Stator for rotating electrical machine

Abstract

To provide a rotary electric machine stator in which an increase in size is suppressed while ensuring insulation.SOLUTION: A terminal member 5 is attached to each of the conductor ends 4 of a coil 2, and each of the terminal members 5 is fixed to a fastening portion 61 of a terminal block 6 arranged radially outward R1 with respect to a stator core 1 by a fastening member 9. The terminal member 5 includes a conductor joint portion 51, a fixing portion 52, and a positioning portion 53. In the terminal member 5, in a state in which the positioning portion 53 is positioned with respect to the terminal block 6 and the fixing portion 52 is fixed to the fastening portion 61, the edge 55 of the radially inner side R2 of the conductor joint portion 51 is formed along the tangent line T of the opposing portion of the conductor joint portion 51 on the outer peripheral surface 1a of the stator core 1.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a stator for a rotating electric machine that includes a cylindrical stator core and a coil wound around the stator core. [Background technology]

[0002] Japanese Patent Laid-Open Publication No. 2013-126329 (see, for example,

[0018] ,

[0023] , and Figs. 1 to 5) discloses a stator (10) for a rotating electric machine in which the insulating coating is removed from the ends (conductor ends) of a coil (70) made of a conductor wire with an insulating coating, and the coil (70) is joined to a terminal member (68) (reference numerals in parentheses in the Background Art section refer to those of the referenced document). In this stator for a rotating electric machine, axial ends (60) of the coils (70) corresponding to three phases are joined to different terminal members (68), and each terminal member (68) is fixed by a fastening member to a terminal block (not shown) or the like fixed to a case (12). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-126329 Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, coils for AC rotating electric machines are provided for multiple phases corresponding to multiple phases of AC, and each phase coil needs to be properly insulated. Since the insulating coating peels off at the conductor ends, it may be necessary to cover the joints between the terminal members and the coils with additional insulators or to increase the spacing between the terminal members. This may result in a larger size of the stator for the rotating electric machine. Furthermore, when the terminal members are fixed to a terminal block or the like, stress may be applied to the terminal members, and the size of the terminal members and the stator may need to be increased in order to ensure the joint strength between the coil and the terminal members.

[0005] In view of the above background, it is desirable to provide a stator for a rotating electric machine that ensures insulation while preventing an increase in size. [Means for solving the problem]

[0006] In view of the above, a stator for a rotating electric machine including a cylindrical stator core and a coil wound around the stator core is provided, wherein the coil includes N (N is an integer of 2 or more) conductor end portions, a terminal member is attached to each of the N conductor end portions, each of the N terminal members is fixed to a fastening portion of a terminal block by a fastening member, the terminal block is fixed to a support member that supports the stator core, and the direction along the axis of the stator core is defined as an axial direction, a direction perpendicular to the axis is defined as a radial direction, and a direction going around the axis is defined as a circumferential direction, and the N fastening members of the terminal block are fixed to a support member that supports the stator core by a fastening member. When viewed in the axial direction along the axial direction, the terminal member is arranged radially outward from the stator core, and the terminal member comprises a conductor joint portion to which the conductor end portion is joined, a fixing portion fixed to the fastening portion by the fastening member, and a positioning portion that is positioned relative to the terminal block, and when the positioning portion is positioned relative to the terminal block and the fixing portion is fixed to the fastening portion, when viewed in the axial direction, the radially inner edge of the conductor joint portion is formed to follow a tangent to a portion of the outer peripheral surface of the stator core that faces the conductor joint portion.

[0007] According to this configuration, the coil and the terminal block can be easily connected by fastening the terminal members attached to each of the N conductor ends to the fastening portions of the terminal block. Since the terminal members have positioning portions, the terminal members can be easily fixed to appropriate positions relative to the terminal block. Furthermore, by properly positioning the terminal members, excessive force is prevented from being applied when the terminal members are fastened to the fastening portions of the terminal block, reducing stress on the terminal members. Furthermore, since the terminal members are formed so that the radially inner edge of the conductor joint portion is positioned along a tangent to the outer peripheral surface of the stator core when viewed in the axial direction, it is easy to ensure an insulation distance between the terminal members and the stator core, even when the fastening portions of the terminal block are relatively close to the stator core. This facilitates miniaturization of the rotating electric machine, including the terminal block. Thus, according to this configuration, a stator for a rotating electric machine can be provided that ensures insulation while suppressing an increase in size.

[0008] Further features and advantages of the stator for a rotating electric machine will become apparent from the following description of the embodiments, which is given with reference to the drawings. [Brief explanation of the drawings]

[0009] [Figure 1] Schematic enlarged view of the axial end of the stator [Figure 2] Plan view of terminal member [Figure 3] Schematic block diagram of a system for driving a rotating electric machine [Figure 4] FIG. 10 is a diagram showing an example of a configuration in which a terminal block, a terminal member, and a coil are connected to each other; [Figure 5] FIG. 10 is a diagram showing another example of a configuration in which a terminal block, a terminal member, and a coil are connected to each other; [Figure 6] FIG. 1 is a diagram illustrating an example of the arrangement relationship between a rotating electric machine and a terminal member; DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of a stator for a rotating electric machine will be described below with reference to the drawings. As shown in FIG. 6, the rotating electric machine MG includes a stator St (a stator for a rotating electric machine) in which a coil 2 is wound around a stator core 1, and a rotor Ro that rotates around an axis X. The stator core 1 is fixed to and supported by a case CS (see FIGS. 4 and 5), not shown in FIG. 6, and the rotor Ro is rotatably supported by the case CS, not shown in FIG. 6, via bearings, not shown. The rotation axis of the rotor Ro is the same as the axis of the cylindrical stator core 1, and in the following description, the rotation axis of the rotor Ro and the axis of the stator core 1 will be simply referred to as axis X. In the following description, the direction along the axis X of the stator core 1 (the rotation axis of the rotor Ro, the axis of the rotating electric machine MG) is referred to as axial direction L, the direction perpendicular to axis X is referred to as radial direction R, and the direction around axis X is referred to as circumferential direction C. In addition, with the axis X as a reference, the outside in the radial direction R is referred to as the radially outer side R1, and the inside is referred to as the radially inner side R2.

[0011] For example, this rotating electric machine MG is used as a driving power source for hybrid vehicles, electric vehicles, etc., and constitutes a part of the vehicle's drive device. Furthermore, this rotating electric machine MG is an electric device (motor / generator) that operates on multi-phase AC (e.g., three-phase AC), and can function as both an electric motor and a generator. As shown in the schematic block diagram of FIG. 3, the rotating electric machine MG receives power from a DC power source PS (e.g., approximately 50 to 400 volts in the case of a vehicle's driving power source) for power running, or supplies (regenerates) power generated by the vehicle's inertial force to the DC power source PS. The DC power source PS is constituted, for example, by a secondary battery (battery) such as a nickel-metal hydride battery or a lithium-ion battery, or an electric double layer capacitor.

[0012] The rotating electric machine MG is driven and controlled via an inverter INV that converts power between DC power and multi-phase AC power. The inverter INV is configured using multiple switching elements (power semiconductor elements) such as IGBTs (Insulated Gate Bipolar Transistors) and power MOSFETs (Metal Oxide Semiconductor Field Effect Transistors), and each switching element is controlled by a rotating electric machine control device (not shown). A DC link capacitor CP (smoothing capacitor) that smooths the voltage between the positive and negative poles (DC link voltage) is provided on the DC side of the inverter INV.

[0013] In the present embodiment, an AC rotating electric machine MG driven by three-phase AC is exemplified, and the rotating electric machine MG includes three-phase coils 2: a first coil 2a (e.g., U-phase), a second coil 2b (e.g., V-phase), and a third coil 2c (e.g., W-phase). As will be described later, each coil 2 is electrically connected to an inverter INV via a terminal member 5. Specifically, the first coil 2a is electrically connected to the inverter INV via a first terminal member 5a, the second coil 2b via a second terminal member 5b, and the third coil 2c via a third terminal member 5c. In the following description, when it is not necessary to separately describe each phase, they will be simply referred to as coils 2 and terminal members 5.

[0014] As shown in FIGS. 1, 6, etc., the stator St includes a cylindrical stator core 1 and N-phase (N is an integer equal to or greater than 2) coils 2 wound around the stator core 1. In this embodiment, as described above, three-phase coils 2 are provided corresponding to three-phase AC. The coil 2 includes N (three in this embodiment) conductor end portions 4, and a terminal member 5 is attached to each of the N (three) conductor end portions 4. Each of the N (three) terminal members 5 is fixed to a fastening portion 61 of a terminal block 6 by a fastening member 9. The terminal block 6 does not necessarily have to be an independent base-like member, and may be, for example, a bus bar connected to the inverter INV or a member to which a bus bar is fixed. That is, it is sufficient if the terminal block 6 has a function of electrically connecting the inverter INV and the coil 2, as shown in FIG. 3.

[0015] Here, a bolt threaded into a threaded hole 69 formed in the terminal block 6 is exemplified as the fastening member 9. However, the fastening member 9 may be a nut threaded into a threaded protrusion formed in the terminal block 6, or a rivet or the like. The terminal block 6 is fixed to a case CS, which serves as a support member supporting the stator core 1. The support member is not limited to the case CS, but may be a separate member fixed to the case CS, or may be both the case CS and the separate member. For example, even if the stator core 1 is supported by the case CS and the terminal block 6 is fixed to a separate member fixed to the case CS, the stator core 1 and the terminal block 6 are fixed to the case CS (support member). As shown in FIG. 1 , the N (three) fastening portions 61 of the terminal block 6 are arranged radially outwardly R1 from the stator core 1 when viewed in the axial direction L.

[0016] As shown in FIGS. 1, 2, 4, etc., the terminal member 5 includes a conductor joint portion 51 to which the conductor end portion 4 is joined, a fixing portion 52 fixed to a fastening portion 61 by a fastening member 9, and a positioning portion 53 that is positioned relative to the terminal block 6. A specific positioning configuration will be described later with reference to FIGS. 4 and 5. When the positioning portion 53 of the terminal member 5 is positioned relative to the terminal block 6 and the fixing portion 52 is fixed to the fastening portion 61, as shown in FIGS. 1 and 2, an edge 55 of the radially inner side R2 of the conductor joint portion 51 is formed along a tangent line T of a portion of the outer circumferential surface 1a of the stator core 1 that faces the conductor joint portion 51, as viewed in the axial direction. Here, "along the tangent line T" means a state in which the edge 55 is parallel to the tangent line T or is tilted within a specified range (for example, within 10°) from the parallel state.

[0017] 1, a first tangent T1 is a tangent line T at a position on the outer peripheral surface 1a of the stator core 1 where a first conductor joint 51a, which is a conductor joint 51 where the first coil 2a and the first terminal member 5a are joined, faces each other. Similarly, a second tangent T2 is a tangent line T at a position on the outer peripheral surface 1a of the stator core 1 where a second conductor joint 51b, which is a conductor joint 51 where the second coil 2b and the second terminal member 5b are joined, faces each other. A third tangent T3 is a tangent line T at a position on the outer peripheral surface 1a of the stator core 1 where a third conductor joint 51c, which is a conductor joint 51 where the third coil 2c and the third terminal member 5c are joined, faces each other. In addition, when viewed in the axial direction, the edge 55 on the radially inner side R2 of the first conductor joint portion 51a is referred to as the first edge 55a, the edge 55 on the radially inner side R2 of the second conductor joint portion 51b is referred to as the second edge 55b, and the edge 55 on the radially inner side R2 of the third conductor joint portion 51c is referred to as the third edge 55c. The three terminal members 5 are formed so that the first edge 55a extends along the first tangent line T1, the second edge 55b extends along the second tangent line T2, and the third edge 55c extends along the third tangent line T3.

[0018] In this way, by fixing the terminal members 5 attached to each of the N (three) conductor ends 4 to the fastening portions 61 of the terminal block 6, the coils 2 and the terminal block 6 can be easily connected. At this time, since the terminal members 5 include the positioning portions 53, the terminal members 5 can be easily fixed at appropriate positions relative to the terminal block 6. Furthermore, by properly positioning the terminal members 5, the application of excessive force when the terminal members 5 are fixed to the fastening portions 61 of the terminal block 6 is suppressed, and stress generated in the terminal members 5 is also reduced. Furthermore, since the terminal members 5 are formed such that the edge 55 on the radially inner side R2 of the conductor joint portion 51 is disposed along the tangent line T to the outer peripheral surface 1a of the stator core 1 when viewed in the axial direction, even when the distance (the distance in the radial direction R) between the fastening portions 61 of the terminal block 6 and the stator core 1 is relatively short, the insulation distance between one terminal member 5 and the stator core 1 is made uniform, making it easy to ensure the insulation distance between the terminal member 5 and the stator core 1.

[0019] In this embodiment, as shown in FIG. 1 , the N (three) terminal members 5 have the same shape. Using terminal members 5 of the same shape can reduce the cost of the drive device, including the rotating electric machine MG. The N (three) fastening portions 61 of the terminal block 6 are arranged so as to line up in the circumferential direction C, as viewed in the axial direction. The N (three) conductor joint portions 51 are arranged so as to line up in the circumferential direction C on the radially outer side R1 of the stator core 1, as viewed in the axial direction. When the conductor joint portions 51 are arranged in this manner, the terminal block 6 can be arranged so as to be aligned along the outer peripheral surface 1a of the stator core 1, as viewed in the axial direction. This facilitates miniaturization of the rotating electric machine MG, including the terminal block 6.

[0020] The conductors constituting the coil 2 are provided with an insulating coating on their surfaces. Therefore, the insulating coating is peeled off at the conductor end 4. The conductor end 4 has the insulating coating removed, and is joined to a conductor joint 51 by crimping or welding, as shown in Figs. 1, 4, and 5. Then, as shown in Fig. 6, N (3) terminal members 5 are arranged so as to overlap with the axial arrangement region of the stator core 1.

[0021] Because the conductor joint 51 and the conductor end 4 from which the insulating coating has been removed are not electrically insulated, it is necessary to ensure an insulating distance from the stator core 1. As described above, in this embodiment, the edge 55 of the conductor joint 51 is formed to extend along the tangent line T, which makes it easier to ensure the insulating distance. This eliminates the need to position the terminal member 5 in the axial direction L relative to the stator core 1, and the terminal member 5 can be positioned so as to overlap with the stator core 1 as viewed in the radial direction. In other words, the terminal member 5 can be easily positioned so as to overlap with the axial arrangement region of the stator core 1. This eliminates the need to ensure space in the axial direction L of the rotating electric machine MG in the accommodation space of the case CS, thereby preventing an increase in the size of the drive device including the rotating electric machine MG in the axial direction L.

[0022] Specific embodiments for positioning the terminal member 5 relative to the terminal block 6 will be described below with reference to FIGS. 4 and 5. First, the details of the positioning portion 53 will be described. As shown in FIGS. 1 and 2, the positioning portion 53 includes a positioning engaging portion 54 that engages with an engaged portion 13 provided on an assembly jig 10 (see FIG. 4) used to fix the fastening portion 61, or a positioning protrusion 63 (see FIG. 5) serving as the engaged portion 13 provided on the terminal block 6. In this embodiment, the positioning engaging portion 54 is a rectangular through-hole formed in the terminal member 5. The positioning engaging portion 54 is used not only when fixing the terminal member 5 to the fastening portion 61, but also when joining the terminal member 5 to the conductor end 4 of the coil 2 wound around the stator core 1.

[0023] The rotating electric machine MG is assembled by assembling the stator St by attaching the coil 2 to the stator core 1, then assembling a subassembly of the stator St by attaching terminal members 5 to the conductor ends 4 of the coil 2 of the stator St, and attaching this subassembly to the case CS (the assembly of the rotor Ro will not be described here). When attaching the subassembly to the case CS, first, the stator core 1 around which the coil 2 is wound is fixed to the case CS (the coil 2 may be wound after the stator core 1 is fixed), and then the terminal members 5 are fixed to the terminal block 6. Naturally, at this time, it is preferable that the positions of the terminal members 5 and the terminal block 6 are appropriately set so that the fastening and fixing with the fastening members 9 does not apply a load to the conductor joints 51 of the terminal members 5 or the coil 2. For this reason, when assembling the above-described subassembly, the terminal members 5 are attached to the coil 2 so that the terminal members 5 are positioned according to the terminal block 6.

[0024] For example, when attaching the terminal members 5 to the stator St, the stator core 1 around which the coil 2 is wound and three (N) terminal members 5 are placed in a subassembly assembly jig (not shown). The subassembly assembly jig is configured so that the positional relationship between the stator core 1 and the terminal block 6 is the same as their positional relationship within the accommodation space of the case CS. The subassembly assembly jig has protrusions formed at locations corresponding to the fastening portions 61 of the terminal block 6. These protrusions are formed so as to correspond to the positions where the fastening members 9 will be located when the terminal members 5 are fastened and fixed to the terminal block 6. The terminal members 5 are positioned relative to the terminal block 6 by passing these protrusions through the fastening member through holes 59 of the three terminal members 5, respectively.

[0025] The subassembly assembling jig further includes a skewer-shaped jig (not shown) having three (N) skewer portions. Each skewer portion of the skewer-shaped jig is arranged to match the arrangement of the first positioning portion 53a of the first terminal member 5a, the second positioning portion 53b of the second terminal member 5b, and the third positioning portion 53c of the third terminal member 5c when the three (N) terminal members 5 are properly fixed to the terminal block 6. Note that this skewer-shaped jig has skewer portions at the same positions as the engaged portions 13 of an assembly jig 10 (see FIGS. 4 and 5), which will be described later. Therefore, the skewer-shaped jig and the assembly jig 10 may be the same jig. Furthermore, even when they are different jigs, the skewer-shaped jig is included in the concept of the assembly jig 10, and the skewer portions correspond to the engaged portions 13, which will be described later.

[0026] Each skewer portion of the skewer-shaped jig engages with the positioning engagement portion 54 of each terminal member 5, and the arrangement position of each terminal member 5 is appropriately set by the fastening member through-hole 59 and the positioning engagement portion 54 (positioning portion 53). In this state, the conductor end portion 4 of each coil 2 is joined to the conductor joint portion 51 of each terminal member 5. The positional relationship between each terminal member 5 and the stator core 1 is the same as when the stator core 1 is attached to the case CS and the terminal members 5 are fixed to the terminal block 6. Therefore, it is possible to reduce stress acting on the terminal members 5 and the coils 2 (conductor joint portion 51) when the terminal members 5 are fixed to the terminal block 6.

[0027] 2, the terminal member 5 includes a connecting portion 57 that connects the fixed portion 52 and the conductor joint portion 51. The connecting portion 57 is formed to extend along an extension direction E that connects the fixed portion 52 and the conductor joint portion 51. In the following description, the direction perpendicular to the extension direction E when viewed in the axial direction is referred to as a width direction H, with one side in the width direction H referred to as a first width direction side H1 and the other side referred to as a second width direction side H2. In addition, the positioning engaging portion 54 that forms the positioning portion 53 is disposed in the connecting portion 57.

[0028] 2, an edge 55 on the radially inner side R2 of the conductor joint portion 51 is inclined with respect to the width direction H. Furthermore, the positioning engagement portion 54 is disposed on the side farther away from the fixing portion 52 in the inclined direction of the edge 55 than the center position of the connecting portion 57 in the width direction H.

[0029] The connection portion 57 is formed by connecting the fixing portion 52 and the conductor joint portion 51 along the extension direction E. The edge 55 of the conductor joint portion 51 is inclined with respect to the width direction H perpendicular to the extension direction E, so the length of the connection portion 57 in the extension direction E varies depending on the position in the width direction H. The positioning engagement portion 54 is disposed on the side farther away from the fixing portion 52 in the inclination direction of the edge 55 relative to the center position of the connection portion 57 in the width direction H, and is therefore disposed on the side of the connection portion 57 with a longer length in the extension direction E. Therefore, the positioning engagement portion 54 can be provided so as not to interfere with both the fixation of the fixing portion 52 to the fastening portion 61 and the joining of the conductor end portion 4 to the conductor joint portion 51. That is, the fixing portion 52 can be fixed to the fastening portion 61 by the fastening member 9 with the terminal member 5 appropriately positioned by the engagement between the positioning engagement portion 54 and the engaged portion 13.

[0030] Furthermore, since the positioning engagement portion 54 is formed on the side of the connecting portion 57 that is relatively longer in the extension direction E in the width direction H, it is easy to ensure a large size for the positioning engagement portion 54 while ensuring the strength of the terminal member 5. By ensuring a large size for the positioning engagement portion 54, it is possible to reduce stress acting on the assembly jig 10 or the terminal block 6, and therefore to reduce stress acting on the positioning engagement portion 54. It is also easy to withstand a large tightening torque when tightening the fastening member 9. Furthermore, even if the positioning engagement portion 54 is formed as a through hole, for example, it is possible to reduce distortion of the terminal member 5 caused by forming the through hole, and it is easy to ensure the flatness of the fixing portion 52.

[0031] 2, the central position of the connecting portion 57 in the width direction H is biased toward the first width direction side H1, which is one side in the width direction H, with respect to the central position of the fixing portion 52 in the width direction H. The positioning engaging portion 54 is also biased toward the first width direction side H1 with respect to the central position of the connecting portion 57 in the width direction H.

[0032] Because the connecting portion 57 is positioned offset toward the first widthwise side H1 with respect to the fixing portion 52 and the positioning engaging portion 54 is also positioned offset toward the first widthwise side H1 of the connecting portion 57, the positioning engaging portion 54 is positioned offset significantly with respect to the fixing portion 52. When a fastening member through hole 59 through which the fastening member 9 passes is formed in the fixing portion 52, the shape of the fastening member through hole 59 is often circular. By being offset toward the first widthwise side H1 with respect to the fixing portion 52, the distance between the fastening member through hole 59 and the conductor joint portion 51 is increased in the connecting portion 57 where the positioning engaging portion 54 is formed. Therefore, it is easy to ensure a large size of the positioning engaging portion 54 while ensuring the strength of the terminal member 5. By ensuring a large size of the positioning engaging portion 54, stress acting on the assembly jig 10 or the terminal block 6 can be reduced, thereby reducing stress acting on the positioning engaging portion 54. Furthermore, when the fastening member 9 is tightened, it is easy to withstand a large tightening torque.

[0033] Furthermore, the positioning engaging portion 54 can be provided so as not to interfere with the fixing of the fixing portion 52 to the fastening portion 61. That is, the fixing portion 52 can be fixed to the fastening portion 61 by the fastening member 9 in a state in which the terminal member 5 is appropriately positioned by the engagement between the positioning engaging portion 54 and the engaged portion 13. Furthermore, even when the positioning engaging portion 54 is formed as a through hole, for example, distortion of the terminal member 5 caused by forming the through hole can be reduced, and the flatness of the fixing portion 52 can be easily ensured.

[0034] The positioning portion 53 (positioning engaging portion 54) has been described above, but below, a specific form of using this positioning portion 53 (positioning engaging portion 54) to position and fix the terminal member 5 relative to the terminal block 6 will be described. Fig. 4 illustrates an example of a form in which the engaged portion 13 of the assembly jig 10 used to fix the fastening portion 61 is engaged with the positioning engaging portion 54 of the positioning portion 53, and Fig. 5 illustrates an example of a form in which the engaged portion 13 provided on the terminal block 6 is engaged with the positioning engaging portion 54.

[0035] In the embodiment shown in FIG. 4 , the terminal members 5 attached to the stator St are arranged by aligning the fastening member through holes 59 of three (N pieces) terminal members 5 with three (N pieces) screw-engagement holes 69 formed in the terminal block 6 (first step). As described above, the coil 2 and the terminal members 5 are joined to the stator St so that the fastening member through holes 59 are appropriately positioned, so that the screw-engagement holes 69 and the fastening member through holes 59 can be appropriately aligned. Next, the engaged portions 13 of the assembly jig 10 are engaged with the positioning engaging portions 54 (second step). The assembly jig 10 has three (N pieces) engaged portions 13 formed at positions corresponding to the three (N pieces) positioning engaging portions 54. Next, the fastening members 9 are inserted into the screw-engagement holes 69 through the fastening member through holes 59 (third step). Then, the fastening members 9 are fastened to the screw holes 69, and the terminal members 5 are positioned and fixed relative to the terminal block 6 (fourth step). The second and third steps may be performed in the reverse order.

[0036] By engaging the engaged portion 13 with the positioning engaging portion 54, even if a rotational force is applied to the terminal member 5 when fastening the fastening member 9 into the threaded hole 69, the terminal member 5 is prevented from rotating. Therefore, the terminal member 5 can be fixed to the terminal block 6 in an appropriate posture, and stress applied to the conductor joint portion 51 of the terminal member 5 and the conductor end portion 4 of the coil 2 can be reduced.

[0037] In the embodiment shown in FIG. 5 , the terminal members 5 attached to the stator St are positioned by aligning the fastening member through holes 59 of three (N pieces) terminal members 5 with the three (N pieces) screw holes 69 formed in the terminal block 6, and engaging the positioning protrusions 63 (engaged portions 13) formed on the terminal block 6 with the respective positioning engaging portions 54 (first step). As described above, the coil 2 and the terminal members 5 are joined to the stator St so that the fastening member through holes 59 are appropriately positioned, so that the respective screw holes 69 and the fastening member through holes 59 can be appropriately aligned. Next, the fastening members 9 are inserted into the respective screw holes 69 through the respective fastening member through holes 59 (third step). Then, the fastening members 9 are fastened to the screw holes 69, and the terminal members 5 are positioned and fixed relative to the terminal block 6 (third step).

[0038] By engaging the positioning engagement portion 54 with the positioning protrusion 63 (engaged portion 13) formed on the terminal block 6, even if a rotational force is applied to the terminal member 5 when fastening the fastening member 9 into the threaded hole 69, the terminal member 5 is prevented from rotating. This allows the terminal member 5 to be fixed to the terminal block 6 in an appropriate posture, thereby reducing stress applied to the conductor joint portion 51 of the terminal member 5 and the conductor end portion 4 of the coil 2. In this embodiment shown in FIG. 5, the terminal block 6 tends to be large, but the terminal member 5 can be fixed to the terminal block 6 without using an assembly jig 10. This may be done if the size of the terminal block 6 does not hinder the miniaturization of the rotating electric machine MG and the drive device including the rotating electric machine MG and does not affect the cost of parts.

[0039] Other Embodiments Other embodiments will be described below. Note that the configurations of the embodiments described below are not limited to being applied independently, and can also be applied in combination with the configurations of other embodiments as long as no contradiction occurs.

[0040] (1) In the above, the positioning portion 53 (positioning engaging portion 54) is an example of a through-hole, but the positioning portion 53 (positioning engaging portion 54) may be a recessed portion that does not penetrate through, or may be a protruding portion. Also, in the above, the positioning engaging portion 54 is an example of a rectangular through-hole, but it is not limited to a rectangular shape and may also be a triangular shape, a circular shape, or an elliptical shape. Similarly, when the positioning portion 53 (positioning engaging portion 54) is a recessed portion or a protruding portion, its shape is not limited to a rectangular shape and may also be a triangular shape, a circular shape, or an elliptical shape.

[0041] (2) In the above example, the edge 55 of the radially inner side R2 of the conductor joint portion 51 is inclined with respect to the width direction H, and the positioning engagement portion 54 is disposed on the side farther away from the fixed portion 52 in the inclination direction of the edge 55 than the center position of the connection portion 57 in the width direction H. However, this does not preclude a configuration in which the edge 55 of the radially inner side R2 of the conductor joint portion 51 is not inclined with respect to the width direction H. Furthermore, regardless of whether or not the edge 55 is inclined, the positioning engagement portion 54 may be formed at the center position of the connection portion 57 in the width direction H.

[0042] (3) In the above example, the central position of the connecting portion 57 in the width direction H is offset toward the first width direction side H1 with respect to the central position of the fixing portion 52 in the width direction H, and the positioning engagement portion 54 is also offset toward the first width direction side H1 with respect to the central position of the connecting portion 57 in the width direction H. However, the central position of the connecting portion 57 in the width direction H may be the same as the central position of the fixing portion 52 in the width direction H. Furthermore, regardless of whether the central position of the connecting portion 57 in the width direction H is the same as or offset from the central position of the fixing portion 52 in the width direction H, the positioning engagement portion 54 may be formed at the central position of the connecting portion 57 in the width direction H. Furthermore, when the central position of the connecting portion 57 in the width direction H is offset toward the first width direction side H1 with respect to the central position of the fixing portion 52 in the width direction H, this does not preclude an embodiment in which the positioning engagement portion 54 is offset toward the second width direction side H2 with respect to the central position of the connecting portion 57 in the width direction H. Furthermore, when the central position of the connection portion 57 in the width direction H is the same as the central position of the fixing portion 52 in the width direction H, the positioning engagement portion 54 may be positioned biased toward the second width direction side H2 relative to the central position of the connection portion 57 in the width direction H.

[0043] (4) In the above example, the N (three) terminal members 5 have the same shape. However, this does not preclude at least one of the N (three) terminal members 5 from having a different shape.

[0044] (5) In the above example, the N (three) fastening portions 61 of the terminal block 6 are arranged side by side in the circumferential direction C in the axial view, and the N (three) conductor joint portions 51 are arranged side by side in the circumferential direction C on the radially outer side R1 relative to the stator core 1 in the axial view. However, all of the N (three) fastening portions 61 and the N (three) conductor joint portions 51 do not have to be arranged side by side in the circumferential direction C on the radially outer side R1 relative to the stator core 1 in the axial view. For example, it is not prevented that at least one of the N fastening portions 61 overlaps with another fastening portion 61 in the axial view, and at least one of the N terminal members 5 overlaps with another terminal member 5 in the axial view (at least one of the N conductor joint portions 51 overlaps with another conductor joint portion 51 in the axial view).

[0045] (6) In the above, an example was given of a configuration including three conductor end portions 4, three terminal members 5, and three fastening portions 61 corresponding to three-phase AC. However, N is not limited to 3, and may be "N=6" for three-phase AC when connected at two locations, or "N=6" for six-phase AC. Naturally, N may be any other natural number, such as 2, 4, 9, or 12.

[0046] (7) In the above example, N (three) terminal members 5 are arranged so as to overlap with the axial arrangement region of the stator core 1. However, this does not prevent the terminal members 5 from being arranged so as not to overlap with the axial arrangement region of the stator core 1. [Explanation of symbols]

[0047] 1: stator core, 1a: outer peripheral surface, 2: coil, 4: conductor end, 5: terminal member, 6: terminal block, 9: fastening member, 10: assembly jig, 13: engaged portion, 51: conductor joint portion, 52: fixing portion, 53: positioning portion, 54: positioning engaging portion, 55: edge, 57: connection portion, 61: fastening portion, C: circumferential direction, CS: case (support member), E: extension direction, H: width direction, H1: width direction first side, L: axial direction, MG: rotating electric machine, R: radial direction, R1: radial outer side (radial outer side), R2: radial inner side (radial inner side), St: stator (stator for rotating electric machine), T: tangent, X: axial center

Claims

1. A stator for a rotating electric machine comprising a cylindrical stator core and a coil wound around the stator core, The coil has N (N is an integer of 2 or more) conductor ends, A terminal member is attached to each of the N conductor ends, Each of the N terminal members is fixed to a fastening portion of the terminal block by a fastening member, the terminal block is fixed to a support member that supports the stator core, A direction along the axis of the stator core is defined as an axial direction, a direction perpendicular to the axis is defined as a radial direction, and a direction around the axis is defined as a circumferential direction, the N fastening portions of the terminal block are disposed radially outward with respect to the stator core as viewed in the axial direction along the axial direction, the terminal member includes a conductor joint portion to which the conductor end portion is joined, a fixing portion fixed to the fastening portion by the fastening member, and a positioning portion that is positioned relative to the terminal block, When the positioning portion is positioned with respect to the terminal block and the fixing portion is fixed to the fastening portion, the radially inner edge of the conductor joint portion is formed to follow a tangent to a portion of the outer peripheral surface of the stator core that faces the conductor joint portion, as viewed in the axial direction, an extending direction of a connecting portion connecting the fixing portion and the conductor joint portion is a direction intersecting a straight line connecting the axis and the conductor joint portion; The N conductor joint portions are arranged radially outward with respect to the stator core so as to be aligned in the circumferential direction when viewed in the axial direction, A stator for a rotating electric machine, wherein N terminal members are arranged at positions overlapping with the stator core when viewed in the radial direction.

2. the positioning portion includes a positioning engaging portion that engages with an assembly jig used to fix the fastening portion or an engaged portion provided on the terminal block, the positioning engagement portion is disposed on the connection portion, When viewed in the axial direction, a direction perpendicular to the extension direction is defined as a width direction, the radially inner edge of the conductor joint portion is inclined with respect to the width direction, 2. The stator for a rotating electric machine according to claim 1, wherein the positioning engagement portion is disposed on a side of the connecting portion that is farther away from the fixing portion in the inclined direction of the edge than a central position in the width direction of the connecting portion.

3. the positioning portion includes a positioning engaging portion that engages with an assembly jig used to fix the fastening portion or an engaged portion provided on the terminal block, the positioning engagement portion is disposed on the connection portion, When viewed in the axial direction, a direction perpendicular to the extension direction is defined as a width direction, a center position of the connection portion in the width direction is biased toward a first width direction side that is one side in the width direction with respect to a center position of the fixing portion in the width direction, 3. The stator for a rotating electric machine according to claim 1, wherein the positioning engaging portion is disposed offset toward the first widthwise side with respect to a center position in the widthwise direction of the connecting portion.

4. The N terminal members have the same shape, The stator for a rotating electric machine according to claim 1 , wherein the N fastening portions of the terminal block are arranged so as to be aligned in the circumferential direction when viewed in the axial direction.

5. The conductor constituting the coil has an insulating coating on the surface thereof, 5. The stator for a rotating electric machine according to claim 1, wherein the insulating coating is removed from the conductor end portion, and the conductor end portion is joined to the conductor joint portion by crimping or welding.

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