Rotating Electric Machine

Abstract

To provide a rotary electric machine that is improved in cooling performance.SOLUTION: According to an embodiment, a rotary electric machine comprises a stator 12 which has a stator iron core 24 and a stator coil 26, a first bracket 16 which covers one end face of the stator iron core, a second bracket 18 which covers the other end face of the stator iron core, and a rotor 28. A first flow passage formation part 40 provided at an outer periphery of the stator iron core has a first flow passage F1 extending from one axial end to the other end of the stator iron core and a second flow passage F2 which is provided radially outside the first flow passage and extends from the one axial end to the other end of the stator iron core. The first bracket has an annular peripheral wall 16a which has an opening end opposed to the one end face of the stator iron core, a bottom wall 16b opposed to the one end face of the stator iron core at an interval, and a second flow passage formation part 48 which is formed of a part of the peripheral wall. The second flow passage formation part has an outside air flow passage RA and an inside flow passage RI.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] An embodiment of the present invention relates to a rotating electric machine. [Background technology]

[0002] In recent years, permanent magnet type rotating electric machines in which permanent magnets are arranged on the magnetic poles of the rotor have been proposed. In addition, rotating electric machines for driving vehicles are required to be compact and have high output. As the output increases, the temperature rise of the stator coil and the permanent magnets can become a problem. Therefore, it is necessary to improve the cooling performance of the rotating electric machine. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-177017 A [Patent Document 2] JP 2007-020257 A [Patent Document 3] JP 2006-101658 A Summary of the Invention [Problem to be solved by the invention]

[0004] An object of an embodiment of the present invention is to provide a rotating electric machine with improved cooling performance. [Means for solving the problem]

[0005] According to an embodiment, a rotating electric machine includes a stator having a cylindrical stator core having a first end face located at one end in the axial direction and a second end face located at the other end in the axial direction, and an outer circumferential surface, a stator coil attached to the stator core, and a first flow path forming portion provided on the outer periphery of the stator core and forming a first flow path extending from one end to the other end in the axial direction of the stator core and a second flow path located outside the first flow path in the radial direction of the stator core and extending from one end to the other end in the axial direction of the stator core, a first bracket having an annular peripheral wall having an open end facing the first end face, a bottom wall facing the first end face at a distance, and a second flow path forming portion formed by a part of the peripheral wall, and a second bracket having an annular peripheral wall having an open end facing the second end face, and a bottom wall facing the second end face at a distance.The second flow path forming portion of the first bracket includes a first end wall extending radially from the opening end of the peripheral wall and having a circumferential width, a pair of first side walls extending in the axial direction from one end and the other end of the first end wall to the bottom wall, respectively, and erected in the radial direction and facing each other at a distance in the circumferential direction, a first bottom wall located between the pair of first side walls, extending in the axial direction from an end portion of the first end wall on the opening end side to the bottom wall and having a first width in the circumferential direction, a first partition wall located between the pair of first side walls, extending in the axial direction from the first end wall to the bottom wall, having a first width in the circumferential direction, and facing the first bottom wall at a distance in the radial direction, and a first ceiling wall located between the pair of first side walls, extending in the axial direction from an end portion of the first end wall on the extending side to the bottom wall, having a first width in the circumferential direction, and facing the first partition wall at a distance in the radial direction. a first outlet formed in the first end wall, having a predetermined width in the circumferential direction, facing one end of the first flow passage; a second outlet formed in the first end wall, having a predetermined width in the circumferential direction, located radially outward from the first outlet and facing one end of the second flow passage; a first inlet formed in the first bottom wall, located adjacent to the bottom wall, and having a first width in the circumferential direction; a second inlet formed in the first bottom wall, located on the first end wall side of the first inlet, and having a second width in the circumferential direction smaller than the first width; a flow port formed in the first partition wall, located opposite the second inlet, and having a third width in the circumferential direction smaller than the first width; and a cylindrical second partition wall located between the first bottom wall and the first partition wall, having one end connected to the first bottom wall and located around the second inlet, and the other end connected to the first partition wall and located around the flow port. The first bottom wall, the first partition, the pair of first side walls, and the second partition form an outside air flow path connecting the first inlet and the first outlet, and the first partition, the first ceiling wall, the pair of first side walls, and the second partition form an inside air flow path connecting the second inlet and the second outlet. [Brief description of the drawings]

[0006] [Figure 1]FIG. 1 is a perspective view showing the appearance of a rotating electric machine according to an embodiment. [Diagram 2] FIG. 2 is an exploded perspective view of the rotating electric machine, showing a first bracket and a cover plate in an exploded state. [Diagram 3] 3 is a cross-sectional view of the rotating electric machine taken along line AA in FIG. [Figure 4] 4 is a cross-sectional view of a first bracket portion taken along line CC in FIG. 3; [Diagram 5] 5 is a cross-sectional view of a first bracket portion taken along line DD in FIG. 3; FIG. [Figure 6] 6 is a cross-sectional view of the rotating electric machine taken along line BB in FIG. [Figure 7] FIG. 7 is a cross-sectional view of the rotating electric machine, showing a partial vertical cross section of the rotating electric machine. [Figure 8] FIG. 8 is a perspective view illustrating an outside air flow path and an inside air flow path of a first bracket. [Figure 9] 9 is a perspective view including a cross section of the flow passage forming portion taken along line FF in FIG. 8. FIG. [Figure 10] 10 is a perspective view including a cross section of the flow passage forming portion taken along line GG in FIG. 8. FIG. [Figure 11] 11 is a perspective view including a cross section of the flow passage forming portion taken along line HH in FIG. 8. FIG. [Figure 12] 12 is a cross-sectional view of the second bracket portion taken along line E--E in FIG. 3; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the same reference numerals are used to designate common components throughout the embodiments, and duplicated descriptions will be omitted. Each figure is a schematic diagram for facilitating understanding of the embodiment, and the shape, dimensions, ratios, etc. may differ from those of the actual device, but these may be appropriately modified in design by taking into consideration the following description and known techniques.

[0008] (Embodiment) Fig. 1 is a perspective view showing an appearance of a rotating electric machine according to an embodiment, Fig. 2 is an exploded perspective view of the rotating electric machine with a first bracket and a cover plate disassembled, and Fig. 3 is a cross-sectional view of the rotating electric machine taken along line AA in Fig. 1. In the following description, the direction of a central axis C1 of the rotating electric machine is referred to as the axial direction, a direction perpendicular to the central axis C1 is referred to as the radial direction, and a direction going around the central axis C1 is referred to as the circumferential direction. As shown in Fig. 1 and Fig. 2, the rotating electric machine 10 is configured as a so-called fully enclosed type rotating electric machine. The rotating electric machine 10 includes a stator 12, a first core holder 14a fixed to one axial end face of the stator 12, a second core holder 14b fixed to the other axial end face of the stator 12, a bowl-shaped first bracket 16 fixed to the first core holder 14a and covering one end side (drive side) of the stator 12, a bowl-shaped second bracket 18 fixed to the second core holder 14b and covering the other end side (non-drive side) of the stator 12, and a plurality of, for example, four, cover plates 20 fixed to the outer periphery of the stator 12. The first bracket 16 and the second bracket 18, together with the stator 12, form a case (enclosure) whose inside is sealed. A bearing housing incorporating bearings B1 and B2, which will be described later, is attached to the first bracket 16 and the second bracket 18. A rotor 28 (described later) is provided within the case and is rotatable relative to the stator 12. The rotating shaft of the rotor is supported by bearings at both axial ends and is disposed rotatably about a central axis C1.

[0009] As shown in Fig. 3, the stator 12 has a substantially annular or cylindrical stator core 24 and a stator coil 26 wound around the stator core. The stator core 24 is formed by stacking a number of annular thin metal sheets (electromagnetic steel sheets) P1 made of a magnetic material, for example, silicon steel, in the axial direction. The stator coil 26 is disposed in a number of slots in the stator core 24, and has coil ends 27a, 27b extending in the axial direction from one end face 24a and the other end face 24b of the stator core 24. A first core holder 14a and a second core holder 14b are disposed on the one end face and the other end face of the axial direction of the stator core 24, and hold the stator core 24 by sandwiching it from both sides in the axial direction.

[0010] The first bracket 16 is formed in a bowl shape from, for example, aluminum or an aluminum alloy, and has an approximately cylindrical peripheral wall 16a and a disk-shaped bottom wall 16b that closes one end of the peripheral wall 16a. The first bracket 16 is arranged coaxially with the central axis C1 and covers the driving side of the stator 12 by fixing the open end of the peripheral wall 16a to the first core presser 14a. The bottom wall 16b faces one end face of the stator core 24 with an axial gap between them. A ring-shaped first bearing bracket 53 is fastened to the center of the bottom wall 16b with a bolt. A first bearing housing 54 incorporating a first bearing B1 is fastened to the center of the first bearing bracket 53. A plurality of air intakes 55 are provided in the first bearing bracket 53 around the first bearing B1. Fig. 4 is a cross-sectional view of the first bracket 16 taken along line CC in Fig. 3. As shown in the figure, the first bearing bracket 53 is provided with a plurality of air intake ports 55. The plurality of air intake ports 55 are located around the rotating shaft 30 and are arranged at equal intervals in the circumferential direction.

[0011] As shown in Fig. 3, the second bracket 18 is made of aluminum or an aluminum alloy and is generally bowl-shaped, and has a generally cylindrical peripheral wall 18a, a disk-shaped bottom wall 18b closing one end of the peripheral wall 18a, and an annular partition wall 18c disposed on the inner surface of the bottom wall 18b and facing the peripheral wall 18a at a distance. The second bracket 18 is arranged coaxially with the central axis C1 and covers the non-driving side of the stator 12 by fixing the end of the opening side of the peripheral wall 18a to the second core holder 14b. A second bearing housing 62 incorporating the second bearing B2 is fastened to the center of the bottom wall 18b. A plurality of air intakes 55 are provided in the bottom wall 18b around the second bearing B2.

[0012] The rotor 28 includes a rotating shaft 30, a rotor core 32, and a plurality of permanent magnets M embedded in the rotor core 32. The rotating shaft 30 is disposed in the case coaxially with the central axis C1, and one and the other axial ends are rotatably supported by a first bearing B1 and a second bearing B2, respectively. One end of the rotating shaft 30 extends outside the machine through the bearing B1 and constitutes a driving end 30a. The rotor core 32 is formed by laminating a number of annular thin metal sheets (electromagnetic steel sheets) P2 made of a magnetic material, for example, silicon steel sheets, in the axial direction, and is formed into a substantially cylindrical shape. The rotor core 32 is attached to the approximate center of the rotating shaft 30 in the axial direction, and is disposed inside the stator core 24 coaxially with the central axis C1. The outer peripheral surface of the rotor core 32 faces the inner peripheral surface of the stator core 24 with a gap (air gap) therebetween. The axial length of the rotor core 32 is formed to be substantially equal to the axial length of the stator core 24, and the rotor core 32 faces the stator core 24 over its entire length.

[0013] A plurality of magnet embedding holes 50, each extending in the axial direction, are formed on the outer periphery of the rotor core 32 and are arranged at intervals in the circumferential direction. The magnet embedding holes 50 are formed penetrating the rotor core 32 in the axial direction and open to both end faces of the rotor core 32. A rectangular plate-shaped permanent magnet M is loaded into each magnet embedding hole 50. The permanent magnet M extends throughout the entire axial length of the rotor core 32.

[0014] The rotor core 32 is supported by being sandwiched from both axial end faces by a pair of disk-shaped core holders 28a, 28b attached to the rotating shaft 30. The core holders 28a, 28b are formed in an annular shape, and the outer diameter thereof is formed slightly smaller than the outer diameter of the rotor core 32. A first fan FA is attached to the rotating shaft 30 between the rotor core 32 and the first bearing B1, and is rotatable integrally with the rotating shaft 30. A second fan FB is attached to the rotating shaft 30 between the rotor core 32 and the second bearing B2, and is rotatable integrally with the rotating shaft 30.

[0015] The first fan FA is configured as a centrifugal fan, and generates wind in the radial direction by rotation. The first fan FA includes a trumpet-shaped or sector-shaped fan body 70a. The fan body 70a is fixed to the rotating shaft 30, and extends from the rotor core 32 side toward the first bracket 16 while spreading outward in the radial direction. The outer peripheral edge of the fan body 70a is located inside the peripheral wall 16a of the first bracket 16, and is arranged radially side by side with a part of the peripheral wall 16a. This outer peripheral edge engages with the inner peripheral part of the peripheral wall 16a with a circular minute gap therebetween. The circular minute gap is formed in a substantially two-stage structure with concave and convex shapes, forming a labyrinth structure part X. The internal space of the first bracket 16 is partitioned by the fan body 70a into an outer space OA defined between the first fan FA and the bottom wall 16b, and an inner space IA defined between the first fan FA and the stator 12. The air intake 55 of the first bracket 16 communicates with the outer space OA.

[0016] Fig. 5 is a cross-sectional view of the first bracket 16 taken along line DD in Fig. 3. As shown in the figure, the first fan FA has an annular inner shroud 72 arranged facing the inner surface of the fan body 70a on the side of the stator core 24 with a gap therebetween, a plurality of inner blades 73 provided between the inner surface of the fan body 70a and the inner shroud 72, and a plurality of outer blades 74 provided on the outer surface of the fan body 70a on the side of the first bearing B1. The inner blades 73 are provided at regular intervals in the circumferential direction and are located in the inner space IA. The outer blades 74 are provided at regular intervals in the circumferential direction and are located in the outer space OA.

[0017] As shown in FIG. 3, the second fan FB is configured as a centrifugal fan, and generates wind in the radial direction by rotation. The second fan FB has a trumpet-shaped or sector-shaped fan body 76a. The fan body 76a is fixed to the rotating shaft 30 via the core holder 28b, and extends from the rotor core 32 side toward the bottom wall 18b of the second bracket 18 while spreading outward toward the outer periphery in the radial direction. The outer periphery of the fan body 76a is located inside the partition wall 18c of the second bracket 18, and is arranged side by side with the partition wall 18c in the radial direction. This outer periphery engages with the inner periphery of the partition wall 18c with a circular minute gap therebetween. The circular minute gap portion is formed in a substantially two-stage structure with concave and convex shapes, forming a labyrinth structure portion X. The internal space of the second bracket 18 is partitioned by the fan body 76a and the partition wall 18c into an outer space OA defined between the second fan FB and the bottom wall 18b, and an inner space IA defined between the second fan FB and the stator 12. The intake port 65 and the exhaust port of the second bracket 18 communicate with the outer space OA.

[0018] The second fan FB has an annular outer shroud 77 arranged opposite to and with a gap between the outer surface of the fan body 76a on the second bearing B2 side, and a plurality of outer blades 78 provided between the fan body 76a and the outer shroud 77. The outer blades 78 are provided at regular intervals in the circumferential direction and are located in the outer space OA.

[0019] FIG. 6 is a cross-sectional view of the stator and rotor taken along line BB in FIG. As shown in FIG. 6, in this embodiment, the rotor 28 is configured with multiple magnetic poles, for example, six magnetic poles. Two permanent magnets M are embedded in the rotor core 32 for each magnetic pole. If an axis extending in the radial direction through the central axis C1 and the circumferential magnetic pole center is defined as a magnetic pole central axis (d-axis), magnet embedding holes 50 are provided on both circumferential sides of each d-axis. The magnet embedding holes 50 have a substantially rectangular cross-sectional shape corresponding to the shape of the permanent magnet M, and are each inclined with respect to the d-axis. The two permanent magnets M are loaded and arranged in the magnet embedding holes 50. The permanent magnets M may be fixed to the rotor core 32 by, for example, an adhesive or the like.

[0020] The permanent magnets M are formed, for example, in the shape of an elongated flat plate with a rectangular cross section, and are arranged over the entire axial length of the rotor core 32. Each magnet embedding hole 50 has a substantially rectangular loading area in which the permanent magnets M are loaded, an inner circumferential gap 50a that bulges from one end of the loading area in the longitudinal direction toward the d-axis, and an outer circumferential gap 50b that bulges from the other end of the loading area in the longitudinal direction toward the outer circumferential surface of the rotor core 32. The two magnet embedding holes 50 and the two permanent magnets M are arranged side by side in a substantially V-shape, with their inner circumferential ends adjacent to each other across the d-axis and their outer circumferential ends spaced apart from the d-axis in the circumferential direction and located near the outer circumferential surface of the rotor core 32. As will be described later, cooling air can flow through the inner circumferential gap 50a and the outer circumferential gap 50b of each magnet embedding hole 50.

[0021] A plurality of slots 36 are formed in the inner periphery of the stator core 24. The plurality of slots 36 are arranged at equal intervals in the circumferential direction. Each slot 36 opens into the inner periphery of the stator core 24 and extends radially from this inner periphery. Each slot 36 extends over the entire axial length of the stator core 24. By forming the plurality of slots 36, the inner periphery of the stator core 24 defines a plurality of teeth 38 that face the rotor 28. The stator coil 26 is composed of, for example, a plurality of rectangular conductors. Two stator coils 26 are arranged in each slot 36 and wound around the teeth 38. By passing a current through the stator coil 26, a predetermined interlinkage magnetic flux is formed in the stator 12 (teeth 38).

[0022] In this embodiment, the stator 12 has flow passage forming portions (first flow passage forming portions) 40 provided at a plurality of locations, for example, four locations, on its outer periphery. The four flow passage forming portions 40 are positioned at equal intervals, for example, 90 degrees apart, in the circumferential direction. Each flow passage forming portion 40 has a lattice-shaped rib 42 extending radially outward from the outer periphery of each electromagnetic steel sheet P1 constituting the stator core 24. The rib 42 has a main rib 42a having a substantially arc shape. The main rib 42a extends radially outward from one location on the outer periphery of the electromagnetic steel sheet P1 to another location spaced apart in the circumferential direction, and faces the outer periphery at a distance. A first flow passage F1 is defined between the main rib 42a and the outer periphery of the electromagnetic steel sheet P1. In addition, the rib 42 integrally includes a plurality of first straightening ribs 42b each extending radially from the outer peripheral edge of the electromagnetic steel sheet P1 to the main rib 42a and dividing the first flow path F1 into multiple parts circumferentially, and a plurality of second straightening ribs 42c each extending radially outward from the outer peripheral edge of the main rib 42a.

[0023] A large number of electromagnetic steel sheets P1 are concentrically stacked, so that the ribs 42 are aligned in the axial direction. As a result, a first flow passage F1 that extends continuously in the axial direction is formed between the ribs 42 and the outer circumferential surface of the stator core 24. The first flow passage F1 is located in the first flow passage F1, and can function as a flow straightening plate. The flow passage forming portion 40 has a cover plate 20. The cover plate 20 is disposed covering the rib 42, and both side edges of the cover plate 20 are fixed to the outer periphery of the stator core 24, for example, by welding. A pair of opposing end edges of the cover plate 20 are welded to the first core holder 14a and the second core holder 14b, respectively. A second flow passage F2 is defined by the outer periphery of the stator core 24, the outer periphery of the main rib 42a, and the inner surface of the cover plate 20. The second flow passage F2 extends continuously in the axial direction from one axial end of the stator core 24 to the other axial end. The second flow straightening rib 42c is located in the second flow passage F2 and can function as a flow straightening plate.

[0024] Fig. 7 is a perspective view of a rotating electric machine showing a vertical cross section of a part of the rotating electric machine. As shown in Fig. 7, in this embodiment, a large number of electromagnetic steel sheets P2 constituting the stator core 24 are stacked around the central axis C1 while being sequentially shifted in the rotational direction by several degrees. As a result, the first flow passage F1 of each flow passage forming portion 40 extends at a predetermined angle with respect to the axial direction. Similarly, the multiple second flow straightening ribs 42c located in the second flow passage F2 extend at a predetermined angle with respect to the axial direction.

[0025] As shown in FIG. 2, each of the first core holder 14a and the second core holder 14b of the stator 12 has four flow ports 44 provided on the outer periphery. The four flow ports 44 are positioned at equal intervals in the circumferential direction, for example, at 90 degrees apart. Each flow port 44 includes a first flow port 44a and a second flow port 44b, each of which is an arc-shaped long hole extending in the circumferential direction. The first and second flow ports 44a, 44b are arranged side by side in the radial direction, and in one example, the first flow port 44a is located on the inside in the radial direction and the second flow port 44b is located on the outside in the radial direction. Note that the first flow port 44a and the second flow port 44b may each be divided into a plurality of flow ports in the circumferential direction.

[0026] As shown in Fig. 3 and Fig. 7, in a state where the first core holder 14a and the second core holder 14b are attached to the end face of the stator core 24, the first flow port 44a of the first core holder 14a is located opposite one end of the corresponding first flow passage F1 of the stator 12 and communicates with the first flow passage F1. The second flow port 44b of the first core holder 14a is located opposite one end of the corresponding second flow passage F2 of the stator 12 and communicates with the second flow passage F2. Similarly, the first flow port 44a of the second core holder 14b is located opposite the other end of the corresponding first flow passage F1 of the stator 12 and communicates with the first flow passage F1. The second flow port 44b of the second core holder 14b is located opposite the other end of the corresponding second flow passage F2 of the stator 12 and communicates with the second flow passage F2.

[0027] As shown in FIG. 1, the first bracket 16 has flow passage forming protrusions (second flow passage forming portions) 48 of a predetermined width and a predetermined thickness provided at a plurality of locations, four locations here, on the peripheral wall 16a. The four flow passage forming protrusions 48 are positioned at equal intervals in the circumferential direction, for example, spaced apart by 90 degrees. Each flow passage forming protrusion 48 extends in the axial direction from the open end of the peripheral wall 16a to the bottom wall 16b, and has a predetermined width in the circumferential direction. Each of the flow passage forming protrusions 48 faces the flow passage forming portion 40 of the stator 12. An outside air flow passage and an inside air flow passage, which will be described later, are formed in the flow passage forming protrusions 48 in a state of being partitioned from each other. A flange 52 is provided at each open end of the peripheral wall 16a between two adjacent flow path forming protrusions 48. The outer diameter and shape of the peripheral wall 16a including the flow path forming protrusions 48 and the flanges 52 approximately match the outer diameter and shape of the first core retainer 14a. The inner diameter of the peripheral wall 16a is set to be slightly smaller than the outer diameter of the stator core 24 (the outer diameter excluding the flow path forming portions 40). The first bracket 16 is fixed to the first core holder 14a at positions where the four flow passage forming protrusions 48 face the flow ports 44 of the first core holder 14a. Here, the flange 52 is fastened to the first core holder 14a by bolts.

[0028] The second bracket 18 has flow path forming protrusions (third flow path forming portions) 58 of a predetermined width and thickness provided at multiple locations, four locations in this case, on the peripheral wall 18a. The four flow path forming protrusions 58 are positioned at equal intervals in the circumferential direction, for example, spaced apart by 90 degrees. Each flow path forming protrusion 58 extends from one end to the other end of the axial direction of the peripheral wall 18a and has a predetermined width in the circumferential direction. In the flow path forming protrusions 58, an outside air flow path and an inside air flow path, which will be described later, are formed in a state in which they are separated from each other.

[0029] A flange 61 is provided at each open end of the peripheral wall 18a between two adjacent flow path forming protrusions 58. The outer diameter and shape of the peripheral wall 18a including the flow path forming protrusions 58 and the flanges 61 approximately match the outer diameter and shape of the second core holder 14b. The inner diameter of the peripheral wall 18a is set to be slightly smaller than the outer diameter of the stator core 24 (the outer diameter excluding the flow path forming portions 40). The second bracket 18 has flow passage forming protrusions (third flow passage forming parts) 58 of a predetermined width and a predetermined thickness provided at a plurality of places, here four places, on the peripheral wall 18a. The four flow passage forming protrusions 58 are positioned at equal intervals in the circumferential direction, for example, spaced apart by 90 degrees. Each flow passage forming protrusion 58 extends in the axial direction from the open end of the peripheral wall 18a to the bottom wall 18b, and has a predetermined width in the circumferential direction. Inside the flow passage forming protrusion 58, an outside air flow passage and an inside air flow passage, which will be described later, are formed in a state in which they are separated from each other. The second bracket 18 is fixed to the second core holder 14a at positions where the four flow passage forming protrusions 58 face the flow ports 44 of the second core holder 14b, respectively. Here, a flange 61 is fastened to the second core holder 14b by a bolt.

[0030] Next, the configuration of the flow passage forming protrusion 48 of the first bracket 16 will be described. FIG. 8 is a perspective view of the flow passage forming protrusion 48, which shows the outside air flow passage and the inside air flow passage formed in the flow passage forming protrusion 48 of the first bracket. As shown in the figure, the first outside air flow passage RA and the first inside air flow passage RI are formed in the flow passage forming protrusion 48. The flow passage forming protrusion 48 has a first inlet IP1 that opens into the outer space OA of the first bracket 16 and a first outlet OP1 that faces one end of the first flow passage F1 of the stator 12. The first outside air flow passage RA connects the first inlet IP1 and the first outlet OP1. The first outside air flow passage RA extends in the axial direction from the first inlet IP1 to the first outlet OP1. The first outside air flow passage RA has a first width W1 in the circumferential direction. The first outside air flow passage RA has a narrow width portion WS in the middle of the axial direction, the circumferential width of which is narrower than other portions. The flow passage forming protrusion has a second inlet IP2 that opens into the inner space IA of the first bracket 16 and a second outlet OP2 that faces one end of the second flow passage F2 of the stator 12. The second inlet IP2 is located in line with the narrow portion WS of the first outside air flow passage RA in the circumferential direction. The second outlet OP2 is located radially outward from the first outlet OP1. The first inside air flow passage RI connects the second inlet IP2 and the second outlet OP2. The first inside air flow passage RI extends radially outward from the second inlet IP2 across the first outside air flow passage RA, and further extends in the axial direction to the second outlet OP2. The portion of the first inside air flow passage RI that extends in the axial direction has a first width W1 in the circumferential direction and is located radially outward from the first outside air flow passage RA.

[0031] Next, the configuration of the wall portion forming the first outside air flow path RA and the first inside air flow path RI will be described. Fig. 9 is a perspective view showing a cross section of the flow path forming convex portion taken along line FF in Fig. 8, Fig. 10 is a perspective view showing a cross section of the flow path forming convex portion taken along line GG in Fig. 8, and Fig. 11 is a perspective view showing a cross section of the flow path forming convex portion taken along line HH in Fig. 6. As shown in FIG. 9, the flow path forming convex portion 48 has a first end wall 48a that extends radially from the opening end of the peripheral wall 16a and has a circumferential width W, and a pair of first side walls 48b that are respectively erected radially on the peripheral wall 16a and extend axially from one end and the other end in the circumferential direction of the first end wall 48a to the bottom wall 16b, and face each other with a first width W1 in the circumferential direction. The first bottom wall 48c is located between the pair of first side walls 48b and extends axially from the end on the opening end side of the first end wall 48a to the bottom wall 16b and has a first width W1 in the circumferential direction. In the present embodiment, the first bottom wall 48c is formed of a part of the peripheral wall 16a of the first bracket 16. A first outlet OP1 and a second outlet OP2 are formed in the first end wall 48a. The first outlet OP1 and the second outlet OP2 are elongated holes extending in the circumferential direction and have a predetermined width (<W1) in the circumferential direction. The first outlet OP1 is located on the opening end side of the peripheral wall 16a, and the second outlet OP2 is located radially outside the first outlet OP1. The flow path forming convex portion 48 has a first partition wall 48d that is located between the pair of first side walls 48b and extends axially from the middle portion in the radial direction of the first end wall 48a to the bottom wall 16b and faces the first bottom wall 48c with a radial interval, and a first ceiling wall 48e that is located between the pair of first side walls 48b and extends axially from the end on the extending side of the first end wall 48a to the bottom wall 16b and faces the first partition wall 48d with a radial interval. The first partition wall 48d and the first ceiling wall 48e each have a first width W1 in the circumferential direction. The end on the bottom wall 16b side of the first ceiling wall 48e is connected to the end on the bottom wall 16b side of the first partition wall 48d.

[0032] As shown in FIG. 9, the first bottom wall 48c is formed with a first inlet IP1 and a second inlet IP2. The first inlet IP1 is located adjacent to the bottom wall 16b. The first inlet IP1 is an elongated hole extending in the circumferential direction and has a second width W2 in the circumferential direction. The second width W2 is slightly smaller than the first width W1 of the first bottom wall 48c. The second inlet IP2 is located on the first end wall 48a side with respect to the first inlet IP1 and is located adjacent to one side wall 48b. The second inlet IP2 is an elongated hole extending in the circumferential direction from one side wall 48b to the other side wall 48b and has a third width W3 in the circumferential direction. The third width W3 is smaller than the second width W2, and is set to, for example, about 1 / 2 of the first width W1.

[0033] 10 and 11, a flow port CP1 is formed in the first partition wall 48d. The flow port CP1 is located radially opposite the second inlet IP2. The flow port CP1 is an elongated hole extending in the circumferential direction from one side wall 48b to the other side wall 48b, and has a third circumferential width W3. The flow path forming protrusion 48 has a cylindrical second partition wall 48f located between the first bottom wall 48c and the first partition wall and extending in the radial direction. One end of the second partition wall 48f is connected to the first bottom wall 48c and located around the second inlet IP2, and the other end of the second partition wall 48f is connected to the first partition wall 48d and located around the flow port CP1. In this embodiment, a part of the second partition wall 48f is formed by the side wall 48b. The inner peripheral surface of the second partition wall 48f defines a flow path connecting the second inlet IP2 and the flow port CP1.

[0034] In the flow path forming convex portion 48 configured as described above, the first bottom wall 48c, the first partition 48d, the pair of first side walls 48b, and the second partition 48f define a first outside air flow path RA connecting the first inlet IP1 and the first outlet OP1, and the first partition 48d, the first ceiling wall 48e, the pair of first side walls 48b, and the second partition 48f define a first inside air flow path IR connecting the second inlet IP2 and the second outlet OP2.

[0035] 5, the four flow passage forming protrusions 48 of the first bracket 16 are positioned at equal intervals in the circumferential direction, for example, at 90° intervals. In this embodiment, one flow passage forming protrusion 48 is formed so that the narrow width portion WS of the first outside air flow passage RA is positioned adjacent to one side wall 48b, and another flow passage forming protrusion 48 adjacent in the circumferential direction is formed so that the narrow width portion WS is positioned adjacent to the other side wall 48b. In other words, the two flow passage forming protrusions adjacent in the circumferential direction are formed in a shape symmetrical with respect to the imaginary line L1 passing between the two flow passage forming protrusions 48 and the central axis C1.

[0036] As shown in Fig. 3, in a state where the first bracket 16 is fixed to the first core holder 14a, the first outlet OP1 of each flow passage forming protrusion 48 faces the first flow port 44a of the first core holder 14a and one end of the first flow passage F1 of the stator 12. As a result, the first outside air flow passage RA of the flow passage forming protrusion 48 communicates with one end of the first flow passage F1 via the first outlet OP1 and the first flow port 44a. The second outlet OP2 of each flow passage forming protrusion 48 faces the first flow port 44b of the first core holder 14a and one end of the second flow passage F2 of the stator 12. As a result, the first inside air flow passage RI of the flow passage forming protrusion 48 communicates with one end of the second flow passage F2 via the second outlet OP2 and the second flow port 44b. The first inlet IP1 of each flow passage forming protrusion 48 opens into the outer space OA of the first bracket 16, and the first outside air flow passage RA communicates with the outer space OA via the first inlet IP1. The second inlet IP2 of each flow passage forming protrusion 48 opens into the inner space IA of the first bracket 16, and the first inside air flow passage RI communicates with the inner space IA via the second inlet IP2.

[0037] Next, the configuration of the flow passage forming protrusion 58 of the second bracket 18 will be described. FIG. 12 is a cross-sectional view of the second bracket portion taken along line EE in FIG. As shown in FIGS. 3, 7 and 12, the flow passage forming protrusion 58 includes a second end wall 58a extending radially from the open end of the peripheral wall 18a and having a predetermined width in the circumferential direction, a pair of second side walls 58b extending axially from one end and the other end of the second end wall 58a in the circumferential direction to the bottom wall 18b, respectively, and standing in the radial direction and facing each other with a predetermined width in the circumferential direction, a second bottom wall 58c located between the pair of second side walls 58b and extending axially from an end on the open end side of the second end wall 58a to the bottom wall 18b, and a pair of second side walls 58b. a third partition wall 58d located between the pair of second side walls 58b, extending axially from the second end wall 58a to the bottom wall 58b and facing the second bottom wall 58c at a distance in the radial direction; a second ceiling wall 58e located between the pair of second side walls 58b, extending axially from the end of the extending side of the second end wall 58a to the bottom wall and facing the second partition wall at a distance in the radial direction; and a fourth partition wall 58f located between the second bottom wall 58c and the third partition wall 58d and connected to the second bottom wall 58c and the third partition wall 58d. The flow path forming convex portion 58 has a third inlet IP3 formed in the second end wall 58a and facing the other end of the first flow path F1, a fourth inlet IP4 formed in the second end wall 58a and located radially outside the third inlet IP3 and facing the other end of the second flow path F2, and an exhaust port 60 formed in each second side wall 58b. 7, the second flow path forming protrusion 58 further includes a third outlet OP3 formed in the second bottom wall 58c and positioned adjacent to the bottom wall 18b, and a second flow port CP2 formed in the third partition wall 58d and facing the third outlet OP3. The fourth partition wall 58f described above has one end connected to the second bottom wall 58c between the exhaust port 60 and the third outlet OP3, and the other end connected to the third partition wall 58d between the exhaust port 60 and the second flow port CP2, and defines a flow path connecting the second flow port CP2 and the third outlet OP3.

[0038] The second bottom wall 58c, the third partition wall 58d, the pair of second side walls 58b, and the fourth partition wall 58f form a second outside air flow path RA that connects the third inlet IP3 and the exhaust port 60. The second outside air flow path RA extends in the axial direction from the third inlet IP3 to the fourth partition wall 58f between the second bottom wall 58c and the third partition wall 58d, and is connected to the exhaust port 60 formed in the pair of second side walls 58b. The third partition 58d, the second ceiling wall 58e, the fourth partition 58f, and the pair of second side walls 58b form a second inside air flow path RI connecting the third outlet OP3 and the fourth inlet IP4. The second inside air flow path RI extends in the axial direction between the third partition 58d and the second ceiling wall 58e from the fourth inlet IP4 to the vicinity of the bottom wall 18b, and further extends through the second circulation port CP2 to the third outlet OP3. The circumferential width of the second outside air flow path RA and the circumferential width of the second inside air flow path RI are formed to be substantially equal to the circumferential width of the flow path forming protrusion 58.

[0039] As shown in FIG. 3, in a state in which the second bracket 18 is fixed to the second core holder 14b, the third inlet IP3 of each flow passage forming protrusion 58 faces the first flow port 44a of the second core holder 14b and the other end of the first flow passage F1 of the stator 12. As a result, the second outside air flow passage RA of the flow passage forming protrusion 58 communicates with the other end of the first flow passage F1 via the third inlet IP3 and the first flow port 44a. The fourth inlet IP4 of each flow passage forming protrusion 58 faces the second flow port 44b of the second core holder 14b and the other end of the second flow passage F2 of the stator 12. As a result, the second inside air flow passage RI of the flow passage forming protrusion 58 communicates with the other end of the second flow passage F2 via the fourth inlet IP4 and the second flow port 44b. The third outlet OP3 of each flow passage forming protrusion 58 opens into the outer space OA of the second bracket 18, and the second outside air flow passage RA communicates with the outer space OA via the third outlet OP3.

[0040] The operation and cooling effect of the rotating electrical machine 10 configured as above will be described. 3, when the rotating electric machine 10 is in operation, current is applied to the stator coil 26, causing the rotor 28 to rotate around the central axis C1. At this time, the stator coil 26 and the permanent magnets M generate heat, and this heat is transferred to each part within the rotating electric machine 10, causing the temperature to rise. The first fan FA and the second fan FB rotate integrally with the rotating shaft 30 of the rotor 28 around the central axis C1. In FIG. 3, solid arrows indicate the flow of outside air, and hollow arrows indicate the flow of inside air. When the first fan FA rotates, an air flow is generated in the outer space OA of the first bracket 16 by the outer blades 74. As a result, the outside air is sucked into the outer space OA through the intake port 55 provided in the bottom wall 16b. The outside air that has flowed in, that is, the cooling air, flows around the first bearing B1, and then flows in the radial direction in the outer space OA along the fan body 70a and the bottom wall 16b, and a part of it flows into the first outside air flow path RA from the first inlet IP1 of each flow path forming protrusion 48. The cooling air passes through the first outside air flow path RA and flows into the first flow path F1 of the stator 12, and after flowing through this first flow path F1, it flows into the second outside air flow path RA of the second bracket 18. After flowing through the second outside air flow path RA, the cooling air is exhausted to the outside of the machine from the exhaust port 60.

[0041] As described above, the first bearing B1 and the fan body 70a are cooled and the temperature is reduced by the cooling air introduced into the outer space OA from the intake port 55. At this time, the heat of the rotor 28 and the heat of the inner space IA are transferred to the fan body 70a and dissipated from the fan body 70a to the cooling air. This contributes to reducing the temperature of the rotor 28 and the inner space IA. When the cooling air flows through the first flow passage F1 of the stator 12, the cooling air flows in direct contact with the outer circumferential surface of the stator core 24. Heat from the stator core 24 is dissipated to the cooling air, and the stator core 24 is cooled. Since the first flow passage F1 is provided with a plurality of first flow straightening ribs 42b, the cooling air flows almost evenly throughout the entire circumferential area without being biased to one side in the circumferential direction within the first flow passage F1. At the same time, the provision of the first flow straightening ribs 42b increases the contact area between the stator core 24 and the cooling air, which contributes to more efficient heat dissipation and cooling of the stator core 24.

[0042] At the same time, when the first fan FA rotates, the inner blades 73 generate an internal airflow in the inner space IA of the first bracket 16. The internal airflow passes between the inner blades 73 of the first fan FA and the inner shroud 72 and flows out in the radial direction. The flowing-out internal air passes around the coil ends 27a and flows into the first internal air flow path RI from the second inlet IP2 of the flow path forming protrusion 48. After flowing through the first internal air flow path RI, the flowing-in internal air flows into the second flow path F2 of the stator 12 and flows through the second flow path F2. Furthermore, the inside air flows from the second flow path F2 through the second inside air flow path RI of the second bracket 18, into the inner space IA of the second bracket 18, flows around the coil ends 27b, and then returns to the inner space IA of the first bracket 16 through the magnet embedding holes (inner circumference side gap 50a, outer circumference side gap 50b) 50 of the rotor core 32 and the gap (air gap) between the rotor core 32 and the stator core 24.

[0043] While flowing through the inside air flow passage RI of the first bracket 16, the inside air is cooled through the partition by the outside air flowing through the first outside air flow passage RA, and the temperature of the inside air is reduced. Also, while flowing through the second flow passage F2 of the stator 12, the inside air dissipates heat to the outside of the machine through the cover plate 20, and the temperature of the inside air is reduced. At the same time, the inside air is cooled through the main rib 42a by the cooling air flowing through the first flow passage F1, and the temperature of the inside air is reduced. Since the second flow passage F2 is provided with a plurality of second straightening ribs 42c, the inside air does not bias to one side in the circumferential direction in the second flow passage F2, but flows almost evenly over the entire circumferential direction. At the same time, by providing the second straightening ribs 42c, the contact area of ​​the rib on the stator core 24 side is increased, and the inside air can be more efficiently dissipated and cooled. By circulating the inside air whose temperature has been reduced as described above inside the machine, the heat of the stator coil 26, the stator core 24, the rotor core 32, and the permanent magnets M can be dissipated to the inside air, and the heat of these can be contributed to cooling them.

[0044] On the other hand, when the second fan FB rotates, an airflow is generated in the outer space OA of the second bracket 18 by the outer blades 78 and the outer shroud 77. As a result, outside air is drawn into the outer space OA through the air intake 65 provided in the bottom wall 18b. The outside air that has flowed in, i.e., the cooling air, flows around the second bearing B2 and along the outer surface of the fan body 76a, and then flows out of the aircraft from the outlet of the bottom wall 18b. The cooling air introduced into the outer space OA cools the second bearing B2 and the fan body 76a, lowering their temperatures. At this time, heat from the rotor 28 and the inner space IA is transferred to the fan body 76a, and dissipated from the fan body 76a to the cooling air. This contributes to lowering the temperatures of the rotor 28 and the inner space IA.

[0045] According to the rotating electric machine according to the present embodiment configured as described above, a first flow passage F1 is provided so as to be in contact with the outer peripheral surface of the stator core 24, and a second flow passage is provided so as to cover the radial outer peripheral side of the first flow passage F1, and by configuring so that outside air flows through the first flow passage F1 and inside air flows through the second flow passage F2, it is possible to efficiently cool the stator core 24 with the outside air, dissipate heat of the inside air flowing through the second flow passage F2 to the outside of the machine, and cool the inside air with the outside air. By circulating the inside air with a reduced temperature inside the rotating electric machine, it is possible to contribute to cooling the stator coil, rotor core, permanent magnets, etc. inside the machine. The first flow passage F1 of the stator 12 is formed by a flow passage forming portion 40 including a rib 42 integrally formed with the electromagnetic steel sheet P1 constituting the stator core 24. Therefore, there is no need to provide an independent ventilation duct or the like on the outer periphery of the stator, which makes it possible to reduce the number of parts and make the rotating electric machine more compact.

[0046] Moreover, the first bracket 16 has a plurality of flow passage forming protrusions 48, and an outside air flow passage RA communicating with the first flow passage F1 of the stator 12 and an inside air flow passage RI communicating with the second flow passage F2 of the stator 12 are formed in each of the flow passage forming protrusions 48. That is, the first bracket 16 is configured to integrally have a plurality of outside air flow passages RA and a plurality of inside air flow passages RI. Similarly, the second bracket 18 is configured to integrally have a plurality of outside air flow passages RA and a plurality of inside air flow passages RI. Therefore, it is not necessary to provide an independent ventilation duct or the like in the first bracket and the second bracket, and it is possible to reduce the number of parts and to miniaturize the rotating electric machine. As described above, according to this embodiment, it is possible to provide a totally enclosed rotating electric machine that has improved cooling capacity and can be made compact.

[0047] Although the embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. The novel embodiment described above can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. These embodiments are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims. For example, in the above-described embodiment, the flow passage forming portions of the stator are provided at four locations on the outer periphery of the stator core, but this is not limiting, and the number of flow passage forming portions may be two, three, or five or more. The number of flow passage forming protrusions of the first bracket and the second bracket may be increased or decreased depending on the number of flow passage forming portions. The rotating electric machine of the present invention is not limited to a permanent magnet type rotating electric machine, and may be applied to an induction rotating electric machine having a squirrel-cage rotor. [Explanation of symbols]

[0048] 10... rotating machine, 12... stator, 16... first bracket, 16a... peripheral wall, 16b... bottom wall, 16c... partition wall, 18... second bracket, 18a... peripheral wall, 18b... bottom wall, 20... cover plate, 24... stator core, 26... stator coil, 28... rotor, 30... rotating shaft, 32... stator core, 40... flow passage forming portion, 48, 58... flow passage forming protrusion, 50... magnet embedding hole, M... permanent magnet, F1... first flow passage, F2... second flow passage, FA... first fan, 70a... fan body, 73... inner blade, 74... outer blade, FB... second fan, 76a... fan body, 78... outer blade, OA... outer space, IA... inner space, RA... outer air flow passage, RI... inner air flow passage, B1... first bearing, B2... second bearing

Claims

1. a stator comprising: a cylindrical stator core having a first end face located at one end in the axial direction and a second end face located at the other end in the axial direction, and an outer circumferential surface; a stator coil attached to the stator core; and a first flow passage forming portion provided on the outer periphery of the stator core, forming a first flow passage extending from one end to the other end in the axial direction of the stator core, and a second flow passage located outside the first flow passage in a radial direction of the stator core and extending from one end to the other end in the axial direction of the stator core; a first bracket including: an annular peripheral wall having an open end facing the first end face; a bottom wall facing the first end face at a distance; and a second flow passage forming portion formed by a part of the peripheral wall; a second bracket having an annular peripheral wall having an open end facing the second end surface and a bottom wall facing the second end surface at a distance; The second flow path forming portion of the first bracket is a first end wall extending radially from the open end of the peripheral wall and having a circumferential width; a pair of first side walls extending in the axial direction from one end and the other end of the first end wall in the circumferential direction to the bottom wall, and erected in the radial direction and facing each other at a distance in the circumferential direction; a first bottom wall located between the pair of first side walls, extending in the axial direction from an end of the first end wall on the side of the open end to the bottom wall, and having a first width in the circumferential direction; a first partition wall located between the pair of first side walls, extending in the axial direction from the first end wall to the bottom wall, having a first width in the circumferential direction, and facing the first bottom wall at a distance in the radial direction; a first ceiling wall located between the pair of first side walls, extending in the axial direction from an end of the first end wall on an extending side to the bottom wall, having a first width in the circumferential direction, and facing the first partition wall at a distance in the radial direction; a first outlet formed in the first end wall, having a predetermined width in the circumferential direction, and facing one end of the first flow path; a second outlet formed in the first end wall, having a predetermined width in the circumferential direction, positioned radially outward of the first outlet and facing one end of the second flow path; a first inlet formed in the first bottom wall and positioned adjacent the bottom wall, the first inlet having a first width in the circumferential direction; a second inlet formed in the first bottom wall and located on the first end wall side with respect to the first inlet, the second inlet having a second width in the circumferential direction smaller than the first width; a flow port formed in the first partition wall, facing the second inlet, the flow port having a third width in the circumferential direction smaller than the first width; a cylindrical second partition wall located between the first bottom wall and the first partition wall, the second partition wall having one end connected to the first bottom wall and located around the second inlet and the other end connected to the first partition wall and located around the flow port, an outside air flow path connecting the first inlet and the first outlet is formed by the first bottom wall, the first partition wall, the pair of first side walls, and the second partition wall; an inside air flow path connecting the second inlet and the second outlet is formed by the first partition wall, the first ceiling wall, the pair of first side walls, and the second partition wall; Rotating electric motor.

2. the second bracket has a third flow passage forming portion formed by a part of the peripheral wall, The third flow path forming portion is a second end wall extending radially from the open end of the peripheral wall and having a predetermined width in the peripheral direction; a third inlet formed in the second end wall and facing the other end of the first flow passage; a fourth inlet formed in the second end wall, positioned radially outward of the third inlet and facing the other end of the second flow passage; a pair of second side walls extending in the axial direction from one end and the other end of the first end wall in the circumferential direction to the bottom wall, and erected in the radial direction and opposed to each other across the first width in the circumferential direction; an exhaust port formed in the second side wall; a second bottom wall located between the pair of second side walls and extending in the axial direction from an end of the second end wall on the side of the opening end to the bottom wall; a third partition wall located between the pair of second side walls, extending in the axial direction from the second end wall to the bottom wall, and facing the second bottom wall at a distance in the radial direction; a second ceiling wall located between the pair of second side walls, extending in the axial direction from an end of the second end wall on an extending side to the bottom wall, and facing the second partition wall at a distance in the radial direction; a third outlet formed in the second bottom wall and positioned adjacent to the bottom wall; a second flow port formed in the third partition wall and facing the third inlet; a fourth partition wall located between the second bottom wall and the second partition wall, the fourth partition wall having one end connected to the second bottom wall between the exhaust port and the third outlet and the other end connected to the third partition wall between the exhaust port and the second flow outlet, an outside air flow path connecting the third inlet and the exhaust port is formed by the second bottom wall, the third partition wall, the pair of second side walls, and the fourth partition wall; The rotating electric machine according to claim 1 , wherein the third partition wall, the fourth partition wall, the second ceiling wall, and the pair of second side walls form an inside air flow passage connecting the fourth inlet and the third outlet.

3. a first bearing provided on the bottom wall of the first bracket; and a second bearing provided on the bottom wall of the second bracket. a rotor including: a rotating shaft supported by the first bearing and the second bearing so as to be rotatable about a central axis and arranged coaxially with the stator; and a rotor core attached to the rotating shaft and arranged coaxially inside the stator core; a first fan attached to the rotating shaft between the first bearing and the rotor core and rotatable integrally with the rotating shaft; a second fan attached to the rotating shaft between the second bearing and the rotor core and rotatable integrally with the rotating shaft; 3. The rotating electric machine according to claim 2, wherein the first fan comprises a fan body fixed to the rotating shaft and partitioning the internal space of the first bracket into an outer space located between the bottom wall and the first fan and communicating with the first air inlet and an intake port provided in the bottom wall, and an inner space located between the stator core and rotor core and the first fan and communicating with the second air inlet; a plurality of outer blades provided on the outer surface of the fan body and located in the outer space; and a plurality of inner blades provided on the inner surface of the fan body and located in the inner space.

4. 4. The rotating electric machine according to claim 3, wherein the second fan comprises: a fan body fixed to the rotating shaft, dividing the internal space of the second bracket into an outer space located between the bottom wall and the second fan and communicating with an intake port provided in the bottom wall, and an inner space located between the stator core and rotor core and the second fan and communicating with the third outlet; and a plurality of outer blades provided on an outer surface of the fan body and positioned in the outer space.

5. 2. The rotating electric machine according to claim 1, wherein the stator core is a laminated core formed by stacking a plurality of magnetic steel plates concentrically, the first flow path forming portion has ribs formed integrally with the outer peripheral edge of each magnetic steel plate, the ribs including: a main rib extending radially outward from the outer peripheral edge of the magnetic steel plate and defining the first flow path between the outer peripheral edge, a plurality of first straightening ribs each extending between the main rib and the outer peripheral edge and spaced apart from each other in the circumferential direction, and a plurality of second straightening ribs extending radially outward from the outer edge of the main rib.

6. 6. The rotating electric machine according to claim 5, wherein the first flow straightening rib is located within the first flow passage and constitutes a flow straightening plate extending from one end to the other end in the axial direction of the stator core.

7. 7. The rotating electric machine of claim 6, wherein the first flow passage forming portion comprises a cover plate fixed to the outer peripheral surface of the stator core and covering the rib, the second flow passage is defined between the outer edge of the main rib and the inner surface of the cover plate, and the second straightening rib is located within the second flow passage and constitutes a straightening plate extending from one end to the other end in the axial direction of the stator core.

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