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A three-phase, 60-Hz, 4-pole, 440-V (line-line, rms) induction-motor drive has a full-load (rated) speed of 1746...

A three-phase, 60-Hz, 4-pole, 440-V (line-line, rms) induction-motor drive has a full-load
(rated) speed of 1746 rpm. The rated torque is 40 Nm. Keeping the air gap flux-density
peak constant at its rated value.

The frequency and voltage of the motor from above are adjusted such that the fan speed is changed to 600 rpm. The motor should be operating at 3% slip and rated Bm. What is the motor efficiency?

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