磁电式转速传感器高温绝缘性能提升研究

Research on High Temperature Insulation Performance Improvement of Magneto-electric Speed Sensor

文章对磁电式转速传感器高温绝缘性能不良故障进行分析,定位故障原因为用于传感器内部灌封的非金属材料高温绝缘性能下降。根据电路仿真分析可知,转速传感器高温绝缘下降不影响输出特性,现有产品可继续使用。进一步提出了提升传感器高温绝缘性能的改进方案,更改灌封材料为硅橡胶GP551,该改进方案经过温度冲击试验和温度-振动综合试验验证可行有效,并对产品机械结构强度和可靠性无不利影响。

This paper analyzes the fault of poor insulation performance of magneto-electric speed sensor at high temperature.The fault was caused by a decline in the high temperature insulation performance of the non-metallic material used for the internal potting of the sensor.According to the circuit simulation analysis,the output characteristics of the speed sensor are not affected by the decline of high temperature insulation,and the existing products can continue to be used.Furthermore,an improvement scheme was proposed to improve the high temperature insulation performance of the sensor.The sealing material was changed to Silicone Rubber GP551.The improved scheme has been verified by temperature shock test and temperature-vibration comprehensive test,and has no adverse effect on the strength and reliability of mechanical structure of products.