Rotating electric machine

Abstract

To provide a rotating electric machine that is easy to manufacture and has highly efficient stator cooling.SOLUTION: A rotating electric machine 1 has a stator core 6 in which multiple flat rectangular conductors 8 are arranged within a slot 7 while maintaining gaps therebetween, and the flat rectangular conductor 8 has a protrusion (second protruding portion 82) that protrudes in at least one direction intersecting the longitudinal direction of a straight portion of itself midway within the slot 7. According to one aspect, the flat rectangular conductors 8 each have a protrusion portion protruding in one direction (a portion extending to one side in a radial direction RD of a first protruding portion 81) and a protrusion portion protruding in the opposite direction (a portion extending to the other side in the radial direction RD of the first protruding portion 81), and gaps (inter-flat rectangular conductor flow path 21) are formed therebetween in a state of being arranged in the slot 7.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a rotating electric machine. [Background technology]

[0002] The stator of a rotating electric machine generates heat due to copper loss and iron loss. For this reason, a method of circulating a coolant inside the stator to cool it is sometimes adopted. Regarding this method, there is a proposal to provide grooves in the conductors themselves in the slots that function as flow paths for the coolant, and to directly cool the conductors with the coolant flowing through these grooves (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7139969 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the method disclosed in Patent Document 1, the area of ​​the coolant flow passage in the conductor is small, and there is a concern that the pressure loss caused by flowing the coolant may increase. If the pressure loss is large, the flow rate of the coolant is restricted, and there is a risk that the required cooling capacity may not be obtained.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide a rotating electric machine capable of reducing pressure loss in a coolant flow path and achieving high cooling efficiency for a stator. [Means for solving the problem]

[0006] (1) A rotating electric machine of the present disclosure (e.g., rotating electric machine 1 described later) is a rotating electric machine having a stator core (e.g., stator core 6 described later) in which a plurality of rectangular conductors (e.g., rectangular conductor 8 described later) are arranged in a slot (e.g., slot 7 described later) while maintaining a gap between them, and the rectangular conductors have a protrusion (e.g., second protruding portion 82 described later) protruding in at least one direction intersecting the longitudinal direction of the straight portion midway within the slot.

[0007] (2) The rotary electric machine of (1) above, in which the flat rectangular conductors have a protrusion protruding in the one direction (for example, a portion extending to one side in the radial direction RD of the first protruding shape portion 81 described later) and a protrusion protruding in the opposite direction to the one direction (for example, a portion extending to the other side in the radial direction RD of the first protruding shape portion 81 described later), and when arranged in the slot, gaps (for example, a flow path 21 between the flat rectangular conductors described later) are formed between them. Effect of the Invention

[0008] In the rotating electric machine of (1) above, the rectangular conductor has a protrusion that protrudes in at least one direction intersecting the longitudinal direction of the straight portion in the middle of its own straight portion in the slot. This creates a gap between the slot (including insulating materials such as insulating paper) and the rectangular conductor, reliably forming the coolant flow path, reducing pressure loss in the coolant flow path, and improving the cooling efficiency of the rectangular conductor.

[0009] In the rotating electric machine of (2) above, the rectangular conductors have protrusions that protrude in one direction and protrusions that protrude in the opposite direction, and are arranged in a slot with gaps formed between them. This ensures a coolant flow path between the rectangular conductors, and the coolant flowing through this coolant flow path promotes cooling of the rectangular conductors. [Brief description of the drawings]

[0010] [Figure 1] 1 is a conceptual diagram of a coolant circulation mechanism in a rotating electric machine according to an example of the present disclosure. [Diagram 2] 2 is a diagram showing, as viewed in the axial direction, how a stator coil is configured by arranging rectangular conductors in slots of a stator core in the rotating electric machine of FIG. 1. FIG. [Diagram 3] 3 is a diagram showing an arrangement of rectangular conductors in the slots of FIG. 2 as viewed in the circumferential direction of the rotating electric machine. [Figure 4] 4 is a diagram showing an arrangement of the rectangular conductors in the slots of FIG. 3 as viewed in the radial direction of the rotating electric machine. FIG. [Figure 5A] 4 is a perspective view seen from one direction of a state in which protrusions are provided midway along straight sections of a plurality of flat rectangular conductors in FIG. 3. FIG. [Figure 5B] 5B is a perspective view showing how protrusions are provided midway through straight portions of a plurality of rectangular conductors in FIG. 3, as viewed from the opposite direction to FIG. 5A. FIG. [Figure 6] 3 is a perspective view showing the shapes and arrangement of the plurality of rectangular conductors in FIG. 2 as seen through a stator core. FIG. [Figure 7A] 7 is a diagram showing the shapes of the plurality of rectangular conductors and the arrangement of insulating members in FIG. 6 as viewed in the direction of the arrow A. FIG. [Figure 7B] 7 is a diagram showing the shapes of the plurality of rectangular conductors and the arrangement of insulating members in FIG. 6 as viewed in the direction of the arrow B. FIG. [Figure 8] 7 is a perspective view showing the shape and arrangement of a plurality of rectangular conductors in FIG. 2 as seen through a stator core in a direction of an arrow different from that in FIG. 6. FIG. [Figure 9A] 9 is a diagram showing the shapes of the plurality of rectangular conductors and the arrangement of insulating members in FIG. 8 as viewed in the direction of the arrow A. FIG. [Figure 9B] 9 is a diagram showing the shapes of the plurality of rectangular conductors and the arrangement of insulating members in FIG. 8 as viewed in the direction of the arrow B. FIG. [Figure 10] 5 is a diagram showing the cross-sectional area of ​​a coolant flow path secured around the rectangular conductor of FIG. 3 and FIG. 4 at a plurality of positions in the longitudinal direction of the rectangular conductor. FIG. [Figure 11] 11A to 11C are cross-sectional views showing the coolant flow paths at a number of positions in FIG. 10. [Figure 12] 5 is a diagram showing an arrangement of rectangular conductors different from those in FIGS. 3 and 4 as viewed in the circumferential direction of a rotating electric machine. FIG. [Figure 13] 13 is a diagram showing the arrangement of the rectangular conductors in the slots of FIG. 12 as viewed in the radial direction of the rotating electric machine. FIG. [Figure 14A] 13 is a perspective view showing the uneven shape of the straight line portions of the plurality of rectangular conductors in FIG. 12 as viewed from one direction. [Figure 14B] 14B is a perspective view showing the uneven shape of the straight line portions of the plurality of rectangular conductors in FIG. 12, as viewed from the opposite direction to that in FIG. 14A. [Figure 15] 13 is a perspective view showing the shapes and arrangement of the plurality of rectangular conductors in FIG. 12 as seen through a stator core. FIG. [Figure 16A] 16 is a diagram showing the shapes of the plurality of rectangular conductors and the arrangement of insulating members in FIG. 15 as viewed in the direction of the arrow A. FIG. [Figure 16B] 16 is a diagram showing the shapes of the plurality of rectangular conductors and the arrangement of insulating members in FIG. 15 as viewed in the direction of the arrow B. FIG. [Figure 17] FIG. 16 is a diagram for defining different arrow views using a perspective view similar to FIG. [Figure 18A] 18 is a diagram showing the shapes of the plurality of rectangular conductors and the arrangement of insulating members in FIG. 17 as viewed in the direction of the arrow A. FIG. [Figure 18B] 18 is a diagram showing the shapes of the plurality of rectangular conductors and the arrangement of insulating members in FIG. 17 as viewed in the direction of the arrow B. FIG. [Figure 19] 14 is a diagram showing the cross-sectional area of ​​a coolant flow path secured around the rectangular conductor of FIG. 12 and FIG. 13 at a plurality of positions in the longitudinal direction of the rectangular conductor. FIG. [Figure 20] 20A to 20C are cross-sectional views showing the coolant flow paths at a number of positions in FIG. 19. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The rotating electric machine of the present disclosure will be described below with reference to the drawings. In each of the drawings shown below, the same reference numerals are used for corresponding parts. In addition, in the drawings showing directions, AD indicates the axial direction of the rotating electric machine, CD indicates the circumferential direction of the rotating electric machine, and RD indicates the radial direction of the rotating electric machine.

[0012] Fig. 1 is a conceptual diagram of a coolant circulation mechanism in a rotating electric machine 1 according to an example of the present disclosure. In Fig. 1, the rotating electric machine 1 includes a rotor 2 and a stator 3. The rotor 2 is cylindrical, and the stator 3, which has an annular cross section, is disposed around the rotor 2 with a predetermined gap therebetween.

[0013] A casing 4 is provided in contact with the outer periphery of the stator 3, forming the outer shell of the rotating electric machine 1. A rotating shaft 5 passes through the center of rotation of the rotor 2, and the rotating shaft 5 is supported by bearings (not shown) at both axial end surfaces of the casing 4. A plurality of slots 7 are arranged at equal intervals in the circumferential direction in a stator core 6 of the annular stator 3. A plurality of rectangular conductors 8 are arranged in each of the plurality of slots 7. The rectangular conductors (square conductors) 8, each having a rectangular cross section, are electrically connected to form a stator coil 9 arranged in the stator core 6. An insulating member 11 is arranged along an inner wall surface 10 of each of the plurality of slots 7. As the insulating member 11, for example, insulating paper having a foamed adhesive layer on one side and a non-foamed adhesive layer on the other side, or insulating paper having foamed adhesive layers on both sides, etc. are applied. The adhesive layer is applied to the entire surface of the insulating paper, and only the portion in contact with the conductor is adhered. The adhesive layer may be formed only in the corresponding portion.

[0014] The rotating electric machine 1 generates heat due to copper loss and iron loss, but the stator core 6 and the stator coil 9 are cooled by the coolant circulating through the coolant flow passage 12 formed in the stator 3, which will be described later. For example, ATF (automatic transmission fluid) is used as the coolant. The coolant discharged from the coolant reservoir 13 provided in the casing 4 is supplied to the suction side of the pump 15 through a filter 14. This coolant is cooled by heat exchange with the coolant flowing through the external coolant flow passage 17 in a heat exchanger 16 provided on the delivery side of the pump 15, and is supplied to the coolant supply port 19 of the stator core 6 through a coolant supply passage 18. The coolant supplied to the stator core 6 flows while cooling the stator core 6 and the conductors 8 in the slots 7 through a route described later, and is collected in the coolant reservoir 13, where it is repeatedly recirculated.

[0015] FIG. 2 is a view showing, in an axial direction, how the flat conductors 8 are arranged in the slots 7 of the stator core 6 in the rotating electric machine 1 in FIG. 1 to form a stator coil 9. FIG. 3 is a view showing the arrangement of the flat conductors 8 in the slots 7 in FIG. 2 as viewed in the circumferential direction of the rotating electric machine 1. FIG. 4 is a view showing the arrangement of the flat conductors 8 in the slots 7 in FIG. 3 as viewed in the radial direction of the rotating electric machine 1. The parts of the flat conductors 8 shown in FIG. 3 and FIG. 4 are straight parts arranged in the slots 7 along the axial direction of the rotating electric machine 1. The ends of the straight parts of the flat conductors 8 are electrically connected according to a predetermined rule to form the stator coil 9 of the rotating electric machine 1. The flat conductors 8 are covered with an insulating coating, like general flat conductors of this type. The inventors have verified that even if the flat conductors 8 are partially deformed by applying pressure with a press or the like to form a convex portion as described later, no damage is caused to the insulating coating.

[0016] A gap is provided between the surface of the rectangular conductor 8 and the inner wall surface 10 of the slot 7 by a structure described later. This gap forms a slot inner wall side flow path 20, which is a flow path for the coolant between the surface of the rectangular conductor 8 and the inner wall surface 10 of the slot 7. In addition, a gap is provided between the rectangular conductors 8 by a structure described later. This gap forms an inter-rectangular conductor flow path 21, which is a flow path for the coolant between the rectangular conductors 8.

[0017] The shape of the rectangular conductor 8 will be described with reference to Figs. 3 and 4, and further Figs. 5A and 5B. Fig. 5A is a perspective view of the rectangular conductors in Fig. 3, in which protrusions are provided in the middle of the straight parts. Fig. 5B is a perspective view of the rectangular conductors in Fig. 3, in which protrusions are provided in the middle of the straight parts, from the opposite direction to Fig. 5A. The rectangular conductor 8 includes a normal shape portion 80, a first protruding shape portion 81, and a second protruding shape portion 82. The normal shape portion 80 is the name of a portion that does not have any protruding portion in a direction intersecting the longitudinal direction over the entire length of its longitudinal section, and the cross section of each portion maintains a constant rectangular shape.

[0018] In the straight portion located in the slot 7 of the rectangular conductor 8, a first protruding portion 81 and a second protruding portion 82 are provided midway in the extension direction of the normal shaped portion 80. The first protruding portion 81 has a protruding portion that protrudes further in the radial direction RD than the normal shaped portion 80. The second protruding portion 82 has a protruding portion that protrudes further in the circumferential direction CD than the normal shaped portion 80. The surface of the first protruding portion 81 facing the circumferential direction CD is more recessed than the surface of the normal shaped portion 80 facing the same direction. The surface of the second protruding portion 82 facing the radial direction RD is more recessed than the surface of the normal shaped portion 80 facing the same direction.

[0019] That is, from the viewpoint of FIG. 3, when viewed from the outer surface of the normal shaped portion 80 as a reference, each of the multiple (three in FIG. 3) first protruding portions 81 is a recess, and each of the multiple (two in FIG. 3) second protruding portions 82 is a protrusion. Also, from the viewpoint of FIG. 4, when viewed from the outer surface of the normal shaped portion 80 as a reference, each of the multiple (three in FIG. 3) first protruding portions 81 is a protrusion, and each of the multiple (two in FIG. 3) second protruding portions 82 is a recess. The relationship between the above-mentioned protrusions and recesses, and the unevenness of the outer surface of the normal shaped portion 80 can be easily understood by referring to FIG. 5A and FIG. 5B. That is, the first protruding portion 81 forms a protrusion in the radial direction RD and a recess in the circumferential direction CD. Also, the second protruding portion 82 forms a recess in the radial direction RD and a protrusion in the circumferential direction CD.

[0020] An insulating member 11 is arranged along the inner wall surface 10 of each of the multiple slots 7 to maintain electrical insulation between the rectangular conductors 8. As shown in Fig. 3, insulating paper as the insulating member 11 is arranged between the rectangular conductors 8 on the radially outermost side in the slots 7 and the inner wall surface 10, and between the rectangular conductors 8 on the radially innermost side in the slots 7 and the inner wall surface 10. As shown in Fig. 4, insulating paper as the insulating member 11 is arranged between the rectangular conductors 8 and two inner wall surfaces 10 spaced apart in the circumferential direction in the slots 7.

[0021] 3, the circumferentially outer surface of the first protruding portion 81 of the rectangular conductor 8 located on the outermost side in the slot 7 protrudes in the radial direction RD further than the surfaces of the normal portion 80 and the second protruding portion 82 facing the radial direction RD. This protruding portion is in contact with the insulating paper, which is the insulating member 11, via the adhesive layer 11a. The adhesive layer 11a bonds the insulating paper and the rectangular conductor 8 at the second protruding portion 82.

[0022] 4, the two faces of the second protruding portion 82 of the rectangular conductor 8 facing the circumferential direction CD protrude in the circumferential direction CD further than the faces of the normal portion 80 and the first protruding portion 81 facing the circumferential direction CD. These protruding portions are in contact with the insulating paper, which is the insulating member 11, via an adhesive layer 11a. The adhesive layer 11a bonds the insulating paper and the rectangular conductor 8 at the second protruding portion 82.

[0023] 3, the respective portions of the rectangular conductor 8 corresponding to the recesses and the normal shaped portion 80 overlap and come into contact with the respective portions of the rectangular conductor 8 corresponding to the protrusions, forming gaps between the respective portions of the rectangular conductor 8 corresponding to the recesses and the normal shaped portion 80 between adjacent rectangular conductors 8. These gaps form inter-rectangular conductor flow paths through which the coolant flows. As will be described next with reference to FIG. 4, a slot inner wall side flow path 20 is formed on the side intersecting the paper plane of FIG. 3, i.e., on the surface facing the circumferential direction CD.

[0024] 4, the respective portions of the rectangular conductor 8 corresponding to the recesses and the normal shaped portion 80 are in contact with the inner wall surface 10 of the slot 7 at the portions corresponding to the protrusions, forming gaps between the inner wall surface 10 and the recesses. These gaps form the slot inner wall side flow paths 20 through which the coolant flows. Strictly speaking, the portions corresponding to the protrusions are in contact with the inner wall surface 10 of the slot 7 via the adhesive layer 11a and the insulating paper which is the insulating member 11, but for convenience, the relationship between the protrusions and the inner wall surface 10 will be described below as appropriate.

[0025] Here, the slot inner wall side flow passage 20 will be further described with reference to FIG. 6. FIG. 6 is a perspective view showing the shape and arrangement of the flat rectangular conductors in FIG. 2, seen through the stator core 6. In FIG. 6, the position of the slot inner wall side flow passage 20 is indicated by a dotted arrow in both directions. The slot inner wall side flow passage 20 is formed as a gap between the insulating paper, which is the insulating member 11, in the slot 7 in the stator core 6 and each part of the flat rectangular conductor 8 corresponding to the above-mentioned recess. In FIG. 6, a surface seen in the direction of the arrow B in the circumferential direction CD inside the slot 7 is seen through. Three slot inner wall side flow passages 20 are formed in the radial direction RD as a gap between the surface on the concave side of the first protruding shape portion 81 described above and the inner wall surface 10 of the slot 7. Similarly, two slot inner wall side flow passages 20 are formed in the circumferential direction CD between the recess and the inner wall surface of the second protruding shape portion 82 on the outermost peripheral side in the slot 7.

[0026] Next, the bonding form between the flat angle conductor 8 and the insulating member 11 will be described with reference to FIG. 7A and FIG. 7B. FIG. 7A is a view showing the shape of the flat angle conductors and the arrangement of the insulating members in FIG. 6 as viewed from the direction of the arrow A. FIG. 7B is a view showing the shape of the flat angle conductors and the arrangement of the insulating members in FIG. 6 as viewed from the direction of the arrow B. The flat angle conductor 8 and the insulating member 11 are bonded to each other by an adhesive layer 11a disposed between the flat angle conductor 8 and the insulating paper, which is the insulating member 11, at predetermined positions discretely set on the surface of the flat angle conductor 8. The second protruding portion 82 in the viewpoint of FIG. 7A forms a convex portion facing the insulating member 11, and this convex portion becomes an adhesive surface Sa that is bonded to the insulating paper, which is the insulating member 11, by the adhesive layer 11a. In contrast, the second protruding portion 82 in the viewpoint of FIG. 7B forms a convex portion facing the insulating member 11, but this convex portion becomes a non-adhesive surface Sn that is not bonded to the insulating paper.

[0027] Next, referring to Fig. 8, Fig. 9A, Fig. 9B, Fig. 10 and Fig. 11, the form of the coolant flow path formed around the rectangular conductor 8 in the slot 7 will be described. Fig. 8 is a perspective view showing the shape and arrangement of the rectangular conductors in Fig. 2 by seeing through the stator core in a different arrow direction from Fig. 6. Fig. 9A is a view showing the shape of the rectangular conductors in Fig. 8 and the arrangement of the insulating members in the direction of the arrow A. Fig. 9B is a view showing the shape of the rectangular conductors in Fig. 8 and the arrangement of the insulating members in the direction of the arrow B. Fig. 10 is a view showing the cross-sectional area of ​​the coolant flow path secured around the rectangular conductors in Figs. 3 and 4 at multiple positions in the longitudinal direction of the rectangular conductors. Fig. 11 is a cross-sectional view showing the coolant flow path at each of multiple positions in Fig. 10. With regard to Fig. 8, the parts with the same reference numerals as those described with reference to Fig. 6 are referred to in the description already given with reference to Fig. 6.

[0028] In Fig. 8, the slot inner wall side flow passage 20 is formed as a gap between the insulating paper, which is the insulating member 11, and each portion of the rectangular conductor 8 corresponding to the above-mentioned recess. The rectangular conductor inter-flow passage 21 is formed as a gap between each portion of the adjacent rectangular conductors 8 corresponding to the above-mentioned recess and between the normal shaped portions 80. As can be easily understood by referring to Fig. 8 together with Figs. 9A and 9B, the slot inner wall side flow passage 20 and the rectangular conductor inter-flow passage 21, which are the coolant flow passages formed around the rectangular conductor 8 in the slot 7, are formed vertically and horizontally in the radial direction RD and the axial direction AD, and the coolant flows, for example, from one end side to the other end side in the axial direction AD of the rectangular conductor 8 in the slot 7, when viewed as a whole.

[0029] FIG. 10 shows points to be calculated (measured) when simulating the cross-sectional area of ​​the coolant flow path from one end to the other end in the axial direction AD when the coolant flow path is viewed as a whole as described above. In FIG. 10, there are four points P1, P2, P3, and P4, which are set discretely and sequentially from one end to the other end in the axial direction AD of the rectangular conductor 8. FIG. 11 shows the cross sections of the coolant flow path at these four points. The simulation values ​​for the cross-sectional area of ​​the coolant flow path are generally high from points P1 to P4. That is, when the cross-sectional area of ​​the coolant flow path when a rectangular conductor that does not have a protruding portion specially provided according to a predetermined rule, such as the rectangular conductor 8 of the present disclosure, is used as a reference value, in the example of FIG. 10, the cross-sectional area of ​​the coolant flow path generally obtained a value approximately 1.8 times this reference value. In detail, the value was approximately 1.8 times the reference value at point P1, and the values ​​at points P2 and P4 were higher than those at point P1. At point P3, the value was slightly lower than at point P1, but overall, as described above, the value was approximately 1.8 times the reference value, and the coolant flow path of the present disclosure is extremely excellent.

[0030] Next, referring to Fig. 12, Fig. 13, Fig. 14A and Fig. 14B, the coolant flow path in the case where a flat rectangular conductor 8 having another shape is applied will be described. Fig. 12 is a view showing a state in which a concave-convex rod-shaped conductor 83 as a flat rectangular conductor 8 different from those in Fig. 3 and Fig. 4 is arranged in a slot 7 as viewed in the circumferential direction (CD direction) of the rotating electric machine 1. Fig. 13 is a view showing a state in which the concave-convex rod-shaped conductor 83 in Fig. 12 is arranged in the slot 7 as viewed in the radial direction (RD direction) of the rotating electric machine. Fig. 14A is a perspective view showing the concave-convex shape of a plurality of concave-convex rod-shaped conductors 83 in Fig. 12 from one direction. Fig. 14B is a perspective view showing the concave-convex shape of the straight parts of a plurality of concave-convex rod-shaped conductors 83 in Fig. 12 from the opposite direction to Fig. 14A.

[0031] 12 and 13, two protruding portions 831 protrude from the front side of the circumferential direction CD (the front side of the paper), and these portions are bonded to the insulating paper, which is the insulating member 11, via the adhesive layer 11a. Flat step portions 834 are formed adjacent to both sides of each protruding portion 831 in the axial direction AD, and are not in contact with the insulating member 11 with a gap therebetween. As can be easily understood by referring to both FIG. 14A and FIG. 14B, the rear side corresponding position of each protruding portion 831 forms a recess 822. Three protruding portions 835 are formed on the outer surface of the outermost peripheral side of the protruding portion 83 in the radial direction RD, and are spaced apart in the axial direction. The protruding portions 835 form gaps between the insulating member 11 and the portions of the protruding portion 83 of the protruding portion 83 other than the protruding portion 835 of the protruding portion 83 and the slot inner wall side flow passage 20.

[0032] Here, the slot inner wall side flow passage 20 will be further described with reference to FIG. 15. FIG. 15 is a perspective view showing the shape and arrangement of the plurality of rectangular conductors in FIG. 2, with the stator core 6 seen through. In FIG. 15, the position of the slot inner wall side flow passage 20 is indicated by a dotted arrow. The slot inner wall side flow passage 20 is formed as a gap between the insulating paper, which is the insulating member 11, in the slot 7 in the stator core 6, and each portion of the concave-convex rod-shaped conductor 83, which is the rectangular conductor 8, which corresponds to the above-mentioned concave portion. In FIG. 15, a surface in the slot 7 seen in the direction of the arrow B in the circumferential direction CD is seen through. Three slot inner wall side flow passages 20 are formed in the radial direction RD as gaps between the concave side surface of the first protruding shape portion 81 described above and the flat step portion 334 and the inner wall surface 10 of the slot 7. Similarly, two slot inner wall side flow passages 20 are formed in the circumferential direction CD between the concave side of the second protruding shape portion 82 on the outermost peripheral side in the slot 7 and the inner wall surface.

[0033] Next, the bonding form between the rectangular conductor 8 and the insulating member 11 will be described with reference to Fig. 16A and Fig. 16B. Fig. 16A is a diagram showing the arrangement of the plurality of concave-convex rod-shaped conductors 83 and the insulating member in Fig. 15 as viewed in the direction of the arrow A. Fig. 7B is a diagram showing the shape of the plurality of rectangular conductors and the arrangement of the insulating member in Fig. 15 as viewed in the direction of the arrow B. The concave-convex rod-shaped conductor 83 and the insulating member 11 are bonded to each other by an adhesive layer 11a disposed between the concave-convex rod-shaped conductor 83 and the insulating member 11 at predetermined positions discretely set on the surface of the concave-convex rod-shaped conductor 83 and the insulating member 11. The adhesive surface portion 833 in the viewpoint of Fig. 7A forms a convex portion facing the insulating member 11, and this convex portion is bonded to the insulating member 11 as the insulating member 11 by the adhesive layer 11a. In contrast, the convex portion 831 in the viewpoint of Fig. 7B forms a convex portion facing the insulating member 11, but this convex portion becomes a non-bonding surface Sn that is not bonded to the insulating paper.

[0034] Next, referring to Figs. 17, 18A, 18B, 19, and 20, the form of the coolant flow path formed around the concave-convex rod-shaped conductor 83 as the flat-angle conductor 8 in the slot 7 will be described. Fig. 17 is a perspective view showing the shape and arrangement of the flat-angle conductors in Fig. 2, seen through the stator core in a direction of an arrow different from that in Fig. 15. Fig. 18A is a view showing the shape of the concave-convex rod-shaped conductor 83 as the flat-angle conductors 8 in Fig. 17 and the arrangement of the insulating members as seen in the direction of an arrow A. Fig. 18B is a view showing the shape of the flat-angle conductors in Fig. 17 and the arrangement of the insulating members as seen in the direction of an arrow B. Fig. 19 is a view showing the cross-sectional area of ​​the coolant flow path secured around the flat-angle conductor in Figs. 12 and 13 at multiple positions in the longitudinal direction of the concave-convex rod-shaped conductor 83 as the flat-angle conductor 8. Fig. 20 is a cross-sectional view showing the coolant flow path at multiple positions in Fig. 19. 17, the same reference numerals as those in FIG. 15 denote the same parts as those in FIG. 15. The same reference numerals as those in FIG.

[0035] In Fig. 17, the slot inner wall side flow passage 20 is formed as a gap between the insulating paper, which is the insulating member 11, and each portion of the concave-convex rod-shaped conductor 83, which is the rectangular conductor 8, which corresponds to the above-mentioned recess. The rectangular conductor inter-flow passage 21 is formed as a gap between each portion of the adjacent rectangular conductors 8, which corresponds to the above-mentioned recess, and between the normal shaped portions 80. As can be easily understood by referring to Fig. 17 together with Fig. 18A and Fig. 18B, the slot inner wall side flow passage 20 and the rectangular conductor inter-flow passage 21, which are the coolant flow passages formed around the rectangular conductor 8 in the slot 7, are formed vertically and horizontally in the radial direction RD and the axial direction AD, and the coolant flows, for example, from one end side to the other end side in the axial direction AD of the rectangular conductor 8 in the slot 7.

[0036] FIG. 19 shows points to be calculated (measured) when simulating the cross-sectional area of ​​the coolant flow path from one end side to the other end side in the axial direction AD when the coolant flow path is viewed as a whole as described above. In FIG. 19, there are four points P1, P2, P3, and P4, which are set discretely and sequentially from one end side to the other end side in the axial direction AD of the rectangular conductor 8. FIG. 20 shows the cross-sections of the coolant flow path at these four points. The simulation values ​​for the cross-sectional area of ​​the coolant flow path are generally high from points P1 to P4. That is, when the cross-sectional area of ​​the coolant flow path when a rectangular conductor that does not have a protruding portion specially provided according to a predetermined rule, such as the rectangular conductor 8 of the present disclosure, is used as a reference value, in the example of FIG. 19, the cross-sectional area of ​​the coolant flow path generally obtained a value approximately 1.4 times this reference value. In detail, the value was approximately 1.4 times the reference value at point P1, and the values ​​at points P2 and P4 were higher than those at point P1. At point P3, the value was slightly lower than at point P1, but overall, as described above, the value was approximately 1.4 times the reference value, and the coolant flow path of the present disclosure is extremely excellent. The rotating electric machine according to the present disclosure described above can be summarized as follows.

[0037] (1) A rotating electric machine having a stator core 6 in which a plurality of flat rectangular conductors 8 are arranged within a slot 7 while maintaining a gap between them, wherein the flat rectangular conductor 8 has a protrusion that protrudes in at least one direction intersecting the longitudinal direction of the straight portion in the middle of its straight portion within the slot 7, the protrusion being a portion that protrudes in the circumferential direction CD in a second protruding shape portion 82 further than a normal shape portion 80.

[0038] In the rotating electric machine 1 of the above embodiment (1), the rectangular conductor 8 has a protrusion that protrudes in at least one direction intersecting the longitudinal direction of the straight portion in the middle of its own straight portion in the slot 7. This creates a gap between the slot 7 (including the insulating member 11 such as insulating paper) and the rectangular conductor 8, reducing pressure loss in the coolant passage and improving the cooling efficiency of the rectangular conductor 8.

[0039] (2) In one embodiment of the rotating motor 1 of the present disclosure, the flat rectangular conductor 8 has a first protruding portion 81 as a protruding portion protruding in one direction, which extends to one side in the radial direction RD, and a first protruding portion 81 as a protruding portion protruding in the opposite direction to the one direction, which extends to the other side in the radial direction RD, and when arranged in the slot 7, a flow path 21 between the flat rectangular conductors is formed as a gap between them.

[0040] In the rotating electric machine 1 of the above embodiment (2), the rectangular conductors 8 have protrusions protruding in one direction and protruding in the opposite direction, and gaps are formed between them when they are arranged in the slot 7. Therefore, inter-rectangular conductor flow paths 21 are secured between the rectangular conductors 8, and the cooling of the rectangular conductors 8 is promoted by the cooling liquid flowing through the inter-rectangular conductor flow paths 21.

[0041] Although one embodiment of the rotating electric machine of the present disclosure has been described above, the technical idea of ​​the present disclosure is not limited to this. The detailed configuration may be appropriately changed within the scope of the technical idea of ​​the present disclosure. For example, instead of the projection formed on the rectangular conductor 8 protruding in a rectangular shape, the projection may protrude in a rounded shape. [Explanation of symbols]

[0042] Sa...adhesive surface Sn…Non-adhesive surface 1...Rotary electric machine 2. Rotor 3…Stator 4…Casing 5…Rotation axis 6…Stator core 7. Slot 8...Rectangular conductor 8N…Normal shape part 8S…Specific shape part 9…Stator coil 10…Inner wall surface 11...Insulating material (insulating paper) 11a…adhesive layer 12…Cooling liquid flow path 13...Coolant reservoir 14…Filter 15…Pump 16...Heat exchanger 17…External coolant flow path 18…Cooling liquid supply path 19…Cooling liquid supply port 20: Slot inner wall side flow passage 21...Flow passage between rectangular conductors 80…Normal shape part 81...first protruding shape part 82...Second protruding shape part 83...Concave-convex rod conductor 831…Convex part 832…Recess 833...Adhesive surface part 834…Flat step part 835…Convex part

Claims

1. A rotating electric machine having a stator core in which a plurality of rectangular conductors are arranged in slots while maintaining a gap between them, A rotating electric machine in which the flat rectangular conductor has a protrusion that protrudes in at least one direction intersecting the longitudinal direction of the straight portion midway within the slot.

2. The rotating electric motor of claim 1, wherein the rectangular conductor has a protrusion protruding in one direction and a protrusion protruding in a direction opposite to the one direction, and a gap is formed between the protrusions when arranged in the slot.

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