Patent ID: 8558429
Filing Date: 2013-10-15
Classification: H01R,H02K

Abstract:
1. A brush lifting system for an induction motor, comprising: a shaft in operable communication with a wound rotor induction motor (WRIM) rotor; a plurality of slip rings positioned radially around the shaft and in electrical communication with rotor windings of the WRIM; a plurality of brushes, wherein each of the plurality of brushes is to selectively contact a respective one of the plurality of slip rings; a plurality of selectively activating electrical contacts in electrical communication with respective terminals of the rotor windings of the WRIM; an actuating mechanism in operable communication with at least a portion of the plurality of brushes and the plurality of electrical contacts, wherein, when the actuating mechanism is actuated, at least a portion of the plurality of electrical contacts creates electrical shorts between at least a portion of the plurality of slip rings and the rotor windings of the WRIM and at least a portion of the plurality of brushes is lifted from contacting the plurality of slip rings; and a respective one of a plurality of brush holders associated with each of the plurality of brushes; wherein: the plurality of brushes is configured into groups of brushes; each of the brush holders of the groups of brushes is operably connected to a same one of a plurality of shafts; each brush of each group of brushes is aligned with a respective one of the plurality of slip rings for selective contact therewith; and the actuating mechanism is to selectively apply rotational movement to each of the brush holders about the plurality of shafts to selectively engage and disengage the respective group from the plurality of slip rings.