Transformer

Discussion in 'General Electronics Chat' started by smartelectro, Mar 3, 2011.

  1. smartelectro

    Thread Starter New Member

    Mar 3, 2011
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    I am a Mechanical Engineer trying to learn practical electronics to prop up my interest in Mechatronics. To enhance personal safety I recently had an isolation transformer constructed by a local transformer manufacturer. I have a question and would be grateful for an answer.

    When I switch on the transformer, sometimes I hear a distinct hum and at other times it is absolutely silent. Why does this happen? Is there some problem with the core? Can someone help me understand this phenomenon.
     
  2. marshallf3

    Well-Known Member

    Jul 26, 2010
    2,358
    201
    Try varying the load to see if there's any difference.
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    The hum is inefficiencies, usually no big deal. It is just the electromagnetic field wiggling something that isn't as tight as it could be.
     
  4. PackratKing

    Well-Known Member

    Jul 13, 2008
    850
    215
    That being the case, it may be a good idea to infuse the coils / laminations with a good grade of varnish in order to stabilize them, erstwhile they will eventually fail. Kind of surprised that your Mfgr. was not certain to do this for you.
     
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