transformer coil polarity with an even number of layers?

Discussion in 'General Electronics Chat' started by electronice123, Jul 16, 2014.

  1. electronice123

    Thread Starter Senior Member

    Oct 10, 2008
    302
    0
    How do you determine the polarity of a secondary coil of a transformer if the coil has an even number of layers (beginning and end of the coil are in the same side)?
     
  2. alfacliff

    Well-Known Member

    Dec 13, 2013
    2,449
    428
    its the same as with an odd number.
     
  3. crutschow

    Expert

    Mar 14, 2008
    12,991
    3,227
    Transformer polarity is unaffected by whether the number of layers or windings is even or odd.

    To determine the polarity, you can apply a momentary low voltage pulse, such as from a battery, to the primary winding and observe the pulse polarity of the secondary.
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,509
    2,369
    Turns can also be directly on top of one another, i.e. Planar wound also.
    Max
     
  5. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    5,435
    1,305
    It depends on the direction of the windings compared to each other, and the location (top/bottom) of the start and ends of each coil compared to each other.

    Personally I like Crutschow's suggestion. If the transformer is used on AC the polarity doesn't matter. And if used on DC/SMPS etc just put it in circuit and look on the 'scope.
     
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