CN114142650A - Stator, rotating electric machine, and method for manufacturing stator - Google Patents
Stator, rotating electric machine, and method for manufacturing stator Download PDFInfo
- Publication number
- CN114142650A CN114142650A CN202110869193.4A CN202110869193A CN114142650A CN 114142650 A CN114142650 A CN 114142650A CN 202110869193 A CN202110869193 A CN 202110869193A CN 114142650 A CN114142650 A CN 114142650A
- Authority
- CN
- China
- Prior art keywords
- stator
- coil
- radiator
- coil end
- conductive wire
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/08—Forming windings by laying conductors into or around core parts
- H02K15/085—Forming windings by laying conductors into or around core parts by laying conductors into slotted stators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines
-
- 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
- H02K3/24—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/38—Windings characterised by the shape, form or construction of the insulation around winding heads, equalising connectors, or connections thereto
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
- Manufacture Of Motors, Generators (AREA)
- Motor Or Generator Cooling System (AREA)
- Windings For Motors And Generators (AREA)
Abstract
The invention aims to provide a stator, a rotating electric machine and a method for manufacturing the stator, which can improve the heat dissipation capacity of a coil and the cooling efficiency of the coil. The stator (1) is disposed radially outward of the rotor at a distance. The stator (1) is formed in a ring shape. The outer peripheral portion of the stator (1) is fixed to the inner wall surface of the housing. The stator (1) includes a stator core (3) and a coil (4).
Description
Technical Field
The present invention relates to a stator, a rotating electric machine, and a method of manufacturing the stator.
Background
With the recent increase in output of rotating electrical machines, it is necessary to improve cooling techniques for cooling the magnetic coils that generate heat. Previously, it is known to cool the coil by dropping a refrigerant into the coil. There is a need for a method of maximizing the cooling effect of the coil as much as possible within a limited cost and space.
In response to the above-described demand, patent document 1 proposes a coil that is cooled by directly radiating heat from the coil by applying a heat conductive/heat radiating coating film to the coil surface.
[ Prior art documents ]
[ patent document ]
[ patent document 1] Japanese patent laid-open No. 2009-153366
Disclosure of Invention
[ problems to be solved by the invention ]
However, the conventional techniques cannot provide a coil that can achieve both heat dissipation and cooling efficiency.
Accordingly, an object of the present invention is to provide a stator, a rotating electric machine, and a method of manufacturing the stator, which improve heat dissipation of a coil and cooling efficiency of the coil.
[ means for solving problems ]
(1) A stator (for example, stator 1 in the embodiment) of an embodiment of the present invention is characterized by including: a stator core (e.g., stator core 3 in the embodiment); and a coil (e.g., coil 4 in the embodiment) attached to the stator core and having a coil end (e.g., coil end 42 in the embodiment) protruding from the stator core; and the coil end portion has a concave-convex portion (for example, concave-convex portion 31 in the embodiment) formed by adding a radiator (for example, radiator 30 in the embodiment) to a surface of the coil.
(2) The stator according to the item (1), wherein the heat radiator may be an insulator.
(3) The stator according to the item (1) or (2), wherein the heat radiating body may be a powder.
(4) The stator according to any one of the above (1) to (3), wherein the coil has a conductive wire (e.g., conductive wire 10 in an embodiment) and an insulating coating (e.g., insulating coating 20 in an embodiment) covering the conductive wire, and the insulating coating and the radiator may be formed of materials having the same composition.
(5) The stator according to the above (4), wherein the radiator is adhered to the surface of the coil by an adhesive.
(6) The stator according to the above (4) or (5), wherein the adhesive and the insulating film may be formed of a material having the same composition.
(7) A rotating electrical machine of an embodiment of the present invention is characterized by including the stator according to any one of the items (1) to (6).
(8) The method of manufacturing a stator according to an embodiment of the present invention includes: a coil mounting step (for example, coil mounting step S01 in the embodiment) of mounting a coil to a stator core; a temporary fixing step (for example, a temporary fixing step S02 in the embodiment) of temporarily fixing a powdered radiator to a coil end portion protruding from the stator core with an adhesive; and a varnish application step (for example, a varnish application step S03 in the embodiment) of applying varnish to the coil end portion after the temporary fixing step.
According to the aspect (1), the uneven portion is formed at the coil end by adding the radiator to the coil end. Therefore, the surface area of the coil end is larger than the surface area of the coil end in a state where the radiator is not attached. When the surface area of the coil end is increased, the amount of heat radiation from the coil end is increased, and the cooling efficiency of the coil can be improved.
According to the aspect (2), since the radiator is an insulator, the heat radiation performance of the coil can be improved, and the coil having high insulation performance can be manufactured. Further, according to the aspect (2), a stator having a higher output can be provided.
According to the aspect (3), since the heat radiator is made of powder, the concave-convex portions can be formed over the entire coil end portion, and the surface area of the coil end portion can be further increased. Further, since the uneven portion can be formed only by attaching the powder to the coil end portion, the stator in which the cooling efficiency of the coil is improved can be easily provided.
According to the aspect (4), since the insulating film and the radiator are formed of the same material, the heat radiation performance of the coil can be further improved, and the coil having higher insulating performance can be provided.
According to the aspect (5), since the radiator is bonded to the surface of the coil by the adhesive, the heat radiation performance can be further improved by further improving the adhesion between the radiator and the surface of the coil.
According to the aspect (6), since the adhesive and the insulating film are formed of the same material, the adhesiveness between the radiator and the coil surface can be further improved, and the coil having higher insulating performance can be provided.
According to the aspect (7), since the stator according to any one of the aspects (1) to (6) is included, a high-performance rotating electrical machine in which the heat dissipation amount of the coil and the cooling efficiency of the coil are improved can be provided.
According to the aspect (8), since the temporary fixing step of temporarily fixing the powdered radiator to the coil end portion with the adhesive and the varnish applying step of applying the varnish to the coil end portion after the temporary fixing step are included, the powdered radiator can be reliably fixed to the coil end portion. Therefore, a high-performance stator capable of improving the heat dissipation amount of the coil and the cooling efficiency of the coil over a long period of time can be provided. Further, a high-performance stator manufacturing method that improves the heat dissipation amount of the coil and the cooling efficiency of the coil can be provided.
[ Effect of the invention ]
According to the present invention, it is possible to provide a stator, a rotating electric machine, and a method of manufacturing the stator, in which the amount of heat radiation from the coil and the cooling efficiency of the coil are improved.
Drawings
Fig. 1 is a perspective view of a stator of the first embodiment.
Fig. 2 is an enlarged view of the coil end of the first embodiment.
Fig. 3 is an enlarged sectional view of the coil end of the first embodiment.
[ description of symbols ]
1: stator
3: stator core
4: coil
7: tooth
8: trough
10: conductive wire
11: weld part
20: insulating coating
30: heat sink
31: concave-convex part
32: varnish
41: coil insertion part
42: coil end
50: adhesive agent
100: rotating electrical machine
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(rotating electric machine)
Rotating electric machine 100 is a traveling motor mounted on a vehicle such as a hybrid vehicle or an electric vehicle. However, the configuration of the embodiment of the present invention is not limited to the motor for running, and may be applied to a motor for power generation or a motor for other applications, or a rotating electrical machine (including a generator) other than a vehicle.
The rotating electric machine 100 includes a stator 1, a housing (not shown), and a rotor (not shown). The housing accommodates the rotor and the stator 1. A refrigerant is accommodated in the casing. The rotor and the stator 1 are disposed inside the casing in a state in which a part thereof is immersed in the refrigerant. As the refrigerant, an Automatic Transmission Fluid (ATF) or the like, which is a working oil used for lubrication of a Transmission, power Transmission, or the like, can be preferably used.
The rotor is configured to be rotatable about an axis C. The rotor is rotatably attached to the housing via a bearing provided in the housing.
(stator)
Fig. 1 is an external perspective view of a stator 1.
The stator 1 is disposed radially outward of the rotor at a distance. The stator 1 is formed annularly. The outer peripheral portion of the stator 1 is fixed to the inner wall surface of the housing. The stator 1 includes a stator core 3 and a coil 4.
The stator core 3 is formed in a ring shape centering on the axis C. Teeth 7 are formed on the inner peripheral surface of stator core 3. The teeth 7 protrude radially inward from the inner circumferential surface of the stator core 3. The teeth 7 are provided in plurality in the circumferential direction. Grooves 8 are formed between the teeth 7, and the coils 4 described later are inserted into the grooves 8. The rotor is rotatably disposed inside the stator core 3 about an axis C.
In the following description, a direction along the axis C of the stator core 3 is referred to as an axial direction, a direction perpendicular to the axis C is referred to as a radial direction, and a direction around the axis C is referred to as a circumferential direction.
The coils 4 are mounted in the slots 8 of the stator core 3. Specifically, the plurality of coils 4 are inserted into the respective slots 8 from one side (lower side in fig. 1) in the axial direction in a state of being overlapped in the radial direction and the circumferential direction. The plurality of coils 4 are fixed to the stator core 3 by joining together tip portions of the coils 4 that protrude from the respective slots 8 toward the other side (upper side in fig. 1) in the axial direction. Of the coil 4, the portion inserted into the slot 8 is a coil insertion portion 41, and the portions protruding from the end surface of the stator core 3 toward one side and the other side in the axial direction are coil end portions 42.
The coil 4 includes a conductive wire 10, an insulating film 20, and a radiator 30 (see fig. 2).
In the coil 4, the conductive wire 10 is bent in a predetermined direction mainly at the coil insertion portion 41 and the coil end portion 42. For example, a U-shaped bent portion or a twisted portion when a tip portion protruding to the other side in the axial direction is twisted in the circumferential direction is formed in the coil insertion portion 41 and the coil end portion 42.
Fig. 2 is an enlarged view of the coil end 42 protruding to the other side in the axial direction.
The conductive wire 10 constitutes a core portion of the coil 4. The conductive wire 10 is a so-called flat wire formed in a linear shape having a rectangular cross section. The conductive wire 10 has a welded portion 11 at the tip of the coil end 42 protruding to the other side in the axial direction. The adjacent soldering portions 11 are electrically and physically bonded to each other by soldering.
Fig. 3 is an enlarged sectional view of the coil end 42 in the welded portion 11.
The insulating film 20 covers the outer periphery of the conductive wire 10. The insulating film 20 is formed of an insulating material such as resin. The insulating film 20 is formed over the entire length of the conductive wire 10 except for the vicinity of the soldering portion 11. In other words, the conductive wire 10 is exposed to the insulating film 20 in the vicinity of the soldering portion 11. The radiator 30 is coated on a portion of the conductive wire 10 exposed from the insulating film 20 and at least a portion of the insulating film 20.
The radiator 30 covers the conductive wire 10 exposed from the insulating film 20 and the insulating film 20 in the vicinity thereof. Specifically, the radiator 30 is fixed to the surface of the conductive wire 10 exposed from the insulating film 20 and the surface of the insulating film 20 in the vicinity thereof by the adhesive 50 and the varnish 32.
The heat radiator 30 is a powder. The powder radiators 30 may be formed in different sizes, or may have irregularities on the surface. Specifically, the heat radiator 30 is preferably a self-growing crystalline powder.
The heat radiator 30 is an insulator.
Specifically, the material of the radiator 30 is preferably excellent in insulation and heat transfer properties. Specifically, polyimide amide or a ceramic material is preferably used as the material of the heat radiator 30. SiC is preferably used as the ceramic material. The radiator 30 may be formed of the same material as the insulating film 20. The heat radiator 30 may be bonded to the surface of the coil 4 by an adhesive 50. The radiator 30 may be formed of the same material as the adhesive 50 and the insulating film 20.
(method of manufacturing stator)
Next, a method for manufacturing the stator 1 will be described.
The method of manufacturing the stator 1 includes: a coil mounting step S01, a temporary fixing step S02, and a varnish application step S03.
In the coil mounting step S01, the coil 4 is mounted on the stator core 3. Specifically, the plurality of coils 4 are inserted into the slots 8 in the axial direction. At this time, the plurality of coils 4 are inserted one by one in the radial direction in the single slot 8. Further, the plurality of coils 4 may be inserted into the slot 8 in a combined state.
In the temporary fixing step S02, the powdered radiator 30 is temporarily fixed to the coil end 42 protruding from the stator core 3 by the adhesive 50.
The varnish application step S03 is a step performed after the temporary fixing step S02. In the varnish coating step S03, the coil end 42 is coated with the varnish 32. That is, in the varnish coating step S03, the radiator 30 temporarily fixed to the coil end 42 is fixed.
(action, Effect)
According to the stator 1, the uneven portion 31 is formed in the coil end portion 42 by adding the radiator 30 to the coil end portion 42. Therefore, the surface area of the coil end 42 is larger than the surface area of the coil end in a state where the radiator is not attached. When the surface area of the coil end 42 is increased, the amount of heat radiation from the coil end 42 increases, and the cooling efficiency of the coil 4 can be improved.
According to the stator 1, since the heat radiator 30 is an insulator, the heat radiation performance of the coil 4 can be improved, and the coil 4 having high insulation performance can be manufactured. Therefore, according to the stator 1, a stator with higher output can be provided.
According to the stator 1, since the radiator 30 is a powder, the concave-convex portions 31 can be formed over the entire coil end 42, and the surface area of the coil end 42 can be further increased. Further, since the uneven portion 31 can be formed in the coil end 42 only by attaching the powder to the coil end 42, the stator 1 in which the cooling efficiency of the coil 4 is improved can be easily provided.
According to the stator 1, since the insulating film 20 and the radiator 30 are formed of the same material, the heat radiation performance of the coil 4 can be further improved, and the coil 4 having a higher insulating performance can be provided.
According to the stator 1, the radiator 30 is bonded to the surface of the coil 4 by the adhesive 50, and thus the heat radiation performance can be further improved by further improving the adhesiveness between the radiator 30 and the surface of the coil 4.
According to the stator 1, since the adhesive 50 and the insulating film 20 are formed of the same material, the adhesiveness between the radiator 30 and the surface of the coil 4 can be further improved, and the coil 4 having higher insulating performance can be provided.
According to the rotating electric machine 100, since the stator 1 is included, a high-performance rotating electric machine 100 in which the heat dissipation amount of the coil 4 and the cooling efficiency of the coil 4 are improved can be provided.
According to the method of manufacturing the stator 1, since the varnish coating step S03 is included after the temporary fixing step S02, the powdered radiator 30 can be reliably fixed to the coil end 42. Therefore, the high-performance stator 1 capable of improving the heat dissipation amount of the coil 4 and the cooling efficiency of the coil 4 over a long period of time can be provided. Further, a high-performance stator 1 manufacturing method that improves the heat dissipation amount of the coil 4 and the cooling efficiency of the coil 4 can be provided.
The technical scope of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.
The cross-sectional shape of the conductive wire 10 is not limited to a rectangular shape, and may be, for example, a circular shape.
In addition, the components in the above embodiments may be replaced with conventional components as appropriate without departing from the scope of the present invention, and the embodiments may be combined as appropriate.
Claims (9)
1. A stator, comprising:
a stator core; and
a coil mounted to the stator core and having a coil end portion protruding from the stator core; and is
The coil end portion has a concave-convex portion formed by adding a radiator to a surface of the coil.
2. The stator as claimed in claim 1, wherein the heat sink is an insulator.
3. The stator according to claim 1 or 2, wherein the heat sink is a powder.
4. The stator according to claim 1 or 2, wherein the coil has a conductive wire and an insulating coating film covering the conductive wire,
the insulating film and the radiator are formed of materials having the same composition.
5. The stator according to claim 3, wherein the coil has a conductive wire and an insulating coating film covering the conductive wire,
the insulating film and the radiator are formed of materials having the same composition.
6. The stator as claimed in claim 4, wherein the heat spreader is adhered to the surface of the coil by an adhesive.
7. The stator according to claim 6, wherein the adhesive and the insulating film are formed of materials having the same composition.
8. A rotating electric machine characterized by comprising the stator according to any one of claims 1 to 7.
9. A method of manufacturing a stator, comprising:
a coil mounting step of mounting a coil to the stator core;
a temporary fixing step of temporarily fixing a powdered radiator to a coil end portion protruding from the stator core with an adhesive; and
and a varnish application step of applying varnish to the coil end portion after the temporary fixing step.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-149207 | 2020-09-04 | ||
| JP2020149207A JP7217249B2 (en) | 2020-09-04 | 2020-09-04 | stator, rotating electric machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114142650A true CN114142650A (en) | 2022-03-04 |
Family
ID=80393502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110869193.4A Pending CN114142650A (en) | 2020-09-04 | 2021-07-30 | Stator, rotating electric machine, and method for manufacturing stator |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP7217249B2 (en) |
| CN (1) | CN114142650A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08205477A (en) * | 1995-01-31 | 1996-08-09 | Hitachi Ltd | Motor |
| US6525437B1 (en) * | 1999-08-26 | 2003-02-25 | Honda Giken Kogyo Kabushiki Kaisha | Rotating electrical machine stator |
| JP2005269782A (en) * | 2004-03-18 | 2005-09-29 | Nissan Motor Co Ltd | Stator structure of motor and manufacturing method of motor stator |
| DE102005058219A1 (en) * | 2004-12-23 | 2006-07-13 | Siemens Ag | Electrical machine inside closed housing has rotor and stator with cooled end windings coupled to a thermally conductive element |
| JP2011112563A (en) * | 2009-11-27 | 2011-06-09 | Hitachi Automotive Systems Ltd | Temperature sensor and dynamo-electric machine |
| JP2011139588A (en) * | 2009-12-28 | 2011-07-14 | Hitachi Automotive Systems Ltd | Rotary electric machine and method of manufacturing the same |
-
2020
- 2020-09-04 JP JP2020149207A patent/JP7217249B2/en active Active
-
2021
- 2021-07-30 CN CN202110869193.4A patent/CN114142650A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08205477A (en) * | 1995-01-31 | 1996-08-09 | Hitachi Ltd | Motor |
| US6525437B1 (en) * | 1999-08-26 | 2003-02-25 | Honda Giken Kogyo Kabushiki Kaisha | Rotating electrical machine stator |
| JP2005269782A (en) * | 2004-03-18 | 2005-09-29 | Nissan Motor Co Ltd | Stator structure of motor and manufacturing method of motor stator |
| DE102005058219A1 (en) * | 2004-12-23 | 2006-07-13 | Siemens Ag | Electrical machine inside closed housing has rotor and stator with cooled end windings coupled to a thermally conductive element |
| JP2011112563A (en) * | 2009-11-27 | 2011-06-09 | Hitachi Automotive Systems Ltd | Temperature sensor and dynamo-electric machine |
| JP2011139588A (en) * | 2009-12-28 | 2011-07-14 | Hitachi Automotive Systems Ltd | Rotary electric machine and method of manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7217249B2 (en) | 2023-02-02 |
| JP2022043752A (en) | 2022-03-16 |
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