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Thursday, July 11, 2013

Pitch factor problem

In a 4 pole, 3 phase alternator, armature has 36 slots. It is using an armature winding which is short pitched by one slot. Calculate its coil span factor.
Solution : 
       n = Slots/pole = 36/4 = 9
       β = 180o/ = 20o
       Now coil is shorted by 1 slot i.e. by 20o to full pitch distance.
...     α = Angle of short pitch = 20o
...      Kc = cos (α/2)  = cos (10)

              = 0.9848
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21 comments:

  1. UnknownDecember 9, 2015 at 10:02 AM

    thank you

    ReplyDelete
  2. UnknownJanuary 16, 2017 at 8:55 PM

    this is no pitch factor but coil factor

    ReplyDelete
  3. UnknownJanuary 29, 2017 at 11:07 AM

    Kc = cos (α/2) = cos (10) this line i din't get it how did u use 2

    ReplyDelete
  4. UnknownMarch 31, 2017 at 5:15 PM

    Cos(10) is -0.839 and not 0.9848

    ReplyDelete
    Replies
    1. SanthoshNovember 21, 2017 at 11:04 AM

      Change from deg to radians

      Delete
    2. UnknownMay 15, 2021 at 8:47 AM

      Your calculator needs to be set in degree to come up with 0.9848.

      Delete
  5. AnonymousApril 16, 2017 at 7:49 PM

    What calculator are you using?
    Its 0.984807753

    ReplyDelete
  6. UnknownOctober 4, 2017 at 6:09 PM

    I dont understand how to find alpha value plz explain.

    ReplyDelete
    Replies
    1. UnknownOctober 25, 2017 at 10:51 AM

      The alternator have 4 poles and 36 slots. So each pole will have 36/4= 9 slots under it.
      And u know 1 pole = angle of 180° electrica.
      So each slot angle= 180°/9 =20°.
      Now given armature winding is short pitched by one slot.
      So as alpha =shortpitch angle =20°.
      So Kp=cos(20°/2)= cos(10°)

      Delete
  7. UnknownOctober 4, 2017 at 6:09 PM

    I dont understand how to find alpha value plz explain.

    ReplyDelete
  8. murliFebruary 9, 2018 at 11:14 AM

    If short pitch by 2 slot then alfa is

    ReplyDelete
  9. AjeethDecember 7, 2018 at 3:05 AM

    How to find distribution factor for same problem?

    ReplyDelete
    Replies
    1. UnknownAugust 2, 2019 at 7:37 PM

      pitch factor and distribution factor to calculate....please

      Delete
  10. UnknownAugust 27, 2019 at 7:55 PM

    How

    ReplyDelete
  11. yadneshNovember 18, 2019 at 6:03 PM

    how to find distribution factor for same .

    ReplyDelete
  12. UnknownSeptember 11, 2020 at 10:36 PM

    How to find cos(alpha)'s value

    ReplyDelete
  13. UnknownMay 7, 2021 at 5:29 PM

    Thanks

    ReplyDelete
  14. Nines AllsMarch 9, 2022 at 1:29 AM

    forgot to consider the 3 phase

    ReplyDelete

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