飞轮轴向永磁轴承的径向干扰力分析与控制研究

Analysis and control of radial disturbing force of the axial permanent magnetic bearing in flywheel

针对飞轮轴向永磁轴承带来的径向干扰力问题,推导了径向干扰力的解析表达式,对干扰力的幅值和方向特性以及它的线性化结果进行了研究。对飞轮运行过程中径向干扰力带来的影响和电磁轴承位移刚度系数变化之间的关系进行了归纳,提出了基于修正参数零力控制算法的电磁轴承控制方法,来抑制飞轮转子系统的干扰力;利用Simulink仿真平台,对包含飞轮转子系统、轴向永磁轴承和电磁轴承零力控制算法的模型进行了测试。研究结果表明:在径向电磁轴承控制算法中采用修正前馈系数的零力控制算法,可以将飞轮转子系统外传力控制在原先的3%,较好地满足了系统干扰力的控制要求。

Aiming at the problem of the radial disturbing force from axial permanent magnetic bearings the analytical expression was de duced the amplitude and direction characteristics of the disturbing force were studied and the linearized result was obtained. The relationship between the influence of radial disturbing force and the change of displacement stiffness was concluded. An arithmetic called variable parameter zero force control(VPZFC) in active magnetic bearings(AMBs) was investigated to suppress the disturbing force. A simulating model including flywheel system axial permanent magnetic bearings and the VPZFC was evaluated on the Simulink platform. The results indicate that the distur bing force could be suppressed to 3% of the original with the action of VPZFC in AMBs which meets the control requirement well.