JP2020010504A - Stator of rotary electric machine - Google Patents

Abstract

To provide a stator of a rotary electric machine capable of suppressing a damage of a coupling part even if excess vibration is added at the coupling part having electric junction of adjacent conducting wires at an end of conducting wires projecting from the stator, which is used for winding of the conducting wires of the stator of the rotary electric machine, and the coupling part of a plurality of conducting wires for performing output to the outside.SOLUTION: A stator 10 of a rotary electric machine is provided with: a cap-shaped container part 34 consisting of a side wall 38 and a bottom wall 40, arranged to surround a coupling part 26; and an adhesive 46 which is filled in a space between the coupling part 26 and the container part 34; and a receiving part 36 which receives the adhesive 46 overflown from the container part 46. Thus, even when excess vibration stress, especially vibration in a direction for opening two joined conducting wires 28 to a joint part 26 is added, it becomes possible to suppress a damage to be generated due to such vibration stress.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a stator of a rotating electric machine having an electrical connection between a plurality of conductors wound around a stator core of the rotating electric machine.

  2. Description of the Related Art A method of winding a conductive wire around a stator core of a rotating electric machine is known. For example, in Patent Literature 1, a plurality of insulation-coated conductors respectively inserted into a plurality of concave grooves formed on an inner peripheral surface of a stator core are electrically connected to each other by welding at ends of the conductors protruding from the stator core. , Whereby the stator core is wound around the conductor. Thus, a three-phase stator having a U phase, a V phase, and a W phase is formed.

JP 2017-93046 A

  According to the method of winding a conductive wire used for the stator of the rotating electric machine disclosed in Patent Document 1, that is, a method of electrically connecting the ends of a plurality of adjacent conductive wires protruding from the stator core by welding, the winding of the conductive wire around the stator core is performed. It becomes easy, and it is possible to reduce the conductive wire protruding from the stator core. However, when excessive vibration stress acts on the conductor, at the joint between the conductors that welds the plurality of conductors protruding from the stator core, particularly in a direction in which the two joined conductors are opened with respect to the joint. When the vibration is applied, the joint may be damaged.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to apply excessive vibration stress to a coupling portion that electrically connects a plurality of conductors used in a stator of a rotating electric machine. Even if is added, it is to effectively suppress the damage of the connecting portion.

  The gist of the first invention includes (a) a stator core, a plurality of conductors wound around the stator core and forming a power line, and a plurality of conductors electrically connected to the plurality of conductors. And (b) a side wall and a bottom wall, the container including the plurality of coupling portions, and a container filled with the plurality of coupling portions, wherein the container includes: A protection case is provided which integrally includes an adhesive for fixing the accommodated coupling portion and a receiving portion for receiving the uncured adhesive overflowing from the container portion.

  The gist of the second invention is that, in the stator of the rotating electric machine of the first invention, a plurality of grooves are formed at a plurality of positions in a circumferential direction on an inner peripheral surface of a side wall constituting the container portion. It is characterized by.

  The gist of the third invention is that in the stator of the rotating electric machine of the first invention or the second invention, a plurality of the container portions and the receiving portions are integrally formed.

  According to a fourth aspect of the present invention, in the stator for a rotating electric machine according to any one of the first to third aspects, the adhesive is a resin material.

  According to a fifth aspect of the present invention, in the stator for a rotating electrical machine according to any one of the first to third aspects, the adhesive is a conductive material.

  According to a sixth aspect of the present invention, in the stator for a rotating electrical machine according to any one of the first to third aspects, an opening through which the coupling portion is inserted is provided in a bottom wall of the container portion. .

  According to the first aspect, the stator includes: a stator core; a plurality of conductors wound around the stator core and forming a power line; and a plurality of coupling portions to which the plurality of conductors are electrically connected. The rotating electric machine, comprising a side wall and a bottom wall, each housing the plurality of connecting portions, and fixing the connecting portion filled in the container portion and housed in the container portion. A protective case is provided that integrally includes an adhesive and a receiving portion that receives the uncured adhesive overflowing from the container. Thereby, by filling the space between the connecting portion of the conductor and the container portion with the adhesive, excessive vibration stress, particularly vibration in a direction in which the two joined conductors are opened with respect to the joint, is reduced. Even when it is applied, it is possible to suppress damage caused by such vibration stress. Further, when the adhesive overflows and fills from the container portion disposed so as to surround the coupling portion, the adhesive flows out to the receiving portion formed around the container portion, whereby the coupling portion is formed. Is kept uniform. Thereby, it is possible to keep the suppression of vibration by the adhesive uniform.

  According to the second invention, a plurality of grooves are formed at a plurality of positions in the circumferential direction on the inner peripheral surface of the side wall constituting the container portion. Thereby, detachment of the adhesive from the container is suppressed.

  According to the third aspect, the plurality of container portions and the receiving portion are integrally formed. Thereby, the number of parts can be reduced.

  According to a fourth aspect, the adhesive is a resin material. This suppresses damage due to excessive stress in the joints, and further improves the insulation between the adjacent joints.

  According to the fifth invention, the adhesive is a conductive material. This suppresses damage due to excessive stress at the joint, and improves conductivity at the joint.

  According to the sixth invention, an opening through which the coupling portion is inserted is provided on the bottom wall of the container portion. Thereby, when the coupling portion is located above the stator core after the stator core is installed on the vehicle and the bottom wall of the container portion does not have an opening for inserting the coupling portion, the container of the adhesive may be used. In order to suppress leakage from the part, the stator core is turned over, the container part is assembled to the connection part, and after the viscosity of the adhesive increases, the stator core is turned over again and installed on the vehicle. Had to do. By providing an opening in the bottom wall of the container, the necessity of the above-mentioned reversal of the stator core is eliminated, and the assembly of the container is facilitated.

1 is a perspective view illustrating a schematic configuration of a stator of a rotating electric machine to which the present invention is applied. It is sectional drawing which showed typically the structure of the container part and receiving part of the protective case of FIG. After accommodating the adhesive in the container part of the protective case of FIG. 2, the connecting part of the lead wire is inserted into the container part, and the function of the receiving part when the adhesive overflows over the side wall of the container part is described in a schematic view. FIG. FIG. 2 is a perspective view showing an example of a mutual arrangement of a connecting portion of a conductive wire and a protective case for holding the connecting portion with an adhesive in the stator of the rotating electric machine of FIG. 1. FIG. 4 is an enlarged view showing a groove formed on an inner peripheral side of a side wall of the container unit in FIGS. 2 and 3. It is the figure which showed an example which formed the groove | channel in the inner periphery of the container part of the protective case which has several container parts. FIG. 4 is a schematic diagram showing a case where the stator is installed in a vehicle at a position where the bottom wall of the container is above the coupling after the coupling of FIG. 3 is accommodated in the container. It is a schematic diagram showing a case in which an opening through which a coupling portion is inserted uses a protective case formed on a bottom wall of a container portion.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following examples, the drawings are simplified or modified as appropriate, and the dimensional ratios, shapes, and the like of the respective parts are not necessarily drawn accurately.

  The stator 10 of the rotating electric machine shown in FIG. 1 includes, for example, a cylindrical stator core 12 made of an electromagnetic steel plate, a stator coil 18, a power line 24, and a conducting wire 28 made up of a bus bar 22 shown in FIGS. And On the inner peripheral surface of the cylindrical stator core 12, a plurality of concave grooves, that is, slots 14, having a depth in a direction toward the outer peripheral side and penetrating in the width direction are formed, and are formed between adjacent slots 14. The wound teeth are wound around the stator coil 18 to form windings. The stator coil 18 is a conductive wire 28 made of, for example, a copper or copper alloy conductor coated with an insulating film. The stator coil 18 is inserted into the slot 14 of the stator core 12 and projects from the slot 14 to the outside of the stator core 12. The coil end 20 is electrically connected by, for example, TIG (Tungsten Inert Gas) welding. The stator core 12 is not necessarily made of an electromagnetic steel sheet, but may be formed by, for example, forming a powder or a solid of a magnetic material.

  The stator coil 18 wound around the teeth 16 forms a three-phase winding composed of a U-phase, a V-phase, and a W-phase. The ends of each stator coil 18 are connected to the bus bar 22 shown in FIG. The bus bar 22 is further electrically connected to a power line 24. In FIG. 1, three power lines 24 are shown, and external terminals 32 for connection with an inverter (not shown) are mounted at the ends. The stator coil 18, the bus bar 24, and the power line 24 constitute a conductor 28 of the stator core 12. The joint 26 shown in FIG. 3, which is an electric joint between the bus bar 22 and the power line 24 and an electric joint between the plurality of bus bars 22, is disposed inside the protective case 30 and the protective case 31. Have been.

  In FIG. 2, an adhesive 46 used to reinforce the joint strength of the connecting portion 26 where the bus bar 22 and the power line 24 shown in FIG. The state where the container portion 34 of the container 31 is filled is schematically shown. In order to suppress the bus bar 22 and the power line 24 from vibrating in the opening direction with respect to the joint 26, the viscosity at the time of filling the adhesive 46 is increased by heating, elapse of time, ultraviolet irradiation, or the like. For example, a resin material containing a silicon resin, an epoxy resin, or the like is used. Each of the protective cases 30 and 31 includes a cap-shaped container portion 34 having a bottom wall 40 and a side wall 38, and a bottom wall 42 and an outer peripheral portion 52, and extends around at least a part of the outer periphery of the container portion 34. And a receiving portion 36 formed. The bottom wall 40 of the container part 34 and the bottom wall 42 of the receiving part 36 are formed integrally with each other, and have the same thickness and the same plane.

  FIG. 3 schematically shows a state in which the connecting portion 26 in which the bus bar 22 and the power line 24 are joined by welding is accommodated in the adhesive 46 shown in FIG. The upper white arrow indicates the direction of movement of the connecting portion 26 from above to below in order to insert the connecting portion 26 into the interior of the container portion 34. The arrow indicated by the curve indicates a state in which the extra uncured adhesive 46 in the container portion 34 overflows from the container portion 34 and flows into the receiving portion 36 by accommodating the coupling portion 26. The joint 26 between the bus bar 22 and the power line 24 is accommodated in a container 34 formed in the protective cases 30 and 31, and the space between the container 34 and the joint 26 is filled with an adhesive 46. As a result, the connecting portion 26 is fixed inside the container portion 34 of the protective cases 30 and 31, and the joining strength of the connecting portion 26 is reinforced. Further, when the fluid adhesive 46 which has flown in the uncured stage has passed over the side wall 38, it flows out of the container portion 34 to the receiving portion 36, so that the height of the adhesive 46 in the container portion 34 is kept uniform. Dripping.

  FIG. 4 is an enlarged view of an example of the protection case 30. The protective case 30 is provided between the four container portions 34 for accommodating the coupling portions 26 and the adjacent container portions 34 for accommodating the adhesive 46 overflowing from the container portions as shown in FIG. And a plurality of container portions 34 and a plurality of receiving portions 36 are integrally formed. The outer peripheral portion 52 of the protective case 30 forms a part of the side wall 38 of the container part 34 and also forms a part of the side wall of the receiving part 36. The side wall 38 of the container portion 34 that separates the container portion 34 from the receiving portion 36 is set lower than the outer peripheral portion 52 because the adhesive 46 overflowing from the container portion 34 moves to the receiving portion 36. . The bottom wall 40 of the container part 34 and the bottom wall 42 of the receiving part 36 are formed integrally and have the same thickness and flat surface. Hereinafter, it is referred to as the bottom wall 40 when there is no particular need to distinguish it. Note that the bottom wall 40 of the container portion and the bottom wall 42 of the receiving portion 36 may have a different thickness and a different plane, that is, a step, instead of the same thickness and the same plane. The protective case 30 is mainly made of an insulating material such as an organic material such as resin or rubber, or an inorganic material such as ceramic or glass. Two coupling portions 26 where the power line 24 and the bus bar 22 are joined, and two coupling portions 26 where the two bus bars 22 are joined are shown. These coupling portions 26 are housed inside a container portion 34 including an outer peripheral portion 52, a side wall 38, and a bottom wall 40 of the protective case 30.

  FIG. 5 shows one container section 34 including a cylindrical side wall 38 and a bottom wall 40. On the inner peripheral surface of the side wall 38, a plurality of linear grooves 48 are formed by serration. The serration processing is used to reinforce the adhesiveness of the adhesive 46 filled in the container 34 to the container 38. The groove 48 may be formed not only on the inner peripheral surface of the side wall 38 of the container portion 34 but also on the inner surface of the bottom wall 40. Although the groove formed in the inner peripheral surface of the side wall 38 is shown in a rectangular cross section, the groove is not particularly rectangular and may have a V-shaped or U-shaped cross section, for example. Further, in place of the groove 48, a process of increasing the surface area on at least the inner surface of the side wall 38 or the bottom wall 40 of the container portion, for example, a process of forming irregularities on the inner surface of the container portion 34 may be performed.

  FIG. 6 shows an example of the structure of another example of the protective case 31 including three container portions 34 along one direction. The protective case 31 is provided between the three container portions 34 for accommodating the coupling portions 26 and the adjacent container portions 34 for accommodating the uncured adhesive 46 overflowing from the container portions 34. The plurality of container portions 34 and the plurality of receiving portions 36 are integrally formed. The outer peripheral portion 52 of the protective case 31 forms a part of the side wall 38 of the container part 34 and also forms a part of the side wall of the receiving part 36. A part of the outer peripheral portion 52 has a cut 54, the height of which is lower than the other outer peripheral portion 52, and the height of the cut 54 is substantially the same as the height of the side wall 40 of the container 34 in contact with the receiving portion 36. Has become. A receiving portion 36 is provided between the outer peripheral portion 52 below the cut 54 and the side wall 40. At a substantially center in the width direction of the protective case 31, there is provided a connecting portion 56 for connecting the adjacent container portions 34 to each other, and the container portion 56 generated when vibration is applied to the connecting portion 26. It has the function of suppressing vibration. The plurality of grooves 48 formed in the side wall 38 surrounding the container part 34 and the inner peripheral surface of the outer peripheral part 52 are continuous up to the end of the protective case 31 on the opening side.

  According to the present embodiment, the stator core 12, the plurality of conductors 28 wound around the stator core 12 and forming the power line 24, and the plurality of coupling portions 26 to which the plurality of conductors 28 are electrically connected And a container portion 34 including a side wall 38 and a bottom wall 40 and accommodating the plurality of coupling portions 26, respectively, and the container portion 34 is filled in the stator 10 of the rotating electric machine. Protective cases 30 and 31 which integrally include an adhesive 46 for fixing the coupling portion 26 accommodated in the container portion and a receiving portion 36 for receiving the uncured adhesive 46 overflowing from the container portion 34. Accordingly, by filling the space between the joint portion 26 of the conductor 28 and the container portion 34 with the adhesive 46, excessive vibration stress, in particular, a direction in which the two joined conductors 28 are opened with respect to the joint 26. Even when vibrations are applied, damage caused by such vibration stress can be suppressed. Further, when the uncured adhesive 46 overflows and is filled from the container portion 34 disposed so as to surround the joint portion 26, it flows out to the receiving portion 36 formed around the container portion 34, The height of the adhesive 46 covering the joint 26 is kept uniform. Thereby, it is possible to keep the suppression of vibration by the adhesive 46 uniform.

  According to the present embodiment, a plurality of grooves 48 are formed at a plurality of positions in the circumferential direction on the inner peripheral surface of the side wall 38 constituting the container portion 34. Thereby, detachment of the adhesive 46 from the container portion 34 is suppressed.

  Further, according to this embodiment, the plurality of container portions 34 and the receiving portions 36 are formed integrally. Thereby, the number of parts can be reduced.

  According to the present embodiment, the adhesive 46 is a resin material. This suppresses damage due to excessive stress in the joints 26, and further improves the insulation between the adjacent joints 26.

  In the above-described embodiment, the coupling portion 26 is an electrical junction between the bus bar 22 and the power line 24, but is not particularly limited to this. For example, a protective case including a container part 34 and a receiving part 36 at the coil end 20 that is inserted into the slot 14 of the stator core 12 and welded at the end protruding from the slot 14 to the outside of the stator core 12, that is, the coupling part 26. The bonding portion 26 surrounded by the container portion 34 may be filled with the adhesive 46.

  Next, another embodiment of the present invention will be described. In the following description, portions common to the embodiments are denoted by the same reference numerals, and description thereof is omitted.

  The present embodiment is different in that a conductive material is used instead of the resin material for the adhesive 46.

  FIG. 3 schematically shows a state in which the joining portion 26 in which the bus bar 22 and the power line 24 are joined by welding is inserted into the adhesive 46. In the present embodiment, a low melting point such as a conductive paste in which powder of a conductive material such as copper is dispersed in an adhesive or the like, a brazing material which melts a metal, and a solder material is added to the adhesive 46 shown in FIG. Metals can be used.

  According to this embodiment, the adhesive 46 is a conductive material. Thus, damage due to excessive stress in the joint 26 is suppressed, and the conductivity of the joint 26 is improved. In particular, when the adhesive 46 is made of a low-melting metal such as a brazing material, the space between the conductive wires 28 is firmly bonded even with the low-melting metal, and the damage is further suppressed.

  This embodiment is different from the above-described embodiment in that the bottom walls 40 of the protective cases 30 and 31 have a bottom wall opening 50 shown in FIG.

  FIG. 7 shows a hardening process in which the connection portion 26 between the power line 24 and the bus bar 22 is accommodated in the container portion 34 of the protection cases 30 and 31 and is fixed to the protection cases 30 and 31 by the adhesive 46. It is shown. After the stator core 12 is installed in the vehicle, if the connecting portion 26 is located above the stator core 12 and does not have the bottom wall opening 50 for inserting the connecting portion 26 into the bottom wall 40 of the container portion 34, the container of the adhesive 46 In order to suppress leakage from the portion 34, the stator core 12 is turned over, the container portion 34 is assembled to the connecting portion 26, and after the viscosity of the adhesive 46 increases, the stator core 12 is turned over again to Installation had to be done.

  In FIG. 8, the protective cases 30 and 31 have a bottom wall opening 50 in the bottom wall 40. The bottom wall opening 50 is large enough to allow the coupling portion 26 between the power line 24 and the bus bar 22 to pass therethrough, and the bottom wall opening 50 after the coupling portion 26 between the power line 24 and the bus bar 22 has penetrated. The dimension is set to such a size that the adhesive 46 made of a resin material or a conductive material does not leak out from the gap between the power line 50 and the power line 24 and the bus bar 22. Further, when the bottom wall 40 of the protective cases 30 and 31 is made to pass through the connecting portion 26 as a material for forming the bottom wall 40, the bottom wall opening 50 can be enlarged by using a material such as a resin or a rubber, for example. It is also possible to suppress that 46 leaks out.

  According to this embodiment, the same effects as those of the above-described embodiment can be expected, and the bottom wall opening 50 into which the coupling portion 26 is inserted is provided in the bottom wall 40 of the container portion 34. Accordingly, when the connecting portion 26 is located above the stator core 12 and the bottom wall 40 of the container portion 34 does not have the bottom wall opening 50 for inserting the connecting portion 26 after the stator core 12 is installed on the vehicle, the adhesive In order to suppress the leakage of the container core 34 from the container 34, the stator core 12 is inverted, the container 34 is assembled to the coupling part 26, and after the viscosity of the adhesive 46 increases, the stator core 12 is inverted again to cure the adhesive 46. It had to be installed on the vehicle. By providing the bottom wall opening 50 in the bottom wall 40 of the container part 34, the necessity of reversing the stator core 12 is eliminated, and the assembly of the container part 34 becomes easy.

  In FIGS. 5 and 6 of the above-described embodiment, the side wall 38 forming the container portion 34 is shown as a cylindrical shape having a circular cross-sectional shape. The shape may be an ellipse, a polygon including a triangle, or the like.

  In the above-described embodiment, the connecting portion 26 is formed by welding a plurality of conductive wires 28, but is not particularly limited to welding. For example, the container portion 34 and the adhesive 46 in the above-described embodiment can also be used in the connecting portion 26 where the plurality of conductive wires 28 are electrically connected by crimping using a crimping member.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the present invention is applicable to other aspects. The above is merely an embodiment, and the present invention can be implemented in various modified and improved aspects based on the knowledge of those skilled in the art.

10: Stator (rotary electric machine stator)
12: stator core 24: power line 26: coupling part 28: conducting wire 30, 31: protective case 34: container part 36: receiving part 38: side wall 40: bottom wall 46: adhesive 48: groove 50: bottom wall opening (opening)

Claims (6)

A stator for a rotating electric machine comprising: a stator core; a plurality of conductors wound around the stator core and forming a power line; and a plurality of coupling portions electrically connected to the plurality of conductors. hand,
A container part comprising a side wall and a bottom wall, each housing the plurality of joints, an adhesive filled in the container part and fixing the joint part housed in the container part, and overflowing from the container part A protective case integrally having a receiving portion for receiving the adhesive in an uncured state,
A stator for a rotating electric machine, comprising: The stator for a rotating electric machine according to claim 1, wherein a plurality of grooves are formed at a plurality of positions in a circumferential direction on an inner peripheral surface of a side wall constituting the container portion. The stator for a rotary electric machine according to claim 1 or 2, wherein the plurality of container portions and the receiving portion are formed integrally. The stator according to any one of claims 1 to 3, wherein the adhesive is a resin material. The stator according to any one of claims 1 to 3, wherein the adhesive is a conductive material. The stator for a rotating electric machine according to any one of claims 1 to 3, wherein an opening through which the coupling portion is inserted is provided in a bottom wall of the container portion.

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