Effects of an Odd Number of Rotor Slits on the Torque Ripple, Rotor Losses and Unbalanced Magnetic Pull of a High-Speed, High-Power, Solid-Rotor Induction Motor

摘要

The effects of an odd number of the rotor slits on the torque ripple, resistive rotor losses and unbalanced magnetic pull of a high-speed, high-power, solid-rotor induction motor are studied numerically by applying two-dimensional finite element analysis. The theoretical background on the selection of the rotor slit number in the case of a two-pole motor with 48 stator slots is presented. The study shows that the torque ripple of the motor is considerably smaller when the number of the rotor slits is selected to be an odd number. It is also shown that the unbalanced magnetic pull between the stator and the rotor depends strongly on the rotor slit number and the loading of the motor.