DC-Shunt Motor

Discussion in 'Homework Help' started by Zanac-X, Mar 31, 2012.

  1. Zanac-X

    Thread Starter Member

    Dec 23, 2011
    51
    1
    hey guys:

    i have this problem that i cant solve

    Q/ 250V,15KW shunt motor has a total armature resistance of 0.5 ohm and fiend resistance of 125 ohm . if it takes a current of 5A at no-load find :

    1- input current and efficiency at full-load
    2- maximum efficiency and its input current

    any help is much appreciated

    thanks
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
  3. Zanac-X

    Thread Starter Member

    Dec 23, 2011
    51
    1
    thanks for the links but i already know these formulas all that is stopping me is a relationship between input current in no-load and full-load

    here is the answers :

    1- I=75.9 A , efficiency =79%
    2-I=51.9 A , efficiency =80.8%
     
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