The disclosure discloses a novel arched commutator structure of a brush direct current motor, which comprises a round nut or a bolt, a pressing ring, a reinforcing ring, a sleeve, a commutator segment group and a mica ring. The effective part of the arched commutator is the commutator segment group consisting of commutator segments with V-shaped gaps at two ends and mica sheets; and the V-shaped groove of the commutator segment group is clamped by the V-shaped cone part of the pressing ring at one end and the V-shaped cone part of the sleeve at the other end. The advantages are: the deformation of the commutator caused by various acting forces generated in the operation process of the motor can be reduced and even prevented; the economic benefit generated every year cannot be estimated by taking a hundred million as a unit; materials are saved; the production cost is reduced.

A brush device includes a holder, a brush, a choke coil, and a terminal member. The holder includes a base extending in a direction orthogonal to an axial direction of an armature. The choke coil includes a core and a winding. The core extends in the axial direction of the armature and includes a first end surface in a longitudinal direction faced toward the base of the holder and a second end surface in the longitudinal direction located at a side opposite to the first end surface. The terminal member is coupled to the holder and connected to the winding. The terminal member includes a contact portion that is in contact with the second end surface of the core.

An electromagnetic interference (EMI) filter 32 is provided which is suitable for a DC motor 10. The EMI filter 32 comprises an EMI suppression circuit 34 having first and second DC-motor-terminal inputs 36a, 36b, and an MW-band power choke 44 coupled to one of the first and second DC-motor-terminal inputs 36a, 36b to increase the motor inductance in the MW frequency band.

Proposed is a motor having a flux ring in which the flux ring is fastened to a flux ring fastening part formed along the circumferential surface of a yoke.

The invention relates mainly to an assembly comprising a brush cage and a spiral spring (36), the spiral spring (36) comprising an axis (Y), a wound part (37) wound about the axis (Y) and an arm (39) extending from one end of the wound part (37), the brush cage comprising at least one lateral wall provided with an opening for the passage of the arm (39) through the lateral wall so that one end of the arm (39) can press against at least part of an end face of a brush, wherein the arm (39) comprises a first portion (391) of which the width (L5) measured along the axis (Y) is different from the width (L6) of the wound part (37) measured along the axis (Y) of the spiral spring (36).

A driver cabinet structure includes an upper driver cabinet, a lower driver cabinet, a motor front-end cover and a motor brush rack plate, wherein the motor front-end cover is disposed on the lower driver cabinet; the motor front-end cover is provided with the motor brush rack plate thereon and screw holes on a lateral surface; the motor brush rack plate is provided with brush holders thereon and a through hole in the center; front and rear ends of each of the brush holders are both open and intercommunicated; a limit step is disposed in the through hole; lug bosses are disposed on the limit step; and the lower driver cabinet, the motor front-end cover, the motor brush rack plate and the brush holders are integrally formed.

A brush ring assembly including a brush ring, a brush holder coupled to the brush ring, and a brush spring. The brush spring includes a coiled spring body, a first end portion and a second end portion. The first end portion and the second end portion are disposed on opposing ends of the spring body. The first end portion, the second end portion, and the coiled spring body are coupled to the brush holder. The first end portion is bent across at least a portion of the coiled spring body in a direction toward the second end portion.

A pump comprising a lower housing, a diaphragm assembly, an upper housing, a valve housing, and an o-ring is provided. The diaphragm assembly is positioned adjacent to the lower housing. The upper housing is positioned adjacent to the diaphragm assembly and includes an inlet chamber and an outlet chamber separated by a ring. The valve housing is positioned between the upper housing and the diaphragm assembly, encloses the inlet chamber and the outlet chamber, and includes a cutout in contact with the ring. The ring includes raised outer walls to receive the cutout and the o-ring is positioned between the raised outer walls of the ring and secured between the raised outer walls by the cutout.

This motor includes a yoke housing, a brush holder, a housing case and a circuit board. The brush holder holds a power supply brush and power supply terminals. The housing case has a board containing recess into which front end portions of the power supply terminals are inserted. The circuit board has terminals which are electrically connected to the power supply terminals within the board containing recess. The power supply terminals have terminal connection parts which linearly extend and are arranged in the board containing recess. The terminals are fork terminals which are electrically connected to the terminal connection parts. With respect to the terminal connection parts, portions closer to the base ends than terminal connected positions, where the terminals are connected, are covered by noise reduction member for reducing noise.

An electromagnetic interference (EMI) filter 32 is provided which is suitable for a DC motor 10. The EMI filter 32 comprises an EMI suppression circuit 34 having first and second DC-motor-terminal inputs 36a, 36b, and an MW-band power choke 44 coupled to one of the first and second DC-motor-terminal inputs 36a, 36b to increase the motor inductance in the MW frequency band.