基于磁通门技术的转子位置传感器设计

Design of Rotor Position Sensor Based on Fluxgate Technology

磁通门传感器用于编码器的设计具有精度高,线性性能优越的优势。在驱动永磁同步电机时,转子位置信息的获取是关键,在低转速运行时,无位置传感器驱动技术以及现有传感器有较大的误差,给永磁同步电机的稳定驱动带来困难。文章设计一款基于磁通门技术的新颖转子位置传感器,能够提供高精度的转子位置信息。通过有限元方法分析说明了磁通门传感器的工作原理、工作特性以及磁场强度的探测范围,对磁通门编码器的径向充磁磁源的空间磁场进行了分析,并确定了磁通门传感器安装位置,最后通过制作磁通门编码器原型验了设计的实用性和新颖性。

Fluxgate sensors are used in the design of magnetic encoders with the advantages of high precision and superior linear performance.When driving PMSM,the acquisition of the rotor position information is the key.In the low-speed operation,the position sensorless driving technology and the existing sensor have large errors,which brings difficulties to the stable driving of PMSM.This paper designed and implemented a novel rotor position sensor based on fluxgate technology,which can provide high-precision rotor position information.In this paper,the finite element method was used to analyze the working principle,working characteristics and magnetic field strength detection range of the fluxgate sensor.The spatial magnetic field of the radial magnetizing magnetic source of the fluxgate encoder was analyzed,and the install position of the fluxgate sensor was determined.Finally,the design and practicality of the design were verified by making a fluxgate encoder prototype.