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Synchronous motor rattle

Discussion in 'Electronic Repair' started by N_Cook, Jun 3, 2009.

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  1. N_Cook

    N_Cook Guest

    Basic plastic ones ,as in day/week mains switch timer
    Anyone know the secret, other than going "electronic" ? I can see its not
    the anti-counter-rotation kicker moving about. Changing orientation makes no
    difference to the noise level or pattern.
     
  2. N_Cook

    N_Cook Guest

    onhttp://home.graffiti.net/diverse:graffiti.net/

    Add some medium-weight oil and see if that helps, or earplugs, if that
    is what you call them on the east side of the big ppond.

    ****8

    There was oil in there and I added some more, noise pattern has changed ,
    and reduced level of noise, so much better than it was.
    Seems to be shaded pole motor type , with small magnetised disk on a spindle
    but the 2 poles from the coil are not coplanar and the functioning seems to
    require axial movement of the disk, something to do with this non-planarity
    ? so not possible to take up axial wear, assuming basically a wear problem.
    Probably circumferential wear in the end bearing surfaces allowing a complex
    oscillatory movement to happen.
     
  3. N_Cook

    N_Cook Guest

    ,as in day/week mains switch timer
    onhttp://home.graffiti.net/diverse:graffiti.net/

    I have several similar timers and they all make some basic noise, even
    when brand new. I put them on a soft surface and that helps quiet the
    noise transmission down.

    *****

    I did not think , when it was open - add some foam/light rubber, between the
    motor and supports. Powering the motor outside the housing, holding in my
    fingers, it made no observable noise but you could feel vibration, but lay
    it on a surface of some sort and the noise was obvious. I doubt the
    vibration conducted through the drive pinion would be much.
     
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