智能电动机保护器中电流检测环节的设计与实现  

Design and Implementation of Current Detection Part in Intelligent Motor Protection

作　　者：裴喜平[1] 郝晓弘[1] 

机构地区：[1]兰州理工大学电气工程与信息工程学院,甘肃兰州730050

出　　处：《仪表技术与传感器》2012年第2期63-65,共3页Instrument Technique and Sensor

基　　金：甘肃省工业过程先进控制重点实验室资助项目(XJK0905)

摘　　要：电动机的广泛使用,开发对其进行保护的智能保护装置具有重要意义,首先需要解决的就是电流检测问题。文中采用线性霍尔传感器对电流检测,设计了信号调理电路,分析了影响采样计算有效值的因素,修正了有效值计算方法,利用最小二乘法对数据进行处理,得到了信号调理信号与实际电流有效值之间的线性系数。开发了实时监视界面,方便了数据的采集分析,实验结果证实电流检测达到了较高的精度。The electric motors are widespreaded, the development of its intelligent protection device for protection is very im- portant. First of all, need to be addressed is the current detection. This paper designed the linear Hall sensor for current sensing, signal conditioning circuit. Based on the analysis of the factors that affect the sample calculation of RMS, RMS revised calculation method was proposed. It used the least square method for processing data, obtained the linear coefficient between the actual current RMS and conditioning signal RMS. The paper developed a real-time monitoring interface for the data acquisition and analysis, the experimental results show that current detection achieves a higher precision.

关 键 词：线性霍尔传感器 信号调理 电流有效值 最小二乘法 

分 类 号：TM932[电气工程—电力电子与电力传动]