宽测量间距巨磁阻齿轮转速传感器的研制  

GMR-based Gear Sensor with Wide Air Gap

作　　者：窦珂[1] 钱正洪[1,2] 于晓东 白茹[1] 时劭华[1] 詹宏良 孙宇澄[1] 杨昌茂 

机构地区：[1]杭州电子科技大学磁电子中心,浙江杭州310018 [2]东方微磁科技有限公司,湖北宜昌443003

出　　处：《仪表技术与传感器》2012年第11期13-15,共3页Instrument Technique and Sensor

基　　金：浙江省教育厅"磁性材料和器件"高校创新团队(2009[171]);浙江省重点科技创新团队子项目((2010R50010);浙江省重大科技专项重点工业项目(2011C11047)

摘　　要：文中设计了一种宽测量间距齿轮转速传感器。所研制的齿轮转速传感器选用巨磁阻芯片作为敏感元件,永磁体提供偏置磁场,通过信号处理电路采集齿轮转动过程中所产生的磁场扰动信号实现齿轮转速的测量。采用有限元磁场仿真软件Ansoft Maxwell仿真了该齿轮转速传感器工作时,巨磁阻敏感芯片周围的磁场分布及变化情况,并通过实验验证了仿真数据的正确性。所研制的齿轮转速传感器不仅具有频率性能好,灵敏度高,体积小等优点,测量间距可超过4 mm,解决了传统转速传感器测量间距小的问题。This paper designed a GMR-based gear sensor. The sensor included three parts, a GMR （i giant magneto-resistance） sensor element, a magnet placed behind the sensor, and a circuit for processing the sensor output, which was a reflection of the mag- netic field signals generated from the gear rotation. Ansoft Maxwell software was used to simulate and analyze the magnetic field sig- nals generated on the GMR sensor element by the gear rotation, and then the experiments were carried out to confirm that the sensor output was in agreement with the simulated results. The GMR-based gear sensor has excellent characters of wide bandwidth, high sensitivity,small size,and can realize measurement of the rotation speed with the air gap more than 4 ram. The GMR-based gear sensor is an ideal replacement for the traditional gear speed sensors,which have to be placed closely to the gear.

关 键 词：巨磁阻 齿轮转速传感器 宽测量间距 

分 类 号：TN4[电子电信—微电子学与固体电子学]