JP3855284B2 - Rotating electric machine and manufacturing method thereof - Google Patents

Rotating electric machine and manufacturing method thereof Download PDF

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Publication number
JP3855284B2
JP3855284B2 JP25873495A JP25873495A JP3855284B2 JP 3855284 B2 JP3855284 B2 JP 3855284B2 JP 25873495 A JP25873495 A JP 25873495A JP 25873495 A JP25873495 A JP 25873495A JP 3855284 B2 JP3855284 B2 JP 3855284B2
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cylindrical body
magnet
manufacturing
rotating electrical
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JPH08163800A (en
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志賀　　孜
信行 林
正昇 大見
正巳 新美
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Denso Corp
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Denso Corp
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Description

【０００１】
【発明の属する技術分野】
本発明は、スタータモータに好適な回転電機およびその製造方法に関する。
【０００２】
【従来の技術】
従来のものでは、磁石のヨークへの固定方法として、筒状体を、弾性銅帯を丸めて周方向端を突き合わせて挿入することで、磁石をヨークの内周に固定する方法が、特開昭６１−１０９５０号公報に示されている。
【０００３】
【発明が解決しようとする課題】
従来のものでは、筒状体の周方向端部の突き合わせと磁石間の空間への張り出しを共に実施しているため、磁石厚さ，ヨーク内径の寸法公差により磁極内径が変動するため、突き合わせ部の緊迫力が不足して、筒状体による磁石のヨークへの押圧力が弱くなったり、磁石間への張り出し部の応力が過大となる等の欠点を有している。
【０００４】
そこで、本発明は上記課題に鑑み、筒状体により、磁石をヨーク内周面に確実に押圧することができる回転電機およびその製造方法を提供するものである。
【０００５】
【課題を解決するための手段】
本発明の回転電機およびその製造方法は、次の技術的手段を採用した。
〔請求項１の手段〕
円筒状のヨークの内周に配置された永久磁石と、
軸線に対し傾斜して略軸方向にのびる第１及び第２の端部を当接させ、円筒状に形成すると共に、前記永久磁石の内周に当接させた筒状体とを備える。
【０００６】
〔請求項２の手段〕
請求項１の回転機において、
前記筒状体の軸方向端面には、前記磁石側に折り曲げて前記磁石の軸方向端面に当接し、前記磁石の軸方向の位置決めを行う軸方向端部を有している。
〔請求項３の手段〕
請求項１もしくは２に記載の回転電機において、
前記第１の端部もしくは第２の端部の少なくとも一方は、円弧状に形成されている。
【０００７】
〔請求項４の手段〕
請求項３に記載の回転電機において、
前記第１の端部は直線状に形成され、第２の端部は円弧状に形成され、前記第２の端部が、前記第１の端部の中心付近で当接する。
〔請求項５の手段〕
請求項１もしくは２に記載の回転電機において、
前記第１の端部は、前記第２の端部をガイドするガイド部を有している
ことを特徴とする回転電機。
【０００８】
〔請求項６の手段〕
請求項５に記載の回転電機において、
前記ガイド部は、前記第１の端部を折り曲げて形成すると共に、前記磁石間に配置する
ことを特徴とする回転電機。
【０００９】
〔請求項７の手段〕
回転電機の円筒状のヨークの内周に、永久磁石からなる磁極を固定してなる回転電機の製造方法において、
前記ヨークの内周に永久磁石を配置し、
軸線に傾斜し、略軸方向にのびる第１及び第２の端部を有し、該第１及び第２の端部を当接させて、円筒状に形成した筒状体を、前記磁石の内周に配置し、
前記筒状体の第１及び第２の端部を相対的に移動させて、前記磁石を前記ヨークの内周に押圧している。
【００１０】
〔請求項８の手段〕
請求項７の回転電機の製造方法において、
前記筒状体の第１及び第２の端部を相対的に移動させて、前記磁石を前記ヨークの内周に押圧した後に、
前記筒状体の軸方向端面を前記磁石側に折り曲げて、前記磁石の軸方向の位置決めを行う。
【００１１】
〔請求項９の手段〕
請求項７もしくは８に記載の回転電機の製造方法において、
前記第１の端部もしくは第２の端部は、円弧状に形成されている。
〔請求項１０の手段〕
請求項９に記載の回転電機の製造方法において、
前記第１の端部は、直線状に形成され、第２の端部の軸方向の両端が円弧状とし、第２の端部が、段１の端部の軸方向の中心付近で当接する。
【００１２】
〔請求項１１の手段〕
請求項７もしくは８に記載の回転電機の製造方法において、
前記第１の端部は、前記第２の端部をガイドするガイド部を有している。
〔請求項１２の手段〕
請求項１１に記載の回転電機の製造方法において、
前記ガイド部は、前記第１の端部を折り曲げて形成されている。
【００１３】
【作用及び発明の効果】
〔請求項１および７の作用及び発明の効果〕
軸線に対し傾斜して略軸方向に延びる筒状体の第１及び第２の端部を当接させて相対的に移動させることにより、筒状体の直径を外径方向に拡げ磁石を押圧することができ、磁石の厚さ及びヨーク内径の寸法公差によって生じる磁極内径の個体差を吸収できる。よって、磁石の固定力が安定し、筒状体の応力が過大となることもなく、確実に磁石を固定できる効果がある。
【００１４】
〔請求項２および８の作用及び発明の効果〕
筒状体の軸方向端部を磁石側に折り曲げて磁石の軸方向端面に当接させることで、磁石相互の軸方向位置決めが確実に行われる。さらに、回転体である電機子がヨーク内に配設される場合、このヨーク内に電機子を挿入する時に、電機子を磁石に当てて破損させる危惧もなくなり、仮に破損が生じても、磁石の破片が軸方向端部に留まり、電機子と筒状体との間に侵入することがなく、電機子の回転を拘束するようなことがない。
【００１５】
〔請求項３および９の作用及び発明の効果〕
第１もしくは第２の端部を円弧状とすることで、第１と第２の端部の当接箇所が略点接触となり、筒状体の外径寸法はその接触点を含む断面部分の素材寸法で決定されるため、その接触点から軸方向前後に変位した部分は、若干外径寸法を変化させることができる。つまり、筒状体を真円柱外形を有する円筒ではなく、軸方向に若干寸法変化のある円柱にすることができるので、磁石内径がばらついても、そのばらつきを吸収するように筒状体が径方向に拡がり、確実に磁石を内径側から押圧固定できる。
【００１６】
〔請求項４および１０の作用及び発明の効果〕
第２の端部を円弧状とし、第２の端部が、第１の端部の軸線方向中央付近で行えるため、磁石の軸方向で若干ばらつく内径寸法に対し、軸方向前後で均等な緊迫力を発生でき、磁石が筒状体の円周面全体で一様に固定できる。
〔請求項５および１１の作用及び発明の効果〕
第１の端部にガイド部を有することで、第２の端部が径方向にずれて内周方向に突出することがなく、確実に磁石固定の緊迫力が得られ、さらに、ヨーク内の電機子の回転を阻害することがない。
【００１７】
〔請求項６および１２の作用及び発明の効果〕
ガイド部は、第１の端部を折り曲げるだけで形成できるので、特に他のガイド用部品を必要としない。また、折り曲げ部によって生じる径方向の張り出しは磁石間の空間に納めることができるので、余分な収納スペースを特に設ける必要もなく、部品点数を増すことなく、安価に製造することができる。
【００１８】
【発明の実施の形態】
（実施例１）
本発明の実施例１を図１および図２に基づいて説明する。１は固定子で筒状のヨーク２の内周に複数個の永久磁石よりなる磁極３が配設されている。４は磁極３の内周に配設されて磁極３をヨーク２の内周に押圧、固定する筒状体であり、帯状の薄板（例えば、アルミニウム板やステンレス板）を丸めて形成している。この筒状体４の周方向の第１，第２の端部４ａ，４ｂは、図２に示す如く、ヨーク軸線に対し互いに同一方向に傾斜して略軸方向に延び、各々突き合わせた状態で当接されている。第１，第２の端部４ａ，４ｂの突き合わせ部５は突き合わせ時、磁極３の内周面に当接し、突き合わせ時に外周方向へずれて外れることを防止している。
【００１９】
次に、本発明の固定子の組付方法を説明する。先ずヨーク２の内周に複数個の磁極３を所定のピッチで配設した後、磁極の内径よりやや小さめに丸めた筒状体４を各々第１，第２の端部４ａ，４ｂが当接する様に軸方向より挿入し、第１，第２の端部４ａ，４ｂを当接させながら、軸方向（図２に示す矢印方向）にずらすことにより、筒状体４の直径が広がり、磁極３をヨーク２の内周に確実に押圧する。それによって、筒状体４に適度な緊迫力が生じる様にした後で軸方向端部４ｃを磁極３側へ折り曲げる。これによって、磁極３相互の軸方向位置決めが確実に行われ、かつヨーク２に固定されるとともに、例えば、回転体である図示しない電機子をヨーク２内へ挿入する時に、電機子を磁極３に当てて破損させる危惧もなくなり、仮に破損が生じても、磁極３の破片が軸方向端部４ｃに留まり、電機子と筒状体４との間に侵入することがなく、電機子の回転を拘束するようなことがない。また、筒状体４を磁極３の内径より小径にして、ヨーク２内に挿入した後、筒状体４を拡げて組み付けるので、組み付けが非常に簡単にできる。
【００２０】
そして、筒状体４は帯状の薄板を丸めて形成し、組付時、第１，第２の端部４ａ，４ｂを当接させ、軸方向にずらしながら直径を拡げることにより、磁極３をヨーク２の内周に押圧固定する様に構成したため、磁極厚さ及びヨーク内径の寸法公差によって生じる磁極内径の個体差を第１，第２の端部４ａ，４ｂのずれで吸収できる。従って、筒状体４の応力が過大となることもなく、確実に磁極３をヨーク２に固定できる効果がある。また、筒状体４に帯状の薄板を用いるため、コスト的に有利なことはいうまでもない。さらに、本発明の効果として、磁極３間において筒状体４を従来の様に張り出す塑性加工を要しないため、伸びの少ない強度大の材料を用いることができ、磁極３の固定強度を増すことができる。このことは高い耐振性を必要とされる自動車用スタータ等の回転電機に適している。
【００２１】
更に磁極の厚さ、ヨーク内径等の公差による磁極内径寸法公差の吸収効果が大のため、それらの公差規格をゆるめることも可能であり、部品コストの低減効果が大である。尚、本発明の構成においては磁極とヨーク間の固定に際し接着剤を併用しても良い。
（実施例２）
図３および図４は、本発明の第２の実施例を示したものであり、筒状体４の第１，第２の端部４ａ，４ｂのうち第１の端部４ａを直線状に形成し、第２の端部４ｂを円弧状としたものである。このようにすれば、第１の端部４ａと第２の端部４ｂの当接箇所が略点接触となり、筒状体４の外径寸法はその接触点を含む断面部分の素材寸法で決定されるため、その接触点から軸方向前後に変位した部分は、若干外径寸法を変化させることができる。つまり、筒状体４を真円柱外形を有する円筒ではなく、軸方向に若干寸法変化のある円柱にすることができるので、磁極３内径がばらついても、そのばらつきを吸収するように筒状体４が径方向に拡がり、確実に磁極３を内径側から押圧固定できる。また、第２の端部４ｂを円弧状とすることで、第２の端部４ｂの当接位置が、第１の端部４ａの軸方向の中央付近で行なえるため、磁極３の軸方向で若干ばらつく内径寸法に対し、軸方向前後で均等な緊迫力を発生でき、磁極３が筒状体４の円周面全体で一様に固定できる。
【００２２】
なお、この実施例においては、第１の端部４ａを直線状に形成したが、第２の端部４ｂと同様に円弧状に形成して、第２の端部４ｂの当接位置を、第１の端部４ａの軸方向の中央付近で行ってもよい。
また、上記実施例においては、第１もしくは第２の端部４ａ、４ｂが、軸方向の中央付近において、突出するような円弧状としているが、図５に示すように、第１もしくは第２の端部４ａ、４ｂに２つの円弧部を形成して、軸方向の中央付近ではなく、２つの当接位置において、第１と第２の端部４ａ、４ｂを当接するようにしてもよい。なお、この当接位置は、２つ以上任意に形成することができる。
【００２３】
（実施例３）
図６、図７および図１０は本発明の第３の実施例であり、筒状４の第１の端部４ａを折り曲げ、Ｕ字状に形成されたガイド部をなす折り返し部６を設けて、第２の端部４ｂをこの折り返し部６にはさみ込んでいる。これによって、突き合わせ部５の内外周への外れを防止できるため、更に強固に磁極３を固定できる。
【００２４】
さらに言えば、第１の端部４ａに折り返し部６を有することで、第２の端部４ｂが径方向にずれて内周方向に突出し、十分な緊迫力が得られなくなることを防止することができるとともに、例えば、内周に突出した端部が図示されない電機子の回転に支障を与えることもない。
また、折り返し部６は、第１の端部４ａを折り曲げるだけで形成できるので、特に他のガイド用部材を必要しない。
【００２５】
なお、この場合には、折り返し部６が磁極３の内面より突出するのを防止するため、磁極３間に配置している。これによって、折り返し部６によって生じる径方向の張り出しは、磁極３間の空間に納めることができるので、余分な収納スペースを特に設ける必要がなく、部品点数を増やすことなく、安価に製造することができる。
【００２６】
（実施例４）
図８、図９および図１１は突き合わせ部の他の実施例を示したもので、第１の端部４ａの端面に複数の切り溝７を形成し、これら溝７間に設けた複数の折り曲げ部８でＵ字状のガイド部を構成したもので、実施例３に対し折り返し部６の径方向厚さを薄くすることができ、突き合わせ部５の内外周への外れを、さらに短い材料寸法で構成できる。
【００２７】
なお、上述した第１、第２の端部４ａ，４ｂが、軸線に対して傾斜して略軸方向に傾斜しているという意味は、単に第１、第２の端部４ａ，４ｂが直線的に直線的に形成されているだけを意味するのではなく、互いの第１、第２の端部４ａ，４ｂの接線が軸線に対して傾斜しているものを含むものである。
【図面の簡単な説明】
【図１】実施例１の固定子を示す断面図である。
【図２】固定子の側面断面図である。
【図３】実施例２の固定子を示す断面図である。
【図４】固定子の側面断面図である。
【図５】実施例２の突き合わせ部の他の実施例を示す断面図である。
【図６】実施例３の固定子を示す断面図である。
【図７】固定子の側面断面図である。
【図８】実施例４の固定子を示す断面図である。
【図９】固定子の側面断面図である。
【図１０】実施例３の突き合わせ部の斜視図である。
【図１１】実施例４の突き合わせ部の斜視図である。
【符号の説明】
１ 固定子
２ ヨーク
３ 磁極
４ 筒状体
４ａ 第１の端部
４ｂ 第２の端部
４ｃ 軸方向端部
５ 突き合わせ部
６ ガイド部をなす折り返し部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotating electrical machine suitable for a starter motor and a manufacturing method thereof.
[0002]
[Prior art]
Conventionally, as a method of fixing the magnet to the yoke, a method of fixing the magnet to the inner periphery of the yoke by rolling a cylindrical body with the elastic copper band rounded and butting the circumferential end abutting is disclosed. This is shown in Japanese Patent Publication No. 61-10950.
[0003]
[Problems to be solved by the invention]
In the conventional type, both the end of the cylindrical body in the circumferential direction is butted and the space between the magnets is projected, so the magnetic pole inner diameter varies depending on the dimensional tolerance of the magnet thickness and the yoke inner diameter. However, there is a drawback that the pressing force of the cylindrical body against the yoke of the magnet becomes weak and the stress of the protruding portion between the magnets becomes excessive.
[0004]
Therefore, in view of the above problems, the present invention provides a rotating electrical machine that can reliably press a magnet against the inner circumferential surface of a yoke with a cylindrical body, and a method for manufacturing the same.
[0005]
[Means for Solving the Problems]
The rotating electrical machine and the manufacturing method thereof according to the present invention employ the following technical means.
[Means of Claim 1]
A permanent magnet disposed on the inner periphery of a cylindrical yoke;
The first and second end portions that are inclined with respect to the axis and extend substantially in the axial direction are brought into contact with each other to form a cylindrical shape, and a cylindrical body that is brought into contact with the inner periphery of the permanent magnet.
[0006]
[Means of claim 2]
The rotating machine according to claim 1, wherein
The cylindrical body has an axial end that is bent toward the magnet and abuts against the axial end of the magnet to position the magnet in the axial direction.
[Means of claim 3]
In the rotating electrical machine according to claim 1 or 2,
At least one of the first end or the second end is formed in an arc shape.
[0007]
[Means of claim 4]
In the rotating electrical machine according to claim 3,
The first end portion is formed in a straight line shape, the second end portion is formed in an arc shape, and the second end portion abuts near the center of the first end portion.
[Means of claim 5]
In the rotating electrical machine according to claim 1 or 2,
The rotary electric machine characterized in that the first end portion has a guide portion that guides the second end portion.
[0008]
[Means of claim 6]
In the rotating electrical machine according to claim 5,
The rotating electrical machine according to claim 1, wherein the guide portion is formed by bending the first end portion and disposed between the magnets.
[0009]
[Means of Claim 7]
In the manufacturing method of a rotating electrical machine in which a magnetic pole made of a permanent magnet is fixed to the inner periphery of a cylindrical yoke of the rotating electrical machine,
A permanent magnet is disposed on the inner periphery of the yoke,
A cylindrical body having first and second end portions inclined to the axis and extending substantially in the axial direction, the first and second end portions being brought into contact with each other, is formed on the magnet. Placed on the inner circumference,
The first and second ends of the cylindrical body are relatively moved to press the magnet against the inner periphery of the yoke.
[0010]
[Means of Claim 8]
In the manufacturing method of the rotary electric machine of Claim 7,
After relatively moving the first and second ends of the cylindrical body and pressing the magnet against the inner periphery of the yoke,
The axial end face of the cylindrical body is bent toward the magnet, and the magnet is positioned in the axial direction.
[0011]
[Means of Claim 9]
In the manufacturing method of the rotary electric machine according to claim 7 or 8,
The first end or the second end is formed in an arc shape.
[Means of Claim 10]
In the manufacturing method of the rotary electric machine according to claim 9,
The first end is formed in a straight line, both ends in the axial direction of the second end are arc-shaped, and the second end is in contact with the vicinity of the axial center of the end of the stage 1 .
[0012]
[Means of Claim 11]
In the manufacturing method of the rotary electric machine according to claim 7 or 8,
The first end portion has a guide portion that guides the second end portion.
[Means of Claim 12]
In the manufacturing method of the rotary electric machine according to claim 11,
The guide portion is formed by bending the first end portion.
[0013]
[Operation and effect of the invention]
[Operation of claims 1 and 7 and effect of invention]
The first and second end portions of the cylindrical body that are inclined with respect to the axis and extend substantially in the axial direction are brought into contact with each other and moved relatively, thereby expanding the diameter of the cylindrical body in the outer diameter direction and pressing the magnet. Therefore, individual differences in the magnetic pole inner diameter caused by the dimensional tolerance of the magnet thickness and the yoke inner diameter can be absorbed. Therefore, the fixing force of the magnet is stabilized, and there is an effect that the magnet can be securely fixed without excessive stress of the cylindrical body.
[0014]
[Operations of Claims 2 and 8 and Effects of Invention]
By bending the axial end of the cylindrical body to the magnet side and bringing it into contact with the axial end surface of the magnet, the axial positioning of the magnets is reliably performed. Furthermore, when the armature that is a rotating body is disposed in the yoke, there is no risk of damaging the armature against the magnet when the armature is inserted into the yoke. The debris stays at the end in the axial direction, does not enter between the armature and the cylindrical body, and does not restrain the rotation of the armature.
[0015]
[Operations of Claims 3 and 9 and Effects of Invention]
By making the first or second end arc-shaped, the contact portion between the first and second ends becomes substantially point contact, and the outer diameter of the cylindrical body is that of the cross-sectional portion including the contact point. Since it is determined by the material dimensions, the outer diameter dimension can be slightly changed in the portion displaced in the axial direction from the contact point. In other words, the cylindrical body can be a cylinder with a slight dimensional change in the axial direction, rather than a cylinder having a true cylindrical outer shape, so that even if the magnet inner diameter varies, the cylindrical body has a diameter so as to absorb the variation. The magnet expands in the direction, and the magnet can be securely pressed from the inner diameter side.
[0016]
[Operations of Claims 4 and 10 and Effects of Invention]
The second end has an arc shape, and the second end can be performed near the center in the axial direction of the first end, so that the inner diameter dimension that slightly varies in the axial direction of the magnet is evenly tightened before and after the axial direction. Force can be generated, and the magnet can be fixed uniformly over the entire circumferential surface of the cylindrical body.
[Operations of Claims 5 and 11 and Effects of Invention]
By having the guide portion at the first end portion, the second end portion is not displaced in the radial direction and does not protrude in the inner circumferential direction, and a magnet fixing tightening force can be reliably obtained. Does not hinder the rotation of the armature.
[0017]
[Operations of Claims 6 and 12 and Effects of Invention]
Since the guide portion can be formed simply by bending the first end portion, no other guide parts are required. Further, since the radial overhang generated by the bent portion can be stored in the space between the magnets, it is not necessary to provide an extra storage space, and it can be manufactured at a low cost without increasing the number of parts.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Example 1
A first embodiment of the present invention will be described with reference to FIGS. A stator 1 is provided with a magnetic pole 3 made of a plurality of permanent magnets on the inner periphery of a cylindrical yoke 2. Reference numeral 4 denotes a cylindrical body which is disposed on the inner periphery of the magnetic pole 3 and presses and fixes the magnetic pole 3 to the inner periphery of the yoke 2 and is formed by rolling a strip-shaped thin plate (for example, an aluminum plate or a stainless steel plate). . As shown in FIG. 2, the first and second end portions 4 a and 4 b in the circumferential direction of the cylindrical body 4 are inclined in the same direction with respect to the yoke axis and extend substantially in the axial direction. It is in contact. The abutting portions 5 of the first and second end portions 4a and 4b abut against the inner peripheral surface of the magnetic pole 3 at the time of abutting, and prevent them from being displaced in the outer circumferential direction at the time of abutting.
[0019]
Next, a method for assembling the stator of the present invention will be described. First, a plurality of magnetic poles 3 are arranged on the inner periphery of the yoke 2 at a predetermined pitch, and then a cylindrical body 4 that is rounded slightly smaller than the inner diameter of the magnetic poles is applied to the first and second ends 4a and 4b, respectively. Inserting from the axial direction so as to come into contact with the first and second end portions 4a, 4b, while moving in the axial direction (arrow direction shown in FIG. 2), the diameter of the cylindrical body 4 increases, The magnetic pole 3 is reliably pressed against the inner periphery of the yoke 2. As a result, an appropriate tightening force is generated in the cylindrical body 4, and then the axial end 4c is bent toward the magnetic pole 3. This ensures that the magnetic poles 3 are axially positioned relative to each other and fixed to the yoke 2. For example, when an armature (not shown) that is a rotating body is inserted into the yoke 2, the armature is attached to the magnetic pole 3. There is no risk of damage due to contact, and even if damage occurs, the fragments of the magnetic pole 3 remain at the axial end 4c and do not enter between the armature and the cylindrical body 4 and rotate the armature. There is no such thing as restraint. Moreover, since the cylindrical body 4 is made smaller than the inner diameter of the magnetic pole 3 and inserted into the yoke 2, the cylindrical body 4 is expanded and assembled, so that the assembly can be made very easy.
[0020]
The cylindrical body 4 is formed by rolling a strip-shaped thin plate, and when assembled, the first and second end portions 4a and 4b are brought into contact with each other, and the diameter is increased while shifting in the axial direction. Since it is configured to be pressed and fixed to the inner periphery of the yoke 2, individual differences in the magnetic pole inner diameter caused by the dimensional tolerances of the magnetic pole thickness and the yoke inner diameter can be absorbed by the deviation of the first and second ends 4a and 4b. Therefore, there is an effect that the magnetic pole 3 can be reliably fixed to the yoke 2 without the stress of the cylindrical body 4 becoming excessive. Moreover, since a strip-shaped thin plate is used for the cylindrical body 4, it cannot be overemphasized that it is advantageous in terms of cost. Further, as an effect of the present invention, since the plastic working for projecting the cylindrical body 4 between the magnetic poles 3 is not required, a material having a low strength and a high strength can be used, and the fixing strength of the magnetic pole 3 is increased. be able to. This is suitable for a rotating electrical machine such as an automobile starter that requires high vibration resistance.
[0021]
Furthermore, since the effect of absorbing the magnetic pole inner diameter dimensional tolerance due to tolerances such as the thickness of the magnetic pole and the inner diameter of the yoke is large, it is possible to loosen these tolerance standards, and the effect of reducing component costs is great. In the configuration of the present invention, an adhesive may be used together for fixing between the magnetic pole and the yoke.
(Example 2)
3 and 4 show a second embodiment of the present invention, and the first end 4a of the first and second ends 4a and 4b of the cylindrical body 4 is linear. The second end 4b is formed in an arc shape. If it does in this way, the contact location of the 1st edge part 4a and the 2nd edge part 4b will become a substantially point contact, and the outer-diameter dimension of the cylindrical body 4 is determined by the raw material dimension of the cross-sectional part containing the contact point. Therefore, the outer diameter dimension of the portion displaced in the axial direction from the contact point can be slightly changed. That is, the cylindrical body 4 is not a cylinder having a true cylindrical outer shape, but can be a column having a slight dimensional change in the axial direction. Therefore, even if the inner diameter of the magnetic pole 3 varies, the cylindrical body can absorb the variation. 4 expands in the radial direction, and the magnetic pole 3 can be reliably pressed and fixed from the inner diameter side. In addition, since the second end 4b is formed in an arc shape, the contact position of the second end 4b can be performed near the center of the first end 4a in the axial direction. With respect to the inner diameter dimension that varies slightly, a uniform pressing force can be generated before and after the axial direction, and the magnetic pole 3 can be fixed uniformly over the entire circumferential surface of the cylindrical body 4.
[0022]
In this embodiment, the first end portion 4a is formed in a straight line shape, but it is formed in an arc shape like the second end portion 4b, and the contact position of the second end portion 4b is You may carry out near the center of the axial direction of the 1st edge part 4a.
Moreover, in the said Example, although the 1st or 2nd edge part 4a, 4b is made into the circular arc shape which protrudes in the center vicinity of an axial direction, as shown in FIG. Two arc portions may be formed at the end portions 4a and 4b of the first and second end portions 4a and 4b at two contact positions instead of near the center in the axial direction. . Two or more contact positions can be arbitrarily formed.
[0023]
Example 3
FIG. 6, FIG. 7 and FIG. 10 show a third embodiment of the present invention, in which a first end portion 4a of a tubular shape 4 is bent and a folded portion 6 forming a U-shaped guide portion is provided. The second end 4b is sandwiched between the folded portions 6. As a result, the butt portion 5 can be prevented from coming off to the inner and outer circumferences, and the magnetic pole 3 can be fixed more firmly.
[0024]
Furthermore, by having the folded portion 6 at the first end portion 4a, the second end portion 4b is displaced in the radial direction and protrudes in the inner circumferential direction, thereby preventing a sufficient tightening force from being obtained. In addition, for example, the end protruding to the inner periphery does not hinder the rotation of the armature (not shown).
Moreover, since the folding | returning part 6 can be formed only by bend | folding the 1st edge part 4a, another member for guides is not especially required.
[0025]
In this case, the folded portion 6 is disposed between the magnetic poles 3 in order to prevent the folded portion 6 from protruding from the inner surface of the magnetic pole 3. As a result, the radial overhang produced by the turned-up portion 6 can be stored in the space between the magnetic poles 3, so that it is not necessary to provide an extra storage space and can be manufactured at low cost without increasing the number of components. it can.
[0026]
Example 4
8, FIG. 9 and FIG. 11 show another embodiment of the abutting portion. A plurality of cut grooves 7 are formed on the end face of the first end portion 4a, and a plurality of bent portions provided between the grooves 7 are formed. The portion 8 constitutes a U-shaped guide portion, and the radial thickness of the folded portion 6 can be reduced compared to the third embodiment, and the detachment of the butted portion 5 to the inner and outer circumferences can be further shortened. Can be configured.
[0027]
The first and second end portions 4a and 4b described above are inclined with respect to the axis and inclined substantially in the axial direction. The first and second end portions 4a and 4b are simply straight lines. It does not mean that the first and second end portions 4a and 4b are inclined with respect to the axis.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a stator of Example 1. FIG.
FIG. 2 is a side cross-sectional view of a stator.
3 is a cross-sectional view showing a stator of Example 2. FIG.
FIG. 4 is a side sectional view of the stator.
5 is a cross-sectional view showing another example of the butting portion of Example 2. FIG.
6 is a cross-sectional view showing a stator of Example 3. FIG.
FIG. 7 is a side sectional view of the stator.
8 is a cross-sectional view showing a stator of Example 4. FIG.
FIG. 9 is a side sectional view of the stator.
10 is a perspective view of a butting portion according to Embodiment 3. FIG.
11 is a perspective view of a butting portion according to Embodiment 4. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stator 2 Yoke 3 Magnetic pole 4 Cylindrical body 4a 1st edge part 4b 2nd edge part 4c Axial direction edge part 5 Abutting part 6 Folding part which makes a guide part

Claims (12)

円筒状のヨークの内周に配置された永久磁石と、
軸線に対し傾斜して略軸方向にのびる第１及び第２の端部を当接させ、円筒状に形成すると共に、前記永久磁石の内周に当接させた筒状体とを備え、
この筒状体の第１及び第２の端部を当接させて相対的に移動させることにより、筒状体の直径を外径方向に拡げ前記磁石を押圧するようにしたことを特徴とする回転電機。A permanent magnet disposed on the inner periphery of a cylindrical yoke;
A cylindrical body that is inclined with respect to the axis and is in contact with the first and second ends extending substantially in the axial direction, is formed in a cylindrical shape, and is in contact with the inner periphery of the permanent magnet ;
The first and second end portions of the cylindrical body are brought into contact with each other and moved relatively, thereby expanding the diameter of the cylindrical body in the outer diameter direction and pressing the magnet. Rotating electric machine. 請求項１の回転機において、
前記筒状体の軸方向端面には、前記磁石側に折り曲げて前記磁石の軸方向端面に当接し、前記磁石の軸方向の位置決めを行う軸方向端部を有していることを特徴とする回転電機。The rotating machine according to claim 1, wherein
The axial end surface of the cylindrical body has an axial end that is bent toward the magnet and abuts against the axial end surface of the magnet to position the magnet in the axial direction. Rotating electric machine. 請求項１もしくは２に記載の回転電機において、
前記第１の端部もしくは第２の端部の少なくとも一方は、円弧状に形成されていることを特徴とする回転電機。In the rotating electrical machine according to claim 1 or 2,
At least one of the first end or the second end is formed in an arc shape. 請求項３に記載の回転電機において、
前記第１の端部は直線状に形成され、第２の端部は円弧状に形成され、前記第２の端部が、前記第１の端部の中心付近で当接することを特徴とする回転電機。In the rotating electrical machine according to claim 3,
The first end portion is formed in a straight line shape, the second end portion is formed in an arc shape, and the second end portion abuts in the vicinity of the center of the first end portion. Rotating electric machine. 請求項１もしくは２に記載の回転電機において、
前記第１の端部は、前記第２の端部をガイドするガイド部を有していることを特徴とする回転電機。In the rotating electrical machine according to claim 1 or 2,
The rotary electric machine characterized in that the first end portion has a guide portion that guides the second end portion. 請求項５に記載の回転電機において、
前記ガイド部は、前記第１の端部を折り曲げて形成すると共に、前記磁石間に配置することを特徴とする回転電機。In the rotating electrical machine according to claim 5,
The rotating electrical machine according to claim 1, wherein the guide portion is formed by bending the first end portion and disposed between the magnets. 回転電機の円筒状のヨークの内周に、永久磁石からなる磁極を固定してなる回転電機の製造方法において、
前記ヨークの内周に永久磁石を配置し、
軸線に対して傾斜し、略軸方向にのびる第１及び第２の端部を有し、前記第１および第２の端部を当接させ、円筒状に形成した筒状体を、前記磁石の内周に配置し、
前記筒状体の第１及び第２の端部を相対的に移動させて、筒状体の直径を外径方向に拡げ前記磁石を前記ヨークの内周に押圧することを特徴とする回転電機の製造方法。In the manufacturing method of a rotating electrical machine in which a magnetic pole made of a permanent magnet is fixed to the inner periphery of a cylindrical yoke of the rotating electrical machine,
A permanent magnet is disposed on the inner periphery of the yoke,
A cylindrical body having first and second end portions that are inclined with respect to the axis and extends substantially in the axial direction, the first and second end portions being brought into contact with each other, is formed into the cylindrical shape. Placed on the inner circumference of
A rotating electrical machine characterized by relatively moving the first and second ends of the cylindrical body to expand the diameter of the cylindrical body in the outer diameter direction and press the magnet against the inner periphery of the yoke. Manufacturing method. 請求項７の回転電機の製造方法において、
前記筒状体の第１及び第２の端部を相対的に移動させて、前記磁石を前記ヨークの内周に押圧した後に、
前記筒状体の軸方向端面を前記磁石側に折り曲げて、前記磁石の軸方向の位置決めを行うことを特徴とする回転電機の製造方法。In the manufacturing method of the rotary electric machine of Claim 7,
After relatively moving the first and second ends of the cylindrical body and pressing the magnet against the inner periphery of the yoke,
A method of manufacturing a rotating electrical machine, wherein the axial end face of the cylindrical body is bent toward the magnet side to position the magnet in the axial direction. 請求項７もしくは８に記載の回転電機の製造方法において、
前記第１の端部もしくは第２の端部を円弧状とすることを特徴とする回転電機の製造方法。In the manufacturing method of the rotary electric machine according to claim 7 or 8,
A method of manufacturing a rotating electrical machine, wherein the first end or the second end is formed in an arc shape. 請求項９に記載の回転電機の製造方法において、
前記第１の端部は直線状に形成され、第２の端部は円弧状に形成され、前記第２の端部が、前記第１の端部の中心付近で当接することを特徴とする回転電機の製造方法。In the manufacturing method of the rotary electric machine according to claim 9,
The first end portion is formed in a straight line shape, the second end portion is formed in an arc shape, and the second end portion abuts in the vicinity of the center of the first end portion. A method of manufacturing a rotating electrical machine. 請求項７もしくは８に記載の回転電機の製造方法において、
前記第１の端部は、前記第２の端部をガイドするガイド部を有していることを特徴とする回転電機の製造方法。In the manufacturing method of the rotary electric machine according to claim 7 or 8,
The method of manufacturing a rotating electrical machine, wherein the first end portion has a guide portion that guides the second end portion. 請求項１１に記載の回転電機の製造方法において、
前記ガイド部は、前記第１の端部をＵ字状に折り曲げて形成すると共に、前記磁石間に配置することを特徴とする回転電機の製造方法。In the manufacturing method of the rotary electric machine according to claim 11,
The guide portion is formed by bending the first end portion into a U shape, and is disposed between the magnets.
JP25873495A 1994-10-05 1995-10-05 Rotating electric machine and manufacturing method thereof Expired - Lifetime JP3855284B2 (en)

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US6522041B1 (en) * 2000-03-08 2003-02-18 Black & Decker Inc. Permanent magnet motor flux rings
KR100446194B1 (en) * 2002-08-28 2004-08-30 주식회사 태평양금속 Device for arranging and fixing magnets in motor housing, method and apparatus for arranging and fixing magnets using the device
JP5813942B2 (en) * 2009-11-04 2015-11-17 ヴァレオ エキプマン エレクトリク モトゥール Rotating electrical equipment, mainly rotating electrical equipment for automobile starters
DE102010029251A1 (en) * 2010-05-25 2011-12-01 Robert Bosch Gmbh Component for an electrical machine and method and lamination for the construction of such a component
KR102494590B1 (en) * 2021-02-15 2023-02-06 김동규 Magnet fixture for DC motor

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