Need help calculating full load power

Discussion in 'General Electronics Chat' started by jhburch, Oct 24, 2008.

  1. jhburch

    Thread Starter New Member

    Oct 24, 2008
    I need to calculate the motor nameplate full load power of a 3 phase delta connected motor in order to set up a new power monitor. These are the specs I have:

    HP (full load): 20
    Amps (full load): 22.3
    motor nameplate voltage: 460
    motor nameplate hertz: 60
    Control volts from transformer between motor & power phases: 110 VAC
    RPM: 3520
    RPM (full load): 3519
    Power Factor (full load): 91.7%
    Efficiency (full load): 91.7
    Full Load Torque: 100%, 29.8 lb.-ft.
    Duty: Continuous
    Stator Res. @ 25 deg C (between lines): .521 Ohms
  2. mik3

    Senior Member

    Feb 4, 2008
    Convert HP into watts and then multiply then divide them by the efficiency (but in 0.917 form and not in percent form) to get the active power delivered to the motor from the power supply.