Stator of a rotating electric machine

Abstract

A rotary electric machine stator comprising a cylindrical core that has a plurality of slots, coils that are disposed parallel to the slots and constitute 2n sets of Y connections (n is an integer of at least 1) formed from phase winding groups connected at the ends thereof and having different electrical phases, and connection parts that connect the coils, wherein: the connection parts comprise a first conductive plate, a second conductive plate, and a third conductive plate for connecting the ends of coils of the same phase, and a neutral point connection plate for connecting neutral points in phase winding groups; the neutral point connection plate connects a coil disposed on an inside layer in the core radial direction and a coil disposed on an outside layer in the coil radial direction; the neutral point connection plate is divided into a plurality of pieces in the core circumferential direction; and the connection parts are disposed to positions where at least one among the first conductive plate, the second conductive plate, and the third conductive plate and at least one among the pieces of the divided neutral point connection plate overlap in the core axial direction.

Description

Technical Field

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[0001] The present invention relates to a stator of a rotating electrical machine.

Background Art

[0002] Rotating electrical machines are widely used, and when mounted on a moving body such as an automobile, miniaturization is required. Patent Document 1 discloses a rotating electrical machine including a stator core, a stator winding composed of a plurality of segment coils, a phase-to-phase connection conductor connecting different phases of the segment coils of the stator winding, and a connection board for fixing a phase-to-phase connection conductor connecting segment coils of the same phase of the stator winding. The stator winding has a coil connection portion on one side with respect to the axial direction of the stator core, where ends of the plurality of segment coils are connected to each other, and the connection board is arranged on the side where the coil connection portion is arranged with respect to the stator core.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the invention described in Patent Document 1, there is room for improvement in miniaturization of the rotating electrical machine.

Means for Solving the Problems

[0005] <00A stator for a rotating electric machine according to a first aspect of the present invention comprises a cylindrical core having a plurality of slots, coils arranged in the slots, the ends of which are connected to form 2n sets of Y connections (n ​​is an integer of 1 or more) consisting of phase windings with different electrical phases, and a connection section for connecting the coils, wherein the connection section comprises a first conductive plate material, a second conductive plate material, and a third conductive plate material for connecting the ends of the coils of the same phase, and a neutral point connecting plate material for connecting the neutral points of the phase windings, wherein the neutral point connecting plate material connects a coil arranged in the radially inner layer of the core and a coil arranged in the radially outer layer of the core, the neutral point connecting plate material is divided into a plurality in the circumferential direction of the core, and the connection section is arranged such that at least one of the first conductive plate material, the second conductive plate material, and the third conductive plate material and at least one of the divided neutral point connecting plate material are positioned to overlap in the axial direction of the core. Each of the divided neutral point connecting plate material is positioned at a different location in the axial direction of the core. . [Effects of the Invention]

[0006] According to the present invention, the stator can be miniaturized. [Brief explanation of the drawing]

[0007] [Figure 1] External view of the stator [Figure 2] Connection diagram of the first and second neutral wires [Figure 3] Enlarged view of the wiring section [Figure 4] Figure 3, section IV-IV [Figure 5] Exploded view of the wiring section [Figure 6] Schematic diagram showing the positional relationship of the connection points. [Figure 7] Enlarged view showing the connection point between the single-phase coil and the wiring section. [Figure 8] Diagram showing variations in the wiring configuration. [Modes for carrying out the invention]

[0008] —Embodiment— The following describes an embodiment of the stator of a rotating electric machine with reference to Figures 1 to 7.

[0009] Figure 1 is an external view of the stator 100. The stator 100 comprises a cylindrical core 1 having slots 2, a winding coil 20 inserted into the slots 2, and a connection section 30 connecting the winding coil 20 to the outside. In this embodiment, the axial direction X, radial direction R, and circumferential direction C are defined. The axial direction X is a straight line parallel to the axis of the cylindrical core 1. The radial direction R is a straight line perpendicular to the axis of the core 1 and passing through the axis of the core 1. The circumferential direction C is the direction along the outer circumference of the core 1.

[0010] The winding coil 20 is composed of a group of phase windings with different electrical phases. Specifically, the winding coil 20 includes a U-phase coil 21, a V-phase coil 22, and a W-phase coil 23. In this embodiment, the winding coil 20 comprises four sets of Y-connected coils. Hereinafter, the U-phase coil 21, V-phase coil 22, and W-phase coil 23 will each be collectively referred to as a "single-phase coil" 20A. That is, in this embodiment, the winding coil 20 consists of 12 single-phase coils 20A, since there are 3 phases x 4 sets. A single-phase coil 20A can also be said to be one of the phase windings that make up the group of phase windings. At the axial X end of the winding coil 20, a protrusion 20S is periodically formed along the circumferential direction C, protruding from the core 1 along the axial direction X.

[0011] The connection section 30 serves to connect the single-phase coils 20A within the stator 100 and to connect to the outside of the stator 100. The connection section 30 includes a U-phase busbar 31, a V-phase busbar 32, a W-phase busbar 33, a first neutral wire 34, and a second neutral wire 35. The U-phase busbar 31 connects the U-phase coils 21 and has an external connection terminal. The V-phase busbar 32 connects the V-phase coils 22 and has an external connection terminal. The W-phase busbar 33 connects the W-phase coils 23 and has an external connection terminal. The first neutral wire 34 and the second neutral wire 35 only provide connections between the single-phase coils 20A within the stator 100 and do not have external connection terminals for the stator 100.

[0012] The U-phase busbar 31, V-phase busbar 32, and W-phase busbar 33 are each connected to four single-phase coils 20A. The first neutral wire 34 and the second neutral wire 35 are each connected to six single-phase coils 20A. The U-phase busbar 31, V-phase busbar 32, W-phase busbar 33, the first neutral wire 34, and the second neutral wire 35 are each plate-shaped members formed by sheet metal processing of a plate material.

[0013] Figure 2 is a connection diagram of the first neutral wire 34 and the second neutral wire 35. It is also possible to provide four neutral points connecting each layer of UVW, but in this embodiment, in order to reduce the number of parts, neutral wires are provided that connect each layer of UVW in pairs. In this case, it is conceivable to configure neutral wires that simply connect two pairs of neutral points, as shown as State 1 at the top of Figure 2. Furthermore, since it is possible to connect with other pairs depending on the characteristics of the neutral points, the configuration may be rearranged as shown in State 2. State 3 is a reorganized version of the description in State 2. In this embodiment, the wiring in State 3 is adopted.

[0014] Figure 3 is an enlarged view of the connection section 30. The area indicated by reference numeral 39 at the top of Figure 3 is the region connected to the outside of the stator 100. The connection section 30 is divided into three layers in the axial direction X. The first layer in the upper part of the figure contains the U-phase busbar 31 and the second neutral wire 35. The second layer in the middle part of the figure contains the V-phase busbar 32 and the first neutral wire 34. The third layer in the lower part of the figure contains the W-phase busbar 33.

[0015] Figure 4 is a cross-sectional view taken along line IV-IV of Figure 3. As mentioned above, the connection section 30 is shown to have a three-layer structure in the axial direction X. The U-phase busbar 31, V-phase busbar 32, W-phase busbar 33, first neutral wire 34, and second neutral wire 35 each have different specific shapes but share a common abstract configuration, which will be described below. That is, each of the U-phase busbar 31, V-phase busbar 32, W-phase busbar 33, first neutral wire 34, and second neutral wire 35 has a connection base 41, a connection section 42, and a coil coupling section 43.

[0016] The connection base 41 is a portion extending in the circumferential direction C, and the U-phase bus bar 31, V-phase bus bar 32, and W-phase bus bar 33 further include connection locations with the outside of the stator 100. The connection portion 42 is a portion extending in the radial direction R and connects the connection base 41 and the coil coupling portion 43. The coil coupling portion 43 is a portion extending in the axial direction X and is connected to the end of the single-phase coil 20A. The coil coupling portion 43 in the present embodiment has a tip that branches into two and has the shape of the letter "U". Hereinafter, the tip of the branched coil coupling portion 43 is referred to as the coil coupling terminal 431. A single-phase coil 20A is connected to each coil coupling terminal 431.

[0017] FIG. 5 is an exploded view of the connection portion 30. Strictly speaking, FIG. 5 shows each of the U-phase bus bar 31, V-phase bus bar 32, W-phase bus bar 33, first neutral line 34, and second neutral line 35 separately, and shows the connection portion 30 with FIG. 3 reduced in size at the lower left for confirmation. FIG. 3 shows each component of the connection portion 30 that was overlapping and not clear in shape.

[0018] FIG. 6 is a schematic view showing the positional relationship of the connection portion 30. However, in FIG. 6, the connection locations with the outside of the stator 100 are ignored. The connection portion 30 is divided into three layers in the axial direction X. In the first layer at the upper stage shown in the figure, the U-phase bus bar 31 and the second neutral line 35 belong. In the second layer at the middle stage shown in the figure, the V-phase bus bar 32 and the first neutral line 34 belong. In the third layer at the lower stage shown in the figure, the W-phase bus bar 33 belongs. The U-phase bus bar 31, the first neutral line 34, and the W-phase bus bar 33 have an overlap in the axial direction X. The second neutral line 35, the V-phase bus bar 32, and the W-phase bus bar 33 have an overlap in the axial direction X. The first neutral line 34 and the second neutral line 35 are arranged at different positions in the axial direction X. By arranging them at different positions in the axial direction X, the spread of the connection portion 30 in the circumferential direction C is suppressed.

[0019] FIG. 7 is an enlarged view showing the connection site between the single-phase coil 20A and the connection part 30. However, FIG. 7 shows the state before the single-phase coil 20A and the connection part 30 are connected. On the right side of FIG. 7, only the winding coil 20 and the connection part 42 are shown with a slightly changed viewing point. The left side of FIG. 7 is a perspective view, and both the axial direction X and the radial direction R are shown in the vertical direction of the figure. On the right side of FIG. 7, the axial direction X is shown in the vertical direction of the figure, and the radial direction R is shown as the direction penetrating the paper surface.

[0020] As shown in FIG. 7, the connection part 42 of the connection part 30 is arranged between adjacent protruding parts 20S. Since the cross-sectional area of the coil end 20E is the same as that of the coil coupling terminal 431, the coil end 20E and the coil coupling terminal 431 can be efficiently welded. The cross-sectional area of the coil coupling terminal 431 is smaller than the cross-sectional area of the connection part 42. Also, since each of the adjacent coil coupling terminals 431 is coupled to each of the single-phase coils 20A arranged in the adjacent slots 2, the routing is reduced and efficient welding can be performed.

[0021] According to the above-described embodiment, the following operational effects can be obtained. (1) The stator 100 comprises a cylindrical core 1 having a plurality of slots 2, winding coils 20 arranged in the slots 2, the ends of which are connected to form four sets of Y connections consisting of phase winding groups with different electrical phases, and a connection section 30 for connecting single-phase coils 20A. The connection section 30 comprises a U-phase busbar 31, a V-phase busbar 32, and a W-phase busbar 33, and a first neutral wire 34 and a second neutral wire 35 that connect the neutral points of the phase winding groups. The first neutral wire 34 and the second neutral wire 35 connect the single-phase coils 20A arranged in the inner layer of the core 1 in the radial direction R to the single-phase coils 20A arranged in the inner layer of the core 1 in the radial direction R. The first neutral wire 34 and the second neutral wire 35 are divided into a plurality in the circumferential direction C of the core 1. The connection section 30 is positioned such that at least one of the U-phase busbar 31, V-phase busbar 32, and W-phase busbar 33, and at least one of the first neutral wire 34 and second neutral wire 35, overlap with the axial X of the core 1. As a result, the connection section 30 can be miniaturized, and therefore the stator 100 equipped with this connection section 30 can be miniaturized.

[0022] (2) The first neutral wire 34 and the second neutral wire 35 are each positioned at different locations in the axial direction X of the core 1. Therefore, the area in the circumferential direction C occupied by the first neutral wire 34 and the second neutral wire 35 can be reduced, the connection section 30 can be made smaller, and the stator 100 having the connection section 30 can be made smaller.

[0023] (3) The connection section 30 is arranged such that two of the U-phase busbars 31, V-phase busbars 32, and W-phase busbars 33, and one of the first neutral wire 34 and second neutral wire 35, overlap with the axial X of the core 1. As a result, the connection section 30 can be made smaller, and the stator 100 having the connection section 30 can be made smaller.

[0024] (4) The first neutral wire 34 and the second neutral wire 35 each have a connection base 41 along the circumferential direction C of the core 1, a connection portion 42 protruding from the connection base 41 in the radial direction R of the core 1, and a coil coupling terminal 431 provided at the end of the connection portion 42 and coupled to the coil end 20E, which is the end of the winding. The winding coil 20 has a protruding portion 20S protruding from the core 1 along the axial direction X, and the connection portion 42 is provided between the protruding portions 20S. As a result, the height in the axial direction X of the connection portion 30 is suppressed, so the connection portion 30 can be made smaller, and the stator 100 having the connection portion 30 can be made smaller.

[0025] (5) One connection part 42 has multiple coil coupling terminals 431. One coil coupling part 43 is coupled to one single-phase coil 20A. Since the coil coupling part 43 and the coil end 20E of the single-phase coil 20A correspond in a 1:1 ratio, welding can be performed efficiently.

[0026] (6) The cross-sectional area of ​​the coil coupling terminal 431 is smaller than the cross-sectional area of ​​the connection part 42 and is the same as the cross-sectional area of ​​the coil end 20E. Therefore, by making the cross-sectional areas the same, the heat draw is the same in the case of TIG welding, and the melting process is stabilized.

[0027] (7) Each of the adjacent coil coupling terminals 431 is coupled to each of the single-phase coils 20A located in the adjacent slot 2. This reduces the amount of wiring required and allows for efficient welding.

[0028] (8) The U-phase busbar 31, V-phase busbar 32, W-phase busbar 33, first neutral wire 34, and second neutral wire 35 are pre-processed plate materials. Therefore, assembly is easy and manufacturing costs can be reduced.

[0029] (Variation 1) The connection section 30 can take on various configurations. The positions of the busbars corresponding to each layer of UVW may be swapped, or their positions may be swapped with the respective neutral wires. Furthermore, the positions of the busbars that extend widely in the circumferential direction C may be changed. However, a configuration in which the neutral wire extends widely in the circumferential direction C cannot be adopted. A detailed explanation will be given with reference to the figure.

[0030] Figure 8 shows variations of the connection section 30. The connection section 30 can take any configuration other than 30-NG among the configurations shown in Figure 8. Reference numeral 30 in the upper left indicates the configuration in the embodiment and shows the same information as in Figure 6. Reference numeral 30-1 in the upper right indicates that the busbars of each layer of UVW have been swapped from the configuration of the connection section 30.

[0031] The symbol 30-2 in the middle left swaps the second and third stages of the connection section 30. The symbol 30-3 in the middle right randomly swaps the configuration of the first and second stages of the connection section 30. The symbol 30-4 in the bottom left positions the second neutral wire 35 and the V-phase busbar 32 so that they do not overlap with the W-phase busbar 33 in the axial direction X. The symbol 30-NG in the bottom right swaps the second neutral wire 35 and the W-phase busbar 33 of the connection section 30, resulting in an inappropriate configuration as it cannot achieve state 3 in Figure 2.

[0032] (Modification 2) In the embodiment described above, the winding coil 20 is equipped with four Y-connected coils. However, the number of Y-connected coils equipped with the winding coil 20 can be an even number, such as 2, 4, 6, or 8. If we define "n" as an integer of 1 or more, then the winding coil 20 can be equipped with "2n" Y-connected coils. In this case, the number of coil coupling terminals 431 equipped with each coil coupling section 43 is "n". For example, if the winding coil 20 is equipped with "6" Y-connected coils, the number of coil coupling terminals 431 equipped with each coil coupling section 43 is "3".

[0033] The embodiments and modifications described above may be combined in any way. Although various embodiments and modifications have been described above, the present invention is not limited to these. Other embodiments that can be conceivable within the scope of the technical idea of ​​the present invention are also included within the scope of the present invention. [Explanation of symbols]

[0034] 1: Core 2: Slot 20: Wound coil 20A: Single-phase coil 20E: Coil end 20S:Protrusion 30: Connection section 31: U-phase bus bar 32: V-phase busbar 33: W-phase busbar 34: First neutral wire 35: Second neutral wire 41: Connection base 42: Connection part 43: Coil connection part 100: Stator 431: Coil coupling terminal C: Circumferential direction R: Radial direction X: Axial direction

Claims

1. A cylindrical core having multiple slots, A coil arranged in a slot, the ends of which are connected to form 2n sets of Y-connections (where n is an integer of 1 or more) consisting of phase windings with different electrical phases, It comprises a connection section for connecting the aforementioned coil, The connection section comprises a first conductive plate material, a second conductive plate material, and a third conductive plate material that connect the ends of the coils of the same phase, and a neutral point connecting plate material that connects the neutral points of the phase winding group. The neutral point connecting plate connects the coil arranged in the radially inner layer of the core and the coil arranged in the radially outer layer of the core. The neutral point connecting plate material is divided into multiple parts in the circumferential direction of the core, The connection portion is arranged such that at least one of the first conductive plate material, the second conductive plate material, and the third conductive plate material, and at least one of the divided neutral point connection plate material, overlap in the axial direction of the core. A stator for a rotating electric machine, wherein each of the divided neutral point connecting plate members is positioned at a different location in the axial direction of the core.

2. A stator for a rotating electric machine according to claim 1, The connection section is a stator for a rotating electric machine, in which two of the first conductive plate material, the second conductive plate material, and the third conductive plate material and one of the divided neutral point connection plate material are arranged to overlap in the axial direction of the core.

3. A stator for a rotating electric machine according to claim 1, The aforementioned neutral point connecting plate material is The core has a connecting base along the circumferential direction, A connecting portion that protrudes radially from the connecting base of the core, This is a portion provided at the end of the connection portion, and has a coil coupling portion that is connected to the coil end, which is the end of the coil. The coil has a projection that protrudes from the core along the axial direction, The aforementioned connecting portion is a stator of a rotating electric machine, provided between the aforementioned protruding portions.

4. A stator for a rotating electric machine according to claim 3, Each coil coupling portion has at least one coil coupling terminal which is coupled to one single-phase coil constituting the group of phase windings. A stator for a rotating electric machine, wherein the number of coil coupling terminals provided in one of the coil coupling portions is the same as the number n.

5. A stator for a rotating electric machine according to claim 4, A stator for a rotating electric machine, wherein the cross-sectional area of ​​the coil coupling terminal is smaller than the cross-sectional area of ​​the connection portion and is the same as the cross-sectional area of ​​the coil end.

6. A stator for a rotating electric machine according to claim 4, A stator for a rotating electric machine, wherein each of the adjacent coil coupling portions is coupled to each of the single-phase coils arranged in the adjacent slots.

7. A stator for a rotating electric machine according to claim 1, The first conductive plate material, the second conductive plate material, the third conductive plate material, and the neutral point connecting plate material are pre-processed plate materials, in the stator of a rotating electric machine.

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