Rotor reactance induction motor

Discussion in 'Homework Help' started by W.W, Jan 5, 2013.

  1. W.W

    Thread Starter New Member

    Jan 5, 2013

    I'm stuck with my homework. Hope one of you can help me.

    A star-connected, three-phase, 230 V, 200 Hz, 10 kW induction motor is used and rotates with a mechanical speed of 1100 rpm at rated power and frequency. The phase current is 36.5 A. The friction torque, TFW, is equal to 2 Nm (independent of the speed). The following parameters of the induction motor are given: R2' = 0.2 Ω, X1 = 0.55 Ω. The core losses are 100 W. At rated condition the motor has an efficiency of 86 %.

    I managed to compute the stator resistance (R1 = 0.09 Ω) and the rotor current (I2' = 39.4 A) but how do I calculate the rotor reactance, X2'?

    The standard procedure is to calculate the parameters with a no load and blocked rotor test but I don't have these values.

    Thans in advance.