Question: A 3 - Phase 4 4 0 V , 5 0 Hz , 1 1 0 Kw , 2 4 Poles, Star connection, 2 4

A 3-Phase 440V,50 Hz,110 Kw,24 Poles, Star connection, 245 rpm 3-phase slip ring Induction motor has a slip at maximum torque 6.5%. The resistance measured between pair of slip rings is 0.04 ohm. This motor drives a fan which requires 110 Kw at rated speed. What resistance should be connected in series with each slip ring so that the fan will run at 175 rpm? Neglect the stator impedance and the rotational losses.

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