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E*clipse, when an induction motor is driven by its correct V/Hz ratio, the torque will remain constant and horsepower increases the faster you go, when the Hz moves beyond the maximum voltage, the motor is in what's refered to as "constant horsepower" mode because the RPM will increase but the torque decreases since the V/Hz ratio is not met.
It would be very easy to run a 240V 60Hz motor on 480V 120Hz have the same torque and double the horsepower!
Rick
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