WO2016121149A1 - Élément adhésif d'aimant - Google Patents

Élément adhésif d'aimant Download PDF

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Publication number
WO2016121149A1
WO2016121149A1 PCT/JP2015/072358 JP2015072358W WO2016121149A1 WO 2016121149 A1 WO2016121149 A1 WO 2016121149A1 JP 2015072358 W JP2015072358 W JP 2015072358W WO 2016121149 A1 WO2016121149 A1 WO 2016121149A1
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WIPO (PCT)
Prior art keywords
magnet
adhesive
elastic modulus
mpa
bonded
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PCT/JP2015/072358
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English (en)
Japanese (ja)
Inventor
上山　幸嗣
広紀 小林
茂 内海
長谷川　覚
進 大島
Original Assignee
三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2016571663A priority Critical patent/JP6266138B2/ja
Priority to CN201580073752.3A priority patent/CN107210112B/zh
Publication of WO2016121149A1 publication Critical patent/WO2016121149A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • C09J201/02—Adhesives based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets

Definitions

  • the present invention relates to a magnetic bonded body applied to a motor or the like that requires high performance characteristics, such as a robot, an elevator, and an automobile, and more particularly, neodymium (Nd) -iron (Fe) with respect to an iron-based soft magnetic material.
  • the present invention relates to a magnet bonded body in which a boron (B) permanent magnet is bonded with an adhesive.
  • the rare earth magnet is a sintered body and exhibits an expansion coefficient different from that of iron
  • various types of magnet adhesives have been proposed in consideration of magnet cracking due to temperature changes when the motor is used. Further, in order to disassemble the magnet, it is necessary to use one that decomposes the adhesive itself, or to decompose the adhesive by thermal oxidation and to demagnetize the magnet. In addition, the level of handling differs depending on whether it is recovered as a raw material or as a magnet.
  • a method is disclosed in which a magnet is easily separated from a base material by adding thermally expandable fine particles into an adhesive (see, for example, Patent Document 1). Also disclosed is a method of demagnetizing an adhesive body between magnets at 200 to 350 ° C., then carbonizing the adhesive in a range of 350 to 1000 ° C., and then polishing the surface (see, for example, Patent Document 2). ).
  • Patent Document 3 a method for preventing magnet breakage by bonding a magnet and a shaft using a fluid silicone rubber adhesive with respect to temperature change during use of a motor is disclosed (for example, see Patent Document 3).
  • Patent Document 4 a method for preventing magnet breakage by bonding a magnet and a shaft using a fluid silicone rubber adhesive with respect to temperature change during use of a motor is disclosed.
  • a method is disclosed in which a certain clearance is provided between a magnet and a shaft and a silicone adhesive is filled to prevent magnet cracking during temperature changes (see, for example, Patent Document 4).
  • the prior art has the following problems. That is, the method of Patent Document 1 has a problem that when the magnet is peeled from the substrate, the heating temperature is insufficient and the demagnetizing force of the magnet itself is insufficient. Further, in the method of Patent Document 2, since a stress field due to adhesion between anisotropic materials of magnet and iron is not formed, the load on the magnet due to thermal stress is small, which is different from the dissimilar material adhesion. There is a problem that it is not suitable for disassembling and reusing the magnet adhesive.
  • Patent Documents 3 and 4 are designed not to cause magnet cracking due to thermal history during use, but allow the magnet to be demagnetized or thermally oxidized so that the adhesive can be removed at 350 ° C. or higher. When heat is applied, there is a problem that the soundness of the magnet is not ensured.
  • the present invention has been made to solve the above-described problems. Even when a rare earth magnet is bonded to a soft magnetic material and a load due to a heat cycle is applied for a long time, it is disassembled by heating. An object of the present invention is to obtain a magnet bonded body that can be reused while securing the material strength without dissolving the obtained rare earth magnet.
  • the magnet bonded body according to the present invention is a magnetic bonded body in which a Nd—Fe—B based magnet and a soft magnetic body are bonded with an adhesive, and the adhesive has a minimum operating temperature of 10 ° C. or lower during cooling.
  • the main component whose elastic modulus at a frequency of 0.1 Hz is 5 ⁇ 10 6 to 5 ⁇ 10 7 Pa is a non-silicone adhesive, and the dynamic elastic modulus at frequencies of 20 Hz and 0.1 Hz.
  • the elastic modulus at 0.1 Hz is 60% or less of the elastic modulus at 20 Hz, the thickness is 30 ⁇ m or more, and the thermal stress generated inside the magnet by adhesion is 10 MPa or less in terms of Mises equivalent stress. There is something.
  • the adhesive is a main component having an elastic modulus of 5 ⁇ 10 6 to 5 ⁇ 10 7 Pa at a frequency of 0.1 Hz in a region where the lowest use temperature is 10 ° C. or lower during cooling.
  • Is a non-silicone adhesive and when the dynamic elastic modulus at a frequency of 20 Hz and 0.1 Hz is compared, the elastic modulus at 0.1 Hz is 60% or less of the elastic modulus at 20 Hz, and the thickness Is 30 ⁇ m or more, and the thermal stress generated inside the magnet by adhesion is 10 MPa or less in terms of Mises equivalent stress.
  • the rare earth magnet was bonded to the soft magnetic material and the load due to the heat cycle was applied for a long time and then disassembled by heating, the material strength was ensured without dissolving the obtained rare earth magnet. It can be reused as it is.
  • FIG. 1 is a perspective view showing a magnet bonded body according to Embodiment 1 of the present invention.
  • the magnet bonded body according to the present invention is cooled and subjected to a thermal stress load on the magnet in a state where the aging of the adhesive has progressed and the elastic modulus has been increased. Even when a load due to oxidation is further applied, the magnet is not lethal in terms of mechanical strength.
  • this magnet adhesive body 10 is composed of a magnet 1 having an adhesive surface, a soft magnetic body 2 made of, for example, iron, and an adhesive 3 having a predetermined elastic modulus.
  • the magnet 1 is desirably an Nd—Fe—B based sintered magnet in view of performance.
  • the Nd—Fe—B system not only follows the usual manufacturing method but also selectively distributes rare earth such as dysprosium and terbium at the grain boundaries of the magnet to improve the magnetic properties. It may be.
  • the surface of the magnet 1 may be any surface as long as it can be bonded and the coating strength on the surface is not greatly reduced by the internal stress of the bonding.
  • the surface layer has a coating film such as an oxide film or alkyl silicate whose magnetic composition has been altered, or a chemical conversion treatment applied to iron such as zinc phosphate, zirconium fluoride, or chromium. The thing which was done is mentioned.
  • the surface of the metal system may be applied with electro Ni plating, electroless Ni plating, zinc plating, chrome plating, copper plating, vapor deposition film of pure aluminum or aluminum alloy, or chemical conversion treatment. It may be. Further, it may be a coating mainly composed of an organic polymer such as epoxy, phenol, acrylic, polyester, polyimide, and polyamideimide.
  • zinc rich paint in which zinc flakes and aluminum flakes are mixed may be applied, or a film such as electrodeposition coating or powder coating may be used.
  • a film such as electrodeposition coating or powder coating may be used.
  • an aluminum vapor-deposited film, a heat-resistant organic coating, or the like is desirable.
  • the magnet and the soft magnetic material may be coated in consideration of corrosion resistance.
  • a metal-based film is desirable from the viewpoint that the pre-adhesion treatment when reused is simple, and a galvanized or aluminum vapor-deposited film, or a chemical conversion treatment on the surface thereof It is preferable to use those that have been applied.
  • the size of the magnet 1 may be any size depending on the design of the motor or magnetic circuit, but if it is a small shape, thermal stress will not be a problem, so the shape is approximately 10 mm ⁇ 10 mm or larger. It is necessary that the adhesive has an area. In addition, there is no upper limit in particular in the direction which becomes large, but if the size which can manufacture the magnet 1 is considered, the adhesive area of about 100 mm x 100 mm will be a realistic range.
  • the elastic modulus of the adhesive 3 is an important value that stabilizes the elastic modulus by advancing the aging of the material to be bonded and fixed due to the heat generated from the product while the magnet bonded body 10 is used. Further, as the internal stress of the magnet bonded body 10, the temperature difference when the thermal stress is calculated based on the temperature difference from the highest temperature zone to the lowest temperature zone of the product specification may be used.
  • the adhesive 3 used in the first embodiment of the present invention has an elastic modulus of 5 ⁇ 10 6 to 5 ⁇ 10 7 Pa at a frequency of 0.1 Hz in a region where the minimum use temperature is 10 ° C. or less during cooling.
  • Is a non-silicone-based adhesive and when the dynamic elastic modulus at a frequency of 20 Hz and 0.1 Hz is compared, the elastic modulus at 0.1 Hz is 60% or less of the elastic modulus at 20 Hz.
  • the lower limit is about 5%. If it is lower than 5%, extremely large stress relaxation occurs, resulting in a state like an adhesive, which is too soft to be suitable as a fixing member.
  • silane-modified polymer a silylated acrylate, a polyisobutylene, a modified silicone, a polysulfide, a modified polysulfide, an acrylic urethane, a polyurethane, an acrylic, and an epoxy adhesive, Those that satisfy the conditions are listed.
  • silicone-based adhesives cannot be reliably decomposed in the temperature range of 350 to 400 ° C. when the magnet 1 is reused. Since it adheres as a substance, it is not suitable for this invention.
  • the elastic modulus of the adhesive 3 is set to the above-mentioned value because the use of the magnet bonded body 10 may cause the position accuracy to deteriorate if an excessively soft material is used. Further, the elastic modulus of the adhesive 3 is expressed by a relaxed elastic modulus at the time of the most cooling. For the degree of relaxation, a value detected at a frequency of 0.1 Hz is used as the storage elastic modulus value in dynamic viscoelasticity when the elastic modulus is measured. This is because the elastic modulus is lowered due to the viscoelastic properties of the adhesive when the minimum temperature is reached.
  • a value suitable for the present invention can be obtained by measuring at a frequency of about 0.1 Hz or less.
  • the elastic modulus of the adhesive 3 at 10 Hz or less at 0.1 Hz is 5 ⁇ 10 6 Pa or more, the thermal stress during cooling in the region from 10 ° C. to the lowest temperature is relaxed. Therefore, since the influence of the load on the magnet 1 cannot be ignored, the adhesive must be considered.
  • the adhesive 3 has a modulus of elasticity of 0.1 Hz when compared with a modulus of elasticity of 20 Hz and a modulus of elasticity of 0.1 Hz. Is reduced to 60% or less of the elastic modulus at 20 Hz. This is because thermal stress is generated even before reaching the minimum temperature, and it is important to effectively reduce the elastic modulus and reduce the internal stress on the magnet 1 during cooling even at that stage. is there.
  • the inventors have found out that the load on the magnet side can be reduced if the elastic modulus changes with time over a certain level, and have come to the invention.
  • the elastic modulus of the adhesive agent 3 described the method by the dynamic viscoelasticity in a bulk resin, it is not restricted to this, The measurement of an indentation and the detection of a viscoelasticity are combined with an adhesion part locally. It may be obtained by another method using an apparatus that performs the above.
  • the thickness of the adhesive 3 suitable for the present invention is 30 ⁇ m or more.
  • the thickness is less than 30 ⁇ m, the influence of thermal stress generated inside the magnet 1 is increased, and the magnet 1 may be damaged. Therefore, the soundness of the magnet 1 cannot be ensured. That is, when the adhesive thickness is thinner than 30 ⁇ m, the internal stress becomes 10 MPa or more even if the elastic modulus is within a certain range. In this case, it is considered that the damage accumulated in the magnet 1 increases and the damage is promoted when expansion exceeding 300 ° C. occurs when the magnet 1 is disassembled.
  • the viscosity of the adhesive 3 may be used not only for carbon steel but also for silicon steel plate, so that it does not soak in the meantime and it can be injected by a coating equipment, and if it is about 3000 to 500,000 mPa ⁇ s, it should be used. Can do.
  • an operator may apply the adhesive 3 by hand coating, or a method of discharging the adhesive 3 from the tip of a nozzle may be used.
  • what is discharged from the nozzle may be of any type, such as an air pressure insertion type or a mechanical push-out such as a plunger pump.
  • the thickness of the adhesive 3 may be controlled by appropriately mixing a material that becomes a spacer with the adhesive, or by controlling the viscosity, the coating amount, and the pressure.
  • thermal stress derived from the difference in expansion coefficient is generated as internal stress.
  • a soft adhesive 3 or to secure an adhesive thickness it is usual to use a soft adhesive 3 or to secure an adhesive thickness.
  • it also leads to prevention of the crack of the magnet 1. Thereby, the crack of the magnet 1 can be prevented in a normal usage.
  • the inventors only need to heat and reuse the magnet if it is simply disassembled. However, in order to obtain a magnet that ensures mechanical reliability even in the reused magnet, the internal stress is reduced. If it was not controlled adhesion, it was judged that it was difficult to use the dismantled magnet. Further, when the value was examined in detail in the range of the lowest temperature range in a normal room temperature environment, it was found that the stress generated in the magnet had a clear break before and after the Mises equivalent stress of about 10 MPa.
  • 350 to 450 ° C. is appropriate as a temperature for disassembling the magnet 1.
  • temperature is 350 degrees C or less, it is insufficient as temperature which reduces magnetic force, and takes time too much.
  • the adhesive 3 is thermally oxidized to facilitate disassembly.
  • 450 ° C. or less is desirable.
  • the heat treatment time may be thermal oxidation to such an extent that the magnetic force disappears and the adhesive 3 can be disassembled, and generally it may be in the range of about 1 to 48 hours, and preferably about 2 to 6 hours.
  • a method for calculating the internal stress there is an elastic calculation by a finite element method (FEM).
  • FEM finite element method
  • general-purpose software may be used. For example, ABAQUS (registered trademark), NASTRAN (registered trademark), ANSYS (registered trademark), FEMAP (registered trademark), or the like can be used.
  • the FEM general-purpose calculation software defines the divided elements as the elastic modulus E1 of the magnet 1, the elastic modulus E2 of the iron 2, Poisson's ratio ⁇ , and expansion coefficient ⁇ .
  • the magnet 1 since the magnet 1 has anisotropy, an expansion coefficient is changed with an easy magnetization direction and a difficult magnetization direction.
  • general numerical values are used as the physical property values of the magnet 1 and the iron 2.
  • the calculation itself may be a calculation of the range of the elastic region, and the stress appearing in one divided element is expressed as follows. (1) ... It is defined by strain ⁇ ⁇ elastic modulus E. (2)... Strain ⁇ is defined by the relative positional relationship of each member deformed by the expansion coefficient ⁇ ⁇ temperature change and the elastic deformation of each element.
  • the expansion coefficient ⁇ of the adhesive 3 is within the scope of the present invention and the elastic modulus is 5 ⁇ 10 6 to 5 ⁇ 10 7 Pa, it can be represented by approximately 200 ⁇ 10 ⁇ 6. Use the value. Also, the Poisson ratio ⁇ is 0.48 which is a general value in this range.
  • the upper limit of the thermal stress is not the temperature at which the adhesive 3 is cured but the use of the product to which the magnet adhesive 10 is applied when the curing temperature of the adhesive 3 is lower than the operating temperature of the magnet adhesive 10. Consider the upper limit temperature.
  • the reason for setting in this way is that the adhesive 3 normally hardens due to continuous temperature rise, and the reference temperature of the thermal stress approaches the operating temperature of the product to which the magnet adhesive 10 is applied. Therefore, the upper limit temperature when the thermal stress is calculated when the curing temperature of the adhesive 3 is higher than the use temperature of the magnet bonded body 10 or after the adhesive 3 is cured needs to be set to the curing temperature of the adhesive 3. There is.
  • FIG. 2 is an explanatory diagram showing a comparison between Examples 1 to 5 and Comparative Examples 1 to 4 of the present invention.
  • FIG. 2 shows the bonding area, the thickness of the adhesive, the elastic modulus of the adhesive at the lowest temperature during cooling, and the thermal stress in the magnet during cooling. Moreover, as an evaluation result, the result of having determined whether the magnet is healthy after the test of the magnet itself is shown.
  • Example 1 S45C carbon steel was cut out to 10 ⁇ 40 ⁇ 70 mm to produce soft magnetic body 2. The surface of the soft magnetic body 2 was mechanically polished and then degreased with isopropanol and naturally dried.
  • the Nd—Fe—B rare earth magnet 1 having a size of 25 ⁇ 50 ⁇ 4 mm was bonded.
  • the bonded portion uses a magnet on which aluminum deposition of 20 ⁇ m on average is performed and a zirconium-phosphate-based chemical conversion treatment is performed later.
  • bonding is performed with a bonding thickness of 100 ⁇ m and a bonding area of 25 ⁇ 50 mm.
  • the adhesive 3 was fixed using a one-pack silylated acrylate polymer having a viscosity of 170 Pa ⁇ s.
  • the magnet bonded body 10 thus prepared was fixed at room temperature for 1 week and then heated at 100 ° C. for 10 days to obtain an evaluation body.
  • the load applied to the magnet 1 of the magnet bonded body 10 is calculated under the following conditions.
  • the difference between the maximum use temperature and the minimum temperature of the product is defined as ⁇ T.
  • the elastic modulus of the adhesive 3 when cured under the same conditions as described above is that the storage elastic modulus in the tensile mode at 0.1 Hz of the lowest temperature adhesive is 12 MPa.
  • the Poisson's ratio is 0.48, and the thermal expansion coefficient is 200 ⁇ 10 ⁇ 6 / K.
  • the temperature during cooling was 10 ° C., 0 ° C., ⁇ 10 ° C., ⁇ 20 ° C., They were 0.57, 0.46, 0.35, and 0.29, respectively.
  • the Young's modulus of the magnet 1 is 160 GPa
  • the Poisson's ratio is 0.24
  • the expansion coefficient in the easy magnetization direction is 6.5 ⁇ 10 ⁇ 6 / K
  • the expansion coefficient in the direction perpendicular to the easy magnetization direction is ⁇ 0. .5 ⁇ 10 ⁇ 6 / K.
  • the Young's modulus of the soft magnetic material is 205 GPa
  • the Poisson's ratio is 0.28
  • the thermal expansion coefficient is 12 ⁇ 10 ⁇ 6 / K.
  • the magnet bonded body 10 under such conditions was subjected to a heat cycle of 100 to -20 ° C. 1000 times, but no crack of the magnet 1 was observed. Thereafter, the magnet 1 was demagnetized by putting it in an oven at 400 ° C. for 4 hours, the magnet bonded body 10 was disassembled, and the magnet 1 was recovered. The recovered magnet 1 was cooled to room temperature and then ultrasonically washed with isopropyl alcohol.
  • an iron pin having a diameter of 10 mm is adhered to the center of the magnet 1 with a two-part acrylic adhesive hard lock G55 manufactured by Denki Kagaku Kogyo, and one week at room temperature. After curing, it was fixed by heating at 60 ° C. for 3 hours. Thereafter, the magnet 1 to which the iron pin was bonded was placed on an iron jig having a hole with a diameter of 12 mm shown in FIG. 3, and the strength was measured at a test speed of 2 mm / min.
  • a hole with a diameter of 12 mm is formed in an iron plate having a thickness of 10 mm so that a pin bonded to the magnet can be connected to the strength measuring device. Further, a pin having a diameter of 10 mm is bonded to the magnet with a room temperature curing adhesive. A pin having a diameter of 10 mm can be fixed with a chuck. In this way, the strength can be measured by generating a tensile force between the pin and the magnet.
  • the strength was measured by pulling the pin while holding the magnet at a temperature of 23 ° C., and a magnet that was found to be broken at 10 MPa or less was determined to be insufficient in strength. A total of 50 such evaluations were carried out, but no magnets that failed at 10 MPa or less appeared, and a magnet capable of ensuring strength reliability could be obtained.
  • Example 2 In Example 2, the S45C carbon steel was cut into 10 ⁇ 40 ⁇ 70 mm to produce the soft magnetic body 2. The surface of the soft magnetic body 2 was mechanically polished and then degreased with isopropanol and naturally dried.
  • the Nd—Fe—B rare earth magnet 1 having a size of 25 ⁇ 50 ⁇ 4 mm was bonded.
  • the bonded portion uses a magnet on which aluminum deposition of 20 ⁇ m on average is performed and a zirconium-phosphate-based chemical conversion treatment is performed later.
  • the bonding thickness is set to 65 ⁇ m and the bonding area is set to 25 ⁇ 50 mm.
  • the adhesive 3 was fixed using a two-component mixed modified silicone adhesive having a viscosity of 50 Pa ⁇ s.
  • the magnet bonded body 10 thus prepared was fixed at room temperature for 1 week and then heated at 100 ° C. for 10 days to obtain an evaluation body.
  • the load applied to the magnet 1 of the magnet bonded body 10 is calculated under the following conditions.
  • the difference between the maximum use temperature and the minimum temperature of the product is defined as ⁇ T.
  • the elastic modulus of the adhesive 3 when cured under the same conditions as described above is 6 MPa in the tensile mode storage elastic modulus at 0.1 Hz of the lowest temperature adhesive.
  • the Poisson's ratio is 0.48, and the thermal expansion coefficient is 200 ⁇ 10 ⁇ 6 / K.
  • the temperature during cooling was 10 ° C., 0 ° C., ⁇ 10 ° C., ⁇ 20 ° C., They were 0.52, 0.43, 0.39, and 0.30, respectively.
  • the Young's modulus of the magnet 1 is 160 GPa
  • the Poisson's ratio is 0.24
  • the expansion coefficient in the easy magnetization direction is 6.5 ⁇ 10 ⁇ 6 / K
  • the expansion coefficient in the direction perpendicular to the easy magnetization direction is ⁇ 0. .5 ⁇ 10 ⁇ 6 / K.
  • the Young's modulus of the soft magnetic material is 205 GPa
  • the Poisson's ratio is 0.28
  • the thermal expansion coefficient is 12 ⁇ 10 ⁇ 6 / K.
  • the magnet bonded body 10 under such conditions was subjected to a heat cycle of 100 to -20 ° C. 1000 times, but no crack of the magnet 1 was observed. Thereafter, the magnet 1 was demagnetized by putting it in an oven at 400 ° C. for 4 hours, the magnet bonded body 10 was disassembled, and the magnet 1 was recovered. The recovered magnet 1 was cooled to room temperature and then ultrasonically washed with isopropyl alcohol.
  • an iron pin having a diameter of 10 mm is adhered to the center of the magnet 1 with a two-part acrylic adhesive hard lock G55 manufactured by Denki Kagaku Kogyo, and one week at room temperature. After curing, it was fixed by heating at 60 ° C. for 3 hours. Thereafter, the magnet 1 to which the iron pin was bonded was placed on an iron jig having a hole with a diameter of 12 mm shown in FIG. 3, and the strength was measured at a test speed of 2 mm / min.
  • the strength was measured by pulling the pin while holding the magnet at a temperature of 23 ° C., and a magnet that was found to be broken at 10 MPa or less was determined to be insufficient in strength. A total of 50 such evaluations were carried out, but no magnets that failed at 10 MPa or less appeared, and a magnet capable of ensuring strength reliability could be obtained.
  • Example 3 FIG. In Example 3, S45C carbon steel was cut to 10 ⁇ 40 ⁇ 70 mm to produce soft magnetic body 2. The surface of the soft magnetic body 2 was mechanically polished and then degreased with isopropanol and naturally dried.
  • the Nd—Fe—B rare earth magnet 1 having a size of 25 ⁇ 50 ⁇ 4 mm was bonded.
  • the bonded portion uses a magnet on which aluminum deposition of 20 ⁇ m on average is performed and a zirconium-phosphate-based chemical conversion treatment is performed later.
  • the adhesive thickness is 250 ⁇ m and the adhesive area is 25 ⁇ 50 mm.
  • the adhesive 3 was fixed using a two-component mixed epoxy resin-modified silicone adhesive having a viscosity of 26 Pa ⁇ s.
  • the magnet bonded body 10 thus prepared was fixed at room temperature for 1 week and then heated at 100 ° C. for 10 days to obtain an evaluation body.
  • the load applied to the magnet 1 of the magnet bonded body 10 is calculated under the following conditions.
  • the difference between the maximum use temperature and the minimum temperature of the product is defined as ⁇ T.
  • the elastic modulus of the adhesive 3 when cured under the same conditions as described above is that the storage elastic modulus in the tensile mode at 0.1 Hz of the adhesive at the lowest temperature is 30 MPa.
  • the Poisson's ratio is 0.48, and the thermal expansion coefficient is 200 ⁇ 10 ⁇ 6 / K.
  • the temperature during cooling was 10 ° C., 0 ° C., ⁇ 10 ° C., ⁇ 20 ° C., ⁇ At 30 ° C., they were 0.50, 0.41, 0.33, 0.28, and 0.23, respectively.
  • the Young's modulus of the magnet 1 is 160 GPa
  • the Poisson's ratio is 0.24
  • the expansion coefficient in the easy magnetization direction is 6.5 ⁇ 10 ⁇ 6 / K
  • the expansion coefficient in the direction perpendicular to the easy magnetization direction is ⁇ 0. .5 ⁇ 10 ⁇ 6 / K.
  • the Young's modulus of the soft magnetic material is 205 GPa
  • the Poisson's ratio is 0.28
  • the thermal expansion coefficient is 12 ⁇ 10 ⁇ 6 / K.
  • the magnet bonded body 10 under such conditions was subjected to a heat cycle of 120 to -30 ° C. 1000 times, but no crack of the magnet 1 was observed. Thereafter, the magnet 1 was demagnetized by putting it in an oven at 400 ° C. for 4 hours, the magnet bonded body 10 was disassembled, and the magnet 1 was recovered. The recovered magnet 1 was cooled to room temperature and then ultrasonically washed with isopropyl alcohol.
  • an iron pin having a diameter of 10 mm is adhered to the center of the magnet 1 with a two-part acrylic adhesive hard lock G55 manufactured by Denki Kagaku Kogyo, and one week at room temperature. After curing, it was fixed by heating at 60 ° C. for 3 hours. Thereafter, the magnet 1 to which the iron pin was bonded was placed on an iron jig having a hole with a diameter of 12 mm shown in FIG. 3, and the strength was measured at a test speed of 2 mm / min.
  • the strength was measured by pulling the pin while holding the magnet at a temperature of 23 ° C., and a magnet that was found to be broken at 10 MPa or less was determined to be insufficient in strength. A total of 50 such evaluations were carried out, but no magnets that failed at 10 MPa or less appeared, and a magnet capable of ensuring strength reliability could be obtained.
  • Example 4 S45C carbon steel was cut to 10 ⁇ 40 ⁇ 70 mm to produce soft magnetic body 2. The surface of the soft magnetic body 2 was mechanically polished and then degreased with isopropanol and naturally dried.
  • the Nd—Fe—B rare earth magnet 1 having a size of 15 ⁇ 30 ⁇ 3.5 mm was bonded.
  • the bonded portion uses a magnet on which aluminum deposition of 20 ⁇ m on average is performed and a zirconium-phosphate-based chemical conversion treatment is performed later.
  • the bonding thickness is 50 ⁇ m and the bonding area is 15 ⁇ 30 mm.
  • the adhesive 3 was fixed using a modified silicone adhesive having a viscosity of 50 Pa ⁇ s.
  • the magnet bonded body 10 thus prepared was fixed at room temperature for 1 week and then heated at 100 ° C. for 10 days to obtain an evaluation body.
  • the load applied to the magnet 1 of the magnet bonded body 10 is calculated under the following conditions.
  • the difference between the maximum use temperature and the minimum temperature of the product is defined as ⁇ T.
  • the elastic modulus of the adhesive 3 when cured under the same conditions as described above is 6 MPa in the tensile mode storage elastic modulus at 0.1 Hz of the lowest temperature adhesive.
  • the Poisson's ratio is 0.48, and the thermal expansion coefficient is 200 ⁇ 10 ⁇ 6 / K.
  • the temperature during cooling was 10 ° C., 0 ° C., ⁇ 10 ° C., ⁇ 20 ° C., They were 0.52, 0.43, 0.39, and 0.30, respectively.
  • the Young's modulus of the magnet 1 is 160 GPa
  • the Poisson's ratio is 0.24
  • the expansion coefficient in the easy magnetization direction is 6.5 ⁇ 10 ⁇ 6 / K
  • the expansion coefficient in the direction perpendicular to the easy magnetization direction is ⁇ 0. .5 ⁇ 10 ⁇ 6 / K.
  • the Young's modulus of the soft magnetic material is 205 GPa
  • the Poisson's ratio is 0.28
  • the thermal expansion coefficient is 12 ⁇ 10 ⁇ 6 / K.
  • the magnet bonded body 10 under such conditions was subjected to a heat cycle of 100 to -20 ° C. 1000 times, but no crack of the magnet 1 was observed. Thereafter, the magnet 1 was demagnetized by putting it in an oven at 400 ° C. for 4 hours, the magnet bonded body 10 was disassembled, and the magnet 1 was recovered. The recovered magnet 1 was cooled to room temperature and then ultrasonically washed with isopropyl alcohol.
  • an iron pin having a diameter of 10 mm is adhered to the center of the magnet 1 with a two-part acrylic adhesive hard lock G55 manufactured by Denki Kagaku Kogyo, and one week at room temperature. After curing, it was fixed by heating at 60 ° C. for 3 hours. Thereafter, the magnet 1 to which the iron pin was bonded was placed on an iron jig having a hole with a diameter of 12 mm shown in FIG. 3, and the strength was measured at a test speed of 2 mm / min.
  • the strength was measured by pulling the pin while holding the magnet at a temperature of 23 ° C., and a magnet that was found to be broken at 10 MPa or less was determined to be insufficient in strength. A total of 50 such evaluations were carried out, but no magnets that failed at 10 MPa or less appeared, and a magnet capable of ensuring strength reliability could be obtained.
  • Embodiment 5 FIG. In Example 5, S45C carbon steel was cut into 10 ⁇ 40 ⁇ 70 mm to produce soft magnetic body 2. The surface of the soft magnetic body 2 was mechanically polished and then degreased with isopropanol and naturally dried.
  • the bonding thickness is 30 ⁇ m and the bonding area is 15 ⁇ 30 mm.
  • the adhesive 3 was fixed using a two-component modified silicone adhesive having a viscosity of 10 Pa ⁇ s.
  • the magnet bonded body 10 thus prepared was fixed at room temperature for 1 week and then heated at 100 ° C. for 10 days to obtain an evaluation body.
  • the load applied to the magnet 1 of the magnet bonded body 10 is calculated under the following conditions.
  • the difference between the maximum use temperature and the minimum temperature of the product is defined as ⁇ T.
  • the elastic modulus of the adhesive 3 when cured under the same conditions as described above is 3 MPa for the tensile mode storage elastic modulus at 0.1 Hz of the lowest temperature adhesive.
  • the Poisson's ratio is 0.48, and the thermal expansion coefficient is 200 ⁇ 10 ⁇ 6 / K.
  • the temperature during cooling was 10 ° C., 0 ° C., ⁇ 10 ° C., ⁇ 20 ° C., They were 0.58, 0.50, 0.43, and 0.35, respectively.
  • the Young's modulus of the magnet 1 is 160 GPa
  • the Poisson's ratio is 0.24
  • the expansion coefficient in the easy magnetization direction is 6.5 ⁇ 10 ⁇ 6 / K
  • the expansion coefficient in the direction perpendicular to the easy magnetization direction is ⁇ 0. .5 ⁇ 10 ⁇ 6 / K.
  • the Young's modulus of the soft magnetic material is 205 GPa
  • the Poisson's ratio is 0.28
  • the thermal expansion coefficient is 12 ⁇ 10 ⁇ 6 / K.
  • the magnet bonded body 10 under such conditions was subjected to a heat cycle of 100 to -20 ° C. 1000 times, but no crack of the magnet 1 was observed. Thereafter, the magnet 1 was demagnetized by putting it in an oven at 400 ° C. for 4 hours, the magnet bonded body 10 was disassembled, and the magnet 1 was recovered. The recovered magnet 1 was cooled to room temperature and then ultrasonically washed with isopropyl alcohol.
  • an iron pin having a diameter of 10 mm is adhered to the center of the magnet 1 with a two-part acrylic adhesive hard lock G55 manufactured by Denki Kagaku Kogyo, and one week at room temperature. After curing, it was fixed by heating at 60 ° C. for 3 hours. Thereafter, the magnet 1 to which the iron pin was bonded was placed on an iron jig having a hole with a diameter of 12 mm shown in FIG. 3, and the strength was measured at a test speed of 2 mm / min.
  • the strength was measured by pulling the pin while holding the magnet at a temperature of 23 ° C., and a magnet that was found to be broken at 10 MPa or less was determined to be insufficient in strength. A total of 50 such evaluations were carried out, but no magnets that failed at 10 MPa or less appeared, and a magnet capable of ensuring strength reliability could be obtained.
  • FIG. 4 is a cross-sectional view showing a configuration when the magnet bonded body according to Embodiment 1 of the present invention is applied to a rotor of a motor.
  • this rotor for motors is integrated in the motor of an elevator hoisting machine, for example.
  • the motor rotor includes a cylindrical soft magnetic body 2 and a plurality of soft magnetic bodies 2 arranged on the outer circumferential surface of the soft magnetic body 2 in the axial direction and at predetermined intervals in the circumferential direction. Magnet 1 and an adhesive 3 for adhering the magnet 1 to a soft magnetic body 2.
  • the magnet 1 is, for example, a rare earth magnet having an aluminum vapor deposition film.
  • a rare earth magnet (shape: 25 ⁇ 50 ⁇ outer diameter 32 mm) having this aluminum vapor-deposited film was bonded to the cylindrical iron yoke with a 30-pole configuration using the adhesive of Example 1.
  • the rotor having this configuration could be used as a motor.
  • the rotor was removed and heated at 400 ° C. for 4 hours to demagnetize and separate the magnet. Thereafter, the magnets were evaluated in the same manner as in Example 1, and it was found that all the magnets exhibited a strength of 10 MPa or more and the soundness of the strength could be secured.
  • FIG. 5 is a cross-sectional view showing a configuration when the magnet bonded body according to Embodiment 1 of the present invention is applied to an actuator.
  • a rare earth magnet 1 (a shape: 13 ⁇ 45 ⁇ 75 mm) having an aluminum vapor-deposited film was bonded to an iron yoke, which is a soft magnetic body 2 subjected to electroless plating with a two-pole configuration.
  • the adhesive area is 40 ⁇ 75 mm
  • the adhesive 3 is a coil in which a copper wire is wound around the magnetic circuit and the aluminum bobbin 4 using the adhesive of Example 2 with an adhesive thickness of 220 ⁇ m. 5 was used to make an actuator. This could be used as an actuator.
  • the magnet was demagnetized and separated by heating at 400 ° C. for 4 hours. Thereafter, the magnets were evaluated in the same manner as in Example 1, and it was found that all the magnets exhibited a strength of 10 MPa or more and the soundness of the strength could be secured. Specifically, 30 recovered magnets were evaluated, and all showed strength of 10 MPa or more, and it was found that the soundness of strength could be secured.
  • Comparative Example 1 In Comparative Example 1, S45C carbon steel was cut out to 10 ⁇ 40 ⁇ 70 mm to produce a soft magnetic body 2. The surface of the soft magnetic body 2 was mechanically polished and then degreased with isopropanol and naturally dried.
  • the Nd—Fe—B rare earth magnet 1 having a size of 15 ⁇ 30 ⁇ 3.5 mm was bonded.
  • the bonded portion uses a magnet on which aluminum deposition of 20 ⁇ m on average is performed and a zirconium-phosphate-based chemical conversion treatment is performed later.
  • the bonding thickness is 20 ⁇ m and the bonding area is 15 ⁇ 30 mm.
  • the adhesive 3 was fixed using a two-component modified silicone adhesive having a viscosity of 26 Pa ⁇ s.
  • the magnet bonded body 10 thus prepared was fixed at room temperature for 1 week and then heated at 100 ° C. for 10 days to obtain an evaluation body.
  • the load applied to the magnet 1 of the magnet bonded body 10 is calculated under the following conditions.
  • the difference between the maximum use temperature and the minimum temperature of the product is defined as ⁇ T.
  • the elastic modulus of the adhesive 3 when cured under the same conditions as described above is 6 MPa in the tensile mode storage elastic modulus at 0.1 Hz of the lowest temperature adhesive.
  • the Poisson's ratio is 0.48, and the thermal expansion coefficient is 200 ⁇ 10 ⁇ 6 / K.
  • the temperature during cooling was 10 ° C., 0 ° C., ⁇ 10 ° C., ⁇ 20 ° C., They were 0.52, 0.43, 0.39, and 0.30, respectively.
  • the Young's modulus of the magnet 1 is 160 GPa
  • the Poisson's ratio is 0.24
  • the expansion coefficient in the easy magnetization direction is 6.5 ⁇ 10 ⁇ 6 / K
  • the expansion coefficient in the direction perpendicular to the easy magnetization direction is ⁇ 0. .5 ⁇ 10 ⁇ 6 / K.
  • the Young's modulus of the soft magnetic material is 205 GPa
  • the Poisson's ratio is 0.28
  • the thermal expansion coefficient is 12 ⁇ 10 ⁇ 6 / K.
  • the magnet bonded body 10 under such conditions was subjected to a heat cycle of 100 to -20 ° C. 1000 times, but no crack of the magnet 1 was observed. Thereafter, the magnet 1 was demagnetized by putting it in an oven at 400 ° C. for 4 hours, the magnet bonded body 10 was disassembled, and the magnet 1 was recovered. The recovered magnet 1 was cooled to room temperature and then ultrasonically washed with isopropyl alcohol.
  • an iron pin having a diameter of 10 mm is adhered to the center of the magnet 1 with a two-part acrylic adhesive hard lock G55 manufactured by Denki Kagaku Kogyo, and one week at room temperature. After curing, it was fixed by heating at 60 ° C. for 3 hours. Thereafter, the magnet 1 to which the iron pin was bonded was placed on an iron jig having a hole with a diameter of 12 mm shown in FIG. 3, and the strength was measured at a test speed of 2 mm / min.
  • the strength was measured by pulling the pin while holding the magnet at a temperature of 23 ° C., and a magnet that was found to be broken at 10 MPa or less was determined to be insufficient in strength. When a total of 50 such evaluations were performed, two magnets that were damaged at 10 MPa or less were confirmed.
  • Comparative Example 2 In Comparative Example 2, the S45C carbon steel was cut into 10 ⁇ 40 ⁇ 70 mm to produce the soft magnetic body 2. The surface of the soft magnetic body 2 was mechanically polished and then degreased with isopropanol and naturally dried.
  • the Nd—Fe—B rare earth magnet 1 having a size of 25 ⁇ 50 ⁇ 4 mm was bonded.
  • the bonded portion uses a magnet on which aluminum deposition of 20 ⁇ m on average is performed and a zirconium-phosphate-based chemical conversion treatment is performed later.
  • the bonding thickness is 30 ⁇ m and the bonding area is 15 ⁇ 30 mm.
  • the adhesive 3 was fixed using a two-component modified silicone adhesive having a viscosity of 26 Pa ⁇ s.
  • the magnet bonded body 10 thus prepared was fixed at room temperature for 1 week and then heated at 100 ° C. for 10 days to obtain an evaluation body.
  • the load applied to the magnet 1 of the magnet bonded body 10 is calculated under the following conditions.
  • the difference between the maximum use temperature and the minimum temperature of the product is defined as ⁇ T.
  • the elastic modulus of the adhesive 3 when cured under the same conditions as described above is that the storage elastic modulus in the tensile mode at 0.1 Hz of the adhesive at the lowest temperature is 30 MPa.
  • the Poisson's ratio is 0.48, and the thermal expansion coefficient is 200 ⁇ 10 ⁇ 6 / K.
  • the temperature during cooling was 10 ° C., 0 ° C., ⁇ 10 ° C., ⁇ 20 ° C., They were 0.5, 0.41, 0.33, and 0.28, respectively.
  • the Young's modulus of the magnet 1 is 160 GPa
  • the Poisson's ratio is 0.24
  • the expansion coefficient in the easy magnetization direction is 6.5 ⁇ 10 ⁇ 6 / K
  • the expansion coefficient in the direction perpendicular to the easy magnetization direction is ⁇ 0. .5 ⁇ 10 ⁇ 6 / K.
  • the Young's modulus of the soft magnetic material is 205 GPa
  • the Poisson's ratio is 0.28
  • the thermal expansion coefficient is 12 ⁇ 10 ⁇ 6 / K.
  • the magnet bonded body 10 under such conditions was subjected to a heat cycle of 100 to -20 ° C. 1000 times, but no crack of the magnet 1 was observed. Thereafter, the magnet 1 was demagnetized by putting it in an oven at 400 ° C. for 4 hours, the magnet bonded body 10 was disassembled, and the magnet 1 was recovered. The recovered magnet 1 was cooled to room temperature and then ultrasonically washed with isopropyl alcohol.
  • an iron pin having a diameter of 10 mm is adhered to the center of the magnet 1 with a two-part acrylic adhesive hard lock G55 manufactured by Denki Kagaku Kogyo, and one week at room temperature. After curing, it was fixed by heating at 60 ° C. for 3 hours. Thereafter, the magnet 1 to which the iron pin was bonded was placed on an iron jig having a hole with a diameter of 12 mm shown in FIG. 3, and the strength was measured at a test speed of 2 mm / min.
  • the strength was measured by pulling the pin while holding the magnet at a temperature of 23 ° C., and a magnet that was found to be broken at 10 MPa or less was determined to be insufficient in strength. When 50 such evaluations were carried out in total, 8 magnets that were damaged at 10 MPa or less were confirmed.
  • Comparative Example 3 In Comparative Example 3, the S45C carbon steel was cut to 10 ⁇ 40 ⁇ 70 mm to produce the soft magnetic body 2. The surface of the soft magnetic body 2 was mechanically polished and then degreased with isopropanol and naturally dried.
  • the Nd—Fe—B rare earth magnet 1 having a size of 25 ⁇ 50 ⁇ 4 mm was bonded.
  • the bonded portion uses a magnet on which aluminum deposition of 20 ⁇ m on average is performed and a zirconium-phosphate-based chemical conversion treatment is performed later.
  • the bonding thickness is 50 ⁇ m and the bonding area is 25 ⁇ 50 mm.
  • the adhesive 3 was fixed using a one-pack type silicone adhesive having a viscosity of 60 Pa ⁇ s.
  • the magnet bonded body 10 thus prepared was cured by heating at 120 ° C. for 2 hours, and then heated at 120 ° C. for 10 days to obtain an evaluation body.
  • the load applied to the magnet 1 of the magnet bonded body 10 is calculated under the following conditions.
  • the difference between the maximum use temperature and the minimum temperature of the product is defined as ⁇ T.
  • the elastic modulus of the adhesive 3 when cured under the same conditions as described above is 3 MPa for the tensile mode storage elastic modulus at 0.1 Hz of the lowest temperature adhesive.
  • the Poisson's ratio is 0.48, and the thermal expansion coefficient is 200 ⁇ 10 ⁇ 6 / K.
  • the temperature during cooling was 10 ° C., 0 ° C., ⁇ 10 ° C., ⁇ 20 ° C., They were 0.74, 0.72, 0.70, and 0.65, respectively.
  • the Young's modulus of the magnet 1 is 160 GPa
  • the Poisson's ratio is 0.24
  • the expansion coefficient in the easy magnetization direction is 6.5 ⁇ 10 ⁇ 6 / K
  • the expansion coefficient in the direction perpendicular to the easy magnetization direction is ⁇ 0. .5 ⁇ 10 ⁇ 6 / K.
  • the Young's modulus of the soft magnetic material is 205 GPa
  • the Poisson's ratio is 0.28
  • the thermal expansion coefficient is 12 ⁇ 10 ⁇ 6 / K.
  • the magnet bonded body 10 under such conditions was subjected to a heat cycle of 120 to -20 ° C. 1000 times, but no cracks in the magnet 1 were observed. Thereafter, the magnet 1 was demagnetized by putting it in an oven at 400 ° C. for 4 hours, the magnet bonded body 10 was disassembled, and the magnet 1 was recovered. The recovered magnet 1 was cooled to room temperature and then ultrasonically washed with isopropyl alcohol.
  • an iron pin having a diameter of 10 mm is adhered to the center of the magnet 1 with a two-part acrylic adhesive hard lock G55 manufactured by Denki Kagaku Kogyo, and one week at room temperature. After curing, it was fixed by heating at 60 ° C. for 3 hours. Thereafter, the magnet 1 to which the iron pin was bonded was placed on an iron jig having a hole with a diameter of 12 mm shown in FIG. 3, and the strength was measured at a test speed of 2 mm / min.
  • the strength was measured by pulling the pin while holding the magnet at a temperature of 23 ° C., and a magnet that was found to be broken at 10 MPa or less was determined to be insufficient in strength. When 50 such evaluations were carried out in total, 30 magnets that were damaged at 10 MPa or less were confirmed.
  • Comparative Example 4 In Comparative Example 4, the magnet 1 and the soft magnetic body 2 having the same configuration as that of the above-described Example 1 were used. Here, only the adhesive 3 was a one-component modified silicone adhesive that exhibited the following performance.
  • the difference between the maximum use temperature and the minimum temperature of the product is defined as ⁇ T.
  • the elastic modulus of the adhesive 3 when cured under the same conditions as described above is 15 MPa for the tensile mode storage elastic modulus at 0.1 Hz of the lowest temperature adhesive.
  • the Poisson's ratio is 0.48, and the thermal expansion coefficient is 200 ⁇ 10 ⁇ 6 / K.
  • the temperature during cooling was 10 ° C., 0 ° C., ⁇ 10 ° C., ⁇ 20 ° C., ⁇ At 30 ° C., they were 0.75, 0.61, 0.52, 0.44, and 0.41, respectively.
  • FIG. 6 is an explanatory diagram showing the relationship between the thermal stress in the magnet during cooling and the number of failures in Examples 1 to 5 and Comparative Examples 1 to 2 and 4 of the present invention.
  • the comparative example 3 with large contamination with silicone shown in FIG. 2 is excluded.
  • FIG. 6 shows that there is a clear difference in the generation of rejected products between the stress region of 10 MPa or more and the stress region of less than 10 MPa.
  • Example 2 and Comparative Example 4 although the calculated in-magnet thermal stress itself is equivalent to 8.8 MPa and 8.5 MPa, respectively, a case where a rejected product occurs and a case where it does not occur Exists.
  • the index can be found from the viscoelastic characteristics of the resin, and by using the appropriate material by comparing the difference between the frequencies 20 Hz and 0.1 Hz, it is possible to avoid the breakage of the magnet. I found out that I can do it.
  • the internal stress applied to the magnet 1 is less than 10 MPa.
  • the elastic modulus at the time of cooling of the adhesive 3 used in the present invention is 5 ⁇ 10 6 to 5 at a frequency of 0.1 Hz in the region where the minimum operating temperature is 10 ° C. or less.
  • the elastic modulus of 0.1 Hz is an elastic modulus of 20 Hz. It is 60% or less, the thickness of the adhesive 3 is 30 ⁇ m or more, and the internal stress applied to the magnet 1 is all below 10 MPa.
  • the adhesion thickness is 30 ⁇ m or more.
  • the adhesive elastic modulus at the lowest temperature is 6 MPa and the adhesion area is 450 mm 2.
  • the adhesion thickness is 20 ⁇ m, the thermal stress generated inside the magnet 1 is The effect is particularly large when the values are different.
  • the adhesive thickness is thin, the influence becomes large. Further, if the elastic modulus of the adhesive 3 is not less than a certain value, the magnet 1 is damaged.
  • Comparative Example 2 is a combination in which the thermal stress determined by the elastic modulus of the adhesive 3 becomes large, although a constant adhesive thickness of 30 ⁇ m can be secured. Furthermore, the soundness of the magnet 1 cannot be ensured.
  • Comparative Example 3 the internal stress applied to the magnet 1 is less than 10 MPa, but the strength cannot be ensured at the time of strength evaluation during reuse. That is, since the comparative example 3 uses the flexible resin which has a silicone molecule as a main component, the component which affects the adhesiveness at the time of disassembly adheres in large quantities. Here, the present invention cannot be achieved unless such deposits are generated.
  • the internal stress is 10 MPa or more even if the elastic modulus is within a certain range.
  • the damage accumulated in the magnet 1 increases and the damage is promoted when expansion exceeding 300 ° C. occurs when the magnet 1 is disassembled.
  • Comparative Example 4 the same adhesive thickness as in Example 1 and the internal stress of the magnet 1 itself are not so large as 10 MPa or less, but the storage elastic modulus of the adhesive of 0.1 Hz and 20 Hz during cooling at 10 ° C. or less is low. Since the ratio is larger than 0.6 and the relaxation performance is low, it is considered that the accumulation of damage at that time was apparent.
  • the magnet bonded body according to the present invention is a magnet bonded body of a rare earth magnet and a soft magnetic body fixed with a non-silicone adhesive, and the elastic modulus of the adhesive is the thermal stress in the lowest temperature range. Designed to be 10 MPa or less when converted to equivalent stress, it is dismantled and reused by thermal oxidation in the range of 350 to 450 ° C. during magnet recycling. In addition, the lower limit of the thermal stress in the lowest temperature range converted by Mises equivalent stress is 0.1 MPa. In fixing by adhesion, curing shrinkage occurs, and it is estimated that such internal stress is generated.
  • the magnet is securely bonded to the soft magnetic body.
  • This is an excellent structure against magnet cracking during heat cycle resistance from the viewpoint of the expansion coefficient.
  • the magnet is not only excellent in the load due to the heat cycle, but is also characterized in that the magnet is hardly cracked even in a heating load in the atmosphere of 300 ° C. or higher at the time of reuse. Therefore, it can be used while ensuring a certain material reliability even when the magnet is reused.
  • the adhesive has an elastic modulus of 5 ⁇ 10 6 to 5 ⁇ 10 7 Pa at a frequency of 0.1 Hz in a region where the lowest use temperature is 10 ° C. or lower during cooling.
  • the elastic modulus at 0.1 Hz is 60% or less of the elastic modulus at 20 Hz.
  • the thickness is 30 ⁇ m or more, and the thermal stress generated inside the magnet by adhesion is 10 MPa or less in terms of Mises equivalent stress.
  • the rare earth magnet was bonded to the soft magnetic material and the load due to the heat cycle was applied for a long time and then disassembled by heating, the material strength was ensured without dissolving the obtained rare earth magnet. It can be reused as it is.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Hard Magnetic Materials (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

L'invention concerne un élément adhésif d'aimant qui comprend un aimant en terre rare collé à un matériau magnétique doux et qui peut être réutilisé tout en garantissant la solidité du matériau sans qu'il soit nécessaire de dissoudre l'aimant en terre rare qui en résulte, par exemple, même si l'élément s'est rompu suite à un chauffage, après avoir été soumis à une charge cyclique thermique pendant une longue période. L'élément adhésif d'aimant comprend un aimant au Nd-Fe-B et un matériau magnétique doux qui sont collés à l'aide d'un adhésif. L'adhésif comprend un composant principal autre que du silicone avec un module d'élasticité de 5 × 106 à 5 × 107 Pa à une fréquence de 0,1 Hz dans une région de température d'utilisation minimale de 10 °C ou moins lorsqu'il est refroidi, et il est tel que, lors d'une comparaison des modules d'élasticité dynamique à des fréquences de 20 Hz et de 0,1 Hz, le module d'élasticité à 0,1 Hz n'est pas supérieur de plus de 60 % du module d'élasticité à 20 Hz, l'adhésif ayant une épaisseur minimale de 30 μm, et une contrainte thermique produite dans l'aimant par l'adhésion n'étant pas supérieure à 10 MPa en termes de contrainte équivalent de Von Mises.
PCT/JP2015/072358 2015-01-30 2015-08-06 Élément adhésif d'aimant WO2016121149A1 (fr)

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JP7186010B2 (ja) * 2018-04-16 2022-12-08 日本電産サンキョー株式会社 アクチュエータの製造方法
US20210286276A1 (en) 2018-07-31 2021-09-16 Kyocera Document Solutions Inc. Image forming apparatus and image forming method
US11640120B2 (en) 2018-07-31 2023-05-02 Kyocera Document Solutions Inc. Image forming apparatus and image forming method
US10923261B2 (en) 2018-10-30 2021-02-16 Microsoft Technology Licensing, Llc Magnetic fastening assembly
KR102607691B1 (ko) * 2018-12-17 2023-11-30 닛폰세이테츠 가부시키가이샤 스테이터용 접착 적층 코어 및 회전 전기 기계
CN109873513A (zh) * 2019-04-01 2019-06-11 哈尔滨理工大学 耐低温高速永磁电机高强度转子结构

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JP2010239792A (ja) * 2009-03-31 2010-10-21 Hitachi Metals Ltd コア部材とリング状希土類系永久磁石を接着固定してなる接着体の製造方法
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JPH06237565A (ja) * 1993-02-09 1994-08-23 Hitachi Metals Ltd 可動コイル型アクチュエータ
WO2004077641A1 (fr) * 2003-02-27 2004-09-10 Mitsubishi Denki Kabushiki Kaisha Rotor a aimant pour moteur
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