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Thread: transformer hum

  1. #1
    kra
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    transformer hum

    I have built a 48 volt power supply that seems to work ok but it hums and vibrates a lot when I install an enclosure
    I have let it run for a couple of hours and everything seems ok
    (microwave transformer rewound with #14 magnet wire)
    Is there a way to controll this humming an vibration?
    (leaving the cover off helps but this holds the cooling fan)
    thanks,
    Randy


  2. #2
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    That is one of the problems with unpotted (or unimpregnated) transformers. You could try potting it...or just mount it on rubber groumets.


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    Is the cover made out of steel or aluminum? If steel, the transformer could have a strong enough magnetic field to cause the cover to resonate at 60 hz. Also could be a loose lamination in the core causing noise and the cover amplifies it.


  4. #4
    Community Moderator Al_The_Man's Avatar
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    If it is a square laminated transformer, they usually are dipped and baked in shellac. Another way, if you have a MIG welder is to run a narrow bead across the laminations on either side, this is also a common practice by some manufacturers.
    Al
    CNC, Mechatronics Integration and Custom Machine Design (Skype Avail).

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.


  • #5
    kra
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    thanks for suggestions
    the core is welded across already and the housing is sheet steel
    also the core is shellacked
    i will try an aluminum cover and the rubber spacers
    thanks
    Randy


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