Analysis of inverter-fed high speed induction motor considering skew factor and crosspath resistance between adjacent rotor bars for wide speed range

The purpose of this work is to analyze and find out the effects of crosspath resistance between adjacent rotor bars, skew factor and skin effects on the rotor slot design of inverter-fed high speed cage induction motor driving for wide speed range. The performance of the induction motor drives for various values of crosspath resistance, and skew factor with the trapezoidal rotor bar is discussed on the basis of theoretical and simulation results of a 2.2 kW 500 Hz 15000 rpm three phase induction motor taking into account the skin effect of the rotor and the space harmonics. It is also shown that the equivalent rotor resistance and leakage reactance change with crosspath resistance between adjacent rotor bars, the harmonics, and the skew factor for various values of the fundamental supply frequency. In the paper, we also discuss the rotor slot-shape of the trapezoidal rotor slot for good efficiency and torque performance of the inverter-fed high speed cage induction motor for wide speed range.

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