Sensorless Control for Linear Electromagnetic Actuators with Permanent Magnet Mover

本课题的研究目标是以永磁体为动子的直线电磁执行器的无位置传感器控制。这种类型的执行器在定子中包含两个串联的线圈，其中电流方向相反，动子是夹在铁磁材料的两个极靴之间的圆盘状永久磁铁。由于它们的双向作用力特性，这些执行器对于位置控制应用非常有利。由于安装位置传感器的额外成本和复杂性，本项目的目的是对这些执行器进行位置估计和控制。位置是通过估计致动器的位置相关磁特性来估计的。由于磁特性的内在对称性，为了实现全行程范围内的位置估计，必须结合至少两种估计方法，这就产生了一个复杂而有趣的研究问题。

The aim of this project is sensorless control for linear electromagnetic actuators which have permanent magnets as mover. This type of actuators houses two coils in the stator connected in series where the currents have opposite directions and the mover is a disc shaped permanent magnet sandwiched between two pole shoes of ferromagnetic material. Due to their bidirectional force characteristic, these actuators are very beneficial for position control applications. Because of the additional cost and complexity of installing position sensors, the aim of this project is position estimation and control for these actuators. The position is estimated by estimating the position dependent magnetic properties of the actuator. Due to an inherent symmetry in the magnetic characteristics, at least two estimation methods would have to be combined in order to achieve position estimation in the full stroke range, yielding a complex and interesting research problem to solve.