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。
TURNER UNI-DRIVE 5M4-85 LF
UNIVERSAL FLOW MONITOR LN-NSF110GM-24-32V10-R61WU-HT-40
ALLEN BRADLEY 1336S-B007-AN-EN4-L6 VARIABLE DRIVE
HYDRAULIC POWER PACK UNIT
BECKERT AND HIESTER PORTABLE FILTER HEPA
WAUKESHA SANITARY PUMP A3
ADVANCED MICRO CONTROLS INC 1744 ENCODER
MAGNETIC BOTTLE CAP CONVEYOR 18FT STAINLESS STEEL
ALLEN BRADLEY DRIVE IN 380-460V OUT 4 A 1305-BA04A
CONVEYOR 8FT BALDOR MOTOR DAYTON GEAR
POWER CONVERSION BOARD CP6701X1-FAB
ALLEN BRADLEY RAM MEMORY MODULE 1772-MEB SER A REV A
TOSVERT 130 G1 TRANSISTOR INVERTER
ALLEN BRADLEY AC CRIVE 1336F-BRF30-AA-EN-HAS2-L6
WESTINGHOUSE MOTOR CONTROL A200MACX MODEL J
