WO2015019588A1 - Bonded magnet and motor - Google Patents

Bonded magnet and motor Download PDF

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Publication number
WO2015019588A1
WO2015019588A1 PCT/JP2014/004022 JP2014004022W WO2015019588A1 WO 2015019588 A1 WO2015019588 A1 WO 2015019588A1 JP 2014004022 W JP2014004022 W JP 2014004022W WO 2015019588 A1 WO2015019588 A1 WO 2015019588A1
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bonded magnet
magnet
resin
surface modifier
bonded
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PCT/JP2014/004022
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French (fr)
Japanese (ja)
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慎一 堤
近藤　憲司
暢謙 森田
植田　浩司
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パナソニックＩｐマネジメント株式会社
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Publication of WO2015019588A1 publication Critical patent/WO2015019588A1/en

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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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C2202/00—Physical properties
    • C22C2202/02—Magnetic

Definitions

  • the present invention relates to a high-density bonded magnet having high magnetic properties and a motor using this high-density bonded magnet.
  • a bonded magnet using a thermoplastic resin is manufactured by injection molding or extrusion molding.
  • a bonded magnet using a thermoplastic resin it is necessary to increase the filling amount of the magnetic powder in the bonded magnet in order to increase the performance of the bonded magnet.
  • the amount of resin in the bonded magnet decreases as the filling amount of the magnetic powder increases.
  • the bond magnet has decreased fluidity when the bond magnet is formed. Further, the produced bonded magnet had a reduced magnet strength.
  • Patent Document 1 discloses a composition for a synthetic resin magnet comprising a surface-treated magnetic powder and a polyamide resin. Specifically, a polyamide 6 resin having a number average molecular weight of 8000 to 10500 is used as the polyamide resin.
  • the composition of the synthetic resin magnet composition is 3 to 40% by weight of polyamide 6 resin and 97 to 60% by weight of magnetic powder.
  • Patent Document 2 discloses a method for producing a resin composition in which a resin binder and a filler are mixed to prepare a resin composition.
  • This production method is to obtain a filler in which 10 to 100% of the added coupling agent has reacted through two coupling treatment steps.
  • a silane coupling agent is added to the filler and kneaded. In this step, 95% or less of the added silane coupling agent is reacted. In other words, the coupling treatment filler in which the unreacted silane coupling agent is present in an amount of 5% or more of the added amount is adjusted.
  • the unreacted silane coupling agent is soluble in alcohol.
  • the following steps are performed as the secondary coupling process. That is, in the coupling treatment filler, the unreacted silane coupling agent remaining at 5% or more is slowly reacted over a slow time. As a result, the finally obtained coupling treatment filler is obtained by reacting 10 to 100% of the added amount of the total silane coupling agent. In other words, the unreacted silane coupling agent is 90% or less of the total silane coupling agent added.
  • the coupling filler thus obtained and the resin binder are mixed and kneaded.
  • Patent Document 3 discloses a bonded magnet manufacturing method in which a bonded magnet is injection-molded through two kneading steps.
  • thermoplastic resin binder is added to the magnetic powder made of a rare earth iron-based alloy and kneaded.
  • the bonded magnet material thus obtained is molded by injection into a target shape.
  • the surface of the magnetic powder is coated with a thermoplastic resin binder.
  • the coating process is performed as primary kneading.
  • thermoplastic resin binder is added and kneaded to the magnetic powder subjected to the coating treatment.
  • the bonded magnet material that has undergone the above processes is injection-molded into the desired shape.
  • the bonded magnet of the present invention includes magnet powder, a resin component, and a surface modifier.
  • FIG. 1A is an explanatory diagram showing a surface modifier used for the bonded magnet in Embodiment 1 of the present invention.
  • FIG. 1B is an enlarged view of the surface modifier shown in FIG. 1A.
  • FIG. 2 is a graph showing the relationship between the amount of surface modifier and fluidity in Embodiment 1 of the present invention.
  • FIG. 3 is a cross-sectional view of a main part of the motor according to Embodiment 2 of the present invention.
  • the bonded magnet according to the embodiment of the present invention can be molded into a bonded magnet having good fluidity and higher magnetic properties even if it is a molding material filled with magnet powder at a high density by the configuration described later.
  • the conventional method for manufacturing a bonded magnet had the following points to be improved. That is, as in the manufacturing method described in Patent Document 1, when polyamide 6 is used, it is difficult to manufacture a high-density bonded magnet using magnet powder.
  • high density means a density exceeding the magnet density of 6.0 Mg / m 3. This is because the polyamide 12 has a higher fluidity associated with melting, that is, higher melt fluidity than the polyamide 6.
  • FIG. 1A is an explanatory diagram showing a surface modifier used for the bonded magnet in Embodiment 1 of the present invention.
  • FIG. 1B is an enlarged view of the surface modifier shown in FIG. 1A.
  • FIG. 2 is a graph showing the relationship between the amount of surface modifier and fluidity in Embodiment 1 of the present invention.
  • the bonded magnet in the embodiment of the present invention includes magnet powder 2, resin component 5, and surface modifier 1.
  • the surface modifier 1 is compatible with the magnetic powder adsorbing portion 4 that adsorbs to the magnet powder 2 and the resin compatible with the resin component 5.
  • the surface modifier 1 is compatible with the magnetic powder adsorbing portion 4 that adsorbs to the magnet powder 2 and the resin compatible with the resin component 5.
  • the magnetic powder adsorption part 4 is a phosphate adsorption part.
  • the resin compatible part 3 is a polyester compatible part.
  • the magnet powder 2 used in the bonded magnet includes rare earth magnet powder.
  • the rare earth magnet powder may be NdFeB (Neodymium-Iron-Boron), SmFeN (Samarium-Iron-Nitrogen), SmCo (Samarium-Cobalt), or the like. These magnet powders 2 can be used as a single material. Alternatively, these magnet powders 2 can be used in combination of a plurality of materials.
  • the magnet powder 2 is preferably subjected to a surface treatment with a coupling agent, a surface treatment with a phosphate film treatment, or the like for the purpose of preventing oxidation.
  • the surface-treated magnet powder 2, the resin component 5 realized by, for example, a thermoplastic resin, and the surface modifier 1 are put into a kneading extruder and kneaded.
  • the surface modifier 1 has a magnetic powder adsorption part 4 and a resin compatible part 3. At the time of molding, the surface modifier 1 improves the filling property of the bonded magnet material when the bonded magnet material is filled into the mold.
  • the kneaded bonded magnet material is continuously discharged from the extrusion port of the kneading extruder.
  • the discharged bonded magnet material has an outer diameter of about 5 mm.
  • the discharged bonded magnet material is cooled to about 5 mm in length and then cooled. As a result, a cylindrical pellet having an outer diameter of about 5 mm and a length of about 5 mm is formed.
  • thermoplastic resin that is the resin component 5 a general thermoplastic resin such as polyamide 12 or PPS resin (Polyphenylene Sulfide Resin) can be used.
  • the bond magnet is manufactured by injection molding using the above-described pellets.
  • the bonded magnet has the following effects.
  • the bonded magnet includes magnet powder 2, resin component 5, and surface modifier 1.
  • the surface modifier 1 is a magnetic powder adsorption part 4 that adsorbs to the magnet powder 2 and a resin compatible part 3 that is compatible with the resin component 5.
  • the magnetic powder adsorption part 4 of the surface modifier 1 is adsorbed to the magnet powder 2.
  • the resin compatible part 3 of the surface modifier 1 has steric hindrance. Furthermore, the surface modifier 1 is compatible with the resin component 5. Therefore, when the surface modifier 1 is used, when the bonded magnet material is molded, the filling property of the bonded magnet material is improved when the bonded magnet material is filled into the mold.
  • the surface modifier 1 is a magnetic powder adsorption part 4 that adsorbs to the magnet powder 2 and a resin compatible part 3 that is compatible with the resin component 5. Therefore, the magnet powders 2 are firmly bonded via the resin component 5. As a result, the bond magnet has high strength.
  • the magnetic powder adsorption part 4 is a phosphate adsorption part. Therefore, the surface modifier 1 is firmly bonded to the magnet powder 2. As a result, fluidity is ensured when the bonded magnet is formed.
  • the resin compatible part 3 is a polyester compatible part. Therefore, the surface modifier 1 improves the compatibility of the resin component 5 between the bonded magnet and the surface modifier 1. As a result, fluidity is ensured when the bonded magnet is formed.
  • the materials used in this example are as follows.
  • As the magnet powder 2 96.5% by weight of Nd—Fe—B rare earth magnet powder was used.
  • the thermoplastic resin as the resin component 5 3.5% by weight of polyamide 12 having a softening point of 165 ° C. was used.
  • the surface modifier 1 was weighed in the form of being replaced with polyamide 12, and a predetermined amount was added as described later. In other words, the surface modifier 1 to be added was blended so that the total amount of the polyamide 12 and the surface modifier 1 would be constant.
  • the above-described bonded magnet material is put into a kneading extruder and kneaded.
  • the kneaded bonded magnet material was continuously discharged from the extrusion port of the kneading extruder.
  • the discharged bonded magnet material had an outer diameter of about 5 mm.
  • the discharged bonded magnet material was cut to about 5 mm in length and then cooled. As a result, a cylindrical pellet having an outer diameter of about 5 mm and a length of about 5 mm was formed.
  • the surface modifier 1 to be added was changed from 0 to 15 PHR with respect to the weight of the thermoplastic resin.
  • the fluidity was evaluated by a disk flow test described later.
  • a bonded magnet tablet was produced under the conditions described below. That is, the condition for producing the bond magnet tablet was that the mold temperature was 200 ° C. A pressure of 2 ton / cm 2 was applied to the bonded magnet material injected into the mold. Based on these conditions, a tablet having a diameter of 10 mm and a height of 3 mm was produced.
  • the flow diameter of the produced tablet was measured through the steps described below. That is, in the first step, the tablet was sandwiched between two iron plates whose surface temperature was heated to 175 ° C. The tablet sandwiched between the iron plates was applied with a pressure of 10 MPa for 15 seconds by a single action press. The tablet to which heat of 175 ° C. was applied was stretched by the melt flow of the resin component in the tablet.
  • the extended tablet has an oval shape.
  • the tablet having an elliptical shape has a major axis and a minor axis measured, and an average value thereof is defined as a flow diameter. That is, in a bonded magnet tablet, the higher the fluidity, the larger the flow diameter.
  • FIG. 2 shows the relationship between the amount of the surface modifier added and the measured flow diameter.
  • the surface modifier is used by replacing the thermoplastic resin. Therefore, in the bonded magnet, the fluidity can be improved without changing the magnetic powder filling amount.
  • FIG. 3 is a cross-sectional view of a main part of the motor according to the second embodiment of the present invention.
  • the motor 100 includes a rotor 30 using a bonded magnet and a stator 10 in which a winding 12 is wound around a stator core 11.
  • the rotor 30 has a magnet 32 on the outer periphery of the rotor core 31.
  • a magnet 32 a bonded magnet can be used.
  • the rotating shaft 16 is attached to the rotor core 31 so as to penetrate the shaft center 16a.
  • the rotating shaft 16 is rotatably supported by a pair of bearings 15 and 40.
  • the stator 10 is positioned to face the magnet 32.
  • the stator 10 has a winding 12 wound around a stator core 11.
  • the stator 10 is an insulating resin 13 and is integrally molded together with the outline of the motor 100.
  • the bonded magnet added with the surface modifier described in the first embodiment is used for the rotor 30 of the motor 100. Therefore, the magnetic characteristics of the rotor 30 are improved. As a result, the motor 100 shown in the second embodiment has high magnetic characteristics, and thus has high efficiency.
  • the high-density bonded magnet in the embodiment of the present invention is a bonded magnet having high magnetic characteristics, and a motor equipped with the bonded magnet is a highly efficient motor.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Hard Magnetic Materials (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)

Abstract

This bonded magnet contains a magnet powder (2), a resin component (5) and a surface modifying agent (1). In particular, the surface modifying agent (1) is composed of a magnet powder adsorption part that is adsorbed onto the magnet powder (2) and a resin compatible part that is compatible with the resin component (5). Specifically, the magnet powder adsorption part is a phosphoric acid-based adsorption part. Meanwhile, the resin compatible part is a polyester-based compatible part. In cases where a bonded magnet material is molded, the filling properties of the bonded magnet material can be improved by using the surface modifying agent (1) when a mold is filled with the bonded magnet material.

Description

ボンド磁石及びモータBond magnet and motor
　本発明は、高い磁気特性を有する高密度ボンド磁石と、この高密度ボンド磁石を用いたモータに関する。 The present invention relates to a high-density bonded magnet having high magnetic properties and a motor using this high-density bonded magnet.
　従来、熱可塑性樹脂が用いられるボンド磁石は、射出成形や押出成形にて作製される。熱可塑性樹脂が用いられるボンド磁石は、ボンド磁石の性能を高くするために、ボンド磁石中の磁性粉末の充填量を増大させる必要がある。一方、ボンド磁石は、磁性粉末の充填量が増大すれば、ボンド磁石中の樹脂量が少なくなる。ボンド磁石中の樹脂量が少なくなると、ボンド磁石は、ボンド磁石を成形する際に流動性が低下していた。また、作製されたボンド磁石は、磁石強度が低下していた。 Conventionally, a bonded magnet using a thermoplastic resin is manufactured by injection molding or extrusion molding. In a bonded magnet using a thermoplastic resin, it is necessary to increase the filling amount of the magnetic powder in the bonded magnet in order to increase the performance of the bonded magnet. On the other hand, the amount of resin in the bonded magnet decreases as the filling amount of the magnetic powder increases. When the amount of resin in the bond magnet decreases, the bond magnet has decreased fluidity when the bond magnet is formed. Further, the produced bonded magnet had a reduced magnet strength.
　これらの課題を解決するために、後述する、いくつかの改善策が提案されている。 In order to solve these problems, several improvement measures, which will be described later, have been proposed.
　特許文献１には、表面処理された磁性体粉末と、ポリアミド樹脂と、からなる合成樹脂磁石用組成物について、開示されている。具体的には、ポリアミド樹脂として、数平均分子量が８０００～１０５００であるポリアミド６樹脂が用いられる。合成樹脂磁石用組成物の組成は、ポリアミド６樹脂が３～４０重量％と、磁性体粉末が９７～６０重量％と、である。 Patent Document 1 discloses a composition for a synthetic resin magnet comprising a surface-treated magnetic powder and a polyamide resin. Specifically, a polyamide 6 resin having a number average molecular weight of 8000 to 10500 is used as the polyamide resin. The composition of the synthetic resin magnet composition is 3 to 40% by weight of polyamide 6 resin and 97 to 60% by weight of magnetic powder.
　特許文献２には、樹脂バインダと充填剤とを混ぜ合わせて、樹脂組成物を調整する、樹脂組成物の製造方法が開示されている。 Patent Document 2 discloses a method for producing a resin composition in which a resin binder and a filler are mixed to prepare a resin composition.
　この製造方法は、２つのカップリング処理工程を経て、添加したカップリング剤の１０～１００％が反応した充填剤を得る、というものである。 This production method is to obtain a filler in which 10 to 100% of the added coupling agent has reacted through two coupling treatment steps.
　すなわち、一次カップリング処理として、つぎの工程が行われる。まず、充填剤には、シランカップリング剤が添加されて混練される。この工程では、添加されたシランカップリング剤のうち、９５％以下が反応される。換言すれば、未反応のシランカップリング剤が、添加した量の５％以上存在する、カップリング処理充填剤が調整される。未反応のシランカップリング剤は、アルコール可溶である。 That is, the following steps are performed as the primary coupling process. First, a silane coupling agent is added to the filler and kneaded. In this step, 95% or less of the added silane coupling agent is reacted. In other words, the coupling treatment filler in which the unreacted silane coupling agent is present in an amount of 5% or more of the added amount is adjusted. The unreacted silane coupling agent is soluble in alcohol.
　つぎに、二次カップリング処理として、つぎの工程が行われる。つまり、カップリング処理充填剤において、５％以上残存する未反応のシランカップリング剤は、ゆっくりと時間を掛けて、静かに反応される。この結果、最終的に得られるカップリング処理充填剤は、添加した全シランカップリング剤の添加量のうち、１０～１００％が反応したものである。換言すれば、未反応のシランカップリング剤は、添加した全シランカップリング剤の９０％以下である。 Next, the following steps are performed as the secondary coupling process. That is, in the coupling treatment filler, the unreacted silane coupling agent remaining at 5% or more is slowly reacted over a slow time. As a result, the finally obtained coupling treatment filler is obtained by reacting 10 to 100% of the added amount of the total silane coupling agent. In other words, the unreacted silane coupling agent is 90% or less of the total silane coupling agent added.
　このようにして得られたカップリング処理充填剤と、樹脂バインダとが、混ぜられて、練り合わされる。 The coupling filler thus obtained and the resin binder are mixed and kneaded.
　特許文献３には、２つの混練工程を経て、ボンド磁石を射出成形する、ボンド磁石の製造方法が開示されている。 Patent Document 3 discloses a bonded magnet manufacturing method in which a bonded magnet is injection-molded through two kneading steps.
　希土類鉄系合金からなる磁性粉には、熱可塑性樹脂バインダが添加されて混練される。このようにして得られたボンド磁石材は、目的とする形状に射出して成形される。 A thermoplastic resin binder is added to the magnetic powder made of a rare earth iron-based alloy and kneaded. The bonded magnet material thus obtained is molded by injection into a target shape.
　該製造方法の１次混練工程において、磁性粉の表面は、熱可塑性樹脂バインダにてコーティングがなされる、コーティング処理が施される。コーティング処理は、１次混練として行われる。 In the primary kneading step of the production method, the surface of the magnetic powder is coated with a thermoplastic resin binder. The coating process is performed as primary kneading.
　その後、２次混練工程において、コーティング処理が施された磁性粉には、熱可塑性樹脂バインダが添加されて混練される。 Thereafter, in the secondary kneading step, a thermoplastic resin binder is added and kneaded to the magnetic powder subjected to the coating treatment.
　以上の工程を経たボンド磁石材が、目的の形状に射出成形される。 The bonded magnet material that has undergone the above processes is injection-molded into the desired shape.
特開２００２－２８９４１６号公報JP 2002-289416 A 特開２００１－２３３９６３号公報JP 2001-233963 A 特開２０１０－１９２５４２号公報JP 2010-192542 A
　本発明のボンド磁石は、磁石粉末と、樹脂成分と、表面改質剤と、を含む。 The bonded magnet of the present invention includes magnet powder, a resin component, and a surface modifier.
図１Ａは、本発明の実施の形態１におけるボンド磁石に用いられる表面改質剤を示す説明図である。FIG. 1A is an explanatory diagram showing a surface modifier used for the bonded magnet in Embodiment 1 of the present invention. 図１Ｂは、図１Ａで示した表面改質剤の拡大図である。FIG. 1B is an enlarged view of the surface modifier shown in FIG. 1A. 図２は、本発明の実施の形態１における表面改質剤量と流動性との関係を示すグラフである。FIG. 2 is a graph showing the relationship between the amount of surface modifier and fluidity in Embodiment 1 of the present invention. 図３は、本発明の実施の形態２におけるモータの要部断面図である。FIG. 3 is a cross-sectional view of a main part of the motor according to Embodiment 2 of the present invention.
　本発明の実施の形態であるボンド磁石は、後述する構成により、磁石粉末が高い密度で充填された成形材料であっても、流動性がよく、より高い磁気特性を有するボンド磁石を成形できる。 The bonded magnet according to the embodiment of the present invention can be molded into a bonded magnet having good fluidity and higher magnetic properties even if it is a molding material filled with magnet powder at a high density by the configuration described later.
　また、このボンド磁石が用いられたモータは、上述したボンド磁石の効果により、効率が向上する。 Moreover, the efficiency of the motor using this bonded magnet is improved by the effect of the bonded magnet described above.
　つまり、従来のボンド磁石の製造方法には、つぎの改善すべき点があった。すなわち、特許文献１に記載された製造方法のように、ポリアミド６を用いる場合、磁石粉末を用いて、高密度のボンド磁石を製造することは、困難であった。 In other words, the conventional method for manufacturing a bonded magnet had the following points to be improved. That is, as in the manufacturing method described in Patent Document 1, when polyamide 6 is used, it is difficult to manufacture a high-density bonded magnet using magnet powder.
　ここで、高密度とは、磁石密度６．０Ｍｇ／ｍ３を超える密度をいう。この理由は、ポリアミド１２は、ポリアミド６と比べて、溶融に伴う流動性、すなわち、溶融流動性が高いためである。 Here, high density means a density exceeding the magnet density of 6.0 Mg / m 3. This is because the polyamide 12 has a higher fluidity associated with melting, that is, higher melt fluidity than the polyamide 6.
　つぎに、特許文献２に記載された製造方法のように、カップリング剤を用いる場合、樹脂組成物の強度を向上することはできる。しかしながら、カップリング剤を用いる場合、金型に樹脂バインダと充填剤とを流し込む際、流動性が十分ではない。よって、更なる流動性の改善が求められていた。 Next, as in the production method described in Patent Document 2, when a coupling agent is used, the strength of the resin composition can be improved. However, when a coupling agent is used, the fluidity is not sufficient when the resin binder and filler are poured into the mold. Therefore, further improvement in fluidity has been demanded.
　さらに、特許文献３に記載された製造方法のように、２つの混練工程を経る場合、ボンド磁石材の均一性を向上することはできる。しかしながら、特許文献３に記載された製造方法は、２つの混練工程を経る場合、製造上、重要な指標である、流動性を改善するものではない。 Furthermore, as in the manufacturing method described in Patent Document 3, when two kneading steps are performed, the uniformity of the bonded magnet material can be improved. However, the production method described in Patent Document 3 does not improve the fluidity, which is an important index in production when two kneading steps are performed.
　以下、本発明の実施の形態について、図面を用いて説明する。なお、以下の実施の形態は、本発明を具体化した一例であって、本発明の技術的範囲を限定するものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following embodiments are examples embodying the present invention, and do not limit the technical scope of the present invention.
　（実施の形態１）
　図１Ａは、本発明の実施の形態１におけるボンド磁石に用いられる表面改質剤を示す説明図である。図１Ｂは、図１Ａで示した表面改質剤の拡大図である。図２は、本発明の実施の形態１における表面改質剤量と流動性との関係を示すグラフである。 (Embodiment 1)
FIG. 1A is an explanatory diagram showing a surface modifier used for the bonded magnet in Embodiment 1 of the present invention. FIG. 1B is an enlarged view of the surface modifier shown in FIG. 1A. FIG. 2 is a graph showing the relationship between the amount of surface modifier and fluidity in Embodiment 1 of the present invention.
　図１Ａに示すように、本発明の実施の形態におけるボンド磁石は、磁石粉末２と、樹脂成分５と、表面改質剤１と、を含む。 As shown in FIG. 1A, the bonded magnet in the embodiment of the present invention includes magnet powder 2, resin component 5, and surface modifier 1.
　特に、顕著な作用効果を奏する形態は、つぎのとおりである。すなわち、図１Ａ、図１Ｂに示すように、本実施の形態におけるボンド磁石において、表面改質剤１は、磁石粉末２に吸着する磁粉吸着部４と、樹脂成分５と相溶する樹脂相溶部３と、である。 In particular, the following forms exhibit significant operational effects. That is, as shown in FIG. 1A and FIG. 1B, in the bonded magnet in the present embodiment, the surface modifier 1 is compatible with the magnetic powder adsorbing portion 4 that adsorbs to the magnet powder 2 and the resin compatible with the resin component 5. Part 3.
　特に、磁粉吸着部４は、リン酸系吸着部である。また、樹脂相溶部３は、ポリエステル系相溶部である。 In particular, the magnetic powder adsorption part 4 is a phosphate adsorption part. The resin compatible part 3 is a polyester compatible part.
　さらに、図面を用いて、詳細に説明する。 Furthermore, it explains in detail using a drawing.
　図１Ａ、図１Ｂに示すように、ボンド磁石に用いられる磁石粉末２には、希土類の磁石粉末がある。希土類の磁石粉末は、ＮｄＦｅＢ（Ｎｅｏｄｙｍｉｕｍ－ｉｒｏｎ－Ｂｏｒｏｎ）系、ＳｍＦｅＮ（Ｓａｍａｒｉｕｍ－ｉｒｏｎ－Ｎｉｔｒｏｇｅｎ）系、あるいは、ＳｍＣｏ（Ｓａｍａｒｉｕｍ－Ｃｏｂａｌｔ）系などが使用できる。なお、これらの磁石粉末２は、単独の材料で用いることができる。あるいは、これらの磁石粉末２は、複数の材料を組合せて用いることができる。 As shown in FIGS. 1A and 1B, the magnet powder 2 used in the bonded magnet includes rare earth magnet powder. The rare earth magnet powder may be NdFeB (Neodymium-Iron-Boron), SmFeN (Samarium-Iron-Nitrogen), SmCo (Samarium-Cobalt), or the like. These magnet powders 2 can be used as a single material. Alternatively, these magnet powders 2 can be used in combination of a plurality of materials.
　さらに、磁石粉末２には、酸化防止を目的として、カップリング剤による表面処理や、リン酸塩皮膜処理による表面処理などを行うことが好ましい。 Furthermore, the magnet powder 2 is preferably subjected to a surface treatment with a coupling agent, a surface treatment with a phosphate film treatment, or the like for the purpose of preventing oxidation.
　表面処理が行われた磁石粉末２と、例えば、熱可塑性樹脂で実現される樹脂成分５と、表面改質剤１とは、混練押出機に投入されて混練される。表面改質剤１は、磁粉吸着部４と樹脂相溶部３とを有する。成形時において、表面改質剤１は、ボンド磁石材が金型へ充填される際、ボンド磁石材の充填性を向上させる。 The surface-treated magnet powder 2, the resin component 5 realized by, for example, a thermoplastic resin, and the surface modifier 1 are put into a kneading extruder and kneaded. The surface modifier 1 has a magnetic powder adsorption part 4 and a resin compatible part 3. At the time of molding, the surface modifier 1 improves the filling property of the bonded magnet material when the bonded magnet material is filled into the mold.
　混練されたボンド磁石材は、混練押出機の押出口から、連続して排出される。排出されるボンド磁石材は、外径が５ｍｍ程度である。排出されたボンド磁石材は、長さ５ｍｍ程度に切断された後、冷却される。この結果、外径が５ｍｍ程度で、長さが５ｍｍ程度の円柱状のペレットが、形成される。 The kneaded bonded magnet material is continuously discharged from the extrusion port of the kneading extruder. The discharged bonded magnet material has an outer diameter of about 5 mm. The discharged bonded magnet material is cooled to about 5 mm in length and then cooled. As a result, a cylindrical pellet having an outer diameter of about 5 mm and a length of about 5 mm is formed.
　樹脂成分５である熱可塑性樹脂には、一般的な熱可塑性樹脂、例えば、ポリアミド１２やＰＰＳ樹脂（Ｐｏｌｙ　Ｐｈｅｎｙｌｅｎｅ　Ｓｕｌｆｉｄｅ　Ｒｅｓｉｎ）などが使用できる。ボンド磁石は、上述したペレットを用いて、射出成形が行われることで、作製される。 As the thermoplastic resin that is the resin component 5, a general thermoplastic resin such as polyamide 12 or PPS resin (Polyphenylene Sulfide Resin) can be used. The bond magnet is manufactured by injection molding using the above-described pellets.
　上述した構成により、ボンド磁石は、つぎの作用効果を奏する。 With the above-described configuration, the bonded magnet has the following effects.
　すなわち、ボンド磁石は、磁石粉末２と、樹脂成分５と、表面改質剤１と、を含む。ボンド磁石において、表面改質剤１は、磁石粉末２に吸着する磁粉吸着部４と、樹脂成分５と相溶する樹脂相溶部３と、である。 That is, the bonded magnet includes magnet powder 2, resin component 5, and surface modifier 1. In the bonded magnet, the surface modifier 1 is a magnetic powder adsorption part 4 that adsorbs to the magnet powder 2 and a resin compatible part 3 that is compatible with the resin component 5.
　よって、表面改質剤１の磁粉吸着部４は、磁石粉末２に吸着する。表面改質剤１の樹脂相溶部３は、立体障害を有する。さらに、表面改質剤１は、樹脂成分５と相溶する。従って、表面改質剤１を用いれば、ボンド磁石材を成形する場合、ボンド磁石材が金型へ充填される際、ボンド磁石材の充填性を向上させる。 Therefore, the magnetic powder adsorption part 4 of the surface modifier 1 is adsorbed to the magnet powder 2. The resin compatible part 3 of the surface modifier 1 has steric hindrance. Furthermore, the surface modifier 1 is compatible with the resin component 5. Therefore, when the surface modifier 1 is used, when the bonded magnet material is molded, the filling property of the bonded magnet material is improved when the bonded magnet material is filled into the mold.
　この結果、磁石粉末２を高い密度で充填した成形材料であっても、流動性がよくなる。よって、より高い磁気特性を有するボンド磁石が、成形できる。 As a result, even if the molding material is filled with the magnet powder 2 at a high density, the fluidity is improved. Therefore, a bonded magnet having higher magnetic properties can be formed.
　特に、表面改質剤１は、磁石粉末２に吸着する磁粉吸着部４と、樹脂成分５と相溶する樹脂相溶部３と、である。よって、磁石粉末２どうしが、樹脂成分５を介して、強固に結合する。その結果、ボンド磁石は、強度が高くなる。 In particular, the surface modifier 1 is a magnetic powder adsorption part 4 that adsorbs to the magnet powder 2 and a resin compatible part 3 that is compatible with the resin component 5. Therefore, the magnet powders 2 are firmly bonded via the resin component 5. As a result, the bond magnet has high strength.
　特に、磁粉吸着部４は、リン酸系吸着部である。よって、表面改質剤１は、磁石粉末２と強固に結合される。その結果、ボンド磁石を成形するとき、流動性が確保される。 In particular, the magnetic powder adsorption part 4 is a phosphate adsorption part. Therefore, the surface modifier 1 is firmly bonded to the magnet powder 2. As a result, fluidity is ensured when the bonded magnet is formed.
　特に、樹脂相溶部３は、ポリエステル系相溶部である。よって、表面改質剤１は、ボンド磁石と表面改質剤１との樹脂成分５の相溶性が良くなる。その結果、ボンド磁石を成形するとき、流動性が確保される。 In particular, the resin compatible part 3 is a polyester compatible part. Therefore, the surface modifier 1 improves the compatibility of the resin component 5 between the bonded magnet and the surface modifier 1. As a result, fluidity is ensured when the bonded magnet is formed.
　次に、本発明の実施例について説明する。 Next, examples of the present invention will be described.
　まず、本実施例にて用いた材料は、つぎのとおりである。磁石粉末２は、Ｎｄ－Ｆｅ－Ｂ系の希土類磁石粉末を、９６．５重量％用いた。樹脂成分５である熱可塑性樹脂には、軟化点１６５℃のポリアミド１２を、３．５重量％用いた。表面改質剤１は、ポリアミド１２に置換する形で計量し、後述するように、所定量を添加した。換言すれば、添加する表面改質剤１は、ポリアミド１２と表面改質剤１とを合せた量が一定となるように、配合した。 First, the materials used in this example are as follows. As the magnet powder 2, 96.5% by weight of Nd—Fe—B rare earth magnet powder was used. For the thermoplastic resin as the resin component 5, 3.5% by weight of polyamide 12 having a softening point of 165 ° C. was used. The surface modifier 1 was weighed in the form of being replaced with polyamide 12, and a predetermined amount was added as described later. In other words, the surface modifier 1 to be added was blended so that the total amount of the polyamide 12 and the surface modifier 1 would be constant.
　上述したボンド磁石の材料は、混練押出機に投入されて混練される。 The above-described bonded magnet material is put into a kneading extruder and kneaded.
　混練されたボンド磁石材は、混練押出機の押出口から、連続して排出された。排出されたボンド磁石材は、外径が５ｍｍ程度であった。排出されたボンド磁石材は、長さ５ｍｍ程度に切断された後、冷却された。この結果、外径が５ｍｍ程度で、長さが５ｍｍ程度の円柱状のペレットが、形成された。 The kneaded bonded magnet material was continuously discharged from the extrusion port of the kneading extruder. The discharged bonded magnet material had an outer diameter of about 5 mm. The discharged bonded magnet material was cut to about 5 mm in length and then cooled. As a result, a cylindrical pellet having an outer diameter of about 5 mm and a length of about 5 mm was formed.
　添加する表面改質剤１は、熱可塑性樹脂の重量に対して、０～１５ＰＨＲまで変化させた。また、流動性の評価は、後述するディスクフロー試験にて行った。 The surface modifier 1 to be added was changed from 0 to 15 PHR with respect to the weight of the thermoplastic resin. The fluidity was evaluated by a disk flow test described later.
　以下に、ディスクフロー試験の概要を示す。 The following is an outline of the disk flow test.
　まず、後述する条件にて、ボンド磁石のタブレットを作製した。すなわち、ボンド磁石のタブレットを作製する条件は、金型の温度が２００℃であった。金型に注入したボンド磁石材には、２ｔｏｎ／ｃｍ２の圧力が加えられた。本条件に基いて、直径１０ｍｍ、高さ３ｍｍのタブレットが作製された。 First, a bonded magnet tablet was produced under the conditions described below. That is, the condition for producing the bond magnet tablet was that the mold temperature was 200 ° C. A pressure of 2 ton / cm 2 was applied to the bonded magnet material injected into the mold. Based on these conditions, a tablet having a diameter of 10 mm and a height of 3 mm was produced.
　つぎに、後述する工程を経て、作製したタブレットの流動径を測定した。すなわち、最初の工程において、タブレットは、表面温度が１７５℃に熱せされた、２枚の鉄板で挟まれた。鉄板で挟まれたタブレットは、単動プレスにて、１０ＭＰａの圧力が、１５秒間加えられた。１７５℃の熱が加えられたタブレットは、タブレット内の樹脂成分の溶融流動により、引き伸ばされた。 Next, the flow diameter of the produced tablet was measured through the steps described below. That is, in the first step, the tablet was sandwiched between two iron plates whose surface temperature was heated to 175 ° C. The tablet sandwiched between the iron plates was applied with a pressure of 10 MPa for 15 seconds by a single action press. The tablet to which heat of 175 ° C. was applied was stretched by the melt flow of the resin component in the tablet.
　引き延ばされたタブレットは、楕円形状となった。楕円形状となったタブレットは、長軸と短軸とが測定され、その平均値を流動径とした。つまり、ボンド磁石のタブレットにおいて、流動性が高ければ、流動径も大きくなる。 The extended tablet has an oval shape. The tablet having an elliptical shape has a major axis and a minor axis measured, and an average value thereof is defined as a flow diameter. That is, in a bonded magnet tablet, the higher the fluidity, the larger the flow diameter.
　図２は、添加された表面改質剤の量と、測定された流動径との関係が示される。 FIG. 2 shows the relationship between the amount of the surface modifier added and the measured flow diameter.
　この結果より、表面改質剤を添加すれば、流動径が大きくなることが確認できた。換言すれば、表面改質剤を添加すれば、流動性が向上することが確認できた。 From this result, it was confirmed that if the surface modifier was added, the flow diameter was increased. In other words, it was confirmed that the flowability was improved by adding a surface modifier.
　なお、表面改質剤は、熱可塑性樹脂を置換して用いている。よって、ボンド磁石において、磁粉充填量を変化させることなく、流動性を改善できる。 Note that the surface modifier is used by replacing the thermoplastic resin. Therefore, in the bonded magnet, the fluidity can be improved without changing the magnetic powder filling amount.
　（実施の形態２）
　つぎに、実施の形態１にて説明したボンド磁石が、モータに用いられた形態について、図面を用いて説明する。 (Embodiment 2)
Next, the form in which the bonded magnet described in the first embodiment is used in a motor will be described with reference to the drawings.
　図３は、本発明の実施の形態２におけるモータの要部断面図である。 FIG. 3 is a cross-sectional view of a main part of the motor according to the second embodiment of the present invention.
　図３に示すように、本発明の実施の形態２におけるモータ１００は、ボンド磁石を用いたロータ３０と、ステータコア１１に巻線１２が巻装されたステータ１０と、を有する。 As shown in FIG. 3, the motor 100 according to the second embodiment of the present invention includes a rotor 30 using a bonded magnet and a stator 10 in which a winding 12 is wound around a stator core 11.
　図面とともに、詳細に説明する。 Detailed explanation will be given with drawings.
　図３に示すように、ロータ３０は、ロータコア３１の外周部分に磁石３２を有する。磁石３２は、ボンド磁石を用いることができる。ロータコア３１は、軸心１６ａを貫通するように、回転軸１６が取付けられる。回転軸１６は、一対の軸受１５、４０で、回転自在に支持される。 As shown in FIG. 3, the rotor 30 has a magnet 32 on the outer periphery of the rotor core 31. As the magnet 32, a bonded magnet can be used. The rotating shaft 16 is attached to the rotor core 31 so as to penetrate the shaft center 16a. The rotating shaft 16 is rotatably supported by a pair of bearings 15 and 40.
　磁石３２と対向して、ステータ１０が位置する。ステータ１０は、ステータコア１１に対して、巻線１２が巻装される。ステータ１０は、絶縁樹脂１３で、モータ１００の外郭とともに、一体で成型される。 The stator 10 is positioned to face the magnet 32. The stator 10 has a winding 12 wound around a stator core 11. The stator 10 is an insulating resin 13 and is integrally molded together with the outline of the motor 100.
　実施の形態１にて説明した、表面改質剤が添加されたボンド磁石が、モータ１００のロータ３０に用いられる。よって、ロータ３０の磁気特性は向上する。この結果、実施の形態２に示すモータ１００は、高い磁気特性を有するため、高効率となる。 The bonded magnet added with the surface modifier described in the first embodiment is used for the rotor 30 of the motor 100. Therefore, the magnetic characteristics of the rotor 30 are improved. As a result, the motor 100 shown in the second embodiment has high magnetic characteristics, and thus has high efficiency.
　本発明の実施の形態における高密度ボンド磁石は、高い磁気特性を有するボンド磁石であり、このボンド磁石を搭載したモータは、高効率なモータとなる。 The high-density bonded magnet in the embodiment of the present invention is a bonded magnet having high magnetic characteristics, and a motor equipped with the bonded magnet is a highly efficient motor.
　１　　表面改質剤
　２　　磁石粉末
　３　　樹脂相溶部
　４　　磁粉吸着部
　５　　樹脂成分
　１０　　ステータ
　１１　　ステータコア
　１２　　巻線
　１３　　絶縁樹脂
　１５，４０　　軸受
　１６　　回転軸
　１６ａ　　軸心
　３０　　ロータ
　３１　　ロータコア
　３２　　磁石（ボンド磁石）
　１００　　モータ DESCRIPTION OF SYMBOLS 1 Surface modifier 2 Magnet powder 3 Resin compatible part 4 Magnetic powder adsorption part 5 Resin component 10 Stator 11 Stator core 12 Winding 13 Insulating resin 15, 40 Bearing 16 Rotating shaft 16a Axis 30 Rotor 31 Rotor core 32 Magnet (bond magnet)
100 motor

Claims (5)

  1. 磁石粉末と、樹脂成分と、表面改質剤と、を含むボンド磁石。 A bonded magnet comprising magnet powder, a resin component, and a surface modifier.
  2. 前記表面改質剤は、前記磁石粉末に吸着する磁粉吸着部と、前記樹脂成分と相溶する樹脂相溶部と、である請求項１に記載のボンド磁石。 The bonded magnet according to claim 1, wherein the surface modifier is a magnetic powder adsorbing part that adsorbs to the magnet powder and a resin compatible part that is compatible with the resin component.
  3. 前記磁粉吸着部は、リン酸系吸着部である、請求項２に記載のボンド磁石。 The bonded magnet according to claim 2, wherein the magnetic powder adsorption part is a phosphate adsorption part.
  4. 前記樹脂相溶部は、ポリエステル系相溶部である、請求項２に記載のボンド磁石。 The bonded magnet according to claim 2, wherein the resin compatible part is a polyester compatible part.
  5. 請求項１から請求項４のいずれか一項に記載のボンド磁石を用いたロータと、
    ステータコアに巻線が巻装されたステータと、を有するモータ。     A rotor using the bonded magnet according to any one of claims 1 to 4,
    And a stator having a winding wound around a stator core.
PCT/JP2014/004022 2013-08-07 2014-07-31 Bonded magnet and motor WO2015019588A1 (en)

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WO2019012917A1 (en) * 2017-07-14 2019-01-17 パナソニックＩｐマネジメント株式会社 Composite material

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CN107424703B (en) * 2017-09-06 2018-12-11 内蒙古鑫众恒磁性材料有限责任公司 Grain boundary decision legal system makees the heavy rare earth attachment technique of sintered NdFeB permanent magnet

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JPH1192657A (en) * 1997-09-19 1999-04-06 Daicel Huels Ltd Polyamide resin for metal powder compound molding
JP2010222394A (en) * 2009-03-19 2010-10-07 Ube Ind Ltd Polyamide resin composition for molding magnetic material resin composite, magnetic material resin composite material, and magnetic material resin composite

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JPH1192657A (en) * 1997-09-19 1999-04-06 Daicel Huels Ltd Polyamide resin for metal powder compound molding
JP2010222394A (en) * 2009-03-19 2010-10-07 Ube Ind Ltd Polyamide resin composition for molding magnetic material resin composite, magnetic material resin composite material, and magnetic material resin composite

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019012917A1 (en) * 2017-07-14 2019-01-17 パナソニックＩｐマネジメント株式会社 Composite material

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