Find the starting torque, the maximum torque, and the speed at maximum torque for a 3 phase, 50 Hz, 6 pole 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.

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