Brush assembly and motor using same

Patent metadata

Field	Value
Publication number	US-10483829-B2
Application number	US-201715447750-A
Country	US
Kind code	B2
Filing date	Mar 2, 2017
Priority date	Mar 2, 2016
Publication date	Nov 19, 2019
Grant date	Nov 19, 2019

Abstract

A brush assembly includes a circuit board, at least two brushes, power connecting terminals for connecting with an external power supply, and a power supply branch circuit connected in series between a corresponding one of the power connecting terminals and a corresponding one of the brushes. The brush assembly further comprises an EMI suppressor connected between the power supply branch circuit and ground. The EMI suppressor is an axial capacitor formed by a conductor core, a cover, and a filling medium. The cover is attached around the conductor core, and the filling medium is filled between the conductor core and the cover. A motor utilizing the brush assembly is also provided.

First claim

The invention claimed is:

1. A motor comprising:
a housing,
a rotor assembly mounted in the housing,
a stator assembly mounted in the housing,
a commutator,
an end cap assembly mounted to one side of the housing; and
a brush assembly comprising:
a circuit board;
at least two brushes;

a plurality of power connecting terminals for connecting with an external power supply;
a power supply branch circuit connected in series between a corresponding one of the power connecting terminals and a corresponding one of the brushes; and
an EMI suppressor connected between the power supply branch circuit and ground, the EMI suppressor being an axial capacitor formed by a conductor core, a cover, and a filling medium;
wherein the end cap assembly comprises an end cap portion and a bearing seat, the end cap portion defines a first receiving chamber and a second receiving chamber at two sides thereof, and defines a through hole in communication with the first receiving chamber and the second receiving chamber, a bearing seat accommodating portion is defined in the first receiving chamber, the bearing seat comprises a plate member and a bearing sleeve disposed on the plate member, the plate member is disposed between the first receiving chamber and a bottom wall of the second receiving chamber, and the bearing sleeve is accommodated in the bearing seat accommodating portion.

2. The motor of claim 1 , wherein the cover is attached around the conductor core, the filling medium is filled between the conductor core and the cover.

3. The motor of claim 1 , wherein the rotor assembly comprises a shaft and a rotor core, one end of the shaft is rotatably received in the housing, and the other end sequentially passes through the rotor core and the commutator and is rotataly received in the end cap assembly; the commutator is mounted on the shaft, the commutator is electrically connected with the rotor assembly and slidably connected with the brush assembly to connect the rotor assembly to the external power supply.

4. The motor of claim 3 , wherein the brush assembly is mounted on the end cap assembly, and the bearing seat is configured to receive a bearing for supporting the rotor assembly for rotation in the bearing.

5. The motor of claim 4 , wherein the brush assembly further comprises at least two inductors, each inductor is connected in series to a corresponding power supply branch circuit, the two inductors are parallel to each other and are received in the first receiving chamber, and the two inductors are located at two sides of the bearing seat accommodating portion.

6. The motor of claim 4 , wherein a commutator accommodating portion and at least two brush holders are disposed in the second receiving chamber, the commutator accommodating portion is in communication with and coaxially arranged with the bearing seat accommodating portion, and the commutator is received in the commutator accommodating portion.

7. The motor of claim 6 , wherein the two brush holders are symmetrically disposed at a circumferential side of the commutator accommodating portion, each brush holder is in communication with the commutator accommodating portion.

8. The motor of claim 4 , wherein the brush assembly comprises at least one thermal switch connected between one corresponding brush and one corresponding EMI suppressor.

9. The motor of claim 8 , wherein a plurality of locking portions is disposed at the bottom wall of the second receiving chamber, the locking portions and the bottom wall and a sidewall of the second receiving chamber cooperatively define a receiving space, and the locking portions engage with the thermal switch to fix the thermal switch in the receiving space.

10. The motor of claim 4 , wherein a plurality of contacting tabs is disposed on the plate member, one side of the circuit board is provided with an earth line, some of the contacting tabs pass through the first receiving chamber to connect to the earth line, and some other contacting tabs are connected to the housing.

11. The motor of claim 4 , wherein the brush assembly comprises a sensor assembly mounted to one side of the circuit board, the sensor assembly comprises a Hall sensor, and the Hall sensor is connected to the external power supply.

12. The motor of claim 4 , wherein the end cap portion defines at least two through holes passing through the end cap portion and in communication with the first receiving chamber and the second receiving chamber, the plate member defines engagement holes coaxial with the through holes, and each EMI suppressor is received in one corresponding through hole and one corresponding coaxial engagement hole.

Assignees

• Johnson Electric Sa
• Johnson Electric Int Ag

Inventors

• Luo Qing Bin
• Lai Chi Wai
• Wei xin peng
• Tian gui hong
• Hu Bo
• Ren Xiao Lin
• Wu Wen Ming

Classifications

• H02K5/148 Primary

  Slidably supported brushes · CPC title

• H02K11/026 Primary

  Suppressors associated with brushes, brush holders or their supports · CPC title

• H02K11/02 Primary

  for suppression of electromagnetic interference · CPC title

• H02K11/25

  Devices for sensing temperature, or actuated thereby · CPC title

• H02K5/225

  Terminal boxes or connection arrangements (specially adapted for submersible motors H02K5/132) · CPC title