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Determine the total of windage and friction losses the no

A four-pole, star-connected, squirrel-cage induction motor operates from a variable voltage 50 Hz three-phase supply.

The following results were obtained as the supply voltage was gradually reduced with the motor running on no-load.

Stator line voltage 220 164 112 88 42

Stator line current (amperes) 6.8 5.4 3.9 3.8 3.7

Stator power (watts) 470 360 278 244 232

(a) By plotting a suitable graph from these results, determine the total of windage and friction losses, the no load magnetising current Io (assume no load current I_o is magnetising losses) and the equivalent circuit magnetising circuit parameters R_o and X_o.

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