Rotating electric machine

Abstract

To provide a rotary electric machine in which a device configuration of a device having an insulation portion for insulation disposed between adjacent bonding portions of a coil can be simplified.SOLUTION: A rotary electric machine 100 includes a rotor 101 that includes a shaft 11, a stator 102 that includes a stator core 20, and a coil 21 having, on one side in an axial direction, a plurality of bonding portions 23 each obtained by bonding segment conductors 21a together and having a coil end portion 22a protruding from the stator core 20 to the one side in the axial direction, and a motor housing 103 that covers the rotor 101 and the stator 102. An insulation portion 40 that is disposed between the adjacent bonding portions 23 and insulates the adjacent bonding portions 23 from each other is integrally disposed in the motor housing 103.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] Conventionally, a rotating electrical machine having an insulating portion for insulating between adjacent connection portions in a connection portion for electrically connecting segment conductors to each other is known (see, for example, Patent Document 1).

[0003] Patent Document 1 discloses a rotating electrical machine including a stator including a coil provided with a plurality of connection portions (joint portions) for electrically connecting segment conductors protruding from one end of a stator core, a cover covering the plurality of connection portions of the coil, and a rotor. The cover is attached to the stator core from one side in the axial direction and covers the coil end portion including the connection portion from one side in the axial direction. The cover has an insulating portion for insulating between adjacent connection portions. By attaching the cover to the stator core, the insulating portion is disposed between adjacent connection portions. The tip position of the insulating portion is disposed between adjacent connection portions. As a result, the insulating portion insulates between adjacent connection portions. The rotating electrical machine further includes a case covering the rotor, the stator, and the cover.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the rotating electrical machine described in Patent Document 1, a plurality of connection portions (joint portions) of the coil are doubly covered by both a cover having an insulating portion and a case covering the rotor, the stator, and the cover, and the structure is complicated. In the field of rotating electrical machines, it is desired to eliminate the complication of the structure and simplify the structure.

[0006] This invention was made to solve the above-mentioned problems, and one object of this invention is to provide a rotating electric machine that can simplify the structure in a configuration in which an insulating part is placed between adjacent joints of coils for insulation. [Means for solving the problem]

[0007] In a rotating electric machine according to one aspect of this invention, as described above, the machine includes a rotor including a shaft, a stator including a stator core, a coil having a plurality of joints connecting segment conductors provided on one side in the axial direction and a coil end portion protruding from the stator core on one side in the axial direction, and a motor housing covering the rotor and stator, wherein the motor housing is integrally provided with insulating portions arranged between adjacent joints to insulate the adjacent joints.

[0008] In a rotating electric machine according to one aspect of this invention, as described above, an insulating part is integrally provided in the motor housing that covers the rotor and stator, positioned between adjacent joints to insulate them. This differs from conventional structures that have both a cover with an insulating part and a case that covers the rotor, stator, and cover (a structure in which the connection parts are covered in two layers and the insulating part insulates the adjacent connection parts). As a result, the insulating part is integrally provided, and the motor housing that covers the rotor and stator alone can insulate the adjacent joints. Consequently, the number of parts in the rotating electric machine can be reduced, and the structure can be simplified in configurations where an insulating part is placed between adjacent joints of coils for insulation. Furthermore, since a conventional cover is not required, the rotating electric machine can be made smaller. In addition, the assembly process of the rotating electric machine can be simplified as the assembly of a double cover, as in conventional designs, is not required.

[0009] In the rotating electric machine according to the first aspect described above, preferably, the motor housing includes a hollow housing case having an opening and a housing cover integrally provided with an insulating portion and attached to the housing case so as to close the opening, wherein the housing cover is attached to the housing case so as to position the insulating portion between adjacent joints.

[0010] With this configuration, the housing cover that constitutes the motor housing can be attached to the housing case, and the insulating part can be placed between adjacent joints, thereby insulating the adjacent joints.

[0011] In this case, preferably, the housing cover is formed by a resin cover portion made of resin with an integrally provided insulating portion and a metal cover portion made of metal that supports the shaft.

[0012] With this configuration, the resin cover portion, which has an integrated insulating section, ensures insulation between adjacent joints, and the metal cover portion, which has higher rigidity compared to the resin cover portion, provides stable support for the shaft.

[0013] In a rotating electric machine according to one aspect of this invention, as described above, the joint portion of the coil extends in one axial direction away from the stator core, the coil has an insulating coating and a joint portion from which the insulating coating has been removed, the insulating portion protrudes in the other axial direction from the motor housing body, and the tip of the insulating portion on the other axial side extends beyond the joint portion into the space between adjacent insulating coatings.

[0014] With this configuration, the leading edge of the insulating section extends beyond the joint and into the space between adjacent insulating coatings. This allows the insulating section to be placed across the entire area between adjacent joints, thereby ensuring a large insulating distance between adjacent joints (the distance between conductors that must be maintained to prevent short circuits through the space between conductors).

[0015] Regarding the above-mentioned rotating electric machine, the following configurations are also possible.

[0016] (Additional note 1) For example, in a configuration in which the tip of the insulating portion extends between adjacent insulating coatings, preferably, the tip of the insulating portion on the other axial side is formed to taper toward the other side.

[0017] With this configuration, the tapered tip of the insulating part can be used to easily insert and position it between adjacent joints.

[0018] (Additional note 2) Furthermore, in a configuration in which the motor housing includes a housing case and a housing cover on which an insulating part is integrally provided, preferably, the end face of the housing cover on the stator core side is provided with a recess that is recessed toward one side in the axial direction away from the stator core, the insulating part is arranged on the bottom surface portion on one side in the axial direction of the recess, and the recess is configured such that a coolant that cools the joint flows inside.

[0019] With this configuration, the coil end can be effectively cooled by directly exchanging heat with the joint (conductor) through which the refrigerant flowing through the recess is brought into contact.

[0020] (Additional note 3) Furthermore, in the above-mentioned rotating electric machine, preferably, the insulating portion has multiple rows of walls extending in the radial and axial directions, and is formed in a grid shape that divides the spaces between multiple joints with the multiple rows of walls.

[0021] With this configuration, multiple joints can be partitioned by insulating sections formed in a grid pattern by multiple rows of walls, thereby more effectively ensuring insulation between adjacent joints.

[0022] (Additional note 4) In addition, in a configuration including the motor housing and a housing cover in which an insulating portion is integrally provided with a housing case, preferably, the housing cover is entirely made of resin including the insulating portion, and is configured to be disposed between joints adjacent to the resin insulating portion.

[0023] With this configuration, the housing cover with the integrally provided insulating portion can be easily manufactured by resin molding.

Brief Description of the Drawings

[0024] [Figure 1] It is a cross-sectional view showing the overall configuration of the rotating electric machine according to the embodiment from the radial direction. [Figure 2] It is a cross-sectional view taken along line II-II of FIG. 1. [Figure 3] It is a view taken along line III-III of FIG. 2 as seen in the arrow direction, and is a view showing the stator with the illustration of the housing cover omitted. [Figure 4] It is a cross-sectional view taken along line IV-IV of FIG. 2. [Figure 5] It is a diagram for explaining the flow of oil, which is a refrigerant in the rotating electric machine according to the embodiment. [Figure 6] It is a cross-sectional view showing the housing cover according to the modification from the radial direction. [Figure 7] It is a cross-sectional view showing the overall configuration of the rotating electric machine provided with the motor housing according to the modification from the radial direction. [Figure 8] It is a diagram showing a welded portion according to the modification.

Modes for Carrying Out the Invention

[0025] Hereinafter, embodiments will be described based on the drawings.

[0026] [Embodiment] (Overall Configuration of Rotating Electric Machine) Referring to FIGS. 1 to 5, the rotating electric machine 100 according to the embodiment will be described.

[0027] In each figure, the axial direction of the shaft 11 is indicated by the X direction. The direction from the stator core 20 towards the joint 23 (described later) is indicated by the X1 direction, and the opposite direction is indicated by the X2 direction. The rotational axis C of the rotating electric machine 100, which extends along the shaft 11, extends in the X direction.

[0028] In each figure, the radial direction of the shaft 11 is indicated by the Y direction. Furthermore, the radially outer side of the shaft 11 is indicated by the Y1 direction, and the opposite direction is indicated by the Y2 direction.

[0029] In each figure, the circumferential direction of the shaft 11 is indicated by the R direction.

[0030] As shown in Figure 1, the rotating electric machine 100 comprises a rotor 101, a stator 102, and a motor housing 103 that covers the rotor 101 and the stator 102.

[0031] The motor housing 103 covers the rotor 101 and stator 102 from the radially outer side as well as from both sides in the axial direction. In other words, the motor housing 103 covers the entire rotor 101 and stator 102. The motor housing 103 includes a housing case 3 and a housing cover 4.

[0032] In this embodiment, the housing cover 4 has an integrally provided wall-shaped insulating portion 40 (see Figure 2). The housing cover 4 is attached to the housing case 3, thereby positioning the insulating portion 40 between adjacent joint portions 23. As a result, the insulating portion 40 insulates the adjacent joint portions 23. Further details will be described later.

[0033] (Rotor configuration) The rotor 101 comprises a rotor core 10 and a shaft 11.

[0034] The rotor 101 is positioned radially inward of the stator 102 so as to face the stator 102. In other words, the rotating electric machine 100 is configured as an inner rotor type rotating electric machine.

[0035] The rotor core 10 is formed in an annular shape. The rotor core 10 is constructed by stacking multiple electromagnetic steel sheets in the axial direction. The rotor core 10 is configured to allow magnetic flux to pass through. The rotor core 10 includes a shaft insertion hole 10a and multiple magnet holes (not shown) in which permanent magnets are arranged.

[0036] The shaft 11 is the axial portion that serves as the rotation center of the rotating electric machine 100. For example, the shaft 11 is made of steel.

[0037] (Stator configuration) The stator 102 comprises a stator core 20 and coils 21 arranged in the stator core 20.

[0038] The stator core 20 is constructed by stacking multiple electromagnetic steel sheets in the axial direction, allowing magnetic flux to pass through. The stator core 20 is provided with slots (not shown), which are spaces for passing the coil 21 through in the axial direction, and teeth (not shown), around which the coil 21 is wound.

[0039] Coil 21 is connected to an external power source and is configured to receive power (for example, three-phase AC power). Coil 21 is configured to generate a magnetic field when power is supplied to it.

[0040] The coil 21 has a coil end portion 22a (see Figure 3) that protrudes from the stator core 20 to one side in the axial direction (towards X1) and a coil end portion 22b that protrudes from the stator core 20 to the other side in the axial direction (towards X2).

[0041] The coil end portion 22b is led out from one slot on the other axial side (X2 direction side) of the stator core 20, folded back, and then introduced into another slot.

[0042] As shown in Figure 3, the coil 21 has multiple joints 23 formed by joining segment conductors 21a together on one side in the axial direction. More specifically, the coil 21 (coil end portion 22a) has an insulating coating 24 and joints 23 where the insulating coating 24 has been peeled off. The joints 23 are formed by joining two in-phase metal conductor portions that are exposed when the insulating coating 24 is peeled off.

[0043] As an example, the joint forming the joint portion 23 is TIG welding. As a result of TIG welding, one end of the joint portion 23 in the axial direction becomes rounded (see Figure 4). Therefore, the joint portion 23 is formed to taper toward one side in the axial direction (towards the X1 direction). The joint portion 23 is not covered with an insulating resin or the like, and the metal conductor portion is exposed. In this embodiment, the entire portion where the insulating coating 24 has been peeled off (the exposed metal conductor portion) will be described as the joint portion 23.

[0044] As shown in Figure 2, the multiple segment conductors 21a constituting the coil end portion 22a are arranged in multiple rows in the radial and circumferential directions. The multiple segment conductors 21a constituting the coil end portion 22a are alternately bent to one side in the circumferential direction and the other side in the circumferential direction for each row, from the radially inward (innermost row) to the radially outward (outermost row). Then, the ends of two radially adjacent segment conductors 21a that are bent in opposite directions are joined together after the insulating coating 24 is peeled off, thereby forming a joint portion 23.

[0045] The joint portion 23 of the coil 21 extends in one axial direction (X1 direction) away from the stator core 20 (see Figure 3). The joint portion 23 extends linearly in one axial direction.

[0046] Multiple joints 23 are provided on the coil end portion 22a. Multiple joints 23 are provided in multiple rows so as to be aligned radially and axially, and are arranged in an annular shape overall. Joints 23 aligned radially are arranged at equal intervals with a distance D1 in the radial direction. Joints 23 aligned circumferentially are arranged at equal intervals with a distance D2 in the circumferential direction. The radial distance D1 is smaller than the circumferential distance D2 (D1 <D2)。

[0047] (Motor housing configuration) As shown in Figure 1, the motor housing 103 is integrally provided with an insulating portion 40 positioned between adjacent joints 23 to insulate the adjacent joints 23. More specifically, the motor housing 103 includes a hollow housing case 3 having an opening 33 and a housing cover 4 attached to the housing case 3 so as to close the opening 33. The housing cover 4 is integrally provided with the insulating portion 40.

[0048] The housing case 3 has a cylindrical side wall portion 31 on which the stator core 20 is fixed to its inner circumferential surface, a circular bottom wall portion 32 provided at the other axial end (X2 direction side) of the cylindrical side wall portion 31, and the opening 33 provided at one axial end (X1 direction side) of the cylindrical side wall portion 31.

[0049] The housing case 3 is provided with a cover portion 30a that covers the coil end portion 22b on the other axial side (X2 direction side). The cover portion 30a may be integral with the housing case 3 or may be a separate component.

[0050] The housing cover 4 is configured to be fixed to the housing case 3, which houses the rotor 101 and stator 102, by fixing members F, while being positioned relative to the housing case 3. For example, the housing cover 4 is attached to the housing case 3 by bolts having a positioning function as fixing members F. Alternatively, the housing cover may be attached to the housing case by positioning pins and bolts that do not have a positioning function. Multiple fixing members F are provided along the radially outer edge of the housing cover 4 at predetermined angular intervals.

[0051] When the housing cover 4 is attached to the housing case 3, a sealing member S is installed between the housing cover 4 and the housing case 3. In detail, the sealing member S is positioned along the end face 41 of the housing cover 4 on the stator core 20 side (X2 direction side). The sealing member S is an annular member positioned around the shaft 11, and is installed on the radially outer side and radially inner side of the recess 42 of the housing cover 4, which will be described later.

[0052] For example, the sealing member S is an O-ring. The sealing member may also be a sheet-like sealing member or the like. The sealing member S has the function of preventing the refrigerant, which will be described later, flowing through the recess 42 from leaking out of the recess 42. Although not shown, a similar sealing member is also installed in the cover portion 30a of the housing case 3.

[0053] The end face 41 of the housing cover 4 on the side facing the stator core 20 (X2 direction side) is provided with a recess 42 that is recessed toward one axial direction (X1 direction) away from the stator core 20. Within the recess 42 of the housing cover 4, a sealed closed space is formed by the housing case 3 and the stator core 20. The housing cover 4 abuts against the housing case 3 at the radially outer end face 41 of the recess 42 and abuts against the stator core 20 at the radially inner end face 41 of the recess 42. The insulating portion 40 is located on the bottom surface portion 42a on one axial side (X1 direction side) of the recess 42.

[0054] The insulating portion 40 protrudes from the main body of the motor housing 103 (bottom portion 42a) in the other axial direction (X2 direction). Therefore, the entire insulating portion 40 is located within the recess 42. Note that the main body of the motor housing 103 refers to the portion of the housing case 3 excluding the insulating portion 40.

[0055] The tip 40a on the other axial side of the insulating portion 40 is formed to taper toward the other side (see Figure 4). For example, the tip 40a is processed with a C-chamfer, where the edge is formed at an angle. Alternatively, the tip may be processed with an R-chamfer, where the edge is formed in an arc shape.

[0056] As shown in Figure 2, the insulating portion 40 has multiple rows of wall portions 40b extending in both the radial and axial directions. The insulating portion 40 is formed in a grid shape, with multiple rows of wall portions 40b dividing the spaces between multiple joint portions 23. The joint portion 23 of the insulating portion 40 is positioned approximately in the center of two circumferentially adjacent wall portions 40b. The insulating portion 40 may be in contact with the joint portions 23. For example, the thickness of the radially extending wall portions 40b is greater than the thickness of the circumferentially extending wall portions 40b.

[0057] As shown in Figure 4, the tip 40a on the other axial side (X2 direction side) of the insulating portion 40 extends beyond the joint 23 to the space between adjacent insulating coatings 24. That is, in both the radial and circumferential directions, the insulating portion 40 is always positioned between adjacent joints 23. Therefore, the insulating portion 40 can secure a relatively large insulation distance D3 (length of the portion shown by the bent dashed line) with respect to the radially aligned joints 23 through the space on the other axial side (X2 direction side) of the tip 40a of the insulating portion 40. Naturally, the insulation distance D3 is greater than the distance D1 between radially aligned joints 23 (see Figure 2).

[0058] Furthermore, the insulation distance D3 between two radially adjacent joints 23 is smaller than the insulation distance (not shown) 3 between two circumferentially adjacent joints 23. This is because, as explained above, the distance D1 (see Figure 2) between radially aligned joints 23 is smaller than the distance D2 (see Figure 2) between circumferentially aligned joints 23.

[0059] As shown in Figure 5, the recess 42 is configured so that a coolant flows through it to cool the joint 23 (coil 21). In one example, the coolant is cooling oil. More specifically, the rotating electric machine 100 is provided with an oil pump 104a, an oil cooler 104b, and an oil circulation path 104c for circulating oil within the recess 42. The oil cooled by the oil cooler 104b is sent into the recess 42 by the oil pump 104a.

[0060] In detail, the oil flow is as follows: First, the oil pump 104a supplies oil from the oil cooler 104b to the coil end portion 22b (inside the cover portion 30a) on the other axial side (X2 direction side). Then, the oil is supplied into the recess 42 through axially extending coolant holes (not shown) provided in the stator core 20. After the oil circulates circumferentially within the recess 42, it is returned to the oil cooler 104b.

[0061] The housing cover 4 is formed from a resin cover portion 43a made of resin (for example, PPS resin) with an integrally provided insulating portion 40, and a metal cover portion 43b made of metal (for example, aluminum) that supports the shaft 11. In one example, the housing cover 4 is formed by insert molding.

[0062] The resin cover portion 43a integrally includes the insulating portion 40 and the peripheral portion surrounding the insulating portion 40. The metal cover portion 43b covers the resin cover portion 43a from one side in the axial direction, the radially outer side, and the radially inner side. The metal cover portion 43b supports the shaft 11 via the bearing 11a. The resin cover portion 43a is positioned to contact the refrigerant in the recess 42, while the metal cover portion 43b does not come into contact with the refrigerant in the recess 42. Therefore, the housing cover 4 has a structure in which heat is less likely to be transferred from the refrigerant in the recess 23 by the resin cover portion 43a. As a result, the housing cover 4 can suppress heat dissipation from the refrigerant in the recess 23 through the housing cover 4.

[0063] (Assembly method for rotating electrical machinery) The assembly method (manufacturing method) of the rotating electric machine 100 will be described with reference to Figures 1 and 4.

[0064] The assembly method for the rotating electric machine 100 includes, as a first step, the step of housing the rotor 101 and stator 102 inside the housing case 3.

[0065] In detail, in the first step, the stator core 20 is fixed to the inner circumferential surface of the housing case 3 by shrink fitting or the like. The rotor 101 is also positioned radially inward of the stator core 20.

[0066] Next, the assembly method for the rotating electric machine 100 includes a second step of attaching the housing cover 4 to the housing case 3 and positioning the insulating part 40 between adjacent joints 23.

[0067] In detail, as the second step, the housing cover 4 is attached to the housing case 3 by the fixing member F. At this time, a predetermined guide is used to attach the housing cover 4 to the housing case 3 in a state where the housing cover 4 can move only in the axial direction relative to the housing case 3. As a result, the other axial end portion 40a of the insulating portion 40 extends beyond the joint portion 23 to the space between the adjacent insulating coatings 24. Furthermore, the predetermined guide makes it possible to avoid interference between the joint portion 23 and the insulating portion 40, which extend axially from each other. The predetermined guide may be a shaft 11, a fixing member F with a positioning function, or other structures.

[0068] Thus, in the assembly method of the rotating electric machine 100, by simply attaching the housing cover 4 to the housing case 3, the insulating part 40 can be positioned between adjacent joints 23, thereby achieving insulation between the adjacent joints 23. Therefore, in the manufacturing method of the rotating electric machine 100, a dedicated process for insulation, such as directly coating the joints 23 (conductors) with a resin coating or powder coating, is unnecessary. Furthermore, the overall size of the rotating electric machine 100 can be reduced because the above-mentioned resin coating or powder coating for insulation is no longer required.

[0069] (Effects of the embodiment) In this embodiment, the following effects can be obtained.

[0070] In this embodiment, as described above, an insulating portion 40 is integrally provided in the motor housing 103 that covers the rotor 101 and stator 102, positioned between adjacent joints 23 to insulate the adjacent joints 23. This differs from conventional structures that include both a cover with an insulating portion and a case that covers the rotor, stator, and cover (a structure in which the connection is covered in two layers and the insulating portion insulates the adjacent connection). As a result, the insulating portion 40 is integrally provided, and the motor housing 103 that covers the rotor 101 and stator 102 alone can insulate the adjacent joints 23. Consequently, the number of parts in the rotating electric machine 100 can be reduced, simplifying the structure in a configuration where an insulating portion 40 is positioned between adjacent joints 23 of the coil 21 for insulation. Furthermore, since a conventional cover is not required, the rotating electric machine 100 can be made smaller. In addition, the assembly process of the rotating electric machine 100 can be simplified as the assembly of a double cover, as in conventional designs, is not required.

[0071] In this embodiment, as described above, the motor housing 103 includes a hollow housing case 3 having an opening 33, and a housing cover 4 integrally provided with an insulating portion 40 and attached to the housing case 3 so as to close the opening 33. The housing cover 4 is configured to be attached to the housing case 3 so as to position the insulating portion 40 between adjacent joints 23. As a result, by simply attaching the housing cover constituting the motor housing 103 to the housing case 3, the insulating portion 40 can be positioned between adjacent joints 23, thereby insulating the adjacent joints 23.

[0072] In this embodiment, as described above, the housing cover 4 is formed by a resin cover portion 43a on which an insulating portion 40 is integrally provided, and a metal cover portion 43b that supports the shaft 11. This ensures insulation between adjacent joint portions 23 by the resin cover portion 43a on which the insulating portion 40 is integrally provided, and the shaft 11 can be stably supported by the metal cover portion 43b, which has higher rigidity than the resin cover portion 43a.

[0073] In this embodiment, as described above, the joint portion 23 of the coil 21 extends in one axial direction away from the stator core 20, the coil 21 has an insulating coating 24 and a joint portion 23 from which the insulating coating 24 has been peeled off, the insulating portion 40 protrudes in the other axial direction from the motor housing 103 body, and the tip portion 40a on the other axial side of the insulating portion 40 extends beyond the joint portion 23 to the space between adjacent insulating coatings 24. As a result, since the tip portion 40a of the insulating portion 40 extends beyond the joint portion 23 to the space between adjacent insulating coatings 24, the insulating portion 40 can be placed over the entire space between adjacent joint portions 23, thereby ensuring a large insulating distance (the distance between conductors that should be ensured to prevent short circuits through the space between conductors) (D3) between adjacent joint portions 23.

[0074] In this embodiment, as described above, the tip 40a on the other axial side of the insulating portion 40 is formed to taper toward the other side. This allows the insulating portion 40 to be easily inserted and positioned between adjacent joint portions 23 by utilizing the tapered tip 40a of the insulating portion 40.

[0075] In this embodiment, as described above, the end face 41 of the housing cover 4 on the stator core 20 side is provided with a recess 42 that is recessed toward one side in the axial direction away from the stator core 20, the insulating portion 40 is located on the bottom surface portion 42a on one side in the axial direction of the recess 42, and the recess 42 is configured such that a coolant flows through it to cool the joint portion 23. This allows the coil end portion 22a to be effectively cooled by exchanging heat by bringing the coolant flowing through the recess 42 into direct contact with the joint portion 23 (conductor).

[0076] In this embodiment, as described above, the insulating portion 40 has multiple rows of wall portions 40b extending in both the radial and axial directions, and is formed in a grid shape that partitions the spaces between multiple joint portions 23 with the multiple rows of wall portions 40b. As a result, the spaces between multiple joint portions 23 can be partitioned by the insulating portion 40 formed in a grid shape by the multiple rows of wall portions 40b, thereby more effectively ensuring insulation between adjacent joint portions 23.

[0077] (modified version) It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The scope of the present invention is indicated by the claims rather than by the description of the embodiments above, and further includes all modifications (exceptions) within the meaning and scope equivalent to the claims.

[0078] For example, in the above embodiment, an example was shown in which the housing cover is formed from a resin cover portion made of resin and a metal cover portion made of metal, but the present invention is not limited thereto. In the present invention, as shown in Figure 6, the housing cover 204 may be formed from resin alone. More specifically, the housing cover 204 is entirely made of resin, including the insulating portion 40, and is configured to be placed between adjacent joint portions 23 (see Figure 1).

[0079] Furthermore, although the above embodiment shows an example in which the insulating portion is provided on the housing cover, the present invention is not limited to this. In the present invention, as shown in the motor housing 103a in Figure 7, the insulating portion 40 may be provided on the housing case 303 instead of the housing cover 304. In this case, the housing cover 304 is positioned on the coil end portion 22b side on the other axial direction (X2 direction).

[0080] Furthermore, although the above embodiment shows an example in which the joint is formed by TIG welding, the present invention is not limited thereto. In the present invention, as shown in Figure 8, the joint 23a may be formed by laser welding.

[0081] Furthermore, although the above embodiment shows an example in which oil is supplied from the other coil end in the axial direction to the one coil end in the axial direction via the stator core, the present invention is not limited to this. In the present invention, oil may be supplied directly from an oil pump to each of the other coil end in the axial direction and the one coil end in the axial direction.

[0082] Furthermore, although the above embodiment shows an example in which the rotating electric machine is cooled only by oil, the present invention is not limited to this. In the present invention, the rotating electric machine may be cooled not only by oil but also by water. For example, the stator core may be cooled by providing a conduit that contacts the outer surface of the stator core and flowing water through the conduit.

[0083] Furthermore, although the above embodiment shows an example in which the insulating portion is formed by a grid-like wall, the present invention is not limited thereto. In the present invention, the insulating portion may be formed only by a plurality of annular wall portions extending in the circumferential direction. Alternatively, the insulating portion may be formed only by a plurality of linear wall portions extending in the radial direction. In addition, a cylindrical insulating portion may be provided for each individual joint. In this case, the joint is placed inside the cylindrical insulating portion to provide insulation.

[0084] Furthermore, although the above embodiment shows an example in which the housing cover is formed by insert molding the resin cover portion and the metal cover portion of the housing cover, the present invention is not limited to this. In the present invention, the housing cover may be formed by fastening the resin cover portion and the metal cover portion of the housing cover with bolts. Alternatively, the housing cover may be formed by bonding the resin cover portion and the metal cover portion of the housing cover. [Explanation of Symbols]

[0085] 3 Housing Cases 4,204 Housing Cover 10 shafts 20 stator cores 21 coils 21a Segment conductor 22a Coil end section 23, 23a joint 24 Insulating coating 33 (Housing case) opening 40 Insulation part 40a (Insulated tip) 43a (Housing cover) resin cover part 43b Metal cover part (of the housing cover) 100 Rotating Electric Machines 101 Rotor 102 stata 103, 103a Motor Housing

Claims

1. The rotor including the shaft, A stator includes a stator core and a coil having a coil end portion that protrudes from the stator core toward the same axial direction, with a plurality of joint portions connecting segment conductors provided on one side in the axial direction. The motor housing comprises the rotor and the stator, A rotating electric machine, wherein the motor housing is integrally provided with insulating parts that are positioned between adjacent joints and insulate the adjacent joints from each other.

2. The motor housing is A hollow housing case having an opening, The housing cover includes the insulating portion integrally provided and is attached to the housing case so as to close the opening, The rotating electric machine according to claim 1, wherein the housing cover is attached to the housing case so that the insulating portion is positioned between adjacent joints.

3. The rotating electric machine according to claim 2, wherein the housing cover is formed by a resin cover portion made of resin on which the insulating portion is integrally provided, and a metal cover portion made of metal that supports the shaft.

4. The joint portion of the coil extends in one direction in the axial direction away from the stator core, The coil has an insulating coating and the joint portion from which the insulating coating has been peeled off. The insulating portion protrudes from the motor housing body in the other direction in the axial direction. The rotating electric machine according to claim 1, wherein the other end of the insulating portion in the axial direction extends beyond the joint to the space between adjacent insulating films.

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