##### Sunday, February 12, 2017

Assume that when you changed the frequency from 50 to 60 Hz that you mean the rated frequency but you then ran the motor at the same speed. By doing this you have altered the motor set up calculations that could have changed two items giving a different resistance.

The first is that the slip speed would be different that gives different equivalent rotor resistance values when referred to the stator. The equation is actual rotor resistance / slip. The other is that the skin effect f ...