CN110277856B - Stator of a rotating electrical machine - Google Patents
Stator of a rotating electrical machine Download PDFInfo
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- CN110277856B CN110277856B CN201910169807.0A CN201910169807A CN110277856B CN 110277856 B CN110277856 B CN 110277856B CN 201910169807 A CN201910169807 A CN 201910169807A CN 110277856 B CN110277856 B CN 110277856B
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- 239000010410 layer Substances 0.000 claims description 113
- 230000002093 peripheral effect Effects 0.000 claims description 32
- 239000012790 adhesive layer Substances 0.000 claims description 11
- 239000011810 insulating material Substances 0.000 claims description 7
- 239000011241 protective layer Substances 0.000 claims description 7
- 230000004907 flux Effects 0.000 description 21
- 239000004020 conductor Substances 0.000 description 7
- 230000004048 modification Effects 0.000 description 7
- 238000012986 modification Methods 0.000 description 7
- 238000005187 foaming Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000001965 increasing effect Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 238000004904 shortening Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000002966 varnish Substances 0.000 description 2
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 239000004962 Polyamide-imide Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920003235 aromatic polyamide Polymers 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- -1 formal Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920003055 poly(ester-imide) Polymers 0.000 description 1
- 229920002312 polyamide-imide Polymers 0.000 description 1
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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
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/34—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation
- H02K3/345—Windings characterised by the shape, form or construction of the insulation between conductors or between conductor and core, e.g. slot insulation between conductor and core, e.g. slot insulation
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/42—Means for preventing or reducing eddy-current losses in the winding heads, e.g. by shielding
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulation, Fastening Of Motor, Generator Windings (AREA)
Abstract
本发明提供一种能够减少涡流损耗且生产率优异的旋转电机的定子。旋转电机的定子(10)具备：定子铁芯(12)，其形成有多个插槽(16)；以及线圈(20)，其包括插入于多个插槽(16)各自中的分段线圈(21～28)，在各插槽(16)中，至少一张的绝缘纸(31)在从轴向观察时配置成环绕两个以上的分段线圈(21、22)，在至少一张的绝缘纸(31)上设置有磁性体层(41)。
The present invention provides a stator for a rotating electric machine that can reduce eddy current loss and is excellent in productivity. A stator (10) for a rotating electrical machine includes: a stator core (12) formed with a plurality of slots (16); and a coil (20) including segmented coils inserted into each of the plurality of slots (16) (21-28), in each slot (16), at least one piece of insulating paper (31) is arranged to surround two or more segmented coils (21, 22) when viewed from the axial direction, and in at least one piece A magnetic layer (41) is arranged on the insulating paper (31).
Description
Technical Field
The present invention relates to a stator of a rotating electric machine, and more particularly, to a stator of a rotating electric machine including a coil including a plurality of segment coils in slots.
Background
Conventionally, a rotating electrical machine in which eddy current loss due to leakage magnetic flux is reduced is known. For example, patent document 1 discloses a stator of a rotating electric machine in which coils having magnetic layers and coils having no magnetic layers are alternately arranged in a radial direction of slots, thereby increasing a space factor and reducing eddy current loss.
Prior art documents
Patent document 1: japanese patent laid-open No. 2014-057460
However, in the stator of the rotating electric machine of patent document 1, at least two types of coils, that is, a coil having a magnetic layer and a coil having no magnetic layer, need to be used, and in addition, in manufacturing the coil body, the coil having the magnetic layer and the coil having no magnetic layer must be alternately arranged, so that there is a problem that the coils may be assembled into the slots in an incorrect order, resulting in low productivity.
Disclosure of Invention
The invention provides a stator of a rotating electric machine, which can reduce eddy current loss and has excellent productivity.
The present invention provides a stator of a rotating electric machine, comprising:
a stator core formed with a plurality of slots; and
a coil comprising a plurality of segmented coils inserted into each of the plurality of slots, wherein,
in each of the slots, at least one piece of insulating paper is arranged to surround two or more of the segment coils when viewed from the axial direction,
a magnetic layer is provided on at least one of the insulating papers.
Effects of the invention
According to the present invention, at least one piece of insulating paper is arranged so as to surround two or more segment coils when viewed from the axial direction in each slot, and the magnetic body layer is provided on the insulating paper, so that leakage magnetic flux flowing from the rotor side of the rotating electric machine to the stator core side in the circumferential direction flows to the magnetic body layer more than the segment coils. Therefore, the magnetic flux flowing through the segment coil can be reduced, and thus the generation of eddy current in the segment coil can be reduced, and the eddy current loss can be reduced. Further, since the magnetic layer is provided on the insulating paper, it is not necessary to use a plurality of segment coils divided by the presence or absence of the covering of the magnetic layer, and productivity when the segment coils are inserted into the slots is improved. Further, since the magnetic layer is provided on the insulating paper, the magnetic layer has a high degree of freedom in design, and the magnetic layer can be efficiently disposed.
Drawings
Fig. 1 is a sectional view of a slot of a stator of a rotating electric machine according to a first embodiment of the present invention.
Fig. 2 is a cross-sectional view of a first modification of the slot of the stator of the rotating electric machine according to the first embodiment of the present invention.
Fig. 3 is a sectional view of a second modification of the slot of the stator of the rotating electric machine according to the first embodiment of the present invention.
Fig. 4 is a sectional view a-a of fig. 1.
Fig. 5 is a sectional view of an insulating paper in the first embodiment of the present invention.
Fig. 6 is a cross-sectional view of a first modification of the insulating paper according to the first embodiment of the present invention.
Fig. 7 is a cross-sectional view of a second modification of the insulating paper according to the first embodiment of the present invention.
Fig. 8 is a cross-sectional view of a third modification of the insulating paper according to the first embodiment of the present invention.
Fig. 9 is a sectional view of a slot of a stator of a rotating electric machine according to a second embodiment of the present invention.
Fig. 10 is a cross-sectional view of a first modification of the slot of the stator of the rotating electric machine according to the second embodiment of the present invention.
Fig. 11 is a sectional view of a slot of a stator of a rotating electric machine according to a third embodiment of the present invention.
Fig. 12 is a cross-sectional view of a first modification of the slot of the stator of the rotating electric machine according to the third embodiment of the present invention.
Description of reference numerals:
10 a stator;
12 a stator core;
16 slots;
16a right side wall;
16b opening part;
16c left side wall;
16d a bottom wall;
20 coils;
21. 22, 23, 24, 25, 26, 27, 28 segmented coils;
31. 32, 33, 34 insulating paper;
41. 42, 43, 44 magnetic layers;
61 a protective layer;
71 an insertional enhancement layer;
81 foaming the adhesive layer.
Detailed Description
Hereinafter, each embodiment of the battery module according to the present invention will be described with reference to the drawings.
[ first embodiment ]
First, a stator of a rotating electric machine according to a first embodiment of the present invention will be described with reference to fig. 1 to 8.
As shown in fig. 1, a stator 10 of a rotating electric machine according to the present embodiment includes a stator core 12 formed by laminating a plurality of annular electromagnetic steel plates made of a magnetic material, and a coil 20. The stator core 12 includes a plurality of teeth 14 protruding radially inward at predetermined intervals along the circumferential direction, and slots 16 that are spaces between adjacent teeth 14.
The coil 20 has segment coils 21-28 laminated from the inside to the outside in the radial direction in the slot 16. The segment coils 21 to 28 are insulated conductors. Each of the segment coils 21 to 28 has, for example, a substantially rectangular cross-section and a substantially crank-like shape, and has, at both ends, protruding portions protruding from both ends in the axial direction of the stator core 12. The protrusions of one side and the other side are electrically connected with the protrusions of the segment coils of the other slot 16, respectively, and the process is repeated, thereby forming a coil loop.
In the slot 16, 4 insulating sheets 31 to 34 made of an insulating member are arranged from the inside to the outside in the radial direction. When viewed from the axial direction of the stator core 12, 1 of the 4 insulation sheets 31 is arranged in a substantially B-shape by surrounding the outer periphery of the segment coil 21 from between the segment coil 21 and the segment coil 22 toward the right side wall 16a, the opening 16B, and the left side wall 16c of the slot 16, further surrounding the outer periphery of the segment coil 22 toward the left side wall 16c, the bottom wall 16d, and the right side wall 16a of the slot 16, and returning to between the segment coil 21 and the segment coil 22. The other 3 sheets of insulating paper 32, 33, 34 are similarly wound around the segment coil 23 and the segment coil 24, the segment coil 25 and the segment coil 26, the segment coil 27 and the segment coil 28, respectively, and arranged in a substantially B-shape.
On the insulating paper 31, magnetic layers 41 are provided on the left and right (circumferential) side surfaces of the segment coils 21 and 22, the radially inner surfaces of the segment coils 21, and the radially outer surfaces of the segment coils 22 so as to surround the segment coils 21 and 22 when viewed in the axial direction of the stator core 12, on the surface opposite to the surface facing the segment coils 21 and 22. Similarly, magnetic layers 42, 43, and 44 are provided on the other 3 sheets of insulating paper 32, 33, and 34 so as to surround the segment coil 23 and the segment coil 24, the segment coil 25 and the segment coil 26, and the segment coil 27 and the segment coil 28, respectively.
The magnetic layers 41-44 are layers of magnetic material having a higher permeability than the conductors of the segment coils 21-28. Examples of the material of the magnetic layers 41 to 44 include iron-nickel alloys and soft magnetic materials.
In a typical rotating electrical machine, when a rotor (not shown) rotates, leakage magnetic flux in the circumferential direction flows from the rotor side to the stator core side. When the leakage flux flows through the conductor portion of the coil, an eddy current is generated in the conductor portion of the coil, and an eddy current loss is generated. In the stator 10 of the rotating electric machine according to the present embodiment, the magnetic layers 41 to 44 having a higher magnetic permeability than the conductors of the segment coils 21 to 28 are disposed in the slot 16, and therefore, the magnetic flux flows more easily to the magnetic layers 41 to 44 than to the segment coils 21 to 28. Therefore, the leakage magnetic fluxes 51 to 55 flowing from the rotor side to the stator core 12 side in the circumferential direction hardly flow to the segment coils 21 to 28, but flow to the magnetic layers 41 to 44. This reduces eddy currents generated in the conductors of the segment coils 21 to 28, thereby reducing eddy current loss.
In addition, since the segment coils 21 to 28 of the present embodiment can use segment coils having the same shape and structure, it is not necessary to use a plurality of types of segment coils. Therefore, the manufacturing cost can be reduced. Further, there is no concern that the segment coils are assembled into the slots in the wrong order, which is generated when a plurality of kinds of segment coils divided based on the presence or absence of the magnetic body layer are used, and thus, the productivity is excellent.
Further, the insulating paper 31 is arranged so as to surround the segment coil 21 and the segment coil 22 and overlap between the segment coil 21 and the segment coil 22, so that the insulating distance between the segment coil 21 and the segment coil 22 can be increased. In addition, since the both end portions of the insulating paper 31 are sandwiched between the segment coils 21 and 22 when viewed from the axial direction of the stator core 12, the insulating paper 31 and the segment coils 21 and 22 can be arranged in the slots 16 without being displaced, and excellent productivity is achieved.
The more radially inward the stator core 12 closer to the rotor, the more circumferential leakage magnetic flux flows from the rotor side to the stator core 12 side, and the more radially outward the stator core 12 farther from the rotor, the less circumferential leakage magnetic flux flows from the rotor side to the stator core 12 side. Therefore, when viewed from the axial direction of the stator core 12, the influence of the leakage magnetic flux of the segment coil 21 disposed at the most radially inner side of the slot 16 is the greatest, and the influence of the leakage magnetic flux decreases in the order of the segment coils 22, 23, 24, 25, 26, 27, and 28 as the segment coils are disposed radially outward.
Therefore, as shown in fig. 2, when viewed in the axial direction of the stator core 12, the magnetic layer 41 may be provided on the insulating paper 31, and the magnetic layer may not be provided on the insulating paper 32, 33, 34, and the insulating paper 31 may surround the segment coils 21 and 22 disposed at the radially innermost positions of the slots 16.
According to this configuration, since the leakage flux 51 having the largest magnetic flux and the leakage flux 52 having the larger magnetic flux after the leakage flux 51 hardly flow through the segment coils 21 and 22 and flow through the magnetic layer 41, eddy currents generated in the conductor portions of the segment coils 21 and 22 can be reduced. This can reduce the eddy current loss in the segment coils 21 and 22 that are most affected by the leakage magnetic flux, and can reduce the eddy current loss more effectively.
Further, since the magnetic layers are not provided on the insulating papers 32, 33, and 34, the space between the segment coils can be reduced by the thickness of the magnetic layers, and the space factor can be improved.
In the slot 16, the circumferential width of the portion surrounded by the insulating paper 32, 33, 34 on which the magnetic layer is not provided may be made narrower than the circumferential width of the portion surrounded by the insulating paper 31 on which the magnetic layer is provided. This can increase the circumferential width of the teeth 14 at the portion surrounded by the insulating paper 32, 33, 34 where no magnetic layer is provided, and thus can increase the output torque of the rotating electrical machine.
Note that 1 sheet of insulating paper 31 may be arranged so as to surround 2 or more segment coils 21 and 22 as a set. For example, as shown in fig. 3, the insulating paper 31 may be arranged in a substantially B-shape by surrounding the outer peripheries of the segment coil 21 and the segment coil 22 from between the segment coil 22 and the segment coil 23 toward the right side wall 16a, the opening 16B, and the left side wall 16c of the slot 16, surrounding the outer peripheries of the segment coil 23 and the segment coil 24 toward the left side wall 16c, the bottom wall 16d, and the right side wall 16a of the slot 16, and returning to between the segment coil 22 and the segment coil 23, when viewed in the axial direction of the stator core 12. The insulating paper 32 may be similarly arranged in a substantially B-shape so as to surround the segment coils 25 and 26 and the segment coils 27 and 28.
On the insulating paper 31, magnetic layers 41 are provided on both left and right side surfaces of the segment coils 21 to 24, on inner side surfaces in a radial direction of the segment coil 21, and on outer side surfaces in the radial direction of the segment coil 24 so as to surround the segment coils 21 to 24 when viewed in the axial direction of the stator core 12, on a surface opposite to a surface facing the segment coils 21 to 24. Similarly, the magnetic layer 42 may be provided on the insulating paper 32 so as to surround the segment coils 25 to 28.
Here, the segment coil 21 and the segment coil 22 are, for example, U-phase and in-phase. The segment coil 23 and the segment coil 24 are, for example, V-phase and in-phase, and are in a phase different from that of the segment coils 21 and 22.
Accordingly, the segment coils 21 and 22 and the segment coils 23 and 24 in the same phase can shorten the distance between the segment coils, and the segment coils 22 and 23 in different phases can secure the insulation distance between the segment coils 22 and 23 in the thickness of two sheets of insulation paper. Therefore, the space factor is improved by shortening the distance between the segment coils of the same phase while reliably insulating the segment coils of different phases from each other.
As shown in fig. 4, the magnetic layer 41 is disposed inside the axial end of the stator core 12, that is, the axial end of the teeth 14. Accordingly, conduction between the segment coil 21 and the other segment coils 22 to 28 outside the stator core 12 and conduction between the segment coil 21 and the stator core 12 do not occur via the magnetic body layer 41, and the segment coil 21 and the other segment coils 22 to 28 and the segment coil 21 and the stator core 12 can be reliably insulated.
The magnetic layer 41 may be divided into a plurality of (9 in fig. 4) in the axial direction of the stator core 12. This can reduce axial conduction of stator core 12 by magnetic layer 41, and can reduce loss due to axial conduction of stator core 12.
As shown in fig. 5, magnetic layer 41 is integrally formed on insulating paper 31 with adhesive layer 91 interposed therebetween. Thus, since the magnetic layer 41 can be simultaneously disposed by disposing the insulating paper 31 in the slot 16, the magnetic layer 41 can be easily disposed in the slot 16, and excellent productivity can be achieved. The magnetic layers 42, 43, and 44 are also integrally formed on the insulating papers 32, 33, and 34 in the same manner.
As shown in fig. 6, a protective layer 61 made of an insulating material may be integrally provided on the outer surface of the magnetic layer 41 via an adhesive layer 91. As a material of the protective layer 61, for example, polyamideimide, polyesterimide, polyimide, polyester, formal, glass fiber impregnated with resin, or the like is used. This can prevent damage to magnetic layer 41 and prevent conduction between stator core 12 and magnetic layer 41. The insulating sheets 32, 33, and 34 may be set in the same manner.
As shown in fig. 7, an insertion enhancing layer 71 may be integrally provided on the outer surfaces of the insulating paper 31 and the magnetic layer 41 via an adhesive layer 91. The insertion-property improving layer 71 is made of, for example, aramid paper having an insulating property. Accordingly, when the insulating paper 31 and the magnetic layer 41 are disposed in the slot 16, the insulating paper 31 and the magnetic layer 41 do not contact the slot 16, and the insertion-property-improving layer 71 having a low friction coefficient contacts the slot 16, so that the insulating paper 31 and the magnetic layer 41 can be smoothly disposed, and productivity is improved. The insulating sheets 32, 33, and 34 may be set in the same manner.
As shown in fig. 8, a foam adhesive layer 81 may be laminated on the outer surfaces of the insulating paper 31 and the magnetic layer 41. Since the insulating paper 31 and the magnetic layer 41 are fixed in the slot 16 together with the segment coils by foaming the foaming adhesive layer 81 after the insulating paper 31 and the magnetic layer 41 are disposed in the slot 16, a step of fixing the coil 20, the insulating paper 31, and the magnetic layer 41 in the slot 16 with varnish or the like is not required, and productivity is improved. The insulating sheets 32, 33, and 34 may be set in the same manner.
In the present embodiment, the insulating sheets 31 to 34 are arranged in a substantially B-shape when viewed from the axial direction of the stator core 12, but may be arranged in an inverted B-shape with the left and right sides reversed.
[ second embodiment ]
Next, a stator 10 of a rotating electric machine according to a second embodiment of the present invention will be described with reference to fig. 9 to 10. In the following description, the same components as those of the stator 10 of the rotating electric machine according to the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted or simplified.
As shown in fig. 9, the slot 16 of the stator 10 of the rotating electric machine according to the present embodiment includes 4 insulating sheets 31 to 34 made of insulating members from the inside to the outside in the radial direction. When viewed in the axial direction of the stator core 12, 1 of the 4 sheets of insulating paper 31 is arranged in a substantially S-shape so as to surround the outer peripheral portion of the segment coil 21 toward the left side wall 16c, the opening 16b, and the right side wall 16a of the slot 16, pass between the segment coil 21 and the segment coil 22, and surround the outer peripheral portion of the segment coil 22 toward the left side wall 16c, the bottom wall 16d, and the right side wall 16a of the slot 16. The other 3 sheets of insulating paper 32, 33, 34 are similarly arranged in a substantially S-shape by being wound around the segment coil 23 and the segment coil 24, the segment coil 25 and the segment coil 26, and the segment coil 27 and the segment coil 28, respectively.
On the insulating paper 31, magnetic layers 41 are provided on the left and right (circumferential) side surfaces of the segment coils 21 and 22, the radially inner surfaces of the segment coils 21, and the radially outer surfaces of the segment coils 22 so as to surround the segment coils 21 and 22 when viewed in the axial direction of the stator core 12, on the surface opposite to the surface facing the segment coils 21 and 22. Similarly, magnetic layers 42, 43, and 44 are provided on the other 3 sheets of insulating paper 32, 33, and 34 so as to surround the segment coil 23 and the segment coil 24, the segment coil 25 and the segment coil 26, and the segment coil 27 and the segment coil 28, respectively.
This eliminates the overlapping portion of the insulating paper 31, and therefore, the amount of the insulating paper 31 to be used can be reduced, and the manufacturing cost can be reduced.
Note that 1 piece of insulating paper 31 may be arranged so as to surround 2 or more segment coils 21 and 22 as a set. For example, as shown in fig. 10, the insulating paper 31 is arranged in a substantially S-shape such that, when viewed in the axial direction of the stator core 12, the outer peripheries of the segment coil 21 and the segment coil 22 are surrounded by the left side wall 16c, the opening 16b side, and the right side wall 16a of the slot 16, the insulating paper passes between the segment coil 22 and the segment coil 23, and the outer peripheries of the segment coil 23 and the segment coil 24 are surrounded by the left side wall 16c, the bottom wall 16d side, and the right side wall 16a of the slot 16. Similarly, the insulating paper 32 may be arranged in a substantially S-shape by surrounding the segment coils 25 and 26 and the segment coils 27 and 28, respectively.
On the insulating paper 31, magnetic layers 41 are provided on both left and right side surfaces of the segment coils 21 to 24, on inner side surfaces in a radial direction of the segment coil 21, and on outer side surfaces in the radial direction of the segment coil 24 so as to surround the segment coils 21 to 24 when viewed in the axial direction of the stator core 12, on a surface opposite to a surface facing the segment coils 21 to 24. The insulating paper 32 may be provided with a magnetic layer 42 so as to surround the segment coils 25 to 28 in the same manner.
Here, the segment coil 21 and the segment coil 22 are, for example, U-phase and in-phase. The segment coil 23 and the segment coil 24 are, for example, V-phase and in-phase, and are in a phase different from that of the segment coils 21 and 22.
Thus, the segment coils 21 and 22 in the same phase and the segment coils 23 and 24 in the same phase can shorten the distance between the segment coils, and the insulating paper 31 can secure the insulating distance between the segment coils 22 and 23 in the different phases. Therefore, the distance between the segment coils of the same phase is shortened while the segment coils of different phases are reliably insulated from each other, and the space factor is improved.
In the present embodiment, the insulating sheets 31 to 34 are arranged in a substantially S-shape when viewed from the axial direction of the stator core 12, but may be arranged in an inverted S-shape with the left and right sides reversed.
[ third embodiment ]
Next, a stator 10 of a rotating electric machine according to a third embodiment of the present invention will be described with reference to fig. 11 to 12. In the following description, the same components as those of the stator 10 of the rotating electric machine according to the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted or simplified.
As shown in fig. 11, 1 insulating paper 31 made of an insulating member is provided in the slot 16 of the stator 10 of the rotating electric machine according to the present embodiment. The insulating paper 31 is disposed so as to surround the segment coils 21 to 28 from the opening 16b of the slot 16 toward the left side wall 16c, the bottom wall 16d, and the right side wall 16a, and to return to the opening 16b, when viewed in the axial direction of the stator core 12.
On the insulating paper 31, magnetic layers 41 are provided on both left and right side surfaces of the segment coils 21 to 28, on inner side surfaces in a radial direction of the segment coil 21, and on outer side surfaces in the radial direction of the segment coil 28 so as to surround the segment coils 21 to 28 when viewed in the axial direction of the stator core 12, on a surface opposite to a surface facing the segment coils 21 to 28.
Thus, eddy currents generated in the segment coils 21 to 28 can be reduced, and eddy current loss can be reduced easily.
As shown in fig. 12, the insulating paper 31 may be arranged to surround the segment coils 21 to 28 from the bottom wall 16d of the slot 16 toward the right side wall 16a, the opening 16b, and the left side wall 16c and return to the bottom wall 16d, when viewed in the axial direction of the stator core 12.
In this case, the magnetic layers 41 are provided on the insulating paper 31 on the left and right side surfaces of the segment coils 21 to 28, the radially inner surface of the segment coil 21, and the radially outer surface of the segment coil 28 so as to surround the segment coils 21 to 28 when viewed in the axial direction of the stator core 12 on the surface opposite to the surface facing the segment coils 21 to 28.
Thus, eddy currents generated in the segment coils 21 to 28 can be reduced, and eddy current loss can be reduced easily.
According to the first to third embodiments, the insulating papers 31 to 34 can be arranged with a high degree of freedom in the slot 16. Since the magnetic layers 41 to 44 are provided integrally with the insulating papers 31 to 34, the magnetic layers 41 to 44 can be arranged with a high degree of freedom, and the magnetic layers can be arranged efficiently.
The above embodiment can be modified or improved as appropriate. For example, the insulating paper 31 may be arranged in a substantially 6-shape or a substantially inverted 6-shape in the slot 16. In the second embodiment, the end portions of the insulating paper 31 are disposed on the side walls 16a, 16c of the slot 16 when viewed in the axial direction of the stator core 12, but may be disposed so as to be wound around between the segment coils 21 and 22. Since the end of the insulating paper 31 is sandwiched between the segment coil 21 and the segment coil 22, the position of the insulating paper 31 is stabilized when the insulating paper 31 is placed in the slot 16, and productivity is improved.
In the present specification, at least the following matters are described. Note that, although the corresponding components and the like in the above-described embodiments are shown in parentheses, the present invention is not limited to these.
(1) A stator (stator 10) of a rotating electric machine is provided with:
a stator core (stator core 12) having a plurality of slots (slots 16) formed therein; and
a coil (coil 20) including a plurality of segment coils (segment coils 21-28) inserted in each of the plurality of slots, wherein,
in each of the slots, at least one piece of insulating paper (insulating paper 31-34) is arranged to surround two or more segment coils when viewed from the axial direction,
magnetic layers (magnetic layers 41-44) are provided on at least one of the insulating papers.
According to (1), in each slot, at least one piece of insulating paper is arranged so as to surround two or more segment coils when viewed from the axial direction, and the magnetic body layer is provided on the insulating paper, so that leakage magnetic flux flowing from the rotor side of the rotating electric machine to the stator core side in the circumferential direction flows to the magnetic body layer more than the segment coils. Therefore, the magnetic flux flowing through the segment coil can be reduced, and thus the generation of eddy current in the segment coil can be reduced, and the eddy current loss can be reduced. Further, since the magnetic layer is provided on the insulating paper, it is not necessary to use a plurality of types of segment coils divided by the presence or absence of the covering of the magnetic layer, and productivity when the segment coils are inserted into the slots is improved. Further, since the magnetic layer is provided on the insulating paper, the magnetic layer has a high degree of freedom in design, and the magnetic layer can be efficiently disposed.
(2) The stator of a rotating electric machine according to (1), wherein,
at least one piece of the insulating paper is disposed so as to surround two or more segment coils including the segment coil (segment coil 21) disposed at the radially innermost position of the slot, and the magnetic layer is provided at least on the opening (opening 16b) side of the slot.
According to (2), since the insulating paper is disposed so as to surround two or more segment coils including the segment coil disposed on the radially innermost side of the slot and the magnetic layer is provided at least at the opening of the slot, it is possible to reduce the magnetic flux flowing to the segment coil in which the leakage flux flowing from the rotor side of the rotating electric machine to the stator core side in the circumferential direction is largest and which is disposed on the radially innermost side. This can more effectively reduce the loss due to the eddy current.
(3) The stator of a rotating electric machine according to (1) or (2), wherein,
the magnetic layer is disposed inside an axial end of the stator core.
According to (3), since the magnetic layer is disposed at a position inside the axial end portion of the stator core, conduction between the segment coils outside the stator core and conduction between the segment coils and the stator core do not occur via the magnetic layer, and the segment coils and the stator core can be reliably insulated from each other.
(4) The stator of a rotating electric machine according to any one of (1) to (3),
the magnetic body layer is divided into a plurality of magnetic layers in the axial direction.
According to (4), since the magnetic layer is divided into a plurality of magnetic layers in the axial direction, the axial conduction of the stator core by the magnetic layers can be reduced, and the loss due to the axial conduction of the stator core can be reduced.
(5) The stator of a rotating electric machine according to any one of (1) to (4),
at least one of the insulating papers has a protective layer (protective layer 61) made of an insulating material on the outer surface of the magnetic layer.
According to (5), since the protective layer made of the insulating material is integrally provided on the outer surface of the magnetic layer of at least one sheet of insulating paper, the magnetic layer can be prevented from being damaged, and the stator core and the magnetic layer can be prevented from being electrically connected.
(6) The stator of a rotating electric machine according to any one of (1) to (4),
at least one of the insulating papers has an insertion-improving layer (insertion-improving layer 71) made of an insulating material on the outermost layer.
According to (6), since the insertion-improving layer made of the insulating material is integrally provided on the outermost layer of at least one sheet of the insulating paper, the insulating paper and the magnetic layer do not come into contact with the slot when the insulating paper and the magnetic layer are disposed in the slot, but the insertion-improving layer comes into contact with the slot, so that the insulating paper and the magnetic layer can be smoothly disposed, and productivity is improved.
(7) The stator of a rotating electric machine according to any one of (1) to (4),
at least one of the insulating papers has a foamed adhesive layer (foamed adhesive layer 81) on the outermost layer.
According to (7), since at least one of the insulating papers has a foamed adhesive layer on the outermost layer, the coil, the insulating paper, and the magnetic layer are fixed in the slot by foaming the foamed adhesive layer. Therefore, a step of fixing the coil, the insulating paper, and the magnetic layer to the slot with varnish or the like is not required, and productivity is improved.
(8) The stator of a rotating electric machine according to any one of (1) to (7),
in each of the slots, at least one set of a first segment coil (segment coil 21) and a second segment coil (segment coil 22) are arranged adjacent to each other in the radial direction,
at least one sheet of the insulating paper is arranged in a substantially B-shape when viewed from the axial direction, by surrounding the outer periphery of the first segment coil from between the first segment coil and the second segment coil toward one side wall (right side wall 16a), the opening (opening 16B), and the other side wall (left side wall 16c) of the slot, surrounding the outer periphery of the second segment coil toward the other side wall, the bottom wall (bottom wall 16d), and the one side wall of the slot, and returning to between the first segment coil and the second segment coil.
According to (8), since at least one piece of insulating paper is arranged in a substantially B-shape so as to surround the first segment coil and the second segment coil and overlap between the first segment coil and the second segment coil, the insulating distance between the first segment coil and the second segment coil can be increased. Further, since the both end portions of the insulating paper are sandwiched between the first segment coil and the second segment coil when viewed in the axial direction of the stator core, the insulating paper and the first segment coil and the second segment coil can be arranged in the slots without being displaced, and productivity is improved.
(9) The stator of a rotating electric machine according to any one of (1) to (7),
in each of the slots, at least two sets of first segment coils (segment coils 21, 23) and second segment coils (segment coils 22, 24) are arranged adjacent to each other in the radial direction,
at least one piece of the insulating paper is arranged in a substantially B-shape when viewed from the axial direction, from between the first segment coil (segment coil 21) and the second segment coil (segment coil 22) of the first group and the first segment coil (segment coil 23) and the second segment coil (segment coil 24) of the second group, to one side wall (right side wall 16a), the opening (opening 16B), and the other side wall (left side wall 16c) of the slot, around the outer peripheries of the first segment coil and the second segment coil of the first group, and to the other side wall, the bottom wall (bottom wall 16d), and the one side wall of the slot, around the outer peripheries of the first segment coil and the second segment coil of the second group, and back to between the first segment coil and the second segment coil of the first group and the first segment coil and the second segment coil of the second group,
the first and second segment coils of the first set are in phase,
the first segment coil and the second segment coil of the second group are in phase,
the first and second segmented coils of the first set that are in phase are out of phase with the first and second segmented coils of the second set that are in phase.
According to (9), since at least one piece of insulating paper is arranged in a substantially B-shape when viewed from the axial direction so as to surround the first and second segment coils of the first group and the first and second segment coils of the second group and overlap between the first and second segment coils of the first group and the first and second segment coils of the second group, the distance between the segment coils can be shortened by the first and second segment coils of the first group and the second segment coils of the second group in the same phase, and the insulating distance by the thickness of two pieces of insulating paper can be secured between the segment coils of the first group and the segment coils of the second group in different phases. Therefore, the space factor is improved by shortening the distance between the segment coils of the same phase while reliably insulating the segment coils of different phases from each other.
(10) The stator of a rotating electric machine according to any one of (1) to (7),
in each of the slots, at least one set of a first segment coil (segment coil 21) and a second segment coil (segment coil 22) are arranged adjacent to each other in the radial direction,
at least one sheet of the insulating paper is arranged in a substantially S-shape when viewed from the axial direction, such that the insulating paper surrounds the outer periphery of the first segment coil toward one side wall (left side wall 16c), the opening (opening 16b), and the other side wall (right side wall 16a) of the slot, passes between the first segment coil and the second segment coil, and surrounds the outer periphery of the second segment coil toward the one side wall, the bottom wall (bottom wall 16d), and the other side wall of the slot.
According to (10), at least one sheet of insulating paper is arranged in a substantially S-shape when viewed from the axial direction so as to surround the outer peripheral portion of the first segment coil toward one side wall, the opening portion side, and the other side wall of the slot, pass between the first segment coil and the second segment coil, and surround the outer peripheral portion of the second segment coil toward one side wall, the bottom wall side, and the other side wall of the slot. Therefore, the amount of insulating paper used can be reduced, and the manufacturing cost can be reduced.
(11) The stator of a rotating electric machine according to any one of (1) to (7),
in each of the slots, at least two sets of first segment coils (segment coils 21, 23) and second segment coils (segment coils 22, 24) are arranged adjacent to each other in the radial direction,
at least one sheet of the insulating paper is arranged in a substantially S-shape when viewed from the axial direction by surrounding the outer peripheries of the first segment coil (segment coil 21) and the second segment coil (segment coil 22) of the first group toward one side wall (left side wall 16c), the opening (opening 16b), and the other side wall (right side wall 16a) of the slot, passing between the first segment coil and the second segment coil of the first group and the first segment coil (segment coil 23) and the second segment coil (segment coil 24) of the second group, and surrounding the outer peripheries of the first segment coil and the second segment coil of the second group toward the one side wall, the bottom wall (bottom wall 16d), and the other side wall of the slot,
the first and second segment coils of the first set are in phase,
the first segment coil and the second segment coil of the second group are in phase,
the first and second segmented coils of the first set that are in phase are out of phase with the first and second segmented coils of the second set that are in phase.
According to (11), at least one piece of insulating paper surrounds the outer peripheries of the first segment coil and the second segment coil of the first group toward one side wall, the opening portion side, and the other side wall of the slot, and passes between the first segment coil and the second segment coil of the first group and the first segment coil and the second segment coil of the second group, and the outer peripheries of the first segment coil and the second segment coil of the second group are surrounded to one side wall, the bottom wall side and the other side wall of the slot, so that the first and second segment coils of the first group and the second group in the same phase are arranged in a substantially S-shape when viewed from the axial direction, whereby the distance between the segment coils can be shortened, and the segment coils of the first group and the segment coils of the second group which are different in phase can be reliably insulated by the insulating paper. Therefore, the space factor is improved by shortening the distance between the segment coils of the same phase while reliably insulating the segment coils of different phases from each other.
Claims (23)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-048498 | 2018-03-15 | ||
| JP2018048498A JP2019161951A (en) | 2018-03-15 | 2018-03-15 | Rotating electrical machine stator |
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| Publication Number | Publication Date |
|---|---|
| CN110277856A CN110277856A (en) | 2019-09-24 |
| CN110277856B true CN110277856B (en) | 2021-07-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910169807.0A Expired - Fee Related CN110277856B (en) | 2018-03-15 | 2019-03-06 | Stator of a rotating electrical machine |
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| Country | Link |
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| JP (1) | JP2019161951A (en) |
| CN (1) | CN110277856B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4391319A1 (en) * | 2022-12-22 | 2024-06-26 | Valeo eAutomotive Germany GmbH | Method for producing a stator for an electric rotating machine, stator, electric rotating machine and vehicle |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018219816A1 (en) * | 2018-11-19 | 2020-05-20 | Mahle International Gmbh | Electrical machine, in particular for a vehicle |
| DE102018219819A1 (en) * | 2018-11-19 | 2020-05-20 | Mahle International Gmbh | Electrical machine, in particular for a vehicle |
| JP7537603B2 (en) * | 2021-04-02 | 2024-08-21 | 日産自動車株式会社 | Stator |
| CN116488377B (en) * | 2023-06-20 | 2023-09-22 | 天蔚蓝电驱动科技(江苏)有限公司 | Motor stator and manufacturing method thereof |
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| JPS61177143A (en) * | 1985-01-30 | 1986-08-08 | Hitachi Ltd | Manufacture of magnetic wedge of rotary electric machine |
| JP2009195009A (en) * | 2008-02-14 | 2009-08-27 | Hitachi Ltd | Rotating electric machine |
| CN104620474A (en) * | 2012-09-13 | 2015-05-13 | 丰田自动车株式会社 | Stator of rotating electric machine |
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| WO1996041909A1 (en) * | 1995-06-08 | 1996-12-27 | Weijun Yin | Pulsed voltage surge resistant magnet wire |
| US20040143956A1 (en) * | 2003-01-29 | 2004-07-29 | Haller Lisa K. | Method and apparatus for insertion of stator core liners |
| JP5201551B2 (en) * | 2008-08-06 | 2013-06-05 | 株式会社Ｉｈｉ | Superconducting coil and magnetic field generator |
| JP2010220387A (en) * | 2009-03-17 | 2010-09-30 | Toyota Motor Corp | Stator |
| CN103401327A (en) * | 2012-01-06 | 2013-11-20 | 刘刚 | Stator and generator |
| JP5696694B2 (en) * | 2012-08-01 | 2015-04-08 | トヨタ自動車株式会社 | Rotating electric machine stator |
| JP2014057462A (en) * | 2012-09-13 | 2014-03-27 | Toyota Motor Corp | Stator of rotary electric machine |
| EP2933901B1 (en) * | 2014-04-15 | 2016-10-26 | Siemens Aktiengesellschaft | Stator of an electric machine and production thereof |
| US11183898B2 (en) * | 2016-07-08 | 2021-11-23 | Hitachi Industrial Equipment Systems Co., Ltd. | Rotary electric machine and manufacturing method for rotary electric machine |
-
2018
- 2018-03-15 JP JP2018048498A patent/JP2019161951A/en active Pending
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2019
- 2019-03-06 CN CN201910169807.0A patent/CN110277856B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61177143A (en) * | 1985-01-30 | 1986-08-08 | Hitachi Ltd | Manufacture of magnetic wedge of rotary electric machine |
| JP2009195009A (en) * | 2008-02-14 | 2009-08-27 | Hitachi Ltd | Rotating electric machine |
| CN104620474A (en) * | 2012-09-13 | 2015-05-13 | 丰田自动车株式会社 | Stator of rotating electric machine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4391319A1 (en) * | 2022-12-22 | 2024-06-26 | Valeo eAutomotive Germany GmbH | Method for producing a stator for an electric rotating machine, stator, electric rotating machine and vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110277856A (en) | 2019-09-24 |
| JP2019161951A (en) | 2019-09-19 |
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