edison123
Electrical
- Oct 23, 2002
- 4,443
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This apears to be a single motor rated for overspeed running on a VFD.Power is proportional to the product of speed and torque. As for electric motors torque is given by the rotor dimensions, lower speed motors have lower ratings.
The efficiency of motors typically improves with less than full load, peaking at around 75% of rated load.The highest efficiency at 2200 RPM debunks the theory that the motor is derated because of higher frequency loss in the motor.