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Starting and maximum torque for wound rotor induction machine

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.

Solution Summary

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