JP2016046941A - Rotor for rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator for a rotary electric machine provided with a stator coil, the stator for the rotary electric machine being designed to reduce damage on a connection part (joint part) between a phase coil and an output line.SOLUTION: A stator 20 for a rotary electric machine 1 according to the present invention comprises: an annular stator iron core 30; and a stator coil 40 having a plurality of phase coils 43 inserted in a slot 31 and wound around the stator iron core, and also having a plurality of output lines 45 connecting the respective ends of the phase coils 43 and an external terminal. In the stator of the rotary electric machine, the respective ends of the phase coils and the respective ends of the output lines are joined to corresponding connection terminals 44 while their extending directions are kept in parallel. Each connection terminal includes: a phase-coil joint part 44A joining the ends of the phase coils while surround them; and an output-line joint part 44B joining the ends of the output lines while surround them.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a stator of a rotating electrical machine, and more particularly to a stator of a rotating electrical machine in which a phase winding of a stator winding and an output line are joined.

  Conventionally, as a stator of a rotating electrical machine used in a vehicle, an annular stator core having a plurality of circumferentially arranged slots, and a plurality of phase windings inserted into the slots and wound around the stator core 2. Description of the Related Art There is known a stator winding having a wire and an output wire connecting an end portion of a phase winding and an external terminal. In this stator, the phase winding and the output line are made of copper wire, and their ends are welded (connected).

  In recent years, studies have been made to adopt aluminum wires instead of copper wires as the conductors forming the stator windings. Specifically, a case where a copper wire is adopted as one of the phase winding and the output wire and an aluminum wire is adopted as the other wire has been studied.

  For example, Patent Document 1 discloses a technique in which an aluminum wire is thermally crimped and a copper wire is soldered or welded to a terminal formed from a nickel-plated aluminum plate.

JP 2013-20983 A

However, in this case, there is a possibility that the joint (welded part) between the two may be damaged. Specifically, when the rotating electrical machine is operated, a large current flows through the stator winding, and the stator winding generates heat. There is a difference in the coefficient of thermal expansion between copper and aluminum, and repetitive volume changes (thermal expansion) may cause stress to concentrate on the bonding interface of dissimilar metals and cause separation (breakage) of the interface. In addition, the thermal expansion coefficient of copper is 16.8 × 10 ⁻⁶ / K, and aluminum is 23 × 10 ⁻⁶ / K.

  Furthermore, since the rotating electrical machine mounted on the vehicle is also subjected to vibration of the vehicle, the concentration of stress due to this vibration is also concentrated on the joint. The vibration of the vehicle promotes the extension when peeling (breakage) occurs at the interface of the joint portion, and finally causes the joint portion to break.

  The present invention has been made in view of the above circumstances, and in a stator of a rotating electrical machine including a stator winding formed by connecting (joining) a plurality of conductors, a connection part (joint) of the conductors It is an object of the present invention to provide a stator for a rotating electrical machine in which damage to the motor is suppressed.

  In order to solve the above-mentioned problems, the present inventors have studied the method for firmly connecting (joining) a plurality of conductive wires forming a stator winding, and as a result, have come to make the present invention.

  A stator of a rotating electrical machine according to the present invention includes an annular stator core having a plurality of slots arranged in the circumferential direction, a plurality of phase windings inserted into the slots and wound around the stator core, A stator winding having a plurality of output wires for connecting each end of each of the phase windings and an external terminal, and a stator of the rotating electrical machine, wherein the ends of the phase windings and the output wires The end portions are parallel to each other in the extending direction, and each end portion is joined to the connection terminal, and the connection terminal is joined in a state of surrounding the end portion of the phase winding, And an output line joint that joins the output line in a state of surrounding the end of the output line.

  The stator of the rotating electrical machine of the present invention has a connection terminal including two joint portions that join each of the phase winding and the end portion of the output line constituting the stator winding in an enclosed state. ing. According to this configuration, the ends of the phase winding and the output line are joined to the connection terminal in a state surrounded by the phase winding joint or the output line joint, that is, in a wide area. As a result, the bonding interface can be widened and the bonding can be performed firmly.

  In addition, the phase winding of the stator winding and the direction in which the end of the output line extends are parallel to each other, so that even if each line undergoes a volume change (thermal expansion), the volume change (thermal expansion) of each line ) Direction is also parallel. In this case, even if there is a difference between the thermal expansion coefficients of the two lines, stress is applied in a direction that regulates volume change (thermal expansion), and breakage at the joint can be suppressed.

  The end of the phase winding and the end of the output line preferably extend in the same direction. According to this configuration, when there is a difference in the coefficient of thermal expansion, the smaller the coefficient of thermal expansion, when the larger coefficient of thermal expansion is going to change the volume, the volume change is regulated. In addition, since the end portions of the two lines extend in the same direction, the connection terminal can be easily assembled.

  In the present invention, “the state in which the end portion is surrounded” in the two joint portions of the connection terminal indicates a state in which the end portion of each line is in surface contact with the outer peripheral surface in the circumferential direction. That is, when the end of each line is regarded as a columnar shape, the connection between the end of each line and each joint is in a state having at least a length in the circumferential direction. Here, when the edge part of each line | wire forms prismatic shape, the state joined by two or more outer peripheral surfaces is shown.

FIG. 2 is a cross-sectional view schematically showing the configuration of the rotating electrical machine of the first embodiment. FIG. 3 is a perspective view schematically showing a configuration of a stator of the rotating electrical machine according to the first embodiment. It is a perspective view which shows typically the structure of the junction part of a phase winding and an output line among the stators of the rotary electric machine of Embodiment 1. FIG. It is sectional drawing which shows typically the structure of the junction part of a phase winding and an output line among the stators of the rotary electric machine of Embodiment 1. FIG. It is sectional drawing which shows typically the structure of the junction part of a phase winding and an output line among the stators of the rotary electric machine of Embodiment 1 in the state which has an insulating film. It is sectional drawing which shows the structure of conducting wire. It is sectional drawing which shows the structure of conducting wire. It is sectional drawing which shows typically the structure of the junction part of a phase winding and an output line among the stators of the rotary electric machine of Embodiment 2 in the state which has an insulating film. It is sectional drawing which shows typically the structure of the junction part of a phase winding and an output line among the stators of the rotary electric machine of Embodiment 2 in the state which has an insulating film. In Embodiment 2, it is a figure which shows typically the process of forming an insulating film in the junction part of a phase winding and an output line. FIG. 6 is a perspective view schematically showing a configuration of a stator of a rotating electric machine according to a third embodiment. It is a perspective view which shows typically the structure of the junction part of a phase winding and an output line among the stators of the rotary electric machine of Embodiment 3. It is sectional drawing which shows typically the structure of the junction part of a phase winding and an output line among the stators of the rotary electric machine of the modification 1. It is sectional drawing which shows typically the structure of the junction part of a phase winding and an output line among the stators of the rotary electric machine of the modification 2. It is sectional drawing which shows typically the structure of the junction part of a phase winding and an output line among the stators of the rotary electric machine of the modification 3.

  Hereinafter, embodiments of a stator for a rotating electrical machine according to the present invention will be specifically described with reference to the drawings.

[Embodiment 1]
The rotating electrical machine of Embodiment 1 will be described with reference to FIGS.
The rotating electrical machine 1 of this embodiment is used as a motor for a vehicle. As shown in FIG. 1, the rotating electrical machine 1 is configured such that a pair of bottomed cylindrical housing members 10 a and 10 b are joined at openings, and the housing 10 is rotatable via bearings 11 and 12. The rotary shaft 13 is supported, the rotor 14 is fixed to the outer periphery of the rotary shaft 13, and the stator 20 is fixed to the inner wall surface of the housing 10 at a position surrounding the rotor 14.

  The rotor 14 has a plurality of permanent magnets arranged at a predetermined distance in the circumferential direction on the outer circumferential side opposed to the inner circumferential side of the stator 20 in the radial direction, and these permanent magnets are polar in the circumferential direction. A plurality of alternately different magnetic poles are formed. The number of magnetic poles of the rotor 14 is not limited because it varies depending on the rotating electrical machine. In this embodiment, an 8-pole (N-pole: 4, S-pole: 4) rotor is used.

  As shown in FIG. 2, the stator 20 includes a stator core 30 that is formed in an annular shape so as to face the outer side in the radial direction of the rotor 14, and a plurality of phases wound around the stator core 30. And a three-phase stator winding 40 composed of windings. The stator core 30 is formed by laminating and fixing a plurality of electromagnetic steel plates formed in a predetermined annular shape in the axial direction of the stator core 30. An insulating thin film is disposed between the laminated electrical steel sheets. Further, the stator core 30 may be formed not only from a laminated body of electromagnetic steel sheets but also using a conventionally known metal thin plate and insulating thin film.

  As shown in FIG. 2, the stator core 30 has a plurality of slots 31 arranged at equal intervals in the circumferential direction along the inner peripheral portion thereof. The slot 31 is formed so that the depth direction thereof coincides with the radial direction. The number of slots 31 formed in the stator core 30 is two per one phase of the stator winding 40 with respect to the number of magnetic poles (eight magnetic poles) of the rotor 14. In this embodiment, since 8 × 3 × 2 = 48, the number of slots is 48.

  The stator winding 40 is wound around the stator core 30 by winding a plurality of conductors 50 by a predetermined winding method. As shown in FIG. 6, the conducting wire 50 constituting the stator winding 40 includes a conductor 51 having a rectangular cross section made of a conductive material having electrical conductivity, an inner layer 52 a that covers the outer periphery of the conductor 51, and insulates the conductor 51. It is formed from an insulating film 52 made of 52b, and a rectangular wire with an insulating film is employed.

  The conductor 51 is formed of aluminum, which is a conductor (conductive material) having electrical conductivity. The conductor 51 may use a conductive metal such as copper other than aluminum.

  The thickness of the insulating coating 52 including the inner layer 52a and the outer layer 52b is set between 100 μm and 200 μm. Thus, since the thickness of the insulating film 52 composed of the inner layer 52a and the outer layer 52b is thick, it is not necessary to sandwich an insulating paper or the like between the conductors 50 in order to insulate the conductors 50 from each other. An insulating paper may be disposed between the stator core 30 and the stator winding 40.

  The outer layer 52b is formed of an insulating material such as nylon, and the inner layer 52a is formed of an insulating material such as a thermoplastic resin or a polyamideimide having a glass transition temperature higher than that of the outer layer 52b. As a result, the outer layer 52b softens faster than the inner layer 52a due to the heat generated in the rotating electrical machine, so that the plurality of conductors 50 accommodated in the same slot 31 are integrated and the conductors 50 are rigidized. The mechanical strength of the conducting wire 50 is improved. In addition, even if excessive vibration occurs, the adhesion portion between the inner layer 52a and the outer layer 52b is peeled off before the adhesion portion between the inner layer 52a and the conductor 51, so that the adhesion between the inner layer 52a and the conductor 51 is maintained and insulation is maintained. Can be secured.

  Furthermore, as shown in FIG. 7, the conductor 50 may coat the outer periphery of the insulating coating 52 made of the inner layer 52a and the outer layer 52b with a fusion material 53 made of epoxy resin or the like. As a result, the fusion material 53 is melted faster than the insulating coating 52 by the heat generated in the rotating electrical machine, so that the plurality of conductors 50 accommodated in the same slot 31 are thermally bonded by the fusion material 53. As a result, the plurality of conductors 50 accommodated in the same slot 31 are integrated to make the conductors 50 rigid, so that the mechanical strength of the conductors 50 in the slot 31 is improved. A film made of polyphenylene sulfide (PPS) may be used for the outer layer 52b of the insulating film 52.

  The conducting wire 50 constituting the stator winding 40 is formed into a shape that is inserted into the slot 31 on the inner peripheral side of the stator core 30 and waved along the circumferential direction. That is, the conducting wire 50 includes a linear slot accommodating portion accommodated in different slots 31 of the stator core 30 and a turn portion that connects adjacent slot accommodating portions to each other outside the slot 31.

  In this case, the slot accommodating portion of each conducting wire 50 is accommodated in the slot 31 for each predetermined number of slots (3 phases × 2 (double slots) = 6), and the turn portion is the axial end surface of the stator core 30. Protruding from. As a result, as shown in FIG. 1, an annular first coil end 41 formed of an assembly of a large number of turn portions is provided on one end side in the axial direction of the stator winding 40 (right side in FIG. 1, bearing 12 side). Is formed. Further, an annular second coil end 42 formed of an assembly of a large number of turn portions is formed on the other axial end side of the stator winding 40 (left side in FIG. 1, bearing 11 side).

  The stator winding 40 is formed by winding a conducting wire 50 so that a three-phase (U-phase, V-phase, W-phase) stator winding can be formed. In the present invention and the present embodiment, the winding method (connection method) of the conductive wire 50 of the stator winding 40 is not limited. Moreover, in each figure which shows this invention, the specific form of winding of the conducting wire 50 is abbreviate | omitted, and the stator winding | coil 40 is shown only by the external shape.

  The stator winding 40 is connected to the output line 45 via the connection terminal 44 at the output side end of the phase winding 43 of each phase formed by the conducting wire 50 (see FIGS. 2 to 5). Joined). The output line 45 has an end portion that is not joined to the connection terminal 44 connected to an external terminal of the stator winding 40 (or forms an external terminal). The joint portion is shown in an enlarged perspective view in FIG. 2 to 4, the insulating coating 46 is not shown for the sake of explanation.

  As shown in FIG. 2, the phase winding 43 is formed so that its end protrudes from the axial end surfaces of the coil ends 41 and 42. As shown in FIG. 5 to be described later, the end of the phase winding 43 is formed by exposing the conductor 51, in which the insulating coating 52 is not formed at the tip. Furthermore, in this embodiment, all the end portions of the three phase windings 43, 43, 43 are formed in a state protruding from the axial end surface of the coil end 41 along the axial direction.

  As shown in FIG. 2, the output wire 45 is arranged such that the end joined to the phase winding 43 protrudes from the end surfaces in the axial direction of the coil ends 41 and 42. In the present embodiment, the output line 45 extends along the axial end surface of the coil end 41 and is adjacent to (close to) the phase winding 43 in an axial direction that is parallel to the direction in which the phase winding 43 extends. Curve to stretch along. As shown in FIG. 3, the phase winding 43 and the output wire 45 have the same distance from the end surface of the coil end 41 (stator core 30) at the tip (tip surface) of each wire 43, 45 (projection height). Are the same).

  Similarly to the conducting wire 50 of the phase winding 43, the output line 45 is also formed of a conductor 51 'and an insulating film 52'. The conductor 51 'of the output line 45 may be made of the same material as that of the conductor 51 of the conducting wire 50, or may be made of a different material. In this embodiment, the conductor 51' is made of a different material (copper).

  As shown in the cross-sectional view perpendicular to the axial direction in FIG. 4, the connection terminal 44 is joined with the phase winding joint 44 </ b> A joined in a state of surrounding the phase winding 43 and the output line 45. Output line connecting portion 44B. The phase winding joint 44A and the output line joint 44B are joined in a state where the conductors 51 of the wires 43 and 45 are exposed.

  The connection terminal 44 is formed by bending a band-shaped metal into a substantially S shape (crank shape). The connection terminal 44 is formed with a phase winding joint 44A in one space partitioned by a substantially S-shape (crank shape) and an output line joint 44B in the other. Although the material which forms the connection terminal 44 is not limited, It is preferable that it is the same material as the conductors 51 and 51 'of each of the lines 43 and 45. In this embodiment, aluminum which is the same material as the conductor 51 of the phase winding 43 is used.

  The size of the band-shaped metal forming the connection terminal 44 is not limited. The length in the longitudinal direction may be a length that can form the joint portions 44A and 44B. Regarding the length in the width direction perpendicular to the longitudinal direction, it is sufficient if there is a width that can fix the lines 43 and 45 when they are joined.

The connection of the wires 43 and 45 via the connection terminal 44 may be either welding to be heated, caulking with the connection terminal 44 surrounding the wires 43 or 45, or using both together. Good. In this embodiment, crimping is performed in a state in which the connection terminal 44 surrounds the ends of the wires 43 and 45, and thereafter, the welding is performed by welding.
As shown in the schematic diagram of FIG. 5, the joint portions of the wires 43 and 45 are covered with an insulating film 46 made of an insulating resin.

  The insulating film 46 is formed so as to cover the end portions of the wires 43 and 45 and the connection terminal 44. The insulating coating 46 is formed so as to cover not only the exposed portions of the conductors 51 and 51 ′ of the wires 43 and 45 but also a part of the insulating coatings 52 and 52 ′ (also covers the insulating coatings 52 and 52 ′). Is done.

  The insulating coating 46 in this embodiment is formed from a heat shrink resin. It forms by covering the edge part of each line 43 and 45 and the junction part of the connection terminal 44 with a heat-shrink resin sheet (film), and then shrink | contracting by heating.

(Function and effect of this embodiment)
In the rotating electrical machine 1 of the present embodiment, the end of the phase winding 43 and the end of the output line 45 are joined to the connection terminal 44 with the extending directions thereof being parallel to each other. The connection terminal 44 includes a phase winding joint 44A that is joined in a state of surrounding the end of the phase winding 43, and an output line joint 44B that is joined in a state of surrounding the end of the output line 45. Have.

  According to this configuration, the ends of the phase winding 43 and the output line 45 are surrounded by the phase winding joint 44A or the output line joint 44B, that is, the ends of the wires 43 and 45 and the connection terminal 44. Are joined in a wide area. As a result, the bonding area can be increased, and each of the wires 43 and 45 can be firmly bonded to the connection terminal 44.

  Furthermore, in this embodiment, the end portion of the phase winding 43 and the joint portion of the output line 45 have a large surface area due to the connection terminal 44. According to this configuration, the heat dissipation of the end portion of the phase winding 43 and the joint portion of the output line 45 is enhanced, and the heat dissipation of the stator 20 (stator winding 40) is improved.

  In this embodiment, a phase winding joint 44A is formed in one space of a substantially S-shape (crank shape), and an output line joint 44B is formed in the other, and the phase winding 43 has a large area of three surfaces. (The output line 45 is also equivalent). That is, each of the lines 43 and 45 is joined more firmly.

  Furthermore, since the connection terminal 44 is substantially S-shaped (crank shape), the two joint portions 44A and 44B share a part of the band-shaped metal. In this configuration, not only the two joints 44A and 44B can be joined simultaneously, but also the distance between the end of the phase winding 43 and the end of the output line 45 can be shortened, and loss due to electrical resistance can be suppressed. Can do.

  Even if the lines 43 and 45 change in volume (thermal expansion) because the extending direction of the end portions of the phase winding 43 and the output line 45 constituting the stator winding 40 are parallel to each other, The direction of volume change (thermal expansion) of 45 is also parallel. In this case, even if there is a difference between the thermal expansion coefficients of the two wires, even if a line with a large thermal expansion coefficient (phase winding 43 made of aluminum) is generated in the direction in which the volume change extends, a line with a small thermal expansion coefficient is obtained. (Output line 45 made of copper) works to regulate volume change (thermal expansion) due to a difference in thermal expansion. And the damage in a junction part is suppressed.

  In this embodiment, in particular, since the extending direction of the end portions of the phase winding 43 and the output line 45 extends in the same direction, the direction of volume change (thermal expansion) is the same direction. In this case, the stress applied to the joint can be further reduced from the difference in thermal expansion coefficient between the two lines, and damage can be further suppressed.

  Note that the ends of the phase winding 43 and the output line 45 may be extended in the opposite direction as long as the extending directions are parallel to each other. In this case, stress is applied in a direction in which the elongation (expansion) of the phase winding 43 is suppressed by the expansion (expansion) of the output line 45. In this case, it is possible to regulate the elongation by applying a larger stress to the phase winding 43 than in the case where the extending direction of the end portion is the same direction.

  In this embodiment, the joint between the phase winding 43 and the output line 45 is covered with an insulating coating 46 formed from a heat-shrinkable resin. By having the insulating coating 46, the electrical insulation of the joint is ensured. Furthermore, since the insulating coating 46 is formed from a heat-shrinkable resin, the insulating coating 46 can be easily formed in a predetermined range.

  Further, since the insulating film 46 is formed so as to cover the insulating films 52 and 52 ′ of the wires 43 and 45, the conductors 51 and 51 ′ are not exposed, and electrical insulation can be further ensured.

[Embodiment 2]
The present embodiment is a rotating electrical machine having the same configuration as that of the rotating electrical machine 1 of the first embodiment except that the insulating coating 46 of the stator winding 40 is different. The configuration in the vicinity of the junction between the phase winding 43 and the output line 45 of this embodiment is schematically shown in FIG.

  In this embodiment, the phase winding 43 and the output line 45 are joined via the connection terminal 44 in the same manner as in the first embodiment. Then, an insulating film 46 ′ is formed so as to cover the joint portion.

  The insulating coating 46 ′ in this embodiment is formed from an insulating resin that has fluidity. Insulating resin is adhered and cooled while the joined portion where the wires 43 and 45 are joined via the connection terminal 44 is heated.

  In this embodiment, the insulating coating 46 'is formed from a powdery insulating resin. The powdery insulating resin can be easily disposed around the joint between the wires 43 and 45, and the insulating coating 46 'can be easily formed.

  Further, the powdered insulating resin has fluidity, and when attached to the joints of the wires 43 and 45, the insulating coating 46 'can be easily formed without causing a gap due to the fluidity of the insulating resin itself. Can be formed.

  In particular, when the phase winding 43 and the output line 45 are joined to the connection terminal 44, the insulation films 52 and 52 ′ of the wires 43 and 45 are deformed (deformation in the direction in which the tip is opened as shown in FIG. 9). When this occurs, the powdery insulating resin can flow in and fill, and the insulating coating 46 'can be formed without any gaps. In this configuration, a longer creepage distance can be secured by the insulating coating 46 ′, and higher electrical insulation can be obtained.

In this embodiment, the end of the phase winding 43 and the end of the output line 45 are arranged in a state where the distance from the end surface of the coil end 41 (stator core 30) is the same (the projection height is the same). According to this configuration, as shown in FIG. 10, the powdered insulating resin is placed in a tank-like container (powder resin tank) together with the gas (air), and the joints of the wires 43 and 45 have a predetermined depth. By immersing (inserting), all joints can be immersed (inserted) at the same immersion depth. Thereby, the same insulating film 46 'can be easily formed at each joint. At this time, the powdered insulating resin may be in the form of a solution such as a state melted by heating or a state dissolved in a dispersion medium. Alternatively, the insulating coating 46 may be formed by spraying and attaching insulating resin powder to the ends of the wires 43 and 45 and the joints of the connection terminals 44.
In addition, the present embodiment can exhibit the same effects as those of the first embodiment.

[Embodiment 3]
The present embodiment is a rotating electrical machine having a configuration similar to that of the rotating electrical machine 1 of the first embodiment except that the configuration in the vicinity of the joint between the phase winding 43 and the output line 45 is different. FIG. 11 is a perspective view of the stator 20 of the present embodiment in order to show the configuration in the vicinity of the joint between the phase winding 43 and the output line 45 of the present embodiment. FIG. 11 is a view similar to FIG. 2 described above. Further, the configuration in the vicinity of the joint between the phase winding 43 and the output line 45 is shown in FIG. 12 as an enlarged view.

In this embodiment, the phase winding 43 and the output line 45 are further bent so that the ends thereof extend in the axial direction from the end surface of the coil end 41 and then extend radially outward.
Also in this embodiment, the same effect as in the first embodiment can be exhibited.

  In this embodiment, it is possible to shorten the protruding height from the end face of the coil end 41 at the joint between the phase winding 43 and the output line 45. That is, this form can shorten the axial direction length of the stator 30, and can reduce the whole physique (axial direction length) of a rotary electric machine.

[Deformation]
In each of the embodiments described above, the connection terminal 44 is formed by bending a band-shaped metal into a substantially S shape (crank shape), but is limited to this shape as long as it has two joint portions 44A and 44B. Not.

(Modification 1)
The connection terminal 44 of this embodiment is the connection terminal 44 whose structure is shown in a sectional view in FIG.
As shown in FIG. 13, the connection terminal 44 of this embodiment has a substantially H-shaped cross section that is open in the direction in which the two joint portions 44 </ b> A and 44 </ b> B are facing away.
Even in this embodiment, the same effects as the above-described embodiments can be exhibited.

(Modification 2)
The connection terminal 44 of this embodiment is the connection terminal 44 whose structure is shown in a sectional view in FIG.
As shown in FIG. 14, the connection terminal 44 of this embodiment has a substantially E-shaped cross section in which two joint portions 44A and 44B are opened in the same direction.
Even in this embodiment, the same effects as the above-described embodiments can be exhibited.

(Modification 3)
The connection terminal 44 of this embodiment is the connection terminal 44 whose structure is shown in a sectional view in FIG.
As shown in FIG. 15, the connection terminal 44 of this embodiment has a substantially W-shaped cross section in which two joint portions 44 </ b> A and 44 </ b> B are opened in the same direction.

In this embodiment, the two joint portions 44A and 44B are connected by the connection portion 44C. According to this configuration, even if the two joint portions 44A and 44B are displaced, the connection portion 44C relieves the stress. That is, the concentration of stress at the joint between the phase winding 43 and the output line 45 can be suppressed, and the occurrence of damage can be further suppressed.
Furthermore, the same effects as the above-described embodiments can be exhibited.

1: rotating electric machine 10: housing 11, 12: bearing 13: rotating shaft 14: rotor 20: stator 30: stator core 31: slot 40: stator winding 41, 42: coil end 43: phase winding 44 : Connection terminal 45: Output line 46: Insulating coating 50: Conductor 51, 51 ': Conductor 52, 52': Insulating coating 53: Fusion material

Claims (10)

An annular stator core (30) having a plurality of slots (31) arranged in the circumferential direction;
A plurality of phase windings (43, 43, 43) inserted in the slot and wound around the stator core, and a plurality of outputs for connecting respective end portions of the plurality of phase windings and external terminals A stator winding (40) having wires (45, 45, 45);
In the stator (20) of the rotating electrical machine provided with
Each end of the phase winding and the end of the output line are joined to the connection terminal (44) in a state in which the extending direction is parallel,
The connection terminal includes a phase winding joint (44A) that joins the end of the phase winding in an enclosed state, and an output line joint (44B) that joins the end of the output line in an enclosed state. And a stator for a rotating electric machine.   The stator of the rotating electrical machine according to claim 1, wherein an end portion of the phase winding and an end portion of the output line extend in the same direction.   The stator of the rotating electrical machine according to any one of claims 1 to 2, wherein the connection terminal has a crank shape in a cross section perpendicular to a direction in which an end portion of the phase winding and an end portion of the output line extend.   The stator of the rotating electrical machine according to any one of claims 1 to 3, wherein the connection terminal has an S-shaped cross section perpendicular to a direction in which an end of the phase winding and an end of the output line extend. .   The stator of a rotating electrical machine according to any one of claims 1 to 4, wherein the connection terminal is formed of the same material as any of the phase winding and the output line.   The stator for a rotating electric machine according to any one of claims 1 to 5, wherein the connection terminal and the phase winding are made of aluminum, and the output line is made of copper.   The stator of the rotating electrical machine according to any one of claims 1 to 6, wherein an insulating coating (46) is formed at a joint portion between the phase winding and the output line.   The stator for a rotating electric machine according to claim 7, wherein the insulating coating is formed of a heat shrink resin.   The stator for a rotating electrical machine according to claim 7, wherein the insulating coating is formed by adhering a powdery or solution-like insulating resin.   The end of the phase winding and the end of the output line are formed at the same height from the axial end surface of the stator core toward the outside. The stator of the rotating electrical machine according to the item.

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