Patent ID: 9257887
Filing Date: 2016-02-09
CPC Classification: H01R,H02K

Claim Text:
1. A direct current motor, comprising: a rotor comprising: a shaft, a rotor core fixed to the shaft, a plurality of permanent magnets fixed to the rotor core, and a commutator; a stator comprising a stator core surrounding the rotor core, and a plurality of coils wound on the stator core; and brush gear comprising a plurality of commutating brushes connected to corresponding coils, a first pole brush, and a second pole brush; wherein the commutator comprises a substantially cylindrical insulating base fixed to the shaft, a first member fixed to the base, and a second member fixed to the base and insulated from the first member; the first member comprises a first slip ring extending radially to form a first planar surface and a plurality of first bars electrically connected and substantially perpendicularly to the first planar surface, the first pole brush making continuously sliding contact with the first planar surface; the second member comprises a second slip ring extending radially to form a second planar surface and a plurality of second bars electrically connected and substantially perpendicularly to the second planar surface, the second pole brush making continuously sliding contact with the second planar surface; and the first bars and the second bars are fixed to the outer surface of the base and are alternately arranged at equally spaced intervals in the circumferential direction of the base and form a substantially cylindrical surface against which the commutating brushes make sliding contact, wherein the brush gear further comprises a substantially ring-shaped brush card, wherein the ring-shaped brush card comprises a ring shaped bottom plate and a ring-shaped protrusion rising from a top surface of the bottom plate, and wherein the protrusion defines a plurality of first slots, a second slot, and a third slot, the commutating brushes are received in corresponding first slots, the first pole brush and the second pole brush are respectively housed in the second and third slots.