CN116599265A - Hairpin coil connection structure and connection method of motor hairpin winding - Google Patents
Hairpin coil connection structure and connection method of motor hairpin winding Download PDFInfo
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- CN116599265A CN116599265A CN202310517994.3A CN202310517994A CN116599265A CN 116599265 A CN116599265 A CN 116599265A CN 202310517994 A CN202310517994 A CN 202310517994A CN 116599265 A CN116599265 A CN 116599265A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacture Of Motors, Generators (AREA)
- Windings For Motors And Generators (AREA)
Abstract
The invention discloses a hairpin coil connecting structure and a hairpin coil connecting method of a motor hairpin winding, and aims to provide the hairpin coil connecting structure and the hairpin coil connecting method of the motor hairpin winding, which can reduce the axial size of a motor and further improve the structural compactness of the motor. The utility model provides a hairpin coil connection structure of motor hairpin winding, includes a plurality of hairpin coils, hairpin coil includes straight flange section and the section of bending, and wherein straight flange section inserts and establishes in motor stator core's inslot, and the section of bending is located the motor stator core outside, and the section of bending is formed by the tail end bending of straight flange section, and the terminal surface of the section of bending forms the conductor junction face, links to each other through conductor junction face butt between hairpin coil and the hairpin coil.
Description
Technical Field
The invention relates to the technical field of hairpin motors, in particular to a hairpin coil connection structure and a hairpin coil connection method of a motor hairpin winding.
Background
In recent years, in order to meet the demand of motor compactness, a hairpin motor has become a mainstream trend of development in the automotive industry, which can effectively reduce the axial dimension of the motor. The stator winding of the hairpin motor comprises a plurality of hairpin coils, the hairpin coils are formed by bending flat wires, the hairpin coils are shaped like hairpin, each hairpin coil is inserted into a groove of a motor stator core according to a set arrangement mode, and the hairpin coils are connected with each other through welding to form the required winding of the single-phase motor or the multi-phase motor.
As shown in fig. 5, the current hairpin coil 1 generally includes a straight section 1.1, a bent section 1.2 and a connecting section 1.6 connected in sequence. The bending section is formed by bending the tail end of the straight section, the connecting section is formed by bending the tail end of the bending section, and the tail end of the connecting section is provided with a bare conductor. The straight edge section of the hairpin coil is inserted into the slot of the motor stator core; the bending section and the connecting section are positioned at the outer side of the motor stator core, and the straight line section is parallel to the connecting section; the straight line section and the connecting section are distributed along the axial extension of the motor stator core. The hairpin coils are connected with each other through conductor welding on the connecting section to form the windings of the required single-phase motor or multiphase motor. In the prior hairpin coil connecting structure of the hairpin winding, conductors on connecting sections are welded and connected between the hairpin coils, and the connecting sections extend along the axial direction of the motor stator core and are distributed on the outer side of the end part of the motor stator core, so that the axial length of the motor stator is increased, the axial size of the hairpin motor is increased, and the motor is not beneficial to compact structure.
For example, chinese patent publication No. CN211239494U, entitled motor winding and motor stator, in which the hairpin coil and the hairpin coil in the motor winding of this application are also connected by welding conductors on the connection section, and the connection section extends along the axial direction of the motor stator core and is distributed outside the end of the motor stator core; it also suffers from the above-mentioned disadvantages.
Disclosure of Invention
The invention aims to provide a hairpin coil connecting structure and a hairpin coil connecting method of a motor hairpin winding, which can reduce the axial size of the motor and further improve the structural compactness of the motor.
The technical scheme of the invention is as follows:
the utility model provides a hairpin coil connection structure of motor hairpin winding, includes a plurality of hairpin coils, hairpin coil includes straight flange section and the section of bending, and wherein straight flange section inserts and establishes in motor stator core's inslot, and the section of bending is located the motor stator core outside, and the section of bending is formed by the tail end bending of straight flange section, and the terminal surface of the section of bending forms the conductor junction face, links to each other through conductor junction face butt between hairpin coil and the hairpin coil. Compared with the prior art that the hairpin coil of the hairpin winding is connected with the hairpin coil by adopting the conductor welding on the connecting section, the hairpin coil connecting structure of the scheme omits the connecting section formed by bending the tail end of the bending section, and directly forms a conductor connecting surface on the end surface of the bending section, so that the hairpin coil is connected with the hairpin coil by abutting the conductor connecting surface of the bending section, and then is welded and connected, and therefore, the length of the connecting section extending along the axial direction of the motor stator, which is brought by a welding process, can be effectively shortened, the axial dimension of the motor is reduced, and the structural compactness of the motor is further improved.
Preferably, the bending section is linear or arc-shaped. Therefore, the bending of the bending section is convenient to form, the conductor connecting surfaces of the bending section which are in a straight line shape or an arc shape are connected in an abutting mode, connection between the hairpin coil and the hairpin coil is achieved, and the axial size of the motor is reduced.
Preferably, the bent sections of the two hairpin coils which are connected in an abutting manner by the conductor connecting surface are in an inverted V shape. Thus, the axial dimension of the motor is reduced.
Preferably, the tail end of the bending section is provided with a bare conductor connecting section, the end face of the conductor connecting section forms the conductor connecting surface, and the conductor connecting sections of the two hairpin coils which are connected in an abutting mode through the conductor connecting surface are welded and connected. Therefore, the hairpin coil and the hairpin coil are guaranteed to be connected in an abutting mode through the conductor connecting surface of the bending section and welded into a whole.
Preferably, the device further comprises a conductive connecting sleeve, wherein the conductive connecting sleeve is sleeved on the conductor connecting sections of the two hairpin coils which are connected in an abutting mode through the conductor connecting surfaces, and the conductive connecting sleeve and the conductor connecting sections are welded into a whole. The conductive connecting sleeve can improve the connection reliability between the hairpin coil and the hairpin coil on one hand, and is convenient for welding; on the other hand, the contact area between the hairpin coil and the hairpin coil can be effectively increased.
Preferably, the inner wall of the conductive connecting sleeve is provided with solder. Thus, the welding connection of the conductive connecting sleeve and the conductor connecting section is facilitated.
A hairpin coil connection method of a motor hairpin winding sequentially comprises the following steps,
inserting the hairpin coils into slots of a motor stator core according to a set arrangement mode;
bending the tail end of the hairpin coil positioned at the outer side of the motor stator core to a designated position, forming a bending section at the outer side of the motor stator core, and forming a conductor connecting surface on the end surface of the bending section so as to enable the hairpin coil to be in butt connection with the hairpin coil through the conductor connecting surface;
the conductor connecting surfaces which are connected in an abutting mode are connected into a whole through welding. Compared with the prior art that the hairpin coil of the hairpin winding is connected with the hairpin coil by adopting the conductor welding on the connecting section, the hairpin coil connecting method omits the connecting section formed by bending the tail end of the bending section, directly forms a conductor connecting surface on the end surface of the bending section, enables the hairpin coil to be connected with the hairpin coil in an abutting mode through the conductor connecting surface of the bending section, and then is connected in a welding mode, and therefore the length of the connecting section extending along the axial direction of the motor stator, which is brought by a welding process, can be effectively shortened, the axial dimension of the motor is reduced, and the structural compactness of the motor is further improved.
Preferably, the hairpin coil comprises a straight-edge section, the straight-edge section is inserted into a groove of the motor stator core, the bending section is formed by bending the tail ends of the straight-edge section, and the bending sections of the two hairpin coils which are connected in an abutting mode through the conductor connecting surface are in an inverted V shape.
A hairpin coil connection method of a motor hairpin winding sequentially comprises the following steps,
inserting the hairpin coils into slots of a motor stator core according to a set arrangement mode;
bending the tail end of the hairpin coil positioned at the outer side of the motor stator core to a designated position, forming a bending section at the outer side of the motor stator core, wherein the tail end of the bending section is provided with a bare conductor connecting section, and the end surface of the conductor connecting section forms a conductor connecting surface so that the hairpin coil and the hairpin coil are in butt connection through the conductor connecting surface;
sleeving a conductive connecting sleeve on a conductor connecting section of two hairpin coils which are connected in an abutting mode through a conductor connecting surface;
and welding the conductive connecting sleeve and the conductor connecting section into a whole through welding. Compared with the prior art that the hairpin coil of the hairpin winding is connected with the hairpin coil by adopting the conductor welding on the connecting section, the hairpin coil connecting method omits the connecting section formed by bending the tail end of the bending section, directly forms a conductor connecting surface on the end surface of the bending section, enables the hairpin coil to be connected with the hairpin coil in an abutting mode through the conductor connecting surface of the bending section, and then is connected in a welding mode, and therefore the length of the connecting section extending along the axial direction of the stator core of the motor, which is brought by a welding process, can be effectively shortened, the axial size of the motor is reduced, and the structural compactness of the motor is further improved.
Preferably, the hairpin coil comprises a straight-edge section, the straight-edge section is inserted into a groove of the motor stator core, the bending section is formed by bending the tail ends of the straight-edge section, and the bending sections of the two hairpin coils which are connected in an abutting mode through the conductor connecting surface are in an inverted V shape.
The beneficial effects of the invention are as follows: compared with the prior art that the hairpin coil of the hairpin winding is connected with the hairpin coil by adopting the conductor welding on the connecting section, the hairpin coil connecting structure of the scheme omits the connecting section formed by bending the tail end of the bending section, and directly forms a conductor connecting surface on the end surface of the bending section, so that the hairpin coil is connected with the hairpin coil by abutting the conductor connecting surface of the bending section, and then is welded and connected, and therefore, the length of the connecting section extending along the axial direction of the motor stator, which is brought by a welding process, can be effectively shortened, the axial dimension of the motor is reduced, and the structural compactness of the motor is further improved.
Drawings
Fig. 1 is a schematic diagram showing a partial structure of an embodiment of a hairpin connection structure of a motor hairpin according to a first embodiment of the invention.
Fig. 2 is a schematic structural view of a hairpin coil of an embodiment of a hairpin connection structure of a motor hairpin according to an embodiment of the invention.
Fig. 3 is a schematic view showing a partial structure of another embodiment of a hairpin connection structure of a motor hairpin according to a first embodiment of the invention.
Fig. 4 is a schematic diagram showing a partial structure of a hairpin connection structure of a motor hairpin according to a second embodiment of the invention.
Fig. 5 is a schematic partial structure of a hairpin coil connection structure of a stator winding of a prior art hairpin.
In the figure:
the hairpin coil 1 comprises a straight bending section 1.1, a bending section 1.2, a conductor connecting surface 1.3, a conductor connecting section 1.4, a connecting section 1.5 and a connecting section 1.6;
and a conductive connecting sleeve 2.
Detailed Description
The invention is described in further detail below with reference to the attached drawings and detailed description:
in a first embodiment, as shown in fig. 1 and 2, a hairpin coil connection structure of a motor hairpin winding includes a plurality of hairpin coils 1. The hairpin coil comprises a straight bending section 1.1 and a bending section 1.2, wherein the straight bending section is inserted into a groove of the motor stator core, and the bending section is positioned at the outer side of the motor stator core. The bending section is formed by bending the tail end of the straight-edge section. The end surfaces of the bent sections form conductor connection surfaces 1.3. The hairpin coil is connected with the hairpin coil in an abutting mode through a conductor connecting surface.
Compared with the prior art that the hairpin coil of the hairpin winding is connected with the hairpin coil by adopting the conductor welding on the connecting section, the hairpin coil connecting structure of the embodiment omits the connecting section formed by bending the tail end of the bending section, and directly forms a conductor connecting surface on the end surface of the bending section, so that the hairpin coil is connected with the hairpin coil by abutting the conductor connecting surface of the bending section, and then is welded and connected, and therefore, the length of the connecting section extending along the axial direction of the stator core of the motor, which is brought by a welding process, can be effectively shortened, the axial dimension of the motor is reduced, and the structural compactness of the motor is further improved.
Specifically, the end of the bent section 1.2 has a bare conductor connecting section 1.4. The end faces of the conductor connecting sections form said conductor connecting faces 1.3. The conductor connecting sections of the two hairpin coils which are connected in an abutting mode through the conductor connecting surfaces are welded and connected. Therefore, the hairpin coil and the hairpin coil are guaranteed to be connected in an abutting mode through the conductor connecting surface of the bending section and welded into a whole.
Further, as shown in fig. 1 and 2, the bending section 1.2 is in a straight line shape or an arc shape. In this embodiment, the bending section is in a straight line, and the bending section and the conductor connecting section are distributed on the same straight line. Therefore, the bending of the bending section is convenient to form, the conductor connecting surfaces of the bending section which are in a straight line shape or an arc shape are connected in an abutting mode, connection between the hairpin coil and the hairpin coil is achieved, and the axial size of the motor is reduced.
Further, as shown in fig. 1, the bent sections 1.2 of the two hairpin coils connected by the conductor connection surface are in an inverted V shape. Thus, the axial dimension of the motor is reduced.
In one implementation manner of this embodiment, as shown in fig. 1 and fig. 2, the same hairpin coil 1 includes two folded-straight sections 1.1 parallel to each other, one ends of the two folded-straight sections are connected by a connecting section 1.5, and the folded-straight sections 1.2 are in one-to-one correspondence with the folded-straight sections. The folding straight section, the connecting section and the folding section are of an integral folding forming structure. In this embodiment, the bending sections are located on the same side of the motor stator core. The other parts of the hairpin coil except the conductor connecting section are covered by an insulating layer. The hairpin coils are connected with each other in an abutting mode through the conductor connecting surface and welded into a whole.
In another implementation manner of this embodiment, as shown in fig. 3, the same hairpin 1 includes a straight section 1.1, and both ends of the straight section have a bent section 1.2. In this embodiment, the bent sections at both ends of the straight section are located at both ends of the motor stator core. The other parts of the hairpin coil except the conductor connecting section are covered by an insulating layer. The hairpin coils are connected with each other in an abutting mode through the conductor connecting surface and welded into a whole.
In the second embodiment, the rest of the structure of the present embodiment is different from that of the first embodiment in that,
as shown in fig. 4, a hairpin connection structure of a motor hairpin further includes a conductive connection sleeve 2. The conductor connecting sections of the two hairpin coils which are connected in an abutting mode through the conductor connecting surfaces are sleeved with the conductive connecting sleeve 2. The conductive connecting sleeve and the conductor connecting section are welded into a whole. The conductive connecting sleeve can improve the connection reliability between the hairpin coil and the hairpin coil on one hand, and is convenient for welding; on the other hand, the contact area between the hairpin coil and the hairpin coil can be effectively increased.
In this embodiment, the inner hole of the conductive connecting sleeve is splayed.
The inner wall of the conductive connecting sleeve is provided with solder. Thus, the welding connection of the conductive connecting sleeve and the conductor connecting section is facilitated.
In a third embodiment, a hairpin coil connection method of a motor hairpin winding, where a hairpin coil connection structure of the motor hairpin winding in this embodiment refers to the first embodiment.
A hairpin coil connection method of a motor hairpin winding sequentially comprises the following steps,
the hairpin coil is inserted into the slot of the motor stator core according to a set arrangement mode, and concretely comprises a straight-edge section, and the straight-edge section of the hairpin coil is inserted into the slot of the motor stator core.
The tail end of the hairpin coil positioned at the outer side of the motor stator core is bent to a designated position, a bending section is formed at the outer side of the motor stator core, and specifically, the tail end of the straight edge section of the hairpin coil positioned at the outer side of the motor stator core is bent to a designated position, and a bending section is formed at the outer side of the motor stator core. The end face of the bending section forms a conductor connecting surface so that the hairpin coil is connected with the hairpin coil in an abutting mode through the conductor connecting surface.
The conductor connecting surfaces which are connected in an abutting mode are connected into a whole through welding. The bent sections of the two hairpin coils which are connected in an abutting mode through the conductor connecting surface are in an inverted V shape. Compared with the prior art that the hairpin coil of the hairpin winding is connected with the hairpin coil by adopting the conductor welding on the connecting section, the hairpin coil connecting method omits the connecting section formed by bending the tail end of the bending section, directly forms a conductor connecting surface on the end surface of the bending section, and enables the hairpin coil to be connected with the hairpin coil in an abutting mode through the conductor connecting surface of the bending section, and then is connected in a welding mode, so that the length of the connecting section extending along the axial direction of the stator core of the motor, which is brought by a welding process, can be effectively shortened, the axial size of the motor is reduced, and the structural compactness of the motor is further improved.
In a fourth embodiment, a hairpin connection method of a hairpin winding of a motor is described, and a hairpin connection structure of the hairpin winding of the motor in this embodiment refers to the second embodiment.
A hairpin coil connection method of a motor hairpin winding sequentially comprises the following steps,
inserting the hairpin coils into slots of a motor stator core according to a set arrangement mode; specifically, the hairpin coil comprises a straight-edge section, and the straight-edge section of the hairpin coil is inserted into a slot of the motor stator core.
The tail end of the hairpin coil positioned at the outer side of the motor stator core is bent to a designated position, a bending section is formed at the outer side of the motor stator core, and specifically, the tail end of the straight edge section of the hairpin coil positioned at the outer side of the motor stator core is bent to a designated position, and a bending section is formed at the outer side of the motor stator core. The tail end of the bending section is provided with a bare conductor connecting section, and the end face of the conductor connecting section forms a conductor connecting surface so that the hairpin coil is connected with the hairpin coil in an abutting mode through the conductor connecting surface.
And a conductive connecting sleeve is sleeved on the conductor connecting sections of the two hairpin coils which are connected in an abutting mode through the conductor connecting surfaces.
And welding the conductive connecting sleeve and the conductor connecting section into a whole through welding. The bent sections of the two hairpin coils which are connected in an abutting mode through the conductor connecting surface are in an inverted V shape.
Compared with the prior art that the hairpin coil of the hairpin winding is connected with the hairpin coil by adopting the conductor welding on the connecting section, the hairpin coil connecting method omits the connecting section formed by bending the tail end of the bending section, directly forms a conductor connecting surface on the end surface of the bending section, and enables the hairpin coil to be connected with the hairpin coil in an abutting mode through the conductor connecting surface of the bending section, and then is connected in a welding mode, so that the length of the connecting section extending along the axial direction of the motor stator, which is brought by a welding process, can be effectively shortened, the axial dimension of the motor is reduced, and the structural compactness of the motor is further improved.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent transformation of the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a hairpin coil connection structure of motor hairpin winding, includes a plurality of hairpin coils, characterized by, hairpin coil includes straight flange section and the section of bending, and wherein straight flange section inserts and establishes in motor stator core's inslot, and the section of bending is located the motor stator core outside, and the section of bending is bent by the tail end of straight flange section and is formed, and the terminal surface of the section of bending forms the conductor junction surface, links to each other through conductor junction surface butt between hairpin coil and the hairpin coil.
2. The hairpin connection structure of a motor hairpin of claim 1 wherein the bent segment is linear or arcuate.
3. A hairpin connection structure of a motor hairpin according to claim 1 or 2 wherein the bent sections of two hairpin coils connected in abutment by the conductor connection face are inverted V-shaped.
4. A hairpin connection structure of a motor hairpin according to claim 1 or 2 wherein the ends of the bent sections have exposed conductor connection sections, the end faces of which form the conductor connection faces, and the conductor connection sections of two hairpin coils connected by abutment are welded together.
5. The hairpin connection structure of claim 4 further comprising a conductive connecting sleeve, wherein the conductive connecting sleeve is sleeved on the conductor connecting section of the two hairpin coils connected by the conductor connecting surface, and the conductive connecting sleeve and the conductor connecting section are welded into a whole.
6. The hairpin connection structure of claim 5 wherein the inner wall of the conductive sleeve is provided with solder.
7. A hairpin coil connection method of a motor hairpin winding is characterized by comprising the following steps in sequence,
inserting the hairpin coils into slots of a motor stator core according to a set arrangement mode;
bending the tail end of the hairpin coil positioned at the outer side of the motor stator core to a designated position, forming a bending section at the outer side of the motor stator core, and forming a conductor connecting surface on the end surface of the bending section so as to enable the hairpin coil to be in butt connection with the hairpin coil through the conductor connecting surface;
the conductor connecting surfaces which are connected in an abutting mode are connected into a whole through welding.
8. The method for connecting hairpin coils of motor hairpin winding according to claim 7 wherein the hairpin coils include straight sections inserted into slots of motor stator core, the bent sections are formed by bending tail ends of the straight sections, and bent sections of two hairpin coils connected by conductor connection face are in inverted V shape.
9. A hairpin coil connection method of a motor hairpin winding is characterized by comprising the following steps in sequence,
inserting the hairpin coils into slots of a motor stator core according to a set arrangement mode;
bending the tail end of the hairpin coil positioned at the outer side of the motor stator core to a designated position, forming a bending section at the outer side of the motor stator core, wherein the tail end of the bending section is provided with a bare conductor connecting section, and the end surface of the conductor connecting section forms a conductor connecting surface so that the hairpin coil and the hairpin coil are in butt connection through the conductor connecting surface;
sleeving a conductive connecting sleeve on a conductor connecting section of two hairpin coils which are connected in an abutting mode through a conductor connecting surface;
and welding the conductive connecting sleeve and the conductor connecting section into a whole through welding.
10. The method for connecting hairpin coils of motor hairpin windings according to claim 9, wherein the hairpin coils include straight sections inserted into slots of the motor stator core, the bent sections are formed by bending tail ends of the straight sections, and bent sections of the two hairpin coils connected by abutting conductor connecting surfaces are in inverted V shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310517994.3A CN116599265A (en) | 2023-05-09 | 2023-05-09 | Hairpin coil connection structure and connection method of motor hairpin winding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310517994.3A CN116599265A (en) | 2023-05-09 | 2023-05-09 | Hairpin coil connection structure and connection method of motor hairpin winding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116599265A true CN116599265A (en) | 2023-08-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310517994.3A Pending CN116599265A (en) | 2023-05-09 | 2023-05-09 | Hairpin coil connection structure and connection method of motor hairpin winding |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116599265A (en) |
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2023
- 2023-05-09 CN CN202310517994.3A patent/CN116599265A/en active Pending
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