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(一)前言在交流变频拖动中,突出的一点就是谐波影响:谐波引起系统效率降低、输出转矩波动。因此在系统方案设计——逆变器控制规律以及电机设计中,都想方设法减小谐波电压或抑制谐波电流,特别是减少低次谐波电压。为了检验这些措施的效果,在试验中必须测量逆变器输出电压谐波和电机的谐波电流。我们在交流变频调速试验中,同样需解决这个问题。在没有频谱分析仪的条件下,我们利用电动式仪
(A) Preface In the exchange of variable frequency drag, the prominent point is the harmonic effects: Harmonic caused system efficiency, output torque fluctuations. Therefore, in the system design - inverter control law and motor design, all try to reduce the harmonic voltage or suppress the harmonic current, especially to reduce the low-voltage harmonics. In order to test the effectiveness of these measures, the inverter output voltage harmonics and the motor harmonic currents must be measured during the test. We are in the exchange frequency control test, the same problem to be solved. In the absence of spectrum analyzer conditions, we use the electric meter