The machine operates in the regenerative braking mode as a wind energy generator. A gearbox of 5:1 speed ratio is between the machine and the turbine blades, with the high-speed side connected to the induction machine. If the wind speed exerts 200 Nm on the shaft of the blades, calculate the speed of the induction machine.
A 60 Hz, 480 V, three-phase, Y-connected, six-pole induction machine has the
following parameters:
60 Hz, 480 V, 3 phase, Y-connected, 6 poles
Twind = 200 Nm
Trotor = Twind/5 = 40 Nm
Assuming small slip,
Therefore,
N = 60*60/3*1.00218 = 1202.62 rpm
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