rotor

Abstract

To provide a technology for effectively cooling a rotor used in a rotating electric machine while ensuring appropriate insulation.SOLUTION: A rotor 2 includes a rotor core 20 formed by stacking a plurality of electromagnetic steel plates, and a rotor cooling flow path 30 through which a coolant CLT flows to cool the rotor core 20, and the rotor cooling flow path 30 has an internal rotor cooling flow path 31 that connects from a first end 21, which is one end of the rotor core 20, to a second end 22, which is the other end, and the internal rotor cooling flow path 31 forms a closed flow path in the flow path between the first end 21 and the second end 22.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to rotors, for example rotors having cooling channels. [Background technology]

[0002] Conventionally, there have been known techniques for cooling rotors with cooling fluid in rotating electrical machines such as motors. For example, a technique has been proposed in which gaps are provided between adjacent magnetic steel sheets in the direction of lamination as a rotor core, allowing cooling fluid to flow from a cooling fluid passage toward magnets inserted into magnet insertion holes (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-148746 A Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, the demand for rotating electrical machines such as motors has been growing, and the market demand for high-power motors has also been growing. Since high-power motors tend to generate a lot of heat, there has been a demand for effective cooling technology. In addition, from the viewpoint of ensuring high product quality and safety, there has been a demand for appropriate insulation in the cooling structure.

[0005] The present invention has been made in consideration of the above circumstances, and has an object to provide a technique for effectively cooling a rotor used in a rotating electric machine while also ensuring appropriate insulation. [Means for solving the problem]

[0006] According to the present invention, the following techniques are provided. (1) A rotor body (also called a "rotor core") made by laminating multiple electromagnetic steel sheets; a cooling passage through which a cooling medium for cooling the rotor body flows; having the cooling passage has an internal rotor cooling passage that communicates from a first end that is one end of the rotor body to a second end that is the other end of the rotor body, The rotor, wherein the cooling passage within the rotor defines a closed passage in a passage between the first end and the second end. (2) The rotor according to (1), wherein the cooling passage within the rotor does not have an inlet or outlet for the cooling medium on an outer peripheral surface. (3) The rotor according to (1) or (2), wherein the rotor body has an outer diameter of 50 mm or more and 500 mm or less. (4) The rotor according to any one of (1) to (3), wherein a flow passage wall surface of the cooling flow passage in the rotor is made of resin. (5) The rotor 2 according to any one of (1) to (4), wherein the cooling passage within the rotor has a pipe member penetrating the first end and the second end of the rotor core. (6) the rotor cooling passage includes a plurality of sub-passages penetrating the first end and the second end of the rotor body; The rotor according to any one of (1) to (5), wherein each of the sub-flow passages constitutes a closed flow passage. (7) a first side plate provided at one end (first end) of the rotor (rotor body) in the rotation axis direction; a second side plate provided at the other end (second end) in the rotation axis direction of the rotor; having The cooling passage (rotor cooling passage) is a first side plate cooling passage provided in the first side plate and connected to one end of the rotor cooling passage; a second side plate cooling passage provided in the second side plate and connected to the other end of the rotor cooling passage; A rotor 2 according to any one of (1) to (6), comprising: (8) The rotor body has a shaft attached to a rotating shaft, The shaft is a first shaft extension extending outward from the first end of the rotor body; a second shaft extension extending outward from the second end; a first shaft cooling passage provided in the first shaft extension and connected to the first side plate cooling passage; a second shaft cooling passage provided in the second shaft extension and connected to the second side plate cooling passage; The rotor 2 according to (7) above, (9) The first shaft cooling passage includes: A first shaft center flow passage provided at the center of the rotating shaft; a first shaft radial flow passage extending radially from the first shaft central flow passage; having The first side plate cooling channel comprises: The rotor of claim 8, further comprising a first radial side plate passage that extends radially and connects the first shaft radial passage and the rotor cooling passage. (10) The first shaft cooling passage includes: A first shaft center flow passage provided at the center of the rotating shaft; a first shaft radial flow passage extending radially from the first shaft central flow passage; having The first side plate cooling channel comprises: a first annular passage provided annularly on an outer circumferential side and connected to the rotor internal cooling passage; The rotor of claim 8, further comprising a first radially extending side plate radial passage connecting the first shaft radial passage and the first annular passage. (11) The rotor described in (10), wherein when the first side plate cooling passage distributes the cooling medium, the first side plate radial passage is connected to the first annular passage near where it connects with the first side plate radial passage and is inclined in a direction opposite to a rotational direction of the rotor. (12) The rotor described in (10), wherein when the first side plate cooling flow passage collects the cooling medium, the first side plate radial flow passage is connected to the first annular flow passage at an angle to the rotation direction of the rotor near where it connects to the first side plate radial flow passage. (13) The second shaft cooling passage includes: A second shaft center flow passage provided at the center of the rotating shaft; a second shaft radial passage extending radially from the second shaft central passage; having The second side plate cooling channel comprises: a second side plate radial passage extending radially therethrough connecting the second shaft radial passage and the rotor cooling passage; A rotor according to any one of (8) to (12). (14) The second shaft cooling passage includes: A second shaft center flow passage provided at the center of the rotating shaft; a second shaft radial passage extending radially from the second shaft central passage; having The second side plate cooling channel comprises: a second annular passage provided annularly on the outer periphery side and connected to the rotor internal cooling passage; The rotor according to any one of (8) to (12), further comprising a radially extending second side plate radial passage connecting the second shaft radial passage and the second annular passage. (15) The rotor described in (14), wherein when the second side plate cooling passage distributes the cooling medium, the second side plate radial passage is connected to the second annular passage near where it connects with the second side plate radial passage and is inclined in a direction opposite to a rotational direction of the rotor. (16) The rotor described in (14), wherein when the second side plate cooling passage collects the cooling medium, the second side plate radial passage is connected to the second annular passage near where it connects with the second side plate radial passage and is inclined in the rotation direction of the rotor. (17) A rotor as described in any one of (7) to (16), wherein a liquid-tight seal member is provided at a joint between the shaft and the rotor body, the joint facing the first side plate cooling passage and the second side plate cooling passage. (18) The rotor according to any one of (7) to (17), wherein a liquid-tight seal member is provided at a joint between the shaft and the first and second side plates. (19) The rotor according to any one of (7) to (18), wherein a liquid-tight seal member is provided at a joint between the rotor body and the first and second side plates. (20) The rotor according to any one of (1) to (19), wherein the magnet provided in the rotor body is a permanent magnet embedded in the rotor body. (twenty one) The rotor according to any one of (1) to (19), wherein the magnet provided in the rotor body is a field winding type magnet. (twenty two) The rotor according to any one of (1) to (21), wherein the rotor body is formed by stacking and crimping a plurality of the electromagnetic steel plates. (twenty three) The rotor according to any one of (1) to (21), wherein the rotor body is formed by laminating a plurality of the electromagnetic steel plates with an adhesive. (twenty four) The rotor according to any one of (1) to (23), wherein the cooling medium is water or an aqueous solution. (twenty five) The rotor according to any one of (1) to (23), wherein the cooling medium is cooling oil. Effect of the Invention

[0007] According to the present invention, it is possible to provide a technique for effectively cooling a rotor used in a rotating electric machine and for properly ensuring insulation. [Brief description of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view taken perpendicular to a rotation shaft of a motor according to an embodiment of the present invention. [Diagram 2] 1 is a cross-sectional view taken along a rotation shaft of a motor according to an embodiment of the present invention. [Diagram 3] 1 is a cross-sectional view taken perpendicular to a rotation axis of a rotor according to an embodiment of the present invention. [Figure 4] 1 is a cross-sectional view taken along a rotation axis of a rotor according to an embodiment of the present invention. [Diagram 5] 4 is a diagram illustrating a flow path in a portion where a coolant is introduced at a first end of the rotor core according to the embodiment and distributed to cooling flow paths in the rotor. FIG. [Figure 6] 6A to 6C are diagrams illustrating a first modified example of a rotor cooling passage according to an embodiment. [Figure 7] 11A and 11B are diagrams illustrating a second modified example of the rotor cooling passage of the embodiment. [Figure 8] 11A and 11B are diagrams illustrating a third modified example of the rotor cooling passage of the embodiment. [Figure 9] 11A and 11B are diagrams illustrating a fourth modified example of the rotor cooling passage of the embodiment. [Figure 10] 5A to 5C are diagrams illustrating a sealing structure of a rotor cooling passage according to an embodiment. [Figure 11] 6A to 6C are diagrams illustrating a first modified example of the sealing structure of the rotor cooling passage of the embodiment. [Figure 12] 10A to 10C are diagrams illustrating a second modified example of the sealing structure of the rotor cooling passage of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] <Summary> <Motor 1> In this embodiment, an example in which the rotating electric machine is applied to a motor will be described. Fig. 1 is a cross-sectional view taken perpendicular to a shaft 3 (rotation axis) of a motor 100. Fig. 2 is a cross-sectional view taken along the shaft 3 (rotation axis) of the motor 100. Fig. 3 is a cross-sectional view cut perpendicular to the rotation axis of rotor 2, and is also a diagram showing rotor 2 extracted from Fig. 1. Fig. 4 is a cross-sectional view cut along the rotation axis of rotor 2, and is also a diagram showing rotor 2 extracted from Fig. 2.

[0010] In this embodiment, the rotating electric machine is exemplified by a motor 100. The motor 100 is used, for example, as a drive motor for an automobile.

[0011] The motor 100 has, as its cooling structure, a rotor cooling structure (rotor cooling passage 30) for cooling the rotor 2 and a stator cooling structure for cooling the stator 4. The rotor cooling structure will be mainly described below. In addition, the rotor 2 will be described as having permanent magnets 95 arranged in a V-shape and embedded in the rotor core 20 (also referred to as the "rotor body"), but the arrangement of the permanent magnets 95 may be other than a V-shape. The number of permanent magnets 95 can be determined according to the specifications of the rotor 2 of the motor 100, and may be other than the number illustrated below. Furthermore, instead of the permanent magnets 95, a field winding type magnet may be used as long as the magnet is embedded in the rotor core 20.

[0012] The motor 100 comprises a housing 1 , a shaft 3 , a rotor 2 and a stator 4 . The housing 1 has a housing tubular portion 1a that houses the stator 4 along its outer circumferential surface, and housing end portions 1b that close both axial ends of the housing tubular portion 1a. The housing 1 can be made of a material such as an aluminum alloy (cast metal casting), a resin material, or a combination thereof.

[0013] The shaft 3 is rotatably supported by the housing end 1b via bearings 3a, 3b. In the shaft 3, a region protruding from the first end 21 of the rotor core 20 will be described as a first shaft extension portion 41, and a region protruding from the second end 22 will be described as a second shaft extension portion 42. As will be described in detail later, the shaft 3 has, as components of the rotor cooling passage 30, a first shaft internal cooling passage 61 provided in the first shaft extension portion 41 and a second shaft internal cooling passage 62 provided in the second shaft extension portion 42.

[0014] The stator 4 has a stator core fixed to the housing 1 (the housing cylindrical portion 1a) and a coil 9 assembled to the stator core. More specifically, the stator 4 has an annular yoke portion 6 and a plurality of teeth portions 7 that are integral with the yoke portion 6 and extend toward the rotor 2 side.

[0015] The space between adjacent teeth 7 forms a slot 8, in which a coil 9 is housed and sealed with resin. Additionally, a cooling passage 10 extending in the axial direction is provided in the slot 8 as part of the stator cooling structure. The cooling passage 10 of the stator 4 is connected to the outside via a through hole provided in the housing end 1b.

[0016] The rotor 2 has a rotor core 20 that rotates about a rotation axis (i.e., shaft 3), a plurality of permanent magnets 95 that are provided in the rotor core 20 and extend in the direction of the rotation axis, and a plurality of magnet accommodating portions 29 that are provided in the rotor core 20 and that respectively accommodate the plurality of permanent magnets 95. The outer diameter of the rotor core 20 is, for example, not less than 50 mm and not more than 500 mm.

[0017] Furthermore, the rotor 2 has side plates 5 (also called end plates) provided at the ends of the rotor core 20 in the rotation axis direction. Hereinafter, a more specific description will be given focusing on the rotor 2.

[0018] <Rotor 2> 2 and 4, the rotor 2 of this embodiment has side plates 5 on both ends of the rotor core 20. Specifically, a first side plate 5a is provided at a first end 21 on the left side of the rotor core 20 in the figure, and a second side plate 5b is provided at a second end 22 on the right side of the figure. Although details will be described later, in this embodiment, as the rotor cooling flow passage 30, a coolant CLT (specifically, cooling water) is taken in from one end (first shaft extension portion 41) of the shaft 3, passes through the side plate 5 (first side plate cooling flow passage 51), the rotor core 20 (internal rotor cooling flow passage 31), and the side plate 5 (second side plate cooling flow passage 52) in this order, and is discharged from the other end (second shaft extension portion 42) of the shaft 3.

[0019] <Rotor core 20> The rotor core 20 has a generally cylindrical shape formed by laminating a plurality of magnetic steel sheets each formed into an annular disk shape. The magnetic steel sheets may be laminated and joined by caulking or by using an adhesive.

[0020] Each of the electromagnetic steel sheets constituting the rotor core 20 has a central opening provided at the center, a plurality of rectangular first openings provided near the outer edge, and a plurality of circular second openings provided at regular intervals in the circumferential direction at approximately the middle position of the ring (a position closer to the center than the first openings). When the electromagnetic steel sheets are stacked, the through hole whose central openings are aligned in the axial direction becomes the shaft arrangement hole 25, the first openings become the magnet accommodating portion 29, and the second openings become the flow passage through hole 28. The shaft 3 is attached to the shaft arrangement hole 25. A permanent magnet 95 is accommodated in the magnet accommodating portion 29. The flow passage through hole 28 is provided with an internal rotor cooling flow passage 31 (main flow passage of the rotor cooling flow passage 30) which is a partial structure of the rotor cooling flow passage 30.

[0021] <Permanent magnet 95> The permanent magnet 95 is a rectangular parallelepiped and is housed in the magnet housing portion 29. The permanent magnet 95 is embedded in the rotor core 20 and extends in the axial direction to form a magnetic pole of the rotor 2. A plurality of permanent magnets 95 are provided, and the rotor 2 includes a plurality of magnet sets each consisting of a pair of permanent magnets 95. In this embodiment, the rotor 2 is an eight-pole rotor. The pair of permanent magnets 95 are arranged in a V-shape with the longitudinal direction of each of the rectangular magnets opening outward in the radial direction. A pair of permanent magnets 95 arranged in a V-shape constitutes one magnetic pole.

[0022] The permanent magnet 95 may be a ferrite magnet, an alnico magnet, a rare earth magnet, or the like. As a rare earth magnet, a neodymium magnet composed mainly of neodymium (Nd)-iron (Fe)-boron (B) may be suitably used. Since a neodymium magnet has a high magnetic flux density and a very strong magnetic force, it is suitable for a motor 100 that requires a large output, such as an electric vehicle. Alternatively, a samarium cobalt magnet (SmCo magnet) may be used as the permanent magnet 95 from the viewpoint of corrosion resistance and heat resistance.

[0023] <Side Plate 5 (First Side Plate 5a, Second Side Plate 5b)> The side plate 5 has a first side plate 5a and a second side plate 5b. The first side plate 5a is an annular member attached to the first end 21 of the rotor core 20. The second side plate 5b is an annular member attached to the second end 22 of the rotor core 20. With the first side plate 5a attached, the inner circumferential surface of the first side plate 5a is in close contact with the outer circumferential surface of the first shaft extension 41 of the shaft 3. Similarly, the inner circumferential surface of the second side plate 5b is in close contact with the outer circumferential surface of the second shaft extension 42 of the shaft 3.

[0024] The first side plate 5a and the second side plate 5b are made of, for example, a resin plate (a plate-shaped cured product of a resin composition) or a metal plate, and have the function of preventing the permanent magnets 95 from jumping out by covering the permanent magnets 95 housed in the magnet housing portion 29. The first side plate 5a and the second side plate 5b also function as components of a rotor cooling flow passage 30 that cools the rotor 2. Hereinafter, when there is no need to distinguish between the first side plate 5a and the second side plate 5b, they will be simply referred to as "side plate 5" in the following description.

[0025] The first side plate 5a is provided at the first end 21 so as to completely cover all the magnet housing portions 29 (i.e., the permanent magnets 95). The second side plate 5b is provided at the second end 22 so as to completely cover all the magnet housing portions 29 (i.e., the permanent magnets 95). The first side plate 5a and the second side plate 5b do not have to completely cover the magnet housing portions 29, but it is preferable to adopt a structure that prevents cooling water from penetrating into the rotor core 20 through gaps between the magnet housing portions 29 and the permanent magnets 95, which may lead to water leakage. For example, a structure can be adopted in which the first end 21 and the second end 22 of the rotor core 20 are sealed with resin so as to cover the permanent magnets 95 when they are housed in the magnet housing portions 29, and then the first side plate 5a and the second side plate 5b are attached.

[0026] The thickness of the first side plate 5a and the second side plate 5b is set appropriately depending on the specifications of the motor 100 and the rotor cooling passage 30 (particularly the first side plate cooling passage 51 and the second side plate cooling passage 52), but can be, for example, 5 mm or more and 20 mm or less.

[0027] <Side plate 5 material> The side plate 5 is made of a metal plate or a hardened resin material and is set to have a predetermined strength in order to reliably accommodate the permanent magnet 95 in the magnet accommodating portion 29 and prevent the permanent magnet 95 from shifting or jumping out. When the side plate 5 is a metal plate, the metal used may be, for example, an aluminum alloy or stainless steel. When the side plate 5 is made of a cured resin material, the resin material used is preferably one with good thermal conductivity, and may be one type of resin or a combination of multiple types of resin for each component. For example, one or two types of thermosetting resin selected from the group consisting of epoxy resin and phenol resin may be used.

[0028] Examples of the phenol resin include novolac-type phenol resins such as phenol novolac resin, cresol novolac resin, and bisphenol A novolac resin, and resol-type phenol resin.

[0029] The epoxy resin is not particularly limited in terms of molecular weight or structure, so long as it has two or more epoxy groups in one molecule. Examples of epoxy resins include novolac type epoxy resins such as phenol novolac type epoxy resins and cresol novolac type epoxy resins; bisphenol type epoxy resins such as bisphenol A type epoxy resins and bisphenol F type epoxy resins; aromatic glycidylamine type epoxy resins such as N,N-diglycidylaniline, N,N-diglycidyltoluidine, diaminodiphenylmethane type glycidylamine, and aminophenol type glycidylamine; hydroquinone type epoxy resins; biphenyl type epoxy resins; stilbene type epoxy resins; triphenolmethane type epoxy resins; triphenolpropane type epoxy resins; alkyl-modified epoxy resins; Examples of epoxy resins include epoxy resins such as triphenolmethane type epoxy resins, triazine nucleus-containing epoxy resins, dicyclopentadiene-modified phenol type epoxy resins, naphthol type epoxy resins, naphthalene type epoxy resins, naphthylene ether type epoxy resins, aralkyl type epoxy resins such as phenol aralkyl type epoxy resins having a phenylene and / or biphenylene skeleton, and naphthol aralkyl type epoxy resins having a phenylene and / or biphenylene skeleton, and aliphatic epoxy resins such as alicyclic epoxy resins such as vinylcyclohexene dioxide, dicyclopentadiene oxide, and alicyclic diepoxy-adipade. These may be used alone or in combination of two or more. When an epoxy resin is contained, it is preferable that the epoxy resin contains a structure in which a glycidyl ether structure or a glycidyl amine structure is bonded to an aromatic ring from the viewpoints of heat resistance, mechanical properties, and moisture resistance.

[0030] The epoxy resin preferably contains an epoxy resin having an ICI viscosity of 5 poise or more at 150° C. By setting the ICI viscosity within the above range, the glass transition temperature Tg of the epoxy resin can be increased.

[0031] The curing agent is used for three-dimensional crosslinking when an epoxy resin, which is included as a preferred embodiment of the thermosetting resin, is selected. The curing agent is not particularly limited, but for example, a phenolic resin can be used. Such a phenolic resin-based curing agent is a monomer, oligomer, or polymer having two or more phenolic hydroxyl groups in one molecule, and the molecular weight and molecular structure are not particularly limited. Examples of phenolic resin-based curing agents include novolac-type resins such as phenol novolac resin, cresol novolac resin, and naphthol novolac resin; multifunctional phenolic resins such as triphenolmethane-type phenolic resin; modified phenolic resins such as terpene-modified phenolic resin and dicyclopentadiene-modified phenolic resin; aralkyl-type resins such as phenol aralkyl resins having a phenylene skeleton and / or biphenylene skeleton and naphthol aralkyl resins having a phenylene and / or biphenylene skeleton; bisphenol compounds such as bisphenol A and bisphenol F; and metal naphthenates such as cobalt naphthenate. These may be used alone or in combination of two or more.

[0032] As the inorganic filler, inorganic fillers (fillers and reinforcing fibers) generally used in the technical field of resin compositions used for case materials can be used. Examples of inorganic fillers include fused silica such as fused crushed silica and fused spherical silica, crystalline silica, alumina, kaolin, talc, clay, mica, rock wool, wollastonite, glass powder, glass flakes, glass beads, glass fiber, silicon carbide, silicon nitride, aluminum nitride, carbon black, graphite, titanium dioxide, calcium carbonate, calcium sulfate, barium carbonate, magnesium carbonate, magnesium sulfate, barium sulfate, cellulose, aramid, wood, and pulverized powder obtained by pulverizing a cured product of a phenolic resin molding material or an epoxy resin molding material. Among these, silica such as fused crushed silica, fused spherical silica, and crystalline silica is preferred, and fused spherical silica is more preferred. Among these, calcium carbonate is preferred in terms of cost. As the inorganic filler, one type may be used, or two or more types may be used in combination.

[0033] The content of the inorganic filler can be 80% by mass or more relative to 100% by mass of the total resin composition, which increases the glass transition temperature Tg of the resin composition and provides the motor 100 with characteristics that can fully withstand the operating environment.

[0034] The catalyst (D) is not particularly limited, and examples thereof include phosphine compounds, compounds having phosphonium salts, imidazole compounds, etc., and one or more of these can be used in combination. Among these, imidazole compounds that have particularly excellent catalytic functions when the content of inorganic filler is high as in the above range are preferred. The imidazole compounds are not particularly limited, and examples thereof include 2-ethyl-4-methylimidazole, 2-methylimidazole, 2-ethylimidazole, 2,4-dimethylimidazole, 2-undecylimidazole, 2-heptadecylimidazole, 2-phenylimidazole, 2-phenyl-4-methylimidazole, 1-benzyl-2-methylimidazole, 2-phenyl-4,5-dihydroxymethyl ... Examples of the imidazole include 1-vinyl-5-hydroxymethylimidazole, 1-vinyl-2-methylimidazole, 1-propyl-2-methylimidazole, 2-isopropylimidazole, 1-cyanomethyl-2-methylimidazole, 1-cyanoethyl-2-ethyl-4-methylimidazole, 1-cyanoethyl-2-undecylimidazole, and 1-cyanoethyl-2-phenylimidazole, and one or more of these can be used in combination. Among these, 2-methylimidazole, 2-phenylimidazole, 2-undecylimidazole, and 2-ethyl-4-methylimidazole are preferred. By using an imidazole compound, the glass transition temperature Tg of the epoxy resin can be increased.

[0035] <Rotor cooling passage 30>

[0036] A specific configuration of the rotor cooling passage 30 will now be described. Fig. 5 is a cross section taken along the line A1-A1 in Fig. 4, and shows the passages (i.e., the first shaft cooling passage 61 and the first side plate cooling passage 51) at the first end 21 of the rotor core 20 where the refrigerant CLT is introduced and distributed to the rotor cooling passage 31. In the drawing, the first shaft cooling passage 61 and the first side plate cooling passage 51 are shown painted black.

[0037] The rotor cooling passage 30 has an internal rotor cooling passage 31 that axially penetrates the rotor 2, a first side plate cooling passage 51 and a second side plate cooling passage 52 that are provided in the side plate 5, and a first shaft extension 41 and a second shaft extension 42 that are provided in the shaft 3.

[0038] In the cooling flow passage illustrated in this embodiment, the refrigerant CLT supplied to the inside from the first internal shaft cooling flow passage 61 of the first shaft extension portion 41 passes through the first side plate cooling flow passage 51, the internal rotor cooling flow passage 31, and the second side plate cooling flow passage 52 in that order, and is discharged to the outside from the second internal shaft cooling flow passage 62 of the second shaft extension portion 42.

[0039] <Cooling passage 31 in the rotor (main passage)> The rotor cooling flow passage 31 is provided as a through hole communicating from the first end 21, which is one end of the rotor core 20, to the second end 22, which is the other end. The rotor cooling flow passage 31 forms a closed flow passage in the flow passage between the first end 21 and the second end 22. In other words, the rotor cooling flow passage 31 does not have an inlet or outlet for the cooling medium on the outer circumferential surface 20a of the rotor core 20. Therefore, for example, a flow passage communicating with the outside (outer circumferential surface 20a) is not provided in the flow passage from the first open end 31a on the first end 21 side of the rotor cooling flow passage 31 to the second open end 31b on the second end 22 side of the rotor cooling flow passage 31, and the coolant CLT supplied from the first side plate cooling flow passage 51 to the rotor cooling flow passage 31 all flows to the second side plate cooling flow passage 52.

[0040] The rotor cooling passage 31 is composed of a plurality of sub-passages (here, first to eighth sub-passages 33a to 33h) that penetrate the first end 21 and the second end 22 of the rotor core 20. Each of the first to eighth sub-passages 33a to 33h constitutes a closed passage. The first to eighth sub-passages 33a to 33h are formed at predetermined intervals in the circumferential direction. In other words, when viewed from the outside in the axial direction, the first to eighth sub-passages 33a to 33h are arranged on concentric circles. Note that the first to eighth sub-passages 33a to 33h have the same structure, and when there is no need to distinguish between them, they will be simply referred to as the "rotor cooling passage 31" in the following description.

[0041] The flow passage wall surface 32 of the in-rotor cooling flow passage 31 (i.e., each of the first to eighth sub-flow passages 33a to 33h) is made of resin. Here, the flow passage wall surface 32 is formed by covering the peripheral surface of the flow passage through hole 28 with a predetermined thickness of a cured resin. The cured resin may be one exemplified as the material of the side plate 5, and is formed by insert molding.

[0042] The inner diameter of the rotor cooling passage 31 may be, for example, 1 mm to 10 mm. The thickness of the cured resin may be, for example, 0.3 mm to 3 mm. The rotor cooling passage 31 may be formed by disposing a pipe member that penetrates the first end 21 and the second end 22 of the rotor core 20. The material of the pipe member is not particularly limited, but may be, for example, a resin, a metal, or a composite material thereof.

[0043] <First shaft cooling passage 61, second shaft cooling passage 62> The first shaft cooling passage 61 will be described. The second shaft cooling passage 62 has a similar configuration, and a description thereof will be omitted where appropriate. The first shaft cooling passage 61 has a first shaft central passage 611 and a first shaft radial passages 612.

[0044] The first shaft center flow passage 611 has an opening 61a at the end of the first shaft extension portion 41, and a space having a circular cross section is formed from the opening 61a to the position of the first end 21 of the rotor core 20 at the center of the rotating shaft.

[0045] The first shaft radial channels 612 are channels that are provided radially outward from the first shaft central channel 611 and penetrate the circumferential surface. In this embodiment, eight first shaft radial channels 612a-612h are provided at equal intervals (here, 45 degree intervals) in the circumferential direction. The first shaft radial channels 612a-612h are connected to the first side plate radial channels 512a-512h formed in the first side plate cooling channel 51. When the eight first shaft radial channels 612a-612h are not to be distinguished from one another, they will be simply referred to as the "first shaft radial channels 612".

[0046] The second shaft cooling passage 62 has a second shaft central passage 621 and a second shaft radial passage 622, similar to the first shaft cooling passage 61. The second shaft central passage 621 has a structure similar to the first shaft central passage 611. The second shaft radial passages 622 have a structure similar to the first shaft radial passages 612.

[0047] <First side plate cooling passage 51, second side plate cooling passage 52> The first side plate cooling passage 51 is formed by joining the first side plate 5a, which has a predetermined groove formed in its surface facing the rotor core 20, to the first end 21 of the rotor core 20. In other words, the first side plate cooling passage 51 is provided as a space surrounded by the groove formed in the surface of the first side plate 5a facing the rotor core 20 and the first end 21 of the rotor core 20.

[0048] The first side plate cooling channel 51 has a first annular channel 511 and a first side plate radial channel 512 .

[0049] The first annular passage 511 is formed in an annular shape, and as described above, the first open ends 31a of the in-rotor cooling passages 31 (that is, the first to eighth sub-passages 33a to 33h) are located therein.

[0050] The first side plate radial channels 512 are provided radially to connect the first shaft radial channels 612 and the first annular channel 511. More specifically, the first side plate radial channels 512a-512h are provided to extend in straight lines from the first shaft radial channels 612a-612h, respectively, and connect to the first side plate radial channel 512. The first opening ends 31a of the first to eighth sub-channels 33a-33h are located at positions where the first side plate radial channels 512a-512h and the first annular channel 511 are connected.

[0051] The second side plate cooling passage 52 has a similar structure to the first side plate cooling passage 51, and is formed by joining the second side plate 5b, which has a predetermined groove formed in its surface facing the rotor core 20, to the second end 22 of the rotor core 20. In other words, the second side plate cooling passage 52 is provided as a space surrounded by the groove formed in the surface of the second side plate 5b facing the rotor core 20 and the second end 22 of the rotor core 20.

[0052] The second side plate cooling passage 52 has a second annular passage 521 and a second side plate radial passages 522. The second annular passage 521 is formed in an annular shape, and the second open ends 31b of the in-rotor cooling passages 31 (i.e., the first to eighth sub-passages 33a to 33h) are located therein. The second side plate radial passages 522 are provided radially so as to connect the second shaft radial passages 622 and the second annular passage 521.

[0053] In the rotor cooling passage 30, the coolant CLT introduced from the first shaft central passage 611 of the first shaft cooling passage 61 is distributed to multiple paths by the first shaft radial passage 612. Furthermore, the coolant CLT reaches the first annular passage 511 via the first side plate radial passage 512 of the first side plate cooling passage 51 connected to the first shaft radial passage 612, and flows into the rotor cooling passage 31 (the first to eighth sub-passages 33a to 33h) having the first opening end 31a in the first annular passage 511. The coolant CLT that has cooled the rotor core 20 in the rotor cooling passage 31 passes through the second annular passage 521, the second side plate radial passage 522, and the second shaft radial passage 622 of the second side plate cooling passage 52, and is collected in the second shaft central passage 621 and discharged to the outside. This makes it possible to effectively cool the entire rotor 2. Furthermore, since the rotor cooling passages 31 are provided in the vicinity of the permanent magnets 95 so as to extend in the axial direction in the same manner, heat generated by the permanent magnets 95 can be effectively discharged to the outside.

[0054] Modified examples of rotor cooling passage 30 will be described with reference to Figures 6 to 9. Rotor cooling passage 31 has the same structure as described in Figure 5, and the following will mainly focus on first side plate cooling passage 51, second side plate cooling passage 52, first shaft cooling passage 61, and second shaft cooling passage 62 to describe the differences.

[0055] FIG. 6 is a diagram illustrating a first modified example of the rotor cooling passage 30. In FIG. As the first shaft radial passages 612 of the first shaft cooling passage 61, four first shaft radial passages 612a to 612d are provided which extend radially at 90 degree intervals in the circumferential direction.

[0056] The outer circumferential ends of the first shaft radial channels 612a-612d are connected to the first side plate radial channels 512 of the side plate 5. At this time, each of the first shaft radial channels 612a-612d becomes a channel separated into two V-shaped channels as the first side plate radial channels 512 and connects to the first annular channel 511. That is, the first shaft radial channel 612a is separated into two first side plate radial channels 512a1, 512a2 in the first side plate cooling channel 51 and connected to the first side plate radial channel 512.

[0057] Similarly, the first shaft radial flow passage 612b is separated into two first side plate radial flow passages 512b1 and 512b2 in the first side plate cooling flow passage 51 and connected to the first side plate radial flow passage 512. The first shaft radial flow passage 612c is separated into two first side plate radial flow passages 512c1 and 512c2 in the first side plate cooling flow passage 51 and connected to the first side plate radial flow passage 512. The first shaft radial flow passage 612a is separated into two first side plate radial flow passages 512d1 and 512d2 in the first side plate cooling flow passage 51 and connected to the first side plate radial flow passage 512. By adopting such a structure, the number of flow passages of the first shaft radial flow passage 612 of the shaft 3, which is less affected by heat generation, can be reduced, and the structure of the shaft 3 can be simplified. In particular, since the shaft 3 is made of metal, the number of processing steps can be reduced.

[0058] FIG. 7 is a diagram illustrating a second modified example of the rotor cooling passage 30. As shown in FIG. The rotor cooling passage 30 of this modified example has a structure in which the first annular passage 511 is omitted from the structure described in Fig. 5. That is, the eight first shaft radial passages 612a-612h are connected to the first side plate radial passages 512a-512h, respectively. The outer circumferential ends of the first side plate radial passages 512a-512h are not connected to other passages in the side plate 5, but are connected to the in-rotor cooling passages 31 (the first to eighth sub-passages 33a-33h).

[0059] Similarly, for the second side plate cooling passage 52, the eight second shaft radial passages 622a-622h are connected to the second side plate radial passages 522a-522h, respectively. The outer circumferential ends of the second side plate radial passages 522a-522h are not connected to other passages in the side plate 5, but are connected to the in-rotor cooling passage 31 (the first to eighth sub-passages 33a-33h).

[0060] Such a structure can simplify the structure of the rotor cooling passage 30. As a result, it is easy to ensure the strength of the side plate 5, and the seal structure can also be simplified.

[0061] FIG. 8 is a diagram illustrating a third modified example of the rotor cooling passage 30. In the structure described in FIG. 5, each of the first shaft radial passages 612a-612h is connected in a straight line to each of the first side plate radial passages 512a-512h. In this modified example, the first side plate radial passages 512a-512h are connected at an inclination of 45 degrees in the opposite direction to the rotation direction of the rotor 2. As a result, the outer peripheral end of the first side plate radial passages 512a-512h, i.e., the vicinity of the connection with the first annular passage 511, is connected at an inclination in the opposite direction to the rotation direction of the rotor 2. When the rotor 2 rotates, a centrifugal force acts on the refrigerant CLT. At this time, it is expected that the refrigerant CLT has a property of flowing easily in the centrifugal direction but not easily in the opposite direction. Therefore, as in this modified example, when the first side plate cooling flow passage 51 distributes the refrigerant CLT, by using a flow passage shape (discharge shape) that generates a flow direction by rotational force, it is possible to assisted the flow of the refrigerant CLT inside the rotor 2 rotating at high speed, i.e., the distribution action from the first side plate radial flow passage 512 to the first annular flow passage 511.

[0062] Fig. 9 is a diagram illustrating a fourth modified example of the rotor cooling passage 30. This modified example is an example suitable for a collection side structure rather than the distribution side structure of Fig. 8. Therefore, it will be described here as an example structure of the second side plate cooling passage 52.

[0063] The second side plate radial channels 522a-522h are connected at an inclination of 45 degrees in the rotation direction of the rotor 2. As a result, the outer peripheral ends of the second side plate radial channels 522a-522h, i.e., the vicinity of the connection with the second annular channel 521, are connected at an inclination in the rotation direction of the rotor 2. In this way, when the second side plate cooling channel 52 collects the refrigerant CLT and introduces it to the center side (second shaft center channel 621), the scooping shape can assist the flow of the refrigerant CLT inside the rotor 2 rotating at high speed, i.e., the action of scooping it up from the second annular channel 521 and collecting it toward the center side.

[0064] <Sealing structure> An example of the sealing structure of the rotor cooling passage 30 will be described with reference to FIGS. A first seal member 131 for liquid tightness is provided at the joint between the shaft 3 and the rotor core 20, facing the first side plate cooling passage 51 and the second side plate cooling passage 52. A second seal member 132 for liquid tightness is provided at the joint between the shaft 3 and the side plate 5 (the first side plate 5a and the second side plate 5b). A third seal member 133 for liquid tightness is provided at the joint between the rotor core 20 and the side plate 5 (the first side plate 5a and the second side plate 5b).

[0065] 10, a sealant such as an adhesive or caulking agent is applied as the first seal member 131. A groove of a predetermined depth is provided in the outer peripheral surface of the first shaft extension portion 41, which is in contact with the side plate 5, and an O-ring is disposed in the groove as the second seal member 132. A groove is provided in the outer peripheral surface of the side plate 5 as the third seal member 133, and an O-ring is disposed in the groove. Furthermore, a resin sealing portion 58 is provided in which the periphery of the O-ring is coated and sealed together with the first end portion 21 of the rotor core 20 with resin.

[0066] In the first modification of the sealing structure of FIG. 11, the first to third seal members 131 to 133 are all coated with a sealant such as an adhesive or a caulking agent.

[0067] 12, an O-ring is provided in all of the first to third seal members 131 to 133. In this example, a groove 135 for locating the first seal member 131 is provided in the joint portion between the shaft 3 and the rotor core 20. This groove 135 and the resin sealing portion 58 can be molded integrally when the wall surface of the in-rotor cooling flow passage 31 is molded with resin, for example.

[0068] <Summary of Motor 100 features and functions> The rotor cooling structure (rotor cooling passage 30) of the motor 100 of this embodiment will be described in detail below. (1) A rotor core 20 formed by laminating a plurality of electromagnetic steel sheets; a cooling flow passage (rotor cooling flow passage 30) through which a cooling medium (coolant CLT) for cooling the rotor core 20 flows; having The cooling flow passage (rotor cooling flow passage 30) has an internal rotor cooling flow passage 31 that communicates from a first end 21, which is one end of the rotor core 20, to a second end 22, which is the other end of the rotor core 20, The rotor 2, wherein the rotor cooling passage 31 constitutes a closed passage in a passage between the first end 21 and the second end 22. With this configuration, the coolant CLT can be circulated without waste, and the rotor 2 can be cooled effectively. (2) The rotor according to (1), wherein the rotor-internal cooling passage 31 does not have an inlet / outlet for the coolant CLT on the outer circumferential surface 20a of the rotor core 20. Since the outer peripheral surface 20a of the rotor core 20 does not have an inlet or outlet for the coolant CLT, the cooling structure provided in the rotor core 20 itself can be the only in-rotor cooling flow passage 31 extending in the axial direction, making the overall structure simple. (3) The rotor 2 according to (1) or (2), wherein the rotor core 20 has an outer diameter of 50 mm or more and 500 mm or less. For example, it is suitable as the rotor 2 used in a drive motor for an automobile. (4) The rotor 2 according to any one of (1) to (3), wherein the flow passage wall surface of the rotor internal cooling flow passage 31 is made of resin. By covering the flow passage wall surface of the in-rotor cooling flow passage 31 with resin, it is possible to ensure the insulation of the in-rotor cooling flow passage 31 of the rotor core 20. In addition, by using a resin material with high thermal conductivity, it is possible to effectively transfer the heat of the rotor core 20 to the refrigerant CLT. In addition, since it can be molded integrally with a structure made of other resin, there is also an advantage in terms of manufacturing efficiency. (5) A rotor 2 described in any one of (1) to (4), wherein the rotor cooling passage 31 has a pipe member penetrating the first end 21 and the second end 22 of the rotor core 20. The rotor cooling passage 31 can be manufactured using a pipe member prepared in advance, and the resin molding process can be simplified. (6) The rotor cooling passage 31 includes a plurality of sub-passages (first to eighth sub-passages 33 a to 33 h) that penetrate the first end 21 and the second end 22 of the rotor core 20, The rotor according to any one of (1) to (5), wherein each of the sub-flow passages (first to eighth sub-flow passages 33a to 33h) constitutes a closed flow passage. The plurality of sub-flow paths (first to eighth sub-flow paths 33a to 33h) can be appropriately disposed on the side of the permanent magnet 95, which is a heat source. (7) a first side plate 5a provided at one end (first end 21) of the rotor 2 in the rotation shaft direction; a second side plate 5b provided at the other end of the rotor in the rotation axis direction; having The cooling passage (rotor cooling passage 30) is a first side plate cooling passage 51 provided in the first side plate 5a and connected to one end (first opening end 31a) of the rotor internal cooling passage 31; a second side plate cooling passage 52 provided in the second side plate 5b and connected to the other end (second opening end 31b) of the rotor internal cooling passage 31; A rotor 2 according to any one of (1) to (6), comprising: This structure allows the refrigerant CLT to be distributed and concentrated effectively. (8) The rotor core 20 has a shaft 3 attached to a rotating shaft, The shaft 3 is a first shaft extension portion 41 extending outward from the first end portion 21 of the rotor core 20; a second shaft extension 42 extending outward from the second end 22; a first shaft inner cooling passage (61) provided in the first shaft extension portion (41) and connected to the first side plate cooling passage (51); a second shaft cooling passage (62) provided in the second shaft extension and connected to the second side plate cooling passage (52); The rotor 2 according to (7) above, This structure allows the refrigerant CLT to be distributed and concentrated effectively. (9) The first shaft cooling passage 61 is A first shaft center flow passage 611 provided at the center of the rotation axis; A first shaft radial flow passage 612 extending radially from the first shaft central flow passage 611; having The first side plate cooling channel 51 is The rotor (2) according to (8), comprising a first side plate radial passage (512) extending radially and connecting the first shaft radial passage (612) and the rotor internal cooling passage (31). This structure allows the refrigerant CLT to be distributed and concentrated effectively. (10) The first shaft cooling passage 61 is A first shaft center flow passage 611 provided at the center of the rotation axis; A first shaft radial flow passage 612 extending radially from the first shaft central flow passage 611; having The first side plate cooling channel 51 is a first annular passage 511 that is provided annularly on the outer periphery side and is connected to the rotor cooling passage 31; The rotor (2) according to (8), comprising a first side plate radial passage (512) extending radially and connecting the first shaft radial passage (612) and the first annular passage (511). This structure allows the refrigerant CLT to be distributed and concentrated effectively. (11) A rotor 2 as described in (10), wherein when the first side plate cooling passage 51 distributes the cooling medium, the first side plate radial passage 512 is connected to the first annular passage 511 near where it connects with the first side plate radial passage 512 and is inclined in the opposite direction to the rotational direction of the rotor 2. With this structure, when distributing the refrigerant CLT, an effective refrigerant CLT distribution structure can be realized that takes into account the centrifugal force caused by the rotation of the rotor 2. (12) The rotor 2 described in (10), wherein when the first side plate cooling passage 51 collects the cooling medium, the first side plate radial passages 512 are connected to the first annular passage 511 near where they connect, and are inclined in the direction of rotation of the rotor. With this structure, when the refrigerant CLT is aggregated, an effective scooping structure for the refrigerant CLT can be realized, taking into consideration the centrifugal force caused by the rotation of the rotor 2. (13) The second shaft cooling passage 62 is A second shaft center flow passage 621 provided at the center of the rotation axis; A second shaft radial flow passage 622 extending radially from the second shaft central flow passage 621; having The second side plate cooling channel 52 is a second side plate radial passage (522) extending radially and connecting the second shaft radial passage (622) and the rotor cooling passage (31); A rotor 2 according to any one of (8) to (12). This structure allows the refrigerant CLT to be distributed and concentrated effectively. (14) The second shaft cooling passage 62 is A second shaft center flow passage 621 provided at the center of the rotation axis; A second shaft radial flow passage 622 extending radially from the second shaft central flow passage 621; having The second side plate cooling channel 52 is a second annular passage 521 that is provided annularly on the outer circumferential side and is connected to the rotor inner cooling passage 31; The rotor 2 according to any one of (8) to (12), having a radially extending second side plate radial passage 522 connecting the second shaft radial passage 622 and the second annular passage 521. This structure allows the refrigerant CLT to be distributed and concentrated effectively. (15) A rotor 2 as described in (14), wherein, when the second side plate cooling passage 52 distributes the cooling medium, the second side plate radial passage 522 is connected inclined in the opposite direction to the rotation direction of the rotor 2 near the connection with the second annular passage 521. With this structure, when distributing the refrigerant CLT, an effective refrigerant CLT distribution structure can be realized that takes into account the centrifugal force caused by the rotation of the rotor 2. (16) A rotor 2 as described in (14), wherein when the second side plate cooling passage 52 collects the cooling medium, the second side plate radial passages 522 are connected inclined toward the rotational direction of the rotor 2 near where they connect to the second annular passage 521. With this structure, when the refrigerant CLT is aggregated, an effective scooping structure for the refrigerant CLT can be realized, taking into consideration the centrifugal force caused by the rotation of the rotor 2. (17) A rotor 2 described in any one of (7) to (16), in which a liquid-tight seal member 131 is provided at the joint between the shaft 3 and the rotor core 20, facing the first side plate cooling passage 51 and the second side plate cooling passage 52. (18) The rotor 2 according to any one of (7) to (17), wherein a liquid-tight seal member 133 is provided at a joint between the shaft 3 and the first side plate 5a and the second side plate 5b. (19) The rotor 2 according to any one of (7) to (18), wherein a liquid-tight seal member 132 is provided at a joint between the rotor core 20 and the first side plate 5a and the second side plate 5b. (20) The rotor (2) according to any one of (1) to (19), wherein the magnet provided in the rotor core (20) is a permanent magnet (95) embedded in the rotor core (20). (21) The rotor 2 according to any one of (1) to (19), wherein the magnet provided in the rotor core 20 is a field winding type magnet. (22) The rotor 2 according to any one of (1) to (21), wherein the rotor core 20 is formed by stacking and crimping a plurality of the laminated steel plates. (23) The rotor 2 according to any one of (1) to (21), wherein the rotor core 20 is formed by laminating a plurality of the laminated steel plates with an adhesive. (24) The rotor 2 according to any one of (1) to (23), wherein the cooling medium is water or an aqueous solution. (25) The rotor 2 according to any one of (1) to (23), wherein the cooling medium is cooling oil.

[0069] Although the embodiments of the present invention have been described above, these are merely examples of the present invention, and various configurations other than those described above can also be adopted. [Explanation of symbols]

[0070] 1 case 2 Rotors 3 Shaft 4 Stator 5 Side Plate 5a 1st side plate 5b Second side plate 10 Cooling channel 20 Rotor core 20a Outer surface 21 First end 22 Second end 25 Shaft arrangement hole 28 Flow passage through hole 29 Magnet housing 30 Rotor cooling passage 31 Rotor cooling passage 31a 1st opening end 31b 2nd open end 32 Channel wall 33 Subchannel 41 First shaft extension 42 Second shaft extension 51 First side plate cooling channel 52 Second side plate cooling channel 61 First shaft cooling passage 62 Second shaft cooling passage 95 Permanent Magnets 100 Motor 131 to 133 first to third seal members

Claims

1. A rotor body formed by laminating a plurality of electromagnetic steel sheets; a cooling passage through which a cooling medium for cooling the rotor body flows; having the cooling passage has an internal rotor cooling passage that communicates from a first end that is one end of the rotor body to a second end that is the other end of the rotor body, The rotor, wherein the rotor cooling passage defines a closed passage in a passage between the first end and the second end.

2. The rotor according to claim 1 , wherein the cooling passage within the rotor does not have an inlet or outlet for the cooling medium on an outer peripheral surface.

3. The rotor according to claim 1 or 2, wherein the rotor body has an outer diameter of 50 mm or more and 500 mm or less.

4. 3. The rotor according to claim 1, wherein a flow passage wall surface of the cooling flow passage in the rotor is made of resin.

5. 3. The rotor according to claim 1, wherein the rotor cooling passage comprises a pipe member passing through the first end and the second end of the rotor body.

6. the rotor cooling passage includes a plurality of sub-passages extending through the first end and the second end of the rotor body; The rotor of claim 1 , wherein each of the sub-flow passages defines a closed flow passage.

7. a first side plate provided at one end of the rotor in a rotation axis direction; a second side plate provided at the other end of the rotor in the rotation axis direction; having The cooling flow path includes: a first side plate cooling passage provided in the first side plate and connected to one end of the rotor cooling passage; a second side plate cooling passage provided in the second side plate and connected to the other end of the rotor internal cooling passage; A rotor according to claim 1 or 2, having

8. The rotor body has a shaft attached to a rotating shaft, The shaft is a first shaft extension extending outwardly from a first end of the rotor body; a second shaft extension extending outwardly from the second end; a first shaft cooling passage provided in the first shaft extension and connected to the first side plate cooling passage; a second shaft cooling passage provided in the second shaft extension and connected to the second side plate cooling passage; The rotor of claim 7 , further comprising:

9. The first shaft cooling passage includes: A first shaft center flow passage provided at the center of the rotation shaft; a first shaft radial passage extending radially from the first shaft central passage; having The first side plate cooling channel comprises: a first side plate radial passage extending radially therethrough connecting the first shaft radial passage and the rotor cooling passage; A rotor according to claim 8.

10. The first shaft cooling passage includes: A first shaft center flow passage provided at the center of the rotation shaft; a first shaft radial passage extending radially from the first shaft central passage; having The first side plate cooling channel comprises: a first annular passage provided annularly on an outer circumferential side and connected to the rotor internal cooling passage; The rotor of claim 8 including a first radially extending side plate radial passage connecting said first shaft radial passage and said first annular passage.

11. 11. The rotor according to claim 10, wherein when the first side plate cooling channel distributes the cooling medium, the first side plate radial channel is connected to the first annular channel in a vicinity of the connection with the first side plate radial channel at an angle opposite to a rotational direction of the rotor.

12. 11. The rotor according to claim 10, wherein when the first side plate cooling channel collects the cooling medium, the first side plate radial channels are connected to the first annular channel in a vicinity of where the first side plate radial channels connect to the first annular channel and are inclined in a rotational direction of the rotor.

13. The second shaft cooling passage includes: A second shaft center flow passage provided at the center of the rotation axis; a second shaft radial passage extending radially from the second shaft central passage; having The second side plate cooling channel comprises: a second side plate radial passage extending radially therethrough connecting the second shaft radial passage and the rotor cooling passage; A rotor according to claim 8.

14. The second shaft cooling passage includes: A second shaft center flow passage provided at the center of the rotation axis; a second shaft radial passage extending radially from the second shaft central passage; having The second side plate cooling channel comprises: a second annular passage provided annularly on an outer circumferential side and connected to the rotor internal cooling passage; The rotor of claim 8 including a second radially extending side plate radial passage connecting said second shaft radial passage and said second annular passage.

15. 15. The rotor according to claim 14, wherein when the second side plate cooling channel distributes the cooling medium, the second side plate radial channels are connected to the second annular channel in a vicinity of the connection with the second side plate radial channels at an angle opposite to a rotational direction of the rotor.

16. 15. The rotor according to claim 14, wherein when the second side plate cooling flow passage collects the cooling medium, the second side plate radial flow passages are connected to the second annular flow passage in a vicinity of where the second side plate radial flow passages connect to the second annular flow passage and are inclined in a rotational direction of the rotor.

17. The rotor according to claim 7 , further comprising a liquid-tight seal member provided at a joint between the shaft and the rotor body, the joint facing the first side plate cooling passage and the second side plate cooling passage.

18. The rotor according to claim 7 , further comprising a liquid-tight seal member provided at a joint between the shaft and the first and second side plates.

19. The rotor according to claim 7 , further comprising a liquid-tight seal member provided at a joint between the rotor body and the first and second side plates.

20. 3. The rotor according to claim 1, wherein the magnet provided in the rotor body is a permanent magnet embedded in the rotor body.

21. 3. The rotor according to claim 1, wherein the magnet provided on the rotor body is a field winding type magnet.

22. 3. The rotor according to claim 1, wherein the rotor body is formed by stacking and crimping a plurality of the electromagnetic steel sheets.

23. 3. The rotor according to claim 1, wherein the rotor body is formed by laminating a plurality of the electromagnetic steel plates with an adhesive.

24. 3. A rotor according to claim 1 or 2, wherein the cooling medium is water or an aqueous solution.

25. 3. A rotor according to claim 1 or 2, wherein the cooling medium is cooling oil.

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