高速异步电动机转轴的疲劳特性分析

基于Ansys多物理场仿真软件平台,对高速异步电动机的转轴进行疲劳特性分析,校核高速异步电动机转轴的疲劳强度和高速运行的可靠性,预测电机转轴的寿命;分析电磁力对转轴疲劳寿命的影响,判断疲劳特性的类型。对比分析作用于电机结构的电磁力波频率、幅值和电机转轴各阶模态的固有频率,校核电机转轴的强度。在转轴不会因电磁振动发生断裂的前提下,将电磁力等效为静应力分析转轴的疲劳特性,校核电机轴在电机寿命周期内是否会发生短周疲劳损坏；并采用凹圆角设计进一步提高转轴的结构可靠性,提高电机的转轴寿命。

Fatigue Characteristic Analysis of the Shaft of High Speed Induction Motor

Based on the ANSYS multi field simulation software platform, the fatigue characteristic analysis of the shaft of the high speed induction motor was carried out. The fatigue strength and the reliability of high speed operation of the high speed induction motor shaft are checked. And the life of the motor shaft is predicted. The influence of the electromagnetic force on the fatigue life of the shaft is analyzed. And the type of the fatigue characteristic is judged. The frequency and amplitude of the electromagnetic force acting on the motor structure and the natural frequency of each order of the motor shaft are compared and analyzed. And the strength of the motor shaft is checked. When the shaft does not break due to the electromagnetic vibration, the electromagnetic force is equivalent to the static stress. And the fatigue characteristic of the shaft is analyzed. Whether the motor shaft occurs the short cycle fatigue damage during the life cycle of the motor is checked. The concave fillet design is adopted to further improve the structure reliability of the shaft and the shaft life of the motor.