JP2005341696A - Axial gap type rotating electric machine - Google Patents

Axial gap type rotating electric machine Download PDF

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JP2005341696A
JP2005341696A JP2004156292A JP2004156292A JP2005341696A JP 2005341696 A JP2005341696 A JP 2005341696A JP 2004156292 A JP2004156292 A JP 2004156292A JP 2004156292 A JP2004156292 A JP 2004156292A JP 2005341696 A JP2005341696 A JP 2005341696A
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permanent magnet
rotor
stator
axial gap
gap type
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JP4432616B2 (en
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Yutaro Kaneko
雄太郎 金子
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Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an axial gap type rotating electric machine that can increase the generated torque, by obtaining magnet torque and reluctance torque and adding these. <P>SOLUTION: The axial gap type rotating electric machine 1 comprises a rotor 3 having a rotor core 7, composed of a ferromagnet and a permanent magnet 8 and a stator 4 having stator teeth 11 and a stator coil 10 wound to the stator teeth 11. The rotor 3 and the stator 4 are arranged in the axial direction, and at least a part of a face that opposes the stator 4 of the permanent magnet 8 is covered with the ferromagnet. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、強磁性体からなる回転子コアと永久磁石とを有する回転子と、固定子ティース部と固定子ティース部に巻きつけた、固定子コイルとを有する固定子と、を有し、回転子と固定子とがアキシャル方向に配設されたアキシャルギャップ型回転電機に関するものである。   The present invention comprises a rotor having a rotor core made of a ferromagnetic material and a permanent magnet, and a stator having a stator teeth portion and a stator coil wound around the stator teeth portion, The present invention relates to an axial gap type rotating electrical machine in which a rotor and a stator are arranged in an axial direction.

従来、アキシャルギャップ型回転電機の回転子の構成について、回転子のロータ円盤および回転軸を非磁性体材料で一体に形成し、円柱形状に形成した永久磁石を、回転子のロータ円盤に貫通して埋め込むことが知られている（例えば、特許文献１参照）。このように回転子を一体強固に形成することで、高速回転時に永久磁石が遠心力により飛散するのを防止するようにしている。
特開平５−２６８７５４号公報 Conventionally, with regard to the configuration of the rotor of the axial gap type rotating electrical machine, the rotor rotor disk and the rotating shaft are integrally formed of a non-magnetic material, and a permanent magnet formed in a cylindrical shape is passed through the rotor rotor disk. It is known to be embedded (see, for example, Patent Document 1). By thus forming the rotor integrally and firmly, the permanent magnet is prevented from being scattered by centrifugal force during high-speed rotation.
Japanese Patent Laid-Open No. 5-268754

上述したアキシャルギャップ型回転電機において、回転子のロータ円盤を非磁性体の材料により形成すると、その発生トルクはマグネットトルクだけとなる。発生トルクの増大のためには、マグネットトルクの他、リラクタンストルクも得るとよい。そこで、ロータ円盤を強磁性体の材料により形成し、リラクタンストルクも得ることが考えられる。しかし、上述した従来のアキシャルギャップ型回転電機にあっては、以下に説明するような問題を生ずる。つまり、ロータ円盤の材質を非磁性体材料から強磁性体材料に変更すると、永久磁石間の漏れ磁束、特に周方向に隣り合う永久磁石同士の漏れ磁束が、ロータ円盤を介して多くなり、ロータ円盤を非磁性体材料で形成する場合よりも、かえって発生トルクが減少していしまうという問題があった。   In the axial gap type rotating electrical machine described above, when the rotor disk of the rotor is made of a non-magnetic material, the generated torque is only the magnet torque. In order to increase the generated torque, it is preferable to obtain reluctance torque in addition to magnet torque. Therefore, it is conceivable that the rotor disk is made of a ferromagnetic material to obtain reluctance torque. However, the above-described conventional axial gap type rotating electric machine has the following problems. That is, if the material of the rotor disk is changed from a non-magnetic material to a ferromagnetic material, the leakage magnetic flux between the permanent magnets, in particular, the leakage magnetic flux between the permanent magnets adjacent in the circumferential direction increases through the rotor disk, and the rotor There is a problem that the generated torque is reduced rather than the case where the disk is made of a non-magnetic material.

本発明の目的は上述した問題点を解消して、マグネットトルクおよびリラクタンストルクを得て、これらを合算して発生トルクを増大させることができるアキシャルギャップ型回転電機を提供しようとするものである。   An object of the present invention is to provide an axial gap type rotating electrical machine that can solve the above-described problems, obtain a magnet torque and a reluctance torque, and add them to increase the generated torque.

本発明のアキシャルギャップ型回転電機は、強磁性体からなる回転子コアと永久磁石とを有する回転子と、固定子ティース部と固定子ティース部に巻きつけた固定子コイルとを有する固定子と、を有し、回転子と固定子とがアキシャル方向に配設されたアキシャルギャップ型回転電機において、永久磁石の固定子と対向する面の少なくとも一部を強磁性体で覆ったことを特徴とするものである。   An axial gap type rotating electrical machine of the present invention includes a rotor having a rotor core made of a ferromagnetic material and a permanent magnet, a stator having a stator teeth portion and a stator coil wound around the stator teeth portion. In the axial gap type rotating electrical machine in which the rotor and the stator are arranged in the axial direction, at least part of the surface of the permanent magnet facing the stator is covered with a ferromagnetic material. To do.

本発明のアキシャルギャップ型回転電機によれば、永久磁石の固定子と対向する面の少なくとも一部を強磁性体で覆ったことで、マグネットトルクとリラクタンストルクとを得られ、発生トルクを大幅に増加させることが可能である。   According to the axial gap type rotating electrical machine of the present invention, the magnet torque and the reluctance torque can be obtained by covering at least a part of the surface facing the stator of the permanent magnet with the ferromagnetic material, and the generated torque is greatly increased. It is possible to increase.

以下に、この発明の実施の形態を、図面に基づき詳細に説明する。
図１は本発明のアキシャルギャップ型回転電機の一例を説明するための図である。図１に示す例において、回転軸２と、回転軸２に固定された円盤状の回転子３と、回転子３に対向して設けられた円盤状の固定子４とを、外周ケース５−１及びサイドケース５−２からなるケース５内に収納して、アキシャルギャップ型回転電機１を構成している。 Embodiments of the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a view for explaining an example of an axial gap type rotating electrical machine of the present invention. In the example shown in FIG. 1, a rotating shaft 2, a disk-shaped rotor 3 fixed to the rotating shaft 2, and a disk-shaped stator 4 provided to face the rotor 3 are connected to an outer case 5- The axial gap type rotating electrical machine 1 is configured by being housed in a case 5 including a first case 1 and a side case 5-2.

本例において、回転軸２は、ベアリング６−１、６−２を介してサイドケース５−２に回転自在に装着されている。また、回転子３は、円盤状の回転子コア７と、回転子コア７の周方向に複数個設けられた永久磁石８と、から構成されている。回転子コア７は、電磁鋼板の積層体、鉄粉等の粉体を成型した圧粉コア等から構成されている。さらに、固定子４は、サイドケース５−２に設けられた円筒形状の固定子バックコア部９に、固定子コイル１０を巻回した固定子ティース部１１を複数個、等間隔で円周状に配置して構成されている。さらにまた、回転軸２には回転センサ１２が設けられている。   In this example, the rotating shaft 2 is rotatably mounted on the side case 5-2 via bearings 6-1, 6-2. The rotor 3 includes a disc-shaped rotor core 7 and a plurality of permanent magnets 8 provided in the circumferential direction of the rotor core 7. The rotor core 7 is composed of a laminated body of electromagnetic steel sheets, a dust core obtained by molding a powder such as iron powder, and the like. Further, the stator 4 has a plurality of stator teeth portions 11 each having a stator coil 10 wound around a cylindrical stator back core portion 9 provided in the side case 5-2. It is arranged and arranged. Furthermore, the rotation shaft 2 is provided with a rotation sensor 12.

図１に示すアキシャルギャップ型回転電機１において、回転子３は、固定子４から与えられる回転磁束に対して、永久磁石８に反力を発生させ、回転軸２を中心に回転するように構成されている。この永久磁石８は、隣接する永久磁石の磁極は互いに相違するよう配置されている。ここで、回転子３と固定子４の間にはエアギャップと呼ばれる隙間１３が存在し、互いに接触することはない。   In the axial gap type rotating electrical machine 1 shown in FIG. 1, the rotor 3 is configured to generate a reaction force in the permanent magnet 8 with respect to the rotating magnetic flux applied from the stator 4 and rotate around the rotating shaft 2. Has been. The permanent magnets 8 are arranged so that the magnetic poles of adjacent permanent magnets are different from each other. Here, a gap 13 called an air gap exists between the rotor 3 and the stator 4 and does not contact each other.

本発明の特徴は、上述した構成のアキシャルギャップ型回転電機１において、永久磁石８の固定子４と対向する面の少なくとも一部（全部でも良い）を強磁性体で覆った点にある。以下、その具体例を説明する。   A feature of the present invention resides in that in the axial gap type rotating electrical machine 1 having the above-described configuration, at least a part (or all) of the surface of the permanent magnet 8 facing the stator 4 is covered with a ferromagnetic material. Specific examples will be described below.

図２は本発明のアキシャルギャップ型回転電機における回転子の一例を説明するための図であり、図３は図２においてＡ−Ａ線に沿った断面を展開して示す図である。図２及び図３に示す例において、回転子３は、第１の電磁鋼板を積層してなる回転子コア７上に、８極の永久磁石８（ここでは回転子４に対向する面がＳ極のものを８Ｓ、Ｎ極のものを８Ｎとも記載する）を、無着磁領域２１を介して円周状等間隔に配置して構成されている。本例の特徴は、各永久磁石８の固定子４と対向する面に、内周側から外周側へと貫通する凹部２２を設け、その凹部２２に、第２の電磁鋼板を積層してなる強磁性体層２３を設けることで、永久磁石８の固定子４と対向する面の少なくとも一部を強磁性体で覆った点である。   FIG. 2 is a view for explaining an example of a rotor in the axial gap type rotating electric machine according to the present invention, and FIG. 3 is a diagram showing a developed section taken along line AA in FIG. In the example shown in FIGS. 2 and 3, the rotor 3 has an eight-pole permanent magnet 8 (here, the surface facing the rotor 4 is S on a rotor core 7 formed by laminating first electromagnetic steel plates. The poles are described as 8S and N poles are also described as 8N) with the non-magnetized region 21 arranged at equal circumferential intervals. The feature of this example is that a concave portion 22 penetrating from the inner peripheral side to the outer peripheral side is provided on the surface of each permanent magnet 8 facing the stator 4, and the second electromagnetic steel plate is laminated on the concave portion 22. By providing the ferromagnetic layer 23, at least a part of the surface of the permanent magnet 8 facing the stator 4 is covered with a ferromagnetic material.

図２及び図３に示す例においては、永久磁石８の着磁方向は、各永久磁石８におけるＮ極からＳ極に向く図中矢印で示す方向となる。また、強磁性体層２３を構成する第２の電磁鋼板の積層方向が着磁方向と同じで、永久磁石８の磁束の流れを妨げる方向となっているが、第２の電磁鋼板を積層してなる強磁性体層２３の厚みが小さいため、問題にならない。本例では、永久磁石８の固定子４側の面に設けた凹部２２に強磁性体層２３を配設して、永久磁石８の一部を強磁性体で覆うことで、マグネットトルクとリラクタンストルクを得ることができるため、発生トルクの増大が可能となる。なお、本例において、回転子コア７を形成する第１の電磁鋼板を一般鋼板に置き換えることで、コスト削減が可能である。   In the example shown in FIGS. 2 and 3, the magnetization direction of the permanent magnet 8 is the direction indicated by the arrow in the figure from the N pole to the S pole in each permanent magnet 8. In addition, the lamination direction of the second electromagnetic steel sheet constituting the ferromagnetic layer 23 is the same as the magnetization direction and is a direction that obstructs the flow of magnetic flux of the permanent magnet 8. This is not a problem because the thickness of the ferromagnetic layer 23 is small. In this example, the ferromagnetic layer 23 is disposed in the concave portion 22 provided on the surface of the permanent magnet 8 on the stator 4 side, and a part of the permanent magnet 8 is covered with the ferromagnetic material so that the magnet torque and the reluctance can be obtained. Since the torque can be obtained, the generated torque can be increased. In addition, in this example, cost reduction is possible by replacing the 1st electromagnetic steel plate which forms the rotor core 7 with a general steel plate.

図４は本発明のアキシャルギャップ型回転電機における回転子の他の例を説明するための図であり、図３と同様の部分を展開して示した図である。図４に示す例では、第１の電磁鋼板を積層してなる回転子コア７上に、扇形で板状の第１の永久磁石２４を、無着磁領域２１を介して円周上等間隔に配設し、無着磁領域２１上隣り合う第１の永久磁石２４にまたがって、着磁方向が第１の永久磁石２４と９０度異なる第２の永久磁石２５を配設することで、凹部２２を有する永久磁石８を形成している。そして、凹部２２に第２の電磁鋼板を積層してなる強磁性体層２３を設けることで、永久磁石８の固定子４と対向する面の少なくとも一部を強磁性体で覆った本発明の回転子３を構成している。   FIG. 4 is a view for explaining another example of the rotor in the axial gap type rotating electric machine according to the present invention, and is a view in which the same portion as FIG. 3 is developed. In the example shown in FIG. 4, fan-shaped plate-like first permanent magnets 24 are arranged on the rotor core 7 formed by laminating the first electromagnetic steel plates via the non-magnetized region 21 at equal intervals on the circumference. And a second permanent magnet 25 whose magnetization direction is 90 degrees different from that of the first permanent magnet 24 across the first permanent magnets 24 adjacent to each other on the non-magnetized region 21. A permanent magnet 8 having a recess 22 is formed. And by providing the ferromagnetic material layer 23 formed by laminating the second electromagnetic steel plate in the recess 22, at least a part of the surface of the permanent magnet 8 facing the stator 4 is covered with the ferromagnetic material. A rotor 3 is configured.

図４に示す例においては、図２及び図３に示す効果に加えて、凹部２２を有する永久磁石８を第１の永久磁石２４と第２の永久磁石２５の複数の磁石から構成することで、より容易かつ安価に凹部２２を有する永久磁石８を製作することができる。   In the example shown in FIG. 4, in addition to the effects shown in FIGS. 2 and 3, the permanent magnet 8 having the recess 22 is constituted by a plurality of magnets of a first permanent magnet 24 and a second permanent magnet 25. The permanent magnet 8 having the recess 22 can be manufactured more easily and inexpensively.

図５は本発明のアキシャルギャップ型回転電機における回転子のさらに他の例を説明するための図であり、図３と同様の部分を展開して示した図である。図５に示す例では、第１の電磁鋼板を積層してなる回転コア７上に、図３に示した例と同様に製作した凹部２２を有する永久磁石８を、第２の電磁鋼板を積層してなる強磁性体層２６を介して、円周状等間隔に配設している。さらに、本例では、永久磁石８と強磁性体層２６との間に、非磁性体層としてのエアーギャップ２７を設けている。そして、凹部２２に第３の電磁鋼板を積層してなる強磁性体層２３を設けることで、永久磁石８の固定子４と対向する面の少なくとも一部を強磁性体で覆った本発明の回転子３を構成している。   FIG. 5 is a view for explaining still another example of the rotor in the axial gap type rotating electric machine according to the present invention, and is a view in which the same portion as FIG. 3 is developed. In the example shown in FIG. 5, the permanent magnet 8 having the concave portion 22 manufactured in the same manner as the example shown in FIG. 3 is laminated on the rotating core 7 formed by laminating the first electromagnetic steel plates. The magnetic layers 26 are arranged at equal intervals around the circumference. Furthermore, in this example, an air gap 27 is provided as a nonmagnetic layer between the permanent magnet 8 and the ferromagnetic layer 26. And by providing the ferromagnetic material layer 23 formed by laminating the third electromagnetic steel plate in the recess 22, at least a part of the surface of the permanent magnet 8 facing the stator 4 is covered with the ferromagnetic material. A rotor 3 is configured.

図５に示す例においては、図２及び図３に示す効果に加えて、永久磁石８と強磁性体層２６との間に非磁性体としてのエアギャップ２７を設けることで、よりリラクタンストルクを得ることができる。なお、非磁性体層は非磁性体の材料から構成されていれば、エアーギャップ２７以外の構成をもとることができる。   In the example shown in FIG. 5, in addition to the effects shown in FIGS. 2 and 3, by providing an air gap 27 as a non-magnetic material between the permanent magnet 8 and the ferromagnetic layer 26, the reluctance torque can be further increased. Can be obtained. In addition, if the nonmagnetic layer is made of a nonmagnetic material, a configuration other than the air gap 27 can be adopted.

図６は本発明のアキシャルギャップ型回転電機における回転子のさらに他の例を説明するための図であり、図３と同様の部分を展開して示した図である。図６に示す例では、第１の電磁鋼板を積層してなる回転子コア７上に、扇形で板状の第１の永久磁石２４を、第２の電磁鋼板を積層してなる強磁性体層２６を介して、円周状等間隔に配設している。さらに、本例では、永久磁石８と強磁性体層２６との間に、非磁性体層としてのエアーギャップ２７を設けている。さらにまた、エアーギャップ２７上に、着磁方向が第１の永久磁石２４と９０度異なる第２の永久磁石２５を第２の電磁鋼板を積層してなる強磁性体層２６を介して配設することで、凹部２２を有する永久磁石８を形成している。そして、凹部２２に第３の電磁鋼板を積層してなる強磁性体層２３を設けることで、永久磁石８の固定子４と対向する面の少なくとも一部を強磁性体で覆った本発明の回転子３を構成している。   FIG. 6 is a view for explaining still another example of the rotor in the axial gap type rotating electrical machine according to the present invention, and is a view in which the same portion as FIG. 3 is developed. In the example shown in FIG. 6, a fan-shaped plate-like first permanent magnet 24 and a ferromagnetic material formed by laminating a second electromagnetic steel sheet are arranged on a rotor core 7 obtained by laminating a first electromagnetic steel sheet. The layers 26 are arranged at equal intervals around the circumference. Furthermore, in this example, an air gap 27 is provided as a nonmagnetic layer between the permanent magnet 8 and the ferromagnetic layer 26. Furthermore, a second permanent magnet 25 whose magnetization direction is 90 degrees different from that of the first permanent magnet 24 is disposed on the air gap 27 via a ferromagnetic layer 26 formed by laminating a second electromagnetic steel sheet. By doing so, the permanent magnet 8 having the recess 22 is formed. And by providing the ferromagnetic material layer 23 formed by laminating the third electromagnetic steel plate in the recess 22, at least a part of the surface of the permanent magnet 8 facing the stator 4 is covered with the ferromagnetic material. A rotor 3 is configured.

図６に示す例においては、図２及び図３に示す効果に加えて、凹部２２を有する永久磁石８を第１の永久磁石２４と第２の永久磁石２５の複数の磁石から構成することで、より容易かつ安価に凹部２２を有する永久磁石８を製作することができるとともに、第１の永久磁石２４と強磁性体層２６との間に非磁性体としてのエアギャップ２７を設けることで、よりリラクタンストルクを得ることができる。   In the example shown in FIG. 6, in addition to the effects shown in FIGS. 2 and 3, the permanent magnet 8 having the recess 22 is constituted by a plurality of magnets of a first permanent magnet 24 and a second permanent magnet 25. The permanent magnet 8 having the recess 22 can be manufactured more easily and inexpensively, and an air gap 27 as a nonmagnetic material is provided between the first permanent magnet 24 and the ferromagnetic layer 26. More reluctance torque can be obtained.

図７は本発明のアキシャルギャップ型回転電機における回転子のさらに他の例を説明するための図であり、図３と同様の部分を展開して示した図である。図７に示す例では、第１の電磁鋼板を積層してなる回転子コア７の上に、扇形で板状の第１の永久磁石２４を、第２の電磁鋼板を積層してなる強磁性体層２６及びエアーギャップ２７を介して、円周状等間隔に配設している。さらに、本例では、第１の永久磁石２４、エアギャップ２７及び強磁性体層２６の上に、第１の電磁鋼板を積層してなる強磁性体層２８を配設し、さらにその上に、第１の永久磁石２４と同じ形状の第２の永久磁石２５を、第２の電磁鋼板を積層してなる強磁性体層２６及びエアギャップ２７を介して、円周状等間隔に配設している。さらにまた、本例では、第２の永久磁石２５上であってエアギャップ２７の間に、第３の電磁鋼板を積層してなる強磁性体層２９により第２の永久磁石２５の表面全体を覆うことで、永久磁石８の固定子４と対向する面の全体を強磁性体で覆った本発明の回転子３を構成している。   FIG. 7 is a view for explaining still another example of the rotor in the axial gap type rotating electric machine according to the present invention, and is a view in which the same portion as FIG. 3 is developed. In the example shown in FIG. 7, a fan-shaped plate-shaped first permanent magnet 24 and a second magnetic steel sheet are laminated on the rotor core 7 formed by laminating the first magnetic steel sheets. The body layers 26 and the air gaps 27 are arranged at equal circumferential intervals. Further, in this example, a ferromagnetic layer 28 formed by laminating a first electromagnetic steel sheet is disposed on the first permanent magnet 24, the air gap 27, and the ferromagnetic layer 26, and further thereon. The second permanent magnets 25 having the same shape as the first permanent magnets 24 are arranged at equal circumferential intervals via the ferromagnetic layer 26 formed by laminating the second electromagnetic steel plates and the air gap 27. doing. Furthermore, in this example, the entire surface of the second permanent magnet 25 is covered by the ferromagnetic layer 29 formed by laminating the third electromagnetic steel plate on the second permanent magnet 25 and between the air gaps 27. By covering, the rotor 3 of the present invention is configured in which the entire surface of the permanent magnet 8 facing the stator 4 is covered with a ferromagnetic material.

図７に示す例においては、図２及び図３に示す効果に加えて、一極の永久磁石８を第１の永久磁石２４と第２の永久磁石２５と厚さ方向に複数個に分割して構成することで、よりリラクタンストルクを得ることができる。   In the example shown in FIG. 7, in addition to the effects shown in FIGS. 2 and 3, the unipolar permanent magnet 8 is divided into a plurality of first permanent magnets 24 and second permanent magnets 25 in the thickness direction. Thus, a reluctance torque can be obtained more.

図８は本発明のアキシャルギャップ型回転電機の他の例を説明するための図である。図８に示す例において、図１に示す例と同一の部材には同一の符号を付し、その説明を省略する。図８に示す例において図１に示す例と異なる点は、図１に示した例では、１つの回転子３と１つの固定子４との組合せであるのに対し、図８に示す例では、１つの回転子３の両側に１つの回転子３を挟むように２つの固定子４を設けた点である。そのため、回転子３の両表面が固定子４と対向する面となるため、永久磁石８を回転子３の両表面に露出して設ける必要がある。以下、図８に示す構成のアキシャルギャップ型回転電機１に好適に用いることのできる本発明の回転子３について、さらに具体的に説明する。   FIG. 8 is a view for explaining another example of the axial gap type rotating electrical machine of the present invention. In the example shown in FIG. 8, the same members as those in the example shown in FIG. The example shown in FIG. 8 is different from the example shown in FIG. 1 in that the example shown in FIG. 1 is a combination of one rotor 3 and one stator 4, whereas the example shown in FIG. The point is that two stators 4 are provided so as to sandwich one rotor 3 on both sides of one rotor 3. Therefore, since both surfaces of the rotor 3 are surfaces facing the stator 4, it is necessary to provide the permanent magnets 8 exposed on both surfaces of the rotor 3. Hereinafter, the rotor 3 of the present invention that can be suitably used for the axial gap type rotating electrical machine 1 having the configuration shown in FIG. 8 will be described more specifically.

図９は本発明のアキシャルギャップ型回転電機における回転子のさらに他の例を説明するための図であり、図３と同様の部分を展開して示した図である。図９に示す例では、第１の電磁鋼板を積層してなる回転コア７内に、両表面の同じ位置に凹部２２を有する永久磁石８を、第２の電磁鋼板を積層してなる強磁性体層２６を介して、円周状等間隔に配設している。さらに、本例では、永久磁石８と強磁性体層２６との間に、非磁性体層としてのエアーギャップ２７を設けている。そして、両表面の凹部２２に第２の電磁鋼板を積層してなる強磁性体層２３を設けることで、永久磁石の固定子４と対向する両表面のそれぞれにおいて少なくとも一部を強磁性体で覆った本発明の回転子３を構成している。本例では、図５で得られる効果と同様の効果を得ることができる。   FIG. 9 is a view for explaining still another example of the rotor in the axial gap type rotating electric machine according to the present invention, and is a view in which the same portion as FIG. 3 is developed. In the example shown in FIG. 9, a permanent magnet 8 having a recess 22 at the same position on both surfaces in a rotating core 7 formed by laminating a first electromagnetic steel plate, and a ferromagnetic obtained by laminating a second electromagnetic steel plate. The body layers 26 are arranged at equal circumferential intervals. Furthermore, in this example, an air gap 27 is provided as a nonmagnetic layer between the permanent magnet 8 and the ferromagnetic layer 26. Then, by providing the ferromagnetic material layer 23 formed by laminating the second electromagnetic steel plates in the concave portions 22 on both surfaces, at least a part of each surface facing the stator 4 of the permanent magnet is made of a ferromagnetic material. The covered rotor 3 of this invention is comprised. In this example, the same effect as that obtained in FIG. 5 can be obtained.

図１０は本発明のアキシャルギャップ型回転電機における回転子のさらに他の例を説明するための図であり、図３と同様の部分を展開して示した図である。図１０に示す例では、第１の電磁鋼板を積層してなる回転コア７内に、扇形で板状の第１の永久磁石２４を円周状等間隔に配設し、回転コア７上隣り合う第１の永久磁石２４の間の両表面に、着磁方向が第１の永久磁石２４と９０度異なる第２の永久磁石２５を配設することで、両表面に凹部２２を有する永久磁石８を形成している。そして、両表面の凹部２２に第２の電磁鋼板を積層してなる強磁性体層２３を設けることで、永久磁石８の固定子４と対向する面のそれぞれにおいて少なくとも一部を強磁性体で覆った本発明の回転子３を構成している。本例では、図４で得られる効果と同様の効果を得ることができる。   FIG. 10 is a view for explaining still another example of the rotor in the axial gap type rotating electric machine according to the present invention, and is a view in which the same portion as FIG. 3 is developed. In the example shown in FIG. 10, fan-shaped plate-like first permanent magnets 24 are arranged at equal intervals in the rotating core 7 formed by laminating the first electromagnetic steel plates, and adjacent to the rotating core 7. Permanent magnets having concave portions 22 on both surfaces by disposing second permanent magnets 25 whose magnetization direction is 90 degrees different from that of first permanent magnets 24 on both surfaces between matching first permanent magnets 24. 8 is formed. And by providing the ferromagnetic material layer 23 formed by laminating the second electromagnetic steel plates in the concave portions 22 on both surfaces, at least a part of each of the surfaces facing the stator 4 of the permanent magnet 8 is made of a ferromagnetic material. The covered rotor 3 of this invention is comprised. In this example, the same effect as that obtained in FIG. 4 can be obtained.

図１１は本発明のアキシャルギャップ型回転電機における回転子のさらに他の例を説明するための図であり、図３と同様の部分を展開して示した図である。図１１に示す例では、第１の電磁鋼板を積層してなる回転コア３７の両表面に、凹部２２を有する永久磁石８を、第２の電磁鋼板を積層してなる強磁性体層２６を介して、円周状等間隔に配設している。さらに、本例では、永久磁石８と強磁性体層２６との間に、非磁性体層としてのエアーギャップ２７を設けている。そして、凹部２２に第３の電磁鋼板を積層してなる強磁性体層２３を設けることで、永久磁石８の固定子４と対向する面の少なくとも一部を強磁性体で覆った本発明の回転子３を構成している。本例では、図５で得られる効果に加えて、電磁鋼板として３種類の形状のものを使用することで、永久磁石８の固定が容易になる。   FIG. 11 is a view for explaining still another example of the rotor in the axial gap type rotating electric machine according to the present invention, and is a view in which the same portion as FIG. 3 is developed. In the example shown in FIG. 11, the permanent magnet 8 having the recess 22 is formed on both surfaces of the rotating core 37 formed by laminating the first electromagnetic steel plates, and the ferromagnetic layer 26 formed by laminating the second electromagnetic steel plates. Are arranged at equal circumferential intervals. Furthermore, in this example, an air gap 27 is provided as a nonmagnetic layer between the permanent magnet 8 and the ferromagnetic layer 26. And by providing the ferromagnetic material layer 23 formed by laminating the third electromagnetic steel plate in the recess 22, at least a part of the surface of the permanent magnet 8 facing the stator 4 is covered with the ferromagnetic material. A rotor 3 is configured. In this example, in addition to the effects obtained in FIG. 5, the permanent magnet 8 can be easily fixed by using three types of electromagnetic steel sheets.

図１２は本発明のアキシャルギャップ型回転電機における回転子のさらに他の例を説明するための図であり、図３と同様の部分を展開して示した図である。図１２に示す例では、第１の電磁鋼板を積層してなる回転コア７内に、両表面の回転方向に沿ってずれた位置に凹部２２を有する永久磁石８を、第２の電磁鋼板を積層してなる強磁性体層２６を介して、円周状等間隔に配設している。さらに、本例では、永久磁石８と強磁性体層２６との間に、非磁性体層としてのエアーギャップ２７を設けている。そして、両表面の回転方向に沿ってずれた位置に設けた凹部２２に第２の電磁鋼板を積層してなる強磁性体層２３を設けることで、永久磁石８の固定子４と対向する両表面のそれぞれにおいて少なくとも一部を強磁性体で覆った本発明の回転子３を構成している。本例では、図９で得られる効果に加えて、永久磁石８の両表面に設けた凹部２２の位置を回転方向にずらすことで、コギングトルクを低減することができる。   FIG. 12 is a view for explaining still another example of the rotor in the axial gap type rotating electric machine according to the present invention, and is a view in which the same portion as FIG. 3 is developed. In the example shown in FIG. 12, a permanent magnet 8 having a recess 22 at a position shifted along the rotational direction of both surfaces in a rotating core 7 formed by laminating a first electromagnetic steel sheet, and a second electromagnetic steel sheet. The laminated ferromagnetic material layers 26 are arranged at equal circumferential intervals. Furthermore, in this example, an air gap 27 is provided as a nonmagnetic layer between the permanent magnet 8 and the ferromagnetic layer 26. And by providing the ferromagnetic material layer 23 which laminates | stacks a 2nd electromagnetic steel plate in the recessed part 22 provided in the position shifted along the rotation direction of both surfaces, both facing the stator 4 of the permanent magnet 8 is provided. The rotor 3 of the present invention is configured such that at least a part of each surface is covered with a ferromagnetic material. In this example, in addition to the effects obtained in FIG. 9, the cogging torque can be reduced by shifting the positions of the recesses 22 provided on both surfaces of the permanent magnet 8 in the rotational direction.

本発明は上述した実施例にのみ限定されるものではなく、幾多の変形、変更が可能である。例えば、上述した実施例では回転電機と述べているが、それは電動機でも発電機でもかまわない。また、上述した実施例では、８極であるが、他の極数でもかまわない。さらに、上述した実施例では、回転子コア７を構成する強磁性体として電磁鋼板または一般鋼板を例示しているが、圧粉コアでも構成することが可能である。さらにまた、上述した実施例では、回転子３が１つ、固定子４が１つの場合と、回転子３が１つ、固定子４が２つの場合の２通りを述べているが、例えば回転子３が２つ、固定子４が１つの場合、回転子３が２つ、固定子４が３つの場合、回転子３が３つ、固定子４が２つの場合等、それら以外の組合せでもかまわない。   The present invention is not limited to the above-described embodiments, and many variations and modifications are possible. For example, in the above-described embodiment, the rotating electric machine is described, but it may be an electric motor or a generator. In the embodiment described above, there are 8 poles, but other pole numbers may be used. Furthermore, in the Example mentioned above, although the electromagnetic steel plate or the general steel plate is illustrated as a ferromagnetic body which comprises the rotor core 7, it is also possible to comprise also with a dust core. Furthermore, in the above-described embodiment, there are described two cases where there is one rotor 3 and one stator 4 and one rotor 3 and two stators 4. Other combinations such as two rotors 3 and one stator 4, two rotors 3 and three stators 4, three rotors 3 and two stators 4, etc. It doesn't matter.

本発明のアキシャルギャップ型回転電機は、回転軸に沿って少なくとも一対のステータとロータとが対向して配置されるアキシャルギャップ型回転電機において、マグネットトルクおよびリラクタンストルクを得て、これらを合算して発生トルクを増大させる用途に好適に使用することができる。   An axial gap type rotating electrical machine according to the present invention is an axial gap type rotating electrical machine in which at least a pair of stators and a rotor are arranged so as to face each other along a rotation axis, and obtains a magnet torque and a reluctance torque and adds them together. It can be suitably used for applications that increase the generated torque.

本発明のアキシャルギャップ型回転電機の一例を説明するための図である。It is a figure for demonstrating an example of the axial gap type rotary electric machine of this invention. 本発明のアキシャルギャップ型回転電機における回転子の一例を説明するための図である。It is a figure for demonstrating an example of the rotor in the axial gap type rotary electric machine of this invention. 図２においてＡ−Ａ線に沿った断面を展開して示す図である。It is a figure which expands and shows the cross section along the AA in FIG. 本発明のアキシャルギャップ型回転電機における回転子の他の例を説明するための図である。It is a figure for demonstrating the other example of the rotor in the axial gap type rotary electric machine of this invention. 本発明のアキシャルギャップ型回転電機における回転子のさらに他の例を説明するための図である。It is a figure for demonstrating the further another example of the rotor in the axial gap type rotary electric machine of this invention. 本発明のアキシャルギャップ型回転電機における回転子のさらに他の例を説明するための図である。It is a figure for demonstrating the further another example of the rotor in the axial gap type rotary electric machine of this invention. 本発明のアキシャルギャップ型回転電機における回転子のさらに他の例を説明するための図である。It is a figure for demonstrating the further another example of the rotor in the axial gap type rotary electric machine of this invention. 本発明のアキシャルギャップ型回転電機の他の例を説明するための図である。It is a figure for demonstrating the other example of the axial gap type rotary electric machine of this invention. 本発明のアキシャルギャップ型回転電機における回転子のさらに他の例を説明するための図である。It is a figure for demonstrating the further another example of the rotor in the axial gap type rotary electric machine of this invention. 本発明のアキシャルギャップ型回転電機における回転子のさらに他の例を説明するための図である。It is a figure for demonstrating the further another example of the rotor in the axial gap type rotary electric machine of this invention. 本発明のアキシャルギャップ型回転電機における回転子のさらに他の例を説明するための図である。It is a figure for demonstrating the further another example of the rotor in the axial gap type rotary electric machine of this invention. 本発明のアキシャルギャップ型回転電機における回転子のさらに他の例を説明するための図である。It is a figure for demonstrating the further another example of the rotor in the axial gap type rotary electric machine of this invention.

符号の説明Explanation of symbols

１ アキシャルギャップ型回転電機
２ 回転軸
３ 回転子
４ 固定子
５ ケース
５−１ 外周ケース
５−２ サイドケース
６−１、６−２ ベアリング
７ 回転子コア
８、８Ｓ、８Ｎ 永久磁石
９ 固定子バックコア部
１０ 固定子コイル
１１ 固定子ティース部
１２ 回転センサ
１３ 隙間
２１ 無着磁領域
２２ 凹部
２３、２６、２８、２９ 強磁性体層
２４ 第１の永久磁石
２５ 第２の永久磁石
２７ エアギャップ DESCRIPTION OF SYMBOLS 1 Axial gap type rotary electric machine 2 Rotating shaft 3 Rotor 4 Stator 5 Case 5-1 Outer case 5-2 Side case 6-1, 6-2 Bearing 7 Rotor core 8, 8S, 8N Permanent magnet 9 Stator back Core part 10 Stator coil 11 Stator tooth part 12 Rotation sensor 13 Gap 21 Non-magnetized area 22 Recess 23, 26, 28, 29 Ferromagnetic layer 24 First permanent magnet 25 Second permanent magnet 27 Air gap

Claims (7)

強磁性体からなる回転子コアと永久磁石とを有する回転子と、固定子ティース部と固定子ティース部に巻きつけた固定子コイルとを有する固定子と、を有し、回転子と固定子とがアキシャル方向に配設されたアキシャルギャップ型回転電機において、永久磁石の固定子と対向する面の少なくとも一部を強磁性体で覆ったことを特徴とするアキシャルギャップ型回転電機。   A rotor having a rotor core made of a ferromagnetic material and a permanent magnet; and a stator having a stator teeth portion and a stator coil wound around the stator teeth portion. An axial gap type rotating electrical machine, wherein at least a part of a surface of the permanent magnet facing the stator is covered with a ferromagnetic material. 永久磁石の固定子と抵抗する面に凹部を設け、その凹部に強磁性体を配設することで、永久磁石の固定子と対向する面の一部を強磁性体で覆ったことを特徴とする請求項１記載のアキシャルギャップ型回転電機。   It is characterized in that a part of the surface facing the stator of the permanent magnet is covered with a ferromagnetic material by providing a concave part on the surface that resists the stator of the permanent magnet and disposing a ferromagnetic material in the concave part. The axial gap type rotating electrical machine according to claim 1. 凹部を有する永久磁石が、複数個の磁石により構成されていることを特徴とする請求項２記載のアキシャルギャップ型回転電機。   The axial gap type rotating electrical machine according to claim 2, wherein the permanent magnet having the concave portion is composed of a plurality of magnets. 周方向で隣り合う永久磁石の間に強磁性体を配設し、永久磁石と配設した強磁性体との間に非磁性体層を設けたことを特徴とする請求項１〜３のいずれか１項に記載のアキシャルギャップ型回転電機。   The ferromagnetic material is provided between the permanent magnets adjacent in the circumferential direction, and a nonmagnetic material layer is provided between the permanent magnet and the provided ferromagnetic material. An axial gap type rotating electrical machine according to claim 1. 回転子を構成する回転子コアが、２種類以上の形状の電磁鋼板を組み合わせて構成されていることを特徴とする請求項１〜４のいずれか１項に記載のアキシャルギャップ型回転電機。   The axial gap type rotating electrical machine according to any one of claims 1 to 4, wherein the rotor core constituting the rotor is configured by combining two or more types of electromagnetic steel plates. 回転子を構成する回転子コアが、圧粉コアにより構成されていることを特徴とする請求項１〜４のいずれか１項に記載のアキシャルギャップ型回転電機。   The axial gap type rotating electrical machine according to any one of claims 1 to 4, wherein a rotor core constituting the rotor is constituted by a dust core. 回転子が固定子に挟み込まれた構成で、回転コアの両面に永久磁石を配置してなるアキシャルギャップ型回転電機であって、一方の固定子に対向する永久磁石を覆った強磁性体の位置と、他方の固定子に対向する永久磁石を覆った強磁性体の位置とが、回転方向にずれていることを特徴とする請求項１〜６のいずれか１項に記載のアキシャルギャップ型回転電機。   A configuration in which a rotor is sandwiched between stators and an axial gap type rotating electrical machine in which permanent magnets are arranged on both surfaces of a rotating core, and the position of a ferromagnetic material that covers a permanent magnet facing one stator The axial gap type rotation according to any one of claims 1 to 6, wherein a position of a ferromagnetic material covering a permanent magnet facing the other stator is shifted in a rotation direction. Electric.
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