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Homework Help: How to calculate open rotor voltage?

  1. Jun 13, 2015 #1
    1. The problem statement, all variables and given/known data
    The AC power supply is connected to the stator terminals of the induction motor and the dynamometer. The rotor terminals are left open. The AC power supply is then turned on.
    I need to find voltage between any two of the open rotor terminals.

    2. Relevant equations

    3. The attempt at a solution
    I measured this as 102.6V but I'm not sure if I measured correctly. Is there a way for me to calculate it instead?

    Attached Files:

  2. jcsd
  3. Jun 15, 2015 #2


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    Gold Member

    There probably is. Have you done much electromagnetic induction before?
  4. Jun 19, 2015 #3


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    Staff: Mentor

    The figures on the connector plate should be a clue to this. I'm having diffcuty reading it---does it show 120V per phase on the stator and 60V per phase on the rotor?

    You applied what voltage, and was this 3ɸ?

    Between what points did you measure the 102V?
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