A variable-frequency drive (VFD, or adjustable-frequency drive, adjustable-speed drive, variable-speed drive, AC drive, micro drive, inverter drive, or drive) is a type of AC motor drive (system incorporating a motor) that controls speed and torque by varying the frequency of the input electricity. Depending on its topology, it controls the associated voltage or current variation.
VFDs are used in applications ranging from small appliances to large compressors. Systems using VFDs can be more efficient than hydraulic systems, such as in systems with pumps and damper control for fans.
As a leading supplier of VFDs, Veichi manufactures and produces a wide range of inverter drives. From low voltage frequency inverters to medium AC drives, complete in all specifications. Veichi AC adjustable frequency inverters are developed with advanced control algorithm such as vector control, tension control, V/F control, PID control and more motor control techniques of industry leading level. Besides, the random carrier, rotational speed tracking and more functionality are on the top-level of electrical industry.