无源多动子永磁同步直线电机定位方法研究

Research on Positioning Method of Multiple Passive Mover in Permanent Magnet Linear Synchronous Motor

为实现永磁同步直线电机系统中对多个无源动子的绝对定位,设计了基于双磁道的短磁栅、长传感器定位方案。双磁道包括增量式磁道和绝对式磁道,每个磁道中的短磁栅为永磁体阵列,长传感器内霍尔阵列由线性霍尔芯片组成,且长传感器包含多个线性霍尔阵列。其中,增量式磁道采用区间查表方式计算位移增量,绝对式磁道采用连续位移编码方式识别绝对偏移量。定子传感器数字信号输出的霍尔芯片阵列与主控MCU之间通过总线方式连接,且信号处理和传输均在MCU中进行,简化了硬件电路。结果表明,无源多动子绝对位置传感器具有不同应用场景便于移植的特点,使无源动子的定位更灵活。

To achieve absolute positioning of multiple passive movers in permanent magnet synchronous linear motor systems,a short magnetic gate and long sensor positioning scheme based on dual magnetic tracks was designed.The dual track consists of incremental and absolute tracks,with a short magnetic gate in each track being a permanent magnet array.The Hall array inside the long sensor is composed of linear Hall chips,and the long sensor contains multiple linear Hall arrays.Among them,incremental magnetic tracks use interval table lookup to calculate displacement increment,while absolute magnetic tracks use continuous displacement encoding to identify absolute offset.The hall chip array outputted by the stator sensor digital signal is connected to the main control MCU through a bus,and signal processing and transmission are carried out in the MCU,simplifying the hardware circuit.The results indicate that passive multi mover absolute position sensors have the characteristics of being easy to transplant in different application scenarios,making the positioning of passive movers more flexible.