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  1. #46
    Join Date
    Jun 2008
    Location
    Victoria, Australia
    Age
    74
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    5,080

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    Quote Originally Posted by Michael G View Post
    Therefore the fan in a TEFC motor can not be a centrifugal fan. You win.

    Michael
    Hi Michael, In fairness to Chris, I think that was just a typo, as he has been saying the opposite all along..

    I'm willing to concede that a motor cooling fan uses a radial/centrifugal impellor. and leave it at that...

    Ray

  2. #47
    Join Date
    Jun 2011
    Location
    Australia east coast
    Age
    71
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    2,713

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    What does it matter if the cat is black or white, as long as it catches mice......

    PDW

  3. #48
    Join Date
    Dec 2014
    Location
    melbourne
    Posts
    72

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    Hello all, first post.

    Two things cause vibration from electric motors, first is out of balance of the rotating mass, unlikely at the normal speed of the motor,second is magnetic imbalance between the windings.
    Magnetic imbalance is more likely as there are many things that can cause it.
    A very simple way of finding out if this is likely and is only observable with belt drives is to watch the behavior of the belts when the motor is running. if the belt or belts are vibrating but stop vibrating when you switch off the motor and the revs drop then it indicates a high frequency speed variation per rev. Indication of magnetic imbalance.

    A site to read more: http://www.pdma.com/pdfs/Articles/Id...e_Analysis.pdf

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