The influence of the rotor slits on the performance of high-speed solid-rotor induction machine

摘要

Nowadays, the high speed induction motors with solid rotors are subject of interest in many studies. These machines are supplied from frequency inverters with corresponding frequency to obtain desire rotating speed. Very simple massive solid rotor is prefer due to its mechanical strength, low-cost manufacture and can be used in hostile environment. This article is focused on high speed induction motor with two different rotor types, namely smooth solid and axially slitted rotor. In the introduction the application, method of analysis and rotor topology are discussed especially for rotors, mentioned above. Our motor is designed to provide output power of 12kW and its synchronous speed is 45000 min-1. Models are created in ANSYS Maxwell software package and analyzed with approach of finite element method. Two solid rotors are examined where the first motor is equipped with smooth solid rotor which is made of single steel with no feature modification and can withstand great mechanical forces and the second motor is equipped with rotor where feature modification is applied in form of axial slits with proper depth in order to obtain better electromagnetic performance. The difference and improvement of this modification is investigated.