Influence of stator and rotor geometric parameters on rotor bar current waveform and performance of IMs

Abstract

In this study, the influence of the stator and rotor geometric parameters on the rotor bar current waveform and performance characteristics of a squirrel-cage induction machine (IM), based on a slot/pole number combination (48-stator slot/8-pole/52-rotor slot), with the same winding layout, stator outer diameter, stack length, stator current, and rated speed as the Toyota Prius 2010 interior permanent magnet machine, is investigated. In order to reveal the individual influence of each parameter, parametric analyses have been conducted for each geometric parameter, and the corresponding variations of torque, torque ripple, power losses, and efficiency are numerically studied. It has been shown that in addition to rotor slot width, rotor slot depth, and stator slot width, corresponding to rotor tooth width, rotor tooth height, and stator tooth width, respectively, have a significant effect on the bar current waveform and performance characteristics while the slot opening widths have the least effect.

Keywords

• rotors
• torque
• permanent magnet machines
• squirrel cage motors
• finite element analysis
• stators
• performance characteristics
• squirrel-cage induction machine
• IM
• slot/pole number combination
• slot/8-pole/52-rotor
• stator outer diameter
• stator current
• Toyota Prius 2010 interior permanent magnet machine
• individual influence
• geometric parameter
• rotor slot width
• rotor slot depth
• stator slot width
• rotor tooth height
• stator tooth width
• slot opening widths
• rotor geometric parameters
• rotor bar current waveform