Molded motor, and manufacturing method and disassembly method for molded motor

Abstract

Provided is a molded motor (100) comprising: a rotor (1); an annular stator (2) which is provided on the outer side or inner side of the rotor (1), and to which are provided a plurality of teeth (21) that are lined up in the circumferential direction and that each has a coil (22) wound thereon, and a conductive sheet (4) that are arranged between the coils (22) of adjacent teeth (21) and that protrude from the teeth (21) in the rotational axis direction of the rotor (1); and molded resin (3) molded so as to cover the stator (2). The resin-molded stator (2) is removed from the molded motor (100), and is disassembled by induction heating.

Description

Molded motor, its manufacturing method and disassembly method

[0001] The present disclosure relates to a molded motor, a manufacturing method thereof, and a disassembly method thereof.

[0002] Motors that convert electrical energy into rotational force are used in a variety of applications, including automobiles, railways, industrial equipment, and office equipment. These applications utilize molded motors that are integrally molded from resins with high insulating properties and productivity. Furthermore, from the perspective of protecting the global environment, recovery of valuable resources and recycling of components are important for molded motors after use, and molded motors that are easy to dismantle are required. For example, Patent Document 1 discloses a method in which the coil end portion of a stator is molded while being covered with thermoplastic resin, and then, during dismantling, the thermoplastic resin is heated to melt and apply mechanical stress, making the molded resin removable. Patent Document 2 also discloses a technique for removing the molded resin from a molded motor with a separation tank built into a portion of the winding by repeatedly immersing the motor in a basic aqueous solution and drying it.

[0003] JP-A-2001-197710 JP-A-9-9549

[0004] However, thermosetting resins, which have excellent electrical and mechanical properties, are often used to mold molded motors. Although thermosetting resins have excellent heat resistance, once they harden, they cannot be remelted even when heated, making them difficult to disassemble. Repeated immersion in an aqueous solution containing a base and subsequent drying takes a very long time.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a molded motor that can be easily disassembled without requiring long disassembly processing times even when a thermosetting resin is used, as well as a method for manufacturing a molded motor and a method for disassembling a molded motor.

[0006] The molded motor according to the present disclosure comprises a rotor, a plurality of teeth arranged circumferentially and each having a coil wound thereon, a conductive sheet disposed between the coils of adjacent teeth and protruding from the teeth in the direction of the rotor's rotational axis, an annular stator disposed on the outside or inside of the rotor, and molded resin molded to cover the stator.

[0007] The manufacturing method of the molded motor according to the present disclosure includes the steps of winding coils around or inserting wound coils into multiple teeth on a linear stator, arranging conductive sheets between adjacent coils on the multiple teeth so that they protrude from the teeth in the direction of the rotor's rotational axis, forming the linear stator into a ring shape, molding the ring-shaped stator with resin, and incorporating a rotor inside or outside the molded stator.

[0008] The method for dismantling a molded motor according to the present disclosure includes the steps of removing a stator molded with resin from the molded motor according to the present disclosure, placing the stator in an induction heating coil, applying high frequency to the induction heating coil to inductively heat and decompose the molded resin, and peeling off the molded resin from the multiple teeth and the coils wound around the multiple teeth to dismantle the motor.

[0009] According to the present disclosure, by using induction heating or the like to generate heat not only in the teeth and coils but also in the conductive sheet, the hardened molding resin can be decomposed, allowing for efficient dismantling.

[0010] 1A is a cross-sectional view of a portion of a molded motor according to embodiment 1. FIG. 1B is a side view of the AA' cross section of FIG. 1 according to embodiment 1, extending up to the shaft position. FIG. 1C is a side view of the portion of the molded motor according to embodiment 1, extending from the direction of the arrow in FIG. 1 according to embodiment 1. FIG. 1D is a side view of the AA' cross section of FIG. 1 according to embodiment 1, extending up to the shaft position. FIG. 1E is a side view of the AA' cross section of FIG. 1 according to embodiment 1, extending up to the shaft position. FIG. 6A is a front view of a conductive sheet according to embodiment 1, and FIG. 6B is a side view of the conductive sheet according to embodiment 1. FIG. 7A is a front view of a conductive sheet according to embodiment 1, and FIG. 7B is a side view of the conductive sheet according to embodiment 1. FIG. 8A is a front view of a conductive sheet according to embodiment 1, and FIG. 8B is a side view of the conductive sheet according to embodiment 1. FIG. 9A is a front view of a conductive sheet according to embodiment 1, and FIG. 9B is a side view of the conductive sheet according to embodiment 1. FIG. 1F is a flowchart showing an example of a procedure for a manufacturing method of a molded motor according to embodiment 2. FIG. 1G is a view of a portion of a linear stator according to embodiment 2, viewed from the tip of a tooth. 11A and 11B are cross-sectional views of a portion of a linear stator according to embodiment 2. Fig. 11B is a flow chart showing an example of a procedure for a dismantling method of a molded motor according to embodiment 3. Fig. 11C is a schematic diagram showing an example of a dismantling device for a molded motor according to embodiment 3.

[0011] The following description of the embodiments will be made with reference to the accompanying drawings, in which the same reference numerals are used to designate the same contents and corresponding parts, and detailed description thereof will be omitted.

[0012] 1 is a cross-sectional view of a portion of a molded motor 100 according to a first embodiment, with the molded resin 3 omitted for ease of explanation. The molded motor 100 includes a rotor 1, a plurality of teeth 21 arranged circumferentially and each having a coil 22 wound thereon, a conductive sheet 4 disposed between the coils 22 of adjacent teeth 21 and protruding from the teeth 21 in the direction of the rotational axis of the rotor 1, an annular stator 2 provided on the outside of the rotor 1, and molded resin 3 molded to cover the stator 2. The rotor 1 may be annular, with the stator 2 having the teeth 21 disposed on the rotor side and provided on the inside. The rotor 1 is provided with a shaft 11 serving as a rotation axis, and the shaft 11 is held by bearings 12.

[0013] FIG. 2 is a side view of the AA' cross section of FIG. 1 up to the shaft position. When viewed from the side of the AA' cross section up to the shaft 11, the conductive sheet 4 adjacent to the coil 22, with the insulating paper 5 interposed between them, has protruding portions 41 protruding from one end and the other end of the tooth 21 in the direction of the rotor 1's rotation axis (Z direction in the figure). The conductive sheet 4 has protruding portions 41 protruding from one end and the other end of the tooth 21, and is provided continuously from one end to the other. The coil 22 is formed by winding an insulating-coated wire, and as the number of turns increases, it protrudes from the ends of the tooth 21. The molded resin 3 integrally molds these components that form the stator 2. The resin flows to every corner of the components and hardens to become the molded resin 3, which exists between each component and functions as an adhesive and an insulating material. The protruding portions 41 of the conductive sheet 4 may protrude from only one end of the tooth 21, but it is sufficient that they protrude from at least one end of the tooth 21.

[0014] 3 is a side view of a portion taken from the direction of the arrow in FIG. 1 , showing the teeth 21, coils 22, and conductive sheet 4. For the sake of explanation, the molded resin 3 is omitted. From FIG. 3 , it can be seen that the conductive sheet 4 is provided to protrude from one end and the other end of the teeth 21 in the direction of the rotation axis of the rotor 1 (Z direction in the figure). In FIG. 3 , the conductive sheet 4 protrudes from one end and the other end of the teeth 21 in the direction of the rotation axis of the rotor, and is provided continuously from one end to the other, and the coil 22 also has a coil protrusion 221 protruding from the end of the tooth 21. As shown in FIGS. 4 and 5 , the length L of the protrusion 41 of the conductive sheet 4 is 1 / 2. 41 is the height H of the coil protrusion 221 221 It is sufficient that the height is equal to or greater than the height H3 of the molded resin 3 from the end of the teeth 21.

[0015] By providing a conductive sheet 4 that protrudes from at least one end of the teeth 21 in this manner, when induction heating is used to dismantle the molded motor 100, not only the teeth 21 and coils 22 but also the conductive sheet 4 are heated, and the molded resin 3 in the areas where the teeth 21 and coils 22 are not adjacent can be thermally decomposed.

[0016] The conductive material constituting the conductive sheet 4 may be any material as long as it is conductive, including metals such as copper, aluminum, gold, silver, iron, stainless steel (SUS), brass, and carbon steel, as well as conductive rubber, conductive plastic, and graphene. Effective heating is achieved by generating Joule heat due to eddy current loss and by being magnetic. For example, low-resistivity metals such as gold and silver generate little Joule heat due to eddy currents, so materials with higher electrical resistance than copper are preferred. Specifically, the conductive sheet 4 should preferably be made of a material with an electrical resistance of at least 1.55 x 10-8 Ω·m (0°C), 2.33 x 10-8 Ω·m (100°C), or 3.60 x 10-8 Ω·m (300°C).

[0017] The conductive sheet 4 is a strip-shaped sheet of a conductive material, as shown in Figures 6A and 6B. Metals such as copper, aluminum, gold, silver, iron, stainless steel (SUS), brass, and carbon steel, as well as conductive rubber, conductive plastic, and graphene, which are formed into a sheet, can be used. A resin and a conductive material may be mixed to form a sheet. A magnetic sheet containing magnetic metal powder may also be used.

[0018] 7A and 7B , a conductive portion 42 and an insulating portion 43 may be provided. For example, an insulating portion 43 may be an insulating sheet made of resin, ceramic, or the like, and a conductive material such as metal or graphene may be applied to the conductive portion 42. If one side is made into the insulating portion 43, the placement of the insulating paper 5 can be partially omitted.

[0019] 8A and 8B, insulating portions 43 may be provided on both sides of the conductive portion 42. If both sides are provided with insulating portions 43, insulation can be ensured and the placement of the insulating paper 5 can be omitted in part or in whole. Alternatively, as shown in Figures 9A and 9B, the conductive portion 42 may be provided only on the protruding portion 41. If insulating portions 43 are provided in the portions adjacent to the teeth 21, insulation can be ensured and the placement of the insulating paper 5 can be omitted in part or in whole.

[0020] That is, the entire conductive sheet 4 may be the conductive portion 42, or may include the conductive portion 42 and the insulating portion 43. When the conductive portion 42 and the insulating portion 43 are included, the conductive portion 42 is provided at least on the protruding portion 41 protruding from the tooth 21 in the rotational axis direction. The conductive portion 42 of the conductive sheet 4 may be provided continuously from one end to the other end of the conductive sheet 4, with one or both sides covered by the insulating portion 43. The conductive portion 42 of the conductive sheet 4 may be provided on the protruding portion 41 protruding from the tooth 21 in the rotational axis direction, and the insulating portion 43 may be provided on a non-protruding portion that does not protrude from the tooth 21 in the rotational axis direction. Also, in FIGS. 8A , 8B , 9A , and 9B , insulating portions 43 may be formed on both ends of the conductive sheet 4, and the entire conductive portion 42 may be covered by the insulating portion 43. Covering the entire conductive portion 42 with the insulating portion 43 further ensures insulation, and the insulating paper 5 may be partially or completely omitted.

[0021] When induction heating is performed, if the current penetration depth is too large, there will be areas where the currents flowing in opposite directions on the front and back of the conductive sheet 4 overlap, resulting in a reduction in the current flow due to the mutual cancellation and a decrease in the amount of heat generated. Therefore, it is preferable to ensure an appropriate thickness depending on the frequency of induction heating. For example, in the case of carbon steel, a thickness of 0.6 mm or more at a frequency of 1 kHz, 0.4 mm or more at 10 kHz, and 0.3 mm or more at 100 kHz will ensure a current penetration depth that is efficient for heating. It is also preferable to increase the area so that high-temperature heating can be achieved.

[0022] Furthermore, it is preferable that the conductive sheet 4 does not contact the coil 22. The gap between the coil 22 and the conductive sheet 4 varies depending on the voltage when the motor is driven, but should be at least 0.05 mm. Since adjacent coils 22 are out of phase with each other and a large potential difference is expected, it is preferable to provide a gap of 0.5 mm or more when driven at 300 V, 1.5 mm or more when driven at 600 V, and 3 mm or more when driven at 1000 V. While ensuring a gap allows the molded resin 3 to be interposed during integral molding, it is preferable to place the conductive sheet 4 adjacent to the insulating paper 5. The conductive sheet 4 may be attached to the insulating paper 5 with tape or adhesive, or may be assembled by making a slit.

[0023] The insulating paper 5 may be an insulating sheet, an insulating film, or a nonwoven fabric. In the present disclosure, these are collectively referred to as insulating paper 5. Any one of these may be used alone or in combination of two or more. For example, two or more types can be combined by bonding or laminating them together. Examples of paper include aramid paper, kraft paper, and crepe paper. Examples of insulating films include polyacetal, polyamide, polycarbonate, modified polyphenylene ether, polybutylene terephthalate, polyethylene naphthalate, polysulfone, polyethersulfone, polyphenylene sulfide, polyetheretherketone, polyimide, polyetherimide, polytetrafluoroethylene, tetrafluoroethylene-ethylene copolymer, polyvinylidene fluoride, polyester, polyethylene, polypropylene, nylon, nylon 6,6, vinylon, ethylene vinyl acetate, polyacrylonitrile, polyolefin, and rayon, as well as fluororesins such as polytetrafluoroethylene and polyvinylidene fluoride, liquid crystal polymers, cellulose, and vinylon. The laminated insulating sheets may be those bonded between layers with an acrylic or epoxy adhesive, or a highly thermally conductive adhesive containing a filler. A suitable insulating film having heat resistance and insulating properties is a multi-layer laminate insulating film in which polyethersulfone, polybutylene terephthalate, polyethylene naphthalate, polyimide, or the like is sandwiched between aramid papers.

[0024] The insulating paper 5 ensures insulation between adjacent coils 22. There are no particular limitations on the fixing method. For example, when winding the coils 22 around the teeth 21, the insulating paper 5 sandwiched between the teeth 21 and the coils 22 is extended to wrap around the coils 22 of adjacent teeth 21. It may also be inserted between the coils 22 of adjacent teeth 21. A thickness of 25 μm or more is preferable so that it will not tear when winding the coils 22. To improve insulation performance, it is preferable to make the thickness according to the operating voltage range of the molded motor 100. Two or more sheets may be stacked on top of each other.

[0025] The stator 2 is formed, for example, by stacking multiple electromagnetic steel sheets. The teeth 21 are formed into a shape that allows for easy winding of the windings, forming the stator core. They may be formed from iron or an iron-silicon alloy. They can also be obtained by molding a dust core made of soft magnetic metal powder such as an iron-carbon alloy, or a magnetic powder in which soft magnetic metal oxide powder is coated with a resin binder such as silicone resin. They can also be obtained by molding from a high-density dust core. The molding method may involve cutting out the material, or pressing and laminating electromagnetic steel sheets into the desired shape. Teeth 21 obtained by molding a steel sheet laminate made of laminated silicon steel sheets are preferred. From the perspective of preventing eddy current loss, teeth 21 obtained by molding a steel sheet laminate made of laminated silicon steel sheets with an insulating film formed on their surfaces are more preferred. The thickness of the silicon steel sheets may be approximately 0.2 mm to 0.5 mm.

[0026] The windings forming the coil 22 are, for example, those whose conductor surfaces are covered with an enamel coating. The conductor may be any conductive material, and wires made of copper, aluminum, or the like can be used. Copper is preferably used because it has a low resistance and generates less heat when current flows through it. The conductor coating can be made of polyester, polyurethane, nylon, polyesterimide, polyamideimide, polyimide, polyphenylene sulfide, polyether ether ketone, or the like. Materials with a heat resistance temperature of 155°C or higher are preferred, and polyester, polyesterimide, polyamideimide, polyimide, polyphenylene sulfide, polyether ether ketone, or the like can be used alone or in combination of two or more layers.

[0027] The molding resin 3 is used for purposes such as bonding between windings and dissipating heat during motor operation. Therefore, it is preferable to use a thermosetting resin, which has excellent fluidity during integral molding and high mechanical strength after curing. Examples of thermosetting resins include epoxy resin, unsaturated polyester resin, acrylic resin, phenolic resin, and silicone resin. These resins can be used alone or in combination of two or more. Among these, epoxy resin and unsaturated polyester resin are particularly preferred from the viewpoints of heat resistance, adhesiveness, chemical resistance, and electrical properties. Molding resins made of unsaturated polyester resin are sometimes referred to as bulk molding compounds (BMCs).

[0028] Specific examples of epoxy resins include glycidyl ether epoxy resins such as bisphenol A type epoxy resins, brominated bisphenol A type epoxy resins, hydrogenated bisphenol A type epoxy resins, bisphenol F type epoxy resins, bisphenol S type epoxy resins, bisphenol AF type epoxy resins, biphenyl type epoxy resins, naphthalene type epoxy resins, fluorene type epoxy resins, novolac type epoxy resins, phenol-novolac type epoxy resins, orthocresol-novolac type epoxy resins, tris(hydroxyphenyl)methane type epoxy resins, dicyclopentadiene type epoxy resins, and tetraphenylolethane type epoxy resins; heterocyclic epoxy resins such as glycidyl ester type epoxy resins obtained by condensation of epichlorohydrin and carboxylic acid; and hydantoin type epoxy resins obtained by reaction of triglycidyl isocyanate or epichlorohydrin with hydantoins.

[0029] When an epoxy resin is used, an epoxy resin curing agent is used, and a curing accelerator is also used as needed. The epoxy resin curing agent chemically reacts with the epoxy resin to cure the epoxy resin. Any curing agent that can cure the epoxy resin can be used as appropriate, and the type is not particularly limited. Examples of curing agents include amine-based curing agents such as ethylenediamine and polyamidoamine, and acid anhydride-based curing agents such as phthalic anhydride, hexahydrophthalic anhydride, 4-methylhexahydrophthalic anhydride, tetrahydrophthalic anhydride, 4-methyltetrahydrophthalic anhydride, and tetrabromophthalic anhydride. Further curing agents include phenol novolac resins such as phenol novolac, orthocresol novolac, and bisphenol A novolac, and phenol (biphenylaralkyl) resins such as phenol aralkyl and biphenylaralkyl. Further examples include phenol-based curing agents such as naphthalene skeleton-based condensed polycyclic aromatic phenolic resins and nitrogen- and phosphorus-containing phenolic resins. Curing accelerators are also used to increase the curing speed of the epoxy resin. Any material that can accelerate the curing of the epoxy resin can be used as appropriate, and the type is not particularly limited.

[0030] Unsaturated polyester resins are heat- or light-curable, undergoing addition polymerization of double bonds contained in the molecules with double bonds contained in vinyl compounds and / or allyl compounds under heat or light. Unsaturated polyesters are copolymerizable monomer solutions of unsaturated polyester alkyds, and are produced by reacting unsaturated polybasic acids, saturated polybasic acids, and glycols. Examples of unsaturated polybasic acids include maleic anhydride, fumaric acid, itaconic acid, and citraconic acid. Examples of saturated polybasic acids include phthalic anhydride, isophthalic acid, terephthalic acid, adipic acid, sebacic acid, tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, endomethylenetetrahydrophthalic anhydride, HET acid, and tetrabromophthalic anhydride. Examples of glycols include ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, neopentyl glycol, 1,3-butanediol, 1,6-hexanediol, hydrogenated bisphenol A, bisphenol A propylene oxide compound, dibromo neopentyl glycol, etc. Examples of vinyl compounds or allyl compounds that can be used include styrene, vinyl toluene, divinyl benzene, α-methyl styrene, methyl methacrylate, vinyl acetate, diallyl phthalate, diallyl isophthalate, diallyl tetrabromophthalate, phenoxyethyl acrylate, 2-hydroxyethyl acrylate, 1,6-hexanediol diacrylate, etc.

[0031] Fillers such as silica, talc, calcium carbonate, clay, elastomer, titanium dioxide, alumina, aluminum nitride, boron nitride, silicon carbide, iron oxide, manganese oxide, titanium oxide, zirconium oxide, glass fiber, carbon fiber, and polyamide fiber may be added to the molding resin 3. Depending on the intended use, a reinforcing material may be added at any stage before curing. Colorants such as pigments and dyes, flame retardants, leveling agents, and the like may also be used as the magnet fixing resin.

[0032] In this way, the motor has a rotor 1, a plurality of teeth 21 arranged circumferentially and each having a coil 22 wound around it, a conductive sheet 4 arranged between the coils 22 of adjacent teeth 21 and protruding from the teeth 21 in the direction of the rotational axis of the rotor 1, an annular stator 2 provided on the outside or inside of the rotor 1, and molded resin 3 molded to cover the stator 2. When the stator 2 of the molded motor 100 is dismantled by induction heating, the hardened molded resin 3 can be disassembled by heating not only the teeth 21 and coils 22 but also the conductive sheet 4, allowing for efficient dismantling.

[0033] Furthermore, by providing the conductive sheet 4 so that it protrudes from one end and the other end of the tooth 21 in the direction of the rotation axis of the rotor 1 and is continuous from one end to the other, heat can be generated in a continuous area. 41 The height H of the coil protruding portion 221 of the coil 22 protruding from the tooth 21 in the rotation axis direction is 221 By making the height from the teeth 21 to the end of the molded resin 3 in the direction of the rotation axis equal to or less than H3, it is possible to generate heat in the parts where the teeth 21 and coils 22 are not present when the device is disassembled.

[0034] The conductive sheet 4 includes a conductive portion 42 and an insulating portion 43. The conductive portion 42 is provided at least on the protruding portion 41 protruding from the tooth 21 in the rotational axis direction, allowing the conductive portion 42 to contribute to heat generation while the insulating portion 43 ensures insulation. The conductive sheet 4 is provided continuously from one end to the other, and the conductive portion 42 on one or both sides is covered with the insulating portion 43, ensuring insulation on one or both sides. The conductive portion 42 of the conductive sheet 4 is provided on the protruding portion 41 protruding from the tooth 21 in the rotational axis direction, and the insulating portion 43 is provided on the non-protruding portion that does not protrude from the tooth 21 in the rotational axis direction. This ensures insulation from the tooth 21 while allowing portions without the tooth 21 and coil 22 to generate heat during disassembly. The conductive sheet 4 contacts the coil 22 via at least one of the molded resin 3 and the insulating portion 43, ensuring insulation in portions where the molded resin 3 cannot be interposed during integral molding.

[0035] By making the conductive sheet 4 from metal or graphene, the amount of heat generated by the conductive sheet 4 during disassembly can be increased. By making the mold resin 3 from unsaturated polyester resin or epoxy resin, the characteristics of the motor can be improved.

[0036] In this embodiment, various configuration examples of the conductive sheet 4 are shown, but the configurations of the multiple conductive sheets 4 may all be the same, or some or all of them may be different. The length, width, and thickness may also all be the same, or some or all of them may be different.

[0037] Second Embodiment. A method for manufacturing a molded motor 100 will now be described. Figure 10 is a flowchart showing an example of the steps of a method for manufacturing a molded motor 100 according to the second embodiment. First, coils 22 are wound around multiple teeth 21 on a linear stator 2 (step S101). The wound coils 22 may be inserted. Then, a conductive sheet 4 is placed between adjacent coils 22 on the multiple teeth 21, protruding from the teeth 21 in the direction of the rotation axis of the rotor 1 (step S102). Next, the linear stator 2 is formed into an annular shape (step S103). The annular stator 2 is then molded with resin (step S104). The rotor 1 is then assembled inside or outside the molded stator 2 (step S105).

[0038] Fig. 11 is a view of a portion of the linear stator 2 seen from the tip of a tooth, and Fig. 12 is a view of a portion of the linear stator 2 seen in the cross section B-B' of Fig. 11. In this way, by step S102 of arranging the conductive sheet 4 between adjacent coils 22 of multiple teeth 21 so that it protrudes from the teeth 21 in the direction of the rotation axis of the rotor 1, the conductive sheet 4 having the protruding portion 41 can be provided.

[0039] In a more detailed example, a linear stator 2 was fabricated by laminating and mechanically crimping silicon steel plates (0.3 mm thick) with insulating films on their surfaces. Then, PPS (polyphenylene sulfide) molded insulators 51 were attached to the teeth 21. Furthermore, conductive sheets 4, each with copper conductive portion 42 and a three-layer laminate of Nomex (a registered trademark of DuPont), polyethylene naphthalate, and Nomex insulating portion 43, were positioned protruding from the teeth 21 in the rotation axis direction (Z direction). Next, enameled windings of oxygen-free copper coated with polyamideimide were formed into coils 22. The linear stators 2 were then aligned into a circular shape and placed in a mold. Unsaturated polyester resin containing glass fiber and calcium carbonate was injected and then heated and cured to obtain the stator 2 for the molded motor 100. The conductive sheets 4 were positioned between the coils 22 of adjacent teeth 21 without contacting the coil protrusions 221.

[0040] In this way, coils 22 are wound around a plurality of teeth 21 provided on a linear stator 2, conductive sheets 4 are arranged between adjacent coils 22 of the plurality of teeth 21, protruding from the teeth 21 in the direction of the rotational axis of the rotor 1, the linear stator 2 is formed into a ring shape, the ring-shaped stator 2 is molded with resin, and the rotor 1 is incorporated inside or outside the molded stator 2. This makes it possible to manufacture a molded motor 100 having a stator 2 in which conductive sheets 4 are arranged between adjacent coils 22 of the plurality of teeth 21, protruding from the teeth 21 in the direction of the rotational axis of the rotor 1, and by induction heating the stator 2, it is possible to generate heat not only in the teeth 21 and coils 22 but also in the conductive sheet 4, and the hardened molded resin can be thermally decomposed for efficient dismantling.

[0041] Third Embodiment: A method for dismantling a molded motor 100 will now be described. Figure 13 is a flowchart showing an example of the steps in the dismantling method for a molded motor 100 according to the third embodiment, and Figure 14 is a schematic diagram showing an example of an apparatus for dismantling a molded motor 100. First, the stator 2 molded with resin is removed from the molded motor 100 (step S201). The stator 2 molded with resin is placed in an induction heating coil 61 (step S202). Next, a high frequency is applied to the induction heating coil 61 from a high frequency power supply 62, causing induction heating and decomposing the molded resin 3 (step S203). The molded resin 3 is then separated from the plurality of teeth 21 and the coils 22 wound around the teeth 21, and the motor is dismantled (step S204).

[0042] To confirm the effectiveness, a stator 2 molded with unsaturated polyester resin was induction-heated at a set temperature of 400°C, and the ease of disassembly was compared between the stator 2 of the molded motor 100 according to the present disclosure and a conventional stator. Because the conductive sheet 4 generates heat in addition to the teeth 21 and coils 22, the molded resin 3 was easier to peel off than in the conventional stator. A similar effect was also achieved with a stator 2 molded with epoxy resin. Furthermore, when the conductive sheet 4 was a graphene sheet bonded together with graphene as the conductive portion 42 and epoxy resin as the insulating portion 43, sufficient heat generation was achieved while maintaining insulation. When the conductive sheet 4 was formed by encapsulating a copper sheet in epoxy resin, the molded resin 3 was similarly decomposed by induction heating. It was also confirmed that the teeth 21 and coils 22 peeled from the molded resin 3 could be recycled.

[0043] Although the example of decomposing the molding resin 3 using an induction heating device has been described, it is also possible to use electrical heating by passing electricity through the conductive portion 42 of the conductive sheet 4.

[0044] Although various exemplary embodiments are described in this disclosure, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless variations not illustrated are contemplated within the scope of the technology disclosed in this specification. For example, this includes cases where at least one component is modified, added, or omitted, and even cases where at least one component is extracted and combined with components of another embodiment.

[0045] REFERENCE SIGNS LIST 1 rotor, 2 stator, 3 molded resin, 4 conductive sheet, 5 insulating paper, 11 shaft, 12 bearing, 21 teeth, 22 coil, 41 protrusion, 42 conductive portion, 43 insulating portion, 51 insulator, 61 induction heating coil, 62 high frequency power supply, 100 molded motor, 221 coil protrusion

Claims

1. Rotor and, A plurality of teeth arranged circumferentially, each with a coil wound around it, and a conductive sheet positioned between the coils of adjacent teeth and protruding from the teeth in the direction of the rotor's rotation axis, are provided, and an annular stator is provided on the outside or inside of the rotor, The molded resin covering the stator and A molded motor equipped with [a specific feature].

2. The molded motor according to claim 1, wherein the conductive sheet protrudes from one end and the other end of the teeth in the rotation axis direction of the rotor, and is provided continuously from one end to the other end.

3. The molded motor according to claim 1, wherein the length of the protrusion of the conductive sheet that protrudes from the teeth in the direction of rotation is greater than or equal to the height of the coil protrusion of the coil that protrudes from the teeth in the direction of rotation, and less than or equal to the height from the teeth to the end of the molded resin in the direction of rotation.

4. The molded motor according to claim 1, wherein the conductive sheet comprises a conductive portion and an insulating portion, and the conductive portion is provided on a protruding portion that protrudes from the teeth in at least the direction of rotation axis.

5. The molded motor according to claim 4, wherein the conductive portion of the conductive sheet is provided continuously from one end to the other, and one or both sides are covered with the insulating portion.

6. The molded motor according to claim 4, wherein the conductive portion of the conductive sheet is provided on a protruding portion that protrudes from the teeth in the direction of rotation axis, and the insulating portion is provided on a non-protruding portion that does not protrude from the teeth in the direction of rotation axis.

7. The molded motor according to claim 4, wherein the conductive sheet is in contact with the coil via at least one of the molded resin and the insulating portion.

8. The mold motor according to claim 1, wherein the conductive sheet is made of metal or graphene.

9. The mold motor according to claim 1, wherein the mold resin is composed of an unsaturated polyester resin or an epoxy resin.

10. A process of winding a coil around multiple teeth provided on a linear stator, or inserting a wound coil into them, A step of arranging a conductive sheet between adjacent coils of a plurality of teeth, with the sheet protruding from the teeth in the direction of the rotor's rotation axis, A step of forming the linear stator into an annular shape, A step of molding the annularly formed stator with resin, A step of assembling the rotor inside or outside the molded stator. A method for manufacturing a molded motor equipped with [a specific feature / feature].

11. A step of removing a resin-molded stator from a molded motor according to any one of claims 1 to 9, The steps include: arranging the stator inside the induction heating coil; The process involves applying a high frequency to the induction heating coil and inductively heating it to decompose the molded resin, A step of separating and dismantling the mold resin, the multiple teeth, and the coils wound around the multiple teeth. A method for dismantling a molded motor equipped with [a specific component / feature].