Brush assembly for electric motor
AssigneeJohnson Electric S.A.
InventorJames Ching Sik Lau
Life of this patent
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Abstract
A brush assembly for an electric motor comprises a brush for making sliding contact with a commutator, the brush being fitted to an end of an elongate resilient electrically conductive brush arm fixed to a brush mounting plate. The brush and brush arm are arranged to ensure that the brush contacts the commutator at a single point in the vicinity of a side face of the brush so that the resilient urgings of the brush arm causing the brush to bear on the commutator surface creates a lateral twist in the elongate brush arm.
Claims16
A brush assembly for an electric motor, the brush assembly comprising:
- a brush body for making sliding contact with a commutator;
- a brush holder;
- and
- elongate resiliently flexible electrically conductive brush arm supporting the brush body and electrically connecting the brush body to the brush holder, wherein
- the brush body contacts the commutator substantially at a single point which is laterally offset from a central plane of the brush body such that the resilient urgings of the brush body into contact with the commutator by the brush arm creates a twist in the brush arm.
A brush assembly for an electric motor, the brush assembly comprising:
- a brush body for making sliding contact with a commutator, the brush body including an upper face adapted to couple to the brush arm, a lower face adapted to make sliding contact with a commutator of the motor, first and second sides extending between the upper and lower faces and first and second end faces extending between the upper and lower faces and between the first and second sides;
- a brush holder;
- and
- an elongate resiliently flexible electrically conductive brush arm supporting the brush body and electrically connecting the brush body to the brush holder, wherein
- the brush body contacts the commutator at a position which is laterally offset from a central plane of the brush body such that the resilient urgings of the brush body into contact with the commutator by the brush arm creates a twist in the brush arm;
- the first and second sides of the brush body intersecting at a first axis which is substantially parallel to a central axis of the commutator;
- and
- the first and second end faces of the brush body intersecting at a second axis which is substantially perpendicular to the central axis of the commutator,
- the lower face having a single ridge extending between the first and second end faces and offset towards the first side.
Dependencies are inferred from the claim text.