Dynamic characteristics of compound rotor system of mechanically rectified permanent magnet generator

机械整流永磁发电机复合转子系统的动态特性研究

Tianjin Key Laboratory of Modern Electromechanical Equipment Technology, Tiangong University, Tianjin 300387, China

Received: 27 May 2023

Abstract

The compound rotor system of a mechanically rectified permanent magnet generator is the key structure to realize the rectification function. The dynamics of the compound rotor system under bidirectional input conditions are studied to analyze the vibration deformation degree of each component of the rotor system and to ensure the uniform distribution of the shunt load of each planetary gear. In this paper, based on the theory of concentrated mass parameters, a dynamic model of the compound rotor system under the condition of bidirectional input is established. The model is solved with the Runge-Kutta numerical integration method. The dynamics of each component under the condition of bidirectional input are obtained. The results show that the oscillations of torsional displacement of each component of the compound rotor system are all about 25 μm, and the standard deviations of the meshing forces of each planetary shunt are all about 200 N during the two-way input, indicating that the vibration degree of the compound rotor system is similar; The load sharing coefficient of meshing forces decreases obviously with the increase of input torque and tends to be gentle when the torque reaches 500 N·m. Therefore, increasing the input torque can improve the dynamic meshing force and load sharing performance, so that the compound rotor system can obtain better dynamic performance under the bidirectional input condition. The research results are of great significance for the vibration and noise reduction and reliable operation of the permanent magnet generator.

摘要

机械整流永磁发电机的复合转子系统是该发电机实现整流功能的关键结构。研究该复合转子系统在双向输入工况下的动态特性, 是为了分析该转子系统各构件在双向输入工况下的振动变形程度。基于集中质量参数理论, 建立了复合转子系统在双向输入工况下的动力学模型, 通过龙格库塔法对该模型求解, 得到了其在双向输入时各构件的动态特性。结果表明: 复合转子系统各构件在双向输入时扭转振动位移波动幅值均在25 μm左右, 且各行星轮分路动态内外啮合力在双向输入时标准偏差均在200 N附近, 即复合转子系统产生的振动程度相近; 均载系数均随输入转矩增大而明显减小, 在转矩达到500 N·m时趋于平缓, 因此增大输入转矩能明显改善均载性能, 使复合转子系统在双向输入工况下获得较好的动力学性能。研究结果对该发电机的减振降噪和可靠运行有重要意义。