Scherbius Drive
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The Static Scherbius Drive provides the speed control of a wound rotor motor below synchronous speed. The portion of rotor AC power is converted into DC by a diode bridge. This motor drive has the ability of flow the power both in the positive as well as the negative direction of the injected voltage.[1]
The Scherbius Drive is an electrical drive system invented by Arthur Scherbius, a German engineer known for his work in electrical engineering and cryptography (he also invented the Enigma machine). This drive system is primarily associated with controlling the speed of electric motors, particularly asynchronous (induction) motors. It is closely related to the static Kramer drive.[2]