CN113098176A - Rotating electrical machine - Google Patents
Rotating electrical machine Download PDFInfo
- Publication number
- CN113098176A CN113098176A CN202011499945.4A CN202011499945A CN113098176A CN 113098176 A CN113098176 A CN 113098176A CN 202011499945 A CN202011499945 A CN 202011499945A CN 113098176 A CN113098176 A CN 113098176A
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- China
- Prior art keywords
- connection portion
- stator
- connection
- coil
- phase
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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
-
- 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
-
- 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
Abstract
When a distributed winding type stator coil is configured by connecting a plurality of unit coils to each other, there is a problem that the assembly workability is deteriorated since the radial and circumferential distances between the plurality of connection portions are reduced for downsizing. Therefore, the first connection portions and the second connection portions that connect the coil side end portions of the unit coils to each other in the same phase are arranged at predetermined intervals on the circumferences of different diameters that are set in advance, the first connection portions of the plurality of phases are arranged at predetermined intervals in the circumferential direction of the stator coil, and the second connection portions of the plurality of phases are arranged closer to the outer periphery of the stator coil than the first connection portions, thereby securing an operation space.
Description
Technical Field
The present invention relates to a rotating electric machine.
Background
Rotating electric machines used in motors, generators, and the like are required to be small, high in output, and high in efficiency. In particular, in the motor for a vehicle, high output is more desirable as a driving source of the vehicle and miniaturization is more desirable due to the mounting on the vehicle. In order to increase the output of the vehicle motor, the sectional area of the coil assembled in the slot provided in the stator constituting the stator winding is increased as much as possible, and therefore, a structure is adopted in which the coil is formed into a distributed winding, and the cross section of the coil in the direction perpendicular to the axis of the coil is a rectangular cross section. The distributed winding is a structure in which a plurality of unit coils are wound across a plurality of slots and unit windings of different phases or the same phase are overlapped with each other at coil ends. By using the stator having the coils with distributed windings, the rotating magnetic field in the inner periphery of the stator can be made to approach a sine wave, and a high-output and low-noise rotating electric machine can be realized.
In addition, patent document 1 proposes a connection position of a plurality of unit coils for miniaturization. That is, in the conventional connection of the unit coils, since the end wires extending from the slot-housed portions are connected and arranged on the outer diameter side of the stator, in the case of coils of different phases, the potential difference between the connection portions arranged close to the connection portions becomes large, and therefore, it is necessary to secure the distance between the connection portions to such an extent that sufficient insulation can be maintained. However, if the distance between the connecting portions is sufficiently secured, the outer peripheral dimension of the stator becomes large, which causes a problem that the size of the stator becomes large. In view of the above problem, in the rotating electric machine shown in patent document 1, the connection portions of the unit coils are arranged to be spaced apart from each other by alternately positioning the connection portions at positions on the inner diameter side and the outer diameter side of the stator. This reduces the size of the outer periphery of the stator (the circumferential length), and thus the rotating electric machine can be reduced in size.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2011-182579
The structure of the rotating electric machine disclosed in patent document 1 is a structure in which a distance required for insulation between connection portions of unit coils of a stator is ensured in both the circumferential direction and the radial direction. However, since the distance in the circumferential direction can be reduced and the distance in the radial direction needs to be increased, the size cannot be sufficiently reduced, and since the connection portions are alternately arranged on the inner diameter side and the outer diameter side, the workability of the insertion operation of the assembly jig used when the terminal wires of the unit coils are joined is deteriorated, and the workability of the assembly is deteriorated.
Disclosure of Invention
The invention aims to provide a rotating electric machine which can further improve the operability of assembling a stator.
In the rotating electric machine of the present application, the stator includes: a stator core having a plurality of pole teeth and a plurality of slots arranged in a circumferential direction of an inner wall; and a stator coil formed by winding a single conductive wire around each of the unit coils of the stator coil, the unit coils having slot-housed portions housed in the slots and coil side end portions extending from the slot-housed portions, the coil side end portions including first connection portions and second connection portions formed by connecting the unit coils in the same phase with each other, the unit coils being mounted on the slots of the stator core and arranged offset in the circumferential direction of the stator core, the first connection portions of the phases being arranged in the circumferential direction of the stator coil at predetermined intervals at the coil side end portions, and the second connection portions of the phases being arranged closer to the outer periphery of the stator coil than the first connection portions.
According to the rotating electric machine disclosed in the present invention, since the connection portions of the unit coils used for the stator coil are arranged to be shifted in the radial direction, the interval between the connection portions can be made larger than when the connection portions are arranged only in the circumferential direction, so that the insertion of an assembly jig such as terminal wire bonding is facilitated, and the workability of assembly is improved.
Drawings
Fig. 1 is a perspective view of a stator according to a first embodiment of the present invention.
Fig. 2 is a plan view of a stator according to a first embodiment of the present invention.
Fig. 3 is a plan view of a stator according to a first embodiment of the present invention showing the arrangement of phases.
Fig. 4 is a sectional view of a stator according to the first embodiment of the present invention.
Fig. 5 is a sectional view of a stator according to a second embodiment of the present invention.
Fig. 6 is a sectional view of a stator according to a third embodiment of the present invention.
Fig. 7 is a sectional view of a stator according to a fourth embodiment of the present invention.
Fig. 8 is a sectional view of a stator according to a fifth embodiment of the present invention.
Fig. 9 is an enlarged view of a stator according to the first embodiment of the present invention.
Fig. 10 is an enlarged view of a stator according to a sixth embodiment of the present invention.
(symbol description)
1 stator
2 stator core
3 stator coil
4-unit coil
5 cutting groove containing part
6 coil side end
7 end line
8 first connection part
9 second connection part
Detailed Description
Implementation mode one
Fig. 1 is a perspective view showing a stator 1 of a rotating electric machine according to a first embodiment. The stator 1 is used for a rotating electric machine having a three-phase structure of U-phase, V-phase, and W-phase. The stator 1 includes: a stator core 2; and a distributed winding type stator coil 3 provided to the stator core 2. The stator core 2 is formed by stacking thin electromagnetic steel plates, and is fixed and assembled by caulking, bonding, welding, or the like so as not to be scattered. The stator core 2 is formed integrally with or in an annular shape by the split cores. The stator core 2 has a pole tooth portion formed with a plurality of slots, an insulating member is assembled to a side surface of the pole tooth portion, and the stator coil 3 covered with an insulating film is attached to the slot via the insulating member.
The stator coil 3 is constituted by a plurality of unit coils 4. The unit coil 4 has a slot-shaped housing portion 5 and a coil side end portion 6 extending from the slot-shaped housing portion 5, and includes a terminal wire 7 at the start of winding and a terminal wire 7 at the end of winding at the coil side end portion 6. The unit coils 4 are arranged in a plurality of positions spaced apart by a predetermined dimension in the circumferential direction (the direction indicated by arrow a in the drawing), and the slot-housed portions 5 are attached to the slots, so that the unit coils are arranged in an annular shape, and are assembled and connected to the plurality of slots of the stator core 2.
In the first embodiment, the stator coil 3 includes: a U-phase coil constituting a U-phase; a V-phase coil constituting a V-phase; and a W-phase coil constituting a W-phase. Each phase coil is formed of a plurality of unit coils 4. The unit coils 4 constituting the coils of the respective phases are assembled in the plurality of slots of the stator core 2 so as to cross the slots for different phases in which the coils of the other different phases are assembled and to be wound on the same core.
The tip of the terminal wire 7 extending from the upper portion of the coil side end portion 6 has a connection portion where an insulating coating is peeled off to expose a conductor portion, and the two or more terminal wires are electrically connected by Tig Welding (non-melting Inert Gas Welding) or laser Welding in a state of being overlapped. The connecting portion is arranged in an annular shape with a predetermined interval therebetween so that a chuck jig for grasping the end wire can be inserted from the radial direction at the time of welding.
As shown in fig. 1, in the stator 1, both the first connection portion 8 and the second connection portion 9 provided in each unit coil 4 are disposed on the upper end surface in the axial direction (the direction indicated by the arrow B in the drawing) of the stator core 2. The second connection portions 9 of adjacent unit coils 4 constituting a coil of a certain phase (for example, a "U-phase coil") among the plurality of unit coils 4 are connected to each other at a position close to the outer periphery of the stator core 2. The first connection portions 8 of the adjacent unit coils 4 constituting the same coil of a certain phase (for example, a "U-phase coil") are connected to each other at a position close to the inner periphery of the stator core 2. The above relationship is shown in fig. 2. In the figure, portions surrounded by circular marks are the first connection portion 8 and the second connection portion 9. The first connecting portions 8 are positioned at predetermined intervals on the circumference of the diameter L1, and the second connecting portions 9 are positioned at predetermined intervals on the circumference of the diameter L2. The second connection portion 9 is disposed in the vicinity of the outer periphery of the first connection portion 8 in the radial direction (the direction indicated by the arrow C in the figure), and the first connection portion 8 and the second connection portion 9 are provided at different positions in the radial direction, whereby the interval between the connection portions can be further increased, which is advantageous in improving workability of assembly such as joining of the terminal wire 7. Alternatively, the interval is increased by shifting in the radial direction, and the interval in the circumferential direction is decreased accordingly, so that the length (circumferential length) in the circumferential direction between the connection portions can be decreased, and the stator can be downsized.
Since the second connection portions 9 are arranged side by side in the radial direction of the stator 1 with respect to the first connection portions 8, the circumferential intervals of the connection portions can be increased, and the insertion of the chuck jig from the radial direction can be completed only once at the time of the assembling operation, which is advantageous for further improving the assembling property. Alternatively, the circumferential distance between the connection portions can be reduced by reducing the circumferential distance, thereby further reducing the size of the stator.
Fig. 3 shows a three-phase arrangement relationship in a plan view of the stator 1 of the rotating electric machine. As shown in fig. 3, the first connecting portion 8 is arranged in the order of U-phase, V-phase, W-phase, and W-phase counterclockwise as viewed from the top of the figure. Similarly, the second connection portion 9 is arranged clockwise in the order of U-phase, V-phase, and W-phase as viewed from the upper side of the figure.
The first connection portion 8 and the second connection portion 9 are arranged in a positional relationship such that the closest first connection portion 8 and the second connection portion 9 are in phase. That is, when the second connection portion 9 is the U-phase, the closest first connection portion 8 is the U-phase of the same phase, when the second connection portion 9 is the V-phase, the closest first connection portion 8 is the V-phase, and when the second connection portion 9 is the W-phase, the closest first connection portion 8 is the W-phase. By arranging as described above, the potential difference between the connection portions can be reduced, and the required insulation distance can be reduced. That is, since at least one or more of the plurality of first connection portions 8 adjacent to the second connection portion 9 is configured to be in phase with the second connection portion 9, the radial interval between the first connection portion 8 and the second connection portion 9 can be reduced while maintaining the insulation performance, and therefore, the outer diameter of the stator 1 can be reduced.
According to the stator 1 of the first embodiment, the first connection portion 8 and the second connection portion 9 of the adjacent unit coils 4 that constitute the same-phase coil are disposed at positions near the inner periphery and near the outer periphery of the stator core 2, respectively. Therefore, the interval between the adjacent connection portions can be made relatively wide for the plurality of connection portions (the first connection portion 8 and the second connection portion 9), and the possibility of interference with other connection portions is reduced at the time of connection operation, and the efficiency of connection operation can be improved. As shown in the cross-sectional view of fig. 4, the first connection portion 8 and the second connection portion 9 of the unit coil 4 in the first embodiment are linear shapes extending in the axial direction of the stator 1 from the root to the tip. Fig. 4 is a cross-sectional view taken along line X-Y shown in fig. 2, where X denotes the outer peripheral side of the stator 1 and Y denotes the inner peripheral side. The latter figures are also in the same relationship.
Second embodiment
While the first connection portion 8 and the second connection portion 9 of the unit coil 4 in the first embodiment have a linear shape as shown in fig. 4, the second connection portion 9 in the second embodiment has a tip end shape that is bent inward in the radial direction of the stator 1 as shown in fig. 5.
According to the second embodiment, the first connection portion 8 and the second connection portion 9 select the unit coils 4 of the same phase, and the second connection portion 9 is bent so as to straddle the coil side end portion 6 at the lower portion, thereby making it possible to reduce the interval between the tip end portions of the first connection portion 8 and the second connection portion 9. Therefore, the operating space can be enlarged, and the tip portion of the second connecting portion 9 is bent inward, so that the outer diameter of the stator 1 can be reduced.
Third embodiment
In contrast to the first embodiment, the positional relationship between the first connection portion 8 and the second connection portion 9 is replaced in the third embodiment. That is, as shown in fig. 6, the second connection portion 9 is disposed on the radially inner side of the stator 1 relative to the first connection portion 8, and the tip end shape of the first connection portion 8 is bent inward in the radial direction of the stator 1.
In the third embodiment, the same as the second embodiment, the unit coils 4 of the same phase are selected for the first connection portion 8 and the second connection portion 9 which are bent, and the first connection portion 8 is bent so as to straddle the coil side end portion 6 at the lower portion, thereby making it possible to reduce the interval between the second connection portion 9 and the tip end portion of the first connection portion 8. Therefore, the operating space can be enlarged, and the tip portion of the first connecting portion 8 is bent inward, so that the outer diameter of the stator 1 can be reduced.
Embodiment IV
In the fourth embodiment, as shown in fig. 7, the first connection portion 8 is bent outward in the radial direction of the stator 1, as compared to the first embodiment. In this case, the first connection portion 8 is disposed on the inner circumferential side of the stator 1, and the second connection portion 9 is disposed on the outer circumferential side of the stator 1.
In the fourth embodiment, the first connection portion 8 and the second connection portion 9 are selected and connected so as to be in phase, and the first connection portion 8 is bent so as to straddle the coil side end portion 6 at the lower portion, thereby making it possible to enlarge the inner diameter dimension of the stator 1, so that the space on the inner diameter side of the stator 1 is enlarged, and it is easy to arrange components such as a resolver.
Fifth embodiment
In the fifth embodiment, as shown in fig. 8, in contrast to the first embodiment, the second connection portion 9 is disposed on the radially inner peripheral side of the stator 1 with respect to the first connection portion 8, and the second connection portion 9 is bent outward in the radial direction of the stator 1. In the fifth embodiment, the first connection portion 8 and the second connection portion 9 are selected and connected so as to be in phase, and the second connection portion 9 is bent so as to cross the coil side end portion 6 at the lower portion as a base point, whereby the inner diameter dimension of the stator 1 can be enlarged, so that the space on the inner diameter side of the stator 2 is enlarged, and it is easy to dispose components such as a resolver.
In the fifth embodiment, the first connection portion 8 and the second connection portion 9 are connected so as to be in phase, and the second connection portion is bent so as to cross the coil side end portion at the lower portion as a base point, whereby the inner diameter dimension of the stator can be enlarged.
Sixth embodiment
In contrast to the first embodiment, in the sixth embodiment, the interval of the first connection portions 8 with respect to the first connection portions 9 in the same phase is smaller than the interval of the first connection portions 8 with respect to the first connection portions 9 in the different phase. That is, in the first embodiment, as shown in fig. 9, the first connection portion 8 and the second connection portion 9 are arranged at a predetermined equal interval.
In contrast, in the sixth embodiment, as shown in fig. 10, in the case of the same phase, the interval is narrower than that in the case of the different phase. For example, when the second connection portions 9 are V-phase, the interval between two V-phase and the second connection portions 9 among the adjacent three first connection portions 8 is small, and the interval between one U-phase is large. The potential difference between the connections in phase is smaller than that in phase, and the required insulation distance can be reduced. According to the above configuration, since the circumferential interval can be reduced as compared with the case where the first connection portions 8 are arranged at equal intervals, the circumferential length between the connection portions can be reduced, and the stator can be downsized while maintaining the insulation performance.
In each embodiment, as described above, the interval between the first connection portion 8 and the second connection portion 9 at the coil side end of the unit coil 4 can be set wide, so that the efficiency of the assembly operation can be improved.
While various exemplary embodiments and examples have been described in the present application, various features, modes, and functions described in one or more embodiments are not limited to the application to specific embodiments, and can be applied to the embodiments alone or in various combinations.
Therefore, countless modifications not illustrated are assumed to be within the technical scope disclosed in the present application. For example, the case where at least one component is modified, added, or omitted is included, and the case where at least one component is extracted and combined with the components of other embodiments is included.
Claims (8)
1. A rotating electrical machine is characterized in that,
the stator of the rotating electric machine includes: a stator core having a plurality of pole teeth and a plurality of slots arranged in a circumferential direction of an inner wall; and a stator coil composed of a plurality of unit coils,
the unit coils are formed by winding one conductive wire, each unit coil has a slot-housed portion housed in the slot and a coil side end portion extending from the slot-housed portion, and includes a first connection portion and a second connection portion at the coil side end portion, the first connection portion and the second connection portion being formed by connecting the unit coils of the same phase with each other, the plurality of unit coils are mounted on the slot of the stator core and are arranged offset in a circumferential direction of the stator core, the first connection portions of the plurality of phases are arranged at predetermined intervals in the circumferential direction of the stator coil at the coil side end portion, and the second connection portions of the plurality of phases are arranged closer to an outer periphery of the stator coil than the first connection portions.
2. The rotating electric machine according to claim 1,
at least one or more of the plurality of first connection portions adjacent to the second connection portion is in phase with the second connection portion.
3. The rotating electric machine according to claim 1,
the first connection portion and the second connection portion are arranged side by side in a radial direction of the stator.
4. The rotating electric machine according to claim 1,
the front end portion of the second connection portion is bent toward the radially inner side of the stator.
5. The rotating electric machine according to claim 1,
the first connection portion and the second connection portion are arranged in a reversed manner, the second connection portion is arranged on the inner circumferential side in the radial direction of the stator, and the front end portion of the first connection portion is bent toward the inner side in the radial direction of the stator.
6. The rotating electric machine according to claim 1,
the front end portion of the first connecting portion is bent toward the radial outer side of the stator.
7. The rotating electric machine according to claim 1,
the first connection portion and the second connection portion are arranged in a reversed manner, the second connection portion is arranged on the inner circumferential side in the radial direction of the stator, and the tip end portion of the second connection portion is bent toward the outer side in the radial direction of the stator.
8. The rotating electric machine according to claim 1,
the second connection portion is spaced less apart from the first connection portion of the same phase than the second connection portion is spaced from the first connection portion of the different phase.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019231117A JP6840217B1 (en) | 2019-12-23 | 2019-12-23 | Rotating machine |
| JP2019-231117 | 2019-12-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113098176A true CN113098176A (en) | 2021-07-09 |
Family
ID=74845239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011499945.4A Pending CN113098176A (en) | 2019-12-23 | 2020-12-17 | Rotating electrical machine |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6840217B1 (en) |
| CN (1) | CN113098176A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011182579A (en) * | 2010-03-02 | 2011-09-15 | Toyota Motor Corp | Rotary electric machine |
| US20120319512A1 (en) * | 2010-03-03 | 2012-12-20 | Nidec Corporation | Busbar unit and motor |
| CN103296797A (en) * | 2012-02-29 | 2013-09-11 | 株式会社丰田自动织机 | Stator of rotary electric machine |
| CN103326482A (en) * | 2012-03-21 | 2013-09-25 | 株式会社电装 | Rotary motor and method for manufacturing electric conductor segments |
| JP2016123247A (en) * | 2014-12-25 | 2016-07-07 | アイシン・エィ・ダブリュ株式会社 | coil |
| CN108711986A (en) * | 2018-08-08 | 2018-10-26 | 天津大西槐精密机械有限公司 | A kind of motor stator |
| CN109599996A (en) * | 2014-12-26 | 2019-04-09 | 日本电产株式会社 | The manufacturing method of motor and motor |
| US20190288574A1 (en) * | 2018-03-13 | 2019-09-19 | Ford Global Technologies, Llc | Hairpin winding electric machine with staggered haripin connections |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2602829B2 (en) * | 1987-04-23 | 1997-04-23 | 株式会社日立製作所 | Armature winding of rotating electric machine |
| JP2012080699A (en) * | 2010-10-04 | 2012-04-19 | Toyota Motor Corp | Rotating electric machine stator |
| EP3285369B1 (en) * | 2015-04-15 | 2022-06-15 | Mitsubishi Electric Corporation | Stator and electromotive machine |
| JP6173507B1 (en) * | 2016-03-04 | 2017-08-02 | 三菱電機株式会社 | Stator for rotating electric machine and method for manufacturing the same |
-
2019
- 2019-12-23 JP JP2019231117A patent/JP6840217B1/en active Active
-
2020
- 2020-12-17 CN CN202011499945.4A patent/CN113098176A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011182579A (en) * | 2010-03-02 | 2011-09-15 | Toyota Motor Corp | Rotary electric machine |
| US20120319512A1 (en) * | 2010-03-03 | 2012-12-20 | Nidec Corporation | Busbar unit and motor |
| CN103296797A (en) * | 2012-02-29 | 2013-09-11 | 株式会社丰田自动织机 | Stator of rotary electric machine |
| CN103326482A (en) * | 2012-03-21 | 2013-09-25 | 株式会社电装 | Rotary motor and method for manufacturing electric conductor segments |
| JP2016123247A (en) * | 2014-12-25 | 2016-07-07 | アイシン・エィ・ダブリュ株式会社 | coil |
| CN109599996A (en) * | 2014-12-26 | 2019-04-09 | 日本电产株式会社 | The manufacturing method of motor and motor |
| US20190288574A1 (en) * | 2018-03-13 | 2019-09-19 | Ford Global Technologies, Llc | Hairpin winding electric machine with staggered haripin connections |
| CN108711986A (en) * | 2018-08-08 | 2018-10-26 | 天津大西槐精密机械有限公司 | A kind of motor stator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2021100336A (en) | 2021-07-01 |
| JP6840217B1 (en) | 2021-03-10 |
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