针对主被动磁悬浮转子高速旋转时质量不平衡和被动磁轴承磁中心的偏移导致的同频振动力问题,提出了一种基于位移陷波加前馈补偿的自动平衡控制方法.首先,在转子为零位移控制状态下提取控制电流的同频成分,计算获得与被动磁轴承磁中心偏移相关的参变量;然后,在额定转速下设计通用陷波器以消除同频电流,前馈补偿主动磁轴承、被动磁轴承位移负刚度力和被动磁轴承磁中心偏移力,使主被动磁轴承的同频输出力为零,实现了转子绕惯性中心旋转.对提出的方法进行了仿真和实验验证并与仅补偿质量不平衡的算法进行了对比.仿真结果显示:提出的方法的同频磁轴承力减小到了只进行质量不平衡补偿算法的6%;实验结果显示:同频振动加速度减小到只进行质量不平衡补偿算法的233%.仿真和实验验证了该方法的有效性,表明该方法对同频振动抑制效果显著,实现了转子的自动平衡控制.

As synchronous periodic vibration forces are induced by both uneven distributed mass and magnetic center offset when the active-passive hybrid magnetically suspended rotor rotates at high speed,this paper proposes an autobalancing method to remove the vibration forces.Firstly,the offset parameters of the passive magnetic bearing were calculated from the synchronous periodic control currents extracted in the zero-displacement control condition.Then a general notch filter was designed to inhibit the synchronous current and to obtain the synchronous displacement at the same time.After carrying out the feedforward compensations of active-passive magnetic bearing displacement stiffness force and the offset of the passive magnetic center,the synchronous period force component of the active-passive magnetic bearings was removed entirely.The method was verified by simulations and experiments,and compared with an algorism without passive magnetic center offset compensation.The simulations indicate that the synchronous force has reduced to 6% of the algorithm without passive magnetic center offset compensation.Experimental results indicate that the synchronous vibration acceleration has reduced to 23.3% of that without passive magnetic center offset compensation.Simulation and experiment results demonstrate the effectiveness of the proposed method and show that the method is effective for elimination of synchronous vibration force and realizes the automatic balance control for rotors.