CN107634414B - Commutator and motor - Google Patents
Commutator and motor Download PDFInfo
- Publication number
- CN107634414B CN107634414B CN201711009229.1A CN201711009229A CN107634414B CN 107634414 B CN107634414 B CN 107634414B CN 201711009229 A CN201711009229 A CN 201711009229A CN 107634414 B CN107634414 B CN 107634414B
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- Prior art keywords
- commutator
- segments
- reversing
- rotor winding
- threading
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- 239000010445 mica Substances 0.000 claims abstract description 19
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 19
- 238000004804 winding Methods 0.000 claims abstract description 18
- 238000000465 moulding Methods 0.000 claims abstract description 13
- 150000001875 compounds Chemical class 0.000 claims abstract description 12
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 12
- 230000003014 reinforcing effect Effects 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 10
- 239000000945 filler Substances 0.000 claims description 7
- 229920001187 thermosetting polymer Polymers 0.000 claims description 6
- 238000000641 cold extrusion Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000003466 welding Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 3
- 229910000881 Cu alloy Inorganic materials 0.000 description 2
- NEIHULKJZQTQKJ-UHFFFAOYSA-N [Cu].[Ag] Chemical compound [Cu].[Ag] NEIHULKJZQTQKJ-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 241000227287 Elliottia pyroliflora Species 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Landscapes
- Motor Or Generator Current Collectors (AREA)
Abstract
The application discloses a commutator and an electric machine provided with the same. The commutator comprises a plurality of commutator segments arranged at intervals along the circumferential direction, mica sheets arranged among the commutator segments, and molding compound for fixing the commutator segments and the mica sheets together; and a threading hole for penetrating into the rotor winding wire end is formed in the reversing piece. The commutator has good thermal stability (difficult to jump and discharge), light weight, small centrifugal force applied to the rotor winding wire end during high-speed rotation, good contact condition between the commutator and the electric brush during operation, and reduced commutation spark formation.
Description
Technical Field
The present application relates to a commutator and an electric machine provided with such a commutator.
Background
The commutator segment of the existing commutator has a step in the welding area with the rotor winding, and has a coil inserting groove for accommodating the winding wire end of the motor, and then the winding wire end and the commutator are welded together by spot welding procedure. There are the following disadvantages:
1. the spot welding process is not ideal, and the spot welding process is easy to be in cold joint or broken, and is an irreversible key process and a process which can not be thoroughly checked.
2. The utilization rate of the material is not high, and the commutator is subjected to slotting processing after molding, so that potential hidden danger is easily caused by the commutator.
3. The process of the manufacturing process is complicated
4. The brush abrasion and burn-in phenomenon can be easily caused by small steps on the commutator after subsequent assembly, such as the phenomenon of rotor running.
5. Because the original commutator segment is solid and has large weight, large surface runout can be generated under the conditions of high rotation, high temperature (the surface temperature of the commutator segment is higher during working) and high centrifugal force;
6. meanwhile, the high temperature generated in the running process of the motor can lead the commutating plates to be thermally expanded and deformed, so that the circle runout of the surface of the commutating plates is increased, and the service life and the energy generation of the motor are greatly influenced.
Disclosure of Invention
The purpose of the application is as follows: in view of the above problems, the present application provides a commutator with a more stable and reasonable structure and a motor equipped with the same.
The technical scheme of the application is as follows:
a commutator, comprising:
a plurality of commutating segments are arranged at intervals along the circumferential direction,
mica sheets arranged between the reversing sheets
A molding compound for fixing the reversing sheet and the mica sheet together;
and a threading hole for penetrating into the rotor winding wire end is formed in the reversing piece.
The commutator further comprises the following preferable schemes based on the technical scheme:
the hole axis of the threading hole is parallel to the axis of the reverser.
The threading hole is a through hole.
The threading hole and the commutator segment have the same length dimension in the axial direction of the commutator.
And the reinforcing ring is fixed with the reversing sheet, the mica sheet and the molding compound.
The reversing sheet, the mica sheet and the reinforcing ring are fixed together by means of thermosetting filler which is injection molded among the reversing sheet, the mica sheet and the reinforcing ring, and the thermosetting filler forms the molding compound after being cooled.
The outer surface of the reversing sheet in the radial direction of the reverser is a smooth arc surface.
The reversing sheet is formed by adopting a cold extrusion process.
The threading hole is a blind hole.
The motor comprises a rotor winding and is characterized by further comprising a commutator with the structure, and the wire end of the rotor winding penetrates into the threading hole and is fixed with the commutator segments through spot welding.
The application has the following beneficial effects:
1. the threading hole is formed in the reversing piece, and the thread end of the rotor winding penetrates through the threading hole and is fixed with the reversing piece in a spot welding mode in practical application, a wire embedding groove is not required to be formed, the integrity of the outer surface structure of the reversing piece can be guaranteed, and therefore the wear resistance of the reversing piece is improved, and the service life of the reversing piece is prolonged.
2. The commutator segment adopts a hollow structure with a threading hole, so that the material consumption of silver-copper alloy of the commutator segment is reduced, and the cost is reduced.
3. The commutator segment adopts a hollow structure with a threading hole, so that the weight of the motor rotor after the finished product is made is reduced, and the motor rotor can obtain higher rotating speed.
4. The commutator segment is formed by adopting a cold extrusion process, so that the commutator segment has good surface finish and uniform stress distribution, the surface hardness of the commutator segment is greatly improved, the friction coefficient between the commutator segment and the electric brush is reduced, the heating and the power loss of the motor are improved, and the motor performance is improved.
5. The thread ends of the rotor windings are threaded in the threading holes, the thread ends are radially supported by the walls of the threading holes, and the possibility that the thread ends are separated from the reversing pieces due to centrifugal force is reduced. And the thread ends of the rotor windings pass through the threading holes and are closer to the center of the commutator, and when the motor rotates, the centrifugal force action of the thread ends is smaller.
Drawings
The present application is further described with reference to the accompanying drawings and specific embodiments:
FIG. 1 is an axial cross-sectional view of a commutator in accordance with an embodiment of the present application;
FIG. 2 is an axial side view of a commutator in accordance with an embodiment of the present application;
FIG. 3 is an axial cross-sectional view of a commutator in a second embodiment of the present application;
fig. 4 is an axial side view of a commutator in a second embodiment of the present application.
Wherein: 1-bushing, 2-reversing piece, 2 a-threading hole, 3-mica piece, 4-molding compound and 5-reinforcing ring.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings by way of specific embodiments. This application may be embodied in many different forms and is not limited to the implementations described in this example. The following detailed description is provided to facilitate a more thorough understanding of the present disclosure, in which words of upper, lower, left, right, etc., indicating orientations are used solely for the illustrated structure in the corresponding figures.
Embodiment one:
fig. 1 and 2 show a preferred embodiment of a commutator of the type described herein, which, like conventional commutators, also comprises: a copper bush 1, a plurality of commutating segments 2 arranged at intervals along the circumferential direction on the periphery of the bush 1, and a mica sheet 3 arranged between the commutating segments, and a molding compound 4 for fixing the bush 1, the commutating segments 2 and the mica sheet 3 together.
The key improvement of this embodiment is that the inside of the above-mentioned commutator segment 2 is provided with a threading hole 2a for penetrating the rotor winding wire end. The whole commutator is not provided with a traditional coil inserting groove structure.
When the commutator of the embodiment is applied to a motor, the wire ends of the rotor windings penetrate into the threading holes 2a and are fixed with the commutator segments 2 through spot welding, and a wire embedding groove structure is not needed, so that the integrity of the outer surface structure of the commutator segments 2 can be ensured, the wear resistance of the commutator segments is enhanced, and the service life of the commutator segments is prolonged. And the thread ends of the rotor winding are penetrated in the threading holes 2a to radially support the thread ends, so that the possibility that the thread ends are separated from the reversing pieces due to the centrifugal force is reduced. And, the end of a thread of rotor winding wears in through wires hole 2a, and it is closer to the commutator center, and when the motor rotates, the centrifugal force effect that the end of a thread received is less.
Because the commutator segment 2 is made of silver-copper alloy, the price is relatively high, and the commutator segment 2 of the embodiment adopts a hollow structure with the threading holes 2a, so that the material and the weight of the commutator segment 2 are reduced, and the cost is reduced. Meanwhile, the weight of the motor rotor after the finished product is made is reduced due to the weight reduction of the commutating segment 2, so that the motor can obtain higher rotating speed.
In this embodiment, the outer surface of the commutator segment 2 in the radial direction of the bushing 1 (i.e., the radial direction of the commutator) is a smooth arc surface, and the commutator segment 2 is formed by adopting a cold extrusion process, so that the commutator segment has good surface smoothness and uniform stress distribution, and the surface hardness of the commutator segment is greatly improved. The reversing sheet 2 is a hollow section.
In this embodiment, the threading hole 2a is a through hole, and the hole axis of the threading hole 2a is arranged parallel to the axis of the bushing 1 (i.e., the axis of the commutator). The threading hole 2a and the commutator segment 2 have the same length dimension in the axial direction of the bushing 1.
In order to enhance the overall structural strength of the commutator segment, a reinforcing ring 5 which is fixed with the bushing 1, the commutator segment 2, the mica sheet 3 and the molding compound 4 is arranged around the periphery of the bushing 1. During manufacturing, the lining 1, the reversing sheet 2, the mica sheet 3 and the reinforcing ring 5 are fixed together by means of thermosetting fillers which are injected and molded among the lining 1, the reversing sheet 2, the mica sheet 3 and the reinforcing ring 5, the thermosetting fillers are cooled to form the molding compound 4, and the solidified molding compound 4 is used for fastening and combining the lining 1, the reversing sheet 2, the mica sheet 3 and the reinforcing ring 5 together. The reversing sheet plays a role in electrifying, the mica sheet and the filler play a role in insulating, and the reinforcing ring plays a role in reinforcing.
It should be noted that the bushing 1 mainly serves to strengthen the overall structure of the commutator, which is not a necessary structure of the commutator and may be omitted. Many commutators are copper-free bushings.
Embodiment two:
fig. 3 and 4 show another embodiment of the commutator of the present application, which has substantially the same structure as the first embodiment, the only difference being that: the threading hole 2a formed in the commutator segment 2 of the present embodiment is a blind hole structure, rather than the through hole structure in the first embodiment.
Of course, the foregoing embodiments are merely illustrative of the technical concept and features of the present application, and are intended to enable people to understand the content of the present application and implement the same, not to limit the protection scope of the present application. All equivalent changes or modifications made according to the spirit of the main technical solutions of the present application should be covered in the protection scope of the present application.
Claims (10)
1. A commutator, comprising:
a plurality of commutating segments (2) are arranged at intervals along the circumferential direction,
mica sheets (3) arranged between the reversing sheets, and
a molding compound (4) for fixing the reversing sheet (2) and the mica sheet (3) together;
it is characterized in that the method comprises the steps of,
threading holes (2 a) for penetrating into the rotor winding wire ends are formed in the reversing pieces (2).
2. Commutator according to claim 1, characterized in that the bore axis of the threading bore (2 a) is arranged parallel to the axis of the commutator.
3. Commutator according to claim 2, characterized in that the threading hole (2 a) is a through hole.
4. A commutator according to claim 3, characterized in that the threading hole (2 a) and the commutator segments (2) have the same length dimension in the direction of the commutator axis.
5. The commutator of claim 1, further comprising a reinforcing ring (5) fixed with the commutator segments (2), the mica sheets (3) and the molding compound (4).
6. Commutator according to claim 5, characterized in that the segments (2), mica sheets (3) and reinforcing rings (5) are fixed together by means of thermosetting filler injection-molded between the four, which thermosetting filler forms the molding compound (4) after cooling.
7. The commutator of claim 1, wherein the outer surface of the commutator segments (2) in the radial direction of the commutator is a smooth arc surface.
8. The commutator of claim 7, wherein the commutator segments (2) are formed by a cold extrusion process.
9. Commutator according to claim 1, characterized in that the threading hole (2 a) is a blind hole.
10. An electric machine comprising a rotor winding, characterized in that it further comprises a commutator as claimed in any one of claims 1 to 9, the ends of the rotor winding being threaded into the threaded holes (2 a) and spot-welded to the segments (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711009229.1A CN107634414B (en) | 2017-10-25 | 2017-10-25 | Commutator and motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711009229.1A CN107634414B (en) | 2017-10-25 | 2017-10-25 | Commutator and motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107634414A CN107634414A (en) | 2018-01-26 |
| CN107634414B true CN107634414B (en) | 2024-03-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711009229.1A Active CN107634414B (en) | 2017-10-25 | 2017-10-25 | Commutator and motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107634414B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001069724A (en) * | 1999-08-25 | 2001-03-16 | Asmo Co Ltd | Fixing structure for commutator segment in commutator |
| CN101227050A (en) * | 2008-01-23 | 2008-07-23 | 宋昌荣 | Improvement of commutator bar structure in commutalor |
| CN202308717U (en) * | 2011-09-20 | 2012-07-04 | 宁波市恒极机电有限公司 | Plug-type all-plastic reverser for starting motor |
| CN202513425U (en) * | 2012-04-27 | 2012-10-31 | 浙江三禾机电有限公司 | Novel motor commutator |
| CN104682152A (en) * | 2013-11-29 | 2015-06-03 | 常州五王电机有限公司 | Commutator |
| CN205051140U (en) * | 2015-10-30 | 2016-02-24 | 安固集团有限公司 | Commutator segment |
| CN207409775U (en) * | 2017-10-25 | 2018-05-25 | 锐奇控股股份有限公司 | Commutator and motor |
-
2017
- 2017-10-25 CN CN201711009229.1A patent/CN107634414B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001069724A (en) * | 1999-08-25 | 2001-03-16 | Asmo Co Ltd | Fixing structure for commutator segment in commutator |
| CN101227050A (en) * | 2008-01-23 | 2008-07-23 | 宋昌荣 | Improvement of commutator bar structure in commutalor |
| CN202308717U (en) * | 2011-09-20 | 2012-07-04 | 宁波市恒极机电有限公司 | Plug-type all-plastic reverser for starting motor |
| CN202513425U (en) * | 2012-04-27 | 2012-10-31 | 浙江三禾机电有限公司 | Novel motor commutator |
| CN104682152A (en) * | 2013-11-29 | 2015-06-03 | 常州五王电机有限公司 | Commutator |
| CN205051140U (en) * | 2015-10-30 | 2016-02-24 | 安固集团有限公司 | Commutator segment |
| CN207409775U (en) * | 2017-10-25 | 2018-05-25 | 锐奇控股股份有限公司 | Commutator and motor |
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| Publication number | Publication date |
|---|---|
| CN107634414A (en) | 2018-01-26 |
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