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AC motors starting torque

Discussion in 'Homework Help' started by sonic seven, May 6, 2009.

  1. sonic seven

    sonic seven New Member

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    Hi, question is for my industrial electronics course. A 4-pole 460v motor has a starting torque of 200lb/ft. Predict it's starting torque if EL is reduced by 10%.(EL=line voltage). Should this be solved as a proportion? thank you.
     
    Last edited by a moderator: May 8, 2009
  2. ecerfoglio

    ecerfoglio New Member

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    Jul 5, 2007
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    Location:
    Buenos Aires
    If EL is reduced by 10% the starting torque will be reduced... But not by 10 %

    You may think the torque as power divided by speed ....

    You may think power as voltage times current ....

    You may think current as voltage divided by impedance ...

    With theese hints you should be able to find the answer by yourself
     

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