摘要
提出一种新型提离自校正非接触位移传感器,该传感器采用一对正交的霍尔元件来检测移动永磁体激励磁场的X和Y向分量,其中BX反映永磁体提离信息,BY反映永磁体位移信息。然后基于等效面电流方法,建立起位移传感器的数学模型。最后运用有限元方法对位移传感器的特性进行了分析,得到传感器提离时BX和BY的变化规律,为自校正位移传感器的实现提供依据。研究结果表明:BY正负峰值间曲线近似为线性,与永磁体位移存在对应关系;随着永磁体提离高度的增加,BX谷值大小和BY正负峰值间曲线斜率均相应改变;通过检测BX谷值的大小辨识出传感器提离高度,然后对BY曲线进行相应的修正,可抑制提离对传感器精准度的影响。
This paper presents a novel magnetic contactless displacement sensor with lift-off adjustment, which consists of a pair of Hall-effect sensors and a moving permanent magnet. The two Hall-effect sensors are used to detect the Bx and By induced by the moving permanent magnet. The Bx and By curves refleet the nature of the lift-off and the displacement of the inducing permanent magnet, respectively. Then based on the facing current method, the model of the displacement sensor is constructed. Finally, the model of the presented sensor is built in finite element method, and the characteristics of Bx and By are analysed under lift-off condition. The research results show the curve between the two peaks of the By curve is linearly changed with the variety of the permanent magnet displacement. The magnitude of Bx trough and the slope of the curve between the two peaks of the By decrease with the increasement of lift-off distance, respectively. The By curve can be corrected according to the lift-off distance of Hall-effect sensor distinguished by the Bx trough value, which can eliminate the influence of the lift-off on the output.
出处
《传感技术学报》
CAS
CSCD
北大核心
2008年第9期1541-1545,共5页
Chinese Journal of Sensors and Actuators
基金
国家高科技(863)研究发展专项经费项目资助(2006AA110110)
国家自然科学基金项目资助(60674094)
关键词
自校正
永磁体
提离
非接触位移传感器
self-adjusting
permanent magnet
lift-off
eontactless displacement sensors
