Stator winding of rotating electric machine and rotating electric machine

Abstract

The stator winding (1) of a rotating electric machine is wound in multiple layers around the stator (10) of the rotating electric machine (50). The stator winding (1) includes multiple flat wires (2), which are concentratedly wound around the teeth (13) of the stator (10) by a flatwise bending method. A transposition section (3) that transposes the arrangement of the multiple flat wires (2) by 180° is provided between a layer end section (AE) where the winding of layer A, which is one layer closer to the teeth (13) than the outermost circumference, ends and a layer start section (BS) of layer B, which is the next layer to be wound around layer A.

Description

[Technical field]

[0001] The present disclosure relates to a stator winding of a rotating electric machine and a rotating electric machine. [Background technology]

[0002] Conventionally, electric motors have been proposed in which a stator core is provided with multiple teeth, stator windings are wound around the teeth in a concentrated manner, and power is supplied to the stator windings to generate torque in a rotor configured across an air gap, thereby rotating the rotor.Also proposed is a generator that outputs generated power from the stator windings by rotating the rotor, which is arranged across an air gap from the stator, using external power.

[0003] Stator windings used in rotating electric machines such as electric motors and generators use so-called loose windings, in which arbitrary strands of wire are wound arbitrarily, in relatively small rotating electric machines, but large rotating electric machines with large capacity use die-wound windings. This is because in large-capacity rotating electric machines, the current flowing through each winding is large, so the cross-sectional area of ​​the winding needs to be large, and the voltage becomes high, so an insulating layer is required. Die-wound windings are made of windings made of multiple bundles of rectangular strands of wire with a cross section of a rectangular shape.

[0004] When a stator winding made of multiple rectangular wires is wound around a stator multiple times, i.e., when it is wound in multiple layers, if the wires are in the same position in the cross section of all the stator windings, an induced voltage difference occurs between the wires due to the magnetic flux linking between them. Normally, the wires are connected together at the end of the stator winding every time one tooth or multiple teeth are wound, so the voltage difference induced between the wires generates a circulating current between the wires, which causes problems such as reduced efficiency and increased temperature of the winding.

[0005] For this reason, for example, Patent Document 1 discloses an example in which a stator winding of a rotating electric machine, in which one stator winding is made up of multiple rectangular wires, is concentrated around a stator tooth, and the stator winding made up of multiple rectangular wires is twisted (transposed). That is, the stator winding of the rotating electric machine disclosed in Patent Document 1 aims to reduce circulating current loss by twisting the arrangement of each wire by 180° while winding it around one tooth. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. WO2021 / 024518 Summary of the Invention [Problem to be solved by the invention]

[0007] In rotating electrical machines, improving the winding space factor makes it possible to reduce winding resistance and increase the number of turns, thereby improving efficiency. For this reason, since the transposition part in the stator winding of the rotating electrical machine disclosed in Patent Document 1 causes a larger winding bulge compared to the winding part other than the transposition part, a device is devised to arrange the transposition part in the outermost layer and at the coil end part in order to improve the winding space factor.

[0008] When the stator winding is concentrated on the stator teeth and wound only one layer around the stator teeth, it is effective because transposition is possible without decreasing the winding space factor even in the arrangement position of the transposition part as described in Patent Document 1. However, when the stator winding is wound in multiple layers, that is, when a stator winding is wound on top of a wound stator winding, it is necessary to wind the winding separately into a winding on the tip side of the teeth and a winding on the bottom side, and finally form the transposition part, which causes a problem of significantly deteriorating workability.

[0009] Furthermore, the stator winding of the rotating electric machine disclosed in Patent Document 1 is wound around a rectangular wire by edgewise bending, i.e., by bending the short side of the cross section of the rectangular wire. Therefore, compared to a stator winding wound around a rectangular wire by flatwise bending, i.e., a stator winding wound by bending the long side of the cross section of the rectangular wire, the stator winding of Patent Document 1 has a problem of increased winding bulge and reduced winding space factor.

[0010] An object of the present disclosure is to provide a stator winding for a rotating electric machine that is easier to work with and has an improved winding space factor than conventional stator windings. [Means for solving the problem]

[0011] The stator winding of the rotating electric machine according to the present disclosure is wound in multiple layers around a stator of the rotating electric machine. The stator winding includes multiple rectangular wires, which are wound in a concentrated manner around the teeth of the stator by a flatwise bending method. Each layer of the stator winding is formed by winding a plurality of rectangular wires around the teeth in the radial direction of the rotating electrical machine. The stator winding of a rotating electric machine is Layer A transposition section is provided between the end of layer A, which is one layer closer to the teeth, and the start of layer B, which is the next layer to be wound around the outer periphery of layer A, which transposes the arrangement of multiple rectangular wires by 180°. Effect of the Invention

[0012] In the stator winding of a rotating electric machine disclosed herein, a plurality of flat rectangular wires are wound in a concentrated manner around the teeth of the stator using a flatwise bending method, and a transposition is provided between the end of one layer and the start of the next layer, thereby improving workability and the winding space factor compared to conventional methods. [Brief description of the drawings]

[0013] [Figure 1] 1 is a schematic configuration diagram showing a stator winding of a rotating electric machine according to a first embodiment. [Diagram 2] 2 is a diagram showing a first example of the stator winding and a transposition portion of FIG. 1. [Diagram 3] FIG. 2 is a diagram showing a second example of the stator winding of FIG. [Figure 4] FIG. 2 is a diagram showing a third example of the stator winding of FIG. [Diagram 5] 2 is a diagram showing a schematic diagram of the direction of main magnetic flux linking the stator winding of FIG. 1. FIG. [Figure 6] 2 is a diagram showing a schematic diagram of a direction of a sublinkage magnetic flux that links with the stator winding of FIG. 1. [Figure 7] FIG. 13 is a diagram showing a stator winding of a comparative example. [Figure 8] 11 is a schematic configuration diagram showing a stator winding of a rotating electric machine according to a second embodiment. FIG. [Figure 9] 9 is a diagram showing a transposition portion when the stator winding in FIG. 8 has three layers. [Figure 10] 9 is a diagram showing a transposition portion when the stator winding in FIG. 8 has four layers. [Figure 11] 9 is a diagram showing a transposition portion when the stator winding in FIG. 8 has five layers. [Figure 12] 11 is a schematic configuration diagram showing a stator winding for which an electromagnetic field analysis is performed according to a second embodiment. FIG. [Figure 13] FIG. 13 is a diagram showing average loss when the number and positions of the dislocations in FIG. 12 are changed. [Figure 14] FIG. 13 is a diagram showing the loss of each flat wire when the number and positions of the transposition parts in FIG. 12 are changed. [Figure 15] FIG. 13 is a diagram showing the loss of each flat wire when the number and positions of the transposition parts in FIG. 12 are changed. [Figure 16] FIG. 13 is a diagram showing the loss of each flat wire when the number and positions of the transposition parts in FIG. 12 are changed. [Figure 17] FIG. 13 is a diagram showing the loss of each flat wire when the number and positions of the transposition parts in FIG. 12 are changed. [Figure 18] FIG. 13 is a diagram showing the loss of each flat wire when the number and positions of the transposition parts in FIG. 12 are changed. [Figure 19] FIG. 11 is a schematic configuration diagram showing a stator winding of a rotating electric machine according to a third embodiment. [Figure 20]FIG. 11 is a schematic configuration diagram showing a stator winding of a rotating electric machine according to a fourth embodiment. [Figure 21] FIG. 13 is a diagram showing the configuration of a rotating electric machine according to a fifth embodiment. [Figure 22] FIG. 22 illustrates the phase ring conductor of FIG. 21. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Embodiment 1 FIG. 1 is a schematic diagram showing a stator winding of a rotating electric machine according to the first embodiment, and FIG. 2 is a diagram showing a first example of the stator winding and a transposition portion of FIG. 1. FIG. 3 is a diagram showing a second example of the stator winding of FIG. 1, and FIG. 4 is a diagram showing a third example of the stator winding of FIG. 1. FIGS. 5 and 6 are diagrams each showing a schematic diagram of a main interlinkage magnetic flux direction interlinked with the stator winding of FIG. 1. FIG. 7 is a diagram showing a stator winding of a comparative example. A rotating electric machine 50 according to the first embodiment includes a stator 10 and a rotor 20. The rotor 20 is provided with a plurality of permanent magnets 27 on the surface of a rotor core 26 (see FIG. 21). The stator 10 includes a stator core 11 having a plurality of teeth 13 arranged on the outside of the rotor 20 with a gap 21 therebetween, and a stator winding 1 wound around each of the teeth 13. The stator core 11 includes teeth 13 and a core back 12 supporting the teeth 13. The rotating electric machine 50 is an electric motor or a generator.

[0015] As shown in FIG. 2, the stator winding 1 includes a plurality of flat wires 2, which are wound around the teeth 13 of the stator 10 in a concentrated manner by flatwise bending. FIG. 2 shows an example of the stator winding 1 made up of eight flat wires 2. The flatwise bending is a bending method in which the long side 6a of the cross section of the flat wire 2 has a long side width wl longer than the short side width ws of the short side 6b. The stator winding 1 is wound around the teeth 13 of the stator 10 in a concentrated manner, and the first layer LA1 is wound in the order of winding number 1 to winding number 10 from the winding start portion COS. In FIG. 1, winding numbers 1 to 10 are given on the cross section of the stator winding 1. Winding numbers 11 to 20 are also given on the cross section of the stator winding 1. Between the layer end LE1 of the first layer LA1 with the winding number 10 and the layer start LS2 of the second layer LA2 with the winding number 11, the arrangement of the flat wires 2 of the stator winding 1 is transposed by 180° by the transposition unit 3. The second layer LA2 of the stator winding 1 is formed by winding the flat wires 2 around the outer periphery of the first layer LA1 in the order of winding numbers 11 to 20 with the arrangement of the flat wires 2 transposed by 180°. The layer end LE2 of the second layer LA2 with the winding number 20 is the winding end COE of the stator winding 1. The winding start COS is also the layer start LS1 of the stator winding 1. The stator winding 1 can also be expressed as being wound flatwise around the flat wires 2. Winding or winding "by the flatwise bending method" is appropriately expressed as winding or winding "flatwise". Furthermore, the flatwise bending method will be referred to as "flatwise bending" and the edgewise bending method will be referred to as "edgewise bending" as appropriate.

[0016] FIG. 1 shows an example in which the stator winding 1 has two layers, i.e., two layers, but the number of layers of the stator winding 1 may be three or more. If the layer immediately before the transposition portion 3 is arranged is called layer A, and the layer immediately after the transposition portion 3 is arranged is called layer B, the transposition portion 3 can be expressed as follows. The transposition portion 3 transposes the arrangement of the flat wires 2 by 180° between the layer end portion where the winding of layer A, which is one layer closer to the teeth 13 than the outermost circumference, ends, i.e., layer A end portion AE, and the layer start portion of layer B, which is the next layer to be wound around layer A, i.e., layer B start portion BS. In FIG. 1, layer A, layer B, layer A end portion AE, and layer B start portion BS are the first layer LA1, second layer LA2, layer end portion LE1, and layer start portion LS2, respectively.

[0017] FIG. 2 shows an example in which the number of flat wires 2 is eight. In the first layer LA1 of the stator winding 1, the flat wires 2 are numbered 1 to 8. The flat wires 2 with odd wire numbers 1, 3, 5, and 7 are arranged on the tip side of the teeth 13, i.e., the rotor 20 side, and the flat wires 2 with even wire numbers 2, 4, 6, and 8 are arranged on the core back 12 side of the stator core 11. Since each flat wire 2 is bent by the flatwise bending method and wound around the teeth 13, the long side 6a of each flat wire 2 having the long side width wl faces the teeth 13. The short side 6b of each flat wire 2 having the short side width ws faces the rotor 20 or the core back 12.

[0018] The arrangement positions of the flat wires 2 in the second layer LA2 of the stator winding 1 transposed 180° by the transposition unit 3 are changed to wire numbers 8 to 1, compared to wire numbers 1 to 8, which are the arrangement positions of the flat wires 2 in the first layer LA1 of the stator winding 1 before transposition. More specifically, the arrangement is as follows. After the transposition, the flat wire 2 with wire number 8 in the second layer LA2 is arranged at the position of the flat wire 2 with wire number 1 in the first layer LA1. Similarly, after the transposition, the flat wires 2 with wire numbers 6, 4, and 2 in the second layer LA2 are arranged at the positions of the flat wires 2 with wire numbers 3, 5, and 7 in the first layer LA1. After the transposition, the flat wire 2 with wire number 7 in the second layer LA2 is arranged at the position of the flat wire 2 with wire number 2 in the first layer LA1. Similarly, after transposition, the flat wires 2 with wire numbers 5, 3, and 1 in the second layer LA2 are arranged at the positions of the flat wires 2 with wire numbers 4, 6, and 8 in the first layer LA1. The rotation of the arrangement positions of the flat wires 2 shown in Figure 2 is called a 180° transposition.

[0019] 1 shows an example in which the winding start COS and winding end COE of the stator winding 1 are on the air gap 21 side and are configured with two layers, but the positions of the winding start COS and winding end COE of the stator winding 1 are not limited to this. The winding start COS and winding end COE of the stator winding 1 may be located on the core back side. The stator winding 1 may have two or more layers, but the transposition portion 3, which is the portion where the transposition occurs, transposes between the layer end (layer A end AE), which is the end of the winding of one layer, and the layer start (layer B start BS), which is the start of the winding of the next layer.

[0020] Here, the stator winding 1 may be, for example, a plurality of flat wires 2 having a rectangular cross section arranged so that the long sides 6a of the rectangular cross section are in contact as shown in Fig. 3, or a plurality of flat wires 2 arranged so that the short sides 6b of the rectangular cross section are in contact as shown in Fig. 4. Furthermore, as shown in Fig. 2, a plurality of flat wires 2 may be arranged in the direction in which the long sides 6a of the rectangular cross section are in contact, and a plurality of flat wires 2 may also be arranged in the direction in which the short sides 6b are in contact.

[0021] The stator winding 1 can also be described as having a transposition section 3 where the arrangement position of each rectangular wire 2, i.e., the wire arrangement, is transposed by 180° between the layer end section (layer A end section AE), which is the end of the winding of one layer, and the layer start section (layer B start section BS), which is the start of the winding of the layer following that layer.

[0022] It can also be expressed that the arrangement of corresponding flat wires 2 in the stator winding 1 is shifted by 180° between one flatwise wound layer and an adjacent layer. A state in which the arrangement of corresponding flat wires 2 in the stator winding 1 is shifted by 180° means that, when multiple flat wires 2 are arranged so that their long sides 6a of the rectangular cross section are in contact, the arrangement order from the side closer to the teeth 13 of the stator 10 is reversed between adjacent flat wires 2. When multiple flat wires 2 are arranged so that their short sides 6b of the rectangular cross section are in contact, the arrangement of corresponding flat wires 2 in the stator winding 1 is reversed between adjacent flat wires 2.

[0023] When the voltage is increased to realize a larger capacity of the rotating electric machine 50, it is necessary to improve the insulation reliability between the stator winding 1 and the stator core 11, and the insulating coating of the stator winding 1 must be thickened. When the current is increased to realize a larger capacity of the rotating electric machine 50, it is necessary to reduce the winding resistance of the stator winding 1 and reduce the copper loss by increasing the cross-sectional area of ​​the stator winding 1. However, when the cross-sectional area of ​​the stator winding 1 is increased, eddy current loss occurs in the winding conductor, and the loss increases. In the rotating electric machine 50, the main interlinkage magnetic flux, which is the main interlinkage magnetic flux, is in the direction indicated by the arrow 22a in FIG. 5, and when this main interlinkage magnetic flux interlinks with the stator winding 1, eddy current loss occurs in the winding if the winding has a large cross-sectional area. For this reason, the stator winding 1 is divided into a plurality of strands, i.e., rectangular strands 2, to reduce the eddy current loss.

[0024] 7 shows a comparative example of a stator winding 61 in the case where a general stator winding is divided into multiple flat wires 2. In general, as in the comparative example of the stator winding 61, this is often addressed by increasing the division in the radial direction R of the rotating electric machine 50 and decreasing the division in the circumferential direction Φ of the rotating electric machine 50 so as to reduce the interlinkage magnetic flux in the direction indicated by the arrow 22a in one flat wire 2. For this reason, edgewise bending is generally adopted for the flat wire 2 when the stator winding 61 is wound around the teeth 13 of the stator 10.

[0025] Since the flat wire 2 of the stator winding is made of a metal such as copper, when the flat wire 2 is wound around the teeth 13 while being bent edgewise, the stator winding 61 swells, and the winding space factor of the stator winding 61 in the slot of the stator decreases. In particular, in a large rotating electric machine in which one flat wire 2 is large, the decrease in the winding space factor due to edgewise bending becomes a significant problem. For this reason, bending the flat wire 2 flatwise improves the workability and the winding space factor. However, when flatwise bending is performed, many interlinking magnetic fluxes interlink the flat wire 2, which increases eddy current loss, so that the flat wire 2 needs to be divided into multiple parts in the radial direction R in the stator winding 1. For this reason, the stator winding 1 of the first embodiment shows an example in which the number of flat wires 2 in the radial direction R of the rotating electric machine 50, i.e., the number of radial divisions, is set to 2, and the number of flat wires 2 in the circumferential direction Φ, i.e., the number of circumferential divisions, is set to 4.

[0026] In rotating electric machine 50 of the first embodiment, which is a rotating electric machine with concentrated stator windings, the sublinkage magnetic flux, which is the flux linkage magnetic flux in the direction of arrow 22b shown in Fig. 6, i.e., the flux linkage magnetic flux in a direction 90° different from the direction of arrow 22a in Fig. 5, is also relatively large. For this reason, when edgewise bending is adopted as in stator winding 61 of the comparative example, eddy current loss due to this sublinkage magnetic flux becomes large. In contrast, in stator winding 1 of the first embodiment, which employs flatwise bending, eddy current loss due to the sublinkage magnetic flux becomes small.

[0027] In addition to copper loss and eddy current loss, there is also circulating current loss as a loss that occurs in the stator winding 1. When there is interlinkage magnetic flux between the flat wires 2, a difference in voltage is induced between the flat wires 2, and a circulating current flows in response to this induced voltage difference so that the flat wires 2 in the stator winding 1 are at the same potential at the collective connection that collectively connects them. The loss that occurs when this circulating current flows is called circulating current loss.

[0028] That is, due to the main flux linkage and sub flux linkage shown in Figs. 5 and 6, if there is no transposition portion 3, a circulating current will be generated between the multiple flat wires 2 in the stator winding 1. A method of transposing (twisting) the stator winding is known to reduce this circulating current. This method aims to homogenize the magnetic flux linking between the flat wires 2 by changing the arrangement of the multiple flat wires 2 by transposing them by 180° as shown in Fig. 2. Therefore, since the stator winding 1 of the first embodiment is provided with the transposition portion 3 that transposes the arrangement of the multiple flat wires 2 by 180°, it is possible to reduce the circulating current and reduce the circulating current loss.

[0029] When multiple layers are concentratedly wound around the teeth 13 of the stator 10, as in the stator winding 1 of the first embodiment, the winding is generally performed in order from the inner layer. In this case, if a transposition portion is provided in the middle of the inner layer, i.e., the layer on the tooth 13 side, not at the layer start portion or the layer end portion, a winding bulge occurs in the stator winding wound on the transposition portion, and the winding space factor decreases. For this reason, in the stator winding 1 of the first embodiment, by performing a transposition at the winding end portion of the layer (end portion AE of layer A of layer A), it is possible to reduce the influence on the stator winding 1 wound on the transposition portion, and therefore it is possible to prevent a decrease in the winding space factor. The stator winding 1 of the first embodiment shown in FIG. 1 is an example in which the transposition portion 3 is arranged closer to the core back 12 than the end faces of the stator winding 1 on the core back 12 side, which are indicated by winding numbers 9, 10, 11, and 12.

[0030] In this way, in the stator winding 1 of embodiment 1, the multiple rectangular wires 2 included in the stator winding 1 are wound around the teeth 13 by flatwise bending, so that the workability of the stator winding 1 can be improved and the winding space factor can be improved compared to a conventional stator winding in which the wires are wound around the teeth 13 by edgewise bending. Also, the stator winding 1 of embodiment 1 has a transposition part 3 that is transposed 180° at the winding end part of the layer (layer A end part AE of layer A), so that the circulating current loss can be reduced.

[0031] As described above, the stator winding 1 of the rotating electric machine of the first embodiment is wound in multiple layers around the stator 10 of the rotating electric machine 50. The stator winding 1 includes multiple flat wires 2, which are concentratedly wound around the teeth 13 of the stator 10 by a flatwise bending method. The stator winding 1 of the rotating electric machine includes a transposition portion 3 that transposes the arrangement of the multiple flat wires 2 by 180° between a layer end portion (layer A end portion AE) where the winding of layer A, which is a layer closer to the teeth 13 than the outermost circumference, ends, and a layer start portion (layer B start portion BS) of layer B, which is the next layer to be wound around layer A. In the stator winding 1 of the rotating electric machine of embodiment 1, due to this configuration, a plurality of flat rectangular wires 2 are wound concentrically around the teeth 13 of the stator 10 by a flatwise bending method, and a transposition portion 3 is provided between the layer end portion of one layer (layer A end portion AE of layer A) and the layer start portion of the next layer (layer B start portion BS of layer B), thereby improving workability and the winding space factor compared to conventional methods.

[0032] The rotating electric machine 50 of the first embodiment includes a stator 10 and a rotor 20. The rotor 20 has a plurality of permanent magnets 27 on the surface of the rotor core 26. The rotor 20 may have one or more. In the case of a plurality of rotors, the plurality of permanent magnets 27 are provided on the surface of any one of the rotor cores 26. Furthermore, the plurality of permanent magnets 27 may not be provided on the surface, but may be embedded inside the rotor core 26. The stator 10 includes a stator core 11 having a plurality of teeth 13 arranged on the outside of the rotor 20 with a gap 21 therebetween, and a stator winding 1 wound around each of the teeth 13. The stator winding 1 is wound around the stator 10 of the rotating electric machine 50 in a plurality of layers, and includes a plurality of rectangular wires 2, which are concentratedly wound around the teeth 13 of the stator 10 by a flatwise bending method. The stator winding 1 has a transposition portion 3 that transposes the arrangement of the plurality of rectangular wires 2 by 180° between a layer end portion (layer A end portion AE) where winding of layer A, which is one layer closer to the teeth 13 than the outermost circumference, has ended, and a layer start portion (layer B start portion BS) of layer B, which is the next layer to be wound around layer A. With this configuration, the rotating electric machine 50 of the first embodiment has the plurality of rectangular wires 2 concentratedly wound around the teeth 13 of the stator 10 by the flatwise bending method, and has the transposition portion 3 between the layer end portion of one layer (layer A end portion AE of layer A) and the layer start portion of the next layer (layer B start portion BS of layer B). This improves the workability of the stator winding 1 compared to conventional methods, and improves the winding space factor of the stator winding 1.

[0033] Embodiment 2 FIG. 8 is a schematic diagram showing the stator winding of a rotating electric machine according to the second embodiment, and FIG. 9 is a diagram showing the transposition part when the stator winding in FIG. 8 has three layers. FIG. 10 is a diagram showing the transposition part when the stator winding in FIG. 8 has four layers, and FIG. 11 is a diagram showing the transposition part when the stator winding in FIG. 8 has five layers. FIG. 12 is a schematic diagram showing the stator winding for which an electromagnetic field analysis is performed according to the second embodiment, and FIG. 13 is a diagram showing the average loss when the number and position of the transposition parts in FIG. 12 are changed. FIGS. 14 to 18 are diagrams showing the loss of each rectangular wire when the number and position of the transposition parts in FIG. 12 are changed. The rotating electric machine 50 according to the second embodiment differs from the rotating electric machine 50 according to the first embodiment in that the number of layers of the stator winding 1 is three or more. The parts different from the rotating electric machine 50 according to the first embodiment will be mainly described.

[0034] As shown in Fig. 2, the stator winding 1 includes a plurality of flat wires 2, which are wound in a concentrated manner around the teeth 13 of the stator 10 by flatwise bending. The stator winding 1 is wound in a concentrated manner around the teeth 13 of the stator 10, and a first layer LA1 is formed by winding from a winding start portion COS in the order of winding number 1 to winding number 10. In Fig. 8, winding numbers 1 to 10 are given on a cross section of the stator winding 1. Winding numbers 11 to 30 are also given on a cross section of the stator winding 1. The second layer LA2 is also wound around the outer periphery of the first layer LA1 from winding number 11 to winding number 20 without being transposed. Between a layer end portion LE2 of the second layer LA2, which is assigned winding number 20, and a layer start portion LS3 of the third layer LA3, which is assigned winding number 21, the arrangement of the plurality of rectangular wires 2 of the stator winding 1 is transposed by 180° by a transposition portion 3. In the third layer LA3 of the stator winding 1, the arrangement of the plurality of rectangular wires 2 is transposed by 180° and the third layer LA3 is wound around the outer periphery of the second layer LA2 in the order of winding number 21 to winding number 30 to form the stator winding 1. The layer end portion LE3 of the third layer LA3, which is assigned winding number 30, is the winding end portion COE of the stator winding 1. There is one transposition portion 3 of the stator winding 1 for each tooth 13.

[0035] The stator winding 1 shown in Fig. 8 is an example in which the transposition portion 3 is disposed between the layer end portion LE2 of the second layer LA2 and the layer start portion LS3 of the third layer LA3. In Fig. 8, layer A, layer B, layer A end portion AE, and layer B start portion BS are the second layer LA2, the third layer LA3, the layer end portion LE2, and the layer start portion LS3, respectively. The stator winding 1 of the second embodiment shown in Fig. 8 is an example in which the transposition portion 3 is disposed closer to the core back 12 than the end faces of the stator windings 1 on the core back 12 side, as indicated by the winding numbers 1, 2, 19, 20, 21, and 22.

[0036] FIG. 9 shows a schematic diagram of the position of the transposition portion 3 when the number of layers of the stator winding 1 is three. In the case of a three-layer stator winding 1, the second layer LA2 corresponds to the central layer 4, which is the central layer. In the case of the three-layer stator winding 1 shown in FIG. 8 and FIG. 9, the transposition portion 3 is provided between the layer A end portion AE (layer end portion LE2 of the second layer LA2) of layer A and the layer B start portion BS (layer start portion LS3 of the third layer LA3) of layer B, on the outer side of the central layer portion 4, which is the central portion of the multiple layers of the stator winding 1. In FIG. 9, the stator winding after the transposition is indicated by the reference symbol 1a. Note that the stator winding after the transposition is also indicated by the reference symbol 1a in FIG. 10 and FIG. 11.

[0037] 10 and 11 show schematic positions of the transposition portion 3 when the number of layers of the stator winding 1 is four and five, respectively. The four-layer stator winding 1 is wound around the teeth 13 from the first layer LA1 to the fourth layer LA4. The five-layer stator winding 1 is wound around the teeth 13 from the first layer LA1 to the fifth layer LA5. In the case of the four-layer stator winding 1, the second layer LA2 and the third layer LA3 correspond to the central layer 4, which is the central layer. In the case of the five-layer stator winding 1, the third layer LA3 corresponds to the central layer 4, which is the central layer. In the case of the four-layer stator winding 1 shown in FIG. 10, the transposition portion 3 is provided outside the central layer 4, which is the central portion of the multiple layers of the stator winding 1, between the A-layer end portion AE (layer end portion of the third layer LA3) of the A-layer and the B-layer start portion BS (layer start portion of the fourth layer LA4) of the B-layer. In the case of the five-layer stator winding 1 shown in FIG. 11, the transposition portion 3 is provided outside the central layer portion 4, which is the center of the multiple layers of the stator winding 1, between the layer A end portion AE (layer end portion of the third layer LA3) of layer A and the layer B start portion BS (layer start portion of the fourth layer LA4) of layer B.

[0038] In a stator winding 1 having multiple layers, when a single transposition is performed, i.e., when a single transposition part 3 is provided, the loss is smaller when the transposition part 3 is provided between two layers outside the central layer part 4 or within the central layer part 4 than when the transposition part 3 is provided inside the central layer part 4. When the transposition part 3 is provided between two layers outside the central layer part 4 or within the central layer part 4, the transposition part 3 is provided on the outside including the central layer part 4.

[0039] FIG. 12 shows a schematic configuration of the stator winding 1 of a rotating electric machine for which an electromagnetic field analysis is performed. The stator winding 1 shown in FIG. 12 is composed of six flat wires 2 in total in three rows and two stages, and is wound in four layers around the teeth 13 of one stator 10. The number of turns in each layer is equal. The first layer LA1, the second layer LA2, the third layer LA3, and the fourth layer LA4 are wound in order from the side closest to the teeth 13. The second layer LA2 and the third layer LA3 correspond to the central layer 4. FIG. 13 shows the results of electromagnetic field analysis of six rotating electric machines equipped with the stator winding 1 shown in FIG. 12. The vertical axis of FIG. 13 is the average loss of the six standardized flat wires 2. The six samples S1 to S6 have different locations and numbers of 180° transpositions. Sample S1 is a case where there is no transposition. Sample S2 is a case where a transposition is performed between each layer, and a total of three transposition parts 3 are provided between the first layer LA1 and the second layer LA2, between the second layer LA2 and the third layer LA3, and between the third layer LA3 and the fourth layer LA4. In Fig. 13, the space between the first layer LA1 and the second layer LA2 is indicated as "1-2", the space between the second layer LA2 and the third layer LA3 is indicated as "2-3", and the space between the third layer LA3 and the fourth layer LA4 is indicated as "3-4".

[0040] Sample S3 is a case where one transposition part 3 is provided between the second layer LA2 and the third layer LA3. Sample S4 is a case where a total of two transposition parts 3 are provided between the first layer LA1 and the second layer LA2 and between the third layer LA3 and the fourth layer LA4. Sample S5 is a case where one transposition part 3 is provided between the first layer LA1 and the second layer LA2. Sample S6 is a case where one transposition part 3 is provided between the third layer LA3 and the fourth layer LA4. In addition, the flat wires 2 of the stator winding 1 are connected together every time the winding is completed around one tooth 13. The average loss on the vertical axis is normalized by the average loss value when 180° transposition is performed between all layers, that is, the average loss value of sample S2.

[0041] The dislocation between the second layer LA2 and the third layer LA3, labeled "2-3," is a dislocation within the central layer 4. The dislocation between the first layer LA1 and the second layer LA2, labeled "1-2," is a dislocation located inside the central layer 4. The dislocation between the third layer LA3 and the fourth layer LA4, labeled "3-4," is a dislocation located outside the central layer 4.

[0042] From FIG. 13, it can be seen that the average loss in the case where the transposition part 3 is provided outside the central layer part 4 of sample S6 is lower than the average loss in the case where the transposition part 3 is provided inside the central layer part 4 of sample S5. When the number of layers is even, two layers exist in the central layer part 4, so the average loss of sample S3, which is the case where the transposition is performed within the central layer part 4, is smaller than that of sample S6. Sample S4, which is the case where the transposition is performed at two places, has almost the same average loss as sample S2, which is the case where the transposition is performed between all layers. Sample S1, which is the case where there is no transposition, has a large circulating current loss, so that it is larger than the other samples S2 to S6. FIG. 13 shows the case where the number of layers of the stator winding 1 is 4. However, even when the number of layers of the stator winding 1 is 3 or 5 or more, if the stator winding 1 has only one transposition part 3, the loss is smaller when the transposition part 3 is provided outside including the central layer part 4 than when the transposition part 3 is provided inside the central layer part 4, as in samples S5 and S6.

[0043] 14 to 18 show a comparison of losses in the flat wires 2 in samples S2 to S6. The loss on the vertical axis is normalized by the average loss value of sample S2 shown in FIG. 13. Samples S5 and S6 are compared. In sample S5, which is transposed inside the central layer 4, the loss generated in the flat wires 2 with wire numbers 2 and 4 is large. In contrast, in sample S6, which is transposed outside the central layer 4, the loss in the flat wires 2 with wire numbers 2 and 4 is reduced. That is, when transposition is performed at one location, it is found that loss can be reduced by transposing between layers outside the central layer 4 of the multiple layers of the stator winding 1. It is found that sample S3, which is a case where transposition is performed within the central layer 4, has reduced losses in the flat wires 2 with wire numbers 2 and 4 compared to sample S5. FIGS. 14 to 18 show a case where the number of layers of the stator winding 1 is 4. However, even when the number of layers of the stator winding 1 is 3 or 5 or more, as long as the stator winding 1 has only one transposition portion 3, the loss in the flat wires 2 with wire number 2 and wire number 4 is smaller when the transposition portion 3 is provided on the outside including the central layer portion 4 than when the transposition portion 3 is provided on the inside of the central layer portion 4, as in samples S5 and S6.

[0044] The stator winding 1 of embodiment 2 has a plurality of flat wires 2 wound in a concentrated manner around the teeth 13 of the stator 10 by flatwise bending, and has a transposition portion 3 between a layer-A end portion AE of layer-A, which is one layer, and a layer-B start portion BS of layer-B, which is the next layer, so that it has the same effect as the stator winding 1 of embodiment 1. Also, in the stator winding 1 of embodiment 2, the transposition portion 3 is provided outside a central layer portion 4, which is the center portion of the multiple layers of the stator winding 1, between the layer-A end portion AE of layer-A and the layer-B start portion BS of layer-B, so that it can reduce losses more than when the transposition portion 3 is provided inside the central layer portion 4.

[0045] Since the rotating electric machine 50 of the second embodiment includes the stator winding 1 of the second embodiment, similarly to the rotating electric machine 50 of the first embodiment, the workability of the stator winding 1 is improved compared to the conventional art, and the winding space factor of the stator winding 1 is improved. Furthermore, due to the effect of the stator winding 1 of the second embodiment, the rotating electric machine 50 of the second embodiment can reduce losses more than when the transposition portion 3 is provided inside the central layer portion 4.

[0046] Embodiment 3 19 is a schematic configuration diagram showing a stator winding of a rotating electric machine according to embodiment 3. A rotating electric machine 50 according to embodiment 3 differs from rotating electric machines 50 according to embodiments 1 and 2 in that the number of layers of the stator winding 1 is an even number equal to or greater than four, and the outermost layer has a greater number of turns than the other layers. The following mainly describes the differences from rotating electric machine 50 according to embodiments 1 and 2.

[0047] As shown in FIG. 2, the stator winding 1 includes a plurality of flat wires 2, which are wound around the teeth 13 of the stator 10 in a concentrated manner by flatwise bending. The stator winding 1 is wound around the teeth 13 of the stator 10 in a concentrated manner, and the first layer LA1 is formed by winding from the winding start portion COS in the order of winding number 1 to winding number 10. In FIG. 19, winding numbers 1 to 10 are given on the cross section of the stator winding 1. Winding numbers 11 to 44 are also given on the cross section of the stator winding 1. The second layer LA2 is also wound around the outer periphery of the first layer LA1 without being transposed from winding number 11 to winding number 20. The third layer LA3 is also wound around the outer periphery of the second layer LA2 without being transposed from winding number 21 to winding number 30. Between a layer end portion LE3 of the third layer LA3, which is assigned winding number 30, and a layer start portion LS4 of the fourth layer LA4, which is assigned winding number 31, the arrangement of the plurality of flat wires 2 of the stator winding 1 is transposed by 180° by the transposition portion 3. In the fourth layer LA4 of the stator winding 1, the arrangement of the plurality of flat wires 2 is transposed by 180°, and the fourth layer LA4 is wound around the outer periphery of the third layer LA3 in the order of winding number 31 to winding number 44 to form the stator winding 1. The layer end portion LE4 of the fourth layer LA4, which is assigned winding number 44, is the winding end portion COE of the stator winding 1. There is one transposition portion 3 of the stator winding 1 for each tooth 13. 19 is an example in which the transposition portion 3 is disposed closer to the core back 12 than the end faces of the stator winding 1 on the core back 12 side, which are indicated by winding numbers 9, 10, 11, 12, and 30. Note that the transposition portion 3 may also be disposed closer to the core back 12 than the end faces of the stator winding 1 on the core back 12 side, which are indicated by winding numbers 31 and 32.

[0048] The stator winding 1 shown in FIG. 19 is an example in which the transposition portion 3 is disposed between the layer end portion LE3 of the third layer LA3 and the layer start portion LS4 of the fourth layer LA4. In FIG. 19, the A layer, the B layer, the A layer end portion AE, and the B layer start portion BS are the third layer LA3, the fourth layer LA4, the layer end portion LE3, and the layer start portion LS4, respectively. The transposition portion 3 is between the winding number 30 and the winding number 31, and between the third layer LA3 and the fourth layer LA4. The second layer LA2 and the third layer LA3 correspond to the central layer portion 4, which is the layer in the center. That is, the stator winding 1 of the third embodiment is transposed 180° between the layers on the outer side of the central layer portion 4. The stator winding 1 shown in FIG. 19 corresponds to the sample S6 shown in FIG. 13 and FIG. 18. In the case of a stator winding 1 in which the number of turns differs for each layer as shown in FIG. 19, by performing a 180° transposition between two layers in which the number of turns on the outer side is smaller than that on the inner side, the loss reduction effect is increased as in sample S6 compared to sample S5 shown in FIG. 13.

[0049] Although the stator winding 1 of the third embodiment has a larger number of turns in the outermost layer than the other layers, the number of layers of the stator winding 1 is an even number equal to or greater than four, and other configurations are similar to those of the stator winding 1 of the second embodiment, so that the stator winding 1 of the third embodiment provides the same effects as the stator winding 1 of the second embodiment. Also, the rotating electric machine 50 of the third embodiment includes the stator winding 1 of the third embodiment, so that the rotating electric machine 50 of the second embodiment provides the same effects as the rotating electric machine 50 of the second embodiment.

[0050] Embodiment 4 20 is a schematic configuration diagram showing a stator winding of a rotating electric machine according to embodiment 4. A rotating electric machine 50 according to embodiment 4 differs from rotating electric machines 50 according to embodiments 2 and 3 in that the number of layers of a stator winding 1 is an even number equal to or greater than four, and a transposition portion 3 is provided between two layers of a central layer portion 4. The following mainly describes the parts that differ from rotating electric machines 50 according to embodiments 2 and 3.

[0051] As shown in Fig. 2, the stator winding 1 includes a plurality of flat wires 2, which are wound in a concentrated manner around the teeth 13 of the stator 10 by flatwise bending. The stator winding 1 is wound in a concentrated manner around the teeth 13 of the stator 10, and a first layer LA1 is formed by winding from a winding start portion COS in the order of winding number 1 to winding number 10. In Fig. 20, winding numbers 1 to 10 are given on a cross section of the stator winding 1. Winding numbers 11 to 38 are also given on a cross section of the stator winding 1. The second layer LA2 is also wound around the outer periphery of the first layer LA1 from winding number 11 to winding number 20 without being transposed. Between the layer end LE2 of the second layer LA2 with the winding number 20 and the layer start LS3 of the third layer LA3 with the winding number 21, the arrangement of the flat wires 2 of the stator winding 1 is transposed by 180° by the transposition portion 3. The third layer LA3 of the stator winding 1 is wound around the outer periphery of the second layer LA2 in the order of winding number 21 to winding number 30 with the arrangement of the flat wires 2 transposed by 180°. The fourth layer LA4 is also wound around the outer periphery of the third layer LA3 with the winding numbers 31 to 38 maintained in the transposition to form the stator winding 1. The layer end LE4 of the fourth layer LA4 with the winding number 38 is the winding end portion COE of the stator winding 1. The transposition portion 3 of the stator winding 1 is one for each tooth 13. The stator winding 1 of embodiment 4 shown in Figure 20 is an example in which the transposition portion 3 is arranged on the core back 12 side of the end face on the core back 12 side of the stator windings 1 indicated by winding numbers 1, 2, 19, 20, 21, 22, 37, and 38.

[0052] The stator winding 1 shown in FIG. 20 is an example in which the transposition portion 3 is disposed between two layers in the central layer portion 4, that is, between the layer end portion LE2 of the second layer LA2 and the layer start portion LS3 of the third layer LA3. In FIG. 20, the A layer, the B layer, the A layer end portion AE, and the B layer start portion BS are the second layer LA2, the third layer LA3, the layer end portion LE2, and the layer start portion LS3, respectively. The transposition portion 3 is between the winding number 20 and the winding number 21, and between the second layer LA2 and the third layer LA3. The second layer LA2 and the third layer LA3 correspond to the central layer portion 4, which is a layer in the center. That is, in the stator winding 1 of the fourth embodiment, the transposition portion 3 is provided between the A layer end portion AE of the A layer and the B layer start portion BS of the B layer in the central layer portion 4. The stator winding 1 shown in FIG. 20 corresponds to the sample S3 shown in FIG. 13 and FIG. 15. When the number of layers of the stator winding 1 is an even number equal to or greater than four, as shown in FIG. 20, by performing a 180° transposition between the two layers of the central layer 4, the loss reduction effect is increased as in sample S3 compared to samples S5 and S6 shown in FIG.

[0053] As shown in FIG. 20, even if the number of layers of the stator winding 1 is 4, which is an even number greater than 3, and the number of turns of the outermost layer is less than the others, the same results as those of sample S3 shown in FIG. 13 and FIG. 15 can be obtained by transposition between two layers in the central layer 4. That is, when the number of layers of the stator winding 1 is an even number greater than 4, if the transposition part 3 is provided between the A-layer end part AE of the A-layer and the B-layer start part BS of the B-layer in the central layer 4, the loss can be reduced more than that of samples S5 and S6, and the same loss reduction effect as that of sample S2 in which transposition is performed between each layer can be obtained. Note that, as shown in FIG. 1, when the number of layers of the stator winding 1 is configured as 2, which is an even number, both the first layer LA1 and the second layer LA2 can also be called the central layer 4. Since the transposition part 3 is provided between the first layer LA1 and the second layer LA2 in the stator winding 1 shown in FIG. 1, the transposition part 3 is provided between the A-layer end part AE of the A-layer and the B-layer start part BS of the B-layer in the central layer 4. Therefore, the stator winding 1 shown in FIG. 1 provides results similar to those of the sample S3 shown in FIGS.

[0054] The stator winding 1 of embodiment 4 has a plurality of flat wires 2 wound in a concentrated manner around the teeth 13 of the stator 10 by flatwise bending, and has a transposition portion 3 between a layer-A end portion AE of layer-A, which is one layer, and a layer-B start portion BS of layer-B, which is the next layer, so that it has the same effect as the stator winding 1 of embodiments 1 to 3. Also, the stator winding 1 of embodiment 4 has a transposition portion 3 between a layer-A end portion AE of layer-A and a layer-B start portion BS of layer-B in a central layer portion 4 having two layers, so that it can reduce losses more than samples S5 and S6 and can achieve the same loss reduction effect as sample S2 in which transposition is performed between each layer.

[0055] Since the rotating electric machine 50 of the fourth embodiment includes the stator winding 1 of the fourth embodiment, similarly to the rotating electric machines 50 of the first to third embodiments, the workability of the stator winding 1 is improved compared to the conventional art, and the winding space factor of the stator winding 1 is improved. Furthermore, due to the effect of the stator winding 1 of the fourth embodiment, the rotating electric machine 50 of the fourth embodiment can reduce losses more than the samples S5 and S6, and can obtain the same loss reduction effect as the sample S2 in which transposition is performed between each layer.

[0056] 1, 8, 19, and 20, the transposition part 3 is provided on the core back 12 side of the stator 10, but the transposition part 3 may be provided on the gap 21 side. However, when the transposition part 3 is provided on the gap 21 side, it is necessary to move the transposition part 3 to the gap 21 side to prevent contact between the transposition part 3 and the rotor 20, which reduces workability compared to when the transposition part 3 is provided on the core back 12 side. For this reason, it is desirable to set the winding start position, i.e., the winding start part COS, so that the transposition part 3 is located on the core back 12 side.

[0057] Embodiment 5. FIG. 21 is a diagram showing a configuration of a rotating electric machine according to a fifth embodiment, and FIG. 22 is a diagram showing a phase ring conductor of FIG. 21. A rotating electric machine 50 according to the fifth embodiment will be described as an example of a rotating electric machine to which a plurality of phases of electric power are applied. The rotating electric machine 50 according to the fifth embodiment shown in FIG. 21 is, for example, a three-phase rotating electric machine, and is an example having four U-phase stator windings, four V-phase stator windings, and four W-phase stator windings. The first to fourth U-phase stator windings are denoted by 1Ua, 1Ub, 1Uc, and 1Ud. Similarly, the first to fourth V-phase stator windings are denoted by 1Va, 1Vb, 1Vc, and 1Vd, and the first to fourth W-phase stator windings are denoted by 1Wa, 1Wb, 1Wc, and 1Wd. Where appropriate, the reference numeral 1 will be used collectively for the stator windings, and 1Ua to 1Ud, 1Va to 1Vd, and 1Wa to 1Wd will be used to distinguish between them. A rotating electric machine 50 according to the fifth embodiment shown in Fig. 21 includes a rotor 20 having a rotor core 26 on the surface of which a plurality of permanent magnets 27 are provided, and a stator 10 arranged on the outside of the rotor 20 with a gap 21 between them. The stator 10 includes a stator core 11 having a plurality of teeth 13 arranged on the outside of the rotor 20 with a gap 21 between them, and a stator winding 1 wound around each of the teeth 13.

[0058] The direction of rotation axis 25 of rotor 20 is axial direction Z, the direction from rotation axis 25 to the outside is radial direction R, and the direction of rotation around rotation axis 25 is circumferential direction Φ. Core back 12 of stator core 11 supports twelve teeth 13.

[0059] Generally, in rotating electrical machines, the stator winding 1 of the same phase is often wound around multiple teeth 13 of a stator 10. In this case, the stator winding 1 wound around one tooth 13 must be routed to other teeth 13, which deteriorates workability. In particular, the stator winding 1 made of multiple rectangular wires 2 is relatively large in size, which requires space to route the stator winding 1, which deteriorates workability.

[0060] Therefore, as shown in FIG. 22, each time the stator winding 1 is wound around one tooth 13, a connecting conductor 31 is connected to each end of the stator winding 1, i.e., the winding start portion COS and the winding end portion COE, and finally, the connecting conductors 31 in the stator windings 1 of the same phase are connected to the ring conductor 32, thereby preventing deterioration of workability due to the routing of the stator winding 1. In FIG. 22, the first U-phase stator winding 1Ua and the second U-phase stator winding 1Ub are shown by dashed lines. One end of the stator winding 1Ua is connected to a terminal 35 via the connecting conductor 31. The other end of the stator winding 1Ua is connected to one end of the second U-phase stator winding 1Ub via the connecting conductor 31, the ring conductor 32, and the connecting conductor 31. The connecting conductor 31 and the ring conductor 32 form a phase ring conductor 30. The connection conductor 31 and the ring conductor 32 are connected after all of the stator windings 1 have been wound.

[0061] 21 only shows the U-phase phase ring conductor 30, and omits the V-phase and W-phase phase ring conductors 30. The other end of the second U-phase stator winding 1Ub is connected to one end of the third U-phase stator winding 1Uc by a second ring conductor 32. The other end of the third U-phase stator winding 1Uc is connected to one end of the fourth U-phase stator winding 1Ud by a third ring conductor 32. Note that one ends of the fourth stator windings 1Ud, 1Vd, 1Wd are connected to the ring conductor 32 for forming a neutral point, but the ring conductor 32 and connecting conductor 31 for forming the neutral point are omitted.

[0062] Since the connecting conductors 31 and ring conductors 32 constituting the phase ring conductor 30 are configured as bus bars, even if the flat wires 2 of the stator winding 1 are divided at the teeth 13 of the stator 10, they are collectively connected by the connecting conductors 31. For this reason, if each stator winding 1 does not have the transposition portion 3 shown in the first to fourth embodiments, a large circulating current loss occurs.

[0063] However, by applying each stator winding 1 having the transposition portion 3 shown in the first to fourth embodiments to the stator winding of a rotating electric machine through which multiple phases of power pass, the circulating current loss is reduced, and it becomes possible to connect the stator windings 1 collectively at their ends by the connecting conductors 31. By connecting the stator windings 1 of the same phase using the phase ring conductors 30, it is possible to prevent the deterioration of workability caused by the routing of the stator windings 1 described above.

[0064] Since the rotating electric machine 50 of the fifth embodiment includes the stator winding 1 of the first to fourth embodiments, the rotating electric machine 50 of the fifth embodiment achieves the same effects as the rotating electric machines 50 of the first to fourth embodiments.

[0065] As described above, the rotating electric machine 50 of the fifth embodiment is a rotating electric machine including the stator 10 and the rotor 20, and receiving electric power of multiple phases. The rotor 20 includes a rotor core 26 having a plurality of permanent magnets 27 on its surface. The stator 10 includes a stator core 11 having a plurality of teeth 13 arranged on the outside of the rotor 20 with gaps 21 between them, and a stator winding 1 wound around each of the teeth 13. The rotating electric machine 50 further includes a ring conductor 32 that connects the plurality of stator windings 1 receiving electric power of the same phase through a connecting conductor 31. The stator winding 1 is wound around the stator 10 of the rotating electric machine 50 in a plurality of layers, and includes a plurality of rectangular wires 2, which are wound in a concentrated manner around the teeth 13 of the stator 10 by a flatwise bending method. The stator winding 1 has a transposition portion 3 that transposes the arrangement of the plurality of rectangular wires 2 by 180° between a layer end portion (layer A end portion AE) where winding of layer A, which is one layer closer to the teeth 13 than the outermost circumference, has ended, and a layer start portion (layer B start portion BS) of layer B, which is the next layer to be wound around layer A. With this configuration, the rotating electric machine 50 of embodiment 5 has a plurality of rectangular wires 2 wound in a concentrated manner around the teeth 13 of the stator 10 by the flatwise bending method, and has a transposition portion 3 between the layer end portion of one layer (layer A end portion AE of layer A) and the layer start portion of the next layer (layer B start portion BS of layer B). This improves the workability of the stator winding 1 compared to conventional methods, and improves the winding space factor of the stator winding 1.

[0066] In addition, although various exemplary embodiments and examples are described in this disclosure, various features, aspects, and functions described in one or more embodiments are not limited to application of a specific embodiment, but can be applied to the embodiments alone or in various combinations. Therefore, countless modifications not exemplified are expected within the scope of the technology disclosed in this specification. For example, this includes cases in which at least one component is modified, added, or omitted, and further cases in which at least one component is extracted and combined with components of other embodiments. [Explanation of symbols]

[0067] 1, 1a... stator winding, 1Ua, 1Ub, 1Uc, 1Ud... stator winding, 1Va, 1Vb, 1Vc, 1Vd... stator winding, 1Wa, 1Wb, 1Wc, 1Wd... stator winding, 2... flat wire, 3... transposition portion, 4... central layer portion, 10... stator, 11... stator core, 12... core back, 13... teeth, 20... rotor, 21... gap, 26... rotor core, 27... permanent magnet, 32... ring conductor, 31... connecting conductor, 50... rotating machine, AE... A layer end portion, BS... B layer start portion, COS... winding start portion, COE... winding end portion, LA1... first layer, LA2... second layer, LA3... third layer, LA4... fourth layer, LA5... fifth layer, LS1, LS2, LS3, LS4... layer start portion, LE1, LE2, LE3, LE4... layer end portion

Claims

1. A stator winding of a rotating electric machine wound in a plurality of layers on a stator of the rotating electric machine, The stator winding is It has multiple rectangular wires, A plurality of the flat wires are wound around the teeth of the stator by a flatwise bending method, Each of the layers of the stator winding is formed by winding a plurality of the rectangular wires around the teeth in a radial direction of the rotating electric machine, A transition portion is provided between a layer end portion of layer A, which is one of the layers closer to the teeth than the outermost layer, and a layer start portion of layer B, which is the next layer to be wound around the outer periphery of layer A, for transitioning the arrangement of the plurality of flat wires by 180°. Stator winding of a rotating electric machine.

2. When the number of layers of the stator winding is three or more, The dislocation portion is a layer end portion of the A layer and a layer start portion of the B layer on an outer side including a central layer portion which is a central portion of the plurality of layers of the stator winding, 2. A stator winding for a rotating electric machine according to claim 1.

3. When the number of layers of the stator winding is an even number equal to or greater than four, The dislocation portion is a central layer portion, which is a central portion of the plurality of layers of the stator winding, between the layer end portion of the A layer and the layer start portion of the B layer; 2. A stator winding for a rotating electric machine according to claim 1.

4. the stator of the rotating electric machine includes a core back that supports the teeth, The dislocation portion is On the core back side, the layer is provided between the layer end portion of the A layer and the layer start portion of the B layer. The stator winding for a rotating electric machine according to any one of claims 1 to 3.

5. The transition portion is one for each of the teeth. The stator winding for a rotating electric machine according to any one of claims 1 to 3.

6. The transition portion is one for each of the teeth.

5. A stator winding for a rotating electric machine according to claim 4.

7. The stator winding is At a winding start portion, which is a start portion of the first layer wound around the tooth, and at a winding end portion, which is an end portion of the last layer wound around the tooth, A connection conductor is provided to which all of the flat wires are connected. The stator winding for a rotating electric machine according to any one of claims 1 to 3.

8. The stator winding is At a winding start portion, which is a start portion of the first layer wound around the tooth, and at a winding end portion, which is an end portion of the last layer wound around the tooth, A connection conductor is provided to which all of the flat wires are connected.

5. A stator winding for a rotating electric machine according to claim 4.

9. The stator winding is At a winding start portion, which is a start portion of the first layer wound around the tooth, and at a winding end portion, which is an end portion of the last layer wound around the tooth, A connection conductor is provided to which all of the flat wires are connected.

6. A stator winding for a rotating electric machine according to claim 5.

10. A rotating electric machine including a stator and a rotor, The rotor has a plurality of permanent magnets provided on the surface or inside of the rotor core, The stator includes: a stator core having a plurality of teeth arranged on the outside of the rotor with gaps therebetween; The stator winding of the rotating electric machine according to any one of claims 1 to 3, which is wound for each of the teeth; Equipped with Rotating electric motor.

11. A rotating electric machine including a stator and a rotor, The rotor has a plurality of permanent magnets provided on the surface or inside of the rotor core, The stator includes: a stator core having a plurality of teeth arranged on the outside of the rotor with gaps therebetween; 5. The stator winding of claim 4, wherein the stator winding is wound on each of the teeth. Equipped with Rotating electric motor.

12. A rotating electric machine including a stator and a rotor, The rotor has a plurality of permanent magnets provided on the surface or inside of the rotor core, The stator includes: a stator core having a plurality of teeth arranged on the outside of the rotor with gaps therebetween; 6. A stator winding for a rotating electric machine according to claim 5, wherein the stator winding is wound for each of the teeth; Equipped with Rotating electric motor.

13. A rotating electric machine including a stator and a rotor, The rotor has a plurality of permanent magnets provided on the surface or inside of the rotor core, The stator includes: a stator core having a plurality of teeth arranged on the outside of the rotor with gaps therebetween; 8. The stator winding of the rotating electric machine according to claim 7, wherein the stator winding is wound on each of the teeth; Equipped with Rotating electric motor.

14. A rotating electric machine including a stator and a rotor, and through which a multi-phase electric power is passed, The rotor has a plurality of permanent magnets provided on the surface or inside of the rotor core, The stator includes: a stator core having a plurality of teeth arranged on the outside of the rotor with gaps therebetween; 8. The stator winding of the rotating electric machine according to claim 7, wherein the stator winding is wound on each of the teeth; Equipped with The rotor further includes a ring conductor that connects the plurality of stator windings, to which electric power of the same phase is applied, via the connection conductor. Rotating electric motor.

Images