Rotary electrical machine

Abstract

The present invention provides a rotary electrical machine which cools an armature, which has a simple structure, and which can be easily assembled.　A rotary electrical machine according to the present invention comprises an armature (20) and a rotor (30) which is disposed so as to face the armature (20) in the axial direction with a magnetic gap therebetween, wherein: the armature (20) includes, at a center part in the axial direction of an armature core (21), a flow path forming plate (24) in which a first flow path forming plate (24a) and a second flow path forming plate (24b) are aligned in the axial direction; the first flow path forming plate (24a) includes a first flow path groove (241a) in a surface thereof which faces the second flow path forming plate (24b); the second flow path forming plate (24b) includes a second flow path groove (241b) at a position which faces the first flow path groove (241a), in a surface thereof which faces the first flow path forming plate (24a); and the first flow path groove (241a) and the second flow path groove (241b) form a coolant flow path in which a cooling medium flows.

Description

rotating electrical machines

[0001] The present disclosure relates to a rotating electric machine.

[0002] In conventional axial gap type rotating electric machines, the armature is cooled, for example, by sealing the armature and rotor in a housing and operating a blower to suck in air from inside the housing (see, for example, Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2019-129637

[0004] In the rotating electric machine disclosed in Patent Document 1, a support plate is added to the gap between the armature and rotor, and a cavity is provided in the support plate for passing a coolant through it. This necessitates the addition of a support plate, and furthermore, the housing needs to be sealed to allow suction with a blower, resulting in a complex structure and requiring high assembly precision.

[0005] The present disclosure discloses a technique for solving the above-mentioned problems, and aims to provide a rotating electric machine that cools the armature, has a simple structure, and can be easily assembled.

[0006] The rotating electric machine of the present disclosure includes an armature and a rotor arranged axially opposite the armature with a magnetic gap therebetween, the armature including an armature core through which magnetic flux passes, a bobbin that insulates the surface of the armature core, a coil wound around the bobbin, and a flow path forming plate arranged in the axial center of the armature core, the flow path forming plate being a first flow path forming plate and a second flow path forming plate aligned in the axial direction, the first flow path forming plate having a first flow path groove on a surface facing the second flow path forming plate, the second flow path forming plate having a second flow path groove on a surface facing the first flow path forming plate at a position opposite the first flow path groove, and the first flow path groove and the second flow path groove forming a refrigerant flow path through which a cooling medium flows.

[0007] The rotating electric machine of the present disclosure includes an armature and a rotor arranged axially opposite the armature with a magnetic gap between them, the armature including an armature core through which magnetic flux passes, a bobbin that insulates the surface of the armature core, a coil wound around the bobbin, and a flow path forming plate arranged in the axial center of the armature core, the flow path forming plate being a first flow path forming plate and a second flow path forming plate aligned in the axial direction, the first flow path forming plate having a first flow path groove on its surface facing the second flow path forming plate, and the second flow path forming plate having a second flow path groove on its surface facing the first flow path forming plate at a position opposite the first flow path groove, the first flow path groove and the second flow path groove forming a refrigerant flow path through which a cooling medium flows, thereby cooling the armature, having a simple structure, and being easy to assemble.

[0008] FIG. 1 is a schematic diagram of a cross section of a rotary electric machine according to embodiment 1. FIG. 2 is a schematic diagram of a cross section of an armature in embodiment 1. FIG. 3 is a diagram for explaining an armature core in embodiment 1. FIG. 4 is a schematic diagram showing an example of a refrigerant flow path in embodiment 1. FIG. 5 is an enlarged view of a portion of the example of the refrigerant flow path in embodiment 1. FIG. 6 is a schematic diagram showing another example of a refrigerant flow path in embodiment 1. FIG. 7 is a diagram for explaining an armature core in embodiment 2. FIG. 8 is a schematic diagram showing an example of a refrigerant flow path in embodiment 2. FIG. 9 is a perspective view of an armature core in embodiment 3. FIG. 10 is a perspective view of an armature core before a first plate and a second plate in embodiment 3 are joined together. FIG. 11 is a schematic diagram showing an example of a refrigerant flow path in embodiment 3.

[0009] Hereinafter, a rotating electric machine according to an embodiment will be described in detail with reference to the drawings. Note that the same reference numerals in the various drawings indicate the same or corresponding parts.

[0010] Embodiment 1. Figure 1 is a schematic diagram showing a cross section of a rotating electric machine 100 according to embodiment 1. The rotating electric machine 100 according to embodiment 1 includes a housing 10, a shaft 40, an armature 20, and two rotors 30 arranged axially opposite each other with the armature 20 sandwiched therebetween. The rotors 30 are arranged relative to the armature 20 via a magnetic air gap. The rotating electric machine 100 according to embodiment 1 is an axial gap type rotating electric machine 100 and has a double rotor structure in which the armature 20 is arranged in the axial center and the rotors 30 are arranged at both axial ends. Compared to a radial gap type rotating electric machine in which the armature and rotor are arranged radially of the rotating shaft, the axial gap type rotating electric machine 100 can increase the area through which magnetic flux passes, thereby increasing the output density of the rotating electric machine.

[0011] The housing 10 includes a cylindrical frame 11 having a bottom and an end plate 12 that closes the opening of the frame 11. The rotor 30 includes a yoke 31 made of a steel plate that is highly permeable to magnetic flux, and permanent magnets 32. The permanent magnets 32 are arranged at equal intervals around the circumferential direction of the rotor 30 and are fixed thereto by, for example, adhesive or press-fitting. The permanent magnets 32 may be molded integrally with the yoke 31 using a plastic magnet. The shaft 40 is structurally connected to the rotor 30. The shaft 40 is rotatably supported by the housing 10 via bearings 50.

[0012] The armature 20 is fixed to the frame 11. The armature 20 includes an armature core 21 through which magnetic flux passes, a bobbin 22 that insulates the surface of the armature core 21, a coil 23 wound around the bobbin 22, a wiring connection plate 25 that distributes current to the coil 23, and a flow path forming plate 24 disposed in the axial center of the armature core 21. The flow path forming plate 24 includes a refrigerant flow path 26 through which a cooling medium flows. Methods for winding the coil 23 around the bobbin 22 include, for example, bobbin winding, in which the coil 23 is wound by rotating the bobbin 22; nozzle winding, in which the coil 23 is wound by passing a nozzle around the bobbin 22 in the circumferential direction; and flyer winding, in which the coil 23 is wound by rotating a flyer in the circumferential direction of the bobbin 22. The wiring plate 25 has three plates for three phases, and each plate and the electric wire of each phase of the coil 23 are connected by, for example, TIG welding, resistance brazing in which a brazing material is melted by heating through electrical current and connected, brazing or welding using a laser, or pressure welding in which the coil 23 is inserted into the end of a plate with a notch.

[0013] The armature 20 in the first embodiment is formed by stacking a first armature 20a and a second armature 20b in the axial direction. Fig. 2 is a diagram of only the armature 20 extracted from Fig. 1, a schematic diagram showing a cross section of the armature 20, and a schematic diagram of the cross sections of the first armature 20a and the second armature 20b. The first armature 20a includes a first armature core 21a serving as the armature core 21, a first bobbin 22a serving as the bobbin 22 that insulates the surface of the first armature core 21a, and a first coil 23a serving as the coil 23 wound around the first bobbin 22a. The second armature 20b includes a second armature core 21b serving as the armature core 21, a second bobbin 22b serving as the bobbin 22 that insulates the surface of the second armature core 21b, and a second coil 23b serving as the coil 23 wound around the second bobbin 22b. The end of the first armature core 21a facing the second armature core 21b is the first flow path forming plate 24a, and the end of the second armature core 21b facing the first armature core 21a is the second flow path forming plate 24b, and the first flow path forming plate 24a and the second flow path forming plate 24b are stacked together to form the flow path forming plate 24. In each phase, the plate of the connection plate 25 is connected to one end of the electric wire of the first coil 23a, and the other end of the electric wire of the first coil 23a is connected to one end of the electric wire of the second coil 23b.

[0014] 3 is a diagram illustrating the armature core 21 according to the first embodiment. The upper view of FIG. 3 is a perspective view of the first armature core 21a as viewed diagonally from above in FIG. 1 , and the lower view of FIG. 3 is a perspective view of the second armature core 21b as viewed diagonally from below in FIG. 1 . The first armature core 21a includes a first flow path forming plate 24a and first core teeth 211a, which are a plurality of core teeth arranged in the circumferential direction. In the first armature core 21a, for example, the first flow path forming plate 24a and the plurality of first core teeth 211a arranged in the circumferential direction are integrally molded using a powder magnetic core obtained by compressing powder such as iron. The first tooth side surfaces 212a, which are tooth side surfaces 212, are surfaces of the first core teeth 211a, which are core teeth, that face other circumferentially adjacent core teeth among surfaces parallel to the rotation axis 41, and are surfaces extending radially among surfaces parallel to the rotation axis 41 of the first core teeth 211a. The second armature core 21b has the same configuration as the first armature core 21a, and includes a second flow path forming plate 24b and a plurality of second core teeth 211b arranged in the circumferential direction. For example, the second flow path forming plate 24b and the plurality of second core teeth 211b arranged in the circumferential direction are integrally molded using a powder core obtained by compressing powder such as iron. The second teeth side surface 212b is a surface of the second core teeth 211b parallel to the rotation axis 41 that faces the other circumferentially adjacent core teeth, and is a surface of the second core teeth 211b parallel to the rotation axis 41 that extends radially. The first teeth side surface 212a and the second teeth side surface 212b are in the same position when viewed in the axial direction.

[0015] Fig. 4 is a schematic diagram showing an example of refrigerant flow path 26 in embodiment 1, with the upper diagram of Fig. 4 being a diagram of first armature core 21a viewed from below in Fig. 1, and the lower diagram of Fig. 4 being a diagram of second armature core 21b viewed from above in Fig. 1. In the upper diagram of Fig. 4, dotted lines indicate the position of a plane parallel to rotation axis 41 in first core teeth 211a. Similarly, in the lower diagram of Fig. 4, dotted lines indicate the position of a plane parallel to rotation axis 41 in second core teeth 211b. First flow path grooves 241a for flowing refrigerant from flow path inlets 261 to flow path outlets 262 are provided on the surface of first flow path forming plate 24a of first armature core 21a that faces second flow path forming plate 24b. The second armature core 21b has a surface of the second flow passage forming plate 24b of the second armature core 21b facing the first flow passage forming plate 24a, which is provided with a second flow passage groove 241b at a position facing the first flow passage groove 241a, for allowing the refrigerant to flow from the flow passage inlet 261 to the flow passage outlet 262. The first armature core 21a and the second armature core 21b are stacked in the axial direction with the surface of the first flow passage forming plate 24a including the first flow passage groove 241a and the surface of the second flow passage forming plate 24b including the second flow passage groove 241b aligned to form the armature core 21. In the armature core 21, the first flow passage groove 241a and the second flow passage groove 241b form a refrigerant flow passage 26 for allowing the refrigerant to flow from the flow passage inlet 261 to the flow passage outlet 262. The flow path inlet 261 and the flow path outlet 262 are disposed at the radially outermost periphery of the armature core 21, and the refrigerant is supplied to the flow path inlet 261 on the side surface of the housing 10 of the rotating electric machine 100 and collected from the flow path outlet 262. Here, the refrigerant is, for example, air or a coolant. The positions of the flow path inlet 261 and the flow path outlet 262 are not limited to the positions shown in FIG. 4 , and it is sufficient that the flow path inlet 261 is located at a position where the refrigerant can be supplied to the refrigerant flow path 26 and the flow path outlet 262 is located at a position where the refrigerant can be collected from the refrigerant flow path 26. For example, the flow path outlet 262 may be located on the radially opposite side of the flow path inlet 261.

[0016] In the rotating electric machine 100 shown in Fig. 1, the frame 11 is divided into two halves, an upper halve and a lower halve, and a first flow path forming plate 24a and a second flow path forming plate 24b are sandwiched between the divided frame 11 and pressurized in the axial direction, and the divided frame 11 is fixed by screwing, adhesive, welding, or melting. The method of fixing the armature 20 to the frame 11 is not limited to the method shown in Fig. 1, and any method that fixes the armature 20 to the frame 11 may be used.

[0017] 5 is an enlarged view of a portion of an example of refrigerant flow path 26 according to the first embodiment shown in the upper diagram of FIG. 4 , showing a portion of first armature core 21a as viewed from below in FIG. 1 . In FIG. 5 , dotted lines indicate the positions of surfaces of first core teeth 211a parallel to the rotation axis, and dotted lines extending radially indicate the positions of first teeth side surfaces 212a, which are teeth side surfaces 212. First flow path groove 241a overlaps first teeth side surface 212a when viewed axially. Similarly, second flow path groove 241b overlaps second teeth side surface 212b when viewed axially. Therefore, refrigerant flow path 26 formed by first flow path groove 241a and second flow path groove 241b overlaps tooth side surface 212, which is a surface of the core teeth parallel to rotation axis 41 that faces another circumferentially adjacent core tooth, when viewed axially. This arrangement makes it easier to remove Joule heat due to copper loss that occurs when current flows through the coil 23 wound around the armature core 21. Furthermore, this arrangement prevents the refrigerant flow path 26 from creating magnetic resistance when the magnetic flux generated when current flows through the coil 23 or the magnetic flux from the permanent magnets 32 of the rotor 30 passes through the armature core 21.

[0018] 1 and 2, the flow path forming plate 24 is disposed in the axial center of the armature core 21, and the flow path forming plate 24 is provided with the refrigerant flow path 26, thereby enabling efficient cooling of the armature 20. Furthermore, the refrigerant flow path 26 is formed by axially aligning the first flow path forming plate 24a, which has the first flow path groove 241a, and the second flow path forming plate 24b, which has the second flow path groove 241b, so that the structure is simple and assembly is easy.

[0019] The shape of the refrigerant flow path 26 is not limited to the shape shown in Fig. 4. Fig. 6 is a schematic diagram showing another example of the refrigerant flow path 26 in embodiment 1, showing the first armature core 21a as viewed from below in Fig. 1. A first flow path groove 241a in a spiral shape drawn in one stroke is provided on a surface of the first flow path forming plate 24a of the first armature core 21a that faces the second flow path forming plate 24b, for allowing the refrigerant to flow from a flow path inlet 261 to a flow path outlet 262. A second flow path groove 241b is provided on a surface of the second flow path forming plate 24b of the second armature core 21b that faces the first flow path forming plate 24a, at a position opposite to the first flow path groove 241a, for allowing the refrigerant to flow from the flow path inlet 261 to the flow path outlet 262. The surface of the first flow passage forming plate 24a including the first flow passage groove 241a and the surface of the second flow passage forming plate 24b including the second flow passage groove 241b are aligned with each other, whereby the first flow passage groove 241a and the second flow passage groove 241b form a refrigerant flow passage 26 for flowing refrigerant from a flow passage inlet 261 to a flow passage outlet 262. Although the area of ​​the refrigerant flow passage 26 varies depending on the circumferential position, the armature 20 can be efficiently cooled because the flow passage forming plate 24 is disposed in the axial center of the armature core 21, as in the example shown in FIG. 4 . Alternatively, two flow passage inlets 261 and two flow passage outlets 262 may be provided, forming semicircular refrigerant flow passages 26. The spiral shape can cool the armature core 21 overall while suppressing an increase in magnetic resistance of each core tooth.

[0020] As described above, the rotating electric machine 100 according to the first embodiment includes the armature 20 and the rotor 30 arranged axially opposite the armature 20 with a magnetic gap therebetween. The armature 20 includes the armature core 21 through which magnetic flux passes, the bobbin 22 that insulates the surface of the armature core 21, the coil 23 wound around the bobbin 22, and the flow path forming plate 24 arranged in the axial center of the armature core 21. The flow path forming plate 24 includes the first flow path forming plate 24a and the second flow path forming plate 24b. The first flow path forming plate 24a has a first flow path groove 241a on a surface facing the second flow path forming plate 24b, and the second flow path forming plate 24b has a second flow path groove 241b on a surface facing the first flow path forming plate 24a at a position facing the first flow path groove 241a. The first flow path groove 241a and the second flow path groove 241b form a refrigerant flow path 26 through which a cooling medium flows, thereby cooling the armature, and the structure is simple and easy to assemble.

[0021] Embodiment 2. Comparing the configuration of a rotating electric machine according to embodiment 2 with the rotating electric machine according to embodiment 1, the basic structure of the rotating electric machine shown in FIGS. 1 and 2 is the same, but the structures of the first armature core 21a and the second armature core 21b are different. FIG. 7 is a diagram for explaining the armature core 21 according to embodiment 2. The upper diagram in FIG. 7 is a perspective view of the first armature core 21a as viewed diagonally from above in FIG. 1, and the lower diagram in FIG. 7 is a perspective view of the second armature core 21b as viewed diagonally from below in FIG. 1. The first armature core 21a according to embodiment 2 includes a plurality of first divided cores 213a arranged in the circumferential direction and a first ring 214a that holds the plurality of first divided cores 213a arranged in the circumferential direction. The first armature core 21a according to embodiment 2 is formed, for example, by fixing the plurality of first divided cores 213a arranged in the circumferential direction and in contact with each other using the first ring 214a by press-fitting or shrink-fitting. Each of the first core segments 213a includes one first core tooth 211a. The first tooth side surface 212a, which is a tooth side surface, is a surface of the first core teeth 211a parallel to the rotation axis 41 that faces the other circumferentially adjacent core teeth, and is a surface of the first core teeth 211a parallel to the rotation axis 41 that extends radially. Similarly, the second armature core 21b includes a plurality of second core segments 213b arranged circumferentially and a second ring 214b that holds the plurality of second core segments 213b arranged circumferentially. The second armature core 21b in the second embodiment is formed, for example, by fixing a plurality of second core segments 213b arranged circumferentially and in contact with each other using the second ring 214b by press-fitting or shrink-fitting. Each of the second core segments 213b includes one second core tooth 211b. The second tooth side surface 212b, which is a tooth side surface, is a surface of the second core tooth 211b that faces other circumferentially adjacent core teeth among the surfaces parallel to the rotation axis 41, and is a surface of the second core tooth 211b that extends radially among the surfaces parallel to the rotation axis 41.

[0022] The end of the first armature core 21a facing the second armature core 21b is the first flow path forming plate 24a, and the first flow path forming plate 24a in the second embodiment is made up of the first ring 214a and the end of the first divided core 213a facing the second divided core 213b. Similarly, the end of the second armature core 21b facing the first armature core 21a is the second flow path forming plate 24b, and the second flow path forming plate 24b in the second embodiment is made up of the second ring 214b and the end of the second divided core 213b facing the first divided core 213a. The flow path forming plate 24 is formed by stacking the first flow path forming plate 24a and the second flow path forming plate 24b, just like in the rotating electric machine 100 according to the first embodiment.

[0023] FIG. 8 is a schematic diagram showing an example of the refrigerant flow path 26 in embodiment 2. The upper view of FIG. 8 is a view of the first armature core 21a viewed from below in FIG. 1 , and the lower view of FIG. 8 is a view of the second armature core 21b viewed from above in FIG. 1 . In the upper view of FIG. 8 , dotted lines indicate the position of a plane parallel to the rotation axis 41 in the first core teeth 211a. Similarly, in the lower view of FIG. 8 , dotted lines indicate the position of a plane parallel to the rotation axis 41 in the second core teeth 211b. A first split core groove 244a for flowing the refrigerant is provided on the surface of the first split core 213a facing the second split core 213b. A second split core groove 244b for flowing the refrigerant is provided on the surface of the second split core 213b facing the first split core 213a, facing the first split core 213a, at a position opposite the first split core groove 244a. In the armature core 21 in which the first armature core 21a and the second armature core 21b are stacked in the axial direction, the first divided core groove 244a and the second divided core groove 244b form a divided core flow path 263 for flowing the refrigerant.

[0024] A first ring groove 245a for flowing refrigerant is provided on the surface of the first ring 214a facing the second ring 214b. A second ring groove 245b for flowing refrigerant is provided on the surface of the second ring 214b facing the first ring 214a, facing the first ring groove 245a. In the armature core 21 in which the first armature core 21a and the second armature core 21b are stacked in the axial direction, the first ring groove 245a and the second ring groove 245b form a flow path inlet 261, a flow path outlet 262, and a relay path 264 connecting adjacent divided core flow paths. As described above, the first divided core groove 244a, the second divided core groove 244b, the first ring groove 245a, and the second ring groove 245b form a refrigerant flow path 26 for flowing refrigerant from the flow path inlet 261 to the flow path outlet 262.

[0025] Note that first divided core groove 244a, which is first flow passage groove 241a, overlaps with first tooth side surface 212a when viewed in the axial direction, and second divided core groove 244b, which is second flow passage groove 241b, overlaps with second tooth side surface 212b when viewed in the axial direction. This arrangement makes it easier to remove Joule heat caused by copper loss when current flows through coil 23 wound around armature core 21. Furthermore, this arrangement prevents refrigerant flow passage 26 from creating magnetic resistance when magnetic flux generated when current flows through coil 23 or magnetic flux from permanent magnet 32 ​​of rotor 30 passes through armature core 21.

[0026] The first ring groove 245a and the second ring groove 245b define a flow path inlet 261, a flow path outlet 262, and a relay path 264 connecting adjacent divided core flow paths, allowing the multiple first divided cores 213a and the multiple second divided cores 213b to have the same shape. Therefore, the first divided cores 213a and the second divided cores 213b can be molded using a molding die with a common shape using powder magnetic cores, thereby reducing initial investment in molds and other components. Furthermore, because the first divided core 213a is fixed to the first ring 214a by press-fitting or shrink-fitting, and the second divided core 213b is fixed to the second ring 214b by press-fitting or shrink-fitting, welding or other techniques are not required to fix the first divided cores 213a and the second divided cores 213b, thereby simplifying the manufacturing process. The first ring 214a and the second ring 214b may be made of a material with high thermal conductivity, such as an aluminum plate, instead of a powder magnetic core to improve cooling performance. Furthermore, for example, by holding the first split core groove 244a with a jig when winding the coil wire around the first split core 213a, and holding the second split core groove 244b with a jig when winding the coil wire around the second split core 213b, bobbin winding can be performed by rotating the first split core 213a or the second split core 213b at high speed, thereby improving productivity during winding.

[0027] Embodiment 3. Comparing the configuration of a rotating electric machine according to embodiment 3 with the rotating electric machine according to embodiment 1, the basic structure of the rotating electric machine shown in FIG. 1 is the same, but the structure of the armature core 21 is different. FIG. 9 is a diagram for explaining the armature core 21 according to embodiment 3, and is a perspective view of the armature core 21 viewed obliquely from above in FIG. 1. The armature core 21 according to embodiment 3 includes a plurality of rectangular teeth 215 arranged in the circumferential direction and a plate 216 that holds the rectangular teeth 215. The plate 216 is a flow path forming plate 24, and is formed by axially aligning a first plate 216a, which is a first flow path forming plate 24a, and a second plate 216b, which is a second flow path forming plate 24b. The plate 216 is disposed in the axial center of the rectangular teeth 215. The rectangular teeth 215 have an axially elongated structure. The tooth side surfaces 212 are surfaces of the rectangular teeth 215 serving as core teeth that are parallel to the rotation axis 41 and that face other rectangular teeth 215 that are adjacent in the circumferential direction, and are surfaces of the rectangular teeth 215 serving as core teeth that extend radially among surfaces that are parallel to the rotation axis 41. The armature core 21 in embodiment 3 is configured such that the rectangular teeth 215 are inserted into holes in the first plate 216 a and the second plate 216 b, the first plate 216 a and the second plate 216 b are aligned at the axial center of the rectangular teeth 215, and the rectangular teeth 215, the first plate 216 a, and the second plate 216 b are fixed together by press fitting or shrink fitting. Figure 10 is a perspective view of the armature core 21 in embodiment 3, showing the state before the first plate 216 a and the second plate 216 b are aligned in the axial direction.

[0028] Fig. 11 is a schematic diagram showing an example of refrigerant flow path 26 in embodiment 3, where the upper diagram in Fig. 11 is a diagram of first plate 216a viewed from below in Fig. 1, and the lower diagram in Fig. 11 is a diagram of second plate 216b viewed from above in Fig. 1. First flow path groove 241a for flowing refrigerant from flow path inlet 261 to flow path outlet 262 is provided on the surface of first plate 216a facing second plate 216b. Second flow path groove 241b for flowing refrigerant is provided on the surface of second plate 216b facing first plate 216a at a position facing first flow path groove 241a. In armature core 21 in which first armature core 21a and second armature core 21b are stacked in the axial direction, first flow path groove 241a and second flow path groove 241b form refrigerant flow path 26 for flowing refrigerant. The radially extending grooves of the first flow groove 241a and the second flow groove 241b are arranged along the holes into which the rectangular teeth 215 are fitted. As a result, when the rectangular teeth 215 and the plate 216 are fixed in the shape shown in FIG. 9 , the first flow groove 241a, the second flow groove 241b, and the surfaces of the rectangular teeth 215 parallel to the axial direction form the radially extending refrigerant flow paths 26, and the refrigerant flowing through the refrigerant flow paths 26 comes into contact with the tooth side surfaces 212. This structure makes it easier to remove Joule heat caused by copper loss when current flows through the coils 23 wound around the armature core 21. Furthermore, this arrangement prevents the refrigerant flow paths 26 from creating magnetic resistance when magnetic flux, generated when current flows through the coils 23 or magnetic flux from the permanent magnets 32 of the rotor 30, passes through the armature core 21.

[0029] By making all the rectangular teeth 215 the same shape, all the rectangular teeth 215 can be molded from powder magnetic cores using a molding die of a common shape, which reduces initial investment in molds, etc. Since multiple rectangular teeth 215 are fitted and fixed to the plate 216, adjustment of the air gap between the armature 20 and the rotor 30 can be managed using a jig in the press-fitting process, simplifying the assembly process. The plate 216 may be made of a material with high thermal conductivity, such as an aluminum plate, to improve cooling performance.

[0030] Although various exemplary embodiments are described in this disclosure, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not illustrated are contemplated within the scope of the technology disclosed in this specification. For example, this includes cases where at least one component is modified, added, or omitted, or where at least one component is extracted and combined with components of another embodiment.

[0031] The above describes in detail preferred embodiments, but the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims.

[0032] Various aspects of the present disclosure are summarized below as appendices.

[0033] (Supplementary Note 1) A rotating electric machine comprising: an armature; and a rotor arranged axially opposite the armature with a magnetic gap therebetween, wherein the armature comprises: an armature core through which magnetic flux passes; a bobbin that insulates the surface of the armature core; a coil wound around the bobbin; and a flow path forming plate arranged in the axial center of the armature core, wherein the flow path forming plate is a first flow path forming plate and a second flow path forming plate aligned in the axial direction, wherein the first flow path forming plate has a first flow path groove on a surface facing the second flow path forming plate, and the second flow path forming plate has a second flow path groove on a surface facing the first flow path forming plate at a position facing the first flow path groove, and wherein the first flow path groove and the second flow path groove form a refrigerant flow path through which a cooling medium flows. (Appendix 2) The rotating electric machine described in Appendix 1 is characterized in that the armature core has a plurality of core teeth arranged circumferentially, and the refrigerant flow path, when viewed from the axial direction, overlaps or contacts with the tooth side surface, which is the surface of the core tooth that is parallel to the rotation axis and faces other circumferentially adjacent core teeth. (Supplementary Note 3) The rotating electric machine according to Supplementary Note 1 or 2, characterized in that the armature comprises a first armature and a second armature, the first armature comprises: a first armature core that is the armature core, a first bobbin that is the bobbin and insulates the surface of the first armature core, and a coil that is a first coil wound around the first bobbin, the second armature comprises: a second armature core that is the armature core, a second bobbin that is the bobbin and insulates the surface of the second armature core, and a coil that is a second coil wound around the second bobbin, an end of the first armature core facing the second armature core is the first flow path forming plate, and an end of the second armature core facing the first armature core is the second flow path forming plate.(Appendix 4) A rotating electric machine according to Appendix 3, characterized in that the first armature core comprises a plurality of first split cores arranged circumferentially and a first ring that holds the first split cores; the second armature core comprises a plurality of second split cores arranged circumferentially and a second ring that holds the second split cores; the first flow path groove comprises a first split core groove on a surface of the first split core facing the second armature core and a first ring groove on a surface of the first ring facing the second armature core; the second flow path groove comprises a second split core groove on a surface of the second split core facing the first armature core and a second ring groove on a surface of the second ring facing the first armature core; the first split core groove and the second split core groove form split core flow paths; and the first ring groove and the second ring groove form a flow path inlet, a flow path outlet, and a relay path connecting adjacent split core flow paths. (Supplementary Note 5) The rotating electric machine according to any one of Supplementary Notes 1 to 4, wherein the armature core is made of a powder magnetic core obtained by compressing and molding powder of a magnetic material. (Supplementary Note 6) The rotating electric machine according to Supplementary Note 1 or 2, wherein the armature core includes a plurality of rectangular teeth arranged in a circumferential direction, and a first plate and a second plate that hold the rectangular teeth, the first plate being the first flow path forming plate, the second plate being the second flow path forming plate, the first flow path groove, the second flow path groove, and a surface of the rectangular teeth parallel to the axial direction form the refrigerant flow path, and the first plate and the second plate are made of aluminum.

[0034] REFERENCE SIGNS LIST 10 Housing, 11 Frame, 12 End plate, 20 Armature, 20a First armature, 20b Second armature, 21 Armature core, 21a First armature core, 21b Second armature core, 22 Bobbin, 22a First bobbin, 22b Second bobbin, 23 Coil, 23a First coil, 23b Second coil, 24 Flow path forming plate, 24a First flow path forming plate, 24b Second flow path forming plate, 25 Wiring plate, 26 Coolant flow path, 30 Rotor, 31 Yoke, 32 Permanent magnet, 40 Shaft, 41 Rotating shaft, 100 Rotating electric machine, 211a First core teeth, 211b Second core teeth, 212 Teeth side surface, 212a First teeth side surface, 212b Second teeth side surface, 213a First split core, 213b Second divided core, 214a first ring, 214b second ring, 215 rectangular teeth, 216 plate, 216a first plate, 216b second plate, 241a first flow path groove, 241b second flow path groove, 244a first divided core groove, 244b second divided core groove, 245a first ring groove, 245b second ring groove, 261 flow path inlet, 262 flow path outlet, 263 divided core flow path, 264 relay path.

Claims

1. A rotating electrical machine comprising a stator and a rotor disposed axially opposite to the stator with a magnetic gap therebetween, wherein the stator includes a stator core through which magnetic flux passes, a bobbin insulating the surface of the stator core, a coil wound around the bobbin, and a flow path forming plate disposed at the axial center of the stator core, the flow path forming plate being formed by aligning a first flow path forming plate and a second flow path forming plate axially, the first flow path forming plate having a first flow path groove on a surface facing the second flow path forming plate, the second flow path forming plate having a second flow path groove at a position facing the first flow path groove on the surface facing the first flow path forming plate, and the first flow path groove and the second flow path groove constituting a refrigerant flow path through which a cooling medium flows.

2. The stator core includes a plurality of core teeth arranged in the circumferential direction, and the refrigerant flow path overlaps or is in contact with a tooth side surface which is a surface facing another core tooth adjacent in the circumferential direction among surfaces parallel to the rotation axis in the core teeth when viewed axially, according to the rotating electrical machine of claim 1.

3. The stator includes a first stator and a second stator, the first stator including a first stator core which is the stator core, a first bobbin which is the bobbin and insulates the surface of the first stator core, and a first coil which is the coil and is wound around the first bobbin, the second stator including a second stator core which is the stator core, a second bobbin which is the bobbin and insulates the surface of the second stator core, and a second coil which is the coil and is wound around the second bobbin, an end portion of the first stator core in the direction of the second stator core being the first flow path forming plate, and an end portion of the second stator core in the direction of the first stator core being the second flow path forming plate, according to the rotating electrical machine of claim 1 or 2.

4. The first armature core is composed of a plurality of first divided cores arranged in the circumferential direction and a first ring for holding the first divided cores. The second armature core is composed of a plurality of second divided cores arranged in the circumferential direction and a second ring for holding the second divided cores. The first flow path groove is composed of a first divided core groove on the surface of the first divided core facing the second armature core and a first ring groove on the surface of the first ring facing the second armature core. The second flow path groove is composed of a second divided core groove on the surface of the second divided core facing the first armature core and a second ring groove on the surface of the second ring facing the first armature core. The first divided core groove and the second divided core groove constitute a divided core flow path, and the first ring groove and the second ring groove constitute a flow path inlet, a flow path outlet, and a relay path connecting the adjacent divided core flow paths. The rotating electrical machine according to claim 3, characterized in that.

5. The armature core is composed of a compacted powder core obtained by compression molding magnetic powder. The rotating electrical machine according to any one of claims 1 to 4, characterized in that.

6. The armature core includes a plurality of rectangular teeth arranged in the circumferential direction, and a first plate and a second plate for holding the rectangular teeth. The first plate is the first flow path forming plate, and the second plate is the second flow path forming plate. The first flow path groove, the second flow path groove, and a plane parallel to the axial direction of the rectangular teeth constitute the refrigerant flow path. The first plate and the second plate are made of aluminum. The rotating electrical machine according to claim 1 or 2, characterized in that.

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