Brushed Direct Current Motor

Patent metadata

Field	Value
Publication number	US-2016190889-A1
Application number	US-201514985996-A
Country	US
Kind code	A1
Filing date	Dec 31, 2015
Priority date	Dec 31, 2014
Publication date	Jun 30, 2016
Grant date	—

Abstract

A brushed DC motor has a stator and a rotor. The stator has 2P magnetic poles, where P is an integer greater than 1. The rotor has a shaft, a rotor core, a commutator and a winding. The rotor core has m×P teeth, where m is an integer greater than 2. The winding includes several coil windings wound on the teeth and electrically connected to segments of the commutator. The commutator has 2m×P segments, where the 2m×P segments are divided into 2m groups, each group has P segments, the P segments are connected by an equalizer. The equalizer for at least one group of the 2m groups of segments and all the coil windings are formed by a single winding wire, wound continuously.

First claim

1 . A brushed DC motor, comprising:
a stator comprising 2P magnetic poles, wherein P is an integer greater than 1; a rotor rotatably mounted onto the stator, wherein the rotor comprises a shaft, a rotor core fixed to the shaft, a commutator and a winding; the rotor core has m×P teeth, m is an integer greater than 2; the commutator has 2m×P segments; the winding comprises several coil windings wound on the teeth and electrically connected to a respective segment, wherein the 2m×P segments are divided into 2m groups, each group has P segments, the P segments are connected conductively via one equalizer sequentially, and wherein the equalizer for at least one group of the 2m groups of segments and all of the coil windings are formed by a continuous winding wire.

2 . The motor of claim 1 , wherein each equalizer forms a closed loop.

3 . The motor of claim 1 , wherein all of the equalizers and all of the coil windings of the rotor are formed by the continuous winding wire.

4 . The motor of claim 3 , wherein each of the coil windings is wound on a respective tooth, and two ends of each of the coil windings wind around the shaft by a mechanical angle of 90 degrees and are hooked up to two corresponding segments respectively.

5 . The motor of claim 3 , wherein any two coil windings formed sequentially have opposite winding directions, wherein one of the coil windings is wound in a clockwise direction and the other of the coil windings is wound in a counter-clockwise direction.

6 . The motor of claim 3 , wherein two coil windings are wound on each of the teeth, and the two coil windings have opposite winding directions.

7 . The motor of claim 3 , wherein a few of the coil windings and all of the equalizers are formed alternately and the remaining coil windings are formed sequentially.

8 . The motor of claim 3 , wherein the stator has two electric brushes electrically connected to segments of the commutator, and six parallel branches are formed by the winding to be connected to the two electric brushes.

9 . The motor of claim 3 , wherein each of the segments is connected directly to two coil windings, and the two coil windings have opposite winding directions.

10 . The motor of claim 3 , wherein each of the coil windings comprises P sub-coils, the P sub-coils are wound on the P teeth of the rotor respectively; and a distance between two adjacent sub-coils among the P sub-coils is an even multiple of a pole pitch.

11 . The motor of claim 10 , wherein the stator has two electric brushes electrically connected to segments of the commutator, and two parallel branches are formed by the winding of the rotor to be connected to the two electric brushes.

12 . The motor of claim 10 , wherein all of the coil windings and all of the equalizers are formed alternately by the continuous winding wire.

13 . The motor of claim 10 , wherein some of the segments are connected directly to two coil windings, and the two coil windings have opposite winding directions.

14 . The motor of claim 1 , wherein P is equal to 3, and m is equal to 3.

15 . The motor of claim 1 , wherein the following relational expression is met for the electric brushes and the commutator of the stator:

W
b

<

D
c

·

sin


(

sin

-
1



(

δ

D
c

)

+

π

2



mP

)

wherein W b indicates a width of the electric brush in a rotational direction of the commutator;
D c indicates an outside diameter of the commutator; and
δ indicates a width of a gap between two adjacent segments of the commutator.

Assignees

• Johnson Electric Sa

Inventors

• Liu Fei
• Qin Rui Feng

Classifications

• H02K3/28 Primary

  Layout of windings or of connections between windings (windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32) · CPC title

• H02K2213/03

  Machines characterised by numerical values, ranges, mathematical expressions or similar information · CPC title

• H02K13/04

  Connections between commutator segments and windings · CPC title

• H02K13/006

  Structural associations of commutators · CPC title