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  • Users: SevenToFive
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  1. S

    How to calculate power using amps drawn?

    Is there a formula that I can use to calculate the HP a motor is actually making if all I have is amp draw? I am trying to size a gearbox, but the customer has no idea what torque is needed. All they know is the motor is drawing 5 amps when it spikes and 3.5 amps when it is running. I am...
  2. S

    Motors and VFD's

    How does one calculate the amount of HP a motor makes when it is not running at a full 60Hz? The reason for my asking is a customer wants to use a 1/4HP motor and a gearbox to vary the speed of a conveyor. At a full 60Hz we are figuring 1750rpm for the motor, and through the 7:1 gearbox the...