Circuits & Systems II

Discussion in 'Homework Help' started by molsuk, May 12, 2008.

  1. molsuk

    Thread Starter New Member

    May 12, 2008
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    0
    hi my frinds,
    could anyone help me or give me the answer of this question plzzz

    A separately excited DC motor is shown in figure 5.0 below. It has R​
    A=2.3Ω and VT = 240V. For an output power of 2.5hp, nm = 1050rpm and IA = 10.1A. The field current remains constant at all times.



    [​IMG]

    a) Find the:
    i. Power developed,
    ii. Torque developed,
    iii. Power lost in R​
    A, and
    iv. The rotational losses

    b) Assuming that the rotational power loss is proportional to speed, find the no-load speed of the motor.

     
  2. molsuk

    Thread Starter New Member

    May 12, 2008
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    0
    plz help me
     
  3. thingmaker3

    Retired Moderator

    May 16, 2005
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  4. molsuk

    Thread Starter New Member

    May 12, 2008
    4
    0
    sorry
    i'll put my answer and i need ur help
     
  5. molsuk

    Thread Starter New Member

    May 12, 2008
    4
    0
    i get this answer
    for a)
    Pdev=2189.377W
    Tdev=19.911Nm
    PRa=234.623W
    Prot=324.377W
     
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