WO2006022101A1 - 自己組織化した網目状境界相を有する異方性希土類ボンド磁石とそれを用いた永久磁石型モータ - Google Patents
自己組織化した網目状境界相を有する異方性希土類ボンド磁石とそれを用いた永久磁石型モータ Download PDFInfo
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- WO2006022101A1 WO2006022101A1 PCT/JP2005/013479 JP2005013479W WO2006022101A1 WO 2006022101 A1 WO2006022101 A1 WO 2006022101A1 JP 2005013479 W JP2005013479 W JP 2005013479W WO 2006022101 A1 WO2006022101 A1 WO 2006022101A1
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- rare earth
- boundary phase
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- bonded magnet
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0578—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together bonded together
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/059—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and Va elements, e.g. Sm2Fe17N2
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- 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
- H01F41/02—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 for manufacturing cores, coils, or magnets
- H01F41/0253—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 for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0273—Imparting anisotropy
Definitions
- the present invention relates to an anisotropic rare earth bonded magnet having a self-organized network boundary phase mounted on a permanent magnet type motor used for driving electric and electronic equipment.
- rare earth sintered magnets with a maximum energy product (MEP) of 216 to 296 kjZm 3 are relatively large motors, such as MRI, VCM, FA, and EV, with machine outputs ranging from several hundred watts to several tens of kW. Widely popular.
- a small-diameter annular isotropic rare earth bonded magnet with a MEP of 72kjZm 3 or less in which a RE-TM-B quenching magnet powder obtained by pulverizing a melt-spun ribbon is fixed with a resin, is a permanent magnet type small motor. Is used. There has been no significant progress in increasing the MEP of isotropic rare-earth bonded magnets produced by pulverizing melt-spun ribbons. Regardless of the above, with the background of demand for higher performance and higher added value in electrical and electronic equipment, there is a constant demand for further downsizing and weight reduction of permanent magnet motors and higher output.
- anisotropic bonded magnets have been actively developed.
- An anisotropic rare-earth bonded magnet with a MEP of 150 kjZm 3 has also been obtained.
- anisotropic rare earth magnet powders with a coercive force H of 1.20 MAZm or more, which are expected to have thermal stability were also developed.
- the rare earth bond magnets with high MEP using anisotropic rare earth magnet powders described above are prototypes made of cylinders or cubes, and are actually rarely used in general small motors.
- the magnet mounted on the small motor targeted by the present invention is not a simple cylinder or cube, but is a ring-shaped or arc-shaped force having a small diameter of, for example, lmm or less.
- a radially anisotropic rare earth bonded magnet that is magnetically anisotropic in the radial direction is required.
- Such a radial orientation magnetic field The means for generating is described in JP-A-57-170501.
- a molding die in which a magnetic yoke and a non-magnetic yoke are alternately combined and an excitation coil is disposed on the outer side, surrounding the annular molding cavity.
- This method requires a large magnetomotive force in order to generate a radial magnetic field having a predetermined strength in the annular mold cavity.
- it is necessary to lengthen the magnetic path of the magnetic yoke in order to effectively focus the magnetic flux excited by the magnetic coil from the outer periphery of the annular mold cavity on the annular mold cavity.
- the annular mold cavity has a small diameter (or long length)
- a proportion of the magnetomotive force is consumed as leakage flux.
- the orientation magnetic field of the annular mold cavity is reduced, and unlike the rare-earth bonded magnets with high MEPs that were prototyped with cylinders or cubes, the ring-shaped or arc-shaped rare-earth bonded magnets with actually reduced MEP There is a problem that can not be.
- the present invention provides
- an anisotropic rare earth bonded magnet having a self-organized network boundary phase that chemically bonds with a polymer at a chemical contact point.
- the present invention provides a permanent magnet motor equipped with the anisotropic rare earth bonded magnet having the self-organized network boundary phase.
- FIG. 1A is an explanatory diagram of an anisotropic bonded magnet according to an embodiment of the present invention.
- FIG. 1B is an explanatory diagram of an anisotropic bonded magnet according to an embodiment of the present invention.
- FIG. 1C is an explanatory diagram of an anisotropic bonded magnet according to an embodiment of the present invention.
- FIG. 2 is a view for explaining an example of the chemical structure of the anisotropic bonded magnet according to the embodiment of the present invention.
- FIG. 3 is a view showing the pressure dependence of the relative density of the anisotropic bonded magnet according to the embodiment of the present invention.
- Fig. 4 is a diagram showing the relationship between the diameter and thickness of the disk elongation of the anisotropic bonded magnet according to the embodiment of the present invention.
- FIG. 5 is a view showing a fracture surface of the anisotropic bonded magnet according to the embodiment of the present invention.
- FIG. 6 is a diagram showing the thickness of the anisotropic bonded magnet and the limit of formation of the annular magnet according to the embodiment of the present invention.
- FIG. 7 is a partial cutaway view showing a motor equipped with an anisotropic bonded magnet according to an embodiment of the present invention.
- Binder component (oligomer or prepolymer with reaction substrate) 13 Magnetically anisotropic polycrystalline aggregated Nd Fe B powder
- bonded magnets mesh boundaries with shape-corresponding force that MEP hardly changes even with small diameter using anisotropic rare-earth magnet powder.
- An anisotropic bonded magnet having a phase is provided. If a bond magnet having a high MEP of 127 kjZm 3 or more can be provided in an arbitrary ring or arc shape applicable to a small motor, for example, it is possible to promote high performance of electric and electronic equipment.
- a new high-power 'power-saving permanent magnet type motor can be provided.
- the MEP of conventional isotropic bonded magnets is about 80 kjZm 3 in industry.
- the gap magnetic flux density between the motor magnet and the iron core is approximately the square root of the ratio of MEP.
- high output and size reduction of approximately 25% or more are expected.
- a bonded magnet having a self-organized network boundary phase according to the present invention (hereinafter referred to as an anisotropic bonded magnet according to the present invention) is an annular shape for improving the performance of a permanent magnet motor. Achieving both a variety of shape-responsive capabilities up to arcs and magnetic properties typified by MEP
- the structure of the anisotropic bonded magnet according to the present invention is composed of an oligomer or prepolymer (hereinafter, binder component and! /, U) having a rare earth magnet powder and a reaction substrate, and an extensible polymer.
- the composite dura-yule is compression-molded together with a stretchable polymer and chemical contact, and a boundary phase mainly composed of a stretchable polymer is disposed around the composite granule in a network form. In this way, it has a matrix structure composed of a binder component that immobilizes rare earth magnet powder by chemical bonding by forming chemical contact points, and an extensible polymer that bears shape adaptability.
- a lubricant during melt-kneading.
- pentaerythritol fatty acid ester is preferable.
- the amount added is 100 parts by weight of the extensible polymer. 3 to 15 parts by weight. Then, chemical contact points are provided on the composite granule and the boundary phase composed of the composite granule and a network to improve stretchability and weather resistance.
- the composite granule and the stretchable polymer are compressed at 5 MPa or more under a melt flow condition involving slipping, and the composite granule having a flat cross section perpendicular to the compression direction and the mesh boundary phase
- the configuration is as follows.
- rare earth magnet powder contained in the composite granule is magnetically anisotropic polycrystalline aggregated Nd Fe B powder with an average particle size of 50 ⁇ m or more, and an average particle size of 3 ⁇ m.
- Magnetically anisotropic single domain particle type Sm Fe N fine powder of m or less In particular, rare earth
- the proportion of single domain particle type Sm Fe N fine powder in the magnet powder shall be 40% or more.
- a melting point of 70- having an oxysilane ring: one or more of LOO ° C epoxy compounds, and a polyamide having a melting point of 80-150 ° C as an extensible polymer may be used. And are preferred.
- a powdery latent epoxy resin hardener capable of crosslinking with a binder component and a reaction substrate of an extensible polymer is preferable.
- the ratio of the rare earth magnet powder in the anisotropic bonded magnet according to the present invention is 95% by weight or more. Then, it is compression-molded in an orientation magnetic field perpendicular to the surface, in-plane direction, or both of which are regularly repeated to form a bonded magnet having a plate shape with a relative density of 98% or more and a thickness of 1.5 mm or less. . Finally, the entire bonded magnet is mechanically stretched by rolling through chemical contact points, and is formed into an annular shape by utilizing the flexibility generated in the rolling direction. Alternatively, the stretching ratio is changed by stamping to make an arc shape.
- the anisotropic bonded magnet according to the present invention is as follows: 2. MEP at 20 ° C when magnetized with OMAZm is usually 127 kjZm 3 or more, and is a small permanent magnet type that is a subject of the present invention. Improve motor performance.
- FIG. 1A to 1C are schematic views of an anisotropic bonded magnet according to the present invention. As shown in FIG. 1A, magnetically anisotropic polycrystalline aggregated Nd Fe B powder 13 having an average particle diameter of 50 m or more,
- Magnetically anisotropic single domain particle type Sm Fe N fine powder 14 with an average particle size of 3 ⁇ m or less is
- a coated magnet powder, a binder component 12, and a stretchable polymer 21 obtained by melt-kneading a rare earth magnet powder 11 and a stretchable polymer 21 and roughly pulverizing after cooling.
- Composite granule 10 having a configuration in which voids are reduced, or rare earth magnet powder 11, stretchable polymer 21 and lubricant 40 are melt-kneaded, cooled, and coarsely pulverized, coated magnet powder, binder
- a composite dallule 10 having a configuration with component 12, stretchable polymer 21 and lubricant 40 with reduced voids is shown.
- FIG. 1C shows that the boundary phase 20 mainly composed of the stretchable polymer 21 is arranged in a network at the boundary part between the composite granules 10, and the composite dalule 10 and the composite granules 10 and the network are arranged.
- An anisotropic bonded magnet according to the present invention having a structure in which a chemical contact point 30 is provided in the boundary phase 20 is shown! /
- the boundary phase 20 can compensate for a decrease in the stretchability of the magnet due to the increase in the volume fraction of the rare earth magnet powder 11 in the composite durdle 10. Moreover, if the boundary phase 20 becomes a network and becomes a continuous boundary phase between the composite granules 10, the boundary phase 20 existing in the network effectively increases the mechanical stretchability of the entire magnet. become. As a result, it is possible to provide the anisotropic bonded magnet 60 according to the present invention having a high MEP having a shape-corresponding force ranging from an annular shape to an arc shape.
- 2 14 is a polycrystalline aggregated Nd prepared by hot upsetting (Die— Up- Setting)
- Polycrystalline aggregated Nd Fe B magnet powder prepared by (Recombination) can be used
- the coercive force H at 20 ° C after 14 MAZm pulse magnetization should be greater than IMAZm.
- Fine pulverization is performed by a jet mill, a vibration ball mill, a rotating ball mill, etc., and pulverization is performed so that the Fisher average particle size is 1.5 ⁇ m or less, preferably 1.2 ⁇ m or less.
- fine powder desirably forms a gradual oxide film on the surface by wet or dry treatment. Further, it may be fine powder subjected to one or more kinds of surface treatments such as a method of forming a metal film or a method of forming an inorganic film.
- polycrystalline aggregated NdFeB powder 13 or single domain particle type SmFeN fine powder are present invention.
- the binder component referred to in the present invention is preferably an epoxy compound having a melting point of 70 to: LOO ° C. and having at least two oxosilane rings in the molecular chain.
- examples include epoxy oligomers obtained by bisphenols and epichlorohydrin or substituted picrohydrin, or obtained by various other methods.
- Preferable examples include polyglycidino reetenole O crezo mono lenenovolac type epoxy ligomer having an epoxy equivalent of 205 to 220 gZeq and a melting point of 70 to 76 ° C.
- the binder component 12 is added to the extensible polymer 21 and the polycrystalline aggregated NdFeB powder 13 and the single domain particle type SmFeN fine powder 14 at a melting point or higher of the extensible polymer 21 according to the present invention.
- the composite dallerule 10 that is obtained by melt-kneading the coated rare earth magnet powder and coarsely pulverizing it can be used in combination with polycrystalline aggregated NdFeB powder 13 and single domain particle type SmFeN fine powder 14.
- the ratio of both in the bonded magnet is 95% by weight or more, and single domain particle type Sm F
- the ratio of 2 e N fine powder 14 to 40% by weight or higher is required to achieve high MEP and initial irreversible demagnetization.
- Such a composite granule 10 can be easily prepared using a heatable kneading apparatus such as a roll mill or a twin screw extruder.
- the stretchable polymer 21 according to the present invention is preferably polyamide.
- polyamide examples thereof include nylon 6, nylon 66, nylon 610, nylon 612, nylon 11, nylon 12, etc. nylon, copolymer nylon, and blends thereof.
- It is a low melting point polyamide that can be used more suitably.
- a polyamide copolymer having a melting point of 80 to 150 ° C., an acid value of 10 or less, an amine value of 20 or less, and a molecular weight of 4000 to 12000, and an alcohol-soluble polyamide are preferable.
- the stretchable polymer 21 as described above is softened or melted at the production stage of the bonded magnet according to the present invention, or at least a part thereof is dissolved in an epoxy oligomer suitable as the binder component 12. It exhibits excellent mechanical strength while maintaining low temperature reactivity.
- the lubricant 40 exhibiting a melt flow accompanied by slip is melt-kneaded at the same time and coarsely pulverized to form the composite dallule 10.
- the lubricant 40 include a pentaerythritol fatty acid triester compound which is preferably a compound in which the internal slipping action on the rare earth magnet powder 11 and the external slipping action on the molding die wall surface are expressed with good consistency.
- a melt flow accompanied by a significant slip appears. If it exceeds 15 parts by weight, the external lubricity effect becomes too strong and it becomes difficult to mix into the composite dollule itself, and if it is less than 3 parts by weight, the melt flow phenomenon accompanied by slip is remarkable.
- An example of the chemical contact 31 that forms the chemical contact point 30 by reacting with the component binder component 12 and the reaction substrate of the stretchable polymer 21 is a hydantoin derivative as shown in (Chemical Formula 1).
- Rl and R2 are H or an alkyl residue.
- the composite dallule 10 according to the present invention is mixed with the extensible polymer 21 and the powdered chemical contact 31 forming the chemical contact point 30 therewith. Then, compression molding is performed under an orientation magnetic field.
- the compression molding pressure is 50 MPa or less. Under such material forms and molding conditions, the generation of new surfaces and microcracks of the rare earth magnet powder 13 is suppressed, so that deterioration of magnetic properties corresponding to permanent deterioration due to acid can be suppressed.
- the chemical contact point 30 can be formed by removing from the mold and post-curing.
- the anisotropic direction may be either the direction perpendicular to the plane of the plate magnet, the in-plane direction, or a regular repetition of both.
- compression molding is performed under a perpendicular or parallel orientation magnetic field.
- in-plane direction compression molding is performed with the orthogonal magnetic field orientation.
- the anisotropic bonded magnet that works on the present invention is preferably a thin plate having a thickness of 1.5 mm or less.
- the relative density of the anisotropic bonded magnet that is useful in the present invention is preferably 98% or more. If the relative density of the magnet decreases, when the chemical contact point 30 is formed, heating in the atmosphere increases the MEP corresponding to the permanent deterioration of the rare earth magnet powder 11 depending on the void volume. .
- FIG. 2 is a schematic diagram showing an example of the chemical structure of the anisotropic bonded magnet 60 that is useful in the present invention.
- the range of circle A indicated by the dotted line in the figure indicates the composite granule 10
- the range of circle B indicates the boundary phase 20.
- the binder component 12 contained in the composite dalleur 10 represents a polyglycidyl ether O cresol novolac type epoxy oligomer that fixes the rare earth magnet powder 11.
- stretchable polymer 21 present in part of circle A and circle B polyamide having a terminal carboxyl group is shown.
- the small circle C in the figure is This shows the Mikal contact point, which shows the formation of a chemical bond at the chemical contact point 30 by the chemical contact 31 shown in (Chemical Formula 1).
- the functional group of the binder component 12 for fixing the rare earth magnet powder 11 and the stretchable polymer 21 responsible for molecular chain orientation reacts directly with the chemical contact 31 or the binder component 12 by heat to self-organize.
- the chemical contact 31 penetrates into the binder component 12 and the stretchable polymer 21 at a melting point or higher and is chemically bonded.
- the boundary phase of the composite granules is provided in a network shape, and the extensible polymer is oriented in the molecular chain in the stretching direction. Then, the plate magnet can be converted into an annular shape or an arc shape by utilizing the flexibility expressed in the direction, and a magnet for a desired permanent magnet type motor can be obtained.
- the stretching method rolling is preferable when an annular magnet is used, and stamping is preferable when an arc magnet is used. Of course, they can be used together.
- the anisotropic bonded magnet according to the present invention has a 2. MEP at 20 ° C of 127 kjZm 3 or more when magnetized with OMAZm, and the various permanent magnet type motors targeted by the present invention are high. It can be improved.
- polycrystalline aggregated NdFeB powder 13 (NdDyFeCoBGaZr) with magnetically anisotropic average particle diameter of 80 m prepared by HDDR treatment and
- N fine powder 14 was used. Further, the binder component 12 according to the present invention has an epoxy equivalent
- Polyglycidyl ether mono-O-cresol novolac type epoxy oligomer having 205-220 gZeq and melting point 70-76 ° C was used.
- the extensible polymer 21 has a melting point 80 including a plasticizer.
- C polyamide powder having an acid value of 10 or less, an amine value of 20 or less, and a molecular weight of 4000 to 12000 was used.
- the chemical contact 31 that forms the chemical contact point 30 has the structure shown in (1).
- a latent epoxy resin hardener (hydantoin derivative) having an average particle diameter of 3 ⁇ m and a melting point of 80 to 100 ° C., and PETE having a melting point of about 52 ° C. were used as the lubricant 40.
- the bonded magnet which is useful in the present invention is composed of composite dull yule 10 as the main component and composite granule.
- the composite dollar 10 is composed of a boundary phase 20 that is arranged in a network shape, and the composite dollar 10 and the boundary phase 20 have a structure in which the chemical contact points 30 are chemically bonded.
- the first step of preparing the anisotropic bonded magnet according to the present invention is a polycrystalline aggregated Nd F
- the coated rare earth magnet powder is used. Next, it is melt-kneaded together with the stretchable polymer 21, and each granule is polycrystalline aggregated Nd Fe B powder 13, single domain particle type Sm F
- the composite dull-yule 10 includes a lubricant 40 that develops melt fluidity with slipping, and the particle diameter thereof is 500 m or less.
- the composite granule 10, the stretchable polymer 21 for forming the boundary phase 20, and the chemical contact point 30 are formed. Compression molding with chemical contact 31 under an oriented magnetic field.
- the anisotropic bonded magnet that works on the thin plate-like present invention prepared as described above is used as a final step from an annular shape to an arc shape so that it can be applied to various types of permanent magnet motors. Arbitrary shape.
- the binder component 12 is added to 60 parts by weight of the Nd Fe B powder 13.
- the ratio of The binder component 12 is preliminarily made into an acetone solution, and Nd Fe B powder 13 or Sm
- FIG. 3 is a diagram showing the relationship between the relative density and the compression pressure of the anisotropic bonded magnet of the present embodiment.
- Comparative Example 1 in the figure shows a case where 0.3 parts by weight of the chemical contact 31 is mixed with 100 parts by weight of the composite dull yule 10 according to the present invention (that is, the second stretchable polymer 21 is not added).
- the characteristic curve of Comparative Example 2 shows a case where the second composite granule according to the present invention is mixed with 0.3 part by weight of chemical contact 31 with respect to 100 parts by weight (that is, when PETE is not added). ) Show the characteristic curve!
- a bonded magnet having a relative density of 99% or more (porosity of less than 1%) can be obtained with a compression pressure of only 15 MPa. That is, in the anisotropic bonded magnet according to the present invention, the network boundary phase 20 plays a dominant role in the pressure dependence of the relative density.
- FIG. 4 is a diagram showing the relationship between the diameter of the disk extension and the thickness of the present embodiment and Comparative Examples 1 and 2.
- the curve indicated by the dotted line shows the relationship between the diameter and thickness of the magnet with a relative density of 100%.
- Comparative Example 2 deviates from the above curve, indicating that many voids are included, and suggesting that it is difficult to produce a magnet having a thickness of 830 ⁇ m or less.
- Comparative Example 1 is plotted on the dotted line showing the relationship between the diameter and thickness of the magnet with a relative density of 100%, indicating that there are few voids. However, it suggests that it is difficult to produce magnets with a thickness of 40 O / zm or less.
- the network boundary phase plays a major role in reducing voids and thinning of the bonded magnet. It is suggested that such void reduction and thinning of the bonded magnet have an advantageous effect on the production of a smaller-diameter annular magnet when the magnet is made flexible by stretching by boundary phase rolling.
- FIG. 5 is a view based on an SEM photograph showing a fracture surface of an anisotropic bonded magnet having a thickness of 350 ⁇ m that is useful for the present invention.
- the relatively large powders shown in the figure are polycrystalline aggregated Nd Fe B powder 13 coated with binder component 12, and the aggregates of relatively small powders are coated with binder component 12.
- the density of the bonded magnet obtained by the Archimedes method is 5.72Mg / m 3
- the logical density including the binder component is 5.77Mg / m 3
- the relative density of the anisotropic bonded magnet of this embodiment is 99. 01%.
- the theoretical density of the magnet is 7.
- the anisotropic bonded magnet according to the present invention is a conventional isotropic Nd Fe B bonded magnet.
- ultra-low pressure compression of 15 MPa can produce a bonded magnet with almost no void while suppressing damage such as crushing of magnetic powder and microcracks.
- an inexpensive non-magnetic material such as SUS304 can be used for compression molds such as upper and lower punches and dies.
- FIG. 6 is a diagram for explaining the limit of formation of an annular magnet in an anisotropic bonded magnet having a thickness of 300 to 1500 ⁇ m that is useful for the present invention.
- each bonded magnet is rolled at 120 ° C with a rolling reduction (elongation) of 4 to 5%, cooled to room temperature, and then wound around a mandrel with a different diameter using the flexibility developed in the rolling direction.
- the critical diameter was calculated without micro cracks. It is.
- Comparative Example 1 shown in the figure corresponds to Comparative Example 1 of FIGS. 3 and 4, and the difference from the present embodiment is that there is no network boundary phase at the boundary of the composite dollar-yule. Even in Comparative Example 1 where the boundary phase 20 mainly composed of the stretchable polymer 21 does not exist, flexibility is exhibited in the rolling direction by stretching of the stretchable polymer 21 contained in the composite dollule 10 by rolling. To do.
- the main component in the network boundary phase 20 is the stretchable polymer 21, and the single domain particle type Sm Fe
- a magnet with a thickness of 300 ⁇ m can be wound around a mandrel with a diameter of 200 ⁇ m. That is, by forming an annular magnet with a thickness of 300 / zm on a rotating shaft with a diameter of 200 / zm, an annular magnet rotor with a diameter of 0.8mm can be made with an anisotropic rare earth bonded magnet. Compared to the shape, the ability to cope with the shape is greatly increased.
- the MEP was 965kAZm. Also, different thickness of 300 ⁇ m
- the MEP was 127 kjZm 3 and the coercive force H was 976 kAZm.
- the MEP of the conventional isotropic bonded magnet is industrially about 80 kjZm 3 . Also, according to Japanese Patent Laid-Open No. 6-330102, it is difficult to produce a thin plate magnet having a thickness of less than 1 mm by compression molding in a parallel magnetic field with a high degree of orientation. On the other hand, the anisotropic bonded magnet according to the present invention can provide a bonded magnet having a MEP of 127 kjZm 3 even when the thickness is 300 ⁇ m.
- FIG. 7 shows an example of a small motor equipped with the anisotropic bonded magnet of the present invention.
- the motor 50 includes a rotor core 51 around which an anisotropic bonded magnet is wound, and a stator 52.
- the rotor core 51 and the stator 52 are normally used, and can be configured as described above.
- the anisotropic bonded magnet according to the present invention is a magnet having a high MEP and a shape-corresponding force, and a permanent magnet type magnet that requires various shapes such as an annular force and an arc shape. Suitable for high output, small and light weight.
- the present invention can provide a bonded magnet suitable for a high output key, small size and light weight of a magnet rotor type or magnet field type permanent magnet type motor used for driving electric and electronic equipment. Furthermore, a small motor using the same can be provided.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP05762039A EP1793393A4 (en) | 2004-08-24 | 2005-07-22 | ANISOTROPER RARE-BONDED MAGNET WITH SELF-ORGANIZED NETWORK PHASE AND PERMANENT MAGNETIC MOTOR THEREWITH |
JP2006531382A JP4710830B2 (ja) | 2004-08-24 | 2005-07-22 | 自己組織化した網目状境界相を有する異方性希土類ボンド磁石とそれを用いた永久磁石型モータ |
US11/659,619 US7828988B2 (en) | 2004-08-24 | 2005-07-22 | Anisotropic rare earth bonded magnet having self-organized network boundary phase and permanent magnet motor utilizing the same |
CN2005800283620A CN101006529B (zh) | 2004-08-24 | 2005-07-22 | 具有自组织化的网状边界相的各向异性稀土类粘结磁铁和使用该磁铁的永久磁铁型电动机 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004-243370 | 2004-08-24 | ||
JP2004243370 | 2004-08-24 |
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WO2006022101A1 true WO2006022101A1 (ja) | 2006-03-02 |
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US (1) | US7828988B2 (ja) |
EP (1) | EP1793393A4 (ja) |
JP (1) | JP4710830B2 (ja) |
CN (1) | CN101006529B (ja) |
WO (1) | WO2006022101A1 (ja) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US8072109B2 (en) * | 2006-03-16 | 2011-12-06 | Panasonic Corporation | Radial anisotropic magnet manufacturing method, permanent magnet motor using radial anisotropic magnet, and iron core-equipped permanent magnet motor |
JP5267800B2 (ja) * | 2009-02-27 | 2013-08-21 | ミネベア株式会社 | 自己修復性希土類−鉄系磁石 |
JP5344171B2 (ja) * | 2009-09-29 | 2013-11-20 | ミネベア株式会社 | 異方性希土類−鉄系樹脂磁石 |
JP2012099523A (ja) | 2010-10-29 | 2012-05-24 | Shin Etsu Chem Co Ltd | 異方性希土類焼結磁石及びその製造方法 |
JP6009745B2 (ja) * | 2011-08-24 | 2016-10-19 | ミネベア株式会社 | 希土類樹脂磁石の製造方法 |
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WO2003085684A1 (fr) * | 2002-04-09 | 2003-10-16 | Aichi Steel Corporation | Aimant anisotrope lie composite de terres rares, compose pour aimant anisotrope lie composite de terres rares, et procede de production de l'aimant |
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- 2005-07-22 JP JP2006531382A patent/JP4710830B2/ja active Active
- 2005-07-22 CN CN2005800283620A patent/CN101006529B/zh active Active
- 2005-07-22 US US11/659,619 patent/US7828988B2/en not_active Expired - Fee Related
- 2005-07-22 EP EP05762039A patent/EP1793393A4/en not_active Withdrawn
- 2005-07-22 WO PCT/JP2005/013479 patent/WO2006022101A1/ja active Application Filing
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JP2000232010A (ja) * | 1998-12-07 | 2000-08-22 | Sumitomo Metal Mining Co Ltd | 樹脂結合型磁石 |
WO2003085684A1 (fr) * | 2002-04-09 | 2003-10-16 | Aichi Steel Corporation | Aimant anisotrope lie composite de terres rares, compose pour aimant anisotrope lie composite de terres rares, et procede de production de l'aimant |
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Also Published As
Publication number | Publication date |
---|---|
EP1793393A4 (en) | 2007-11-28 |
US20070246128A1 (en) | 2007-10-25 |
JP4710830B2 (ja) | 2011-06-29 |
US7828988B2 (en) | 2010-11-09 |
CN101006529B (zh) | 2010-05-26 |
JPWO2006022101A1 (ja) | 2008-05-08 |
CN101006529A (zh) | 2007-07-25 |
EP1793393A1 (en) | 2007-06-06 |
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