JP2016065294A - Motor rotor support body and production method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve weight reduction and resistance increase of a motor rotor support body for holding a magnetic substance, for achieving weight reduction and improvement of efficiency.SOLUTION: A motor rotor support body 100 for supporting magnetic substances (permanent magnets 30, 31) disposed on a rotor of a motor, is configured so that, plural support main bodies 1 formed of non-magnetic steel whose relative magnetic permeability is less than 1.005, and whose 0.2% resistance at room temperature is equal to or more than 650 MPa, and a resin material 10 interposed between at least two support main bodies 1, 1, are laminated, and preferably, support holes 2 to which the magnetic substances are fitted and support the peripheral edges of the magnetic substances, are provided on the support main bodies 1. The resin material 10 has penetration parts 11 which the magnetic substances penetrate and are a non-contact state to at least the outer peripheral edge of the magnetic substances, so that weight reduction and resistance increase can be achieved without damaging non-magnetic property.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a support that is used in a rotor of a motor and supports a magnetic body disposed on the rotor.

Normally, rare earth magnets added with rare earth (rare earth) such as neodymium and dysprosium are used for motor magnets to exhibit high performance.
Patent Document 1 discloses an axial motor having a rotor provided with a plurality of permanent magnets having magnetic poles in a direction parallel to the rotation axis.
Patent Document 2 proposes a high-performance axial gap motor having a ferrite magnet instead of a rare earth magnet.

These axial type motors or axial gap motors have a rotor on which magnets are arranged, and the magnets are supported by a support included in the rotor. For this support, nonmagnetic steel made of austenitic stainless steel is generally used.
The support is included in a rotor that rotates at a high speed, and it is necessary to support the magnet and properly maintain its position. For this reason, the support is required to have not only non-magnetic properties but also appropriate strength.
By the way, although austenitic stainless steel increases in strength by cold working, there is a problem that non-magnetic properties are impaired by work-induced transformation. For this reason, the process of obtaining a support body shape by machining from the raw material after hot forging is usually employed.
Furthermore, there is a demand for speeding up and weight reduction in motors, and there are increasing demands for strength, reduction of materials used, and weight reduction for the support. The support is also required to be lighter from the viewpoint of reducing the inertial force generated during rotation and improving the motor performance.

International Publication No. 2011/046108 JP 2011-010375 A

  However, as described above, with conventional materials, there is a trade-off between non-magnetic properties and increased strength, and it is not possible to increase the strength while maintaining the non-magnetic properties and reduce the materials used. The above request cannot be met. Further, with the conventional material, if the thickness is increased in order to ensure the strength, the weight cannot be realized.

  Moreover, in the conventional manufacturing process, it is also possible to give a complicated product shape to steel in order to obtain rigidity. However, in order to obtain such a complicated shape, machining by hot cutting or machine cutting or wire cutting is required, which increases the work time burden. For example, depending on the shape and size of the product, there are cases where processing takes as long as two weeks. Therefore, when mass production is considered, the above-described work burden becomes a very big problem. Even if it is going to avoid this, since there are restrictions on the manufacturing process as described above, an alternative method considering productivity cannot be adopted.

  Furthermore, it is desired that the support has a high electric resistance. This is because, when the motor is operated, if electricity flows through the support by electromagnetic induction, the motor is heated and the efficiency of the motor is lowered. However, in a situation where steel is used and the manufacturing method is limited, it is difficult to greatly improve the electrical resistance.

  The present invention has been made against the background of the above circumstances, and it is an object of the present invention to provide a motor rotor support that can be reduced in weight and increased in electrical resistance without impairing nonmagnetic characteristics, and a method for manufacturing the same. In addition, by using a resin material in addition to non-magnetic steel, the weight can be reduced and the electrical resistance of the entire support body can be improved, thereby making it possible to simultaneously realize the weight reduction and high performance of the motor.

  That is, the first form of the motor rotor support of the present invention is a support for supporting a magnetic body disposed on the rotor of the motor, and has a relative permeability of less than 1.005 and a value of 0.1 at room temperature. A plurality of support bodies made of non-magnetic steel having a 2% proof stress of 650 MPa or more and at least two resin bodies interposed between the support bodies are laminated.

  In the present invention, when non-magnetic steel is used for the support body, and the support body is configured as a support body, the support body has a relative permeability of less than 1.005 and 0 at room temperature (for example, 5 ° C. to 35 ° C.). .2% proof stress is 650 MPa or more. When the relative permeability is less than 1.005, the support can support the magnetic body without affecting the magnetism. In addition, since the 0.2% proof stress at room temperature is 650 MPa or more, the magnetic material can be reliably supported even when the material is thinly rotated and rotated at a high speed. Note that the 0.2% proof stress of the support body is preferably 700 MPa or more.

  In addition, the resin material should just be interposed between at least two support body main bodies, and a support body may have more support body bodies. In that case, a resin material may be interposed between the support bodies, or a structure in which a support body that does not interpose a resin material is laminated may be included. By laminating single support bodies, the rigidity of the support can be increased using a single material manufactured at a sufficient processing rate.

The resin material is usually a resin material having a relative permeability of usually 1.0, a specific gravity of usually about 0.8 to 1.8, and is lighter than steel, so that the nonmagnetic properties are not impaired. The weight of the support can be reduced. The electrical resistance of non-magnetic steel is about 6~9 × 10- ⁵ Ωcm, the insulating resin material, the electric resistance of more than 10 ⁹ [Omega] cm, it is possible to increase the electrical resistance of the entire support . In the present invention, the relative magnetic permeability and specific gravity of the resin, the electric resistance of the nonmagnetic steel, and the resin material are not limited to the above description.

  According to another aspect of the present invention, there is provided a motor rotor support body according to the present invention, wherein the magnetic body is fitted into the support body to support the periphery of the magnetic body. The magnetic body has a penetrating portion that penetrates and is not in contact with at least the outer periphery of the magnetic body.

If the support is made too thin using high-strength nonmagnetic steel, there is a concern that fixing of the magnet becomes difficult or the axial rigidity of the support is reduced. Non-magnetic steel is used to hold the magnets, and resin is used for the parts that are not held, so that the magnets can be fixed, the rigidity in the axial direction can be secured, the rotors can be made lighter, and the electric resistance can be further improved. Everything can be realized.
In the said form, a magnetic body is supported by the support part of a support body main body with high intensity | strength.
The support of the magnetic body by the support portion does not need to be performed over the entire circumference of the outer periphery of the magnetic body, but so that the magnetic body is securely held with respect to the support body. It is desirable that the support is performed at at least a plurality of locations on the periphery of the magnetic body. As a support part, a support hole is mentioned, for example. The support hole only needs to have a part or all of the hole shape into which the magnetic body is fitted as described above. The support holes may be arranged so as to face each other between the support bodies with the resin material interposed therebetween, and may not have a shape through which the magnetic body penetrates in the other direction side. That is, on the multidirectional side, a through hole smaller than the magnetic body may be formed or closed. The support of the magnetic material by the support portion may be performed by maintaining the shape of the support portion, or a fixing means such as adhesion may be used. Note that the support portion is not limited to the support hole as described above, and can hold the magnetic body by an appropriate method.

  Further, the penetrating portion provided in the resin material has a shape through which the magnetic material penetrates and at least does not contact the outer periphery of the magnetic material, so that the centrifugal stress of the magnetic material is not applied to the resin material when the support rotates. The load on the resin material having a relatively low strength relative to the nonmagnetic steel is reduced to prevent the resin material from being deformed or damaged. Since the outer periphery of the magnetic body and the resin material are not in contact with each other, there may be a gap between the outer periphery of the magnetic body and the resin material, and the resin material is open outside the outer periphery of the magnetic body. May be. Moreover, it is desirable that the penetrating portion has a shape that does not contact the entire periphery of the magnetic body. Thereby, the load from a magnetic body is not added to the resin material in any direction.

  The motor rotor support according to another aspect of the present invention is the motor rotor support according to the present invention, wherein the nonmagnetic steel is in mass%, C: 0.07% or less, Si: 0.1-2.0%, Mn: 10-25%, Cr: 12-25%, N: 0.25-0.8%, Al: 0.005-0.02%, Ni: 5.0% or less, Mo + 1 / 2W: 3.0% Hereinafter, V, Nb: 0.1% or less, Co: 3% or less, and B: 0.01% or less are contained, and the balance has a composition composed of Fe and inevitable impurities.

  The present invention is not limited to a specific type of nonmagnetic steel, but 18Mn-18Cr material can be preferably used. The reason why the action and composition of each component of the preferred composition is determined for the 18Mn-18Cr nonmagnetic steel will be described below. Regarding chemical composition, “%” means “mass%”.

Si: 0.1 to 2.0%
Since Si is used as a deoxidizing material, 0.1% or more is necessary. However, since Si is a ferrite phase forming element, if it is excessively contained, the ferrite phase is precipitated and the cold workability is also deteriorated, so the upper limit is made 2.0%.

Mn: 10-25%
Mn is an austenite phase forming element, and 10% or more is required to increase the N solubility. However, since an intensity | strength will fall when it contains excessively, an upper limit shall be 25%. For the same reason, it is desirable to set the lower limit to 13% and the upper limit to 24%, and it is more desirable to set the lower limit to 16% and the upper limit to 21%.

Cr: 12-25%
Cr needs to be 12% or more to ensure N solubility. However, since Cr is a ferrite forming element, if it is excessively contained, the ferrite phase precipitates, so the upper limit is made 25%. For the same reason, it is desirable to set the lower limit to 14% and the upper limit to 23%, and it is more desirable to set the lower limit to 16% and the upper limit to 21%.

N: 0.25 to 0.8%
N needs to be 0.25% or more in order to secure the strength, but if it is contained excessively, it will cause blowhole generation, so the upper limit is made 0.8%.

Al: 0.005 to 0.02%
Al can be added as a deoxidizing material, but if it is contained in excess, nitrides are formed and toughness is lowered, so the upper limit is made 0.02% and it is contained as desired. In addition, in order to fully obtain the effect | action as a deoxidizer, it is desirable to contain 0.005% or more.

Ni: 5.0% or less Ni is an austenite phase forming element and is contained as desired. However, if it exceeds 5.0%, the strength decreases, so the upper limit is made 5.0%. In addition, when the content is positive, the content is desirably 1.0% or more, and more desirably 1.5% or more. In addition, it may be less than 1.0% as an inevitable impurity.

Mo + 1 / 2W: 3.0% or less W and Mo are components for improving strength, and are contained as desired. However, if it is excessively added, the cold workability is deteriorated. Therefore, if desired, each can be contained alone or in combination in a range of 3.0% or less in terms of Mo + 1 / 2W. In addition, when it contains either, in order to acquire the effect | action fully, it is desirable to set it as 1.0% or more in Mo + 1 / 2W.

V and Nb: each 0.1% or less V and Nb combine with nitrogen to form a nitride and prevent coarsening of crystal grains during heat treatment, so are contained as desired. However, since it is a ferrite phase forming element, if it is excessively contained, the ferrite phase is precipitated. Furthermore, when it adds excessively, the fall of ductility will be caused. Therefore, it can contain in 0.1% or less of range, respectively. In addition, when it contains, in order to fully obtain the effect | action, it is desirable to contain 0.01% or more respectively.

Co: 3% or less Co is an austenite phase-forming element and is contained as desired. However, since it is an expensive component, it can contain 3.00% at the upper limit. In addition, when it contains, in order to acquire the effect | action fully, it is desirable to contain each 0.5% or more.

B: 0.01% or less B is solid solution strengthened and can be expected to be strengthened by fine nitrides, and improves strength and toughness. However, if it is contained excessively, it becomes coarse nitrides and causes toughness to decrease. Therefore, it can contain in 0.01% or less of range. In addition, when it contains, in order to acquire the effect | action fully, it is desirable to contain 0.003% or more respectively.

C: 0.07% or less C contributes to strength improvement together with N, but its upper limit is set to 0.07% by mass in order to deteriorate the corrosion resistance.

Inevitable impurities P and S: each 0.03% or less P and S affect ductility and hot workability. Therefore, P and S are each preferably 0.03% or less.

  The motor rotor support according to another aspect of the present invention is characterized in that, in the present invention, the support body is made of a cold-worked material of the nonmagnetic steel.

  A cold-worked material that has undergone cold working can be used for the support body, and further strengthening can be achieved by strengthening the work by cold working.

  The motor rotor support according to another aspect of the present invention is characterized in that, in the present invention, the resin material includes a resin and a reinforcing material.

The resin material can be formed by molding by adding glass fibers, nylon, vinylon, organic fibers such as aramid fibers and vinylon fibers as a reinforcing material. Moreover, although carbon fiber can be used as a reinforcing material, it is not preferable in terms of insulation.
Moreover, it does not specifically limit as a resin raw material, An unsaturated polyester resin, an epoxy resin, a phenol resin etc. can be used. The resin may be either a thermoplastic resin or a thermosetting resin.
Further, the resin material may contain an auxiliary material such as a curing agent and a curing accelerator together with the reinforcing material.

  The motor rotor support according to another aspect of the present invention is characterized in that, in the present invention, the resin material exhibits a deflection temperature under load of 100 ° C. or more with respect to a bending stress of 1.8 MPa.

There is a high possibility that the motor will be placed around a device where the temperature rises, such as an engine or a disc brake. Further, in the operation of the motor, the temperature of the support is increased by the operation heat of the motor or electromagnetic induction. In that case, the resin material to be used needs to retain its shape even at 100 ° C. or higher so that it can withstand the assumed use environment. As a reference for determining whether strength and rigidity of 100 ° C. or higher are ensured, there is a deflection temperature under load defined by JIS K7191 or the like. It is determined that a resin having a deflection temperature of 100 ° C. or higher when a load of 1.8 MPa is applied can be used as a suitable one.
Examples of the resin having a deflection temperature under 100 ° C. include PPS (polyphenylene sulfide) resin, PEEK (polyether ether ketone) resin, PPSU (polyphenylsulfone) resin, PBT (polybutylene terephthalate) resin, 66 nylon, PC There are resins. There are PPS glass fiber reinforced resin reinforced with glass fiber, PEEK glass fiber reinforced resin, PBT glass fiber reinforced resin, 66 nylon glass fiber reinforced resin, 6 nylon glass fiber reinforced resin, and the like. The above resin is an example and is not limited thereto.

  A motor rotor support according to another aspect of the present invention is characterized in that, in the present invention, the resin material is an injection-molded body.

  High-strength nonmagnetic steel can be thinned because of high strength, but if thinned, rigidity in the direction along the axial direction of the support may be insufficient. In that case, the resin material can take a role of ensuring the rigidity of the entire support by making the resin material have an appropriate complicated structure. Regarding the shape of the resin material, a structure in which a large number of beams are arranged along the radial direction between the support bodies is considered effective in order to ensure axial rigidity. For example, it is set as the structure which has a beam in part or all between the magnetic bodies arrange | positioned. The beam is preferably continuous with a ring-shaped portion of the resin material provided along the circumferential direction on the inner circumference side and / or outer circumference side of the magnetic body. However, the shape of the resin material is not particularly limited as long as it is a shape that can ensure rigidity. The resin material can be easily formed into various shapes by using an injection molded body. However, the molding method is not limited to this.

The motor rotor support according to another aspect of the present invention is characterized in that, in the present invention, the magnetic body is at least one of a rare earth magnet and a non-rare earth magnet.
The motor rotor support according to another aspect of the present invention is characterized in that, in the present invention, the non-rare earth magnet includes a ferrite magnet.
A motor rotor support according to another aspect of the present invention is characterized in that, in the present invention, the magnetic body includes a dust core.

  The type of magnetic material supported by the present invention is not particularly limited as the present invention, and may be either a rare earth magnet or a non-rare earth magnet. As the non-rare earth magnet, a ferrite magnet or the like can be used, and a dust core or the like can also be used.

  The motor rotor support according to another aspect of the present invention is the motor rotor support according to the present invention, wherein the support body and the resin material are laminated and fixed by at least one of caulking, screwing, welding, adhesion, and outer periphery shrink fitting by a ring material. It is characterized by being.

  The support body and the resin material can be laminated and fixed in various directions. In the present invention, the fixing method is not particularly limited.

  The motor rotor support according to another aspect of the present invention is the motor rotor support according to the present invention, wherein the resin material is interposed between the support bodies on the outer peripheral side of a bearing portion to which a rotation shaft for rotating the support is attached. It is characterized by.

  The resin material is interposed between the support bodies, but may be interposed only in a partial space between the support bodies. A plurality of magnetic bodies are usually arranged at intervals along the circumferential direction on the outer peripheral side of the support. In particular, rigidity is required for the support around the magnetic body. In addition, some of the supports have a bearing portion because the rotating shaft is fixed and rotates, and the resin material can be arranged at least on the outer peripheral side of the bearing portion. Further, a resin material may be positioned around the magnetic body.

The motor rotor support according to another aspect of the present invention has a bearing portion to which a rotating shaft for rotating the support is attached between the support bodies in which the resin material is interposed in the present invention. It is characterized by.
According to another aspect of the present invention, there is provided a motor rotor support body according to the present invention, wherein the bearing portion is not required to have nonmagnetic characteristics, and is made of general steel, an aluminum alloy, or a magnesium alloy. It is fixed to at least one of the main body and the resin material.

  As the material of the bearing portion, a non-magnetic characteristic is not particularly required, so that a general material can be used. Moreover, you may make it use a nonmagnetic material and the material which has insulation as a raw material of a bearing part.

  According to another aspect of the present invention, there is provided a motor rotor support body according to the present invention, wherein at least one of the support bodies in which the resin material is interposed is partly or entirely on the resin material side. And a bent portion located outside the outer peripheral surface of the resin material.

The bent portion is located on the outer peripheral side of the resin material and prevents the damaged material from scattering into the motor or the like when the resin material is damaged. It also has a function of protecting the resin material.
The bent portion may be provided on one side of the support body in which the resin material is interposed, or may be provided on both sides.

  A method of manufacturing a motor rotor support according to one aspect of the present invention includes a plurality of supports in which nonmagnetic steel is cold worked to have a relative permeability of less than 1.005 and a 0.2% proof stress at room temperature of 650 MPa or more. A body body is prepared, and a resin material is interposed between at least two of the support body bodies to be laminated and fixed to each other.

  The motor rotor support of the present invention is not limited to a special manufacturing process, and a cold-worked material that has been hot-worked is machined to produce a steel plate, which is laminated with a resin material. The motor rotor support body can be configured by binding together.

  The method for manufacturing a motor rotor support according to another aspect of the present invention is characterized in that, in the present invention, the cold working rate of the cold working is 10 to 40%.

  Cold working can be performed at a working rate of 10 to 40%. If the processing rate is low, sufficient work strengthening cannot be obtained, and if the processing rate is high, sufficient ductility cannot be obtained.

  In the method of manufacturing a motor rotor support according to another aspect of the present invention, in the present invention, after the cold working, the nonmagnetic steel is annealed at 300 to 600 ° C. for 0.5 hours or more. It is characterized by.

  After cold working, an annealing treatment at 300 to 600 ° C. for 0.5 hours or more can be performed in order to stabilize the shape.

  The method of manufacturing a motor rotor support according to another aspect of the present invention is characterized in that, in the present invention, the support body is subjected to machining with respect to a rough material that becomes the support body.

  One or more machining processes such as cutting, cold punching, cutting, laser machining, water jet machining, electric discharge machining, deep drawing and welding can be performed on the rough shaped material.

  As described above, according to the present invention, the magnetic body is supported by steel that can be increased in strength while maintaining non-magnetic characteristics, and the use of a resin material reduces the weight of the motor and increases the electrical resistance. Thus, there is an effect that the motor efficiency can be further improved due to the weight reduction of the motor and the high electrical resistance of the material.

It is the top view (A) of the support body in one Embodiment of this invention, and the II sectional view taken on the line I of FIG. Similarly, it is a sectional view (B) taken along line II-II in FIG. Similarly, it is the top view (A) and longitudinal cross-sectional view (B) of a bearing part. Similarly, it is a top view of the support body main body in which the magnetic body was inserted. Similarly, it is a top view of the resin material in which the magnetic body was engage | inserted. Similarly, it is sectional drawing of the motor rotor support body united. Similarly, it is a flowchart which shows the manufacturing process of a motor rotor support body. It is the top view (A) of the support body in other embodiment of this invention, and the IV-IV sectional view (B) of A figure. Similarly, it is a top view (A) of a resin material, and a VV line sectional view (B) of A figure. Similarly, it is the top view (A) of the motor rotor support body combined, and the VI-VI sectional view (B) of A figure. It is sectional drawing in other embodiment of this invention. It is the top view (A) of the support body of the outermost layer in other embodiment of this invention, and the VII-VII sectional view (B) of A figure. Similarly, it is the top view (A) of the support body main body of a center layer, and the VIII-VIII line sectional drawing (B) of A figure. Similarly, it is the top view (A) of a resin material, and the IX-IX sectional view (B) of A figure. Similarly, it is sectional drawing of the motor rotor support body united. Similarly, it is the top view (A) in the example of a change of a support body, and the XX sectional drawing (B) of A figure.

Hereinafter, an embodiment of the present invention will be described.
In this embodiment, a support body and a resin material are prepared.

Manufacturing process of support body The manufacturing process of the support body will be described with reference to the flowchart of FIG.
As a material for obtaining the support body, 18Mn-18Cr nonmagnetic steel is preferably selected, and as shown in FIG. 7, it can be obtained through ordinary melting, solidification processes and continuous casting. Specifically, secondary refining methods such as ladle refining method, bottom pouring method, top pouring method, vacuum casting method, electroslag remelting method and the like are exemplified.
As hot working to obtain a steel plate, hot forging such as hot rolling and hot stamping forging can be given as representative examples, and these can be performed by a conventional method. 800-1200 degreeC is illustrated as the hot processing temperature. As a method of obtaining a steel sheet by hot working, there is a method of hot stamping a billet material or a steel piece produced by continuous casting. The hot stamping is not particularly limited, but the hot stamping can be performed by hot stamping once or a plurality of times. In addition, one type or several types of molds may be used for stamping. The stamping temperature for hot stamping is equivalent to the aforementioned hot working temperature. It can be processed into the shape of a material by hot stamping such as hot stamping forging. In the case of the shape of the raw material, it can be made into a product shape by finishing. For example, a product can be manufactured efficiently by hot stamping and forging a billet obtained by continuous casting.

  The hot-worked material before obtaining the steel plate or the hot-worked material before cold working may be subjected to a solution treatment. The solution treatment conditions are not particularly limited, but 1000 ° C. or higher, the holding time is 5 minutes or longer, and the cooling method is exemplified by air cooling including water cooling, oil cooling, and fan cooling. The components are homogenized by the solution treatment and austenite is stabilized. In the present invention, the solution treatment can be omitted.

  The hot-worked material can be further cold worked. Examples of cold working include cold rolling and cold forging, and can be performed by a conventional method. By strengthening the work by cold working, it is possible to further increase the strength of the support body. In addition, cold work here means the process in the temperature range which does not exceed the recrystallization temperature of nonmagnetic steel, for example, you may heat as needed in the range of 450 degrees C or less. Processing in the temperature range exceeding the recrystallization temperature is assumed to be hot processing.

The cold working is desirably performed at a working rate of 10 to 40%. If the processing rate is low, sufficient work strengthening cannot be obtained, and if the processing rate is high, sufficient ductility cannot be obtained.
In cold rolling, the final plate thickness is exemplified by 1 to 4 mm. If the plate thickness is too thin, sufficient rigidity cannot be obtained, and if the plate thickness is too thick, it is difficult to reduce the weight. However, in this embodiment, the thickness of the support body is not particularly limited. In order to stabilize the shape after cold working, an annealing treatment at 300 to 600 ° C. for 0.5 hours or more can be performed. The required mechanical properties are not affected by annealing.

After cold working, machining can be performed. In the present embodiment, the machining is not limited to a specific content, and includes from the production of the shaped material to the finishing. For example, processes such as cutting, cold punching, cutting, laser processing, water jet processing, electric discharge processing, deep drawing processing, and welding can be exemplified. Further, the machining may include a step of assembling members and obtaining a product shape by welding. However, in the present embodiment, the type of machining or the like is not particularly limited.
Further, in machining, finishing can be performed to obtain a final product shape. Examples of the finishing process include cutting process and polishing process in this embodiment, but the type of the process is not particularly limited in the present invention.

Process for Producing Resin Material The resin member is suitably obtained by injection molding. In addition to normal injection molding, it is also possible to employ foam molding or blow molding. However, in the present invention, the resin material manufacturing method is not limited to injection molding.
The resin material can be molded by an injection molding machine using resin pellets produced by an extruder. Usable resins are PPS (polyphenylene sulfide) resin, PEEK (polyetheretherketone) resin, PPSU (polyphenylsulfone) resin, PBT (polybutylene terephthalate) resin, 66 nylon, PC resin whose shape does not change at 100 ° C PPS glass fiber reinforced resin, PEEK glass fiber reinforced resin, PBT glass fiber reinforced resin, 66 nylon glass fiber reinforced resin, 6 nylon glass fiber reinforced resin, and the like. Resin is molded by injecting molten resin into a mold. As the molding method, foam molding in which the inside of the resin member has a honeycomb structure or blow molding in which the resin member is hollow can be employed. Examples of the heat resistance include those exhibiting a deflection temperature under load of 100 ° C. or more with respect to a bending stress of 1.8 MPa, based on the provisions of JIS K7191.
The shape of the resin member is that the magnet is placed after the rotor is assembled, and the hole is opened in the center part where the material is arranged to fix the support body and the support body through the rotation shaft can do. However, the portion where the magnetic body is disposed does not necessarily have to be a hole, and it is sufficient that the support body is supported by a beam.

Manufacturing Process of Bearing Part The support body and the resin material can be fixed by caulking, screwing, welding, bonding, and outer periphery shrink fitting with a ring material. Furthermore, you may make it provide the bearing part which lets the axis | shaft of a rotor pass. Since the bearing portion is not affected by the magnet and does not need to be non-magnetic and does not require high strength, general steel, aluminum alloy, magnesium alloy, or the like can be used instead of high-strength non-magnetic steel. The production of each material may be carried out by conventional methods such as continuous casting, die casting, rolling, forging, and punching. The coupling between the bearing portion and the support body can be performed by caulking, screws, welding, adhesion, or the like.

Lamination / Bundling The rotor can be produced by laminating and bundling the support body and the resin material produced as described above. This may include a bearing portion. Lamination and bundling of the above members can be performed by one or a combination of caulking, screwing, welding, adhesion, outer periphery shrink fitting with a ring material, and the like.
This rotor can be mass-produced, and it becomes possible to manufacture a support suitable for a rotor for a motor, particularly an axial gap motor, which can be manufactured at low cost. In the support body, the relative permeability of the support body is less than 1.005, and the 0.2% proof stress at room temperature has a strength of 650 MPa or more.

(Embodiment 1)
Next, the motor rotor support body 100 of the present embodiment will be specifically described based on the attached drawings.
As shown in FIG. 6, the motor rotor support 100 has a resin material 10 interposed between two support bodies 1 and 1, and a bearing portion 20 interposed between the two support bodies 1 and 1. , Laminated and fixed.
The support body 1 is made of non-magnetic cast steel, and preferably has characteristics of a relative permeability of less than 1.005, a 0.2% proof stress at room temperature of 650 MPa or more, and an elongation of 10% or more. ing. The single material of the support body desirably has an elongation at room temperature of 10% or more. In order to ensure workability such as pressing, the elongation is preferably 10% or more in order to prevent the rotor from being broken and scattered during rotation.
The composition of the rotor support is preferably an 18Mn-18Cr-based material, and more preferably, by mass%, C: 0.07% or less, Si: 0.1-2.0%, Mn: 10-25%, Cr: 12-25%, N: 0.25-0.8%, Al: 0.005-0.02%, Ni: 5.0% or less, Mo + 1 / 2W: 3.0% Hereinafter, a composition containing V, Nb: 0.1% or less, Co: 3% or less, and B: 0.01% or less, with the balance being Fe and inevitable impurities can be used. The support body 1 has a specific gravity from 7.7 to 7.8, the electrical resistance has a characteristic of 6~9 × 10- ⁵ Ωcm. However, in the present invention, the specific gravity and electric resistance of the support body are not limited to these.

The support body 1 is a thin plate as a whole, is formed into a disk shape having a thickness of 1 to 4 mm by cold working of 10 to 40%, and a shaft hole 3 is formed at the center. A plurality of screw connection holes 4 are formed on the outer peripheral side of the shaft hole 3 at intervals in the circumferential direction. In addition, the connection hole 4 can be formed together at the time of machining, and you may form only the connection hole 4 in a post process.
Furthermore, substantially rectangular support holes 2 (16 in the present embodiment) are formed at equal angular intervals on the outer peripheral side of the support body 1. Each support hole 2 has a shape along the outer peripheral shape of the magnetic body since the magnetic body is fitted and held. In addition, the shape of a support hole can select a suitable shape according to a magnetic body. The support hole corresponds to the support portion of the present invention.

On the other hand, the resin material 10 is a thin plate as a whole and is formed in a disk shape having a thickness of 1 to 30 mm. Resin material 10 is PPS resin, PEEK resin, PPSU resin, PBT resin, 66 nylon, PC resin, PPS glass fiber reinforced resin, PEEK glass fiber reinforced resin, PBT glass fiber reinforced resin, 66 nylon glass fiber reinforced resin, 6 nylon. It is comprised with glass fiber reinforced resin etc., for example, is shape | molded by injection molding. The resin material 10 exhibits a deflection temperature under load of 100 ° C. or higher with a load of 1.8 MPa as described above.
The resin material 10 has an outer peripheral side ring portion 15 constituting the outer peripheral edge at substantially the same position as the outer peripheral edge of the support body 1, and through portions 11 (16 in the present embodiment) through which the magnetic body penetrates inside. Are formed at equal intervals. An inner peripheral ring portion 14 is provided on the inner peripheral side of the penetrating portion 11. An inner side of the ring portion 14 has an annular hole 13 having a diameter larger than that of the shaft hole 3 of the support body 1. Therefore, the resin material 10 is interposed between the support bodies 1 and 1 only on the outer peripheral side.

The through portions 11 are formed so that 16 pieces are positioned at equal angular intervals between the outer ring portion 15 and the inner ring portion 14, and between the adjacent through portions 11, the beam portions 12 are formed. have. In the through portion 11, when the support body 1 and the resin material 10 are laminated, the respective support holes 2 and the through portions 11 have the same positional relationship by mutual alignment. The penetrating part 11 has a penetrating shape that is slightly larger than the supporting hole 2 as a whole, and the inner peripheral edge of the penetrating part 11 is located outside the outer peripheral edge of the supporting hole 2. When the magnetic body is fitted into the support hole 2 and penetrates the through portion 11, the magnetic body and the edge of the through portion 11 have a gap G over the entire circumference, and the magnetic body and the through portion 11 are at least It will be in a non-contact state with the outer periphery of a magnetic body. Note that the gap may be provided only between the outer peripheral edge of the magnetic body and the penetrating portion 11.
The beam portion 12 described above can increase the rigidity of the support, and the rigidity of the support is further increased by the inner ring portion 14 and the outer ring portion 15. In addition, although the penetration part 11 is formed in the hole shape in the above, it can also be set as the shape where the outer peripheral side and the inner peripheral side are open | released, for example.

Next, the bearing portion 20 is formed in a disc shape with the same thickness as the resin material 10, and the diameter thereof is set to fit within the annular hole 13. The bearing portion 20 is made of any one of general steel, aluminum alloy, and magnesium alloy, and it does not matter whether it is nonmagnetic.
In this embodiment, the bearing portion 20 is located in the annular hole 13 of the resin material 10 with almost no gap. Further, in the bearing portion 20, a plurality of connection holes 22 are formed at intervals in the circumferential direction according to the position of the connection hole 4 of the support body 1, and the shaft hole 3 of the support body 1 is formed in the center. A shaft hole 21 is formed in accordance with the position. In addition, the connection hole 22 can be formed according to the shape change of a support body at the time of machining, and you may form only the connection hole 22 in a post process.

The support body 100, the resin material 10, and the bearing portion 20 are stacked to constitute the support body 100.
Between the two support bodies 1, 1, the bearing portion 20 and the resin material 10 are arranged so as to intervene and are laminated with their positions aligned.
By the alignment, the support hole 2 of the support body 1 and the penetrating portion 11 of the resin material 10 are positioned so that the holes overlap each other, and the shaft hole 3 of the support body 1 and the shaft hole 21 of the bearing portion 20 are located. It arrange | positions coaxially and each connection hole 4 of the support body 1 and each connection hole 22 of the bearing part 20 are arrange | positioned coaxially. Between the support holes 2 and 2 of the two support bodies 1 and 1, permanent magnets 30 and 31 having magnetic poles having different polarities on both sides in the axial direction are fitted as magnetic bodies so that the magnetic poles on the surface are alternately changed. . In other words, the permanent magnets 30 and 31 that are adjacent to each other in the circumferential direction of the support body 1 have alternating magnetic poles on the surface. Between the support bodies 1, 1, the resin material 10 is located in the vicinity of the periphery of the permanent magnets 30, 31.
The support body 1, 1 and the bearing portion 20 are bound by passing the screw 25 through the through holes 4, 22, 4 and screwing the nut 26. In addition, a thread groove may be formed in the through holes 4 and 22, and the screw 25 may be screwed as it is.
The resin material 10 can be bound to the support bodies 1 and 1 by adhesion or the like.

Furthermore, a rotation shaft (not shown) can be attached to the shaft holes 3 and 21 of the motor rotor support body 100 and used as a motor rotor support body provided in the rotor. The motor rotor support body 100 may be used as it is as a rotor.
In the above description, only the permanent magnet is described as the magnetic body supported by the motor rotor support body. However, the magnetic body may have a structure that supports a ferromagnetic body.
The motor rotor support of this embodiment is not particularly limited in output, etc., but can be suitably used particularly for motors of 5 kW or more, can be mass-produced and can be manufactured at low cost, In particular, it can be used as a support suitable for a rotor of an axial gap motor.

  In the above-described embodiment, the resin material is composed of one layer. However, the resin material may be composed of a plurality of layers. In this case, the material may be different between the layers. In the resin material of a relatively high strength material, the shape may be able to support the permanent magnet in the penetrating portion. In the resin material of a relatively low strength material, as described above, between the permanent magnet, It is desirable to have a gap at least at the outer periphery of the permanent magnet.

(Embodiment 2)
Next, another embodiment will be described with reference to FIGS.
In this embodiment, the support body 1A, 1A and the resin material 10A are laminated and fixed to constitute a motor rotor support 100A. In addition, the bearing part to which the rotating shaft which is not shown in figure can be attached can be provided by a suitable structure, and description of a bearing part is abbreviate | omitted below.
The support body 1A and the resin material 10A can be manufactured through the same manufacturing process as in the above embodiment, and detailed description thereof is omitted.

The support body 1A is made of non-magnetic steel, and preferably has characteristics of a relative permeability of less than 1.005, a 0.2% proof stress at room temperature of 650 MPa or more, and an elongation of 10% or more. ing.
As shown in FIG. 8, the support body 1A is formed in a disk shape having a thickness of 1 to 2 mm in this embodiment. Support holes 2A having a substantially rectangular shape are formed at equal angular intervals on the outer peripheral side, and support holes 2B having a shape smaller than the support hole 2A are formed at equal angular intervals on the inner peripheral side, and the support holes 2A And the support hole 2B are disposed along the same radial direction. A shaft hole 3A is formed in the center on the inner peripheral side of the support hole 2B. Each of the support hole 2A and the support portion 2B corresponds to a support portion of the present invention.
In this embodiment, each support hole 2A, 2B has a shape along the outer peripheral shape of the magnetic body because the magnetic body is fitted and held therein.

  The resin material 10A is a thin plate as a whole, and is formed in a disk shape having a thickness of 1 to 10 mm in this embodiment. The resin material 10A has an outer peripheral side ring portion 15A that constitutes the outer peripheral edge at substantially the same position as the outer peripheral edge of the support body 1A, and a penetrating portion 11A (8 in this embodiment) through which the magnetic body penetrates. Are formed at equal intervals. The inner peripheral side of the penetrating part 11 has a first inner peripheral ring part 14A, and through parts 11B (eight in this embodiment) through which the magnetic material penetrates are formed at equal intervals. . The penetration part 11B has a smaller shape than the penetration part 11A. A second inner peripheral ring portion 14B is provided on the inner peripheral side of the penetrating portion 11B, and an annular hole 13A having the same diameter as the shaft hole 3A of the support body 1A is provided on the inner peripheral side. Accordingly, the resin material 10A is interposed between the support bodies 1A and 1A only on the outer peripheral side.

11 A of penetration parts are formed so that eight may be located at equiangular intervals between 15 A of outer periphery side ring parts, and 14 A of 1st inner periphery side rings, and between adjacent penetration parts 11A, a beam Part 12A. Further, eight through portions 11B are formed so as to be positioned at equal angular intervals between the first inner ring portion 14A and the second inner ring portion 14B, and adjacent through portions 11B. In between, it has the beam part 12B.
When the support body 1A and the resin material 10A are laminated, the through-holes 11A and 11B have the same positional relationship between the support holes 2A and the through-holes 11A by mutual alignment, and the through-holes 11A and 11B penetrate the support holes 2B and 11B. The holes 11B are formed so as to have the same positional relationship.

The penetrating part 11A has a penetrating shape that is slightly larger than the entire region extending over the two support holes 2A, and the penetrating part 11B has a penetrating shape that is slightly larger than the entire region extending over the two supporting holes 2B. The inner peripheral edge of the through-hole 11A is located outside the outer peripheral edges of the support holes 2A and 2A, and the inner peripheral edge of the through-hole 11B is located outside the outer peripheral edges of the support holes 2B and 2B. When the magnetic body is fitted into the support holes 2A and 2B and penetrates the through portions 11A and 11B, the magnetic body and the inner periphery of the through portions 11A and 11B have a gap over the entire circumference, and the magnetic body and the through portion 11A and 11B are in a non-contact state with at least the outer peripheral edge of the magnetic material.
The beam portions 12A and 12B described above can increase the rigidity of the support, and the rigidity of the support is further increased by the first inner ring side ring portion 14A, the second inner ring side ring 14B, and the outer ring side ring portion 15A.

The support bodies 1A and 1A and the resin material 10A are laminated so that the resin material is interposed between the support bodies 1A and 1A, and are bound by an appropriate method.
At the time of stacking, alignment is performed so that the two support holes 2A, 2A overlap each through-hole 11A and the two support holes 2B, 2B overlap each through-hole 11B. The bundling method is not particularly limited, and can be performed by caulking, screwing, welding, adhesion, outer periphery shrink fitting with a ring material, or a combination thereof.

In the laminated and bound motor rotor support 100A, permanent magnets 30A and 31A having magnetic poles with different polarities on both axial sides as magnetic bodies between the support holes 2A and 2A of the two support bodies 1A and 1A. Are fitted so that the magnetic poles on the surface alternate. In other words, the permanent magnets 30A and 31A adjacent to the support body 1A in the circumferential direction have alternating magnetic poles on the surface. Between the support holes 2B and 2B of the two support bodies 1A and 1A, permanent magnets 30B and 31B having magnetic poles having different polarities on both sides in the axial direction are fitted as magnetic bodies so that the magnetic poles on the surface are alternately changed. . In other words, the permanent magnets 30B and 31B adjacent to the support body 1A in the circumferential direction are alternately changed in surface magnetic poles. Further, the permanent magnets arranged in the same radial direction in the support holes 2A and 2B are arranged so as to have the same magnetic pole.
In the resin material 10A, two permanent magnets 30A and 31A pass through each penetrating portion 11A, and the inner peripheral edge of the penetrating portion 11A is not in contact with the permanent magnets 30A and 31A. In each penetration part 11B, the two permanent magnets 30B and 31B have penetrated, and the inner periphery of the penetration part 11B is non-contact with the permanent magnets 30B and 31B.
In this embodiment, the size of the penetrating part is set so as to be positioned around the plurality of magnetic bodies. However, if the rigidity is sufficient, it is not necessary to form the penetrating part for each individual magnetic body. A suitable shape and number of through portions may be formed depending on the degree of rigidity.

That is, a part of the resin material 10A is located between the support bodies 1A and 1A in the vicinity of the periphery of the permanent magnets 30A, 30B, 31A, and 31B.
A rotation shaft (not shown) can be attached to the shaft holes 3A and 12A of the motor rotor support 100A and used as a motor rotor support provided in the rotor. The motor rotor support 100A may be used as a rotor as it is.
The motor rotor support of this embodiment is not particularly limited in output, but can be suitably used for a motor of 5 kW or more, and can be mass-produced and manufactured at low cost. In particular, it can be used as a support suitable for a rotor of an axial gap motor.

In each embodiment, the shape of the support body, the resin material, and the bearing portion may be any shape as long as the functions of securing the rigidity in the axial direction and the fixing of the bearing portion are fulfilled.
In stacking and restraining, an appropriate method such as caulking, screwing, welding, or adhesion can be employed.

(Embodiment 3)
Furthermore, another embodiment is described based on FIG.
In this example, a motor rotor support 100C will be described as a modified example of the motor rotor support shown in FIG. In addition, the same code | symbol is attached | subjected about the same structure and the description is abbreviate | omitted.
The support body 1C, 1C has a bent portion 5 extending toward the resin material 10 interposed on the outer peripheral edge of the disk shape, and the bent portions 5, 5 are in contact with each other at the time of incorporation or are spaced apart from each other. Is formed. The bent portion 5 is located outside the outer peripheral surface of the interposed resin material 10. At that time, it may be formed so as to be in contact with the resin material 10 or may be formed so as to have a gap. The bent portion 5 may be provided over the entire outer periphery of the support body 1 or may be provided in a part of the outer periphery. The bent portion 5 may be formed integrally with the support body 1 or may be fixed by welding or the like. Moreover, it may be formed in a ring shape and fitted between the support bodies 1 and 1.
The bent portion 5 can be disposed so as to surround the resin material 10, and protects the resin material 10, and when the resin material 10 is damaged, the damaged resin is scattered to cause a motor failure or the like. To prevent.

(Embodiment 4)
In each of the above embodiments, the resin material is described as being interposed between the two support bodies. However, it may have three or more support bodies, and in that case, the support material is interposed between the support bodies. It may have two or more resin materials. Below, embodiment which has a 2 or more resin material is described based on FIGS.
The support body 100D includes a support body body 1D as a central layer and support body bodies 1E and 1E as outermost layers, and a resin material 10D is interposed between the support body body 1D and the support body body 1E. .

The support bodies 1D and 1E are made of non-magnetic cast steel. Preferably, the relative permeability is less than 1.005, the 0.2% proof stress at room temperature is 650 MPa or more, and the elongation is 10% or more. Have. The single material of the support body desirably has an elongation at room temperature of 10% or more. The composition of the rotor support is preferably an 18Mn-18Cr-based material, and more preferably, by mass%, C: 0.07% or less, Si: 0.1-2.0%, Mn: 10-25%, Cr: 12-25%, N: 0.25-0.8%, Al: 0.005-0.02%, Ni: 5.0% or less, Mo + 1 / 2W: 3.0% Hereinafter, a composition containing V, Nb: 0.1% or less, Co: 3% or less, and B: 0.01% or less, with the balance being Fe and inevitable impurities can be used. The support body 1D, 1E has a specific gravity from 7.7 to 7.8, the electrical resistance has a characteristic of 6~9 × 10- ⁵ Ωcm.
In addition, it is possible to use the nonmagnetic steel of a different material by support body 1D, 1E. For example, a material having high strength can be used for the support body 1D, and general non-magnetic stainless steel (for example, JIS SUS304) having low strength can be used for the support body 1E. Moreover, it is also possible to comprise the intermediate | middle layer equivalent to the support body 1E with a fiber reinforced resin material with high intensity | strength. In this case, in the fiber reinforced resin material, it is desirable to hold the magnetic body by the through portion.

The support bodies 1D and 1E are thin as a whole, and are formed into a disk shape having a thickness of 1 to 2 mm by cold working of 10 to 40%, and a shaft hole 3D is formed at the center. A plurality of connecting holes 4D for screwing are formed on the outer peripheral side of the shaft hole 3D at intervals in the circumferential direction.
Further, substantially rectangular support holes 2D and 2E (16 in each embodiment) are formed at equal angular intervals on the outer peripheral side of the support bodies 1D and 1E. Each of the support holes 2D and 2E has a shape along the outer peripheral shape of the magnetic body since the magnetic body is fitted and held.
Moreover, in support body main body 1D, 1E, the chip | tip part for lacking the continuity of nonmagnetic steel can be provided in a part of periphery of support hole 2D, 2E. In the support body 1D, an electromagnetic induction current is generated around the magnetic body and iron loss is likely to occur. Therefore, it is desirable to block the current path by providing a chipped portion.

In the support body 1D, a notch 6D is formed as a notch in the ring portion on the outer peripheral side of the support hole 2D. The notch 6D may be provided corresponding to each support hole 2D, or may be formed so as to have one notch corresponding to the plurality of support holes 2D.
Further, in the support body 1E, a notch 6E is formed as a notch in the ring portion on the inner peripheral side of the support hole 2E. The notch 6E may be provided corresponding to each support hole 2E, or may be formed so as to have one notch corresponding to the plurality of support holes 2E.
The notches 6D and 6E can be formed by cutting or the like, and the manufacturing method is not particularly limited.
In the plurality of support bodies, the rigidity of the entire support body can be kept good by changing the position of the chipped portion.

FIG. 16 shows an example of a change in the chipped portion in the support body.
The support body 1F of this modified example is made of nonmagnetic steel as in the above embodiment, and there is no particular change in the material and manufacturing process.
The support body 1F is a thin plate as a whole, is formed into a disk shape having a thickness of 1 to 2 mm by cold working of 10 to 40%, and a shaft hole 3F is formed at the center. A plurality of connecting holes 4F for screwing are formed at intervals in the circumferential direction on the outer peripheral side of the shaft hole 3F.
Further, substantially rectangular support holes 2F (16 in each embodiment) are formed at equal angular intervals on the outer peripheral side of the support body 1F. Each support hole 2F has a shape along the outer peripheral shape of the magnetic body because the magnetic body is fitted and held.
Further, in the support body 1F, every other notch portion 6F is formed in the beam portion 7 between the adjacent support holes 2F, 2F. In the beam portion 7, it is desirable to provide one notch portion with a plurality of beam portions 7 instead of providing each notch portion in terms of strength. However, if there is no problem in terms of strength, a notch portion may be provided in each beam portion 7.
Note that the cutout portions 6D, 6E, and 6F described above may not be left as cutouts, but may be provided with an insulating resin or the like interposed therebetween to avoid strength reduction.

The resin material 10D interposed between the support bodies 1D and 1E described above is a thin plate as a whole and is formed in a disk shape having a thickness of 1 to 10 mm. Resin material 10D is PPS resin, PEEK resin, PPSU resin, PBT resin, 66 nylon, PC resin, PPS glass fiber reinforced resin, PEEK glass fiber reinforced resin, PBT glass fiber reinforced resin, 66 nylon glass fiber reinforced resin, 6 nylon. It is comprised with glass fiber reinforced resin etc., for example, is shape | molded by injection molding. The resin material 10D exhibits a deflection temperature under a load of 100 ° C. or higher with a load of 1.8 MPa as described above.
The resin material 10D has an outer peripheral side ring portion 15D that constitutes the outer peripheral edge at substantially the same position as the outer peripheral edge of the support body 1D, 1E, and a through portion 11D (16 in this embodiment) through which the magnetic material penetrates. Are formed at equal intervals. An inner peripheral side ring portion 14D is provided on the inner peripheral side of the penetrating portion 11D, and an inner side of the ring portion 14D has an annular hole 13D. Accordingly, the resin material 10D is interposed between the support bodies 1D and 1E only on the outer peripheral side.

The penetrating portions 11D are formed so that 16 pieces are positioned at equiangular intervals between the outer peripheral side D ring portion 15D and the inner peripheral side ring portion 14D, and between the adjacent penetrating portions 11D, the beam portion 12D is formed. Have. In the through portion 11D, when the support bodies 1D and 1E and the resin material 10D are stacked, the support holes 2D and 2E and the through portion 11D have the same positional relationship by mutual alignment. The penetrating part 11D has a penetrating shape that is slightly larger than the supporting holes 2D and 2E as a whole, and the inner peripheral edge of the penetrating part 11D is located outside the outer peripheral edge of the supporting holes 2D and 2E. When the magnetic body is fitted into the support holes 2D and 2E and penetrates the through portion 11D, the magnetic body and the edge of the through portion 11D have a gap over the entire circumference. It will be in a non-contact state at least with the outer periphery of a magnetic body. In addition, you may have a clearance gap between the outer periphery of a magnetic body, and penetration part 11D.
The beam portion 12D described above can increase the rigidity of the support body, and the rigidity of the support body is further increased by the inner ring portion 14D and the outer ring portion 15D. In the above description, the penetrating portion 11D is formed in a hole shape. However, the penetrating portion 11D may have a shape such that the outer peripheral side or the inner peripheral side is opened.

The support body 100D is configured by laminating the support body 1D, the resin material 10D, the support body 1E, the resin material 10D, and the support body 1D.
Between the support holes 2D, 2E, and 2D of the support bodies 1D, 1E, and 1D, a permanent magnet 30D having magnetic poles with different polarities on both sides in the axial direction is fitted as a magnetic body so that the magnetic poles on the surface are alternately changed. . That is, the magnetic poles on the surface of the permanent magnets 30D adjacent to each other in the circumferential direction of the support bodies 1D and 1E are alternately changed. Between the support body 1D and 1E, the resin material 10D is located in the vicinity of the periphery of the permanent magnet 30D.
The support body 1D, the resin material 10D, and the support body 1E can be bound together by bonding, screws, or the like.

50 kg of 18Mn-18Cr nonmagnetic steel was melted by VIM (vacuum induction melting) with each of the compositions shown in Table 1 (the balance being Fe and inevitable impurities), and die casting was performed to obtain 50 kg of a test steel ingot (sample material) No. 1-9). The main body part obtained by cutting the test steel ingot was hot-rolled at 1200 ° C. by hot forging and a hot rolling rate of 90% or more to obtain a test material having a thickness of 4 to 6 mm × 200 mm. As comparative materials, test materials having compositions outside the scope of the present invention (steel No. 10-13), SUS304 stainless steel (steel No. 15), and SUS316 stainless steel (steel No. 14) are also the same. Obtained by the method.
These test materials were subjected to a water-cooling solution treatment at 1050 ° C. for 3 hours. As shown in Table 2, these test materials were subjected to 0 to 50% cold rolling to obtain test materials having a thickness of 1 to 4 mm. From these test materials, cold stamping was performed at room temperature by cold pressing to obtain test materials corresponding to the support body shape material. Test specimens were collected from this specimen in the same manner as described above, and the relative permeability was measured at room temperature by a tensile test and a magnetic balance method. Moreover, the specific gravity of each test piece was 7.7 to 7.8. Furthermore, the electrical resistance of the support body was 6~9 × 10- ⁵ Ωcm.

Further, as a resin material interposed between the support bodies, a PPS resin was used to produce a plate thickness of 4 to 24 mm by injection molding. The specific gravity of this resin material was 1.34, and the electric resistance was 10 ¹⁶ Ωcm. Further, the deflection temperature when a load of 1.8 MPa was applied was 108 ° C. at a deflection temperature under load determined by JIS K7191 or the like.

  Table 2 shows the test results. From the test results, the sample materials of the invention (sample materials No. 2, 3, 6, 7, 10, 11, 14, 15, 18, 19, 22, 23, 26, 27, 30, 31, 34, 35), the 0.2% proof stress is secured at 650 MPa or more, the tensile elongation is 10% or more, and the relative permeability is sufficiently low. On the other hand, the test sample No. 37, 38, 41, 45, 49, 53, 54, 57, 58, the 0.2% proof stress was not secured at 650 MPa or more. In 40, 44, 47, 48, 51, 52, the tensile elongation was less than 10%. In 39, 40, 42 to 44, 45 to 48, 50 to 52, 55, 56, 59, and 60, the relative permeability is 1.005 or more, and it can be said that the material of the comparative example is not suitable for the motor rotor support. .

In addition, it is understood that the relative permeability of the sample material of the invention example does not change even when cold working is performed, and there is no transformation to ferrite or martensite due to work induction (sample materials No. 1 to 4, 5-8, 9-12, 13-16, 17-20, 21-24, 25-28, 29-32, 33-36). On the other hand, in the test material of the comparative example, the relative permeability increases as the cold rolling processing rate increases, and it can be inferred that processing-induced transformation occurs (test materials No. 37 to 40, 41 to 44, 45). -48, 49-52, 53-56, 57-60), it turns out that the relative magnetic permeability characteristic is inferior to the test material of a comparative example.
Based on the above evaluation results, the ones that cleared all with the criteria that the 0.2% proof stress is 650 MPa or more, the elongation is 10% or more, and the relative permeability is less than 1.005. X was evaluated and the results are shown in Table 2.

In addition, 0.2% proof stress is increased with the increase in the cold rolling process rate in the test material, but the test material of the present invention example is the test of the comparative example regardless of the cold rolling process rate. It has a 0.2% proof stress greater than that of the material, and it can be seen that it is excellent in strength.
Further, the sample material of the present invention example has a stable non-magnetic characteristic with almost no change in the relative permeability even when the cold rolling process rate is increased. On the other hand, in the test material of the comparative example, it can be seen that when the cold rolling processing rate is increased, the relative permeability is rapidly increased, and the relative permeability is adversely affected.
From these points, it is difficult to increase the strength by cold working while maintaining the nonmagnetic characteristics in the test material of the comparative example, and in the test material of the present invention, the nonmagnetic characteristics are maintained. It can be seen that the strength can be increased by cold working.

  Although the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.

DESCRIPTION OF SYMBOLS 1 Support body 1A Support body 1C Support body 2 Support hole 2A Support hole 2B Support hole 3 Shaft hole 3A Shaft hole 4 Connection hole 5 Bending part 10 Resin material 10A Resin material 11 Through part 11A Through part 11B Through part 12 Beam Part 12A Beam part 14 Inner peripheral side ring part 14A First inner peripheral side ring part 14B Second inner peripheral side ring part 15 Outer peripheral side ring part 20 Bearing part 21 Shaft hole 22 Connecting hole 100 Motor rotor support body 100A Motor rotor Support

Claims (19)

  A plurality of support bodies made of non-magnetic steel for supporting a magnetic body disposed on a rotor of a motor, having a relative magnetic permeability of less than 1.005 and a 0.2% proof stress at room temperature of 650 MPa or more. A motor rotor support body, wherein at least two resin materials interposed between the support body bodies are laminated.   The support body has a support portion that fits the magnetic body and supports the periphery of the magnetic body, and the resin material penetrates through the magnetic body and is at least non-contact with the outer periphery of the magnetic body The motor rotor support according to claim 1, further comprising a portion.   The nonmagnetic steel is in mass%, C: 0.07% or less, Si: 0.1-2.0%, Mn: 10-25%, Cr: 12-25%, N: 0.25-0 0.8%, Al: 0.005 to 0.02%, Ni: 5.0% or less, Mo + 1 / 2W: 3.0% or less, V, Nb: 0.1% or less, Co: 3% or less, and B The motor rotor support according to claim 1, wherein the motor rotor support has a composition containing 0.01% or less, and the balance being Fe and inevitable impurities.   The motor rotor support according to any one of claims 1 to 3, wherein the support body is made of a cold-worked material of the nonmagnetic steel.   The motor rotor support according to claim 1, wherein the resin material includes a resin and a reinforcing material.   The motor rotor support according to claim 1, wherein the resin material exhibits a deflection temperature under load of 100 ° C. or more with respect to a bending stress of 1.8 MPa.   The motor rotor support according to any one of claims 1 to 6, wherein the resin material is an injection-molded body.   The motor rotor support according to any one of claims 1 to 7, wherein the magnetic body is at least one of a rare earth magnet and a non-rare earth magnet.   The motor rotor support according to any one of claims 1 to 8, wherein the non-rare earth magnet includes a ferrite magnet.   The motor rotor support according to any one of claims 1 to 9, wherein the magnetic body includes a dust core.   11. The support body and the resin material are laminated and fixed by at least one of caulking, screwing, welding, adhesion, and outer periphery shrink fitting with a ring material. The motor rotor support described.   The said resin material is interposed between the said support body main bodies in the outer peripheral side of the bearing part to which the rotating shaft which rotates the said support body is attached, The any one of Claims 1-11 characterized by the above-mentioned. Motor rotor support.   The motor rotation according to any one of claims 1 to 12, further comprising a bearing portion to which a rotation shaft for rotating the support is attached between the support bodies in which the resin material is interposed. Child support.   The bearing portion is not required to have nonmagnetic properties, and is made of any one of general steel, an aluminum alloy, and a magnesium alloy, and is fixed to at least one of the support body and the resin material. Item 14. A motor rotor support according to Item 13.   At least one of the support main bodies in which the resin material is interposed has a bent portion that extends to the resin material side and is located outside the outer peripheral surface of the resin material on a part or all of the periphery thereof. The motor rotor support according to claim 1, wherein the motor rotor support is according to claim 1.   A non-magnetic steel is cold worked to produce a plurality of support bodies having a relative magnetic permeability of less than 1.005 and a 0.2% proof stress at room temperature of 650 MPa or more, and a resin material between at least two of the support bodies A method for manufacturing a motor rotor support, comprising: stacking and fixing to each other.   The method of manufacturing a motor rotor support according to claim 16, wherein a cold working rate of the cold working is 10 to 40%.   18. The method of manufacturing a motor rotor support according to claim 16, wherein after the cold working, the nonmagnetic steel is subjected to an annealing treatment of 300 to 600 ° C. × 0.5 hours or more.   The method of manufacturing a motor rotor support according to any one of claims 16 to 18, wherein the support body is machined with respect to a rough material to be the support body.

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