· How do I calculate the power consumption for this? I'm not sure how the VFD affects this. Is there an efficiency or something for it that needs to be taken into account? Thanks! RE: Power calculation for 3 phase motor with VFD davidbeach (Electrical) 3 Nov 10 18:34. Fan curves should tell you the require horsepower at the different speeds. This will be the shaft power required of the motor ...
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