基于模型切换策略的无刷直流电动机调速研究

Research on Speed Control of Brushless DC Motor Based on Model Switching Strategy

提出了一类基于模型切换策略的无刷电机宽范围调速方法,根据电机特性给电机速度目标值定义高/低速运行区间,当电机在低速区运行时,采用积分分离PID控制策略;电机在高速区运行,采用增量式PID控制策略,结合预先设定的速度过渡区,通过滞后切换实现控制模型转换。实验表明,提出的模型切换控制策略在低速和高速运行区域均能实现无刷直流电动机精确速度闭环控制,且模型间切换控制过程稳定,实现了无刷直流电动机的宽范围调速。

A wide range speed adjustment method of brushless DC motor based on model switching strategy was proposed. According to the motor characteristics the high/low speed operating range was defined for a target value of motor speed,using integral separation PID control strategy when the motor running in low speed region and using the incremental PID control strategy when the motor in high speed. Combined with the preset speed transition region,t he control model was transformed by hysteresis switching. Experimental results show that the proposed model switching control strategy in the region of the low- speed and high- speed operation can achieve precise speed closed- loop control of brushless DC motor,wide speed range,and stable model switching.