磁悬浮电主轴集成控制系统的动态性能研究

Research on Dynamic Performance of Integrated Control System of Magnetic Suspension Spindle

将磁轴承的位置控制和电流控制等环节集成到一片现场可编程门阵列(FPGA)芯片上,设计了基于FPGA的磁轴承集成控制器硬件结构。建立了磁悬浮电主轴的数学模型,并根据其动态性能要求,编写了基于Verilog代码的H∞控制算法,实现了五自由度磁悬浮电主轴在60 000r/min长期稳定运转,并且转子振动幅值小于2μm。研究结果表明,采用基于FPGA集成控制器的H∞控制策略能够提高磁悬浮电主轴的动态性能。

This paper presented an integrated controller that implemented the function of position control and current control of AMBs（active magnetic bearings）with one FPGA（field programmable gate array）chip,and showed the design process of the FPGA integrated controller.A mathematical model of a high-speed spindle supported with AMBs was established.According to the analysis of dynamic performance of the spindle,the H∞control algorithm was implemented by Verilog.The controller was applied to grinder spindle system successfully and achieved 60 000r/min high-speed rotating when the rotation accuracy was limited to 2μm.The results shows that the H∞ control implemented by FPGA integrated controller can improve the dynamic performance of the high-speed spindle supported with AMBs.