Rotating electrical machine

Abstract

To provide a rotary electric machine in which vibration of a crossover wire having one end connected to a coil end can be suppressed.SOLUTION: A rotary electric machine includes a rotor, and a stator that is disposed so as to cover a radially outer side of the rotor such that a gap is formed between the stator and the rotor, and includes a stator core and a stator coil. The stator coil has, at one side in an axial direction of the rotor, a plurality of coil ends that are arranged at an interval in a circumferential direction of the rotor. The rotary electric machine further has at least one crossover wire having one end connected to one of two coil ends, of the plurality of coil ends, that are adjacent to each other in the circumferential direction, and a spacer including a base end disposed between the two coil ends so as to be in contact with the two coil ends respectively and a tip that is projected from the base end toward one side in the axial direction beyond axial end surfaces of the two coil ends. The tip has at least one contact surface that is in contact with the at least one crossover wire.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present disclosure relates to a rotating electrical machine including a rotor and a stator.

Background Art

[0002] Generally, a rotating electrical machine is composed of a stator and a rotor. The stator includes a stator core and a stator coil. The stator coil is incorporated and fixed in slots provided in the stator core.

[0003] Some stator coils have a plurality of coil ends (coil ends) that protrude from the stator core to one side in the axial direction of the rotor and are arranged at intervals in the circumferential direction of the rotor. In order to support the plurality of coil ends without gaps, it may be performed to sandwich a spacer made of an insulator in the gap formed between the coil ends. Patent Document 1 discloses disposing a coil end support device configured by sandwiching a corrugated spring with the direction of the wave as the circumferential direction of the stator core as a core material between non-woven fabric materials in the gap formed between the coil ends.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, a rotating electrical machine is configured to generate an electromagnetic force by rotating a rotor having an N pole and an S pole inside a stator coil. When an electromagnetic force is generated in the stator coil, electromagnetic vibration occurs. Also, one end of a jumper wire forming an electrical path may be connected to the coil end of the stator coil. However, a portion of the jumper wire that is farther from the stator core in the axial direction of the rotor than the coil end of the jumper wire is not strongly supported by another member (spacer) like the coil end, so there is a risk of generating large electromagnetic vibration.

[0006] In view of the above circumstances, at least one embodiment of the present invention aims to provide a rotating electrical machine capable of suppressing the vibration of a jumper wire having one end connected to a coil end.

Means for Solving the Problems

[0007] A rotating electrical machine according to at least one embodiment of the present invention includes a rotor, and a stator disposed so as to cover the outside in the radial direction of the rotor and having a gap formed therebetween and the stator including a stator core and a stator coil, the stator coil has a plurality of coil ends arranged at intervals in the circumferential direction of the rotor on one side in the axial direction of the rotor, the rotating electrical machine further includes at least one jumper wire having one end connected to one of two coil ends arranged adjacent to each other in the circumferential direction among the plurality of coil ends, and a spacer including a base end portion arranged to abut against each of the two coil ends between the two coil ends, and a tip portion protruding from the base end portion to one side in the axial direction beyond the axial end faces of each of the two coil ends, the tip portion has at least one contact surface that contacts the at least one jumper wire.

Advantages of the Invention

[0008] According to at least one embodiment of the present invention, there is provided a rotating electrical machine capable of suppressing the vibration of an overhang wire having one end connected to a coil end portion.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6A

Figure 6B

Figure 6C

Figure 7A

Figure 7B

Figure 7C

Embodiments for Carrying Out the Invention

[0010] Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples.

[0011] (Rotating electrical machine) FIG. 1 is a schematic perspective view showing a partially cutaway view of a rotating electrical machine 1 according to an embodiment. As shown in FIG. 1, the rotating electrical machine 1 according to some embodiments includes a rotor 2 and a stator 3 disposed so as to cover the outside in the radial direction of the rotor 2 and having a gap formed therebetween. The stator 3 includes a stator core 31 and a stator coil 32. In the following some embodiments, the case where the rotating electrical machine 1 is a motor is described, but the present disclosure is also applicable to the case where the rotating electrical machine 1 is a generator.

[0012] The stator coil 32 has a plurality of coil ends 4 arranged at intervals in the circumferential direction of the rotor 2 on one side in the axial direction of the rotor 2. In the illustrated embodiment, the stator core 31 is formed in an annular shape. The stator coil 32 has a stator coil main body portion 33 attached to the inner peripheral surface of the stator core 31. The stator coil main body portion 33 is disposed so as to cover the outside in the radial direction of the rotor 2 and has a gap formed therebetween.

[0013] In the following description, the direction may be described with reference to the axial direction (the direction in which the axis LA of the rotor 2 extends), the radial direction (the direction orthogonal to the axis LA) of the rotor 2, and the circumferential direction of the rotor 2. The axial direction of the rotor 2 may be simply referred to as the axial direction, the radial direction of the rotor 2 may be simply referred to as the radial direction, and the circumferential direction of the rotor 2 may be simply referred to as the circumferential direction. The side where the plurality of coil ends 4 of the stator coil 32 are provided is defined as the front side (the left side in FIG. 1) in the above axial direction, and the side opposite to the front side in the above axial direction is defined as the rear side.

[0014] Each of the plurality of coil ends 4 extends forward along the axial direction from the front end of the stator coil main body 33. Each of the plurality of coil ends 4 is located on the front side in the axial direction with respect to the stator core 31.

[0015] (Coil end support structure of the rotating electrical machine according to the comparative example) FIG. 2 is a schematic perspective view showing a state in which a plurality of coil ends 4 and a plurality of reference spacers 06 of the rotating electrical machine 01 according to the comparative example are assembled. FIG. 3 is a schematic perspective view showing a state in which a plurality of coil ends 4, a plurality of reference spacers 06, and a plurality of spanning wires 5 of the rotating electrical machine 01 according to the comparative example are assembled. In the rotating electrical machine 01 according to the comparative example, the same reference numerals are given to the portions common to the rotating electrical machine 1, and overlapping descriptions are omitted as appropriate.

[0016] The stator coil 32 of the rotating electrical machine 01 according to the comparative example has a plurality of coil ends 4 arranged at intervals in the circumferential direction of the rotor 2 on one side (front side) in the axial direction of the rotor 2 as shown in FIG. 2. The rotating electrical machine 01 according to the comparative example includes a plurality of reference spacers 06 individually arranged between two coil ends 4A and 4B that are arranged adjacent to each other in the circumferential direction of the rotor 2 among the plurality of coil ends 4. Each of the plurality of reference spacers 06 is arranged so as to contact each of the two coil ends 4A and 4B.

[0017] Each of the plurality of coil ends 4 (4A, 4B) includes an axial end face 41 (41A, 41B) which is the front end face in the axial direction of the coil end 4, an end face (one end face) 42 (42A, 42B) on one side (right side in FIG. 2) in the circumferential direction of the coil end 4, and an end face 43 (43A, 43B) on the other side (opposite side to the one side, left side in FIG. 2) in the circumferential direction of the coil end 4. Each of the plurality of coil ends 4 (4A, 4B) is made of a metal material (for example, copper) having a high electrical conductivity (conductivity), and its surface is insulated by an insulating member such as an insulating cap or an insulating tape.

[0018] Each of the plurality of reference spacers 06 is formed in a fan shape in which the cross-sectional shape (the contour shape that forms the outer shape) orthogonal to the axial direction of the rotor 2 has an increasing length (widening) in the circumferential direction of the rotor 2 as it goes outward in the radial direction of the rotor 2. Each of the plurality of reference spacers 06 is preferably made of a material (for example, fiber-reinforced plastic) having a specific gravity smaller than that of the material constituting the coil end portion 4 and a low electrical conductivity (conductivity).

[0019] For each of the plurality of reference spacers 06, one end face 061 on one side in the circumferential direction of the reference spacer 06 abuts against the other end face 43B of the coil end portion 4B arranged on one side in the circumferential direction with respect to the reference spacer 06, and the other end face 062 on the other side in the circumferential direction of the reference spacer 06 abuts against one end face 42A of the coil end portion 4A arranged on the other side in the circumferential direction with respect to the reference spacer 06. Each of the plurality of reference spacers 06 is configured not to protrude forward in the axial direction from the axial end faces 41A and 41B of the two coil end portions 4A and 4B arranged adjacent to the reference spacer 06.

[0020] As shown in FIG. 3, the rotating electrical machine 01 according to the comparative example further includes a plurality of bridging wires 5 each having one end 51 connected to one of the plurality of coil end portions 4. The other ends of the plurality of bridging wires 5 are connected to different terminals, respectively. Each of the plurality of bridging wires 5 forms an electrical path for electrically connecting the coil end portion 4 and the terminal. Each of the plurality of bridging wires 5 is made of a metal material (for example, copper) having a high electrical conductivity (conductivity), and its surface is insulated by an insulating member such as insulating tape.

[0021] The rotating electrical machine 01 according to the comparative example is configured to generate an electromagnetic force by rotating a rotor 2 having an N pole and an S pole inside a stator coil 32. When an electromagnetic force is generated in the stator coil 32, electromagnetic vibration is generated. There is a possibility that a large electromagnetic vibration may occur in a portion where the bridging wire 5 having one end 51 connected to the coil end portion 4 of the stator coil 32 protrudes forward in the axial direction from the coil end portion 4. Therefore, suppressing the electromagnetic vibration generated in the bridging wire 5 becomes an issue.

[0022] (Coil End Support Structure of Rotating Electrical Machine According to One Embodiment) FIG. 4 is a schematic perspective view showing a state in which a plurality of coil ends 4 and a plurality of spacers 6 of a rotating electrical machine 1 according to one embodiment are assembled. FIG. 5 is a schematic perspective view showing a state in which a plurality of coil ends 4, a plurality of spacers 6, and a plurality of bridging wires 5 of the rotating electrical machine 1 according to one embodiment are assembled.

[0023] As shown in FIG. 4, the stator coil 32 of the rotating electrical machine 1 according to one embodiment has a plurality of coil ends 4 arranged at intervals in the circumferential direction of the rotor 2 on one side (front side) in the axial direction of the rotor 2.

[0024] As shown in FIG. 5, the rotating electrical machine 1 further includes at least one (a plurality in the illustrated example) bridging wire 5 having one end 51 connected to one of two coil ends 4A and 4B arranged adjacent to each other in the circumferential direction of the rotor 2 among the plurality of coil ends 4, and at least one (a plurality in the illustrated example) spacer 6 partially arranged between the two coil ends 4A and 4B to which one end 51 of at least one bridging wire 5 is connected on one side. Each of the plurality of spacers 6 is preferably made of a material having a specific gravity smaller than that of the material constituting the coil end 4 and a low electrical conductivity (conductivity) (for example, fiber-reinforced plastic). Each of the plurality of spacers 6 may be made of the same material as the reference spacer 06.

[0025] As shown in FIGS. 4 and 5, the reference spacer 06 described above is arranged at a location where no spacer 6 is arranged between two coil ends 4A and 4B among the plurality of coil ends 4 (for example, between two coil ends 4A and 4B to which no bridging wire 5 is connected). That is, the rotating electrical machine 1 further includes at least one (a plurality in the illustrated example) reference spacer 06 individually arranged between two coil ends 4A and 4B where no spacer 6 is arranged.

[0026] Next, an example will be described in which a wire 5 is connected across a coil end 4A located on the other side in the circumferential direction than the spacer 6 among the two coil ends 4A and 4B. However, the present disclosure is also applicable when the wire 5 is connected across the coil end 4B located on one side in the circumferential direction than the spacer 6.

[0027] (Spacer) As shown in FIG. 4, each of the plurality of spacers 6 includes a base end portion 7 disposed between the two coil ends 4A and 4B so as to abut against each of the two coil ends 4A and 4B, and a tip end portion 8 protruding from the base end portion 7 to one side (front side) in the axial direction from the axial end faces 41A and 41B of each of the two coil ends 4A and 4B.

[0028] As shown in FIG. 4, the base end portion 7 is formed in a fan shape in which the cross-sectional shape (the contour shape forming the outer shape) orthogonal to the axial direction of the rotor 2 has an increasing length (becoming wider) in the circumferential direction of the rotor 2 as it goes toward the outside in the radial direction of the rotor 2. One end face 71 of the base end portion 7 in the one side in the circumferential direction abuts against the other end face 43B of the coil end 4B disposed on the one side in the circumferential direction with respect to the base end portion 7, and the other end face 72 of the base end portion 7 in the other side in the circumferential direction abuts against one end face 42A of the coil end 4A disposed on the other side in the circumferential direction with respect to the base end portion 7.

[0029] FIG. 6A is a schematic view showing one end face (the end face on one side in the circumferential direction of the rotor 2) of the spacer 6 in one embodiment. FIG. 6B is a schematic view showing the state of the spacer 6 in one embodiment from the A direction (the outer side in the radial direction of the rotor 2) shown in FIG. 6A. FIG. 6C is a schematic view showing the state of the spacer 6 in one embodiment from the B direction (the rear side in the axial direction of the rotor 2) shown in FIG. 6A. FIG. 7A is a schematic view showing one end face (the end face on one side in the circumferential direction of the rotor 2) of the spacer 6 in one embodiment. FIG. 7B is a schematic view showing the state of the spacer 6 in one embodiment as viewed from the C direction (the outer side in the radial direction of the rotor 2) shown in FIG. 7A. FIG. 7C is a schematic view showing the state of the spacer 6 in one embodiment as viewed from the D direction (the inner side in the radial direction of the rotor 2) shown in FIG. 7A. In FIGS. 7A to 7C, the coil end portion 4 to which the continuous line 5 and one end 51 of the continuous line 5 are connected is also shown together with the spacer 6. In FIGS. 4, 6B, 7B, and 7C, the boundary between the base end portion 7 and the tip end portion 8 of the spacer 6 is indicated by a two-dot chain line, but the base end portion 7 and the tip end portion 8 may be integrally formed.

[0030] (Contact surface) As shown in FIGS. 5 and 7A to 7C, the tip end portion 8 of the spacer 6 described above has at least one contact surface 81 that contacts at least one continuous line 5.

[0031] As shown in FIGS. 5, 7B, and 7C, at least one continuous line 5 includes an axially extending portion 52 that extends from one end 51 connected to the coil end portion 4 (4A) along the axial direction to one side (front side) in the axial direction, and a circumferentially extending portion 54 that extends from the other end 53 of the axially extending portion 52 along the circumferential direction. The spacer 6 is arranged on the side where the circumferentially extending portion 54 extends from the other end 53 of the axially extending portion 52 in the circumferential direction with respect to the coil end portion 4 (4A) to which the continuous line 5 is connected.

[0032] As shown in FIG. 5, at least one bridging line 5 may further include an arc portion 55 extending along the circumferential direction on the outer side in the radial direction of the stator coil 32, and a connection portion 56 having one end connected to the arc portion 55 and the other end connected to an end opposite to the end connected to the axial extension portion 52 of the circumferential extension portion 54. The circumferential extension portion 54 is located on one side (front side) in the axial direction and on the inner side in the radial direction with respect to the arc portion 55.

[0033] The bridging line 5 having one end connected to the coil end 4 may vibrate due to vibration transmitted from the coil end 4 or the like. Specifically, the rotating electrical machine 1 is configured to generate an electromagnetic force by rotating the rotor 2 having an N pole and an S pole inside the stator coil 32, similar to the rotating electrical machine 01 according to the comparative example. When an electromagnetic force is generated in the stator coil 32, electromagnetic vibration is generated. In the bridging line 5 having one end 51 connected to the coil end 4 of the stator coil 32, large electromagnetic vibration may occur in a portion (axial extension portion 52 and circumferential extension portion 54) protruding forward in the axial direction with respect to the coil end 4.

[0034] According to the above configuration, by bringing the contact surface 81 of the tip portion 8 into contact with the bridging line 5, specifically, a portion (axial extension portion 52 and circumferential extension portion 54) protruding forward in the axial direction with respect to the coil end 4, the rigidity against vibration can be increased, and thus the vibration of the bridging line 5 can be effectively suppressed.

[0035] (First contact surface) In some embodiments, at least one contact surface 81 described above is a first contact surface 82 which is an end surface on one side (front side) in the axial direction of the tip portion 8, as shown in FIGS. 5, 7A to 7C, and includes the first contact surface 82 that contacts the circumferential extension portion 54. In the illustrated embodiment, the circumferential extension portion 54 is formed in a plate shape, and the first contact surface 82 contacts an end surface on the tip portion 8 side in the plate thickness direction.

[0036] Each of the plurality of coil ends 4 is supported by two spacers (spacer 6, reference spacer 06) arranged adjacent to each other in the circumferential direction of the rotor 2, so that vibration along the circumferential direction of the rotor 2 is less likely to occur. For this reason, vibrations along the axial direction or the radial direction of the rotor 2 are more likely to occur in the overhang wire 5 having one end connected to the coil end 4 than vibrations along the circumferential direction of the rotor 2. According to the above configuration, by bringing the first contact surface 82 into contact with the circumferential extension portion 54 of the overhang wire 5, the movement of the overhang wire 5 in the axial direction of the rotor 2 is restricted by the first contact surface 82, so that vibrations of the overhang wire 5, particularly vibrations along the axial direction of the rotor 2 of the overhang wire 5, can be effectively suppressed.

[0037] (Second contact surface) In some embodiments, at least one of the above-described contact surfaces 81 is a second contact surface 83 which is an end surface on the side (one side) where the circumferential axial extension portion 52 of the tip portion 8 is located, as shown in FIGS. 5 and 7A to 7C, and further includes a second contact surface 83 that contacts the axial extension portion 52. In the illustrated embodiment, the axial extension portion 52 is formed in a plate shape, and the second contact surface 83 contacts the end surface on the tip portion 8 side in the plate thickness direction.

[0038] According to the above configuration, by bringing the second contact surface 83 into contact with the axial extension portion 52 of the overhang wire 5, the movement of the overhang wire 5 in the circumferential direction of the rotor 2 is restricted by the second contact surface 83, so that vibrations of the overhang wire 5, particularly vibrations along the circumferential direction of the rotor 2 of the overhang wire 5, can be effectively suppressed.

[0039] (Chamfered portion) In some embodiments, the tip portion 8 of the above-described spacer 6 has a chamfered portion 84 that obliquely connects between the first contact surface 82 and the second contact surface 83, as shown in FIGS. 4, 6B, 7B, and 7C.

[0040] When viewed from one side in the radial direction of the rotor 2 as shown in FIGS. 7B and 7C, the chamfered portion 84 extends along a direction intersecting each of the first contact surface 82 and the second contact surface 83, with one end connected to the first contact surface 82 and the other end connected to the second contact surface 83. When viewed from one side in the radial direction of the rotor 2 as shown in FIGS. 7B and 7C, the other end 53 of each of the plurality of bridging lines 5 connected to the circumferential extending portion 54 of the axial extending portion 52 has an R shape (i.e., a curved surface shape having a predetermined radius of curvature). A gap is provided between the chamfered portion 84 and the other end 53 having an R shape, and they are not in contact with each other.

[0041] According to the above configuration, by providing the chamfered portion 84 between the first contact surface 82 and the second contact surface 83 of the tip portion 8, the seating of the bridging line 5 on the spacer 6 is improved, and the first contact surface 82 can be brought into contact with the circumferential extending portion 54 over a wide range, and the second contact surface 83 can be brought into contact with the axial extending portion 52 over a wide range. By increasing the contact area of the bridging line 5 with the contact surface 81 (the first contact surface 82 or the second contact surface 83), the vibration of the bridging line 5 can be effectively suppressed compared to the case where the contact area is small.

[0042] (First bridging line, second bridging line) In some embodiments, as shown in FIG. 5, at least one of the above-described bridging lines 5 includes a first bridging line 5A having one end 51A connected to one of two coil ends 4A and 4B arranged with the spacer 6 interposed therebetween in the circumferential direction of the rotor 2, and a second bridging line 5B having one end 51B connected to a position radially inner than the connection position P1 of the first bridging line 5A of the coil end 4A connected to the first bridging line 5A. At least one of the above-described contact surfaces 81 includes a surface (such as the first contact surface 82) that contacts each of the first bridging line 5A and the second bridging line 5B. Note that the rotating electrical machine 1 may include a plurality of bridging line groups in which each group is connected to a different coil end 4 when a combination of the first bridging line 5A and the second bridging line 5B connected to one of two coil ends 4A and 4B arranged with the spacer 6 interposed therebetween in the circumferential direction of the rotor 2 is regarded as one bridging line group.

[0043] Each of the first cross line 5A and the second cross line 5B includes an axially extending portion 52 (52A, 52B) having one end 51 (51A, 51B) and the other end 53 (53A, 53B) as described above, a circumferentially extending portion 54 (54A, 54B) as described above, an arc portion 55 (55A, 55B) as described above, and a connecting portion 56 (56A, 56B) as described above, as shown in FIG. 5.

[0044] As shown in FIGS. 7A to 7C, the first contact surface 82 contacts each of the circumferentially extending portion 54A of the first cross line 5A and the circumferentially extending portion 54B of the second cross line 5B located inside the circumferentially extending portion 54A in the radial direction. The first contact surface 82 includes a first outer contact surface 82A that contacts the circumferentially extending portion 54A and a first inner contact surface 82B that is located inside the first outer contact surface 82A in the radial direction and contacts the circumferentially extending portion 54B.

[0045] As shown in FIGS. 7B and 7C, the second contact surface 83 contacts each of the axially extending portion 52A of the first cross line 5A and the axially extending portion 52B of the second cross line 5B located inside the axially extending portion 52A in the radial direction.

[0046] According to the above configuration, by bringing the contact surface 81 of the tip portion 8 into contact with each of the pair of cross lines 5A and 5B to which the one ends 51A and 51B are connected to one coil end portion 4A, the pair of cross lines 5A and 5B are supported by the contact surface 81, so that the vibration of the pair of cross lines 5A and 5B can be effectively suppressed.

[0047] (Projection of the tip portion) In some embodiments, as shown in FIGS. 5, 6A, 6B, and 7A, the tip portion 8 described above has a protruding portion 85 that protrudes from the first contact surface 82 to one side (front side) in the axial direction. The protruding portion 85 has a rectangular cross-sectional shape (a contour shape that forms the outer shape) perpendicular to the axial direction of the rotor 2. The protruding portion 85 is provided inside the first outer contact surface 82A in the radial direction and outside the first inner contact surface 82B in the radial direction.

[0048] (Third abutting surface) In some embodiments, at least one of the above-described abutting surfaces 81 is a third abutting surface 851 which is one end surface in the radial direction of the protruding portion 85 as shown in FIG. 7A, and further includes a third abutting surface 851 which abuts against the circumferential extension portion 54.

[0049] In the illustrated embodiment, the third abutting surface 851 includes a third outer abutting surface 851A which is the outer end surface in the radial direction of the protruding portion 85, and a third inner abutting surface 851B which is the inner end surface in the radial direction of the protruding portion 85. The third outer abutting surface 851A abuts against the inner edge in the radial direction of the circumferential extension portion 54A of the first extending line 5A. The third inner abutting surface 851B abuts against the outer edge in the radial direction of the circumferential extension portion 54B of the second extending line 5B.

[0050] According to the above configuration, by abutting the third abutting surface 851 which is one end surface in the radial direction of the protruding portion 85 against the circumferential extension portion 54 of the extending line 5, the radial movement of the rotor 2 of the extending line 5 is restricted by the third abutting surface 851, so that the vibration of the extending line 5, particularly the vibration along the radial direction of the rotor 2 of the extending line 5, can be effectively suppressed.

[0051] (Step surface) In some embodiments, as shown in FIGS. 4, 6A to 6C, the above-described tip portion 8 is a step surface 86 formed between the tip portion 8 and the base end portion 7, and extends on the side away from one coil end portion 4A to which at least one extending line 5 is connected in the circumferential direction (the coil end portion 4B side where the extending line 5 is not connected) with respect to the base end portion 7. The step surface 86 abuts at least partially against the axial end surface 41B of the other coil end portion 4B among the two coil end portions 4A and 4B.

[0052] According to the above configuration, by abutting the step surface 86 of the tip portion 8 against the axial end surface 41B of the coil end portion 4B, the seating against the coil end portion 4B of the spacer 6 is improved, so that the vibration of the extending line 5, particularly the vibration along the axial direction of the rotor 2 of the extending line 5, can be effectively suppressed.

[0053] (Shape of the spacer) In some embodiments, as shown in FIG. 6C, the above-described base end portion 7 has a cross-sectional shape (a contour shape that forms the outer shape) orthogonal to the axial direction of the rotor 2, and the length in the circumferential direction of the rotor 2 increases (becomes wider) as it goes toward the outside in the radial direction of the rotor 2, and is formed in a fan shape. The above-described tip end portion 8 has a cross-sectional shape (a contour shape that forms the outer shape) orthogonal to the axial direction of the rotor 2, and is formed in a rectangular shape.

[0054] In the illustrated embodiment, one end surface 71 on one side in the circumferential direction of the base end portion 7 is continuously connected to the second contact surface 83 of the tip end portion 8 without a step, and the other end surface 72 on the other side in the circumferential direction of the base end portion 7 is connected to the second contact surface 83 of the tip end portion 8 via a stepped surface 86 to the end surface 87 on the opposite side in the circumferential direction. The other end surface 72 on the other side in the circumferential direction of the base end portion 7 is inclined toward the end surface 71 side as it goes inward in the radial direction compared to the end surface 87. As a result, the stepped surface 86 increases in length (becomes wider) in the circumferential direction of the rotor 2 as it goes inward in the radial direction.

[0055] According to the above configuration, by making the cross-sectional shape orthogonal to the axial direction of the base end portion 7 fan-shaped and the cross-sectional shape orthogonal to the axial direction of the tip end portion 8 rectangular, a stepped surface 86 that becomes wider as it goes inward in the radial direction of the rotor 2 is formed at the tip end portion 8. In this case, the structure of the spacer 6 having the stepped surface 86 can be made simple, and the spacer 6 can be prevented from becoming larger and heavier. By suppressing the increase in weight of the spacer 6, an increase in the vibration speed of the plurality of coil end portions 4 can be suppressed.

[0056] (Through hole) In some embodiments, as shown in FIGS. 4 to 6B and 7A, the tip end portion 8 of the above-described spacer 6 has a through hole 88 that penetrates from one end surface (second contact surface) 83, which is the end surface on the side (one side) where the circumferential axial extension portion 52 is located, to the other end surface 87, which is the end surface on the side (the other side) away from the circumferential axial extension portion 52.

[0057] In the illustrated embodiment, the through hole 88 is provided inside in the radial direction with respect to the first bridging wire 5A and outside in the radial direction with respect to the second bridging wire 5B.

[0058] By forming the through hole 88 in the tip portion 8, weight reduction of the spacer 6 can be achieved as compared with the case where the through hole 88 is not formed in the tip portion 8. By reducing the weight of the spacer 6, the vibration speed of the plurality of coil ends 4 can be reduced, and thus the vibration of the plurality of coil ends 4 can be suppressed. By suppressing the vibration of the plurality of coil ends 4, the vibration of the bridging wire 5 can be suppressed.

[0059] When configured to allow a cooling gas to flow inside the rotating electrical machine 1, since the through hole 88 serves as a ventilation path for the cooling gas, the cooling effect of the cooling gas can be effectively applied to the bridging wire 5, the spacer 6, the coil end 4 having one end connected to the bridging wire 5, and the like. Further, by forming the through hole 88 in the tip portion 8, it becomes easy to tie the bridging wire 5 to the tip portion 8 by the winding member 9 (see FIGS. 7A to 7C) passing through the through hole 88.

[0060] In some embodiments, the above-described through hole 88 has an elongated hole shape having a longitudinal direction along the axial direction of the spacer 6 (the direction along the axial direction of the rotor 2). In this case, it is easier to increase the opening area of the through hole 88 as compared with the case where the through hole 88 has a circular shape. Therefore, by forming the through hole 88 in the shape of an elongated hole, weight reduction of the spacer 6 can be achieved. Further, by forming the through hole 88 in the shape of an elongated hole, the flow of the cooling gas through the through hole 88 is promoted, and the cooling effect of the cooling gas can be effectively applied to the bridging wire 5, the spacer 6, the coil end 4 having one end connected to the bridging wire 5, and the like. Note that in some other embodiments, the above-described through hole 88 may have a circular shape.

[0061] In some embodiments, as shown in FIGS. 7A to 7C, the above-described rotating electrical machine 1 further includes at least one winding member 9 that is wound around the through hole 88 of the spacer 6 to tie at least one bridging wire 5 to the tip portion 8.

[0062] In the illustrated embodiment, at least one winding member 9 includes a first winding member 9A and a second winding member 9B disposed radially inward of the first winding member 9A with respect to the rotor 2. The first winding member 9A is wound around the outer edge of the through hole 88 in the radial direction, and binds the first continuous line 5A to the tip 8 in a state where the axial extension 52A of the first continuous line 5A is in contact with the second contact surface 83. The second winding member 9B is wound around the inner edge of the through hole 88 in the radial direction, and binds the second continuous line 5B to the tip 8 in a state where the axial extension 52B of the second continuous line 5B is in contact with the second contact surface 83.

[0063] According to the above configuration, at least one continuous line 5 is bound to the tip 8 by at least one winding member 9, so that the rigidity of the continuous line 5, the spacer 6, and the coil end 4 having one end connected to the continuous line 5 can be improved, and thus vibration of the continuous line 5 can be reduced.

[0064] In this specification, expressions indicating relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric", or "coaxial" not only strictly represent such arrangements, but also represent a state of being relatively displaced with tolerances, or at angles and distances that provide the same function. For example, expressions indicating that things such as "identical", "equal", and "homogeneous" are in an equal state not only strictly represent an equal state, but also represent a state in which there are tolerances or differences that provide the same function. Also, in this specification, expressions indicating shapes such as a rectangular shape or a cylindrical shape not only represent the shapes such as a rectangular shape or a cylindrical shape in a geometrically strict sense, but also represent shapes including concave and convex portions, chamfered portions, etc. within a range where the same effect can be obtained. Also, in this specification, the expression that one component "comprises", "includes", or "has" is not an exclusive expression that excludes the existence of other components.

[0065] The present disclosure is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.

[0066] The content described in some of the above-described embodiments can be understood as follows, for example.

[0067] 1) The rotating electrical machine (1) according to at least one embodiment of the present disclosure is a rotor (2) and a stator (3) disposed so as to cover the outside in the radial direction of the rotor (2) and having a gap formed therebetween, the stator (3) including a stator core (31) and a stator coil (32), and a rotating electrical machine (1) including: the stator coil (32) has a plurality of coil ends (4) arranged at intervals in the circumferential direction of the rotor (2) on one side in the axial direction of the rotor (2), the rotating electrical machine (1) is at least one bridging wire (5) having one end (51) connected to one of two coil ends (4A, 4B) arranged adjacent to each other in the circumferential direction among the plurality of coil ends (4); a spacer (6) including a base end portion (7) disposed so as to contact each of the two coil ends (4A, 4B) between the two coil ends (4A, 4B), and a tip end portion (8) protruding from the base end portion (7) to one side in the axial direction rather than the axial end surfaces (41A, 41B) of each of the two coil ends (4A, 4B); and the tip end portion (8) has at least one contact surface (81) that contacts the at least one bridging wire (5).

[0068] According to the configuration of 1) above, by bringing the contact surface (81) of the tip end portion (8) into contact with the bridging wire (5), the rigidity against vibration can be increased, so that the vibration of the bridging wire (5) can be effectively suppressed.

[0069] 2) In some embodiments, the rotating electrical machine (1) described in 1) above is The at least one bridging wire (5) includes an axially extending portion (52) that extends from the one end (51) connected to the coil end portion (4) along the axial direction to the one side in the axial direction, and a circumferentially extending portion (54) that extends from the other end (53) of the axially extending portion (52) along the circumferential direction. The at least one contact surface (81) is a first contact surface (82) that is an end surface on the one side in the axial direction of the tip portion (8), and includes the first contact surface (82) that contacts the circumferentially extending portion (54).

[0070] Each of the plurality of coil end portions (4) is supported by two spacers arranged adjacent to each other in the circumferential direction of the rotor (2), so that vibration along the circumferential direction of the rotor (2) hardly occurs. For this reason, vibrations along the axial direction or the radial direction of the rotor (2) are more likely to occur in the bridging wire (5) having one end connected to the coil end portion (4) than vibrations along the circumferential direction of the rotor (2). According to the configuration of (2) above, by bringing the first contact surface (82) into contact with the circumferentially extending portion (54) of the bridging wire (5), the movement of the bridging wire (5) in the axial direction of the rotor (2) is restricted by the first contact surface (82). Therefore, vibrations of the bridging wire (5), particularly vibrations along the axial direction of the rotor (2) of the bridging wire (5), can be effectively suppressed.

[0071] 3) In some embodiments, the rotating electrical machine (1) described in 2) above, The at least one contact surface (81) is a second contact surface (83) that is an end surface on one end in the circumferential direction of the tip portion (8), and further includes the second contact surface (83) that contacts the axially extending portion (52).

[0072] According to the configuration of 3) above, by bringing the second contact surface (83) into contact with the axially extending portion (52) of the bridging wire (5), the movement of the bridging wire (5) in the circumferential direction of the rotor (2) is restricted by the second contact surface (83). Therefore, vibrations of the bridging wire (5), particularly vibrations along the circumferential direction of the rotor (2) of the bridging wire (5), can be effectively suppressed.

[0073] 4) In some embodiments, the rotating electrical machine (1) described in 3) above, The tip portion (8) has a chamfered portion (84) that obliquely connects between the first contact surface (82) and the second contact surface (83).

[0074] According to the configuration of 4) above, by providing the chamfered portion (84) between the first contact surface (82) and the second contact surface (83) of the tip portion (8), the seating of the spacer (6) of the overhang line (5) is improved, and the first contact surface (82) can be brought into contact with the circumferential direction extending portion (54) over a wide range, and the second contact surface (83) can be brought into contact with the axial direction extending portion (52) over a wide range. By increasing the contact area of the overhang line (5) with the contact surfaces (81, the first contact surface 82, and the second contact surface 83), the vibration of the overhang line (5) can be effectively suppressed compared to the case where the contact area is small.

[0075] 5) In some embodiments, the rotating electrical machine (1) described in any one of 2) to 4) above, The tip portion (8) has a protruding portion (85) that protrudes from the first contact surface (82) to the one side in the axial direction, The at least one contact surface (81) is a third contact surface (851) that is one end surface in the radial direction of the protruding portion (85), and further includes a third contact surface (851) that contacts the circumferential direction extending portion (54).

[0076] According to the configuration of 5) above, by bringing the third contact surface (851), which is one end surface in the radial direction of the protruding portion (85), into contact with the circumferential direction extending portion (54) of the overhang line (5), the radial movement of the rotor (2) of the overhang line (5) is restricted by the third contact surface (851), so that the vibration of the overhang line (5), particularly the vibration along the radial direction of the rotor (2) of the overhang line (5), can be effectively suppressed.

[0077] 6) In some embodiments, the rotating electrical machine (1) described in any one of 1) to 5) above, The at least one overhang line (5) is A first overhang line (5A) having one end (51A) connected to one of the two coil ends (4A, 4B), A second cross wire (5B) having one end (51B) connected to the inside in the radial direction from the connection position (P1) of the first cross wire (5A) of the coil end (4A) connected to the first cross wire (5A). The at least one contact surface (81) includes a surface (such as the first contact surface 82) that contacts each of the first cross wire (5A) and the second cross wire (5B).

[0078] According to the configuration of 6) above, by bringing the contact surface (81) of the tip portion (8) into contact with each of a pair of cross wires (5A, 5B) each having one end (51A, 51B) connected to one coil end (4A), the pair of cross wires (5A, 5B) is supported by the contact surface (81), so that the vibration of the pair of cross wires (5A, 5B) can be effectively suppressed.

[0079] 7) In some embodiments, a rotating electrical machine (1) according to any one of 1) to 6) above, The tip portion (8) is a stepped surface (86) formed between the base end portion (7), and has a stepped surface (86) that extends in a direction away from the coil end (4A) to which the at least one cross wire (5) is connected more than the base end portion (7) in the circumferential direction. At least a part of the stepped surface (86) contacts the axial end surface (41B) of the other coil end (4B) among the two coil ends (4A, 4B).

[0080] According to the configuration of 7) above, by bringing the stepped surface (86) of the tip portion (8) into contact with the axial end surface (41B) of the coil end (4B), the seating of the spacer (6) against the coil end (4B) is improved, so that the vibration of the cross wire (5), particularly the vibration of the cross wire (5) along the axial direction of the rotor (2), can be effectively suppressed.

[0081] 8) In some embodiments, a rotating electrical machine (1) according to 7) above, The base end portion (7) is formed in a fan shape in which the cross-sectional shape perpendicular to the axial direction has an increasing length in the circumferential direction as it goes toward the outside in the radial direction. The tip portion (8) is formed with a rectangular cross-sectional shape perpendicular to the axial direction.

[0082] According to the configuration of 8) above, by making the cross-sectional shape perpendicular to the axial direction of the base end portion (7) fan-shaped and the cross-sectional shape perpendicular to the axial direction of the tip portion (8) rectangular, a stepped surface (86) whose width increases toward the inner side in the radial direction of the rotor (2) is formed at the tip portion (8). In this case, the structure of the spacer (6) having the stepped surface (86) can be made simple, and an increase in the size and weight of the spacer (6) can be suppressed. By suppressing an increase in the weight of the spacer (6), an increase in the vibration speed of the plurality of coil end portions (4) can be suppressed.

[0083] 9) In some embodiments, the rotating electrical machine (1) according to any one of 1) to 8) above, The tip portion (8) has a through-hole (88) penetrating from one end surface (83) in the circumferential direction to the other end surface (87).

[0084] According to the configuration of 9) above, by forming the through-hole (88) in the tip portion (8), the weight of the spacer (6) can be reduced compared to the case where the through-hole (88) is not formed in the tip portion (8). By reducing the weight of the spacer (6), the vibration speed of the plurality of coil end portions (4) can be reduced, so that the vibration of the plurality of coil end portions (4) can be suppressed. By suppressing the vibration of the plurality of coil end portions (4), the vibration of the overhang wire (5) can be suppressed. When the rotating electrical machine (1) is configured to allow a cooling gas to flow inside, the through-hole (88) serves as a ventilation path for the cooling gas, so that the cooling effect of the cooling gas can be effectively applied to the overhang wire (5), the spacer (6), the coil end portion (4) having one end connected to the overhang wire (5), and the like. Further, by forming the through-hole (88) in the tip portion (8), it becomes easy to tie the overhang wire (5) to the tip portion (8) with the winding member (9) passing through the through-hole (88).

[0085] 10) In some embodiments, the rotating electrical machine (1) according to 9) above, Further provided is at least one winding member (9) wound around the through hole (88) to tie the at least one bridging wire (5) to the tip portion (8).

[0086] According to the configuration of (10) above, by tying the at least one bridging wire (5) to the tip portion (8) with the at least one winding member (9), the rigidity of the bridging wire (5), the spacer (6), and the coil end portion (4) having one end connected to the bridging wire (5) can be improved, so that the vibration of the bridging wire (5) can be reduced.

Explanation of Reference Numerals

[0087] 1,01 Rotating Electric Machine 2 Rotor 3 Stator 4,4A,4B Coil End Portion 5 Bridging Wire 5A First Bridging Wire 5B Second Bridging Wire 06 Reference Spacer 6 Spacer 7 Base End Portion 8 Tip Portion 9 Winding Member 31 Stator Core 32 Stator Coil 33 Stator Coil Main Body Portion 41,41A,41B Axial End Face 51,51A,51B One End 52,52A,52B Axial Direction Extension Portion 53,53A,53B Other End 54,54A,54B Circumferential Direction Extension Portion 55,55A,55B Arc Portion 56,56A,56B Connection Portion 81 Contact Surface 82 First Contact Surface 83 Second Contact Surface 84 Chamfered Portion 85 Protrusion 86 Step Surface 87 Other End Face 88 Through Hole 851 Third Contact Surface LA Axis P1 connection position

Claims

1. A rotating electrical machine comprising a rotor and a stator disposed so as to cover the outside in the radial direction of the rotor with a gap formed between the rotor and the stator, the stator including a stator core and a stator coil. The stator coil has a plurality of coil end portions arranged at intervals in the circumferential direction of the rotor on one side in the axial direction of the rotor. The rotating electrical machine further includes: At least one bridging wire having one end connected to one of two coil end portions arranged adjacent to each other in the circumferential direction among the plurality of coil end portions; A spacer including a base end portion disposed so as to contact each of the two coil end portions between the two coil end portions, and a tip end portion protruding from the base end portion to one side in the axial direction beyond the axial end faces of each of the two coil end portions. The tip end portion has at least one contact surface that contacts the at least one bridging wire. Rotating electrical machine.

2. The at least one bridging wire includes an axially extending portion extending from the one end connected to the coil end portion along the axial direction to the one side in the axial direction, and a circumferentially extending portion extending from the other end of the axially extending portion along the circumferential direction. The at least one contact surface is a first contact surface that is an end face on the one side in the axial direction of the tip end portion, and includes a first contact surface that contacts the circumferentially extending portion. The rotating electrical machine according to claim 1.

3. The at least one contact surface is a second contact surface that is an end face in the circumferential direction of the tip end portion, and further includes a second contact surface that contacts the axially extending portion. The rotating electrical machine according to claim 2.

4. The tip end portion has a chamfered portion that obliquely connects between the first contact surface and the second contact surface. The rotating electrical machine according to claim 3.

5. The tip portion has a protruding portion that protrudes from the first contact surface toward the one side in the axial direction. The at least one contact surface is a third contact surface that is one end surface in the radial direction of the protruding portion, and further includes a third contact surface that contacts the circumferential direction extending portion. The rotating electrical machine according to any one of claims 2 to 4.

6. The at least one bridging wire includes a first bridging wire having one end connected to one of the two coil ends, and a second bridging wire having one end connected to the inside in the radial direction from the connection position of the first bridging wire to the coil end connected to the first bridging wire. The at least one contact surface includes surfaces that contact the first bridging wire and the second bridging wire, respectively. The rotating electrical machine according to any one of claims 1 to 5.

7. The tip portion is a stepped surface formed between the base end portion, and has a stepped surface that extends in a direction away from the coil end portion to which the at least one bridging wire is connected in the circumferential direction and is farther than the base end portion. At least a part of the stepped surface contacts the axial end surface of the other coil end portion among the two coil end portions. The rotating electrical machine according to any one of claims 1 to 6.

8. The base end portion is formed in a fan shape in which the length in the circumferential direction increases as the cross-sectional shape perpendicular to the axial direction faces outward in the radial direction. The tip portion is formed with a rectangular cross-sectional shape perpendicular to the axial direction. The rotating electrical machine according to claim 7.

9. The tip portion has a through hole that penetrates from one end surface to the other end surface in the circumferential direction. The rotating electrical machine according to any one of claims 1 to 8.

10. Further comprising at least one winding member wound around the through hole to tie the at least one spanning wire to the tip portion The rotating electrical machine according to claim 9

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