KR20170059777A - Case for electric motor and electric motor including the same - Google Patents

Abstract

A case for a motor is provided. In the case for a motor for accommodating a stator and a rotor inside, the case for a motor according to an exemplary embodiment of the present invention is formed through the injection molding of a graphite substrate including a matrix and a graphite-nanometal composite which is dispersed on the matrix and is formed by combining nanomaterial particles on the surface of graphite. Accordingly, the present invention can obtain a high electromagnetic shielding effect and a high heat dissipation property.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case for a motor,

More particularly, the present invention relates to a case for a motor which is lightweight, has a low production cost, and is excellent in heat dissipation by fabricating a case using a graphite composite material having an excellent heat radiation characteristic and an electromagnetic wave shielding effect, To an electric motor.

Generally, an electric motor includes a rotor having a magnet coupled thereto and a stator having a coil wound thereon, and uses a magnetic flux generated by a current applied to a coil of the stator and a power generated by a rotor rotating due to electromagnetic induction of the rotor Device.

These electric motors generate heat by energy loss caused by iron hysteresis, eddy currents, and mechanical friction in the process of converting electrical energy into mechanical energy.

This heat loss causes the function of the motor to be deteriorated and it is necessary to release the heat generated by the motor.

For this purpose, cooling oil is used in the case of large motors, but cooling oil can not be used in the case of small motors because of space problems. In addition, the cooling oil has been exhausted after a predetermined period of time has elapsed and has to be refilled, and cooling efficiency is not sufficient with cooling oil alone.

On the other hand, in the case of an electric motor, a case is generally made of a material such as aluminum or a metal such as aluminum, a stator and a rotor for power generation are disposed inside the case, and then a cover is coupled to the case.

Accordingly, when the case is made of a metal material such as aluminum, it is difficult to exhibit an electromagnetic wave shielding effect. Therefore, it is difficult to reduce the size or thickness of the device because an electromagnetic wave shielding member must be included in the device. There are heavy drawbacks.

In addition, when the case is made of plastic, it is very light and easy to handle. However, since there is no heat dissipation effect in the plastic itself, a separate cooling means for heat dissipation such as cooling oil is necessary. There is a problem in that it is difficult to perform the function of the protective case due to the brittleness due to the problem that can not be achieved and the damage due to the external impact.

KR 10-2011-0101517 A

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to provide a motor case having a lightweight, low production cost, excellent heat dissipation capability and electromagnetic wave shielding effect by constituting a case by injection molding a graphite base material including a graphite- And an electric motor including the same.

In addition, the present invention provides a motor case and a motor case including the graphite-nano-metal composite body, which can improve the breakage problem due to brittleness by embedding a reinforcing supporter in a graphite base material including the graphite- There are other purposes to provide.

In order to solve the above problems, the present invention provides a motor case for accommodating a stator and a rotor therein, the case comprising: a matrix; a graphite-dispersed graphite particle dispersed on the matrix and having nanometer- There is provided a casing for a motor in which a graphite base material comprising a nano metal complex is formed through injection molding.

In addition, the nano-metal particles may be crystallized nanoparticles.

In addition, the graphite-nano-metal composite may further include a poly-dopamine layer coated on the nano-metal particles, and the thickness of the poly-dopamine layer may be 5 to 1000 nm.

In addition, the graphite-nano metal composite may be contained in the graphite substrate in an amount of 50 to 80% by weight.

In addition, the case may be provided with a protective coating layer on the outer surface thereof, and the protective coating layer may be formed of a composition for forming a protective coating layer containing a polymer resin, thereby protecting the graphite substrate and having environmental resistance and insulation.

The polymer resin may be selected from the group consisting of epoxy, polyethylene, polypropylene, polystyrene, polyvinyl chloride, nylon, silicone, polyester, phenol, polyester, polyimide and polyurethane And may include at least one selected resin.

In addition, the protective coating layer forming composition may include an epoxy resin and a carbon-based filler to improve the thermal diffusion to the outside. At this time, the carbon-based filler may be selected from the group consisting of a single-walled carbon nanotube, a double-walled carbon nanotube, a multi-walled carbon nanotube, a graphene, a graphene oxide, a graphene nanoplate, a graphite, And the like.

The case may include a reinforcing support member made of a metal material and embedded in the graphite base member, and the graphite base member and the reinforcing support member may be integrally formed through an insert molding.

The reinforcing support may include either magnesium or aluminum.

The reinforcing supporter may include a frame member and a connecting member having both ends connected to the frame member.

Further, the connecting member may have a lattice shape, a honeycomb shape, a straight shape, a curved shape, and a shape in which they are mutually combined.

In addition, the graphite base may be provided with at least one fastening hole for fastening with other parts, and the fastening hole may be formed so as to be positioned directly above the reinforcing support.

On the other hand, the present invention provides a stator comprising at least one stator including a coil wound on a core; A rotor disposed inside the stator; The above-described case having a receiving space for accommodating the stator and the rotor; And an end cap coupled to the open end of the case.

According to the present invention, a graphite base material including a graphite-nano metal composite body is used to manufacture a case through injection molding, so that it is light in weight, has a low production cost, is excellent in heat radiation property, and has an electromagnetic wave shielding effect.

In addition, a reinforcing support is embedded in a graphite base material including a graphite-nano metal composite to manufacture a case through insert molding, thereby improving breakage due to brittleness and enhancing fastening properties with other components.

Furthermore, the present invention can improve the durability, environmental resistance and heat radiation property by forming the protective coating layer on the outer surface of the graphite substrate.

1 shows a motor to which a motor case according to the present invention is applied,
Fig. 2 is a view showing the arrangement relationship of the graphite base and the reinforcing supporter constituting the motor case according to the present invention, and is a partial cutaway view showing a part of the motor case of Fig. 1,
Fig. 3 is a cross-sectional view showing a detailed configuration of a motor case according to the present invention,
FIG. 4 is an exemplary view showing various shapes of a reinforcing supporter applied to a motor case according to the present invention,
5 is an exemplary view showing various shapes of a motor case according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

Referring to FIG. 1, a general electric motor 1 includes a stator 10, a rotor 20, a case 100, 200, 300, an end cap 30, and the like.

The rotor 20 has at least one permanent magnet 24 disposed around a rotation axis 22 having a predetermined length and is rotatably disposed inside the case 100,

The stator 10 includes a plurality of unit stator including a core and a coil 12 wound around the core and is disposed so as to surround the circumference of the rotor 20, 12 to rotate the rotor 20 by induced electromotive force. The stator 10 is fixedly coupled to the inside of the case 100, 200,

The case (100, 200, 300) is provided with a hollow space having a predetermined space therein so that the stator (10) and the rotor (20) can be received therein. At least one side of the case 100, 200, or 300 is opened to allow the stator 10, the rotor 20, and the like to be disposed in the space. And, the open end of the case (100, 200, 300) is sealed through the end cap (30).

Accordingly, when power is applied to the coil of the stator 10, the magnetic flux generated by the applied power source and the power generated by the rotation of the rotor by the electromagnetic induction of the rotor can be used.

Since the stator 10, the rotor 20, and the end cap 30 are of a general structure constituting the electric motor, detailed description thereof will be omitted. In addition, it is apparent that a reducer, various sensors, circuit boards, and the like for improving the operation and performance of the motor, as well as the stator 10 and the rotor 20, may be additionally disposed in the case 100, 200,

The motor case 100, 200, 300 according to the present invention is applied to the electric motor 1 described above and accommodates the stator 10 and the rotor 20 disposed therein to protect the stator 10 and the rotor 20 from the external environment, And a heat radiation function for discharging heat generated by loss of energy in the process of converting electrical energy into mechanical energy to the outside.

Accordingly, the motor case (100, 200, 300) according to the present invention simplifies the construction of the electric motor since heat generated during operation of the motor is discharged to the outside, .

Particularly, when the electric motor is a small motor such as a traction motor, it is unnecessary to separate cooling means or heat dissipating means for heat dissipation.

For this purpose, the motor cases (100, 200, 300) are made of a graphite substrate 110, and the graphite substrate 110 is dispersed on the matrix 111 and the matrix 111, Formed graphite-nano-metal composite 112 by injection molding.

In other words, the motor case (100, 200, 300) according to the present invention includes the graphite substrate 110 itself, which is a material of the case, with graphite having good heat dissipation property so that a separate heat dissipating structure for discharging heat generated during operation of the motor is unnecessary It can be realized with a simple design, and since the overall shape is formed by a simple design, it can be manufactured through injection molding.

For example, the motor case (100, 200, 300) according to the present invention may have a hollow shape having an open top and a bottom as shown in FIG. 1, and a pair of end caps (30) And as shown in FIG. 5, the lower portion may be hermetically closed and the upper portion may be opened, so that the opened upper portion is coupled through the end cap 30.

However, the shapes of the cases 100, 200 and 300 are not limited thereto, and they can be changed into various known shapes depending on the arrangement of the stator 10, the rotor 20, and various parts accommodated in the case 100, 200, . In other words, it can be seen that the motor case (100, 200, 300) according to the present invention can be realized in a variety of known shapes generally used in an electric motor if the shape is injection-moldable.

On the other hand, the matrix 111 for forming the graphite substrate 110 may be a polymer resin. The polymer resin may include at least one of a thermosetting resin and a thermoplastic resin.

The thermosetting resin may include at least one selected from the group consisting of an epoxy resin, a urethane resin, a melamine resin and a polyimide resin. The thermoplastic resin may be at least one selected from the group consisting of a polycarbonate resin, a polystyrene resin, a poly A polyolefin resin, a polyolefin resin, a polypropylene resin, a polyester resin, a polyacrylate resin, a polyester resin, a polyamide resin, a cellulosic resin, a polyolefin resin and a polypropylene resin And may include one or more species.

In the case where the graphite-nano metal composite body 112 forming the graphite substrate 110 together with the matrix 111 is a composite in which nano metal particles are bonded to the surface of the graphite, specific binding methods, The content can be selected and used regardless of the kind of the nano-metal particles.

However, preferably, the nano-metal particles may be a conductive metal so as to exhibit an electromagnetic wave shielding effect. The nano metal particles may include at least one selected from the group consisting of Ni, Si, Ti, Cr, Mn, Fe, Co, Cu, Sn, In, Pt, Au and Mg.

Meanwhile, the graphite-nano metal complex 112 included in the graphite substrate 110 may be manufactured by various methods.

As an example, graphite and nano-metal particles are mixed to prepare a graphite-nano-metal particle mixture. At this time, the mixing ratio of the nano metal particles and the platelet-shaped graphite can be arbitrarily set according to the purpose of use, but in the present invention, the nano metal particles are present at a high density on the platelet-shaped graphite surface, .

Then, plasma is applied to the mixture of graphite-nano-metal particles to vaporize the nano-metal particles. Subsequently, a quenching gas is injected into the vaporized nano-metal particles to condense or quench the vaporized nano-metal particles. Thus, the growth of the vaporized nano-metal particles is suppressed, and the nano-metal particles are crystallized on the graphite surface to form the graphite-nano-metal particle composite 112.

In the graphite-nano metal particle composite, the nano-metal particles may be contained in an amount of 20 to 50 wt% with respect to the graphite, and may be bonded to the graphite surface in a crystal form having an average particle size of 10 to 200 nm. Also, the graphite-nano metal particle composite may have a surface area ranging from 30 to 70% by area based on the cross section of the graphite-nano-metal particle composite.

Meanwhile, the graphite-nano metal particle composite 112 may include a poly-dopamine layer on the nano-metal particle. The polypodamine layer may be formed by dipping the graphite-nano-metal particle composite 112 into an aqueous solution of dopamine. At this time, when an aqueous solution of basic dopamine is used as the dopamine aqueous solution, dopamine reacts spontaneously under oxidizing conditions to polymerize on nano-metal particles of the graphite-nano metal particle composite 112 to form a poly-dopamine layer. Therefore, no separate baking process is required, and the addition of the oxidizing agent is not particularly limited, but oxygen gas in the air can be used as the oxidizing agent without adding the oxidizing agent.

Here, the thickness of the polydopamine layer is determined by the dipping time. Accordingly, when a dopamine aqueous solution prepared by dissolving dopamine such that the dopamine concentration is in the range of 0.1 to 5 mg / mL in a Tris buffer solution having a pH of 8 to 14, It is desirable to damp the nano metal-platelet graphite for 24 hours.

On the other hand, even if the graphite is simply dipped in a dopamine aqueous solution, a dopamine coating layer is not formed on the surface of the graphite. However, when the nanometer metal particles are bonded to the graphite surface, a dopamine coating layer is formed by the nanometer metal particles.

Accordingly, in the graphite-nano-metal particle composite 112 constituting the graphite substrate 110 according to the present invention, the nano-metal particles are bonded to the surface of graphite, so that the nano-metal particles form a poly-dopamine layer.

Such a polypodamine layer improves the interfacial property between the above-described matrix-forming component and the graphite-nano-metal composite, thereby enabling the formation of graphite substrate 110 in the form of a sheet even though it contains a small amount of matrix-forming component.

Accordingly, the content of the graphite-nano metal complex 112 can be increased in the graphite substrate 110. In addition, when the polydodamine layer is coated on the graphite-nano-metal composite 112, the dispersibility in the organic solvent is improved. Therefore, when the substrate-forming composition includes an organic solvent, the graphite- Can be uniformly dispersed.

On the other hand, the substrate-forming composition may further contain a leveling agent, a pH adjuster, an ion scavenger, a viscosity adjuster, a thixotropic agent, an antioxidant, a heat stabilizer, a light stabilizer, an ultraviolet absorber, a colorant, a dehydrating agent, Antiseptic agent, antiseptic agent, antiseptic agent, antiseptic agent, and the like may be added to the composition of the present invention. The various additives described above may be those known in the art and are not particularly limited in the present invention.

The forming component of the polypodamine layer may further comprise a solvent. It is possible to select a suitable solvent in accordance with the selected adhesive component. Therefore, the solvent is not particularly limited in the present invention. Any solvent which permits proper dissolution of each component may be used as the solvent. For example, One or more selected from the group consisting of an aqueous solvent, an alcohol solvent, a ketone solvent, an amine solvent, an amine solvent, an ester solvent, an amide solvent, a halogenated hydrocarbon solvent, an ether solvent and a furan solvent have.

The substrate-forming composition may be produced by injection molding into a graphite substrate 110. That is, when the graphite substrate 110 is manufactured through injection molding, it is possible to manufacture a simple shape, so that the simple cases 100, 200 and 300 can be manufactured without any additional process.

In addition, when the polypodamine layer is formed on the nano-metal particles constituting the graphite-nano-metal composite body 112, the graphite-nano metal complex 112 may be contained in the graphite body 110 in an amount of 50 to 80 wt% .

As described above, the motor case (100, 200, 300) according to the present invention can achieve excellent heat radiation property by using the graphite base material 110 containing 50 to 80% by weight of the graphite-nano metal composite material 112 as a material.

Meanwhile, the motor case (100, 200, 300) according to the present invention may include a protective coating layer 120 formed of a composition for forming a protective coating layer including a polymer resin on the outer surface.

3, the protective coating layer 120 is coated on the surface of the graphite substrate 110 to a predetermined thickness, so that the graphite substrate 110 is exposed to the outside It is possible to realize additional performance such as insulation and vibration resistance through the components included in the protective coating layer forming composition.

At this time, the thickness of the protective coating layer 120 may be 0.1 to 1000 탆 . This is because when the thickness of the protective coating layer is less than 0.1 탆, the graphite-nano-metal composite 112 contained in the graphite substrate 110 is more likely to be separated, and if the thickness of the protective coating layer 120 exceeds 1000 탆 This is because it has a disadvantage that thinning is difficult.

The protective coating layer forming composition may be any coating layer forming component known in the art.

For example, the protective coating layer-forming composition may include a polymer resin, and the polymer resin may include at least one of a thermosetting resin and a thermoplastic resin. The thermosetting resin may include at least one selected from the group consisting of an epoxy resin, a silicone resin, a urethane resin, a melamine resin phenol resin, and a polyimide resin. The thermoplastic resin may be a polycarbonate resin, a polystyrene resin A polyolefin resin, a polyolefin resin, a polypropylene resin, a polyester resin, a polyamide resin, a polyamide resin, a cellulosic resin, a polyolefin resin and a polypropylene resin And the like.

That is, the protective coating layer forming composition may include various polymer resins depending on the purpose of use. For example, silicone resin, epoxy resin, polyester resin or the like may be included in order to achieve insulation through the protective coating layer 120. In order to improve the vibration resistance, a phenol resin or an epoxy resin may be included And when it is desired to improve the heat radiation property, a carbon-based filler may be included in the epoxy resin.

However, when a carbon-based filler is added to the protective coating layer 120 to provide heat dissipation properties, excellent adhesion performance is exhibited between the graphite substrate 110 and the carbon-based filler and the protective coating layer forming component, compatibility with the carbon- The protective coating layer forming component may include an epoxy resin and the curing agent for curing the epoxy resin may be included in the protective coating layer forming component so that the heat radiation performance can be improved at the same time. The epoxy resin may be an epoxy resin known in the art and is not particularly limited in its specific kind, and may be selected depending on the purpose.

Examples of the epoxy resin include epoxy resins such as glycidyl ether type epoxy resins, glycidyl amine type epoxy resins, glycidyl ester type epoxy resins, linear aliphatic epoxy resins, cyclo aliphatic epoxy resins, Containing epoxy resin, a substituted epoxy resin, a naphthalene-based epoxy resin, and derivatives thereof.

The curing agent contained in the protective coating layer forming component together with the epoxy resin may be varied depending on the specific type of the epoxy resin selected. Specific examples of the curing agent include those known in the art, A polyhydric hydroxy compound, an aliphatic amine, an aromatic amine, an acid anhydride system, and a latent curing agent.

Among the curing agents for epoxy resins, latent curing agents such as heat curing type curing agents which are liquid at room temperature, and dicyandiamide which is polyfunctional and can be added in small quantities equally can be used as the curing agent.

The protective coating layer forming component may further include a curing accelerator in addition to the epoxy resin and the curing agent. The curing accelerator serves to adjust the curing rate and physical properties of the cured product, and a known curing accelerator may be selected and used according to the type of the curing agent selected. Examples of the curing accelerator include amines, Organic phosphines, and Lewis acid curing accelerators. When the amine-based curing agent is used, for example, a curing accelerator such as an imidazole-based curing accelerator may be used in combination. In this case, the amount of the amine-based curing agent to be added is preferably equal to or less than the theoretical required amount for the epoxy group , But the present invention is not limited to this use.

In addition, the protective coating layer-forming component may further contain at least one of a leveling agent, a pH adjusting agent, an ion trap agent, a viscosity adjusting agent, a thixotropic agent, an antioxidant, a heat stabilizer, a light stabilizer, an ultraviolet absorbent, a colorant, One or more kinds of additives such as an antistatic agent, antifungal agent, antiseptic agent and the like may be added. The various additives described above may be those known in the art and are not particularly limited in the present invention.

In addition, the protective coating layer forming component may further include a solvent. Here, the solvent may be selected according to the selected adhesive component. As the solvent, any solvent capable of appropriately dissolving each component may be used. For example, an aqueous solvent such as water, an alcohol At least one selected from the group consisting of an organic solvent, a ketone solvent, an amine solvent, an amine solvent, an ester solvent, an amide solvent, a halogenated hydrocarbon solvent, an ether solvent and a furan solvent can be used.

When a carbon-based filler is included in the protective coating layer forming component to smoothly discharge the heat radiated from the graphite substrate 110 through the protective coating layer 120 by adding heat to the protective coating layer 120, The carbon-based filler can be used without limitations when it contains carbon in its material, and a carbon-based material known in the art can be used.

In the case of the carbon-based filler, since carbon is contained in the same manner as the graphite substrate, the interface characteristics of the graphite substrate and the protective coating layer can be improved. In addition, the shape and size of the carbon-based filler are not limited, and they may be porous or non-porous in structure, and may be selected depending on the purpose. However, the carbon-based filler may preferably be one or more of single wall carbon nanotubes, double wall carbon nanotubes, multiwall carbon nanotubes, graphene, graphen oxide, graphene nanoplate, graphite, carbon black And carbon-metal composites. More preferably, carbon black may be contained as a main component of the carbon-based filler.

In addition, the protective coating layer 120 may include a physical property-enhancing component in the composition for forming a protective coating layer.

The physical property enhancing component is intended to improve durability by exhibiting further improved heat dissipation and excellent adhesion when the composition for forming a protective coating layer is coated on the graphite substrate 110.

When such a physical property enhancing component is used together with the carbon black among the epoxy resin and the carbon filler among the protective coating layer forming components described above, a synergistic effect of the desired physical properties is brought about and remarkable durability and heat dissipation are exhibited, And it is possible to improve the physical properties without achieving any method of achieving excellent heat dissipation and adhesiveness even in a molded article made of an organic compound such as a nonmetal or a plastic other than a metal in a graphite substrate having a very simple shape and a small surface area .

For example, the property enhancing component may include a silane-based compound. The silane-based compound may be used without limitation in the art as a silane coupling agent, and examples thereof include an aminosilane coupling agent, an epoxy silane coupling agent, a ureido silane coupling agent, an isocyanate silane A silane coupling agent, a coupling agent, a vinyl silane coupling agent, an acryl silane coupling agent, and a ketimine silane coupling agent. These silane coupling agents may be used singly or in combination of two or more. The silane-based compound may further include a titanium coupling agent, an aluminum coupling agent, and the like.

In addition, the physical property improving component may further include a dispersant in the silane compound. The dispersant may be any of those known in the art. The dispersant may be at least one selected from the group consisting of polyester dispersant, polyphenylene ether dispersant, polyolefin dispersant, acrylonitrile-butadiene-styrene copolymer dispersant, polyarylate dispersant, polyamide dispersant, polyamideimide dispersant, A sulfonic dispersant, a polyetherimide-based dispersant, a polyether sulfone-based dispersant, a polyphenylene sulfide-based dispersant, and a polyimide-based dispersant; Based dispersants, polyether ketone-based dispersants, polybenzoxazole-based dispersants, polyoxadiazole-based dispersants, polybenzothiazole-based dispersants, polybenzimidazole-based dispersants, polypyridine-based dispersants, polytriazole- Based dispersant, a polysulfone-based dispersant, a polyurea-based dispersant, a polyurethane-based dispersant, or a polyphosphazene-based dispersant, and any one of them may be used alone, or a mixture or copolymer of two or more selected from these may be used It is possible.

Further, the physical property-enhancing component may further include a dispersion stabilizer, and the dispersion stabilizer may be any of those well-known in the art. Thus, the present invention is not limited to the specific kind, and examples thereof include anionic A surfactant, a cationic surfactant, a nonionic surfactant, a wetting agent or a wettability improver may be used.

That is, the protective coating layer 120 according to the present invention can be used without limitation as long as the protective coating layer-forming composition is added to the surface of the graphite substrate 110. As a non-limiting example, Forming composition described above by a method such as blade coating, flow coating, casting, printing method, transfer method, brushing, dipping or spraying, It can be coated on the surface of the graphite substrate. At this time, the viscosity of the protective coating layer forming composition may be 1 to 100,000 cps .

Meanwhile, the motor case 100 according to the present invention may include a reinforcing support body 130 made of a metal material so as to reinforce the strength of the graphite substrate 110. The reinforcing supporter 130 is integrally formed with the graphite base 110 by being embedded in the graphite base 110 through insert molding.

That is, since the graphite substrate 110, which is the material of the motor case 100, 200, or 300 according to the present invention, is made of the polymer resin and the graphite-nano metal composite body 112, .

To solve this problem, in the present invention, a reinforcing supporter 130 made of a metal material having rigidity may be embedded in the graphite substrate 110.

Accordingly, resistance to an external impact is enhanced through the reinforcing support body 130, and strength is reinforced, thereby preventing the graphite substrate 110 from being easily broken by brittleness.

The reinforcing supporter 130 may be made of any one of Al, Ni, Si, Ti, Cr, Mn, Fe, Co, Cu, Sn, In, Pt, and Au so as to enhance the strength against external impact, , Mg, and the like.

Preferably, it may be made of Al or Mg material considering the material cost. However, the present invention is not limited thereto, and it can be made of various known metal materials.

The reinforcing supporter 130 may be formed of a plurality of wires spaced apart from each other, a bar type, and a plate having a predetermined width, and may be arranged so as to be parallel to each other or to intersect with each other.

In addition, the reinforcing support body 130 may be configured to include a closed frame-like frame member 131 and a connection member 132 having both ends connected to the frame member 131.

That is, as shown in FIG. 4, the reinforcing supporter 130 may have a plurality of connecting members 132 arranged inside a substantially rectangular frame member 131 in a lattice structure or a honeycomb structure (FIGS. 4A and 4B) 4b), a plurality of connecting members 132 may be spaced apart from each other in parallel to each other (see FIG. 4c), and a substantially rhombic connecting member 132 formed in a curved shape on one side Or may be in an interconnected form (see Figure 4d).

However, the shape of the reinforcing supporter 130 is not limited thereto, and the connecting member 132 may have various shapes such as a lattice shape, a honeycomb shape, a straight shape, a curved shape, a circular shape, a polygonal shape, And it is also possible to configure only the connecting member 132 without the frame member 131.

In addition, when the motor case 100 according to the present invention includes a curved surface, the frame member 131 and the connecting member 132 may be formed in a curved shape corresponding to the curved surface of the case 100.

The reinforcing supporter 130 may be disposed entirely within the graphite base 110 constituting the motor case 100, 200 or 300, may be partially disposed, may be provided as a single cylinder, Or spaced apart from one another.

Meanwhile, at least one fastening hole 140 may be provided at various positions in the motor case 100 according to the present invention in order to improve the fastening property with other parts, for example, the end cap 30.

The fastening hole 140 may be recessed at a predetermined depth from one surface of the graphite substrate 110 or may be formed through the post hole.

Accordingly, the motor case 100 according to the present invention has a stator 10 and a rotor 20, which are implemented in a predetermined shape and then are required to be firmly fastened to other parts or disposed inside the case 100, A known fastening member 40 such as a screw member or a pin member is inserted into the fastening hole 140 when the end cap 30 is to be assembled to prevent external exposure of the end cap 30 As shown in FIG.

At this time, the fastening hole 140 minimizes the damage of the graphite base 110 and prevents the graphite base 110 from being damaged from the load concentrated at the fastening part when fastened through the fastening member 40 The reinforcing supporter 130 is formed to be directly above the reinforcing supporter 130.

That is, the fastening hole 140 is formed to penetrate through the reinforcing support body 130 embedded in the graphite base 110 from one side or side of the graphite base 110, As shown in Fig.

Accordingly, even if a load is generated on the side of the fastening member 40 in order to maintain the engaged state in a state of being coupled with other parts through the fastening member 40, the load is transmitted to the reinforcing support 40 via the fastening member 40, (130) side, thereby increasing the fastening force and preventing the graphite substrate (110) itself from being damaged by the load.

In addition, since the area of the graphite base 110 itself is minimized in order to form the fastening hole 140, the risk of damage to the graphite base 110 itself during machining can be reduced.

As a result, the motor case 100 according to the present invention can overcome the limitations of the conventional injection molding which is likely to be broken by the load concentrated during assembly with other components through the fastening member 40 Assembling in various shapes becomes possible.

Here, the fastening holes 140 may be formed at various positions and appropriate numbers of the motor case 100, and are positioned directly above the reinforcing supporting body 130, 130) of the present invention.

Meanwhile, the motor case (100, 200, 300) according to the present invention can be applied to an electric motor used in an automobile, an electric bicycle, a scooter and the like. At this time, the electric motor may be a DC motor, an AC motor, a brush type electric motor, or a BLDC motor. In addition, the electric motor may be an external type motor and an internal type motor, or may be a traction motor. However, the present invention is not limited to the electric motor of the above-described kind, and may be applied to all of the motors (100, 200, 300) according to the present invention, It is possible to apply to a kind of motor. In addition, it can be applied to motors used in household appliances or production facilities.

In addition, the end cap 30 coupled with the motor case 100, 200, 300 may also be formed through injection molding using a graphite substrate 110 including a graphite-nano metal complex. In the graphite substrate 110, It is noted that a reinforcing support body 130 may be buried through insert molding.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100, 200, 300: Motor case
110: graphite substrate 111: matrix
112: graphite-nano metal complex 120: protective coating layer
130: reinforcing support body 131: frame member
132: connecting member 140: fastening hole

Claims (14)

A motor case for housing a stator and a rotor therein,
In this case,
A graphite substrate comprising a matrix and a graphite-nano metal composite dispersed on the matrix and having nanometer-metal particles bonded to the surface of the graphite through injection molding. The method according to claim 1,
Wherein the nano metal particles are crystallized nanoparticles. The method according to claim 1,
Wherein the graphite-nano metal composite further comprises a poly-dopamine layer coated on the nano-metal particles. The method of claim 3,
Wherein the graphite-nano-metal composite is contained in the graphite base in an amount of 50 to 80 wt%. The method according to claim 1,
Wherein the case has a protective coating layer on its outer surface,
Wherein the protective coating layer comprises a protective coating layer-forming composition comprising a polymer resin. 6. The method of claim 5,
Wherein the polymer resin is selected from the group consisting of epoxy, polyethylene, polypropylene, polystyrene, polyvinyl chloride, nylon, silicone, polyester, phenol, polyester, polyimide, A motor case comprising a plurality of or more resins. 6. The method of claim 5,
Wherein the composition for forming a protective coating layer comprises an epoxy resin and a carbon-based filler to improve heat dissipation to the outside. 8. The method of claim 7,
Wherein the carbon-based filler is selected from the group consisting of a single-walled carbon nanotube, a double-walled carbon nanotube, a multi-walled carbon nanotube, a graphene, a graphene oxide, a graphene nanoplate, a graphite, A motor case containing more than one kind. The method according to claim 1,
In this case,
And a reinforcing supporter made of a metal material and embedded in the graphite substrate,
Wherein the graphite base and the reinforcing supporter are integrally formed through an insert molding. 10. The method of claim 9,
Wherein the reinforcing supporter includes one of magnesium and aluminum. 10. The method of claim 9,
Wherein the reinforcing supporter includes a rim member and a connecting member whose both ends are connected to the rim member. 12. The method of claim 11,
Wherein the connecting member has a lattice shape, a honeycomb shape, a straight shape, a curved shape, and a shape in which they are mutually combined. 10. The method of claim 9,
Wherein the graphite base is provided with at least one fastening hole for fastening with other parts, and the fastening hole is formed to be positioned directly above the reinforcing support. At least one stator comprising a coil wound on the core;
A rotor disposed inside the stator;
The case according to any one of claims 1 to 13, having a housing space for accommodating the stator and the rotor. And
And an end cap coupled to an open end of the case.

Images