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  1. #16
    Join Date
    Oct 2011
    Location
    Norwood-ish, Adelaide
    Age
    55
    Posts
    5,622

    Default

    Is/was the motor running at 50Hz?
    If via a VFD, it may be that the air flow is not enough (I think air flow is related to rpm2). Just thinking that if the air flow was not enough to blow the heat way, the housing would get toasty and then melt the fan, lessening air flow more (and repeat).

    Michael

  2. #17
    Join Date
    Sep 2012
    Location
    North Yorkshire UK
    Posts
    4,104

    Default

    Hi Guys,

    I've seen something similar where the fan securing screw allowed the fan to migrate down the shaft to sit on top of the motor case, the heat melting the no longer rotating fan. I've also seen this with a metal cast fan, sat on top of the motor case.

    Those class "F" insulation motors are usually category "CR" continuously rated with a max temperature spec on the rating plate.
    Best Regards:
    Baron J.

  3. #18
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    61
    Posts
    4,563

    Default

    Motor running at what ever the house supply is, no VFD.

  4. #19
    Join Date
    Dec 2013
    Age
    53
    Posts
    907

    Default

    Sounds strange, I'd put a new fan on it and keep a check on it often.
    Do you have a digital thermometer to check it? There only cheap on eBay.

    I sometimes get some weird noises when I start mine or when it's running, I dont think there the best quality motor, one day I'll get around to fitting the new VFD motor I bought, lol
    Using Tapatalk

  5. #20
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    61
    Posts
    4,563

    Default

    Hello Dave, just waiting on a fan to arrive, not sure as to how long this issue had been present, noticed today that cast iron dust had settled on the surface of the melted remains of the fan and unable to remove it, so would appear that it possibly had been just sitting on top of motor for a while.
    No thermometer, but in past have just used my hand on the motor fins after prolonged use, normally hot.
    Tried the motor again this morning everything worked as normal with no unusual noises ( only ran for about 10 secs in for/Rev, test will be after the fan goes on.

  6. #21
    Join Date
    Dec 2013
    Age
    53
    Posts
    907

    Default

    Hopefully it's like you said and just cracked and worked it's way off
    Using Tapatalk

  7. #22
    Join Date
    Jun 2007
    Location
    sydney ( st marys )
    Age
    61
    Posts
    4,563

    Default

    New fan and hub fitted, motor seems okay at present.

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