基于电磁阻尼–弹簧系统的永磁同步直线电机推力波动抑制研究

Thrust Fluctuation Suppression of Permanent Magnet Synchronous Linear Motor by Using Electromagnetic Damping-spring System

永磁同步直线电机(permanentmagnetsynchronous linear motor,PMSLM)由于推力波动的存在,影响其在精密数控加工设备中的应用。该文结合PMSLM的结构和运动特点,设计一种电磁阻尼–弹簧系统以实现推力波动的抑制。首先,分别建立PMSLM及电磁阻尼–弹簧系统的动力学模型,分析电磁阻尼–弹簧系统实现推力波动抑制的过程;其次,以推力波动作为电磁阻尼–弹簧系统的激励,采用胡克定律分析弹簧产生的弹力,采用虚功原理分析电磁阻尼器产生的电磁阻尼力,进而得到抑制推力波动的抑制力;然后,通过仿真分析验证解析的正确性,并优选电磁阻尼–弹簧系统的关键参数;最后,通过样机测试验证所提出的方法在不同速度和负载下均能够有效的抑制推力波动。

The thrust fluctuation of permanent magnet synchronous linear motor(PMSLM) limits its application in precision machining equipment. In this paper, an electromagnetic damping-spring system was designed with the structure and motion characteristic of PMSLM for thrust fluctuation suppression. First, the kinetic model of the PMSLM and electromagnetic damping-spring system was established, and the vibration suppression principle of the vibration suppression device was analyzed. Then, the thrust fluctuation as the excitation of the electromagnetic damping-spring system, the Hooke’s law was used to analyze elastic force and the electromagnetic damping force was analyzed by the principle of virtual work. Therefore, the suppression force of the vibration suppression system was obtained. Next, the correctness of the analysis was verified by simulation analysis. And the optimized relevant structural parameters of electromagnetic damping-spring system were selected. Finally, prototype experiments verified that the proposed method can effectively suppress the thrust fluctuation under different speeds and loads.