JP2020047722A - 永久磁石、回転電機、及び車 - Google Patents
永久磁石、回転電機、及び車 Download PDFInfo
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/02—Adaptations for driving vehicles, e.g. locomotives
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
- H01F1/0555—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together
- H01F1/0556—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together pressed
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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
- H01F1/0576—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 pressed, e.g. hot working
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/17—Stator cores with permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/003—Couplings; Details of shafts
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
- H02K7/1807—Rotary generators
- H02K7/1823—Rotary generators structurally associated with turbines or similar engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/70—Application in combination with
- F05D2220/76—Application in combination with an electrical generator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- General Engineering & Computer Science (AREA)
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- Inorganic Chemistry (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
実施形態では、低速から高速までの可変速駆動を行うモータに適用可能な永久磁石の例について説明する。図1は実施形態の永久磁石の磁気特性例を示す図であり、図2は参考例の永久磁石の磁気特性例を示す図である。なお、図1及び図2において、横軸は磁場Hを表し、縦軸は磁束密度Bを表す。
あるいは、選択した結晶粒の長径方向に対し垂直な方向を当該結晶粒の磁化容易軸方向と定義する。ここで、長径方向とは結晶粒の端部間を結ぶ直線を引いた際に長さが最も長くなる方向である。あるいは、選択した結晶粒に対し、結晶構造を同定し、その結晶構造から導かれる容易軸方向を当該結晶粒の磁化容易軸方向と定義する。このようにして同定した結晶粒の磁化容易軸方向と磁石の磁化容易軸方向の間の角度を上記の当該結晶粒の配向角(θn)とする。観察範囲内に結晶粒全体が確認できるものを計測し、一つの磁石に対し、100点程度測定しθnを求め、上記の方法から磁石の配向度を算出する。
第1の実施形態の永久磁石は、各種モータや発電機等の回転電機に使用することができる。また、可変磁束モータの固定磁石や可変磁石として使用することも可能である。第1の実施形態の永久磁石を用いることによって、各種のモータが構成される。第1の実施形態の永久磁石を可変磁束モータに適用する場合、可変磁束モータの構成やドライブシステムには、例えば特開2008−29148号公報や特開2008−43172号公報に開示されている技術を適用することができる。
急冷法により作製され、所望の組成及びNd2Fe14B型結晶相を有する母合金薄帯を150μm以下に粉砕した。得られた粉末をφ10mmの円柱状金型に充填した。粉末を充填した金型を雰囲気制御熱処理炉内に設置された油圧プレス機にセットし、真空中で2トンの圧力で圧縮した。その後、真空中で炉内を700℃まで加熱し、5分間保持した。加熱保持後、2℃/分の冷却速度で室温まで冷却し、圧縮成型体を得た。得られた成型体の円周を研削し上記加工率が24%となるように加工した後に、再びφ10mmの円柱状金型に入れ、再び雰囲気制御熱処理炉内に設置された油圧プレス機にセットし、真空中で炉内を700℃まで加熱しながら3トンの圧力で圧縮し、5分間保持した。加熱保持後、Arガスを導入し、5℃/分の冷却速度で室温まで冷却して磁石を得た。さらに、平均結晶粒径、配向度、残留磁化、リコイル透磁率、保磁力をそれぞれ測定した。結果を表1に示す。
急冷法により作製され、所望の組成及びNd2Fe14B型結晶相を有する母合金薄帯を150μm以下に粉砕した。得られた粉末をφ10mmの円柱状金型に充填した。粉末を充填した金型を雰囲気制御熱処理炉内に設置された油圧プレス機にセットし、真空中で2トンの圧力で圧縮した。その後、真空中で炉内を700℃まで加熱し、5分間保持した。加熱保持後、2℃/分の冷却速度で室温まで冷却し、圧縮成型体を得た。得られた成型体の円周を研削し上記加工率が5%となるように加工した後に、再びφ10mmの円柱状金型に入れ、再び雰囲気制御熱処理炉内に設置された油圧プレス機にセットし、真空中で炉内を730℃まで加熱しながら3トンの圧力で圧縮し、5分間保持した。加熱保持後、Arガスを導入し、5℃/分の冷却速度で室温まで冷却して磁石を得た。さらに、平均結晶粒径、配向度、残留磁化、リコイル透磁率、保磁力をそれぞれ測定した。結果を表1に示す。
急冷法により作製され、所望の組成及びNd2Fe14B型結晶相を有する母合金薄帯を150μm以下に粉砕した。得られた粉末をφ10mmの円柱状金型に充填した。粉末を充填した金型を雰囲気制御熱処理炉内に設置された油圧プレス機にセットし、真空中で2トンの圧力で圧縮した。その後、真空中で炉内を700℃まで加熱し、5分間保持した。加熱保持後、2℃/分の冷却速度で室温まで冷却し、圧縮成型体を得た。得られた成型体の円周を研削し上記加工率が50%となるように加工した後に、再びφ10mmの円柱状金型に入れ、再び雰囲気制御熱処理炉内に設置された油圧プレス機にセットし、真空中で炉内を780℃まで加熱しながら3トンの圧力で圧縮し、5分間保持した。加熱保持後、Arガスを導入し、5℃/分の冷却速度で室温まで冷却して磁石を得た。さらに、平均結晶粒径、配向度、残留磁化、リコイル透磁率、保磁力をそれぞれ測定した。結果を表1に示す。
Claims (11)
- 主相を有する結晶粒を具備する永久磁石であって、
前記結晶粒の平均結晶粒径が1.0μm以下であり、かつ、前記永久磁石の磁化容易軸方向への前記結晶粒の磁化容易軸方向の配向度が15%以上90%以下であり、
リコイル透磁率が1.13以上であり、残留磁化が0.8T以上1.16T未満であり、固有保磁力が850kA/m以上である、永久磁石。 - 前記主相は、R−Fe−B系磁石相(Rは、Nd、Pr、Dy、Tb、及びHoからなる群より選ばれる少なくとも一つの元素)である、請求項1に記載の永久磁石。
- 前記R−Fe−B系磁石相は、Nd2Fe14B型結晶相である、請求項2に記載の永久磁石。
- 粒界相をさらに具備し、
前記粒界相のR元素の濃度は、前記主相のR元素の濃度よりも高い、請求項2又は請求項3に記載の永久磁石。 - 前記主相は、R−Co系磁石相(Rは希土類元素からなる群より選ばれる少なくとも一つの元素)である、請求項1に記載の永久磁石。
- 前記R−Co系磁石相は、Sm2Co17型結晶相である、請求項5に記載の永久磁石。
- 粒界相をさらに具備し、
前記粒界相のR元素の濃度は、前記主相のR元素の濃度よりも高い、請求項5又は請求項6に記載の永久磁石。 - ステータと、
ロータと、を具備し、
前記ステータ又は前記ロータは、請求項1ないし請求項7のいずれか一項に記載の永久磁石を有する、回転電機。 - 前記ロータは、シャフトを介してタービンに接続されている、請求項8に記載の回転電機。
- 請求項8に記載の回転電機を具備する、車。
- 前記ロータは、シャフトに接続されており、
前記シャフトに回転が伝達される、請求項10に記載の車。
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