JP6068018B2 - stator - Google Patents

Description

  The present invention relates to a stator of an electric motor, and more particularly to a technique for fixing an end portion of a stator winding.

The electric motor includes a stator having a stator core and a stator winding, and a rotor. The stator core includes, for example, an annular yoke extending along the circumferential direction when viewed in a cross section perpendicular to the axial direction, and a plurality of stator cores protruding radially inward from the yoke and spaced apart in the circumferential direction. Have teeth. Each tooth has a tooth base extending in the radial direction and a tooth tip provided at the tip of the tooth base and extending in the circumferential direction. The rotor is rotatably supported in a state where there is a gap between the rotor and the tooth tip.
As a method of winding the stator winding around the teeth, a concentrated winding method or a distributed winding method is used. When the stator winding is wound around the teeth by the concentrated winding method, end insulating members are provided on both sides in the axial direction of the stator core. Then, the stator winding is wound directly around the end insulating member and the teeth. In this case, it is necessary to fix the end of the stator winding, particularly the end forming the neutral point, so as not to move due to vibration or the like.
In order to prevent the end of the stator winding from moving, Patent Document 1 discloses a stator using a housing member. In the stator disclosed in Patent Document 1, the end portion of the stator winding is disposed in a housing space formed by the end insulating member and the housing member.

JP 2010-45951 A

In the stator disclosed in Patent Document 1, the movement of the end portion of the stator winding to the outside of the housing space formed by the end insulating member and the housing member is prevented. However, it is possible to move the end of the stator winding within the accommodation space. In particular, the end connected to a common point such as a neutral point can freely move at the tip. For this reason, there is a possibility that insulation failure occurs at the end of the stator winding.
The present invention has been made in view of such a point, and an object thereof is to provide a technique capable of reliably fixing one end of a stator winding.

  The present invention is configured as follows. The “axial direction” indicates a direction of a line (rotation center line) passing through the center of the rotor in a state where the rotor is rotatably supported with respect to the stator. In addition, the “circumferential direction” indicates a circumferential direction centered on the rotation center line when viewed in a cross section perpendicular to the axial direction in a state where the rotor is rotatably supported with respect to the stator. The “radial direction” indicates a direction passing through the rotation center line when viewed in a cross section perpendicular to the axial direction in a state where the rotor is rotatably supported with respect to the stator.

One invention relates to a stator. The stator according to the present invention includes a stator core having end faces on both sides in the axial direction, and end portions formed of a resin provided at positions facing the end faces of the stator core on both sides in the axial direction of the stator core. An insulating member and a stator winding wound around the stator core and the end insulating member are provided. Each end insulating member has an inner wall member extending along the circumferential direction when viewed in a cross section perpendicular to the axial direction, and an outer wall disposed radially outside the inner wall member and extending along the circumferential direction. The member extends along the radial direction, and has a connecting member that connects the inner wall member and the outer wall member. Typically, the outer wall member is disposed at a position facing the yoke of the stator core, the inner wall member is disposed at a position facing the tooth tip of the teeth of the stator core, and the connecting member is disposed at the stator core. It arrange | positions in the position which opposes the teeth base of teeth. The stator winding is wound around the connecting member between the teeth of the stator core (the teeth base) and the end insulating member so that the stator core and the end insulating member are integrated by a concentrated winding method.
In the stator according to the present invention, at least one of the end insulating members has an accommodation space for accommodating one end of the stator winding on the radially outer side from the outer wall member. The accommodation space opens along the axial direction on the side opposite to the end face of the stator core and extends along the circumferential direction. The accommodation space is formed by a bottom wall surface provided on the opposite side of the opening along the axial direction, and a plurality of side wall surfaces extending from the bottom wall surface to the opposite side of the end surface of the stator core along the axial direction. Yes. The plurality of side wall surfaces include the outer peripheral surface of the outer wall member.
Then, one end of the stator winding is housed in the housing space in a state where movement in the housing space is prevented. One end of the stator winding corresponds to an end that is easily moved by vibration or the like, typically an end that forms a neutral point. In the present invention, a part of the outer peripheral surface of the outer wall member corresponding to the accommodation space is recessed so that a recess is formed, and one end of the stator winding is accommodated in the accommodation space. In the state, the accommodation space is filled with resin. The shape of the recesses, the positions where the recesses are formed, the number of recesses, and the like are set so that the resin filled in the storage space is prevented from coming out of the opening of the storage space.
In the present invention, one end of the stator winding can be reliably fixed. In addition, when the end insulating member having the accommodation space is integrally formed with resin, it is possible to easily form a recess for suppressing the resin from coming out of the accommodation space.

Another invention relates to a stator. The stator according to the present invention includes a stator core having end faces on both sides in the axial direction, and end portions formed of a resin provided at positions facing the end faces of the stator core on both sides in the axial direction of the stator core. An insulating member and a stator winding wound around the stator core and the end insulating member are provided. Each end insulating member has an inner wall member extending along the circumferential direction when viewed in a cross section perpendicular to the axial direction, and an outer wall disposed radially outside the inner wall member and extending along the circumferential direction. The member extends along the radial direction, and has a connecting member that connects the inner wall member and the outer wall member.
In the stator according to the present invention, at least one of the end insulating members has an accommodation space for accommodating one end of the stator winding on the radially outer side from the outer wall member. The accommodation space opens along the axial direction on the side opposite to the end face of the stator core and extends along the circumferential direction. The accommodating space is formed by a bottom wall surface provided on the opposite side of the opening along the axial direction, and a plurality of side wall surfaces extending in the opposite direction from the end wall surface of the stator core along the axial direction. Yes. The plurality of side wall surfaces are spaced apart from the outer peripheral surface of the outer wall member and the peripheral wall surface that is disposed outside the outer peripheral surface of the outer wall member along the radial direction and extends along the circumferential direction. An end wall surface disposed at a position and extending in the radial direction between the outer peripheral surface and the peripheral wall surface of the outer wall member is included.
Then, one end of the stator winding is housed in the housing space in a state where movement in the housing space is prevented. In the present invention, the extending member extending along the radial direction from at least one of the location corresponding to the accommodation space and the peripheral wall surface of the outer peripheral surface of the outer wall member is provided at a position away from the bottom wall surface, and fixed. The housing space is filled with resin in a state where one end of the child winding is passed between the bottom wall surface and the extending member. Only one end of the extending member may be connected to one of the outer wall surface of the outer wall member corresponding to the accommodation space and one of the peripheral wall surfaces, or both end portions of the outer wall surface of the outer wall member. The part corresponding to the accommodation space and the peripheral wall surface may be connected.
In the present invention, the extension member suppresses the resin filled in the accommodation space from slipping out of the accommodation space, so that one end of the stator winding can be reliably fixed.

In the different form of this invention , the extension member is connected to the location corresponding to the accommodation space and the peripheral wall surface of the outer peripheral surface of the outer wall member, and is configured as a bridge.
In this embodiment, the end insulating member having the extending member can be easily integrally formed with resin.

Still another invention relates to an electric motor including any one of the stators described above.
In the electric motor of the present invention, one end of the stator winding can be reliably fixed.

  By using the stator and the electric motor of the present invention, one end of the stator winding can be reliably fixed.

1 is a perspective view of a stator (electric motor) of a first embodiment (a case is not shown). FIG. 3 is a front view of the stator (electric motor) according to the first embodiment (the case is not shown). It is a fragmentary sectional view of a stator core. FIG. 4 is a view (case is shown) seen from the direction of arrow IV in FIG. 2. FIG. 5 is a sectional view taken along line VV in FIG. 2 (a case is illustrated). It is the perspective view which looked at the edge part insulation member used with the stator (electric motor) of 1st Embodiment from the one side along the axial direction. It is the perspective view which looked at the edge part insulation member used with the stator (electric motor) of 1st Embodiment from the other side along the axial direction. It is a perspective view of the accommodation space formation member of the stator (electric motor) of a 1st embodiment. It is the IX-IX sectional view taken on the line of FIG. It is the XX sectional view taken on the line of FIG. It is the perspective view which looked at the edge part insulation member used with the stator (electric motor) of 2nd Embodiment from the one side along an axial direction. It is a perspective view of the accommodation space formation member of the stator (electric motor) of a 2nd embodiment. It is the XIII-XIII sectional view taken on the line of FIG. It is the perspective view which looked at the edge part insulation member used with the stator (electric motor) of 3rd Embodiment from the one side along the axial direction. It is a perspective view of the accommodation space formation member of the stator (electric motor) of a 3rd embodiment. It is the XVI-XVI sectional view taken on the line of FIG. It is the perspective view which looked at the edge part insulation member used with the stator (electric motor) of 4th Embodiment from the one side along the axial direction. It is a perspective view of the accommodation space formation member of the stator (electric motor) of a 4th embodiment. It is the XIX-XIX sectional view taken on the line of FIG. It is the XX-XX sectional view taken on the line of FIG.

Embodiments of the present invention will be described below with reference to the drawings.
A stator 10 of an electric motor according to a first embodiment will be described with reference to FIGS. FIG. 1 is a perspective view of the stator 10 of the electric motor according to the first embodiment, and FIG. 2 is a front view of the stator 10. FIG. 3 is a partial cross-sectional view of the stator core 10. 4 is a view (plan view) seen from the direction of arrow IV in FIG. 2, and FIG. 5 is a cross-sectional view taken along line VV in FIG. 4 and 5, the case 70 is illustrated on the outer peripheral side of the stator core 20, but the case 70 is not illustrated in FIGS. 1 and 2.
In this specification, the “axial direction” means a line passing through the center of the rotor (rotation center line P shown in FIG. 1) in a state where the rotor is rotatably supported with respect to the stator 10. Indicates the direction. The “circumferential direction” is centered on the rotation center line P when viewed in a cross section perpendicular to the axial direction (direction of the rotation center line P) in a state where the rotor is rotatably supported with respect to the stator 10. Indicates the circumferential direction. The “radial direction” refers to a cross section perpendicular to the axial direction (the direction of the rotation center line P) when the rotor is rotatably supported with respect to the stator 10, and passes through the rotation center line P. Indicates direction.

The electric motor according to the present embodiment includes a stator 10 and a rotor (not shown).
The stator 10 has a stator core 20, end insulating members 30 and 50, and a stator winding 60.
The stator core 20 is composed of a laminated body in which a plurality of thin electromagnetic steel plates are laminated in the axial direction and integrated by an auto clamp or the like, and has a cylindrical shape (substantially cylindrical shape) having end faces 20A and 20B on both sides in the axial direction. Including). As shown in FIG. 3, the stator core 20 has a yoke 21 extending along the circumferential direction when viewed in a cross section perpendicular to the axial direction, and a diameter from the yoke 21 spaced apart in the circumferential direction. A plurality of teeth 22 extending inward in the direction (rotation center line P side) is provided. The yoke 21 is formed in an annular shape (including a substantially annular shape). Each tooth 22 has a teeth base portion 22a extending radially inward from the yoke 21 and a teeth tip portion 22b provided on the tip side of the teeth base portion 22a and extending in the circumferential direction. A tooth tip surface 22 c is formed on the tooth tip 22 b on the side opposite to the yoke 21. The teeth tip surface 22c is formed in an arc shape centered on the rotation center line P.
In the present embodiment, the rotor has a gap (gap) between the outer peripheral surface of the rotor and the tooth tip surface 22c in the rotor housing space formed by the tooth tip surface 22c. It is rotatably supported.
A slot 23 is formed by two teeth 22 adjacent to the yoke 21 in the circumferential direction. The slot 23 has a slot opening 23a between the tooth tips 22b of two teeth 22 adjacent in the circumferential direction.
A slot insulating member 25 is provided in the slot 23. Then, the stator winding 60 is inserted into the slot 23 in a state where the slot insulating member 25 is disposed.
An interphase insulating member 26 is inserted in the slot 23 in order to insulate between the stator windings 60 adjacent in the circumferential direction. In the present embodiment, the interphase insulating member 26 is formed by bending a sheet-like insulating member, and has a V shape (including a substantially V shape) when viewed in a cross section perpendicular to the axial direction.

The end insulating members 30 and 50 are provided on both sides in the axial direction of the stator core 20 at positions facing the end surfaces 20A and 20B. In FIG. 1 and FIG. 2, the end insulating member 50 is illustrated in a simplified manner. However, in the present embodiment, the end insulating members 30 and 50 have the same configuration. The configuration of 30 will be described.
As shown in FIGS. 6 and 7, the end insulating member 30 has a plurality of inner wall members 31 extending in the circumferential direction when viewed in a cross section perpendicular to the axial direction, and a diameter larger than the inner wall member 31. The outer wall member 32 is arranged on the outer side in the direction and extends along the circumferential direction, and has a plurality of connecting members 33 that extend along the radial direction and connect the inner wall member 31 and the outer wall member 32. The inner wall member 31 and the outer wall member 32 extend along the axial direction (in a wall shape).
The convex portion 35 formed on the bottom surface 30A of the end insulating member 30 is a positioning member for disposing the end insulating member 30 at a predetermined position on the end surface 20A or 20B of the stator core 20, and the stator. The core 20 is configured to be engageable with a recess (not shown) formed in the end surface 20A or 20B of the core 20. The inner wall member 31 in a state where the end insulating member 30 is disposed on one side in the axial direction of the stator core 20 (a state where the end surface 30A of the end insulating member 30 is in contact with the end surface 20A or 20B of the stator core 20). Is disposed at a position facing the tooth tip 22b of the tooth 22, the outer wall member 32 is disposed at a position facing the yoke 21, and the connecting member 33 is disposed at a position facing the tooth base 22a of the tooth 22. The
In addition, in a state where the end insulating member 30 is arranged on one side in the axial direction of the stator core 20, the inner peripheral surface (the rotor side surface) of the inner wall member 31 protrudes from the teeth tip surface 22c to the rotor side. It is preferable to configure so as not to exist. The connecting member 33 of the end insulating member 30 is used when the stator winding 60 is wound around the teeth 22 by a concentrated winding method.

Here, the stator winding 60 directly wound around the connecting member 33 of the tooth 22 and the end insulating member 30 (50) has one end and the other end. Each end of the stator winding 60 is processed according to the method of connecting the stator winding 60. For example, in the case of star connection, one end of a three-phase (U-phase, V-phase, W-phase) stator winding 60 is connected in common to form a neutral point, and the other end The part is pulled out for connection to an external power source. In the present embodiment, three star-connected stator windings 60 are connected in parallel. 1 and 4, one end portions 61 (1) to 61 (3) of the stator winding 60 are respectively of a U phase, a V phase, and a W phase that form a neutral point. The one end of the stator winding 60 is bundled for each star connection. One end 61 (1) to 61 (3) of the stator winding 60 that forms a neutral point is usually covered with a connection point protection member. Although not shown in FIGS. 1 and 4, at the other end of the stator winding 60, three stator windings 60 of U phase, V phase, and W phase are bundled for each phase. Withdrawn outside.
One end 61 (1) to 61 (3) of the stator winding 60 corresponds to “one end of the stator winding housed in the housing member” of the present invention.
The method of connecting the stator windings 60, the number of stator windings 60 connected in parallel, and the like can be selected as appropriate.

In addition, the end insulating member 30 is provided with a storage space forming member 40 that forms a storage space 40 a that stores one end 61 (1) to 61 (3) of the stator winding 60. The configuration of the accommodation space forming member 40 is shown in FIGS. 8 is a perspective view of the accommodation space forming member 40, FIG. 9 is a sectional view taken along line IX-IX in FIG. 8, and FIG. 10 is a sectional view taken along line XX in FIG.
In the present embodiment, the accommodation space 40 a is formed by the outer wall member 32 and the accommodation space forming member 40 provided on the outer side in the radial direction from the outer wall member 32. The accommodation space 40a has an opening 40C on the side opposite to the end surface 20A (20B) of the stator core 20 along the axial direction (the side opposite to the end surface of the stator core 20 opens), and extends along the circumferential direction. Yes.
The housing space forming member 40 includes end wall members 41 and 42, a peripheral wall member 43, and a bottom wall member 44. The bottom wall member 44 is provided in parallel to the end surface 20A (20B) of the stator core 20 (including "substantially parallel") at a position facing the end surface 20A (20B) of the stator core 20. The peripheral wall member 43 extends outward in the radial direction from the outer wall member 32, along the circumferential direction (in parallel with the outer wall member 32 (including “substantially parallel”)), and from the bottom wall member 44 in the axial direction. Is extended in the direction opposite to the end face 20A (20B) of the stator core 20 along the direction. The end wall members 41 and 42 extend from the bottom wall member 44 in the opposite direction to the end surface 20A (20B) of the stator core 20 along the axial direction at positions separated from each other along the circumferential direction. 32 and the peripheral wall member 43 extend along the radial direction. That is, the accommodating space 40a is formed with the outer peripheral surface 32a of the outer wall member 32, the bottom wall surface 44a of the bottom wall member 44, the peripheral wall surface 43a of the peripheral wall member 43, and the end wall surfaces of the end wall members 41 and 42 as wall surfaces.
In the present embodiment, the outer peripheral surface 32a of the outer wall member 32 extending along the axial direction, the peripheral wall surface 43a of the peripheral wall member 43, and the end wall surfaces of the end wall members 41 and 42 form the “accommodating space” of the present invention. It corresponds to “a plurality of side wall surfaces”.

The outer wall member 32 is formed with a groove 34 for passing one end 61 (1) of the stator winding 60 wound around the tooth 22 into the accommodation space 40 a. One end 61 (1) of the stator winding 60 is accommodated in the accommodating space 40 a via the groove 34. At this time, one end 61 (1) of the stator winding 60 is accommodated in the accommodating space 40a in a state where movement in the accommodating space 40a is blocked.
In the present embodiment, one end of the stator winding 60 is filled with resin in a state in which one end 61 (1) of the stator winding 60 is accommodated in the accommodation space 40 a. The movement of the end 61 (1) in the accommodation space 40a is prevented.

Here, there is a possibility that the resin filled in the accommodation space 40a may come out of the accommodation space 40a from the opening 40C along the axial direction. When the resin escapes from the accommodation space 40a, the one end 61 (1) of the stator winding 60 also escapes from the accommodation space 40a together with the resin.
When the opening 40C is provided on the opposite side of the end surface 20A (20B) of the stator core 20 along the axial direction, an external force along the axial direction needs to be applied to the resin in order for the resin to escape from the opening 40C. There is. For this reason, it is possible to prevent the resin from coming out of the opening 40C by restricting the force along the axial direction from being applied to the resin. As a method for restricting the application of a force along the axial direction to the resin, a method of providing a recess for forming a recess in a wall surface extending along the axial direction among the wall surfaces forming the accommodation space 40a is considered. It is done.
In the present embodiment, a recess (notch) 40 b is provided in the outer peripheral surface 32 a of the outer wall member 32 by forming a notch surface 32 b in the outer peripheral surface 32 a of the outer wall member 32. The shape, position, and number of the cutout surface 32b (concave portion 40b) are aligned with the resin filled in the accommodation space 40a when a force in the direction of coming out of the opening 40C along the axial direction is applied to the resin. The force is set so as to be canceled by the notch surface 32b that comes into contact with the resin.

In the present embodiment, the accommodation space forming member 40 is integrally formed with resin together with the end insulating member 30.
Here, by forming the resin integrally, in order to form the notch surface 32b at the location corresponding to the accommodation space 40a on the outer peripheral surface 32a of the outer wall member 32, the mold for forming the notch surface 32b is inclined. Need to be placed. In the present embodiment, as shown in FIGS. 8 and 9, the mold is disposed obliquely from the peripheral wall member 43 side at a position corresponding to the accommodation space 40 a on the outer peripheral surface 32 a of the outer wall member 32. ing. Thereby, it can shape | mold easily compared with the case where a notch surface (concave part) is formed in the surrounding wall surface 43a of the surrounding wall member 43. FIG.
The peripheral wall surface 43b and the bottom wall surface 44b shown in FIGS. 8 and 9 are formed by using such a mold.
As a method of forming the notch surface 32b (recess 40b) on the outer peripheral surface 32a of the outer wall member 32, other methods can be used.

In the first embodiment, the cutout surface 32 b (recess 40 b ) that prevents the resin from coming out of the opening 40 C of the accommodation space 40 a is formed on the outer peripheral surface 32 a of the outer wall member 32, but the peripheral wall surface 43 a of the peripheral wall member 43. It is also possible to form a notch surface (concave portion). In addition, a notch surface (concave portion) can be formed on the end wall surface of the end wall member 41 or 42. A second embodiment in which a notch surface (concave portion) is formed on the end wall surface of the end wall member will be described with reference to FIGS.
FIG. 11 is a perspective view of the end insulating member 130 used in the electric motor (stator) according to the second embodiment, viewed from one side along the axial direction. 12 is a perspective view of the accommodation space forming member 140, and FIG. 13 is a cross-sectional view taken along line XIII-XIII in FIG.

The end insulating member 130 includes an inner wall member 131, an outer wall member 132, and a connecting member 133, similarly to the end insulating member 30 of the first embodiment.
Further, the accommodation space 140a for accommodating one end 61 (1) of the stator winding 60 is the outer wall member 132 and the outer side in the radial direction from the outer wall member 132, similarly to the accommodation space 40a of the first embodiment. And is formed by a housing space forming member 140 having end wall members 141 and 142, a peripheral wall member 143, and a bottom wall member 144. The accommodation space 140a has an opening 140C on the side opposite to the end surface 20A (20B) of the stator core 20 along the axial direction (the side opposite to the stator core 20 opens), and extends along the circumferential direction.

The present embodiment is different from the first embodiment in that a notch surface (concave portion) is formed on the end wall surface of the end wall member 141. In the present embodiment, as shown in FIG. 13, the end wall surface of the end wall member 141 on one side along the circumferential direction is along the circumferential direction of the opening 140 </ b> C as seen in a cross section along the circumferential direction. From one end 140C1, it has notch surfaces 141a, 141b, 141c that form a recess 140b that is recessed in one direction along the circumferential direction. Moreover, the notch surface 141a arrange | positioned among the notch surfaces 141a, 141b, and 141c on the opposite side to end surface 20A (20B) of the stator core 20 along the axial direction inclines. The inclination direction of the notch surface 141a is such that the distance from the end surface 20A (20B) of the stator core 20 increases as the distance from the one end portion 140C1 along the circumferential direction of the opening 140C increases in one direction along the circumferential direction. It is set to be shorter. Accordingly, one end 61 (1) of the stator winding 60 that has passed through the groove 134 formed in the outer wall member 132 is inserted into the accommodating space 140a from the opening 140C, so that one end of the stator winding 60 is obtained. The end portion 61 (1) is accommodated in the recess 140b.
In the present embodiment, the end wall surface 142a of the other end wall member 142 along the circumferential direction is inclined so that a convex portion is formed. The inclination direction of the end wall surface 142a is closer to the end surface 20A (20B) of the stator core 20 as the opening 140C moves away from the other end portion 140C2 along the circumferential direction toward one direction along the circumferential direction. The distance is set to be short. Thereby, it becomes easier to insert the one end 61 (1) of the stator winding 60 into the recess 140b.
The housing space 140a is filled with resin in a state where one end 61 (1) of the stator winding 60 is inserted into the recess 140b in the housing space 140a.
In the present embodiment, the resin filled in the accommodation space 140a comes into contact with the notch surface 141a, thereby preventing the resin from coming out of the opening 140A of the accommodation space 140a.

Another embodiment (third embodiment) in which a notch surface (concave portion) is formed on the end wall surface of the end wall member of the accommodation space forming member will be described with reference to FIGS. 14 to 16.
FIG. 14 is a perspective view of the end insulating member 230 used in the electric motor (stator) according to the third embodiment as viewed from one side along the axial direction. 15 is a perspective view of the accommodation space forming member 240, and FIG. 16 is a cross-sectional view taken along line XVI-XVI of FIG.
The end insulating member 230 includes an inner wall member 231, an outer wall member 232, and a connecting member 233, similarly to the end insulating member 30 of the first embodiment.
The accommodation space 240a for accommodating one end 61 (1) of the stator winding 60 is the outer wall member 232 and the outer side in the radial direction from the outer wall member 232 in the same manner as the accommodation space 40a of the first embodiment. The housing space forming member 240 includes end wall members 241 and 242, a peripheral wall member 243, and a bottom wall member 244. The accommodation space 240a has an opening 240C on the side opposite to the end surface 20A (20B) of the stator core 20 along the axial direction (the side opposite to the stator core 20 opens), and extends along the circumferential direction.

In the present embodiment, as shown in FIG. 16, the end wall surface 241 a of the end wall member 241 on one side along the circumferential direction is one direction along the circumferential direction as viewed in a cross section along the circumferential direction. It has notch surfaces 241b, 241c, and 241d that form recesses 240b that are recessed in the surface.
The housing space 140a is filled with resin in a state where one end 61 (1) of the stator winding 60 is inserted into the recess 240b in the housing space 240a.
The hole 246 formed in the end wall member 242 is formed by arranging a mold for forming the recess 240b when the end insulating member 230 having the accommodating space forming member 240 is integrally formed with resin. Is formed.
In the present embodiment, the resin filled in the accommodation space 240a abuts on the cut surface 241b forming the recess 240b, thereby preventing the resin from coming out of the opening 240C of the accommodation space 240a.

In the first to third embodiments, by forming a notch surface (concave portion) on at least one of the side wall surfaces extending in the axial direction among the wall surfaces forming the accommodation space, Resin that has been prevented from coming out of the opening of the accommodation space, but has been filled in the accommodation space by providing an extension member extending along the direction intersecting the axial direction in the accommodation space. Can be prevented from coming out of the opening of the accommodation space.
An electric motor (stator) according to a fourth embodiment will be described with reference to FIGS. FIG. 17 is a perspective view of the end insulating member 330 used in the electric motor (stator) according to the fourth embodiment, viewed from one side along the axial direction. 18 is a perspective view of the accommodation space forming member 340, FIG. 19 is a cross-sectional view taken along line XIX-XIX in FIG. 18, and FIG. 20 is a cross-sectional view taken along line XX-XX in FIG.

The end insulating member 330 includes an inner wall member 331, an outer wall member 332, and a connecting member 333, similarly to the end insulating member 30 of the first embodiment.
The accommodation space 340a that accommodates one end 61 (1) of the stator winding 60 is radially outer than the outer wall member 332 and the outer wall member 332 in the same manner as the accommodation space 40a of the first embodiment. The housing space forming member 340 includes end wall members 341 and 342, a peripheral wall member 343, and a bottom wall member 344. The accommodation space 340a has an opening 340C on the side opposite to the end face 20A (20B) of the stator core 20 along the axial direction (the side opposite to the stator core 20 opens), and extends along the circumferential direction.
In the present embodiment, an extending member extending in the radial direction (direction intersecting the axial direction) between the outer peripheral surface 332a of the outer wall member 332 and the peripheral wall surface 343a of the peripheral wall member 343 in the accommodation space 340a. 347 is provided. As shown in FIG. 19, the extending member 347 is formed at a position away from the bottom wall surface 344a, that is, at a position where a space is formed between the bottom wall surface 344a and the extending member 347.
The housing space 340a is filled with resin in a state where one end 61 (1) of the stator winding 60 is passed through the space between the bottom wall surface 344a and the extending member 347.
The hole 348 formed in the peripheral wall member 343 forms a space between the bottom wall surface 344a and the extending member 347 when the end insulating member 330 having the accommodation space forming member 340 is integrally formed with resin. It is formed by arranging metal fittings to do.
In the present embodiment, the resin filled in the accommodation space 340a comes into contact with the extending member 347, thereby preventing the resin from coming out of the opening 340C of the accommodation space 340a. Further, one end 61 (1) of the stator winding 60 is passed between the bottom wall surface 344 a and the extending member 347, so that one end 61 (1) of the stator winding 60 is The movement can be prevented more reliably.

In the fourth embodiment, both ends of the extending member 347 extending along the radial direction are connected to the outer peripheral surface 332a of the outer wall member 332 and the peripheral wall surface 343a of the peripheral wall member 343 to form a bridge. One end of the output member 347 may be connected to the outer peripheral surface 332 a of the outer wall member 332 or the peripheral wall surface 343 a of the peripheral wall member 343. That is, at least one end of the extending member 347 only needs to be connected to the outer peripheral surface 332a of the outer wall member 332 or the peripheral wall surface 343a of the peripheral wall member 343. Even in this case, it is possible to prevent the resin filled in the accommodation space 340a from coming out of the opening 340C of the accommodation space 340a by coming into contact with the extending member 347.
Further, one end 61 (1) of the stator winding 60 is passed between the bottom wall surface 344a and the extending member 347, but can be accommodated in an appropriate location in the accommodation space 340a. Even in this case, the resin filled in the accommodation space 340a abuts on the extending member 347, so that the resin can be prevented from coming out of the opening 340C of the accommodation space 340a.
Further, although the extending member 347 is provided so as to extend along the radial direction, the extending member 347 only needs to extend along a direction intersecting the axial direction. For example, an extending member extending along the circumferential direction from at least one of the end wall surfaces of the end wall members 341 and 342 may be provided.
The shape, position, number, and the like of the extending member 347 can be changed as appropriate.

In the present embodiment, as shown in FIGS. 1 to 5, the stator core 20 has a notch surface 28 in which the outer peripheral surface is notched along the axial direction. A cutout portion 28 a extending in the axial direction is formed by the cutout surface 28 and the case 70 provided on the outer peripheral side of the stator core 20. This notch 28a is used as a cooling medium passage through which the cooling medium compressed by the compression mechanism disposed below the electric motor flows.
Here, in the compressor in which the compressor and the electric motor that drives the compression mechanism are arranged in the vertical direction (the electric motor is arranged above the compression mechanism), the cooling medium passage 28a is compressed with the cooling medium. The medium (mixed gas) containing the lubricating oil of the mechanism part flows. When the lubricating oil in the compression mechanism portion is discharged together with the cooling medium through the cooling medium passage 28a, the amount of the lubricating oil is reduced, and there is a possibility that poor lubrication of the compression mechanism portion occurs.
In the present embodiment, the accommodation space forming member 40 (140, 240, 340) is shown in FIG. 2 in order to be able to efficiently collect the lubricating oil (oil component) flowing through the cooling medium passage 28a. Arranged as shown. That is, the bottom surface (the surface facing the end surface 20A of the stator core 20) 40A of the accommodation space forming member 40 is opposed to the notch surface 28 (notch portion 28a) formed on the outer peripheral surface of the stator core 20 (upward). The housing space forming member 40 is disposed so as to be separated from the end face 20a of the stator core 20 by a set distance L.
In this case, the lubricating oil (oil component) that flows along with the cooling medium through the notch (cooling medium passage) 28 a formed on the outer peripheral side of the stator core 20 liquefies when it hits the bottom surface 40 </ b> A of the accommodation space forming member 40. And it returns to the compression mechanism part side via the notch part (cooling medium passage) 29a.
Thereby, lubricating oil can be collect | recovered efficiently.

The present invention is not limited to the configuration described in the embodiment, and various changes, additions, and deletions are possible.
The shape of the storage space or the storage space forming member can be changed as appropriate.
Although the outer wall member is used as a part of the housing space forming member, the housing space can be formed only by the housing space forming member.
Although the end insulating members having the same configuration are used as the end insulating members arranged on both sides in the axial direction of the stator core, end insulating members having different configurations can also be used. For example, the accommodation space forming member can be provided only on one end insulating member.
The present invention can be configured as a stator or an electric motor. Moreover, it can also be comprised as a compressor by which the compression mechanism part and the electric motor which drives a compression mechanism part are arrange | positioned above the compression mechanism part.

The present invention can also be configured as follows.
(Aspect 1)
A stator core having end faces on both sides in the axial direction; end insulating members provided on opposite sides of the stator core on opposite sides of the stator core; and the stator core and the end A stator winding wound around a part insulating member, each of the end insulating members being seen in a cross section perpendicular to the axial direction, an inner wall member extending along a circumferential direction, and a radial direction from the inner wall member A stator having an outer wall member disposed on the outer side and extending along a circumferential direction, and a connecting member that extends along a radial direction and connects the inner wall member and the outer wall member. At least one of the end insulating members has an accommodating space for accommodating one end of the stator winding on a radially outer side than the outer wall member, and the accommodating space is along the axial direction. And the side opposite to the end face of the stator core is open And one end of the stator winding is housed in the housing space in a state in which movement in the housing space is prevented. stator.
(Aspect 2)
In the stator according to aspect 1, a part of at least one wall surface extending in the axial direction among the wall surfaces forming the housing space is recessed so as to form a recess, and the stator winding In the state where one end of the wire is housed in the housing space, the housing space is filled with resin, and the recess fills the resin filled in the housing space through the opening of the housing space. A stator characterized by being formed so as to be suppressed.
(Aspect 3)
In the stator according to aspect 2, an outer peripheral surface of the outer wall member is included in a wall surface forming the housing space, and the outer peripheral surface of the outer wall member is recessed so as to form the concave portion. Stator characterized by.
(Aspect 4)
The stator according to aspect 2, wherein among the wall surfaces forming the housing space, at least one of the wall surfaces extending along the axial direction and spaced apart along the circumferential direction forms a recess. The stator is characterized in that the concave portion is inclined in the circumferential direction on the side opposite to the end face of the stator core along the axial direction when viewed in a cross section along the circumferential direction. .
(Aspect 5)
In the stator according to aspect 1, the wall surface forming the housing space includes a bottom wall surface provided on the opposite side of the opening along the axial direction, and the stator from the bottom wall surface along the axial direction. A plurality of side wall surfaces extending in a direction opposite to the end surface of the core are included, and at a position away from the bottom wall surface, along a direction intersecting the axial direction from at least one of the plurality of side wall surfaces An extending member extending in a lengthwise direction is provided, and the housing space is filled with resin in a state where one end of the stator winding is housed in the housing space. stator.
(Aspect 6)
The stator according to aspect 5, wherein one end of the stator winding is passed between a bottom wall surface of the housing space and the extending member.
(Aspect 7)
It is a stator of aspect 5 or 6, Comprising: Both ends of the said extending member are connected to the side wall surface, The stator characterized by the above-mentioned.
(Aspect 8)
The stator according to any one of aspects 5 to 7, wherein the extending member extends along a radial direction.
(Aspect 9)
The stator according to any one of aspects 5 to 8, wherein the outer wall surface of the outer wall member is included in a wall surface forming the accommodation space.
(Aspect 10)
An electric motor comprising the stator according to any one of aspects 1 to 9 and a rotor.

DESCRIPTION OF SYMBOLS 10 Stator 20 Stator core 21 Yoke 22 Teeth 22a Teeth base 22b Teeth tip 22c Teeth tip 23 Slot 25 Slot insulation member 26 Interphase insulation member 28 Notch surface 28a Notch (cooling medium passage)
30, 50, 130, 230, 330 End insulating members 31, 131, 231, 331 Inner wall members 30A, 130A, 230A, 330A Bottom surfaces 31a, 131a, 231a, 331a of inner end members 32, 132, 232 332 Outer wall member 32a, 132a, 232a, 332a Outer peripheral surface 32b Notch surface 33, 133, 233, 333 Connecting member 34, 134, 234, 334 Groove 35 Projection 40, 140, 240, 340 Housing space forming member 40a, 140a , 240a, 340a Housing space 40b, 140b, 240b Notch (recess)
40A, 140A, 240A, 340A Housing member bottom surface 41, 42, 141, 142, 241, 242, 341, 342 End wall member 43, 143, 243, 343 Peripheral wall member 43a, 43b, 343a Peripheral wall surface 44, 144, 244 344 Bottom wall member 44a, 144a, 244a, 344a Bottom wall surface 60 Stator winding 61 (1) to 61 (3) One end of stator winding (end forming neutral point)
70 cases (sealed containers)
141a, 141b, 141c, 241b, 241c, 241d Notch surface 142a, 241a, 242a End wall surface 246 Hole 347 Extension member 348 Hole

Claims (4)

A stator core having end faces on both axial sides;
End insulating members formed of resin, provided at positions facing the end face of the stator core on both axial sides of the stator core;
A stator winding wound around the stator core and the end insulating member;
Each of the end insulating members, as viewed in a cross section perpendicular to the axial direction, is disposed along an inner wall member extending along the circumferential direction and radially outward from the inner wall member, and extends along the circumferential direction. An outer wall member extending in the radial direction, and a stator having a connecting member that connects the inner wall member and the outer wall member,
At least one of the end insulating members has an accommodating space for accommodating one end of the stator winding on the radially outer side from the outer wall member,
The housing space has an opening on the opposite side to the end face of the stator core along the axial direction, and extends along the circumferential direction.
The housing space includes a bottom wall surface provided on the opposite side of the opening along the axial direction, and a plurality of side wall surfaces extending from the bottom wall surface along the axial direction in a direction opposite to the end surface of the stator core. Formed by
The plurality of side wall surfaces include an outer peripheral surface of the outer wall member,
A part of the outer peripheral surface of the outer wall member corresponding to the accommodation space is recessed to form a recess,
A stator in which the housing space is filled with resin in a state where one end of the stator winding is housed in the housing space . A stator core having end faces on both axial sides;
End insulating members formed of resin, provided at positions facing the end face of the stator core on both axial sides of the stator core;
A stator winding wound around the stator core and the end insulating member;
Each of the end insulating members, as viewed in a cross section perpendicular to the axial direction, is disposed along an inner wall member extending along the circumferential direction and radially outward from the inner wall member, and extends along the circumferential direction. An outer wall member extending in the radial direction, and a stator having a connecting member that connects the inner wall member and the outer wall member,
At least one of the end insulating members has an accommodating space for accommodating one end of the stator winding on the radially outer side from the outer wall member,
The housing space has an opening on the opposite side to the end face of the stator core along the axial direction, and extends along the circumferential direction.
The housing space includes a bottom wall surface provided on the opposite side of the opening along the axial direction, and a plurality of side wall surfaces extending from the bottom wall surface along the axial direction in a direction opposite to the end surface of the stator core. Formed by
The plurality of side wall surfaces include an outer peripheral surface of the outer wall member, a peripheral wall surface that is disposed outside the outer peripheral surface of the outer wall member along the radial direction, and extends along the circumferential direction. End wall surfaces that are arranged at positions separated from each other and extend along the radial direction between the outer peripheral surface of the outer wall member and the peripheral wall surface are included,
An extending member extending along the radial direction from at least one of the outer peripheral surface of the outer wall member corresponding to the housing space and the peripheral wall surface is provided at a position away from the bottom wall surface. ,
The stator is characterized in that the accommodation space is filled with resin in a state where one end portion of the stator winding is passed between the bottom wall surface and the extending member. The stator according to claim 2 ,
The extension member is connected to a portion corresponding to the accommodation space on the outer peripheral surface of the outer wall member and the peripheral wall surface at both ends. An electric motor comprising the stator according to any one of claims 1 to 3 and a rotor.

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