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    Starting and maximum torque for wound rotor induction machine

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    A 3 phase, 50 Hz, 6 pole wound rotor induction machine has the following per phase parameters:

    Rs = Negligible
    Ls = 0.003 H
    Rr = 0.3 Ohm
    Lr = 0.002 H
    Lm = 0.1 H
    Rc = Infinity
    Ns/Nr = 1.2

    The voltage applied to each phase is 240 Vrms.

    Find: the starting torque,
    the maximum torque, and
    the speed at maximum torque.

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    Solution Summary

    Solution gives the basic formulas and equivalent circuit of induction motor in order to compute the answers.