开关磁阻电机恒加速度起动方案研究

针对开关磁阻电机起动/发电系统起动时转矩过冲导致的断轴问题,开展了SR电机起动特性分析,根据SR电机机械特性方程,建立了电磁转矩随负载转矩变化特性与转子加速度之间的关系。为了对SR电机进行非线性的调速控制,基于Ansoft分析得到的转矩、电流、角度二维表,对负载转特性已知情况提出了利用插值查表法的转矩控制恒加速度法;基于PID控制原理,对负载特性未知情况提出了一种PI参数和开通关断角随转速变化的PWM控制恒加速法。运用Matlab/Simulink建立了非线性模型,进行了起动加速阶段的仿真试验。研究结果表明,恒加速度起动方案能使输出转矩跟随负载转矩变化,有效提高SR起动/发电系统的可靠性。

Switched reluctance motor starting with constant acceleration

Aiming at the problems of bearing failure caused by torque overshoot of switched resistance （SR） starter/generator system existed in starting stage,after the analysis of SR motor starting characteristics on the basis of mechanical properties of SR motors,the relevance between the character of electromagnetic torque changing with load torque and acceleration was established.In order to adjust the SR motor＇s speed in nonlinear way,based on the two-dimensional table of torque from Ansoft,current and angle,a method of constant acceleration by torque control was presented for known character of load torque.Based on the principal of PID control,a method of constant acceleration on PWM in witch the PI parameters and opening angle/turn-off angle change with rotating speed was presented for unknown character of load torque.By establishing the nonlinear model on Matlab/Simulink,the simulation of starting phase was tested.The experimental results show that the methods of constant acceleration can make electromagnetic torque follow load torque and improve the reliability of the SR starter/generator system effectively.