JP7048359B2

JP7048359B2 - Axial gap motor

Info

Publication number: JP7048359B2
Application number: JP2018042500A
Authority: JP
Inventors: 圭一森永
Original assignee: Toyo Electric Manufacturing Ltd
Current assignee: Toyo Electric Manufacturing Ltd
Priority date: 2018-03-09
Filing date: 2018-03-09
Publication date: 2022-04-05
Anticipated expiration: 2038-03-09
Also published as: JP2019161760A

Description

本発明は、回転軸に固定のロータと、ロータに軸方向のギャップを持って対向配置されるステータとを備えたアキシャルギャップモータに関する。 The present invention relates to an axial gap motor including a rotor fixed to a rotating shaft and a stator arranged facing the rotor with an axial gap.

従来、この種のアキシャルギャップモータにおいては、ロータは、磁性体からなる円環状のロータコアを有し、ロータコアのステータとの対向面に周方向に沿って、軸方向に着磁された複数の円弧状の磁石片が間隔を有して設けられ、隣接する磁石片の着磁方向は互いに逆方向とされている（例えば、特許文献１参照）。 Conventionally, in this type of axial gap motor, the rotor has an annular rotor core made of a magnetic material, and a plurality of circles magnetized axially along the circumferential direction on the surface of the rotor core facing the stator. The arc-shaped magnet pieces are provided at intervals, and the magnetizing directions of the adjacent magnet pieces are opposite to each other (see, for example, Patent Document 1).

このようなアキシャルギャップモータには出力増大が求められている。その方策の一つとして、ロータとステータの対向面積を拡大させることが考えられるが、この場合、アキシャルギャップモータは扁平形状を有しているが故に外径が拡大し、これに伴いセンターハイトが長尺化する大型化という問題が生ずる。他の方策として、ロータ又はステータの体積を増加させ、磁気飽和を低減させることが考えられるが、この場合にも大型化の問題が生ずる。 Such an axial gap motor is required to have an increased output. As one of the measures, it is conceivable to increase the facing area between the rotor and the stator. In this case, since the axial gap motor has a flat shape, the outer diameter is expanded and the center height is increased accordingly. The problem of increasing the length and increasing the size arises. As another measure, it is conceivable to increase the volume of the rotor or the stator to reduce the magnetic saturation, but this also raises the problem of increasing the size.

特開２００６－５０７０６号公報Japanese Unexamined Patent Publication No. 2006-50706

本発明は、以上の点に鑑み、大型化することなく出力増大を実現することができるアキシャルギャップモータを提供することをその課題としている。 In view of the above points, it is an object of the present invention to provide an axial gap motor capable of realizing an increase in output without increasing the size.

上記課題を解決するために、本発明は、回転軸に固定のロータと、ロータに軸方向のギャップを持って対向配置されるステータとを備えたアキシャルギャップモータであって、ロータは、磁性体からなる円環状のロータコアを有し、ロータコアのステータとの対向面に周方向に沿って、軸方向に着磁された複数の円弧状の第１磁石片が間隔を有して設けられ、隣接する第１磁石片の着磁方向は互いに逆方向とされたものにおいて、ロータに、各第１磁石片の内周面に接する円弧状の第２磁石片が設けられると共に、各第１磁石片の外周面に接する円弧状の第３磁石片が設けられ、第２磁石片及び第３磁石片の着磁方向は径方向とされ、第１磁石片のステータとの対向面側がＮ極であるとき、第２磁石片の着磁方向は、第２磁石片の内周面側がＮ極となる方向であり、且つ第３磁石片の着磁方向は、第３磁石片の外周面側がＮ極となる方向であり、第１磁石片のステータとの対向面側がＳ極であるとき、第２磁石片の着磁方向は、第２磁石片の外周面側がＮ極となる方向であり、且つ第３磁石片の着磁方向は、第３磁石片の内周面側がＮ極となる方向であり、ロータコアのステータとの対向面の内周部と外周部とに、それぞれ、第２磁石片の内周面に接する磁性体からなる第１環状突起と、第３磁石片の外周面に接する磁性体からなる第２環状突起とが設けられていることを特徴とする。 In order to solve the above problems, the present invention is an axial gap motor including a rotor fixed to a rotating shaft and a stator arranged opposite to the rotor with an axial gap, and the rotor is a magnetic material. It has an annular rotor core made of, and a plurality of arcuate first magnet pieces magnetized in the axial direction are provided at intervals on the surface facing the stator of the rotor core along the circumferential direction and are adjacent to each other. In the case where the magnetizing directions of the first magnet pieces are opposite to each other, the rotor is provided with an arcuate second magnet piece in contact with the inner peripheral surface of each first magnet piece, and each first magnet piece is provided. A third magnet piece having an arc shape in contact with the outer peripheral surface of the magnet piece is provided, the magnetizing direction of the second magnet piece and the third magnet piece is the radial direction, and the side facing the stator of the first magnet piece is the N pole. At this time, the magnetizing direction of the second magnet piece is the direction in which the inner peripheral surface side of the second magnet piece is the N pole, and the magnetizing direction of the third magnet piece is the N pole on the outer peripheral surface side of the third magnet piece. When the side facing the stator of the first magnet piece is the S pole, the magnetizing direction of the second magnet piece is the direction in which the outer peripheral surface side of the second magnet piece is the N pole. The magnetizing direction of the third magnet piece is the direction in which the inner peripheral surface side of the third magnet piece becomes the N pole, and the second magnet piece is formed on the inner peripheral portion and the outer peripheral portion of the surface facing the stator of the rotor core, respectively. It is characterized in that a first annular projection made of a magnetic material in contact with the inner peripheral surface of the third magnet piece and a second annular projection made of a magnetic material in contact with the outer peripheral surface of the third magnet piece are provided.

これによれば、第１環状突起及び第２環状突起が、径方向に着磁された第２磁石片及び第３磁石片の磁路となり、この磁路はロータコアの周方向となるため、第２磁石片及び第３磁石片の磁束が上記磁路を、ステータとの対向面側がＳ極である第１磁石片側からステータとの対向面側がＮ極である第１磁石片側へと向かい、その結果、ロータコアの磁束密度が低減されると共に、ステータに設けられるコイルへの鎖交磁束量が増加する。従って、アキシャルギャップモータは、扁平形状という特長をそのままにして大型化することなく出力増大を実現することができる。 According to this, the first annular protrusion and the second annular protrusion become magnetic paths of the second magnet piece and the third magnet piece magnetized in the radial direction, and these magnetic paths are in the circumferential direction of the rotor core. The magnetic fluxes of the two magnet pieces and the third magnet piece head toward the magnetic path from the first magnet piece side where the facing surface side with the stator is the S pole to the first magnet piece side where the facing surface side with the stator is the N pole. As a result, the magnetic flux density of the rotor core is reduced, and the amount of interlinking magnetic flux to the coil provided in the stator is increased. Therefore, the axial gap motor can realize an increase in output without increasing the size while maintaining the feature of the flat shape.

本発明のアキシャルギャップモータの一実施形態を周方向に切断した要部斜視図。FIG. 3 is a perspective view of a main part obtained by cutting an embodiment of the axial gap motor of the present invention in the circumferential direction. 図１に示したアキシャルギャップモータのロータをステータの対向面側から示した要部斜視図。FIG. 3 is a perspective view of a main part showing the rotor of the axial gap motor shown in FIG. 1 from the facing surface side of the stator. 図１に示したアキシャルギャップモータのステータを示した要部斜視図。The main part perspective view which showed the stator of the axial gap motor shown in FIG. 実施例１及び比較例１～３のトルク特性を示したシミュレーション図。The simulation figure which showed the torque characteristic of Example 1 and Comparative Examples 1 to 3.

図１～３を参照して、アキシャルギャップモータ１は、図示していない回転軸に固定のロータ１１と、ロータ１１に軸方向Ａのギャップを持って対向配置されるステータ１２とを備えている。ロータ１１は、磁性体からなる円環状のロータコア１１ａを有し、ロータコア１１ａのステータ１２との対向面に周方向に沿って、軸方向Ａに着磁された複数の円弧状の第１磁石片１１ｂが間隔を有して設けられている。隣接する第１磁石片１１ｂの着磁方向は互いに逆方向とされている。ステータ１２は、円環状のステータコア１２ａを有し、ステータコア１２ａのロータ１１との対向面に周方向に沿って、軸方向Ａに突出する複数の円弧状のティース１２ｂが間隔を有して設けられている。ステータコア１２ａ及びティース１２ｂはいずれも磁性体からなっている。ティース１２ｂの周囲にはコイル１２ｃが巻回されている。このようなアキシャルギャップモータ１においては、磁束が軸方向Ａに鎖交する。 With reference to FIGS. 1 to 3, the axial gap motor 1 includes a rotor 11 fixed to a rotating shaft (not shown) and a stator 12 arranged to face the rotor 11 with a gap in the axial direction A. .. The rotor 11 has an annular rotor core 11a made of a magnetic material, and a plurality of arcuate first magnet pieces magnetized in the axial direction A along the circumferential direction on the surface of the rotor core 11a facing the stator 12. 11b are provided at intervals. The magnetizing directions of the adjacent first magnet pieces 11b are opposite to each other. The stator 12 has an annular stator core 12a, and a plurality of arcuate teeth 12b protruding in the axial direction A along the circumferential direction are provided on the facing surface of the stator core 12a with the rotor 11 at intervals. ing. Both the stator core 12a and the teeth 12b are made of a magnetic material. A coil 12c is wound around the teeth 12b. In such an axial gap motor 1, the magnetic flux interlinks in the axial direction A.

また、ロータ１１においては、各第１磁石片１１ｂの内周面に接する円弧状の第２磁石片１１ｃが設けられると共に、各第１磁石片１１ｂの外周面に接する円弧状の第３磁石片１１ｄが設けられている。第２磁石片１１ｃ及び第３磁石片１１ｄの着磁方向は径方向とされている。具体的には、図２中に矢印で示したように、第１磁石片１１ｂのステータ１２との対向面側がＮ極であるとき、第２磁石片１１ｃの着磁方向は、第２磁石片１１ｃの内周面側がＮ極となる方向であり、且つ第３磁石片１１ｄの着磁方向は、第３磁石片１１ｄの外周面側がＮ極となる方向である。また、第１磁石片１１ｂのステータ１２との対向面側がＳ極であるとき、第２磁石片１１ｃの着磁方向は、第２磁石片１１ｃの外周面側がＮ極となる方向であり、且つ第３磁石片１１ｄの着磁方向は、第３磁石片１１ｄの内周面側がＮ極となる方向である。 Further, in the rotor 11, an arc-shaped second magnet piece 11c in contact with the inner peripheral surface of each first magnet piece 11b is provided, and an arc-shaped third magnet piece in contact with the outer peripheral surface of each first magnet piece 11b is provided. 11d is provided. The magnetizing direction of the second magnet piece 11c and the third magnet piece 11d is the radial direction. Specifically, as shown by an arrow in FIG. 2, when the facing surface side of the first magnet piece 11b with the stator 12 is the N pole, the magnetizing direction of the second magnet piece 11c is the second magnet piece. The inner peripheral surface side of 11c is the north pole, and the magnetizing direction of the third magnet piece 11d is the direction in which the outer peripheral surface side of the third magnet piece 11d is the north pole. Further, when the facing surface side of the first magnet piece 11b with the stator 12 is the S pole, the magnetizing direction of the second magnet piece 11c is the direction in which the outer peripheral surface side of the second magnet piece 11c is the N pole. The magnetizing direction of the third magnet piece 11d is the direction in which the inner peripheral surface side of the third magnet piece 11d is the north pole.

さらに、ロータコア１１ａのステータ１２との対向面の内周部と外周部とには、それぞれ、第２磁石片１１ｃの内周面に接する磁性体からなる第１環状突起１１ｅと、第３磁石片１１ｄの外周面に接する磁性体からなる第２環状突起１１ｆとが設けられている。 Further, the inner peripheral portion and the outer peripheral portion of the rotor core 11a facing the stator 12 have a first annular projection 11e made of a magnetic material in contact with the inner peripheral surface of the second magnet piece 11c, and a third magnet piece, respectively. A second annular projection 11f made of a magnetic material in contact with the outer peripheral surface of 11d is provided.

上記の通りのアキシャルギャップモータ１においては、第１環状突起１１ｅ及び第２環状突起１１ｆが、径方向に着磁された第２磁石片１１ｃ及び第３磁石片１１ｄの磁路となり、この磁路はロータコア１１ａの周方向となるため、第２磁石片１１ｃ及び第３磁石片１１ｄの磁束が上記磁路を、ステータ１２との対向面側がＳ極である第１磁石片１１ｂ側からステータ１２との対向面側がＮ極である第１磁石片１１ｂ側へと向かう。その結果、ロータコア１１ａの磁束密度が低減されると共に、ステータ１２に設けられるコイル１２ｃへの鎖交磁束量が増加する。従って、アキシャルギャップモータ１は、扁平形状という特長をそのままにして大型化することなく出力増大を実現することができる。 In the axial gap motor 1 as described above, the first annular projection 11e and the second annular projection 11f become magnetic paths of the second magnet piece 11c and the third magnet piece 11d magnetized in the radial direction, and the magnetic paths are formed. Is in the circumferential direction of the rotor core 11a, so that the magnetic fluxes of the second magnet piece 11c and the third magnet piece 11d pass through the magnetic path, and the stator 12 and the stator 12 from the first magnet piece 11b side where the side facing the stator 12 is the S pole. The facing surface side of the magnet is N pole toward the first magnet piece 11b side. As a result, the magnetic flux density of the rotor core 11a is reduced, and the amount of interlinkage magnetic flux to the coil 12c provided on the stator 12 is increased. Therefore, the axial gap motor 1 can realize an increase in output without increasing the size while maintaining the feature of the flat shape.

なお、当然のことであるが、アキシャルギャップモータ１においては、大型化防止のために、各第１磁石片１１ｂとこれに設けられる第２磁石片１１ｃ及び第３磁石片１１ｄとの合計磁石量は、第２磁石片１１ｃ及び第３磁石片１１ｄが設けられない従来のアキシャルギャップモータのロータコアに設けられる各磁石片の磁石量と同じとする。また、第２磁石片１１ｃ及び第１環状突起１１ｅの径方向の合計幅はコイル１２ｃの径方向内側の部分の幅以内に収め、第３磁石片１１ｄ及び第２環状突起１１ｆの径方向の合計幅はコイル１２ｃの径方向外側の部分の幅以内に収める。 As a matter of course, in the axial gap motor 1, the total amount of magnets of each of the first magnet pieces 11b and the second magnet pieces 11c and the third magnet pieces 11d provided therein is to prevent the size from increasing. Is the same as the magnet amount of each magnet piece provided in the rotor core of the conventional axial gap motor in which the second magnet piece 11c and the third magnet piece 11d are not provided. Further, the total width in the radial direction of the second magnet piece 11c and the first annular protrusion 11e is kept within the width of the radial inner portion of the coil 12c, and the total width in the radial direction of the third magnet piece 11d and the second annular protrusion 11f. The width is within the width of the radial outer portion of the coil 12c.

図４を参照して、図１～図３に示したアキシャルギャップモータ１の出力の増大について詳述する。 With reference to FIG. 4, the increase in the output of the axial gap motor 1 shown in FIGS. 1 to 3 will be described in detail.

（実施例１）
実施例１は、アキシャルギャップモータ１であり、そのトルクは、後述する比較例１のアキシャルギャップモータのトルクよりも約６％大きい。
（比較例１）
比較例１は、第２磁石片１１ｃ及び第３磁石片１１ｄ並びに第１環状突起１１ｅ及び第２環状突起１１ｆがロータコアに設けられない従来のアキシャルギャップモータである。
（比較例２）
比較例２は、上記従来のアキシャルギャップモータに、実施例１のアキシャルギャップモータ１に採用した第１環状突起１１ｅ及び第２環状突起１１ｆのみをロータコアに設けたものである。そのトルクは、比較例１のアキシャルギャップモータよりわずかに大きくなるものの、実施例１のアキシャルギャップモータ１のトルクほど大きくはならない。
（比較例３）
比較例３は、上記従来のアキシャルギャップモータに、実施例１のアキシャルギャップモータ１に採用した第１磁石片１１ｃ及び第２磁石片１１ｄのみをロータコアに設けたものである。そのトルクは、比較例１の従来のアキシャルギャップモータのトルクとほぼ同等である。 (Example 1)
The first embodiment is an axial gap motor 1, and its torque is about 6% larger than the torque of the axial gap motor of Comparative Example 1 described later.
(Comparative Example 1)
Comparative Example 1 is a conventional axial gap motor in which the second magnet piece 11c and the third magnet piece 11d and the first annular protrusion 11e and the second annular protrusion 11f are not provided on the rotor core.
(Comparative Example 2)
In Comparative Example 2, the conventional axial gap motor is provided with only the first annular projection 11e and the second annular projection 11f adopted in the axial gap motor 1 of the first embodiment in the rotor core. Although the torque is slightly larger than that of the axial gap motor of Comparative Example 1, it is not as large as the torque of the axial gap motor 1 of Example 1.
(Comparative Example 3)
In Comparative Example 3, only the first magnet piece 11c and the second magnet piece 11d adopted in the axial gap motor 1 of the first embodiment are provided in the rotor core in the conventional axial gap motor. The torque is substantially the same as the torque of the conventional axial gap motor of Comparative Example 1.

実施例１と比較例１～３の対比から明らかなように、アキシャルギャップモータ１は、従来のアキシャルギャップモータと同径及び同体積であっても出力が増大する。 As is clear from the comparison between Example 1 and Comparative Examples 1 to 3, the output of the axial gap motor 1 is increased even if the diameter and volume of the axial gap motor 1 are the same as those of the conventional axial gap motor.

以上、本発明の実施形態を図面を参照して説明したが、本発明は以上の実施形態及び実施例に限定されない。第１環状突起１１ｅ及び第２環状突起１１ｆを除くロータコアの構造やステータの構造をはじめ、磁路形成に関与しない部分の構成及び構造には多種多様なものを採用することができる。 Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited to the above embodiments and examples. A wide variety of structures and structures of parts not involved in magnetic path formation can be adopted, including the structure of the rotor core and the structure of the stator excluding the first annular projection 11e and the second annular projection 11f.

１…アキシャルギャップモータ、１１…ロータ、１１ａ…ロータコア、１１ｂ…第１磁石片、１１ｃ…第２磁石片、１１ｄ…第３磁石片、１１ｅ…第１環状突起、１１ｆ…第２環状突起、１２…ステータ。
1 ... axial gap motor, 11 ... rotor, 11a ... rotor core, 11b ... first magnet piece, 11c ... second magnet piece, 11d ... third magnet piece, 11e ... first annular projection, 11f ... second annular projection, 12 … Stator.

Claims

An axial gap motor including a rotor fixed to a rotating shaft and a stator arranged facing the rotor with an axial gap.
The rotor has an annular rotor core made of a magnetic material, and a plurality of arcuate first magnet pieces magnetized in the axial direction are spaced from each other along the circumferential direction on the surface of the rotor core facing the stator. In the case where the magnetizing directions of the adjacent first magnet pieces are opposite to each other.
The rotor is provided with an arc-shaped second magnet piece in contact with the inner peripheral surface of each first magnet piece, and an arc-shaped third magnet piece in contact with the outer peripheral surface of each first magnet piece. The magnetizing direction of the piece and the third magnet piece is the radial direction, and when the facing surface side of the first magnet piece with the stator is N pole, the magnetizing direction of the second magnet piece is the inner circumference of the second magnet piece. The surface side is the north pole, and the magnetizing direction of the third magnet piece is the direction in which the outer peripheral surface side of the third magnet piece is the north pole, and the facing surface side of the first magnet piece with the stator is the S pole. When the magnetism direction of the second magnet piece is the direction in which the outer peripheral surface side of the second magnet piece becomes the N pole, and the magnetism direction of the third magnet piece is the inner peripheral surface side of the third magnet piece. It is the direction to become the north pole,
A first annular protrusion made of a magnetic material in contact with the inner peripheral surface of the second magnet piece and a magnetic material in contact with the outer peripheral surface of the third magnet piece are formed on the inner peripheral portion and the outer peripheral portion of the surface facing the stator of the rotor core, respectively. An axial gap motor characterized by being provided with a second annular protrusion made of.