CN111371222A - Stator winding, stator with same, motor and vehicle - Google Patents
Stator winding, stator with same, motor and vehicle Download PDFInfo
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- CN111371222A CN111371222A CN202010311234.3A CN202010311234A CN111371222A CN 111371222 A CN111371222 A CN 111371222A CN 202010311234 A CN202010311234 A CN 202010311234A CN 111371222 A CN111371222 A CN 111371222A
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- 238000004804 winding Methods 0.000 title claims abstract description 89
- 239000011295 pitch Substances 0.000 claims abstract description 55
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 29
- 230000007935 neutral effect Effects 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 238000005452 bending Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000002500 effect on skin Effects 0.000 description 3
- 238000010923 batch production Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Classifications
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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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- 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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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The invention discloses a stator winding, a stator, a motor and a vehicle, wherein the stator winding comprises a multi-phase winding, each phase winding comprises a plurality of groups of winding branches, each group of winding branches comprises two branches connected in parallel, each branch comprises a plurality of coils which are sequentially arranged on a circumferential iron core slot of a stator iron core and are connected in series, the coils of the two branches in each group of winding branches are arranged in adjacent iron core slots, one branch comprises a coil with a pitch of y +1, the other branch comprises a coil with a pitch of y-1, and the pitches of the other coils of the two branches in each group of winding branches are y; and the coil with the pitch of y +1 and the coil with the pitch of y-1 are both positioned at the bottommost layer of the bottom of the iron core groove and positioned in the adjacent iron core groove. The invention has the advantages of ensuring the symmetry of each branch, simple and compact structure, simple assembly, small motor volume and the like.
Description
Technical Field
The invention mainly relates to the technical field of motors, in particular to a stator winding, a stator with the stator winding, a motor and a vehicle.
Background
With the rapid development of new energy automobile technology, the performance requirement of a driving motor as one of the key execution components of an electric automobile is higher and higher. At present, high speed, light weight and high efficiency become the development trend of driving motors, and have higher requirements on the power density, the high efficiency area and the heat dissipation capacity of the motors.
The stator winding can be divided into round wires and flat wires, and compared with the round wire winding, the flat wire winding can effectively improve the slot filling rate of the motor, reduce the copper consumption of the motor so as to improve the efficiency of the motor, and simultaneously can also reduce the height of the end part of the motor winding so as to reduce the volume of the motor and improve the power/torque density. However, the flat wire winding has an inherent skin effect phenomenon, and particularly, the skin effect is obvious in a high-speed motor. To reduce the skin effect, the number of conductors in the stator slot is generally increased, such as 4 layers, 6 layers, 8 layers, etc. Because the conductors of each parallel branch are distributed at different positions of the inner diameter of the stator slot, if each branch is asymmetric, the back electromotive force, the resistance and the inductance are greatly different, so that a circulating current is formed, the additional loss is increased, the efficiency is reduced, the local over-temperature of a motor winding is caused, and the service life of the motor is shortened.
One of the difficulties in designing the motor in the winding arrangement and connection mode of the hairpin motor is that the arrangement mode of the hairpin coil in the prior art generally has the following problems:
1) the existing hairpin coils are more in types and complex in arrangement mode; a large number of bus bars and busbars are required to connect the branches and the center points of the windings of the respective phases, which results in a winding end height, resulting in an increase in the axial length of the motor;
2) the number of special-shaped coils is large, the coil manufacturing difficulty is increased due to the presence of the special-shaped coils, and the coil is not favorable for batch production;
3) the problem of asymmetric winding branches exists, so that differences of counter electromotive force, resistance, inductance and the like exist, the performance of the motor is reduced, winding circulation is caused, additional loss of the motor is increased, and local overheating of the motor is caused.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides a stator winding with symmetrical branches, a stator, a motor and a vehicle.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a stator winding comprises multiphase phase windings, each phase winding comprises a plurality of groups of winding branches connected in parallel, each group of winding branches comprises two branches connected in parallel, each branch comprises a plurality of coils which are sequentially arranged on a circumferential iron core slot of a stator iron core and are connected in series, the coils of two branches in each group of winding branches are arranged in adjacent iron core slots, one branch comprises a coil with a pitch of y +1, the other branch comprises a coil with a pitch of y-1, and the pitches of the other coils of the two branches in each group of winding branches are y; and the coil with the pitch of y +1 and the coil with the pitch of y-1 are both positioned at the bottommost layer of the bottom of the iron core groove and positioned in the adjacent iron core groove.
As a further improvement of the above technical solution:
the coil with the pitch of y-1 positioned at the bottommost layer of the groove bottom is positioned on the inner side of the coil with the pitch of y +1, and the two coils are concentrically arranged.
The coil with the pitch of y +1 and the coil with the pitch of y-1 both comprise a first coil main body and a first bending part, the first coil main body comprises two first supporting rods which are arranged in parallel and a first head part connected with one ends of the two first supporting rods, the first bending part is located at the other ends of the two first supporting rods to form a welding end, and the first bending part is bent along one side of the width direction of the first coil main body.
The first head part is V-shaped or arc-shaped.
The pitch all includes second coil main part and second kink for y's coil, second coil main part includes two mutual parallel arrangement's second branch and connects the second head of two second branch one ends, the second kink is located the other end of two second branches in order to form the welding end, and the second kink on two second branches all follows the width direction of second coil main part, and buckles in the direction of keeping away from second coil main part.
The second heads are all V-shaped or arc-shaped.
The neutral points of the coils are connected through copper busbars, and the height of the neutral points does not exceed the height of the welding ends of the coils.
The phase winding comprises a group of winding branches, one of the winding branches comprises a coil A1-a2, A3-a4, A5-a6 and A7-A8, and the other winding branch comprises a coil B1-B2, a coil B3-B4, a coil B5-B6 and a coil B7-B8; the coils A1-a2 and B1-B2 are located on the 1 st layer of the iron core slot along the direction from the slot bottom to the slot opening, the pitch of A1-a2 is y-1, and the pitch of B1-B2 is y + 1;
the pitches A3-a4 and B3-B4 are y, the upper layer edge is positioned at the 2 nd layer of the iron core groove, and the lower layer edge is positioned at the 3 rd layer of the iron core groove;
the pitches A5-a6 and B5-B6 are y, the upper layer edge is positioned at the 4 th layer of the iron core groove, and the lower layer edge is positioned at the 5 th layer of the iron core groove;
the joints A7-A8 and B7-B8 are y, and the upper layer edge and the lower layer edge are positioned at the 6 th layer of the iron core groove;
a1-a2 was connected to A3-a4 at the weld end, A3-a4 coil was connected to A5-a6 at the weld end, A5-a6 was connected to A7-A8 at the weld end, and so on;
the coil connection sequence is from the 1 st layer to the 6 th layer, and then from the 6 th layer to the 1 st layer, and the cycle is repeated.
The invention also discloses a stator which comprises a stator core and the stator winding, wherein the stator core is provided with a plurality of core slots in the circumferential direction, and the phase windings in the stator winding are arranged in the core slots.
The invention further discloses an electric machine comprising a stator as described above.
The invention also discloses a vehicle comprising the motor.
Compared with the prior art, the invention has the advantages that:
according to the stator winding, the stator, the motor and the vehicle, the two branches in each group of winding branches are respectively provided with the coil with the pitch of y +1 and the coil with the pitch of y-1, the coils with different pitches are transposed, the phase difference between different branches is eliminated, each branch is ensured to be completely symmetrical, and therefore the performance of the motor is improved.
According to the stator winding, the stator, the motor and the vehicle, the shape of each coil is uniform U-shaped or V-shaped, and the opposite coil and the cross-connection coil are eliminated, so that the assembly and the batch production are facilitated.
According to the stator winding, the stator, the motor and the vehicle, the neutral points of the coils are welded through the single copper busbar, the height of the neutral points is not more than that of the welding ends of the coils, the structure is simple, and the height of the end part of the winding is reduced, so that the size of the motor is reduced.
Drawings
Fig. 1 is a structural view of a stator winding in an embodiment of the present invention.
Fig. 2 is a layout diagram of an embodiment of the U-phase winding of the present invention.
Fig. 3 is a schematic structural diagram of a first coil according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a second coil according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a stator according to an embodiment of the present invention.
The reference numbers in the figures denote: 11. a first coil body; 111. a first support bar; 112. a first head portion; 12. a first bent portion; 21. a second coil body; 211. a second support bar; 212. a second head; 22. a second bent portion; 3. copper busbar.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments of the description.
As shown in fig. 1 to 5, the stator winding of this embodiment includes a multi-phase winding, each phase winding includes multiple groups of winding branches, each group of winding branches includes two parallel branches, each branch in each group of winding branches includes multiple coils sequentially arranged in a circumferential core slot and connected in series with each other, the coils between two branches in each group of winding branches are arranged in adjacent core slots, one of the branches includes a coil with a pitch of y +1, the other branch includes a coil with a pitch of y-1, and the pitches of the other coils of the two branches in each group of winding branches are y; the coils with the pitch of y +1 and the coils with the pitch of y-1 in the same winding branch are both positioned at the bottommost layer of the bottoms of the iron core slots and positioned in the adjacent iron core slots.
According to the stator winding, two branches in a group of winding branches respectively comprise a coil with the pitch of y +1 and a coil with the pitch of y-1, the coils with different pitches are transposed, the phase difference between different branches is eliminated, each branch is completely symmetrical, the problems of motor performance reduction, winding circulation, motor additional loss increase and motor local overheating caused by asymmetrical branches are avoided, and therefore the motor performance is improved.
As shown in fig. 3 and 4, in the present embodiment, a coil with a pitch of y +1 and a coil with a pitch of y-1 are referred to as first coils 1, each of the first coils 1 includes a first coil main body 11 and a first bent portion 12, the first coil main body 11 includes two first struts 111 arranged in parallel with each other and a first head 112 connecting one ends of the two first struts 111, the first bent portion 12 is located at the other ends of the two first struts 111 to form a welded end, and the first bent portion 12 is bent along one side of the first coil main body 11 in the width direction. As shown in FIG. 3, the coils with the pitch of y +1 and the coils with the pitch of y-1 which are positioned at the bottommost layer of the slot bottom are both U-shaped, the coils with the pitch of y-1 are positioned at the inner side of the coils with the pitch of y +1, and the two coils are concentrically arranged.
As shown in fig. 4, in the present embodiment, the coil with the pitch y is called a second coil 2, the second coil 2 includes a second coil main body 21 and a second bending portion 22, the second coil main body 21 includes two second support rods 211 arranged in parallel with each other and a second head portion 212 connected to one end of the two second support rods 211, the second bending portion 22 is located at the other end of the two second support rods 221 to form a welding end, and the second bending portions 22 on the two second support rods 221 are bent along the width direction of the second coil main body 21 and in a direction away from the second coil main body 21.
In the present embodiment, the first head portion 12 and the second head portion 22 are both V-shaped or arc-shaped. The coil with the V-shaped head is called a V-shaped coil, and the coil with the arc-shaped head is called a U-shaped coil. In this embodiment, each coil may be a U-shaped coil or a V-shaped coil, and since each coil has the same shape, the opposite coil and the crossover coil are eliminated, thereby facilitating assembly and mass production. Of course, in other embodiments, a combination of U-shaped coils and V-shaped coils may be used.
In this embodiment, the neutral point (e.g., a48 and b48 in fig. 2) of each coil is welded by the single copper busbar 3, and the height of the neutral point does not exceed the height of the welding end of the coil, so that the structure is simple, and the height of the winding end is reduced, thereby reducing the volume of the motor.
Specifically, taking a motor with a 48-slot and 8-pole branch number of 2 as an example, the number of coil layers sequentially increases from the slot bottom to the slot opening, i.e., from the first layer to the sixth layer (in other embodiments, two, four, eight, etc. layers may also be provided), and the connection diagram of the U-phase winding is shown in fig. 2:
wherein one branch of the phase windings comprises coils A1-a2, A3-a4, A5-a6 and A7-A8, and the other branch comprises coils B1-B2, B3-B4, B5-B6 and B7-B8;
one branch coil is connected in the form of A-a, and the other branch coil is connected in the form of B-B;
the first layer is composed of U-shaped coils with different spans, the second layer and the third layer are U-shaped coils with the same span, the fourth layer and the fifth layer are U-shaped coils with the same span, and the sixth layer is also U-shaped coils with the same span;
for example, the span of A1-a2 is 5, the span of B1-B2 is 7, and the concentric U-shaped coils are formed together;
a3-a4 and B3-B4 are U-shaped coils with the span of 6 respectively;
a5-a6 and B5-B6 are U-shaped coils with the span of 6 respectively;
A7-A8 and B7-B8 are U-shaped coils with the span of 6 respectively;
the A1-a2 of one branch and the B1-B2 of the other branch are both positioned at the 1 st layer, the pitch of A1-a2 is 5, the pitch of B1-B2 is 7, and the shape of the coil is shown in FIG. 3;
the pitches A3-a4 and B3-B4 are all 6, the upper layer edge is positioned on the 2 nd layer, the lower layer edge is positioned on the 3 rd layer, and the shape is shown in FIG. 4;
the pitches of the A5-a6 coils and the B5-B6 coils are all 6, the upper layer side is positioned on the 4 th layer, the lower layer side is positioned on the 5 th layer, and the shape of the coils is shown in FIG. 4;
the upper layer side and the lower layer side of the A7-A8 and B7-B8 coils are positioned at the 6 th layer, as shown in FIG. 4;
the A1-a2 coil was connected to the A3-a4 coil at the weld end, the A3-a4 coil was connected to the A5-a6 coil at the weld end, the A5-a6 coil was connected to the A7-A8 coil at the weld end, and so on.
The coil connection sequence is from the 1 st layer to the 6 th layer, and then from the 6 th layer to the 1 st layer, and the cycle is repeated.
The stator winding provided by the invention has the advantages that by adopting a mode of combining the U-shaped coil and the V-shaped coil, linear and non-deformed wires are reduced, the complexity of the manufacturing process is reduced, the production is convenient, a series of problems caused by asymmetry of each branch can be eliminated, meanwhile, the bus structure is simplified, and the structure is compact.
The invention also discloses a stator which comprises the stator core and the stator winding, wherein the stator core is provided with a plurality of core slots in the circumferential direction, and the phase windings in the stator winding are arranged in the core slots. The stator of the invention comprises a stator winding as described above, with the same advantages as described above for the stator winding.
The invention further discloses an electric machine comprising a stator as described above. The motor of the invention also comprises the stator winding, has the advantages of the stator winding, and has simple integral structure, small volume and high working stability.
The invention further discloses a vehicle comprising an electric machine as described above. The vehicle of the invention comprises a stator winding as described above, with the same advantages as described above for the stator winding.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (11)
1. A stator winding comprises a multiphase phase winding, and is characterized in that each phase winding comprises a plurality of groups of winding branches connected in parallel, each group of winding branches comprises two branches connected in parallel, each branch comprises a plurality of coils which are sequentially arranged on a circumferential iron core groove of a stator iron core and are connected in series, the coils of two branches in each group of winding branches are arranged in adjacent iron core grooves, one branch comprises a coil with a pitch of y +1, the other branch comprises a coil with a pitch of y-1, and the pitches of the other coils of the two branches in each group of winding branches are y; and the coil with the pitch of y +1 and the coil with the pitch of y-1 are both positioned at the bottommost layer of the bottom of the iron core groove and positioned in the adjacent iron core groove.
2. A stator winding according to claim 1, wherein the coils with the pitch y-1 located at the bottommost layer of the slot bottom are located at the inner side of the coils with the pitch y +1, and the two coils are concentrically arranged.
3. A stator winding according to claim 1, wherein the coil with the pitch of y +1 and the coil with the pitch of y-1 each comprise a first coil main body (11) and a first bent portion (12), the first coil main body (11) comprises two first support rods (111) arranged in parallel with each other and a first head portion (112) connecting one ends of the two first support rods (111), the first bent portion (12) is located at the other ends of the two first support rods (111) to form a welded end, and the first bent portion (12) is bent along one side of the first coil main body (11) in the width direction.
4. A stator winding according to claim 3, characterized in that the first head (112) is V-shaped or circular arc-shaped.
5. A stator winding according to any one of claims 1 to 4, wherein the coils with the pitch y each comprise a second coil body (21) and a second bent portion (22), the second coil body (21) comprises two second struts (211) arranged in parallel with each other and a second head portion (212) connecting one ends of the two second struts (211), the second bent portion (22) is located at the other ends of the two second struts (211) to form a welded end, and the second bent portions (22) on the two second struts (211) are bent in the width direction of the second coil body (21) and in the direction away from the second coil body (21).
6. Stator winding according to claim 5, characterized in that the second heads (212) are each V-shaped or arc-shaped.
7. A stator winding according to claim 1, 2 or 3, characterized in that the neutral points of the coils are connected by copper bars (3) whose height does not exceed the height of the welded ends of the coils.
8. A stator winding according to claim 1, 2 or 3, characterized in that the phase winding comprises a set of winding branches, one of which comprises coils a1-a2, A3-a4, a5-a6, a7-A8, the other comprises coils B1-B2, B3-B4, B5-B6, B7-B8; the coils A1-a2 and B1-B2 are located on the 1 st layer of the iron core slot along the direction from the slot bottom to the slot opening, the pitch of A1-a2 is y-1, and the pitch of B1-B2 is y + 1;
the pitches A3-a4 and B3-B4 are y, the upper layer edge is positioned at the 2 nd layer of the iron core groove, and the lower layer edge is positioned at the 3 rd layer of the iron core groove;
the pitches A5-a6 and B5-B6 are y, the upper layer edge is positioned at the 4 th layer of the iron core groove, and the lower layer edge is positioned at the 5 th layer of the iron core groove;
the joints A7-A8 and B7-B8 are y, and the upper layer edge and the lower layer edge are positioned at the 6 th layer of the iron core groove;
a1-a2 was connected to A3-a4 at the weld end, A3-a4 coil was connected to A5-a6 at the weld end, A5-a6 was connected to A7-A8 at the weld end, and so on;
the coil connection sequence is from the 1 st layer to the 6 th layer, and then from the 6 th layer to the 1 st layer, and the cycle is repeated.
9. A stator comprising a stator core provided with a plurality of core slots in a circumferential direction and a stator winding according to any one of claims 1 to 8, wherein phase windings of the stator winding are arranged in the core slots.
10. An electrical machine comprising a stator according to claim 9.
11. A vehicle characterized by comprising an electric machine according to claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010311234.3A CN111371222B (en) | 2020-04-20 | 2020-04-20 | Stator winding, stator with same, motor and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010311234.3A CN111371222B (en) | 2020-04-20 | 2020-04-20 | Stator winding, stator with same, motor and vehicle |
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| Publication Number | Publication Date |
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| CN111371222A true CN111371222A (en) | 2020-07-03 |
| CN111371222B CN111371222B (en) | 2021-06-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112448513A (en) * | 2020-11-16 | 2021-03-05 | 重庆宗申电动力科技有限公司 | Motor winding structure, stator module and motor |
| CN114142644A (en) * | 2021-11-19 | 2022-03-04 | 株洲中车时代电气股份有限公司 | Motor stator winding structure, motor and vehicle |
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| CN109510356A (en) * | 2018-11-22 | 2019-03-22 | 中国第汽车股份有限公司 | A kind of three-phase flat wire motor stator winding |
| CN110266134A (en) * | 2019-07-30 | 2019-09-20 | 重庆宗申电动力科技有限公司 | Two branch phase windings of one kind, stator and motor |
| CN110417150A (en) * | 2019-07-30 | 2019-11-05 | 重庆宗申电动力科技有限公司 | A kind of four branch phase winding of aspergillus ficuum, stator and motor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112448513A (en) * | 2020-11-16 | 2021-03-05 | 重庆宗申电动力科技有限公司 | Motor winding structure, stator module and motor |
| CN114142644A (en) * | 2021-11-19 | 2022-03-04 | 株洲中车时代电气股份有限公司 | Motor stator winding structure, motor and vehicle |
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