基于变角度搜索算法的磁悬浮高速电机刚性转子系统的不平衡补偿方法

Unbalance Compensation Method of an Active Magnetic Bearings-rigid Rotor System for High-speed Motors Based on Variable Angle Seeking Algorithm

为降低主动磁轴承(active magnetic bearing,AMB)刚性转子系统的同频不平衡振动,通常采用基于陷波器的不平衡补偿方法,若要实现全转速范围内的振动抑制,需要对传统陷波器结构进行改进,但改进后的滤波器会对系统的稳定性产生影响。为避免此问题,该文提出基于定角度搜索和变角度搜索算法的AMB刚性转子系统不平衡振动抑制方法,直接根据转子实时振动大小产生控制信号的方法来实现不平衡补偿。定角度搜索算法设计简单,但是搜索角度单一,搜索规则固定,往往不能快速地搜索到目标值。进而对定角度搜索算法的搜索角度进行改进,使其可以根据转子实时振动在线调整,即进一步设计了变角度搜索算法。由于变角度搜索比定角度搜索算法的搜索过程更加灵活,因此AMB刚性转子系统的不平衡振动可以快速得到抑制。这种算法既不需要对陷波器结构进行改进,也不需要在转子临界转速前后对陷波器极性进行切换。

In order to reduce the synchronous unbalance vibration of active magnetic bearing(AMB) rigid rotor systems, the unbalance compensation method based on the notching filters is often adopted to achieve vibration suppression. In order to control the rotor vibration of the full rotational speed including the rigid mode frequency, the conventional notching filters need to be improved. However, improved notch filters may affect the stability of the rotor system. To avoid this problem, methods using fixed angle seeking algorithm variable angle seeking algorithm were proposed to suppress unbalance vibration of the AMB rigid rotor system, in which a control signal was generated to realize the unbalance compensation according to the real-time vibration of the rotor. Design of the fixed angle seeking algorithm was simple, but the seeking angle was single and the seeking rule was fixed, so it hard to achieve the target value quickly. Then the seeking angle of the fixed angle seeking algorithm was improved so that it could be adjusted online according to the rotor real-time vibration, that was, the variable angle seeking algorithm was further designed. Because seeking process of the variable angle was more flexible than that of the fixed angle, the unbalance vibration of AMB rigid rotor system could be quickly suppressed. This algorithm was not necessary to improve the structure of conventional notch filters, or to switch the polarity of the notching filters before and after the critical speed of rotor system.