變頻器的應用范圍很廣，從小型家電到大型的礦場研磨機及壓縮機，全球約1/3的能量是消耗在驅動定速離心泵、風扇及壓縮機的電動機上，而變頻弱的市場滲透率仍不算高，利用變頻器來控制電動機的轉速，帶來能源效率的顯著提升，是使用變頻器的主要原因之一。變頻器技術和電力電子有密切關系，包括半導體切換元件、變頻器拓撲、控制及模擬技術、以及控制硬件及固件的進步等。
Variable frequency drive (VFD), also known as variable frequency zone actuator or drive controller, is a Japanese product name called Inverter, which is the same as the English name of inverter. The English name of variable frequency drive is one of the few modern technologies that originated from Chinese
A frequency converter is a type of adjustable speed drive system that uses variable frequency drive technology to change the frequency and amplitude of the working voltage of an AC motor, in order to smoothly control the speed and rotation of the AC motor. The most common type is an AC/AC converter with b and output of AC power. Before the emergence of frequency converters, the application of adjusting the motor speed needed to be completed through a DC motor. Otherwise, it would need to use a built-in VS motor to reduce the actual speed of the motor during operation. The frequency converter simplifies the above work, reduces the equipment volume, and significantly reduces maintenance rates. However, there are high-frequency switching signals on the power and motor lines of the frequency converter, which can cause electromagnetic interference, However, the power factor on the b side of the frequency converter is generally poor, resulting in harmonics at the power supply end
The application range of frequency converters is very wide. From small household appliances to large mining grinders and compressors, about one-third of the b energy is consumed by electric motors that drive constant speed centrifugal pumps, fans, and compressors. However, the market penetration rate of weak frequency converters is still not high. The use of frequency converters to control the speed of electric motors brings significant improvement in energy efficiency, which is one of the main reasons for using frequency converters. Inverter technology is closely related to power electronics, including semiconductor switching components, inverter topology, control and simulation technology, as well as the advancement of control hardware and firmware.
