传感技术学报2018，Vol.31Issue(3)：342-346,5.DOI:10.3969/j.issn.1004-1699.2018.03.004
一种采用压电复合音叉的电流传感器研究
Research on a Novel AC Current Sensor Using a Piezoelectric Composite Tuning-Fork
王英 1杨爱超 1周煦光 1刘见 1朱亮 1李敏 1吴宇 1张吉涛 2何伟3
作者信息
- 1. 国网江西省电力有限公司电力科学研究院,南昌330096
- 2. 郑州轻工业学院,郑州450002
- 3. 广西百色学院,广西百色100120
- 折叠
摘要
Abstract
The conventional non-connect measurement strategy for AC current shows low sensitivity and complex structure. In order to enhance the measurement sensitivity at low-frequency,a current sensor using a piezoelectric composite tuning-fork is presented,which consists of permanent magnets,an elastic copper tuning fork,piezoelectric PZT plates,and a pedestal. When the sensor is situated in the magnetic field induced by AC current in the power transmission line,the magnetic torque applied on the permanent magnet appears,and drives fork beams and PZT plates to bend. Therefore,alternating voltage signal produces across the electrodes of PZT plate,and thus the input current in power transmission line can be obtained by the relation between input current and output voltage. Due to the great magnetic torque effect,the presented sensor behaves high sensitivity which is about 4.0 times greater than that of the traditional sensor using a piezoelectric cantilever. The experiments show the sensor has a resonant sensi-tivity of ~1.393 V/A and a linearity of ~0.57% with the load resistance of 10 MΩ at the frequency of 41.7 Hz.The proposed sensor can be further used in the fields of vibration and magnetic signal detection.关键词
非接触电流测量/压电效应/压电复合音叉/永磁铁Key words
non-connect AC current measurement/piezoelectric effect/piezoelectric composite tuning-fork/permanent magnets分类
信息技术与安全科学引用本文复制引用
王英,杨爱超,周煦光,刘见,朱亮,李敏,吴宇,张吉涛,何伟..一种采用压电复合音叉的电流传感器研究[J].传感技术学报,2018,31(3):342-346,5.
