Patent ID: 8040016
Filing Date: 2011-10-18
Classification: H01R

Abstract:
1. A brush ( 10 ) adapted to come into contact with conductive plates ( 12 ) arranged on a commutator ( 11 ) of an electric motor, the brush comprising a polar covering control means ( 15 ) between the beginning of the motor lifespan and its condition of stabilized operation, the control means comprising a contact zone ( 13 ) disposed between first and second formed zones ( 15 ), at least a portion of the contact zone centered with respect to the brush for contacting the commutator plates ( 12 ), and the said formed zones being adapted to reduce the polar covering (α) of the brush to values lower than 360°/P, with P being the number of commutator plates, in the beginning of the motor lifespan, and to maintain a polar covering at values above 360°/P during a stabilized operational condition of the motor, wherein the brush contacts two commutator plates in the beginning of the lifespan, and the brush contacts three commutator plates during the stabilized operational condition.