Generally, a device that converts fixed-frequency and fixed-voltage AC power (mains frequency) into variable voltage or variable frequency AC power is called a "variable frequency drive (VFD)". Among various motor speed control technologies, AC motor speed control using variable frequency technology has become the primary method of electric drive due to its advantages such as high precision, large torque, strong functionality, high reliability, and high power output.

From a structural perspective, the architecture of a VFD is generally AC-DC-AC, meaning it first rectifies single-phase or three-phase AC voltage into DC voltage (AC-DC), and then inverts the DC voltage into three-phase AC voltage at the desired frequency (DC-AC). See the diagram below for details:

Currently, VFDs are widely used in light and heavy industries, as well as in daily life. They are commonly applied in industries such as steelmaking, non-ferrous metals, petroleum, petrochemicals, chemicals, chemical fibers, textiles, machinery, electronics, building materials, coal, pharmaceuticals, papermaking, plastics, cigarette manufacturing, elevators (including escalators), overhead cranes (including harbor cranes), urban water supply (including sewage treatment), central air conditioning systems, and household appliances.

Changsha Sunye Electric Co., Ltd. (established in 2010 in Changsha, and Shenzhen Sunye Electric Co., Ltd. established in 2002) is a national high-tech enterprise specializing in R&D, manufacturing, and sales of inverters, industry-specific integrated machines, servo drives, and new energy products.

Sunye Electric owns independent intellectual property rights, and its products have passed certifications from national authoritative institutions, obtaining multiple software copyrights and IP certificates. Every year, substantial funds are invested in the research and development of new technologies and products, with several patents and software copyrights approved.

The company possesses core platform technologies such as construction hoist drivers, high-performance vector inverters, servo drives, and permanent magnet synchronous motor control. Medium- and low-voltage inverters and servo drives are widely used in industries including lifting, stone processing, HVAC, machine tools, metal products, wire and cable, plastics, printing and packaging, textile and chemical fibers, building materials, metallurgy, coal mining, municipal services, and automotive manufacturing.

Nowadays, Changsha Sunye Electric Co., Ltd. warmly invites cooperation from partners across all sectors. If you require technical products such as construction hoist drivers, high-performance vector inverters, servo drives, or permanent magnet synchronous motor control solutions, please feel free to contact us!