Structure

Abstract

To provide a resin structure having a rotor, which has excellent thermal efficiency.SOLUTION: A motor unit 1 includes a stator 13 and a rotor 12 in a housing 20. The housing 20 includes a first resin composition that includes one or more selected from the group of a phenolic resin composition, a thermoplastic engineering plastic molding material, and an epoxy resin composition. The thermal conductivity (laser flash method) of the first resin composition is 0.2 W / m K or more, and the peak of the loss coefficient η obtained by a central vibration method is in the temperature range of 20°C or more and 200°C or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a structure, for example a structure having a stator and a rotor within a housing. [Background technology]

[0002] Structures such as motors are required to handle higher output due to the expansion of electrification of automobiles, for example. To increase output, it is important to improve cooling performance. Generally, in motors that require high cooling performance, the temperature rise caused by the rotation of the rotor is handled by a method in which the entire stator is cooled with oil or a cooling method that has water channels (see, for example, Patent Document 1). In the technology disclosed in Patent Document 1, in a rotating electric machine in which a coil wound concentratedly around the teeth of a stator is housed in a slot between the teeth, multiple pipes extending axially are arranged in parallel in the internal space of the slot, and a resin material is filled into the gaps between these pipes and the gaps between the pipes and the coils to form a resin layer that closes the slots that open toward the inner circumference of the stator, and a coolant is allowed to flow through the pipes. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4496710 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the technology using oil as a refrigerant as a cooling method, there are issues such as the impact on the environment when changing the refrigerant and the decrease in cooling efficiency due to poor thermal conductivity, and a different technology was required. In addition, even in the cooling method with a water channel, the conventional technology was unable to realize direct cooling around the coil, which is the heat source, such as cooling around the outer periphery of the electromagnetic steel sheet, and a new technology was required. In addition, for structures such as motors, for example, in the trend toward electrification of automobiles, a technology that has excellent heat dissipation performance and can respond to miniaturization and weight reduction was required.

[0005] The present invention has been made in consideration of the above circumstances, and has an object to provide a structure having a rotor that is made of resin and has excellent thermal efficiency. [Means for solving the problem]

[0006] The present invention relates to a structure having a stator and a rotor in a housing, the housing is made of a first resin composition; The first resin composition is one or more selected from the group consisting of a phenolic resin composition, a thermoplastic engineering plastic molding material, and an epoxy resin composition; The first resin composition has a thermal conductivity (laser flash method) of 0.2 W / m·K or more, and a peak of the loss factor η determined by the central vibration method exists in a temperature range of 20° C. or more and 200° C. or less. Effect of the Invention

[0007] According to the present invention, it is possible to provide a structure having a rotor, which is made of resin and has excellent thermal efficiency. [Brief description of the drawings]

[0008] [Figure 1] 1 is a vertical cross-sectional view of a motor unit according to a first embodiment, taken along a rotation axis direction. [Diagram 2] FIG. 11 is a vertical cross-sectional view of a motor unit according to a second embodiment, taken along a rotation axis direction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] <<First embodiment>> <Summary> In this embodiment, an example will be described in which the motor unit 1 is applied to an inverter type motor as a rotating electric machine (electric motor, generator, or dual-purpose motor / generator). Fig. 1 is a schematic vertical cross-sectional view of a motor unit 1 in the direction of the rotation axis.

[0010] The inverter-type motor unit 1 (structure) has a stator 13 and a rotor 12 in a housing 20. The housing 20 is made of a first resin composition. Specifically, the first resin composition is made of one or more selected from the group consisting of a phenolic resin composition, a thermoplastic engineering plastic molding material, and an epoxy resin composition. The thermal conductivity of the first resin composition is 0.2 W / m·K or more when measured by a laser flash method, and the peak of the loss factor η determined by a central excitation method is in the temperature range of 20°C or more and 200°C or less. The features of the motor unit 1 will be described in detail below.

[0011] <Structure of motor unit 1> The motor unit 1 has a motor 10 and an inverter unit 50 attached to the upper part of the motor 10 in the drawing, which are cooled by a cooling path 70. The cooling path 70 has a first cooling path 71 that mainly cools the motor 10, and a second cooling path 72 that mainly cools the inverter unit 50.

[0012] <Motor 10> The motor 10 includes a housing 20, and a rotor 12 and a stator 13 housed inside the housing 20. A shaft 11 is attached to the center of the stator 13 as an output shaft, and is rotatably supported by two bearings 14a, 14b on the left and right.

[0013] <Housing 20> The housing 20 has a first housing cover 21, a second housing cover 22, and a third housing cover 23.

[0014] The third housing cover 23 is a cylindrical housing case, and accommodates the rotor 12 and the stator 13 therein. At this time, the stator 13 is attached to the inner peripheral surface of the third housing cover 23.

[0015] The first housing cover 21 is provided in a substantially disk shape, and closes the end opening on the left side in the axial direction of the third housing cover 23. One bearing 14a is attached to the center of the inner surface (the right side in the figure) of the first housing cover 21 to rotatably support the shaft 11.

[0016] The second housing cover 22 is provided in a substantially disk shape, and closes the end opening on the right side in the axial direction of the third housing cover 23. A circular through hole 24 through which the shaft 11 can protrude is provided in the center of the second housing cover 22. The other bearing 14b is attached to the center of the inner surface of the second housing cover 22 (the left surface in the illustration) to rotatably support the shaft 11.

[0017] The material of the bearings 14a, 14b is, for example, high carbon chromium bearing steel or stainless steel, and generally, a material standardized by JIS or the like is used.

[0018] <Shaft 11> The shaft 11 has a cylindrical shape, and is fixed to the center of the rotor 3 as described above. One end (the left side in the figure) of the shaft 11 is rotatably supported by one bearing 14a. The other end of the shaft 11 is rotatably supported by the other bearing 14b. The material of the shaft 11 is, for example, carbon steel, and generally a material specified by the JIS is used.

[0019] <Rotor 12> A plurality of permanent magnets are disposed inside the rotor 12 at equal intervals in the circumferential direction of the shaft. The adjacent permanent magnets are disposed so that their magnetic poles are different from each other.

[0020] <Stator 13> The stator 13 is cylindrical, and is disposed and fixed on the inner periphery of the housing 20 (more specifically, the third housing cover 23) so as to surround the outer periphery of the rotor 12. A minute gap (air gap) is provided between the inner periphery of the stator 13 and the outer periphery of the rotor 12.

[0021] Stator 13 is formed by laminating a plurality of electromagnetic steel sheets, which are thin magnetic bodies. Stator 13 has an array of teeth facing rotor 12. Spaces called slots are provided between each of the teeth. Windings 34 (e.g., distributed windings) are housed in the slots, and high thermal conductive resin sealing parts 36 filled with a second resin composition are provided together with windings 34. The teeth are provided in correspondence with the permanent magnets of rotor 12 described above, and by sequentially exciting each winding 34, rotor 12 rotates due to attraction and repulsion with the corresponding permanent magnets.

[0022] The high thermal conductive resin sealing portion 36 is provided extending in the direction of the rotation axis relative to the outside of the stator 13. Both axial ends 36a, 36b of the high thermal conductive resin sealing portion 36 abut against the first and second housing covers 21, 22, respectively. This allows the heat of the high thermal conductive resin sealing portion 36, i.e., the heat of the windings 34, to be reliably conducted to the first and second housing covers 21, 22.

[0023] Further, each slot is provided with a cooling path 70 (first cooling path 71) described later, and heat generated by the winding 34 is effectively dissipated by a coolant flowing through the cooling path 70. Note that in this embodiment, a configuration in which cooling water W is used as the coolant is illustrated.

[0024] Although there is no particular limitation on the molding method of the highly thermal conductive resin sealing portion 36, insert molding can be used. At this time, a mold structure (nested structure) corresponding to the first cooling path 71 is placed in the slot in which the distributed winding 34 is placed, and insert molding is performed, whereby the highly thermal conductive resin sealing portion 36 and the first cooling path 71 having the desired structure can be made.

[0025] <Inverter section 50> The inverter unit 50 is provided on the outer periphery of the motor 10, more specifically, on the outer periphery surface of the upper side of the third housing cover 23 in the figure.

[0026] The inverter section 50 includes an inverter circuit 51 , an inverter cover 52 , and an inverter case 53 .

[0027] The inverter case 53 is made of resin and has a box shape, and has an inverter circuit 51 attached to its bottom surface. An upper opening of the inverter case 53 is closed by an inverter cover 52. The inverter case 53 may be provided by extending integrally from the third housing cover 23.

[0028] The inverter circuit 51 is, for example, stacked with a power semiconductor chip, a Cu circuit, and a Cu base plate from the upper side, and the power semiconductor chip is sealed with resin. An opening is provided in the bottom surface of the inverter case 53, and the inverter circuit 51 is provided to close the opening. At this time, the lower surface of the Cu base plate, which is a heat dissipation means, is exposed from the opening and is cooled by cooling water W in a cooling path 70 (second cooling path 72) described later.

[0029] <Cooling path 70> The cooling path 70 mainly includes a first cooling path 71 for cooling the motor 10 and a second cooling path 72 for cooling the inverter unit 50 .

[0030] <1st cooling path 71> The first cooling passage 71 is provided so as to communicate with the second housing cover 22 through the highly heat-conductive resin sealing portion 36 of the slot to the first housing cover 21 .

[0031] Specifically, the cooling passage 70 has an inlet portion 71a provided in the second housing cover 22, a circulation portion 71b in the high thermal conductive resin sealing portion 36 of the slot, and a discharge portion 71c provided in the first housing cover 21.

[0032] The circulation portion 71b branches into multiple paths for each slot on the second housing cover 22 side, extends in the axial direction (here, to the left in the figure) at each slot, and is gathered on the third housing cover 23 side to connect to the discharge portion 71c.

[0033] The circulation section 71b may be configured such that one flow path does not branch and circulates through each slot, or multiple flow paths may be provided in each slot. Also, a flow path may not be provided in every slot, but may be provided in every other slot. In any case, it is sufficient if the cross-sectional area and flow path resistance of the flow path are taken into consideration when designing, and the heat generated in the motor 10 can be appropriately discharged to the outside.

[0034] The first cooling path 71 can be provided by introducing a cylindrical part, and can also be obtained by a method of directly molding the resin material when molding the first housing cover 21, the second housing cover 22, and the high thermal conductive resin sealing part 36. In this case, the inner wall of the first cooling path 71 is configured as a part of the hardened resin material (i.e., the second resin composition) filled in the stator. When the first cooling path 71 is provided as a cylindrical part, a non-magnetic metal with high thermal conductivity such as aluminum or an aluminum alloy, or an inorganic material with high thermal conductivity can be used. Furthermore, a cylindrical resin part provided separately from the resin material filled in the slot described above may be used. In addition, the region where the first cooling path 71 is provided is mainly assumed to be the high thermal conductive resin sealing part 36 formed by filling the slot with the second resin composition, but a through hole extending in the axial direction (lamination direction of the electromagnetic steel sheets) may be provided in the yoke part 31 or the tooth part, and the through hole may be used as the first cooling path 71.

[0035] According to the first cooling path 71, the space (i.e., the slot) around the winding 34 is filled with a resin material, which facilitates the transfer of heat. In particular, the winding 34 and the stator 13 are tightly filled with the resin material, and further, the inner wall 10a of the first cooling path 71 is formed of the resin material, which improves the thermal conduction between them. This improves the cooling performance of the stator 13 and reduces copper loss (loss consumed due to the resistance of the winding 34 itself), thereby improving motor output and making the motor unit 1 more compact.

[0036] <Second cooling path 72> The second cooling passage 72 is provided in the third housing cover 23, and has an inlet portion 72a, a circulation portion 72b, and a discharge portion 72c. The cooling water W introduced from the inlet portion 72a passes through the circulation portion 72b and is discharged from the discharge portion 72c.

[0037] The circulation section 72b is open to the outside (upward in the figure) when the inverter section 50 is not attached. When the inverter section 50 is attached, the opening of the circulation section 72b is closed. At this time, the inverter circuit 51 (more specifically, a Cu base plate, which is a heat dissipation means) provided on the bottom surface of the inverter section 50 becomes part of the inner wall surface of the circulation section 72b. As a result, the cooling water W flowing through the circulation section 72b directly cools the inverter circuit 51.

[0038] The cooling water W flowing through the first cooling path 71 and the second cooling path 72 may be the same or different. Also, different coolants (for example, cooling water and cooling oil) may be used.

[0039] In the cooling passage 70, packings, O-rings, seals, etc. required to prevent leakage of the cooling water W are appropriately disposed at the joints of the components that constitute the cooling passage 70.

[0040] <Housing 20 Material> The housing 20 is made of a first resin composition. Specifically, the first resin composition is made of one or more selected from the group consisting of a phenolic resin composition, a thermoplastic engineering plastic molding material, and an epoxy resin composition. The first resin composition appropriately contains a curing agent, an inorganic filler, and the like.

[0041] 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.

[0042] 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.

[0043] The thermoplastic engineering plastic may be one or more selected from the group consisting of polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), syndiotactic polystyrene (SPS) or polyamide (PA).

[0044] 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.

[0045] As the inorganic filler, inorganic fillers (fillers and reinforcing fibers) generally used in the technical field of fixing resin compositions 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.

[0046] <Physical properties of housing 20> The thermal conductivity of the first resin composition measured by a laser flash method is 0.2 W / m·K or more. The lower limit of the thermal conductivity is preferably 0.25 W / m·K or more, and more preferably 0.3 W / m·K or more. The upper limit of the thermal conductivity is not particularly limited from the viewpoint of realizing good thermal conductivity, but may be, for example, 2.0 W / m·K or less as a realistic value. For example, the thermal conductivity of a phenolic resin composition is 0.3 to 0.6 W / m·K, and that of an epoxy resin is 0.8 W / m·K.

[0047] The peak of the loss factor η of the first resin composition exists in a temperature range of 20°C or more and 200°C or less. The loss factor η is determined by a central excitation method (also called a mechanical impedance method). The lower limit of the peak of the loss factor η is preferably 30°C or more, more preferably 50°C or more. The upper limit of the peak of the loss factor η is preferably 175°C or less, more preferably 150°C or less. When the loss factor η is in the above range, the housing 20 exhibits good vibration characteristics.

[0048] The storage modulus (Young's modulus) of the first resin composition is 10 GPa or more. The lower limit of the storage modulus is preferably 15 GPa, more preferably 20 GPa. The upper limit of the storage modulus is preferably as high as possible, but is determined by the type and amount of the base material contained in the first resin composition. For example, there is a material that realizes 50 GPa by containing carbon fiber, etc., and this can be used.

[0049] The content of reinforcing fibers contained in the first resin composition is 30 to 60% by mass. Examples of the reinforcing fibers include glass fibers, carbon fibers, and aramid fibers, which are used in combination depending on the required performance.

[0050] <Materials and properties of the high thermal conductive resin sealing portion 36> The second resin composition which is the material of the high thermal conductive resin sealing portion 36 is a thermosetting resin, and for example, an epoxy resin composition can be suitably used. As the epoxy resin composition, the materials exemplified as the first resin composition can be used. The content of the filler contained in the epoxy resin composition which is the second resin composition is 60 to 95 mass %. As the filler, for example, silica or alumina can be used.

[0051] The second resin composition has a thermal conductivity (measured by a laser flash method) of 0.2 W / m·K or more. The peak of the loss factor tanδ obtained by dynamic viscoelasticity measurement of the second resin composition exists in the temperature range of 100°C to 300°C. The dynamic viscoelasticity measurement is performed using a measuring device "DDV-25GP manufactured by A&D Co., Ltd." at a frequency of 10 Hz in bending mode. The dynamic viscoelasticity measurement below is performed in the same manner. The second resin composition has a storage modulus of 1000 MPa or more.

[0052] <Materials and Properties of Inverter Cover 52 and Inverter Case 53> The inverter cover 52 and the inverter case 53, which are inverter housings, are made of a third resin composition. Specifically, the third resin composition is a thermosetting resin, such as a phenol resin or an epoxy resin.

[0053] The third resin composition has a thermal conductivity (laser flash method) of 0.2 W / m·K or more. The peak of the loss factor tan δ determined by dynamic viscoelasticity measurement exists in the temperature range of 100°C or higher and 300°C or lower.

[0054] <Advantages of the First Embodiment> As described above, according to this embodiment, by making the housing 20 (first housing cover 21, second housing cover 22, third housing cover 23) of the motor 10 and the case of the inverter unit 50 (inverter cover 52 and inverter case 53) from resin, it is possible to improve adhesion to other members and achieve weight reduction. Furthermore, since they are made of resin, they have excellent moldability and processability, which greatly increases the freedom of design, and they can absorb vibrations and reduce noise.

[0055] Furthermore, the motor 10 and the inverter unit 50 can be cooled by the cooling path 70. That is, in the first cooling path 71, the effective cooling in the vicinity of the windings 34 makes forced cooling or air cooling at the outer diameter portion of the stator unnecessary, and as a result, the thermal conductivity required for a metal housing is not necessary, and further weight reduction can be achieved. That is, by using a resin housing, a resin motor can be manufactured.

[0056] Also, cooling path 70 can be installed around winding 34, which is a heat source, and inverter circuit 51. In order to minimize the effect on electromagnetic characteristics, first cooling path 71 is installed in a configuration that extends in the axial direction in the slot portion on the inner diameter side of winding 34, and first cooling path 71 is molded in one piece using a highly thermally conductive resin, and by utilizing the moldability and processability of this resin molded body, it is possible to achieve further compactness and weight reduction, and to improve the freedom of design.

[0057] <<Second embodiment>> A motor unit 1A of the present embodiment will be described with reference to Fig. 2. The motor unit 1A of the present embodiment has a configuration in which a gear unit 60 is added to the motor unit 1 of the first embodiment. Below, different parts will be described, and a description of similar configurations, functions, etc. will be omitted.

[0058] The motor unit 1A has a gear portion 60 on the output side of the shaft 11, i.e., in the region on the right side in the figure. The gear portion 60 has a gear housing 62 provided on the right side of the second housing cover 22, a planetary gear 61 connected to the shaft 11, and a reducer output shaft 63 that outputs rotation reduced by the planetary gear 61. The reducer output shaft 63 is provided in the gear housing 62 coaxially with the shaft 11. Note that the second housing cover 22 may be omitted, and a structure may be adopted in which the gear housing 62, together with the gear portion 60, seals the inside of the motor 10.

[0059] The gear housing 62 is made of a fourth resin composition, specifically, a phenol resin or an epoxy resin. The fourth resin composition may be made of the same material as the first resin composition.

[0060] The motor unit 1A of this embodiment provides the same effects as those of the first embodiment. Furthermore, by integrally forming the planetary gear 61 of the gear section 60 and the housing 20 of the motor 10 from a resin composition, the motor unit 1A can be made smaller and lighter. The gear section 60 is not limited to the above-mentioned configuration in which the reducer output shaft 63 and the shaft 11 are coaxial using the planetary gear 61, but may be configured as two shafts using a connecting gear.

[0061] <Summary of features and functions of motor unit 1 (structure)> The features of the first and second embodiments will be summarized. (1) The motor unit 1 has a stator 13 and a rotor 12 housed in a housing 20. The housing 20 is made of a first resin composition, and the first resin composition is made of one or more selected from the group consisting of a phenolic resin composition, a thermoplastic engineering plastic molding material, and an epoxy resin composition. The thermal conductivity (laser flash method) of the first resin composition is 0.2 W / m K or more, and the peak of the loss factor η determined by the central vibration method exists in the temperature range of 20°C or more and 200°C or less. (2) The first resin composition has a storage modulus (Young's modulus) of 10 GPa or more. (3) The content of reinforcing fibers contained in the first resin composition is 30 to 60 mass %. (4) The slots 35 of the stator 13 are filled with a second resin composition (i.e., high thermal conductive resin sealing portion 36). The second resin composition is an epoxy resin composition, the thermal conductivity of which (laser flash method) is 0.2 W / m K or more, and the peak of the loss factor tan δ determined by dynamic viscoelasticity measurement is in the temperature range of 100°C or more and 300°C or less. (5) The second resin composition has a storage modulus of 1000 MPa or more. (6) The second resin composition contains a filler in an amount of 60 to 95% by mass. (7) The second resin composition has a boiling water absorption of 0.4% or less. (8) The inverter housing (inverter cover 52, inverter case 53) further includes an inverter section 50 housing an inverter circuit 51. The inverter housing (inverter cover 52, inverter case 53) is made of a third resin composition made of a phenolic resin or an epoxy resin, and has a thermal conductivity (laser flash method) of 0.2 W / m·K or more, and a peak of the loss factor tan δ determined by dynamic viscoelasticity measurement is in the temperature range of 100°C or more and 300°C or less. (9) The rotor 12 further includes a gear unit 60 having a connecting gear 61 housed within a gear housing 62, the connecting gear 61 being connected to the shaft 11 attached to the rotor 12. The gear housing 62 is made of a fourth resin composition made of a phenolic resin or an epoxy resin, the thermal conductivity of which (laser flash method) is 0.2 W / m K or more, and the peak of the loss factor tan δ determined by dynamic viscoelasticity measurement is in the temperature range of 100°C or more and 300°C or less. (10) The stator 13 (more specifically, the slots) further includes a first cooling passage 71 extending in the rotation axis direction. (11) The housing 20 has a cylindrical third housing cover 23 that covers the periphery of the stator 13, and first and second housing covers 21, 22 that are arranged to cover the opening of the third housing cover 23, and each of the first and second housing covers 21, 22 is provided with bearings 14a, 14b that support the shaft 11 of the rotor 12 so as to be able to rotate freely. (12) The high thermal conductive resin sealing portion 36 extends toward the outside of the stator 13 in the direction of the rotation axis, and the axial ends 36a, 36b of the second resin composition abut against the first and second housing covers 21, 22.

[0062] 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. EXAMPLES

[0063] The present invention will now be described with reference to examples. A structure (motor unit) in which the high thermal conductive resin sealing portion 36 (made of the second resin composition) of the embodiment was produced using the materials of Examples 1 to 4 was evaluated.

[0064] Table 1 shows the physical property values ​​of Examples 1 to 4, and Table 2 shows the blending ratios (mass%) of the raw materials used to prepare the second resin composition. The raw materials and product names are as follows. (A) Filler Alumina (cut point 55μm) Silica (spherical silica) (B) Epoxy resin 1 (biphenyl type epoxy resin / Mitsubishi Chemical Corporation, "YX4000") Epoxy resin 2 (bisphenol A type epoxy resin / Mitsubishi Chemical Corporation, "jER1001") (C) Hardener Phenol resin 1 ("MEH-7500" manufactured by Meiwa Kasei Co., Ltd.) Phenol resin 2 ("MEH-7851SS" manufactured by Meiwa Kasei Co., Ltd.) Phenolic resin 3 (phenolic novolac resin / Sumitomo Bakelite Co., Ltd. "PR-55617") Phenolic resin 4 (phenolic novolac resin / Sumitomo Bakelite Co., Ltd. "PR-51714") (D) Coupling agent (phenylaminopropyltrimethoxysilane / Dow Corning Toray Co., Ltd. "CF4083") (E) Catalyst (triphenylphosphine (TPP)) (F) Colorant (Carbon Black / Mitsubishi Chemical Corporation "Carbon #5") (G) Release agent (Carbana wax / "Nikko Carbana" manufactured by Nikko Rica Corporation)

[0065] In all of Examples 1 to 4, good thermal conductivity was confirmed, and good molding was also demonstrated when forming the cooling path 70 (first cooling path 71). This confirmed that the first cooling path 71 of the high thermal conductive resin sealing portion 36 effectively dissipates heat generated by the winding 34.

[0066] [Table 1] [Table 2]

[0067] Regarding the first, third and fourth resin compositions of the embodiment, resin compositions (housing 20, inverter housing (inverter cover 53, inverter case 53), gear housing 62) having the physical property values ​​shown in Table 3 were made and the strength characteristics and thermal conductivity were evaluated, and good results were obtained as components of the motor 10. The raw materials of the first resin composition and the fourth resin composition are the same.

[0068] [Table 3] [Explanation of symbols]

[0069] 1, 1A motor unit 10 Motor 11 Shaft 12 Rotor 13 Stator 14a, 14b, 64 bearings 20. Housing 21 First housing cover 22 Second housing cover 23 Third housing cover 24 Through hole 31 York 33 Slots 34 Winding (coil) 35 Slot section 36 High thermal conductive resin sealing part 50 Inverter section 51 Inverter circuit 52 Inverter cover 53 Inverter case 60 Gear section 61 Planetary Gear 62 Gear housing 70 Cooling path 71 1st cooling path 71a Introduction 71b Circulation section 71c Discharge section 72 Second cooling path 72a Introduction 72b Circulation section 72c Discharge section W cooling water

Claims

1. A structure having a stator and a rotor within a housing, an inverter unit having an inverter circuit housed in an inverter housing; a cooling water passage provided on a side surface of the housing; having a bottom surface of the inverter unit constitutes a part of a wall surface of the cooling water passage, the housing is made of a first resin composition; The first resin composition is one or more selected from the group consisting of a phenolic resin composition, a thermoplastic engineering plastic molding material, and an epoxy resin composition; The thermal conductivity (laser flash method) of the first resin composition is 0.2 W / m K or more, and the peak of the loss factor η measured by the central vibration method is in a temperature range of 20° C. or more and 200° C. or less; The storage modulus of the first resin composition is 10 GPa or more, the inverter housing is made of a third resin composition made of a phenolic resin or an epoxy resin; The third resin composition has a thermal conductivity (laser flash method) of 0.2 W / m K or more, and a peak of a loss factor tan δ determined by dynamic viscoelasticity measurement (frequency 10 Hz bending mode) exists in a temperature range of 100° C. or more and 300° C. or less.

2. The content of reinforcing fibers contained in the first resin composition is 30 to 60% by mass. The structure of claim 1.

3. the slots of the stator are filled with a second resin composition; the second resin composition is an epoxy resin composition, The second resin composition has a thermal conductivity (laser flash method) of 0.2 W / m K or more, and a peak of a loss factor tan δ determined by dynamic viscoelasticity measurement (frequency 10 Hz bending mode) exists in a temperature range of 100° C. or more and 300° C. or less.

3. The structure according to claim 1 or 2.

4. The storage modulus of the second resin composition is 1000 MPa or more. The structure of claim 3.

5. The content of the filler contained in the second resin composition is 60 to 95 mass%.

5. The structure according to claim 3 or 4.

6. The boiling water absorption rate of the second resin composition is 0.4% or less. A structure according to any one of claims 3 to 5.

7. a gear portion in which a gear connected to a rotating shaft attached to the rotor is housed in a gear housing, the gear housing is made of a fourth resin composition made of a phenolic resin or an epoxy resin; The fourth resin composition has a thermal conductivity (laser flash method) of 0.2 W / m K or more, and a peak of a loss factor tan δ determined by dynamic viscoelasticity measurement (frequency 10 Hz bending mode) exists in a temperature range of 100° C. or more and 300° C. or less. A structure according to any one of claims 1 to 6.

8. The stator further includes a cooling water passage extending in the direction of the rotation axis. A structure according to any one of claims 1 to 7.

9. The housing includes a cylindrical housing case that covers the periphery of the stator, and first and second housing covers that are provided to close an opening of the housing case. Each of the first and second housing covers is provided with a bearing that rotatably supports a rotation shaft of the rotor. A structure according to any one of claims 1 to 8.

10. The second resin composition is provided to extend toward the rotation axis direction with respect to an outside of the stator of the stator, and an axial end portion of the second resin composition is in contact with the first and second housing covers.

10. The structure of claim 9 when dependent on any one of claims 3 to 6.

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