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。
LFC-7300 LIQUID FLOW CONTROLLER WATER /CHEMICAL /SLURRY
MOTORIZED LINEAR MOTION GSI LASER SCANNER GALVO MOTOR
LOT 6 DEUTERIUM LAMP USHIO XENON SHORT / FREE SHIP
LOT 4 NIHON SEIKI PNEUMATIC CYLINDER / ACTUATOR / ROLLE
EXLAR SR LINEAR SERVO ACTUATOR SR31 / CABLES / SENSORS
NEW MEIJI STEREO ZOOM MICROSCOPE HEAD STAND POSTS BASE
NEW MELLES GRIOT 6" VACUUM CHUCK OBJECTIVE LENS ALIGNER
SMC SIERRA MONITOR GAS CALIBRATOR 1250 CALIBRATION KIT
MOLECULAR DEVICES SpectraMax 190 TOP COVER ENCLOSURE
Lot 4 Laserscope Laser Focusing CoolSpot Handpiece Part
SONY CMA-D2 ADAPTER PANASONIC CAMERA TAMRON 210mm LENS
