Power supplied to induction motor

Discussion in 'General Electronics Chat' started by kokkie_d, Apr 1, 2011.

  1. kokkie_d

    Thread Starter Active Member

    Jan 12, 2009
    Hi, I got myself in a thinking tangent so I would like your fantastic minds to correct me if I am wrong.

    An induction motor (wye connected) is powered by 3phase 400Vrms line to line. It runs at its rated frequency of 3000 rpm. The current measured 440 mArms.

    The line to neutral voltage thus is: 400 / \sqrt{3} = 231\\
    The power per phase is thus: P = 231 * 440mA = 101.64 Watt \\
    For 3 phase power multiply by \sqrt{3}\\ = 176 Watt

    Is this correct, or am I forgetting the power factor? I need to know the power supplied.

    Additional info: Measured impedance (DC test) 33.4 Ohm and the measured phase between V1 and I1 = -118 degrees.

    Yes, I am doing the no-load and lock test to establish the parameters of an induction motor.