电机传动机构动力学建模、仿真与实验验证

Dynamic modeling,simulation and test verification for a drive mechanism of a generator

建立正确的电机动力学模型是分析系统稳定性和动态特性的基础。考虑到用电设备工作时的脉冲电流是发电机传动机构扭转振动的主要激励源,利用集中参数法建立了某型交流发电机的动力学模型,并在MATLAB环境下对其进行动态仿真分析,得到脉冲电流作用下弹性轴冲击扭转振动的力矩曲线与扭转角曲线。通过对仿真结果的对比分析,发现适当增大弹性轴的轴径,可以有效缓解弹性轴扭转力矩的振动峰值,并提高系统的频率裕度。最后,通过动态测试实验,验证了电机动力学模型与仿真结果的有效性。

A correct dynamic model of a generator system is the foundation analyzing its stability and dynamic characteristics.The current impulse in consumer equipments is the major excitation source of torsional vibration of the drive mechnism of the generator.Considering such a current impulse,the dynamic model was established with the lumped parameter method and simulated using MATLAB.And the comparative analysis of the simulation results was carried out.It showed that if the diameter of the shaft is properly increased,the peak torque of torsional vibration of the elastic shaft can be effectively alleviated and the frequency margin increases.The validity of the dynamic model and the simulation results was verified with dynamic tests.