Before the advent of inverters, the application of adjusting motor speed required the use of direct current motors, or else involved using VS motors with built-in couplings to reduce the actual motor speed during operation. The inverter has simplified this process, reducing the size of the equipment and significantly lowering maintenance rates. However, the power lines and motor leads of inverters contain high-frequency switching signals, which can cause electromagnetic interference. Additionally, the power factor at the input side of the inverter is generally poor, leading to harmonic currents at the power supply end.frequency converter" 或 "variable-frequency drive

The application scope of inverters is very wide, from small household appliances to large mining grinding machines and compressors. About one-third of the world's energy is consumed in the electric motors of constant-speed centrifugal pumps, fans, and compressors, and the market penetration rate of inverters is still not high. One of the main reasons for the significant improvement in energy efficiency is the use of inverters.

4. The technology of inverters is closely related to power electronics, including semiconductor switching elements, inverter topologies, control and simulation technology, and the progress of control hardware and firmware.