基于MCSA的离心泵转速测量与试验研究  

MCSA-based rotational speed measurement of centrifugal pump and experiment

作　　者：石洋[1] 袁建平[1] 骆寅[1] 周帮伦 孙慧[1] 

机构地区：[1]江苏大学国家水泵及系统工程技术研究中心,江苏镇江212013

出　　处：《排灌机械工程学报》2017年第11期927-932,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51409125);江苏高校优势学科建设工程项目

摘　　要：阐述了传统离心泵转速测量方法及其存在的问题,提出了基于电动机电流信号分析(MCSA)测量离心泵转速的方法,应用信号处理理论,对方法的原理进行了数学推导.应用驱动电动机通电后定子绕组中存在与转子频率相同电流的原理,利用MCSA方法,分析电动机定子电流信号成分,从定子电流频谱中检测出转子频率.根据方法的原理设计了验证试验,试验过程中,变频器产生不同频率的电源为电动机供电,调节离心泵的流量,运用霍尔元件和数据采集卡,采集离心泵驱动电动机在不同流量下的定子电流信号,信号经过解调和快速傅里叶变换(FFT),在限定的转频范围,从电流频谱中得到转频.为了验证方法的准确性,用动静干涉机理测速法和光学测速法进行了对比试验,试验结果表明:与光学测速以及动静干涉机理测速相比,基于MCSA的转速测量方案的误差均在2%以内,满足离心泵状态监测的要求,实现了离心泵转速的无传感器测量,精度较高,适用性强.研究结果具有一定的应用价值.Traditional methods for rotational speed measurement of centrifugal pump and their problems were analyzed. A new method for the rotational speed measurement was proposed based on motor current signal analysis（ MCSA）,then its mathematic equation was deduced using data processing theory.According to a principle that the frequency of current in stator windings are equal to the rotating speed frequency of the rotor when a centrifugal pump is driven by an AC motor,the frequency component of motor stator current was acquired by means of MCSA technology. Finally,the rotating speed frequency was detected from the current frequency spectrum. A trail experiment was designed according to this principle. During a test,the motor was fed by a frequency converter which could generate AC power with various frequencies,and the flow rate was adjusted,then the motor stator current was sampled by Hall effect sensors and a data acquisition card. After demodulation and fast Fourier transform（ FFT）,the rotating speed frequency was detected in frequency spectrum within a restricted range. To validate this method,a method based on rotor-stator interaction and an optical tachometer method was also usedto get the speed. Compared with these two methods,the new method proposed was subject to an error less than 2%,and this accuracy has met the requirement of centrifugal pump monitoring,demonstrating a potential application in centrifugal pumps. Moreover,it is a sensorless method which can be realized in a better accuracy and more flexible applicability. This outcome is subject to application significance in some degree.

关 键 词：离心泵 转速测量 电动机电流信号分析 无传感器测量 

分 类 号：S277.9[农业科学—农业水土工程] TH311[农业科学—农业工程]