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Homework Help: How to calculate the resistance of a lap wound armature?

  1. Jul 25, 2017 #1
    1. The problem statement, all variables and given/known data

    A 4 pole lap wound armature has 16 coils, each with a resistance of 0.1 ohms. Calculate the resistance of the armature?
    2. Relevant equations

    3. The attempt at a solution
    Hi there fellow members,

    I'm currently doing a section of my course which deals with Electrical machines. The lesson that I am on at the moment is dealing with Armature windings ( lap and wave ).

    There are two diagrams in the lesson but they are confusing.

    One leads me to think that the total resistance would be 16*.01 ='s 1.6 ohms

    The other one leads me to think that there are 4 parallel paths. 4*4 = 16

    4*0.1=0.4 so total resistance is

    1/R = (1/0.4)*4

    R = 1/10

    R = 0.1 ohms

    With the fact that it's a question being asked I would think that the 1.6 is a bit straight forward so I'm leaning towards the 0.1 ohms answer.

    Any help/suggestions would be greatly appreciated :)


    P.S Thanks for taking the time to read the question!
  2. jcsd
  3. Jul 25, 2017 #2


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    Homework Helper
    Gold Member

    That's correct.
  4. Jul 25, 2017 #3
    Thanks cnh1995 :)

    Do you mind if I ask why we have 4 parallel paths? Is this standard for a 4 pole lap wound armature? Having the answer is good but understanding why is the best thing and my lesson notes are fairly unclear, to say the least!
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