无论是哪一种变频器，都大量使用了晶闸管等非线性电力电子元件，不管采用整流方式，变频器从电网中吸取能量的方式都不是连续的正弦波，而是从脉动的断续方式向电网索取电流，这种脉动电流和电网的沿路阻抗共同形成脉动电压降叠加在电网的电压上，使电压发生畸变，经傅立叶原理分析可知，这种非同期正弦波电流是由于频率相同的基波和频率大于基波频率的谐波组成。
APPLIED MATERIALS - 0190-02385 - ANODE, GENERATION 6A
APPLIED MATERIALS - 0190-02831 - CONTROLLER, MAGLEV
APPLIED MATERIALS - 0190-03169 - BE AEROSPACE C1.2
APPLIED MATERIALS - 0190-05274 - WATER,VORTEX,STEP,TAPE
APPLIED MATERIALS - 0190-06909 - KENSINGTON PRODUCER
APPLIED MATERIALS - 0190-09265 - ASTEX, OZONATOR WAVE
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APPLIED MATERIALS - 0190-12847 SCR LAMP DRIVER 15 ZONE
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APPLIED MATERIALS - 0190-35236 CNTRL, CALIBRATED FIBER
APPLIED MATERIALS - 0190-35236 CNTRL, CALIBRATED FIBER
APPLIED MATERIALS - 0190-35430 CONTROL, THERMOMETER
