稳态工况下电机-齿轮系统机电耦合动态特性研究

Study on Dynamic Characteristics of Electromechanical Coupling of Motor-gear System Under Steady State Conditions

针对由永磁同步电机和一级斜齿轮减速器组成的传动系统进行了研究。建立了永磁同步电机模型和一级斜齿轮动力学模型联合的机电耦合动力学模型。在施加恒定转速和恒定负载条件下,分析了机电耦合传动系统的电信号动态响应。通过研究,发现定子电流和电磁转矩含有反映齿轮啮合频率的信息,并且相比与电磁转矩,定子电流含有的传动系统频率信息更加丰富,这表明机械系统的频率会和电气系统中的定子电流和电磁转矩频率产生调制。证明电机的电气性能会受到机械系统特性的影响,研究结果为通过定子电流及其相关参数进行机电耦合系统的动态性能监测和故障诊断这一研究方法提供了参考,在此基础上,可以展开更深入的研究。

The transmission system composed of permanent magnet synchronous motor and first stage helical gear reducer is studied.The mechanical and electrical coupling dynamics model of permanent magnet synchronous motor(PMSM) and first-stage helical gear dynamics model is established.The dynamic response of electrical signal of electromechanical coupling transmission system is analyzed under constant speed and constant load.It is found that the stator current and electromagnetic torque contain information reflecting the gear meshing frequency,and the stator current contains more information about the transmission system frequency than the electromagnetic torque,which indicates that the frequency of the mechanical system will be modulated with the stator current and electromagnetic torque frequency of the electrical system.It is proved that the electrical performance of the motor is affected by the characteristics of the mechanical system.The research results provide a reference for the research method of dynamic performance monitoring and fault diagnosis of the electromechanical coupling system through the stator current and its related parameters.