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Small variable-frequency drive Chassis of above VFD (cover removed). A variable-frequency drive (VFD, or adjustable-frequency drive, adjustable-speed drive, variable-speed drive, AC drive, micro drive, inverter drive, variable voltage variable frequency 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 ...
Christian Pähr, a trained banker, recognized the enormous potential of that drive design and acquired the rights to the geared motor from the bankrupt estate of Obermoser AG. Despite economic and political turmoil, he founded the company "Süddeutsche-Elektromotoren-Werke" in 1931, known since 1971 as SEW-EURODRIVE.
In 1879, Milton Reeves invented a CVT (then called a variable-speed transmission) for use in sawmilling. In 1896, Reeves began fitting this transmission to his cars, [32] and the Reeves CVT was also used by several other manufacturers. The 1911 Zenith Gradua 6HP motorcycle used a pulley-based Gradua CVT.
A variable speed motor drive is a system that includes a motor that is continuously variable in speed. If the motor is generating electrical energy rather than using it, the motor drive could be called a generator drive but is often still referred to as a motor drive.
It is commonly used to provide variable speed drives. [9] [10] Applications ... Manufacturers of industrial fluid couplings include Voith, [14] Transfluid, [15] ...
A variable-speed drive (VSD) air compressor is an air compressor that takes advantage of variable-speed drive technology. This type of compressor uses a special drive to control the speed ( RPM ) of the unit, which in turn saves energy compared to a fixed speed equivalent. [ 1 ]
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