 Mazda CX-9 - Grand Touring (Dory)



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