磁悬浮立式铣床主轴稳态特性

Steady-State Performance of Active Magnetic Vertical Miller Spindle

分析磁悬浮立式铣床主轴控制系统中PID参数对系统阶跃响应的影响,优选出两组PID参数,并对磁悬浮立式铣床主轴在不平衡激扰力作用下的动态特性进行仿真研究。结果表明,PID控制器的比例参数影响系统阶跃响应的超调量,积分参数有利于减小系统稳态误差,但积分作用不易过大,微分环节影响系统的响应时间;磁悬浮立式铣床主轴质量不平衡引起的激扰力会降低主轴旋转精度,在不平衡激扰力作用下,磁悬浮立式铣床主轴端面中心将产生与其转速同频率的周期性振荡,随着磁悬浮主轴转速升高,主轴端面中心振荡加剧。

The influence of PID parameters on the step response of active magnetic vertical miller spindle control system is analyzed,two groups of PID parameters are optimized, and the dynamic performance of disturbance force to magnetic spindle is analyzed. The results show that the proportion parameter mainly influences the overshoot of the spindle step response, and the integrator parameter can reduce the steady - state error of the system,but the integral parameter can not too big,and that the derivative parameter mainly in-fluences the adjustment time of the spindle step response. The disturbance force caused by the mass unbalance can reduce the rotating accuracy of the spindle. The spindle end plane center will create the cyclical vibration with the same frequency as the spindle speed ,the spindle end plane center cyclical vibration become severely with the increase of the magnetic suspension spindle speed.