Controller įurther information: FAM control of induction motor Elevated-voltage stresses imposed on induction motors that are supplied by VFDs require that such motors be designed for definite-purpose inverter-fed duty in accordance with such requirements as Part 31 of NEMA Standard MG-1. Motors that are designed for fixed-speed operation are often used. Some types of single-phase motors or synchronous motors can be advantageous in some situations, but generally three-phase induction motors are preferred as the most economical. The AC electric motor used in a VFD system is usually a three-phase induction motor. System description and operation VFD systemĪ variable-frequency drive is a device used in a drive system consisting of the following three main sub-systems: AC motor, main drive controller assembly, and drive/operator interface. Strömberg managed to sell the idea of PWM drive to Helsinki metro in 1973 and in 1982 first PWM drive SAMI10 were operational. Martti Harmoinen is regarded the inventor of this technology. Pulse Width Modulating (PWM) variable frequency drive project started in the 1960s at Strömberg in Finland. VFDs include low- and medium-voltage AC-AC and DC-AC topologies. Since the 1980s, power electronics technology has reduced VFD cost and size and has improved performance through advances in semiconductor switching devices, drive topologies, simulation and control techniques, and control hardware and software. Systems using VFDs can be more efficient than hydraulic systems, such as in systems with pumps and damper control for fans. VFDs are used in applications ranging from small appliances to large compressors. Depending on its topology, it controls the associated voltage or current variation. Small variable-frequency drive Chassis of above VFD (cover removed)Ī variable-frequency drive (VFD, or adjustable-frequency drives, adjustable-speed drives, variable-speed drives, AC drives, micro drives, inverter drives, or drives) is a type of AC motor drive (system incorporating a motor) that controls speed and torque by varying the frequency of the input electricity.
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