WO2015019588A1 - Aimant aggloméré et moteur - Google Patents

Aimant aggloméré et moteur 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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WO
WIPO (PCT)
Prior art keywords
bonded magnet
magnet
resin
surface modifier
bonded
Prior art date
Application number
PCT/JP2014/004022
Other languages
English (en)
Japanese (ja)
Inventor
慎一 堤
近藤　憲司
暢謙 森田
植田　浩司
Original Assignee
パナソニックＩｐマネジメント株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Publication of WO2015019588A1 publication Critical patent/WO2015019588A1/fr

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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

La présente invention concerne un aimant aggloméré qui contient une poudre (2) d'aimant, un composant (5) de résine et un agent modificateur (1) de surface. En particulier, l'agent modificateur (1) de surface est composé d'une partie d'adsorption sur poudre d'aimant qui est adsorbée sur la poudre (2) d'aimant et d'une partie compatible avec la résine qui est compatible avec le composant (5) de résine. Plus précisément, la partie d'adsorption sur poudre d'aimant est une partie d'adsorption à base d'acide phosphorique. Parallèlement, la partie compatible avec la résine est une partie compatible à base de polyester. Dans les cas où un matériau d'aimant aggloméré est moulé, les propriétés de remplissage du matériau d'aimant aggloméré peuvent être améliorées en utilisant l'agent modificateur (1) de surface lorsqu'un moule est rempli du matériau d'aimant aggloméré.
PCT/JP2014/004022 2013-08-07 2014-07-31 Aimant aggloméré et moteur WO2015019588A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013163873A JP2016178098A (ja) 2013-08-07 2013-08-07 ボンド磁石及びモータ
JP2013-163873 2013-08-07

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WO2015019588A1 true WO2015019588A1 (fr) 2015-02-12

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WO (1) WO2015019588A1 (fr)

Cited By (1)

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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107424703B (zh) * 2017-09-06 2018-12-11 内蒙古鑫众恒磁性材料有限责任公司 晶界扩散法制作烧结钕铁硼永磁的重稀土附着工艺

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1192657A (ja) * 1997-09-19 1999-04-06 Daicel Huels Ltd 金属粉体複合成形品用ポリアミド樹脂
JP2010222394A (ja) * 2009-03-19 2010-10-07 Ube Ind Ltd 磁性材樹脂複合体成形用ポリアミド樹脂組成物、磁性材樹脂複合材料、及び磁性材樹脂複合体

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1192657A (ja) * 1997-09-19 1999-04-06 Daicel Huels Ltd 金属粉体複合成形品用ポリアミド樹脂
JP2010222394A (ja) * 2009-03-19 2010-10-07 Ube Ind Ltd 磁性材樹脂複合体成形用ポリアミド樹脂組成物、磁性材樹脂複合材料、及び磁性材樹脂複合体

Cited By (1)

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

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