非正弦供电交流电机特性的微机测试

Performance test of non-sinusoidal A. C. machines by using microcomputer

随着交流调速及电力电子技术的发展,采用电力半导体变流装置供电的交流电机越来越多。由于供电电压和电流波形的非正弦,采用传统电工仪表,将难以准确测试电机的特性,本文介绍了采用单板机或单片机准确测量非正弦电压和电流有效值、频率、功率因数、电压和电流正弦波形畸变率以及各次谐波分量的测试方法。该种测试装置成本低廉,一机多用。具有足够的工程精度。

In company with the development of adjustable A. C. drives and power electronics, there are more and more A. C. , machines supplied by static power semiconductor converter. It is difficult to test the machine performance accutely with tranditional electrotechnical instruments since the voltage and cur rent are non-sinusoidal. This paper introduces an accurate method to measure the RMS value of voltage and current , frequency, power factor, waveform distortion ratio and its harmonic components of non sinusoidal voltage and current by using single board or single chip computer. This instrument has some advantages, such as multifunctional, low cost and sufficeint engineering accuracy etc. .