电机非正弦供电电压单周期真有效值同步采样  

Synchronous sampling measuring method of the single-cycle true RMS of motor non-sinusoidal power supply voltage

作　　者：刘刚[1] 陈树新[1] 罗维东[1] 

机构地区：[1]北京科技大学机械工程学院,北京100083

出　　处：《电机与控制学报》2014年第1期112-116,共5页Electric Machines and Control

基　　金：国家高技术研究发展计划(863计划)(2011AA060408);国家科技支撑计划课题(2013BAB02B07);北京市科技计划项目(Z121100003012016)

摘　　要：针对电动机定子绕组输入的非正弦脉宽调制电压真有效值测量困难的问题,提出了一种非正弦周期信号单周期真有效值测量方法,该方法从交流电压真有效值的定义出发,采用数字离散同步采样测量法,利用DSP对非正弦脉宽调制电压的瞬时值进行高速采样,将硬件同步法与软件同步法相结合,可以实时精确测量电动机定子绕组输入的非正弦周期交流电压信号真有效值。给出了该方法对电动机定子绕组上的脉宽调制交流电压真有效值的测量结果,并将结果同福禄克(FLUKE)Norma 5000功率分析仪进行了比较,相对误差控制在1%以内。该方法不仅可以实时测量非正弦周期信号的真有效值,同样可以测量规则的正弦交流电压真有效值。Aiming at the problem of measuring the true root-mean-square （RMS） of pulsing AC voltage on the motor stator windings, this paper proposes a real-time measuring method of the single-cycle true RMS of non-sinusoidal periodic signal. According to the definition of true RMS AC voltage, it adopted digital discrete synchronous sampling measuring method, used DSP to sample the instantaneous value of non si- nusoidal pulse width modulation voltage, and combined the hardware synchronization method with the software synchronous method, in order to accomplish the real-time accurate measurement of the true RMS of non-sinusoidal periodic AC voltage signal. In this paper, it compared the results of this method by measuring the true RMS of pulsing AC voltage on the motor stator windings with the results of FLUKE Norma 5000 power analyzer. The relative error is less 1%. This method can measure not only the true RMS of non-sinusoidal periodic signal but also the true RMS of the sinusoidal AC voltage.

关 键 词：电机非正弦供电 单周期真有效值 数字离散同步采样 硬件同步法 软件同步法 

分 类 号：TP216[自动化与计算机技术—检测技术与自动化装置]