单绕组无轴承磁通切换电机转子空间位置估计及其无传感器复合控制

Rotor Spatial Position Estimation and Sensorless Composite Control of Bearingless Flux-switching Permanent Magnet Motors

已有关于单绕组无轴承电机的无传感器技术仅对转子切向位置或径向位移的其中一项进行研究,未能同时实现转子空间位置(切向位置和径向位移)的估计。对此,针对无轴承磁通切换电机(bearingless flux-switching permanent magnet machines,BFSPMM)提出一种转子空间位置估计方法及其无传感器复合控制策略。首先,构造含有转子空间位置信息的磁链函数,分别推导出仅关于转子切向位置信息的转矩平面磁链函数和包含转子径向位移信息的空间对称绕组偏差磁链函数。然后,基于磁链函数提取出转子空间位置信息,将所估计的信息代替传感器检测信号,通过无传感器复合控制策略,实现BFSPMM无空间位置传感器控制,并进行稳定性分析。最后,实验验证了所提方法的有效性。

The sensorless control technologies for single-winding bearingless motors focus on either the tangential position or radial displacement, at present, and the estimation of the spatial position(i.e., the tangential position and radial displacement) of the rotor has not been realized simultaneously. In this paper, an estimation method of the spatial position and its sensorless composite control strategy for a bearingless flux-switching permanent magnet motor(BFSPMM) were proposed. First, a flux linkage function which includes information of the spatial position was constructed, thence to derivate the flux linkage function of the torque plane and the bias flux linkage function of spatial symmetricwindings, and they included the information of the tangential position and radial displacement, respectively. Second, the spatial position information of the rotor was extracted based on the flux linkage function, and the signals detected by the sensors were replaced with the estimated information to realize the sensorless control for the BFSPMM. The stability of the control system was analyzed. Finally, the experimental results verify the validity of the proposed scheme.