高速磁悬浮机床主轴的离散变结构控制

Discrete Time Variable Structure Control of High Speed AMB-Milling Spindle

中文关键词  磁悬浮轴承  机床主轴  高速切削过程  变结构控制

英文关键词  magnetic bearing  milling spindle  high speed cutting process  variable structure control

中文摘要

      研究了高速磁悬浮机床主轴的变结构控制, 建立了考虑切削过程的主轴 磁轴承系统动力学模型, 并以磁轴承为控制对象, 设计了离散变结构控制器来抑制主轴振动. 仿真结果表明, 变结构控制律对于阶跃、冲击及切削等扰动具有很强的抑制能力, 对系统模型摄动及复杂加工过程具有良好的适应能力.

英文摘要

      This paper deals with the variable structure control of high speed milling spindle supported by active magnetic bearings (AMB-spindle). The plant model consists of electromagnetic actuators, spindle dynamics and high speed cutting process. The discrete time variable structure controller (VSC) is designed to attenuate the spindle vibration caused by the cutting process and other disturbances. Simulations show that the VSC strategy is robust against external disturbances and model perturbation. In comparison with the PID controllers, the VSC also enables a satisfactory dynamic performance to be achieved in terms of variation in depth of cut.