EHB用无刷直流电机齿槽转矩电流补偿控制策略研究

Exploring Current Compensation Control Strategy for Reducing Cogging Torque of Brushless DC Motor in EHB

电子液压制动系统现已普遍使用无刷直流电机,但其齿槽转矩会影响电机伺服控制品质,进而阻碍EHB综合性能的提升。为此,开展EHB用无刷直流电机齿槽转矩的电流补偿控制策略研究。首先,通过解析分析和有限元方法获取齿槽转矩变化规律;其次,根据齿槽转矩与转子位置的映射关系,提出基于电机位置信号的转矩实时电流补偿控制策略;最后,搭建电机的控制模型和有限元模型,并进行联合仿真。研究结果表明:加入电流补偿控制策略后,电机转速和转矩波动明显降低,位置伺服精度得到提升,有效抑制了齿槽转矩对电机伺服控制品质的影响。

The brushless DC motor(BLDCM) is widely used in an electronic hydraulic braking system(EHB), but its cogging torque affects its servo control quality, thereby hindering the improvement of the EHB’s comprehensive performance. For this reason, the research on thecurrentcompensation control strategy for reducing the cogging torque of the BLDCM in the EHB is carried out in this paper. Firstly, the cogging torque variation law is obtainedwith the analytical method and the finite element method. Secondly, based on the mapping relationship between cogging torque and rotor position, a control strategy for the real-time current compensation of the cogging torque based on the motor position signal is proposed. Finally, the control model and the finite element model of the BLDCM are built and their simulations are jointly conducted. The research results show that after the current compensation control strategy is used, the motor speed and torque fluctuation are significantly reduced, the position servo accuracy is improved, and the influence of cogging torque on the quality of motor servo control is effectively suppressed.