JP2005039992A - Brushless motor and motor for power steering - Google Patents

Brushless motor and motor for power steering Download PDF

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JP2005039992A
JP2005039992A JP2004177281A JP2004177281A JP2005039992A JP 2005039992 A JP2005039992 A JP 2005039992A JP 2004177281 A JP2004177281 A JP 2004177281A JP 2004177281 A JP2004177281 A JP 2004177281A JP 2005039992 A JP2005039992 A JP 2005039992A
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arc
divided
circumferential direction
portions
annular
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JP4444737B2 (en
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Masashi Yamamura
真史 山村
Masahiro Goto
昌宏 後藤
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Asmo Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a brushless motor, wherein wires can be easily wound, the wound wires can be easily made annular, and the relative movement of divided core portions can be easily inhibited. <P>SOLUTION: A stator core 6 comprises an annular portion 8 secured to the inner circumferential surface of a housing, and tooth portions 7 radially disposed. The stator core 6 consists of a plurality of the divided core portions 13. The divided core portions 13 are formed by alternately laminating first and second laminated members. An arc-shaped projection 11f is formed at one end of each first laminated member in the circumferential direction, and an arc-shaped recess 11g is formed at the other end in the circumferential direction. An arc-shaped recess is formed at one end of each second laminated member in the circumferential direction, and an arc-shaped projection is formed at the other end in the circumferential direction. The adjacent divided core portions 13 are so disposed that their arc-shaped projections overlap one another in the axial direction, and they are permitted to turn. Being arranged annularly, a plurality of the divided core portions 13 are shrink fit into the housing, so that their relative movement is inhibited. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、ブラシレスモータ及びパワーステアリング装置用モータに関するものである。   The present invention relates to a brushless motor and a motor for a power steering device.

従来、車両のステアリングホイールに連結される車両操舵軸の作動をアシストするためのパワーステアリング装置用モータとしては、ハウジング（ヨーク）にマグネットが固着された直流型のモータがある（特許文献１参照）。しかし、このようなパワーステアリング装置用モータは、路面近傍に配置され飛石の衝撃等が加わる虞があることと、マグネットが衝撃に弱い（破損しやすい）ことから、ハウジングの剛性を高くする必要がある。よって、ハウジングを剛性の強い鉄材などにて形成したり、板厚を厚くする必要がある。このことは、軽量化が求められる現在の車両に対し、パワーステアリング装置用モータが重くなってしまう原因となる。   Conventionally, as a motor for a power steering apparatus for assisting the operation of a vehicle steering shaft connected to a steering wheel of a vehicle, there is a direct current motor in which a magnet is fixed to a housing (yoke) (see Patent Document 1). . However, such a motor for a power steering device is disposed near the road surface, and there is a possibility that a stepping stone impact may be applied, and the magnet is vulnerable to impact (easy to break), so it is necessary to increase the rigidity of the housing. is there. Therefore, it is necessary to form the housing with a highly rigid iron material or to increase the plate thickness. This causes the power steering device motor to become heavier than the current vehicle that is required to be lighter.

そこで、パワーステアリング装置用モータとして、ハウジングの内周に固定されるステータと、ステータの内側に収容されるロータとを備えたブラシレスモータを採用することが考えられる。このようなブラシレスモータのステータは、ハウジングの内周に固定される環状部と該環状部に径方向外側端部が連結され放射状に配置されるティース部とを有するステータコア（コア）を備える。そして、このようなステータコアとしては、ティース部毎に分割された形状の分割コア部が環状に連結されてなるものがある。このようなステータ（ステータコア）では、分割コア部を環状に連結する前にティース部に巻線を巻装することで、隣り合うティース部が邪魔になることなく、巻線を容易に巻装することができる。   Therefore, it is conceivable to employ a brushless motor having a stator fixed to the inner periphery of the housing and a rotor housed inside the stator as the motor for the power steering device. The stator of such a brushless motor includes a stator core (core) having an annular portion that is fixed to the inner periphery of the housing and teeth portions that are radially arranged with the radially outer end connected to the annular portion. As such a stator core, there is one in which divided core portions having a shape divided for each tooth portion are connected in a ring shape. In such a stator (stator core), by winding the winding around the tooth portion before connecting the split core portions in an annular shape, the winding can be easily wound without the adjacent teeth portion interfering with each other. be able to.

そして、このようなステータコアとしては、環状部と対応した周方向端部の長さが異なる第１及び第２積層部材が交互に積層されて分割コア部の周方向端部が凹凸を繰り返す形状とされたものがある（例えば、特許文献２参照）。そして、隣り合う前記分割コア部は、周方向端部の凹凸が互いに嵌り合うように（即ち凸部同士が重なり合うように）配設され、重なり合った凸部に軸方向にピンが貫通されることで連結されて、ステータコアを構成することになる。このようなステータでは、複数の分割コア部が環状に配列された状態で隣り合う分割コア部の凸部同士が軸方向に重なり合うため（軸方向に直線的な隙間ができないため）、環状部の磁気抵抗が小さくなり磁気回路が良好となる。又、凸部同士が軸方向に重なり合うため、分割コア部同士が軸方向にズレることが防止される。
特許第３０５９０５９号公報 特開平７−２２２３８３号公報 And as such a stator core, the 1st and 2nd lamination | stacking member from which the length of the circumferential direction edge part corresponding to a cyclic | annular part differs is laminated | stacked alternately, and the circumferential direction edge part of a division | segmentation core part repeats an unevenness | corrugation. (For example, refer to Patent Document 2). The adjacent divided core portions are arranged so that the concave and convex portions of the circumferential end portions fit each other (that is, the convex portions overlap each other), and the pin is penetrated in the axial direction in the overlapping convex portions. To form a stator core. In such a stator, since the convex portions of the adjacent divided core portions overlap in the axial direction with a plurality of divided core portions arranged in an annular shape (since there is no linear gap in the axial direction), The magnetic resistance is reduced and the magnetic circuit is improved. Moreover, since the convex portions overlap in the axial direction, the divided core portions are prevented from being displaced in the axial direction.
Japanese Patent No. 3059059 JP-A-7-222383

しかしながら、上記のようなブラシレスモータ（ステータ）では、分離された（ピンにて連結されていない）分割コア部に巻線を巻装するため、巻装工程の後に分割コア部を環状に配置する（凹凸を互いに嵌め合う）工程を要し、ティース部の数（例えば１２個）に分離された分割コア部の取り扱いが煩雑となる。又、隣り合う分割コア部をそれぞれピンにて連結してそれらの相対移動を規制するため部品点数及び組み付け工数が増大してしまう。   However, in the brushless motor (stator) as described above, since the winding is wound around the separated divided core parts (not connected by pins), the divided core parts are arranged annularly after the winding process. A process of fitting the irregularities to each other is required, and handling of the divided core parts separated into the number of teeth parts (for example, 12) becomes complicated. In addition, since the adjacent divided core portions are connected by pins and their relative movement is restricted, the number of parts and assembly man-hours increase.

本発明の目的は、巻線を容易に巻装することができ、巻線後の環状化を容易とすることができ、容易に分割コア部の相対移動を規制することができるブラシレスモータ、及びパワーステアリング装置用モータを提供することにある。   An object of the present invention is to provide a brushless motor that can easily wind a winding, can be easily circularized after winding, and can easily regulate the relative movement of the split core portion, and The object is to provide a motor for a power steering apparatus.

請求項１に記載の発明は、略筒状のハウジング内周に固定されるステータと、前記ステータの内側に収容されるロータとを備えたブラシレスモータにおいて、前記ステータは、環状部と該環状部に径方向外側端部が連結され放射状に配置されるティース部とを有するコアを備え、前記コアは、前記環状部を周方向に分割した分割環状部と該分割環状部の略直交方向に延びる前記ティース部とを有する複数の分割コア部から構成され、前記分割コア部は、積層部材が積層されて形成されるものであって、該積層部材の前記分割環状部と対応した周方向一端には軸方向から見て周方向に円弧凸状の円弧凸部が形成され同周方向他端には周方向に円弧凹状の円弧凹部が形成され、前記円弧凹部及び前記円弧凸部は、複数の前記分割コア部が配列された状態で隣接する前記分割コア部の前記円弧凹部及び前記円弧凸部と互いに回動案内面を形成するよう設定され、複数の前記分割コア部が環状に配列され前記環状部の外周面が前記ハウジングに圧着するように内嵌された。   The invention according to claim 1 is a brushless motor comprising a stator fixed to the inner periphery of a substantially cylindrical housing, and a rotor accommodated inside the stator, wherein the stator includes an annular portion and the annular portion. A core having a radially outer end portion and a radially arranged tooth portion, the core extending in a direction substantially orthogonal to the divided annular portion obtained by dividing the annular portion in the circumferential direction. The divided core portion is formed by laminating laminated members, and is formed at one end in the circumferential direction corresponding to the divided annular portion of the laminated member. Is formed with an arc-shaped convex portion that is arc-shaped in the circumferential direction when viewed from the axial direction, and an arc-shaped concave portion that is arc-shaped in the circumferential direction at the other end in the circumferential direction. The divided core portions are arranged The arcuate recesses and the arcuate projections adjacent to each other in the state are set so as to form a rotation guide surface, and a plurality of the divided core portions are arranged in an annular shape, and an outer peripheral surface of the annular portion is the housing It was fitted so as to be crimped.

請求項２に記載の発明は、略筒状のハウジングの内周に固定されるステータと、前記ステータの内側に収容されるロータとを備えたブラシレスモータにおいて、前記ステータは、前記ハウジングの内周に固定される環状部と該環状部に径方向外側端部が連結され放射状に配置されるティース部とを有するコアを備え、前記コアは、前記環状部を周方向に分割した分割環状部と該分割環状部の略直交方向に延びる前記ティース部とを有する複数の分割コア部から構成され、前記分割コア部は、第１及び第２積層部材が交互に積層されて形成され、前記第１積層部材の前記分割環状部と対応した周方向一端には軸方向から見て周方向に円弧凸状の円弧凸部が形成され同周方向他端には周方向に円弧凹状の円弧凹部が形成され、前記第２積層部材の前記分割環状部と対応した周方向一端には軸方向から見て周方向に円弧凹状の円弧凹部が形成され同周方向他端には周方向に円弧凸状の円弧凸部が形成され、複数の前記分割コア部が配列された状態で前記円弧凸部同士が軸方向に重なり合うと共に隣り合う前記分割コア部の回動を許容するように設定され、複数の前記分割コア部が環状に配列され前記ハウジングに内嵌されることで、それらの相対移動が規制されるようにした。   According to a second aspect of the present invention, there is provided a brushless motor including a stator fixed to an inner periphery of a substantially cylindrical housing and a rotor accommodated inside the stator, wherein the stator is an inner periphery of the housing. And a core having a radially outer end connected to the annular portion and a radially disposed tooth portion, the core being divided annular portions obtained by dividing the annular portion in the circumferential direction; The divided annular portion includes a plurality of divided core portions extending in a substantially orthogonal direction, and the divided core portion is formed by alternately laminating first and second laminated members, An arc convex portion having an arc convex shape in the circumferential direction when viewed from the axial direction is formed at one circumferential end corresponding to the divided annular portion of the laminated member, and an arc concave portion having an arc concave shape in the circumferential direction is formed at the other circumferential end. Of the second laminated member A circular arc concave portion is formed in the circumferential direction when viewed from the axial direction at one end in the circumferential direction corresponding to the divided annular portion, and an arc convex portion is formed in the circumferential direction at the other end in the circumferential direction. In the state where the divided core portions are arranged, the arc-shaped convex portions overlap in the axial direction and are set so as to allow rotation of the adjacent divided core portions, and a plurality of the divided core portions are arranged in an annular shape. By being fitted in the housing, their relative movement is restricted.

請求項３に記載の発明は、請求項１又は２に記載のブラシレスモータにおいて、前記円弧凸部及び前記円弧凹状の円弧は、その円弧を含む円周上において前記環状部の径方向における最も内側の点を含む。   According to a third aspect of the present invention, in the brushless motor according to the first or second aspect, the arc convex portion and the arc concave arc are the innermost in the radial direction of the annular portion on a circumference including the arc. Including points.

請求項４に記載の発明は、請求項２に記載のブラシレスモータにおいて、前記円弧凸部の周方向に突出する円弧は、半円未満からなる。
請求項５に記載の発明は、環状部と該環状部に径方向外側端部が連結され放射状に配置されるティース部とを有するステータコアは、前記環状部を周方向に分割した分割環状部と該分割環状部の略直交方向に延びる前記ティース部とを有する複数の分割コア部から構成され、前記分割コア部は、積層部材が積層されて形成されるものであって、該積層部材の前記分割環状部と対応した周方向一端には軸方向から見て周方向に円弧凸状の円弧凸部が形成され同周方向他端には周方向に円弧凹状の円弧凹部が形成され、前記円弧凹部及び前記円弧凸部は、複数の前記分割コア部が配列された状態で隣接する前記分割コア部の前記円弧凹部及び前記円弧凸部と互いに回動案内面を形成するよう設定され、前記円弧凸部及び前記円弧凹状の円弧は、その円弧を含む円周上において前記環状部の径方向における最も内側の点を含む。 According to a fourth aspect of the present invention, in the brushless motor according to the second aspect of the present invention, the arc projecting in the circumferential direction of the arc convex portion is less than a semicircle.
According to a fifth aspect of the present invention, there is provided a stator core having an annular portion and a tooth portion that is radially arranged with the radially outer end connected to the annular portion, and a divided annular portion obtained by dividing the annular portion in the circumferential direction. The divided annular portion includes a plurality of divided core portions extending in a direction substantially orthogonal to the divided annular portion, and the divided core portion is formed by stacking laminated members, A circular arc-shaped convex portion is formed in the circumferential direction as viewed from the axial direction at one end in the circumferential direction corresponding to the divided annular portion, and an arc-shaped concave portion is formed in the circumferential direction at the other end in the circumferential direction. The concave portion and the circular arc convex portion are set so as to form a rotation guide surface with the circular arc concave portion and the circular arc convex portion of the adjacent divided core portion in a state where a plurality of the divided core portions are arranged. The convex part and the concave circular arc are In circumferentially containing an arc including a point on the most inward in the radial direction of the annular portion.

請求項６に記載の発明は、請求項１乃至３のいずれか１項に記載のブラシレスモータにおいて、前記積層部材又は前記第１及び第２積層部材の前記分割環状部と対応した周方向端部における前記円弧凸部及び前記円弧凹部より前記環状部の径方向内側には、隣り合う前記分割コア部の回動の終端位置で当接する終端当接面が形成される。   A sixth aspect of the present invention is the brushless motor according to any one of the first to third aspects, wherein the circumferential end corresponding to the divided annular portion of the laminated member or the first and second laminated members. An end abutting surface that abuts at an end position of rotation of the adjacent divided core portion is formed on the radially inner side of the annular portion from the arc convex portion and the arc concave portion.

請求項７に記載の発明は、略筒状のハウジングの内周に固定されるステータと、前記ステータの内側に収容されるロータとを備えたブラシレスモータにおいて、前記ステータは、前記ハウジングの内周に固定される環状部と該環状部に径方向外側端部が連結され放射状に配置されるティース部とを有するコアを備え、前記コアは、前記環状部を周方向に分割した分割環状部と該分割環状部の略直交方向に延びる前記ティース部とを有する複数の分割コア部から構成され、前記分割コア部は、第１及び第２積層部材が交互に積層されて形成され、前記第１積層部材の前記分割環状部と対応した周方向一端は周方向他端より前記ティース部からの長さが長く形成され、同周方向一端の径方向外側には軸方向から見て周方向に半円未満で突出する円弧凸状の円弧凸部が形成され同周方向他端の径方向外側には周方向に円弧凹状の円弧凹部が形成され、前記第２積層部材の前記分割環状部と対応した周方向一端は周方向他端より前記ティース部からの長さが短く形成され、同周方向一端の径方向外側には軸方向から見て周方向に円弧凹状の円弧凹部が形成され同周方向他端の径方向外側には周方向に半円未満で突出する円弧凸状の円弧凸部が形成され、複数の前記分割コア部が配列された状態で前記円弧凸部が隣り合う前記分割コア部の前記円弧凹部に嵌められて、前記円弧凸部及び前記円弧凹部の周方向端面が隣り合う前記分割コア部の回動を案内する回動案内面を構成し、前記円弧凸部及び前記円弧凹部より径方向内側の周方向端面が隣り合う前記分割コア部の回動の終端位置で当接する終端当接面を構成し、複数の前記分割コア部が環状に配列され前記ハウジングに内嵌されることで、それらの相対移動が規制されるようにした。   According to a seventh aspect of the present invention, there is provided a brushless motor comprising a stator fixed to the inner periphery of a substantially cylindrical housing and a rotor accommodated inside the stator, wherein the stator is an inner periphery of the housing. And a core having a radially outer end connected to the annular portion and a radially disposed tooth portion, the core being divided annular portions obtained by dividing the annular portion in the circumferential direction; The divided annular portion includes a plurality of divided core portions extending in a substantially orthogonal direction, and the divided core portion is formed by alternately laminating first and second laminated members, One end in the circumferential direction corresponding to the divided annular portion of the laminated member is formed to be longer from the tooth portion than the other end in the circumferential direction, and radially outward of the one end in the circumferential direction is half in the circumferential direction when viewed from the axial direction. A protruding circle that is less than a circle A convex arc convex portion is formed, and an arc concave portion having an arc concave shape is formed in the circumferential direction on the radially outer side of the other end in the circumferential direction, and one end in the circumferential direction corresponding to the divided annular portion of the second laminated member is a circumference. The length from the teeth portion is shorter than the other end in the direction, and a circular arc concave portion is formed in the circumferential direction when viewed from the axial direction on the radially outer side of the same circumferential direction. An arc-shaped convex portion that protrudes less than a semicircle in the circumferential direction is formed on the outer side, and the arc-shaped concave portion of the divided core portion adjacent to the arc-shaped convex portion in a state where a plurality of the divided core portions are arranged. The circular convex portion and the circumferential end surface of the circular arc recess constitute a rotation guide surface that guides the rotation of the adjacent divided core portion, and are radially inward from the circular arc protrusion and the circular arc recess. The circumferential end surfaces of the divided core portions abut at the end position of rotation of the divided core portions adjacent to each other. Constitute the end contact surface, a plurality of the divided core portions by being fitted in the housing arranged in a ring, and the like move their relative is restricted.

請求項８に記載の発明は、請求項１、２、３、４、６、７のいずれか１項に記載のブラシレスモータにおいて、前記ハウジングと環状に配列された複数の前記分割コア部は、焼きばめにて固定された。   The invention according to claim 8 is the brushless motor according to any one of claims 1, 2, 3, 4, 6, and 7, wherein the plurality of divided core portions arranged annularly with the housing include: Fixed by shrink fitting.

請求項９に記載の発明は、請求項１、２、３、４、６、７、８のいずれか１項に記載のブラシレスモータにおいて、前記ハウジングは、前記コアより線膨張率が大きい材料よりなる。   The invention according to claim 9 is the brushless motor according to any one of claims 1, 2, 3, 4, 6, 7, and 8, wherein the housing is made of a material having a larger linear expansion coefficient than the core. Become.

請求項１０に記載の発明は、請求項１乃至９のいずれか１項に記載のブラシレスモータにおける前記ロータは、車両操舵軸の作動をアシストするためのものであるパワーステアリング装置用モータを要旨とする。   A tenth aspect of the present invention is a power steering apparatus motor in which the rotor of the brushless motor according to any one of the first to ninth aspects is for assisting an operation of a vehicle steering shaft. To do.

（作用）
請求項１に記載の発明によれば、環状部の外周面がハウジングに圧着するように即ち複数の分割コア部の相対移動が規制されるように内嵌されるので、従来技術のようなピンが不要となったり、分割環状部同士の溶接等が不要若しくは少しの溶接で剛性が保たれる。また、周方向に円弧状に形成された円弧凹凸部が互いに回動案内面を形成することにより、回動させて隣り合うティース部間を広げて巻線巻装を容易とするとともに、径方向外側あるいは多少径方向からずれた方向から外力が加わっても、円弧凹凸面であって広い面で外力を受け止めることができ、応力集中の防止、ひいてはコアの変形を抑制できる。 (Function)
According to the first aspect of the present invention, since the outer peripheral surface of the annular portion is fitted to the housing so that the relative movement of the plurality of divided core portions is restricted, the pin as in the prior art is used. Is unnecessary, or welding between the divided annular portions is unnecessary, or rigidity is maintained by a little welding. In addition, the circular arc-shaped irregularities formed in a circular arc shape in the circumferential direction form a rotation guide surface with each other, thereby rotating and widening between adjacent tooth portions to facilitate winding winding, and in the radial direction Even if an external force is applied from the outside or a direction slightly deviated from the radial direction, the external force can be received by a wide surface which is an arcuate uneven surface, and stress concentration can be prevented, and hence deformation of the core can be suppressed.

請求項２に記載の発明によれば、複数の分割コア部が配列された状態で隣り合う分割コア部の円弧凸部同士が軸方向に重なり合うため、隣り合う分割環状部間の磁気抵抗が小さくなり磁気回路が良好となる。又、分割コア部同士が軸方向にズレることが防止される。   According to the second aspect of the present invention, since the arc convex portions of the adjacent divided core portions overlap in the axial direction in a state where the plurality of divided core portions are arranged, the magnetic resistance between the adjacent divided annular portions is small. Therefore, the magnetic circuit is improved. Further, the split core portions are prevented from being displaced in the axial direction.

しかも、第１及び第２積層部材の分割環状部と対応した周方向端部の円弧凸状及び円弧凹状により、複数の分割コア部が配列された状態で隣り合う分割コア部の回動が（案内されて）許容されるため、隣り合う分割コア部を回動させ、隣り合うティース部の先端部同士の間隔を広げた状態とすることができる。その結果、前記間隔を広げた状態で巻線を巻装することで、隣り合うティース部が邪魔になることなく、巻線を容易に巻装することができる。しかも、巻線が巻装された分割コア部を回動させるだけで容易に環状とすることができる。   In addition, the rotation of the adjacent divided core portions in the state where the plurality of divided core portions are arranged by the circular arc shape and the circular arc concave shape of the circumferential end corresponding to the divided annular portions of the first and second laminated members ( Since it is permitted), the adjacent split core portions can be rotated to increase the distance between the tip portions of the adjacent tooth portions. As a result, by winding the windings in a state where the interval is widened, the windings can be easily wound without the adjacent teeth portions interfering with each other. In addition, it is possible to easily form a ring by simply rotating the divided core portion around which the winding is wound.

しかも、複数の分割コア部が環状に配列された状態でハウジングに内嵌されることで、それらの相対移動（前記回動及び径方向の移動）が規制されるため、特に前記相対移動を規制するための手段、例えば従来技術のようなピンや、分割環状部同士の溶接等が不要となる。   In addition, the relative movement (the rotation and the movement in the radial direction) of the plurality of divided core portions that are fitted into the housing in a state of being annularly arranged is restricted, and thus the relative movement is particularly restricted. For this purpose, for example, pins as in the prior art, welding of the divided annular portions, and the like are not required.

さらに、周方向に円弧状に形成された円弧凹部及び円弧凸部が回動を許容するように設定されていることにより、例えば、径方向外側あるいは多少径方向からズレた方向から外力が加わっても、円弧凹凸面であって広い面で外力を受け止めることができ、応力集中の防止、ひいてはコアの変形を抑制できる。   Furthermore, since the circular arc concave portion and the circular arc convex portion formed in an arc shape in the circumferential direction are set so as to allow the rotation, for example, an external force is applied from the radially outer side or a direction slightly deviated from the radial direction. However, it is an arc uneven surface and can receive an external force on a wide surface, so that stress concentration can be prevented and, in turn, deformation of the core can be suppressed.

請求項３に記載の発明によれば、円弧凸部及び円弧凹部における円弧凹状の円弧は、その円弧を含む円周上において前記環状部の径方向における最も内側の点を含むため、円弧凸部側がハウジングの内周と円弧凹部の前記最も内側の点との間で径方向の移動が規制される。これにより、隣り合う分割コア部における円弧凹部と円弧凸部とが径方向にずれ難くなり、環状部の真円度を高くすることができる。   According to the third aspect of the present invention, the arc-shaped concave arc in the arc-shaped convex portion and the arc-shaped concave portion includes the innermost point in the radial direction of the annular portion on the circumference including the arc. Movement in the radial direction is restricted between the inner circumference of the housing and the innermost point of the arc recess. Thereby, the circular arc concave part and the circular arc convex part in an adjacent division | segmentation core part become difficult to shift | deviate to radial direction, and the roundness of an annular part can be made high.

請求項４に記載の発明によれば、円弧凸部の周方向に突出する円弧は、半円未満からなり、円弧凸部の周方向の出っ張りが少ないため、各分割コア部において軸方向に並設されることになる円弧凸部の軸方向の間隔（その隙間）の寸法精度が高くなる（円弧凸部の周方向の出っ張りが多いとその先端部が軸方向に変位し易いが、その変位がし難くなる）。よって、例えば、分割コア部同士を軸直交方向に移動させてそれらの円弧凸部同士を重ね合う際（円弧凹部に円弧凸部を嵌める際）の組み付けが容易となる。   According to the fourth aspect of the present invention, the arc protruding in the circumferential direction of the arc convex portion is formed of less than a semicircle, and the protruding portion in the circumferential direction of the arc convex portion is small. Dimensional accuracy of the axial interval (the gap) between the arc projections to be provided increases (the tip of the arc projection is easily displaced in the axial direction if there are many circumferential projections of the arc projection, but the displacement It becomes difficult to). Therefore, for example, when the split core portions are moved in the axis-orthogonal direction and the arc convex portions are overlapped with each other (when the arc convex portions are fitted into the arc concave portions), assembling becomes easy.

請求項５に記載の発明によれば、円弧凸部及び円弧凹部における円弧凹状の円弧は、その円弧を含む円周上において前記環状部の径方向における最も内側の点を含むため、円弧凸部側がハウジング等の内周と円弧凹部の前記最も内側の点との間で径方向の移動が規制される。これにより、隣り合う分割コア部における円弧凹部と円弧凸部とが径方向にずれ難くなり、環状部の真円度を高くすることができる。又、周方向に円弧状に形成された円弧凹凸部が互いに回動案内面を形成することにより、回動させて隣り合うティース部間を広げて巻線巻装を容易とするとともに、径方向外側あるいは多少径方向からずれた方向から外力が加わっても、円弧凹凸面であって広い面で外力を受け止めることができ、応力集中の防止、ひいてはコアの変形を抑制できる。   According to the fifth aspect of the present invention, the arc-shaped concave arc in the arc-shaped convex portion and the arc-shaped concave portion includes the innermost point in the radial direction of the annular portion on the circumference including the arc. Movement in the radial direction is restricted between the inner periphery of the housing or the like and the innermost point of the circular arc recess. Thereby, the circular arc concave part and the circular arc convex part in an adjacent division | segmentation core part become difficult to shift | deviate to radial direction, and it can make roundness of an annular part high. In addition, the circular arc-shaped irregularities formed in a circular arc shape in the circumferential direction form a rotation guide surface, thereby rotating and widening between adjacent tooth portions to facilitate winding winding, and in the radial direction Even if an external force is applied from the outside or a direction slightly deviated from the radial direction, the external force can be received by a wide surface which is an arcuate uneven surface, and stress concentration can be prevented, and hence deformation of the core can be suppressed.

請求項６に記載の発明によれば、積層部材又は第１及び第２積層部材の分割環状部と対応した周方向端部における円弧凸部及び円弧凹部より環状部の径方向内側には、隣り合う分割コア部の回動の終端位置で当接する終端当接面が形成されるため、前記終端位置で終端当接面が面接触することになる。よって、隣り合うティース部の先端部同士の間隔を狭くする閉時に終端位置で当接する部分が破損するといったことが防止される。しかも、複数の分割コア部が環状に配列されハウジングに内嵌されることで径方向外側から外力を受けても、終端当接面が面接触するため、終端当接面で強固に支持されることになり、環状部の真円度が低下し難くなる。   According to the sixth aspect of the present invention, the arcuate convex portion and the arc concave portion at the circumferential end corresponding to the divided annular portion of the laminated member or the first and second laminated members are adjacent to the radially inner side of the annular portion. Since the end contact surface that contacts at the end position of rotation of the divided core portions is formed, the end contact surface comes into surface contact at the end position. Therefore, it is possible to prevent the portion that contacts at the end position from being damaged when the gap between the tips of the adjacent teeth portions is closed. In addition, since the plurality of split core portions are arranged in an annular shape and are fitted in the housing, even if an external force is applied from the outside in the radial direction, the end contact surface is in surface contact and is thus firmly supported by the end contact surface. As a result, the roundness of the annular portion is difficult to decrease.

請求項７に記載の発明によれば、複数の分割コア部が配列された状態で円弧凸部が隣り合う分割コア部の円弧凹部に嵌められ、隣り合う分割コア部の円弧凸部同士（円弧凹部から周方向に突出した部分同士）が軸方向に重なり合うため、隣り合う分割環状部間の磁気抵抗が小さくなり磁気回路が良好となる。又、分割コア部同士が軸方向にズレることが防止される。又、第１積層部材の分割環状部と対応した周方向一端は周方向他端よりティース部からの長さが長く形成され、第２積層部材の分割環状部と対応した周方向一端は周方向他端よりティース部からの長さが短く形成される。よって、第１積層部材の分割環状部と対応した周方向一端の円弧凸部が形成されない径方向内側の部分と、第２積層部材の分割環状部と対応した周方向他端の円弧凸部が形成されない径方向内側の部分とにおいても軸方向に重なり合うため、隣り合う分割環状部間の磁気抵抗が更に小さくなり磁気回路が更に良好となる。又、分割コア部同士が軸方向にズレることが更に防止される。   According to the seventh aspect of the present invention, the arc convex portions are fitted into the arc concave portions of the adjacent divided core portions in a state where the plurality of divided core portions are arranged, and the arc convex portions of the adjacent divided core portions (arc Since the portions protruding in the circumferential direction from the recesses overlap in the axial direction, the magnetic resistance between the adjacent divided annular portions is reduced, and the magnetic circuit is improved. Further, the split core portions are prevented from being displaced in the axial direction. Further, one end in the circumferential direction corresponding to the divided annular portion of the first laminated member is formed to be longer from the tooth portion than the other circumferential end, and one end in the circumferential direction corresponding to the divided annular portion of the second laminated member is circumferential. The length from the teeth portion is shorter than the other end. Therefore, there is a radially inner portion where the circular convex portion at one circumferential end corresponding to the divided annular portion of the first laminated member is not formed, and an arc convex portion at the other circumferential end corresponding to the divided annular portion of the second laminated member. Even in the radially inner portion that is not formed, it overlaps in the axial direction, so that the magnetic resistance between adjacent divided annular portions is further reduced, and the magnetic circuit is further improved. Further, the split core portions are further prevented from being displaced in the axial direction.

しかも、複数の分割コア部が配列された状態で円弧凸部が隣り合う分割コア部の円弧凹部に嵌められて、円弧凸部及び円弧凹部の周方向端面が隣り合う分割コア部の回動を案内する回動案内面を構成するため、隣り合う分割コア部を容易に回動させることができ、隣り合うティース部の先端部同士の間隔を広げた状態とすることができる。その結果、前記間隔を広げた状態で巻線を巻装することで、隣り合うティース部が邪魔になることなく、巻線を容易に巻装することができる。しかも、巻線が巻装された分割コア部を回動させるだけで容易に環状とすることができる。   In addition, with the plurality of divided core portions arranged, the arc convex portions are fitted into the arc concave portions of the adjacent divided core portions, and the circumferential core end surfaces of the arc convex portions and the arc concave portions are rotated. Since the rotation guide surface to guide is comprised, the adjacent division | segmentation core part can be rotated easily, and it can be set as the state which expanded the space | interval of the front-end | tip parts of an adjacent teeth part. As a result, by winding the windings in a state where the interval is widened, the windings can be easily wound without the adjacent teeth portions interfering with each other. In addition, it is possible to easily form a ring by simply rotating the divided core portion around which the winding is wound.

さらに、第１及び第２積層部材における円弧凸部及び円弧凹部より径方向内側の周方向端面が隣り合う分割コア部の回動の終端位置で当接する終端当接面を構成するため、前記終端位置で終端当接面が面接触することになり、隣り合うティース部の先端部同士の間隔を狭くする閉時に終端位置で当接する部分が破損するといったことが防止される。しかも、複数の分割コア部が環状に配列されハウジングに内嵌されることで径方向外側から外力を受けても、終端当接面が面接触するため、終端当接面で強固に支持されることになり、環状部の真円度が低下し難くなる。   Furthermore, in order to constitute the terminal contact surface in which the circumferential end surface radially inward from the circular arc convex portion and the circular arc concave portion in the first and second laminated members contacts at the terminal end position of rotation of the adjacent divided core portion, The end contact surface comes into surface contact at the position, and it is possible to prevent the contact portion at the end position from being damaged at the time of closing when the distance between the tips of adjacent teeth portions is narrowed. In addition, since the plurality of split core portions are arranged in an annular shape and are fitted in the housing, even if an external force is applied from the outside in the radial direction, the end contact surface is in surface contact and is thus firmly supported by the end contact surface. As a result, the roundness of the annular portion is difficult to decrease.

さらに、複数の分割コア部が環状に配列されてハウジングに内嵌されることで、それらの相対移動（前記回動及び径方向の移動）が規制されるため、特に前記相対移動を規制するための手段、例えば従来技術のようなピンや、分割環状部同士の溶接等が不要となる。   Further, since the plurality of divided core portions are arranged in a ring and are fitted in the housing, their relative movement (the rotation and the movement in the radial direction) is restricted, so that the relative movement is particularly restricted. This means, for example, pins as in the prior art, welding of the divided annular portions, and the like are not required.

さらに、円弧凸部は周方向に半円未満で突出し、円弧凸部の周方向の出っ張りが少ないため、各分割コア部において軸方向に並設されることになる円弧凸部の軸方向の間隔（その隙間）の寸法精度が高くなる（円弧凸部の周方向の出っ張りが多いとその先端部が軸方向に変位し易いが、その変位がし難くなる）。よって、例えば、分割コア部同士を軸直交方向に移動させてそれらの円弧凸部同士を重ね合う際（円弧凹部に円弧凸部を嵌める際）の組み付けが容易となる。   Furthermore, since the arc convex part protrudes in less than a semicircle in the circumferential direction and there are few protrusions in the circumferential direction of the arc convex part, the axial distance between the arc convex parts that are arranged in parallel in the axial direction in each divided core part The dimensional accuracy of (the gap) becomes high (if there are many protrusions in the circumferential direction of the arc-shaped convex part, the tip part is easily displaced in the axial direction, but the displacement is difficult). Therefore, for example, when the split core portions are moved in the axis-orthogonal direction and the arc convex portions are overlapped with each other (when the arc convex portions are fitted into the arc concave portions), assembling becomes easy.

請求項８に記載の発明によれば、ハウジングと環状に配列された複数の分割コア部は、焼きばめにて固定されるため、環状に配列された複数の分割コア部が径方向外側から大きな外力を受けそれらの連結が強固になる。   According to the invention described in claim 8, since the plurality of divided core portions arranged in a ring shape with the housing are fixed by shrink fitting, the plurality of divided core portions arranged in a ring shape from the outside in the radial direction. The connection is strengthened by receiving a large external force.

請求項９に記載の発明によれば、前記ハウジングは、前記コアより線膨張率が大きい材料よりなるため、ハウジングの収縮によりコアに大きな応力が生じる場合があるが、前記円弧凹凸部によりコアの変形を抑制できる。又、焼きばめを容易に行うことができる。   According to the invention described in claim 9, since the housing is made of a material having a linear expansion coefficient larger than that of the core, a large stress may be generated in the core due to contraction of the housing. Deformation can be suppressed. Moreover, shrink fitting can be performed easily.

請求項１０に記載の発明によれば、ロータが車両操舵軸の作動をアシストするためのものであるパワーステアリング装置用モータであるため、路面近傍に配置され、飛石の衝撃等が加わる虞がある。そして、ハウジングにマグネットが固着されたモータ等ではマグネットが衝撃に弱いことからハウジングを剛性の高い鉄材等にて形成する必要があるが、その必要がなくハウジングを軽量な材料で且つ板厚を薄くすることができる。よって、請求項１乃至９のいずれか１項に記載の発明の効果に加えて、パワーステアリング装置用モータの軽量化を図りながら、（マグネットが破損しないため）その信頼性を向上することができる。   According to the tenth aspect of the present invention, since the rotor is a motor for a power steering device that assists the operation of the vehicle steering shaft, the rotor is disposed in the vicinity of the road surface, and there is a risk that a stepping stone impact or the like is applied. . And in motors with magnets fixed to the housing, the magnets are vulnerable to shocks, so the housing needs to be made of a highly rigid iron material, but this is not necessary, and the housing is made of a lightweight material and thin in thickness. can do. Therefore, in addition to the effect of the invention according to any one of claims 1 to 9, the reliability of the power steering device motor can be improved while the weight of the motor for the power steering device is reduced (because the magnet is not damaged). .

請求項１〜９に記載の発明によれば、巻線を容易に巻装することができ、巻線後の環状化を容易とすることができ、容易に分割コア部の相対移動を規制することができるブラシレスモータを提供することができる。   According to the first to ninth aspects of the present invention, the winding can be easily wound, the annularization after the winding can be facilitated, and the relative movement of the divided core portion is easily regulated. The brushless motor which can be provided can be provided.

又、請求項１０に記載の発明によれば、巻線を容易に巻装することができ、巻線後の環状化を容易とすることができ、容易に分割コア部の相対移動を規制することができるパワーステアリング装置用モータを提供することができる。   According to the invention described in claim 10, the winding can be easily wound, the annularization after the winding can be facilitated, and the relative movement of the divided core portion is easily regulated. It is possible to provide a motor for a power steering device that can be used.

以下、本発明を図示しない車両のステアリングホイールに連結され車両操舵軸の作動をアシストするためのパワーステアリング装置用モータに具体化した一実施の形態を図１〜図１２に従って説明する。図１に示すように、パワーステアリング装置用モータとしてのブラシレスモータは、ステータ１と、ステータ１と対向配置されるマグネット（図示略）を有しステータ１の内側に収容されるロータ２（図中、一点鎖線で示す）と、ハウジング３とを備える。尚、ロータ２は、図示しない車両操舵軸に連結されることになる。   Hereinafter, an embodiment in which the present invention is embodied in a motor for a power steering apparatus that is connected to a steering wheel of a vehicle (not shown) and assists the operation of a vehicle steering shaft will be described with reference to FIGS. As shown in FIG. 1, a brushless motor as a motor for a power steering device includes a stator 1 and a rotor 2 (not shown) having a magnet (not shown) arranged opposite to the stator 1 and housed inside the stator 1. , And a housing 3. The rotor 2 is connected to a vehicle steering shaft (not shown).

ステータ１は、略筒状のハウジング３内に配設され、インシュレータ４を介して巻線５が巻装されるコアとしてのステータコア６を備える。ステータコア６は鉄系の磁性材料よりなり、ハウジング３はステータコア６より軽い材料よりなる。又、ハウジング３は、ステータコア６より線膨張率が大きい材料よりなる。本実施の形態では、ハウジング３は、アルミ系金属よりなる。   The stator 1 is provided in a substantially cylindrical housing 3 and includes a stator core 6 as a core around which a winding 5 is wound via an insulator 4. The stator core 6 is made of an iron-based magnetic material, and the housing 3 is made of a lighter material than the stator core 6. The housing 3 is made of a material having a larger linear expansion coefficient than the stator core 6. In the present embodiment, the housing 3 is made of an aluminum-based metal.

ステータコア６は、放射状に配置され巻線５が巻装される複数のティース部７と、その各ティース部７の径方向外側端部を連結し前記ハウジング３の内周に固定される環状部８とを備える（図１２参照）。尚、本実施の形態では、ティース部７は、等角度（３０度）間隔に１２個形成されている。   The stator core 6 includes a plurality of teeth 7 that are radially arranged and wound with the winding 5, and an annular portion 8 that is fixed to the inner periphery of the housing 3 by connecting the radially outer ends of the teeth 7. (See FIG. 12). In the present embodiment, twelve teeth portions 7 are formed at equiangular (30 degree) intervals.

詳しくは、ステータコア６は、図４（ａ）〜（ｃ）に示すように、周方向に（ティース部７毎に）分割された形状で互いの回動が許容される複数（本実施の形態では１２個）の分割コア部１３から構成される。各分割コア部１３は、積層部材としての第１積層部材１１（図２参照）と、第２積層部材１２（図３参照）とが交互に積層されて形成される。   Specifically, as shown in FIGS. 4A to 4C, the stator core 6 has a plurality of shapes (this embodiment) that are allowed to rotate with each other in a shape divided in the circumferential direction (for each tooth portion 7). 12 pieces) of divided core portions 13. Each divided core portion 13 is formed by alternately laminating first laminated members 11 (see FIG. 2) as laminated members and second laminated members 12 (see FIG. 3).

第１積層部材１１は、図２（ａ）（ｂ）に示すように、弧状に延びる積層前分割環状部１１ａと、積層前分割環状部１１ａの中間部から略直交方向（前記弧状の軸中心方向）に延びる積層前ティース部１１ｂとを有する。積層前ティース部１１ｂの先端部には、周方向に延びる積層前突片１１ｃが形成されている。又、積層前ティース部１１ｂには、板厚方向（軸方向）の一方（図２（ｂ）中、上方）に第１嵌合凹部１１ｄが形成され、且つ板厚方向の他方（図２（ｂ）中、下方）に第１嵌合凸部１１ｅが形成されている。第１嵌合凹部１１ｄと第１嵌合凸部１１ｅは、板厚方向に並んで形成されるとともに、その組が積層前ティース部１１ｂの延設方向に２つ並んで形成されている。   As shown in FIGS. 2 (a) and 2 (b), the first laminated member 11 includes a pre-stacked divided annular portion 11a extending in an arc shape, and a substantially orthogonal direction from the intermediate portion of the pre-stacked divided annular portion 11a (the arc-shaped axial center). And a pre-lamination tooth portion 11b extending in the direction). A pre-lamination protrusion 11c extending in the circumferential direction is formed at the tip of the pre-lamination tooth portion 11b. The pre-lamination tooth portion 11b is formed with a first fitting recess 11d in one of the plate thickness directions (axial directions) (upward in FIG. 2B) and the other in the plate thickness direction (FIG. 2 ( b) The first fitting convex portion 11e is formed in the lower side. The first fitting concave portion 11d and the first fitting convex portion 11e are formed side by side in the plate thickness direction, and two sets thereof are formed side by side in the extending direction of the pre-lamination tooth portion 11b.

又、積層前分割環状部１１ａの周方向の一端部（図２中、左側端部）には、軸方向から見て（図２（ａ）参照）周方向に円弧凸状の円弧凸部１１ｆが形成されている。又、積層前分割環状部１１ａの周方向の他端部（図２中、右側端部）には、軸方向から見て（図２（ａ）参照）周方向に円弧凹状の円弧凹部１１ｇが形成されている。即ち、積層前分割環状部１１ａの周方向両端部には、複数の第１積層部材１１を側方に配列した際（図２（ａ）参照）に、それぞれが嵌って（案内しながら）第１積層部材１１同士の回動を許容するように円弧凸部１１ｆと円弧凹部１１ｇが形成されている。   In addition, at one end portion (left end portion in FIG. 2) in the circumferential direction of the divided annular portion 11a before stacking, an arc convex portion 11f having a circular arc shape in the circumferential direction when viewed from the axial direction (see FIG. 2A). Is formed. In addition, an arc recess 11g having an arc recess shape in the circumferential direction when viewed from the axial direction (see FIG. 2 (a)) is provided at the other circumferential end (the right end in FIG. 2) of the annular portion 11a before lamination. Is formed. That is, when the plurality of first laminated members 11 are arranged laterally (see FIG. 2A) at both ends in the circumferential direction of the divided annular portion 11a before lamination, An arc convex portion 11f and an arc concave portion 11g are formed so as to allow the rotation of the one laminated member 11 to each other.

本実施の形態の円弧凸部１１ｆ及び円弧凹部１１ｇにおける円弧凹状の円弧は、その円弧を含む円周上において前記環状部８の径方向における最も内側の点（径方向最内点）を含むように設定されている。又、積層前分割環状部１１ａの周方向端部における円弧凸部１１ｆ及び円弧凹部１１ｇより環状部８の径方向内側には、隣り合う分割コア部１３の回動の（閉時の）終端位置で当接する終端当接面としての周方向当接面１１ｈが形成されている。周方向当接面１１ｈは、前記環状部８の径方向に延び（即ち放射状に形成され）回動の終端位置で周方向に当接するように形成されている。又、前記円弧凸状及び前記円弧凹状の円弧の中心は、軸方向から見て前記周方向当接面１１ｈの延長線上に設定されている。尚、本実施の形態における前記円弧凸状の円弧は略半円形状である。又、前記円弧凹状の円弧は９０度の円弧（円の１／４）である。そして、積層前分割環状部１１ａの周方向他端部における円弧凹部１１ｇより環状部８の径方向外側には、環状部８の径方向外側に延びる直線部１１ｉが形成されている。   The arc concave arc in the arc convex portion 11f and the arc concave portion 11g of the present embodiment includes the innermost point (radially innermost point) in the radial direction of the annular portion 8 on the circumference including the arc. Is set to Further, the end position of the rotation of the adjacent divided core portion 13 (when closed) is located on the radially inner side of the annular portion 8 from the circular arc convex portion 11f and the circular arc concave portion 11g at the circumferential end portion of the divided annular portion 11a before lamination. A circumferential contact surface 11h is formed as a terminal contact surface that makes contact at The circumferential contact surface 11h extends in the radial direction of the annular portion 8 (that is, is formed radially) so as to contact the circumferential direction at the end position of rotation. Further, the centers of the arc convex shape and the arc concave arc are set on an extension line of the circumferential contact surface 11h when viewed from the axial direction. In the present embodiment, the arc-shaped convex arc has a substantially semicircular shape. The concave arc is a 90 degree arc (1/4 of a circle). A linear portion 11 i extending radially outward of the annular portion 8 is formed on the radially outer side of the annular portion 8 from the circular arc recess 11 g at the other circumferential end of the pre-stacked annular portion 11 a.

第２積層部材１２は、図３（ａ）（ｂ）に示すように、第１積層部材１１と対称形状に形成されている。即ち、第２積層部材１２は、弧状に延びる積層前分割環状部１２ａと、積層前分割環状部１２ａの中間部から略直交方向（前記弧状の軸中心方向）に延びる積層前ティース部１２ｂとを有する。積層前ティース部１２ｂの先端部には、周方向に延びる積層前突片１２ｃが形成されている。又、積層前ティース部１２ｂには、板厚方向（軸方向）の一方（図３（ｂ）中、上方）に第２嵌合凹部１２ｄが形成され、且つ板厚方向の他方（図３（ｂ）中、下方）に第２嵌合凸部１２ｅが形成されている。第２嵌合凹部１２ｄと第２嵌合凸部１２ｅは、板厚方向に並んで形成されるとともに、その組が積層前ティース部１２ｂの延設方向に２つ並んで形成されている。   As shown in FIGS. 3A and 3B, the second laminated member 12 is formed symmetrically with the first laminated member 11. That is, the second laminated member 12 includes a pre-lamination divided annular portion 12a that extends in an arc shape, and a pre-lamination tooth portion 12b that extends in an approximately orthogonal direction (the arc-shaped axial center direction) from an intermediate portion of the pre-laminate divided annular portion 12a. Have. A pre-lamination protrusion 12c extending in the circumferential direction is formed at the tip of the pre-lamination tooth portion 12b. Further, the pre-lamination tooth portion 12b has a second fitting recess 12d formed on one side in the plate thickness direction (axial direction) (upward in FIG. 3B) and the other in the plate thickness direction (FIG. The second fitting convex part 12e is formed in b) in the lower part. The second fitting concave portion 12d and the second fitting convex portion 12e are formed side by side in the plate thickness direction, and two sets thereof are formed side by side in the extending direction of the pre-lamination tooth portion 12b.

又、積層前分割環状部１２ａの周方向の他端部（図３中、右側端部）には、軸方向から見て（図３（ａ）参照）周方向に円弧凸状の円弧凸部１２ｆが形成されている。又、積層前分割環状部１２ａの周方向の一端部（図３中、左側端部）には、軸方向から見て（図３（ａ）参照）周方向に円弧凹状の円弧凹部１２ｇが形成されている。即ち、積層前分割環状部１２ａの周方向両端部には、複数の第２積層部材１２を側方に配列した際（図３（ａ）参照）に、それぞれが嵌って（案内しながら）第２積層部材１２同士の回動を許容するように円弧凸部１２ｆと円弧凹部１２ｇが形成されている。   In addition, the other end (the right end in FIG. 3) in the circumferential direction of the divided annular portion 12a before stacking is an arc-shaped convex portion that is arc-shaped in the circumferential direction when viewed from the axial direction (see FIG. 3 (a)). 12f is formed. In addition, an arc concave portion 12g having an arc concave shape is formed in the circumferential direction when viewed from the axial direction (see FIG. 3A) at one end portion (left end portion in FIG. 3) in the circumferential direction of the divided annular portion 12a before lamination. Has been. That is, when the plurality of second laminated members 12 are arranged laterally at both ends in the circumferential direction of the divisional annular portion 12a before lamination (see FIG. 3A), each is fitted (while guiding). An arc convex portion 12f and an arc concave portion 12g are formed so as to allow the two laminated members 12 to rotate.

本実施の形態の円弧凸部１２ｆ及び円弧凹部１２ｇにおける円弧凹状の円弧は、その円弧を含む円周上において前記環状部８の径方向における最も内側の点（径方向最内点）を含むように設定されている。又、積層前分割環状部１２ａの周方向端部における円弧凸部１２ｆ及び円弧凹部１２ｇより環状部８の径方向内側には、隣り合う分割コア部１３の回動の（閉時の）終端位置で当接する終端当接面としての周方向当接面１２ｈが形成されている。周方向当接面１２ｈは、前記環状部８の径方向に延び（即ち放射状に形成され）回動の終端位置で周方向に当接するように形成されている。又、前記円弧凸状及び前記円弧凹状の円弧の中心は、軸方向から見て前記周方向当接面１２ｈの延長線上に設定されている。尚、本実施の形態における前記円弧凸状の円弧は略半円形状である。又、前記円弧凹状の円弧は９０度の円弧（円の１／４）である。そして、積層前分割環状部１２ａの周方向一端部における円弧凹部１２ｇより環状部８の径方向外側には、環状部８の径方向外側に延びる直線部１２ｉが形成されている。   The arc concave arc in the arc convex portion 12f and the arc concave portion 12g of the present embodiment includes the innermost point (radially innermost point) in the radial direction of the annular portion 8 on the circumference including the arc. Is set to In addition, the end position of the rotation of the adjacent divided core portion 13 (when closed) is located on the radially inner side of the annular portion 8 from the circular arc convex portion 12f and the circular arc concave portion 12g at the circumferential end portion of the divided annular portion 12a before lamination. A circumferential abutment surface 12h is formed as a terminal abutment surface that abuts at. The circumferential contact surface 12h extends in the radial direction of the annular portion 8 (that is, is formed radially) so as to contact in the circumferential direction at the end position of rotation. Further, the centers of the arc convex shape and the arc concave shape are set on an extension line of the circumferential contact surface 12h when viewed from the axial direction. In the present embodiment, the arc-shaped convex arc has a substantially semicircular shape. The concave arc is a 90 degree arc (1/4 of a circle). A linear portion 12 i extending radially outward of the annular portion 8 is formed on the radially outer side of the annular portion 8 with respect to the circular arc recess 12 g at one circumferential end of the annular portion 12 a before lamination.

そして、第１積層部材１１と第２積層部材１２とが交互に（本実施の形態では５段ずつ）積層されることで、図４に示すように、積層前分割環状部１１ａ，１２ａよりなる分割環状部１３ａと積層前ティース部１１ｂ，１２ｂよりなる前記ティース部７とを有する分割コア部１３が形成される。この際、第１及び第２積層部材１１，１２は、第１嵌合凸部１１ｅが第２嵌合凹部１２ｄに圧入嵌合され、第２嵌合凸部１２ｅが第１嵌合凹部１１ｄに圧入嵌合されることで固定されて、分割コア部１３が形成される。この分割コア部１３における分割環状部１３ａの周方向の一端部は、円弧凸部１１ｆと円弧凹部１２ｇにより凹凸を繰り返す形状とされ、同周方向の他端部は、円弧凸部１２ｆと円弧凹部１１ｇにより凹凸を繰り返す形状とされる（図４（ｂ）参照）。そして、複数の分割コア部１３が例えば分割環状部１３ａの長手方向（図４（ａ）の左右方向であって、矢印Ｘ方向）に移動されるなどにより前記凹凸が互いに嵌め合わされた後に環状に配列されることで、分割環状部１３ａが前記環状部８を形成し、前記ティース部７が放射状に配置される（図１参照）。尚、この組み付けは、円弧凸部１１ｆ，１２ｆ間同士の凹凸嵌合であるので、特許文献２（特開平７−２２２３８３号公報）に開示される直線状形状の凹凸嵌合に比べ、嵌合が容易である。又、複数の分割コア部１３が配列された状態では、隣り合う前記分割コア部１３における分割環状部１３ａの周方向端部の凹凸が互いに嵌り合って、即ち前記円弧凸部１１ｆ，１２ｆ同士（詳しくは円弧凹部１１ｇ，１２ｇから周方向に突出した部分同士）が軸方向に重なって配置される。又、複数の分割コア部１３が配列された状態では、円弧凸部１１ｆ，１２ｆ及び円弧凹部１１ｇ，１２ｇの円弧状の曲面である回動案内面に、隣り合う分割コア部１３の回動が案内されることになる。即ち、この状態では、前記円弧凹状及び前記円弧凸状により、隣り合う分割コア部１３の回動が（回動案内面に案内されて）許容される。又、前記円弧凹状及び前記円弧凸状は、これら同士では互いに連結するものではない。   Then, the first laminated member 11 and the second laminated member 12 are alternately laminated (5 layers in this embodiment), and as shown in FIG. A split core portion 13 having the split annular portion 13a and the tooth portion 7 composed of the pre-stacking tooth portions 11b and 12b is formed. At this time, in the first and second laminated members 11 and 12, the first fitting convex portion 11e is press-fitted and fitted into the second fitting concave portion 12d, and the second fitting convex portion 12e is fitted into the first fitting concave portion 11d. The split core portion 13 is formed by being fixed by press fitting. One end portion in the circumferential direction of the divided annular portion 13a in the divided core portion 13 has a shape in which irregularities are repeated by an arc convex portion 11f and an arc concave portion 12g, and the other end portion in the same circumferential direction is an arc convex portion 12f and an arc concave portion. It is made into the shape which repeats unevenness by 11g (refer FIG.4 (b)). And after the said unevenness | corrugations are mutually fitted, for example by the several division | segmentation core part 13 moving to the longitudinal direction (the left-right direction of FIG. 4 (a), and arrow X direction) of the division | segmentation annular part 13a, it is cyclic | annular By arranging, the division | segmentation annular part 13a forms the said annular part 8, and the said teeth part 7 is arrange | positioned radially (refer FIG. 1). In addition, since this assembling is a concave / convex fitting between the arc convex portions 11f and 12f, the fitting is compared with the linear concave / convex fitting disclosed in Patent Document 2 (Japanese Patent Laid-Open No. 7-222383). Is easy. Further, in the state in which the plurality of divided core portions 13 are arranged, the concave and convex portions of the circumferential end portions of the divided annular portions 13a in the adjacent divided core portions 13 are fitted to each other, that is, the arc convex portions 11f and 12f ( Specifically, the portions protruding in the circumferential direction from the circular arc recesses 11g, 12g) are arranged so as to overlap in the axial direction. Further, in the state in which the plurality of divided core portions 13 are arranged, the rotation of the adjacent divided core portions 13 on the rotation guide surfaces which are arc-shaped curved surfaces of the arc convex portions 11f and 12f and the arc concave portions 11g and 12g is performed. You will be guided. That is, in this state, the rotation of the adjacent divided core portions 13 is allowed (guided by the rotation guide surface) by the arc concave shape and the arc convex shape. Further, the arc concave shape and the arc convex shape are not connected to each other.

インシュレータ４は、図５〜図８に示すように、分割コア部１３に対応した形状の第１及び第２インシュレータ部材２１，２２よりなる。第１及び第２インシュレータ部材２１，２２は、絶縁性を有する樹脂材よりなる。第１及び第２インシュレータ部材２１，２２は、分割環状部１３ａの軸方向片方の面上に配置される弧状端面部２１ａ，２２ａと、分割環状部１３ａの内周面を覆うための内周端面部２１ｂ，２２ｂとを備える。又、第１及び第２インシュレータ部材２１，２２は、ティース部７の軸方向片方の面を覆うための端面部２１ｃ，２２ｃと、ティース部７の両側面を覆うための一対の側面部２１ｄ，２２ｄとを備える。前記弧状端面部２１ａ，２２ａは、巻装される巻線５の径方向外側へのはみ出しを規制すべく軸方向に突出して形成され、その一部には巻線５を係止可能な係止溝２１ｅ，２２ｅが形成されている。又、前記端面部２１ｃ，２２ｃにおけるティース部７の先端部と対応した端部（図６、図８中、下端部）には、巻装される巻線５の径方向内側へのはみ出しを規制すべく軸方向に立設された内側規制壁２１ｆ，２２ｆが形成されている。   As shown in FIGS. 5 to 8, the insulator 4 includes first and second insulator members 21 and 22 having a shape corresponding to the divided core portion 13. The first and second insulator members 21 and 22 are made of an insulating resin material. The first and second insulator members 21 and 22 are arcuate end surfaces 21a and 22a disposed on one axial surface of the divided annular portion 13a, and inner circumferential end surfaces for covering the inner circumferential surface of the divided annular portion 13a. Parts 21b and 22b. The first and second insulator members 21 and 22 include end surface portions 21c and 22c for covering one axial surface of the tooth portion 7 and a pair of side surface portions 21d and 21d for covering both side surfaces of the tooth portion 7. 22d. The arc-shaped end surface portions 21a and 22a are formed so as to protrude in the axial direction so as to restrict the protrusion of the wound winding 5 to the outside in the radial direction. Grooves 21e and 22e are formed. Further, the end portion (the lower end portion in FIGS. 6 and 8) corresponding to the tip end portion of the tooth portion 7 in the end face portions 21c and 22c is restricted from protruding inward in the radial direction of the winding 5 to be wound. Inner restricting walls 21f and 22f that are erected in the axial direction are formed.

又、図５及び図６に示すように、第１インシュレータ部材２１における前記分割環状部１３ａの周方向端部と対応した位置であって弧状端面部２１ａの周方向端部（両端部）には、軸方向に延びる挿入孔２１ｇが形成されている。この挿入孔２１ｇには、軸直交方向に延びる（図６に示すように軸方向から見て径方向に延びる）鉤状切り欠き部２１ｈが形成されている。尚、本実施の形態の第１インシュレータ部材２１における一対の鉤状切り欠き部２１ｈは、図６に示すように、内側規制壁２１ｆ側（図６中、下側）に向かうほど離間するように（図６中、左斜め下方向と、右斜め下方向に）延びている。   Further, as shown in FIGS. 5 and 6, the first insulator member 21 has a position corresponding to the circumferential end of the divided annular portion 13a and the circumferential end (both ends) of the arcuate end surface portion 21a. An insertion hole 21g extending in the axial direction is formed. The insertion hole 21g is formed with a bowl-shaped notch 21h extending in the direction perpendicular to the axis (extending in the radial direction when viewed from the axial direction as shown in FIG. 6). In addition, as shown in FIG. 6, a pair of hook-shaped notches 21h in the first insulator member 21 of the present embodiment are separated from each other toward the inner regulating wall 21f side (lower side in FIG. 6). (In FIG. 6, it extends in a diagonally downward left direction and a diagonally downward right direction).

又、図７及び図８に示すように、第２インシュレータ部材２２における前記分割環状部１３ａの周方向端部と対応した位置であって弧状端面部２２ａの周方向端部（両端部）には、軸方向に延びる挿入凸部２２ｇが形成されている。この挿入凸部２２ｇには、その先端に軸直交方向に延びる（図８に示すように軸方向から見て径方向に延びる）鉤状突出部２２ｈが形成されている。鉤状突出部２２ｈは、第１インシュレータ部材２１と第２インシュレータ部材２２とが所定の回動角度（相対位置が所定の角度）で挿入凸部２２ｇを挿入孔２１ｇに挿入可能、且つ所定の回動角度以外で挿入凸部２２ｇを挿入孔２１ｇに対して挿抜不能とするように形成されている。即ち、鉤状突出部２２ｈは、前記所定の回動角度でのみ前記鉤状切り欠き部２１ｈと一致するように形成されている。尚、本実施の形態の第２インシュレータ部材２２における一対の鉤状突出部２２ｈは、図８に示すように、内側規制壁２２ｆ側（図８中、下側）に向かうほど離間するように（図８中、左斜め下方向と、右斜め下方向に）延びている。   Further, as shown in FIGS. 7 and 8, the second insulator member 22 is located at a position corresponding to the circumferential end of the divided annular portion 13a and at the circumferential end (both ends) of the arcuate end surface portion 22a. An insertion convex portion 22g extending in the axial direction is formed. The insertion protrusion 22g is formed with a hook-shaped protrusion 22h extending in the direction perpendicular to the axis (extending in the radial direction when viewed from the axis as shown in FIG. 8) at the tip thereof. The hook-shaped protruding portion 22h is capable of inserting the insertion convex portion 22g into the insertion hole 21g at a predetermined rotation angle (relative position is a predetermined angle) between the first insulator member 21 and the second insulator member 22, and at a predetermined time. The insertion convex portion 22g is formed so as not to be inserted into and removed from the insertion hole 21g except for the moving angle. That is, the hook-shaped protrusion 22h is formed so as to coincide with the hook-shaped notch 21h only at the predetermined rotation angle. In addition, as shown in FIG. 8, the pair of hook-shaped protrusions 22h in the second insulator member 22 of the present embodiment is separated so as to be closer to the inner regulation wall 22f side (lower side in FIG. 8) ( In FIG. 8, it extends in the diagonally downward left direction and diagonally downward right.

前記所定の回動角度は、図９に示すように、合わせて１２個（６個ずつ）の第１及び第２インシュレータ部材２１，２２を、ティース部７と対応した側（端面部２１ｃ，２２ｃ等）が外側を向くように、環状に配列した角度に設定されている。このような所定の回動角度では、図１０に示すように、鉤状突出部２２ｈが鉤状切り欠き部２１ｈと一致し、挿入凸部２２ｇを挿入孔２１ｇに挿入可能となる。これにより、第１及び第２インシュレータ部材２１，２２は、図９に示すような状態で挿入凸部２２ｇが挿入孔２１ｇに挿入されることで、交互に配設されるとともに互いに回動可能に連結される。尚、合わせて１２個（６個ずつ）の第１及び第２インシュレータ部材２１，２２の両端部（両端部の第１及び第２インシュレータ部材２１，２２における端部）には、前記挿入孔２１ｇ、及び前記挿入凸部２２ｇが形成されていない。   As shown in FIG. 9, the predetermined rotation angle is such that 12 (6 in total) first and second insulator members 21 and 22 are arranged on the side corresponding to the tooth portion 7 (end surface portions 21c and 22c). Etc.) are set in an annularly arranged angle so that they face outward. At such a predetermined rotation angle, as shown in FIG. 10, the hook-shaped protrusion 22h coincides with the hook-shaped notch 21h, and the insertion protrusion 22g can be inserted into the insertion hole 21g. As a result, the first and second insulator members 21 and 22 are alternately arranged and rotatable with each other by inserting the insertion convex portions 22g into the insertion holes 21g in the state shown in FIG. Connected. In addition, a total of 12 (each 6) first and second insulator members 21 and 22 (the end portions of the first and second insulator members 21 and 22 at both ends) are inserted into the insertion holes 21g. And the insertion convex portion 22g is not formed.

又、図１１は、合わせて１２個（６個ずつ）の第１及び第２インシュレータ部材２１，２２を、ティース部７と対応した側（端面部２１ｃ，２２ｃ等）が内側を向くように、環状に配列した状態を示す。本実施の形態におけるこの状態（図１１参照）は、環状とされたステータコア６（分割コア部１３）と対応した状態、即ち、図１に示すようにステータコア６（分割コア部１３）に装着されて最終的に配置される状態である。この状態（角度）では、鉤状突出部２２ｈが鉤状切り欠き部２１ｈと一致しない（図１１中、部分拡大図参照）ため、挿入孔２１ｇから挿入凸部２２ｇが抜脱不能とされる。   Further, FIG. 11 shows a total of twelve (six) first and second insulator members 21 and 22 such that the side corresponding to the tooth portion 7 (end surface portions 21c, 22c, etc.) faces inward. The state arranged in a circle is shown. This state (see FIG. 11) in the present embodiment is a state corresponding to the annular stator core 6 (divided core portion 13), that is, the stator core 6 (divided core portion 13) is mounted as shown in FIG. And finally placed. In this state (angle), the hook-shaped protrusion 22h does not coincide with the hook-shaped notch 21h (see a partially enlarged view in FIG. 11), so that the insertion protrusion 22g cannot be removed from the insertion hole 21g.

上記のように構成されたインシュレータ４（第１及び第２インシュレータ部材２１，２２）は、前記円弧凸部１１ｆ，１２ｆ同士が軸方向に重なった状態の複数の分割コア部１３（図４参照）に装着されることで、隣り合う分割コア部１３を回動可能に連結する。尚、挿入孔２１ｇ及び挿入凸部２２ｇの軸中心は、前記円弧凸部１１ｆ，１２ｆ及び前記円弧凹部１１ｇ，１２ｇの軸中心と同じに設定されており、該軸中心に隣り合う分割コア部１３が回動可能とされる。又、本実施の形態のインシュレータ４（第１及び第２インシュレータ部材２１，２２）は、分割コア部１３の軸方向に一対、即ち軸方向の一方と他方に上下対称にそれぞれ設けられる。又、この連結は、第１及び第２インシュレータ部材２１，２２が可撓性を有する樹脂材よりなることから、柔軟性を有することになる。即ち、隣り合う分割コア部１３の軸方向から見た位置関係は外力等により各方向に若干量だけ変更可能とされる。   The insulator 4 (first and second insulator members 21 and 22) configured as described above has a plurality of divided core portions 13 in a state where the arc-shaped convex portions 11f and 12f overlap each other in the axial direction (see FIG. 4). By attaching to, the adjacent divided core portions 13 are rotatably connected. The axial centers of the insertion hole 21g and the insertion convex portion 22g are set to be the same as the axial centers of the circular arc convex portions 11f and 12f and the circular arc concave portions 11g and 12g, and the divided core portion 13 adjacent to the axial center. Can be rotated. Further, the insulators 4 (first and second insulator members 21 and 22) of the present embodiment are provided in a pair in the axial direction of the split core portion 13, that is, symmetrically provided on one side and the other side in the axial direction. In addition, this connection has flexibility because the first and second insulator members 21, 22 are made of a flexible resin material. That is, the positional relationship of the adjacent divided core portions 13 viewed from the axial direction can be changed by a slight amount in each direction by an external force or the like.

そして、ティース部７には、隣り合うティース部７の先端部同士の間隔が広げられた状態（開状態）で、インシュレータ４、詳しくは第１及び第２インシュレータ部材２１，２２の端面部２１ｃ，２２ｃ及び側面部２１ｄ，２２ｄを介して巻線５が巻装される。尚、本実施の形態では、ティース部７が平行に延びるように分割コア部１３が直線状に配列された状態であって、第１及び第２インシュレータ部材２１，２２が直線状に配列された状態で巻線５が巻装される。尚、この状態（角度）では、鉤状突出部２２ｈが鉤状切り欠き部２１ｈと一致しないため、挿入孔２１ｇから挿入凸部２２ｇが抜脱不能とされる。よって、巻線５を巻装する際に、第１及び第２インシュレータ部材２１，２２の連結が保持され、第１インシュレータ部材２１及び第２インシュレータ部材２２の少なくとも一方が部分的にステータコア６から脱落してしまう（軸方向にズレる）といったことが防止される。   And in the teeth part 7, in the state (open state) where the space | interval of the front-end | tip parts of the adjacent teeth part 7 was expanded, the end surface part 21c of the insulator 4, specifically, the 1st and 2nd insulator members 21 and 22, Winding 5 is wound through 22c and side surface parts 21d and 22d. In the present embodiment, the split core portions 13 are linearly arranged so that the teeth portions 7 extend in parallel, and the first and second insulator members 21 and 22 are linearly arranged. The winding 5 is wound in the state. In this state (angle), since the hook-shaped protrusion 22h does not coincide with the hook-shaped notch 21h, the insertion protrusion 22g cannot be removed from the insertion hole 21g. Therefore, when winding the winding 5, the connection between the first and second insulator members 21 and 22 is maintained, and at least one of the first insulator member 21 and the second insulator member 22 is partially detached from the stator core 6. It is prevented that this occurs (shift in the axial direction).

そして、図１に示すように、巻線５が巻装された複数の分割コア部１３は、環状に配列された状態（閉状態）でハウジング３に内嵌されることで、それらの相対移動が規制される。即ち、環状に配列された複数の分割コア部１３の外周（環状部８の外周）がハウジング３の内周面に当接され、前記円弧凸部１１ｆ，１２ｆ、前記円弧凹部１１ｇ，１２ｇ、及び周方向当接面１２ｈが係合（当接）し合うことで、複数の分割コア部１３の前記回動及び径方向の移動が規制される。又、本実施の形態のハウジング３と環状に配列された複数の分割コア部１３は、焼きばめにて固定されている。即ち、ハウジング３を加熱して膨張させることで内径を広げ、その内部に環状に配列された複数の分割コア部１３を嵌め込み、常温に戻しハウジング３を収縮させることで、それらを固定している。これにより、環状に配列された複数の分割コア部１３の外周（環状部８の外周面）は、ハウジング３の内周面と押圧接触（強く圧着）することになる。これにより、ハウジング３に固定されたステータ１が形成される。   As shown in FIG. 1, the plurality of split core portions 13 around which the windings 5 are wound are fitted into the housing 3 in an annularly arranged state (closed state), so that their relative movement is performed. Is regulated. That is, the outer periphery of the plurality of divided core portions 13 arranged in an annular shape (the outer periphery of the annular portion 8) is brought into contact with the inner peripheral surface of the housing 3, and the arc convex portions 11f and 12f, the arc concave portions 11g and 12g, and When the circumferential contact surfaces 12h are engaged (contacted) with each other, the rotation and radial movement of the plurality of divided core portions 13 are restricted. Further, the housing 3 of the present embodiment and the plurality of divided core portions 13 arranged in an annular shape are fixed by shrink fitting. That is, the housing 3 is heated and expanded to widen the inner diameter, a plurality of divided core portions 13 arranged in an annular shape are fitted therein, the temperature is returned to room temperature, and the housing 3 is contracted to fix them. . Thereby, the outer periphery (the outer peripheral surface of the annular portion 8) of the plurality of divided core portions 13 arranged in an annular shape is in press contact (strongly pressed) with the inner peripheral surface of the housing 3. Thereby, the stator 1 fixed to the housing 3 is formed.

次に、上記実施の形態の特徴的な作用効果を以下に記載する。
（１）複数の分割コア部１３が配列された状態で隣り合う分割コア部１３の円弧凸部１１ｆ，１２ｆ同士が軸方向に重なり合うため、隣り合う分割環状部１３ａ間の磁気抵抗が小さくなり磁気回路が良好となる。又、分割コア部１３同士が軸方向にズレることが防止される。 Next, characteristic effects of the above embodiment will be described below.
(1) Since the arc-shaped convex portions 11f and 12f of the adjacent divided core portions 13 are overlapped in the axial direction in a state where the plurality of divided core portions 13 are arranged, the magnetic resistance between the adjacent divided annular portions 13a is reduced and magnetism is reduced. The circuit is good. Further, the split core portions 13 are prevented from being displaced in the axial direction.

しかも、第１及び第２積層部材１１，１２における円弧凸部１１ｆ，１２ｆ及び円弧凹部１１ｇ，１２ｇの円弧凸状又は円弧凹状により、複数の分割コア部１３が配列された状態で隣り合う分割コア部１３の回動が（回動案内面に案内されて）許容される。よって、隣り合う分割コア部１３を回動させ、隣り合うティース部７の先端部同士の間隔を広げた状態とすることができる。その結果、前記間隔を広げた状態で巻線５を巻装することで、隣り合うティース部７が邪魔になることなく、巻線５を容易に巻装することができる。しかも、巻線５が巻装された分割コア部１３を回動させるだけで容易に環状とすることができる。   Moreover, the divided cores adjacent to each other in the state where the plurality of divided core portions 13 are arranged by the arc convex shape or the arc concave shape of the arc convex portions 11f, 12f and the arc concave portions 11g, 12g in the first and second laminated members 11, 12. The rotation of the portion 13 is allowed (guided by the rotation guide surface). Therefore, the adjacent division | segmentation core part 13 can be rotated and it can be set as the state which expanded the space | interval of the front-end | tip parts of the adjacent teeth part 7. FIG. As a result, by winding the winding 5 in a state where the interval is widened, the winding 5 can be easily wound without the adjacent teeth portion 7 being in the way. In addition, it is possible to easily make the ring shape by simply rotating the divided core portion 13 around which the winding 5 is wound.

しかも、複数の分割コア部１３が環状に配列された状態でハウジング３に内嵌されることで、それらの相対移動（前記回動及び径方向の移動）が規制されるため、特に前記相対移動を規制するための手段、例えば従来技術のようなピンや、分割環状部１３ａの端部同士の溶接等が不要となる。   In addition, since the plurality of divided core portions 13 are fitted into the housing 3 in a state of being annularly arranged, their relative movement (the rotation and movement in the radial direction) is restricted, and thus the relative movement is particularly preferable. For example, a pin as in the prior art, welding of the end portions of the divided annular portion 13a, or the like becomes unnecessary.

又、円弧凸部１１ｆ，１２ｆ及び円弧凹部１１ｇ，１２ｇの円弧凸状又は円弧凹状により、径方向外側あるいは多少径方向からズレた方向から外力が加わっても、円弧状の曲面（回動案内面）で外力を受け止めることができ、応力集中の防止、ひいてはステータコア６の変形が抑制される。   Further, due to the arc convex shape or the arc concave shape of the arc convex portions 11f and 12f and the arc concave portions 11g and 12g, even if an external force is applied from the radially outer side or the direction slightly deviated from the radial direction, ), The external force can be received, the stress concentration is prevented, and the deformation of the stator core 6 is suppressed.

これらのことから、特性の優れたブラシレスモータ（パワーステアリング装置用モータ）を低コストで製造することができる。
（２）パワーステアリング装置用モータは、路面近傍に配置され、飛石の衝撃等が加わる虞がある。そして、ハウジングにマグネットが固着された直流型のモータ等ではマグネットが衝撃に弱いことからハウジングを剛性の高い鉄材等にて形成する必要があるが、その必要がなくハウジング３を軽量な材料（本実施の形態ではアルミ系金属）で且つ板厚を薄くすることができる。よって、従来の直流型のモータ等に比べてパワーステアリング装置用モータの軽量化を図りながら、（マグネットが破損しないため）その信頼性を向上することができる。 For these reasons, a brushless motor (power steering device motor) having excellent characteristics can be manufactured at low cost.
(2) The motor for the power steering device is disposed near the road surface, and there is a risk that a stepping stone impact or the like may be applied. And in a DC type motor with a magnet fixed to the housing, the magnet is vulnerable to shock, so it is necessary to form the housing from a highly rigid iron or the like. In the embodiment, it is an aluminum-based metal) and the plate thickness can be reduced. Therefore, the reliability of the power steering apparatus motor can be improved while reducing the weight of the motor for the power steering apparatus as compared with a conventional DC motor or the like (because the magnet is not damaged).

（３）円弧凸部１１ｆ，１２ｆ及び円弧凹部１１ｇ，１２ｇにおける円弧凸状及び円弧凹状の円弧は、その円弧を含む円周上において環状部８の径方向における最も内側の点（径方向最内点）を含む。よって、円弧凸部１１ｆ，１２ｆ側はハウジング３の内周と円弧凹部１１ｇ，１２ｇの前記径方向最内点との間で径方向の移動が規制される。これにより、隣り合う分割コア部１３における円弧凹部１１ｇ，１２ｇと円弧凸部１１ｆ，１２ｆとが径方向にずれ難くなり（製造精度が低くても径方向のずれ量が最小となり）、環状部８の真円度を高くすることができる。   (3) The arc convex shape and the arc concave arc in the arc convex portions 11f and 12f and the arc concave portions 11g and 12g are the innermost points in the radial direction of the annular portion 8 on the circumference including the arc (the radially innermost point). Point). Therefore, the movement in the radial direction between the inner circumference of the housing 3 and the radially innermost point of the arc concave portions 11g, 12g is restricted on the arc convex portions 11f, 12f side. This makes it difficult for the arc concave portions 11g, 12g and the arc convex portions 11f, 12f in the adjacent divided core portions 13 to be displaced in the radial direction (the radial displacement is minimized even when the manufacturing accuracy is low). The roundness of can be increased.

（４）積層前分割環状部１１ａ，１２ａの周方向端部における円弧凸部１１ｆ，１２ｆ及び円弧凹部１１ｇ，１２ｇより環状部８の径方向内側には、隣り合う分割コア部１３の回動の（閉時の）終端位置で当接する終端当接面としての周方向当接面１１ｈ，１２ｈが形成される。よって、前記終端位置で周方向当接面１１ｈ，１２ｈが面接触することになる。よって、隣り合うティース部７の先端部同士の間隔を狭くする閉時に終端位置で当接する部分が破損するといったことが防止される。しかも、複数の分割コア部１３が環状に配列されハウジング３に内嵌されることで径方向外側から外力を受けても、周方向当接面１１ｈ，１２ｈが面接触するため、周方向当接面１１ｈ，１２ｈで強固に支持されることになり、環状部８の真円度が低下し難くなる。   (4) The rotation of the adjacent divided core portions 13 on the radially inner side of the annular portion 8 from the circular arc convex portions 11f and 12f and the circular arc concave portions 11g and 12g at the circumferential ends of the divided annular portions 11a and 12a before lamination. Circumferential contact surfaces 11h and 12h are formed as end contact surfaces that contact at the end position (when closed). Therefore, the circumferential contact surfaces 11h and 12h come into surface contact at the terminal position. Therefore, it is possible to prevent a portion that contacts at the terminal position from being damaged when the gap between the tips of the adjacent teeth portions 7 is narrowed. In addition, the circumferential contact surfaces 11h and 12h are in surface contact with each other even when receiving an external force from the radially outer side by arranging the plurality of divided core portions 13 in an annular shape and being fitted in the housing 3, so that the circumferential contact It will be firmly supported by the surfaces 11h and 12h, and the roundness of the annular portion 8 will be difficult to decrease.

（５）前記閉時に終端位置で当接する終端当接面を、環状部８の径方向に延び（即ち放射状に形成され）前記終端位置で周方向に当接する周方向当接面１１ｈ，１２ｈとした。よって、複数の分割コア部１３が環状に配列された状態でハウジング３に内嵌されることで径方向外側から外力を受けても、周方向当接面１１ｈ，１２ｈで周方向に強固に支持されることになり、環状部８の真円度が更に低下し難くなる。   (5) Circumferential contact surfaces 11h, 12h extending in the radial direction of the annular portion 8 (that is, formed in a radial manner) and contacting in the circumferential direction at the end position; did. Therefore, even if an external force is applied from the outside in the radial direction by being internally fitted in the housing 3 in a state where the plurality of divided core portions 13 are arranged in a ring shape, the circumferential contact surfaces 11h and 12h are firmly supported in the circumferential direction. As a result, the roundness of the annular portion 8 is further unlikely to decrease.

（６）円弧凸部１１ｆ，１２ｆ及び円弧凹部１１ｇ，１２ｇにおける円弧凸状及び円弧凹状の円弧の中心は、軸方向から見て周方向当接面１１ｈ，１２ｈの延長線上に設定される。このようにすると、第１及び第２積層部材１１，１２における積層前分割環状部１１ａ，１２ａの周方向端部を鋭角な部分（特に強度の弱くなる部分）のない形状とすることができる。よって、積層前分割環状部１１ａ，１２ａの周方向端部が変形してしまうといったことが低減される。   (6) The centers of the circular arcs of the circular arc convex shape and the circular arc concave shape in the circular arc convex portions 11f and 12f and the circular arc concave portions 11g and 12g are set on the extended lines of the circumferential contact surfaces 11h and 12h when viewed from the axial direction. If it does in this way, the circumferential direction edge part of the cyclic | annular division | segmentation annular parts 11a and 12a before lamination | stacking in the 1st and 2nd lamination | stacking members 11 and 12 can be made into a shape without an acute angle part (part in which intensity | strength becomes weak especially). Therefore, it is possible to reduce the deformation of the end portions in the circumferential direction of the divided annular portions 11a and 12a before lamination.

（７）ハウジング３と環状に配列された複数の分割コア部１３は、焼きばめにて固定されるため、環状に配列された複数の分割コア部１３が径方向外側から大きな外力（図１２中、破線矢印参照）を受けそれらの連結が強固になる（前記相対移動がより確実に規制される）。   (7) Since the plurality of divided core portions 13 arranged in a ring with the housing 3 are fixed by shrink fitting, the plurality of divided core portions 13 arranged in a ring form a large external force from the outside in the radial direction (FIG. 12). (Refer to the broken arrows), the connection between them becomes stronger (the relative movement is more reliably regulated).

（８）ハウジング３は、ステータコア６より線膨張率が大きい材料よりなるため、焼きばめを容易に行うことができる。
（９）隣り合う分割コア部１３は、（円弧凸部１１ｆ，１２ｆ同士が軸方向に重なり合った状態のまま）第１及び第２インシュレータ部材２１，２２（インシュレータ４）にて回動可能に連結される。よって、隣り合う分割コア部１３を回動させる際の取り扱いが容易となる。 (8) Since the housing 3 is made of a material having a larger linear expansion coefficient than the stator core 6, it is possible to easily perform shrink fitting.
(9) The adjacent divided core portions 13 are connected so as to be rotatable by the first and second insulator members 21 and 22 (insulator 4) (while the circular arc convex portions 11f and 12f are overlapped in the axial direction). Is done. Therefore, the handling at the time of rotating the adjacent split core part 13 becomes easy.

上記実施の形態は、以下のように変更して実施してもよい。
・上記実施の形態では、円弧凸部１１ｆ，１２ｆ及び円弧凹部１１ｇ，１２ｇにおける円弧凸状及び円弧凹状の円弧が、その円弧を含む円周上において環状部８の径方向最内点を含むとしたが、ハウジング３に内嵌されることで前記相対移動が規制されれば、前記円弧が径方向最内点を含まないように変更してもよい。 The above embodiment may be modified as follows.
-In said embodiment, when the circular arc convex shape and circular arc concave circular arc in circular arc convex part 11f, 12f and circular arc recessed part 11g, 12g contain the radial direction innermost point of the annular part 8 on the circumference containing the circular arc. However, if the relative movement is restricted by being fitted in the housing 3, the arc may be changed so as not to include the radially innermost point.

例えば、図１３に示すように、変更してもよい。図１３に示すステータコア３１（ティース部３１ａ、環状部３１ｂ）は、複数の分割コア部３２から構成され、各分割コア部３２は、積層部材としての第１積層部材４１と第２積層部材４２とが交互に積層されて形成される。第１及び第２積層部材４１，４２は、弧状に延びる積層前分割環状部４１ａ，４２ａと、積層前分割環状部４１ａ，４２ａの中間部から略直交方向（前記弧状の軸中心方向）に延びる積層前ティース部４１ｂ，４２ｂとを有する。尚、図１３では、既に上記実施の形態と同様に組み付けられた第１及び第２積層部材４１，４２を示し、第２積層部材４２（積層前分割環状部４２ａ、積層前ティース部４２ｂ）が第１積層部材４１に覆われた（第１積層部材４１の下方に位置する）状態を図示している。   For example, it may be changed as shown in FIG. The stator core 31 (the teeth portion 31a and the annular portion 31b) shown in FIG. 13 includes a plurality of divided core portions 32, and each divided core portion 32 includes a first laminated member 41 and a second laminated member 42 as laminated members. Are alternately stacked. The first and second laminated members 41, 42 extend in a substantially orthogonal direction (the arc-shaped axial center direction) from the pre-stacked divided annular portions 41 a, 42 a extending in an arc shape and the intermediate portion of the pre-stacked divided annular portions 41 a, 42 a. It has teeth part 41b, 42b before lamination. FIG. 13 shows the first and second laminated members 41 and 42 that have already been assembled in the same manner as in the above embodiment, and the second laminated member 42 (the divided annular portion 42a before lamination and the tooth portion 42b before lamination). A state of being covered with the first laminated member 41 (located below the first laminated member 41) is illustrated.

第１積層部材４１において積層前分割環状部４１ａの周方向一端４１ｃ（図１３中、左側端）は周方向他端４１ｄ（図１３中、右側端）より積層前ティース部４１ｂ（ティース部３１ａ）からの長さ（周方向長さ）が長く形成されている。そして、積層前分割環状部４１ａの周方向一端４１ｃの径方向外側には軸方向から見て周方向に半円未満で突出する円弧凸状の円弧凸部４１ｅが形成され、同周方向他端４１ｄの径方向外側には周方向に円弧凹状の円弧凹部４１ｆが形成されている。   In the first laminated member 41, a circumferential end 41c (left end in FIG. 13) of the pre-lamination divided annular portion 41a is a pre-lamination tooth portion 41b (tooth portion 31a) from a circumferential other end 41d (right end in FIG. 13). Is formed long (circumferential length). And the circular arc convex part 41e which protrudes in less than a semicircle in the circumferential direction seeing from an axial direction is formed in the radial direction outer side of the circumferential direction one end 41c of the division | segmentation annular | circularion part 41a before lamination | stacking, and the other circumferential direction other end is formed. An arc recess 41f having an arc recess shape in the circumferential direction is formed on the outer side in the radial direction of 41d.

第２積層部材４２において積層前分割環状部４２ａの周方向一端４２ｃ（図１３中、左側端）は周方向他端４２ｄ（図１３中、右側端）より積層前ティース部４２ｂ（ティース部３１ａ）からの長さ（周方向長さ）が短く形成されている。そして、積層前分割環状部４２ａの周方向他端４２ｄの径方向外側には軸方向から見て周方向に半円未満で突出する円弧凸状の円弧凸部４２ｅが形成され、同周方向一端４２ｃの径方向外側には周方向に円弧凹状の円弧凹部４２ｆが形成されている。   In the second laminated member 42, one end 42c in the circumferential direction (left end in FIG. 13) of the pre-lamination divided annular portion 42a is a pre-lamination tooth portion 42b (tooth portion 31a) from the other circumferential end 42d (right end in FIG. 13). The length (circumferential direction length) from is formed short. An arc-convex arc convex portion 42e that protrudes less than a semicircle in the circumferential direction when viewed from the axial direction is formed on the radially outer side of the other circumferential end 42d of the pre-stacked annular portion 42a. A circular arc recess 42f is formed in the circumferential direction on the outer side in the radial direction of 42c.

上記第１及び第２積層部材４１，４２よりなる複数の分割コア部３２は配列された状態で円弧凸部４１ｅ，４２ｅが隣り合う分割コア部３２の円弧凹部４１ｆ，４２ｆに嵌められて、円弧凸部４１ｅ，４２ｅ及び円弧凹部４１ｆ，４２ｆの周方向端面が隣り合う分割コア部３２の回動を案内する回動案内面を構成する。尚、この状態では、勿論、円弧凸部４１ｅ，４２ｅ及び円弧凹部４１ｆ，４２ｆの円弧が同一の円周上に配置されることになる。又、第１及び第２積層部材４１，４２における円弧凸部４１ｅ，４２ｅ及び円弧凹部４１ｆ，４２ｆより径方向内側の周方向端面（周方向一端４１ｃ，４２ｃ、周方向他端４１ｄ，４２ｄ）が隣り合う分割コア部３２の回動の終端位置で当接する周方向当接面（終端当接面）を構成する。   The plurality of divided core portions 32 composed of the first and second laminated members 41 and 42 are arranged in a state in which the arc convex portions 41e and 42e are fitted into the arc concave portions 41f and 42f of the adjacent divided core portion 32 to form an arc. The circumferential end surfaces of the convex portions 41e and 42e and the circular arc concave portions 41f and 42f constitute a rotation guide surface that guides the rotation of the adjacent divided core portions 32. In this state, of course, the arcs of the arc convex portions 41e and 42e and the arc concave portions 41f and 42f are arranged on the same circumference. Further, the circumferential end faces (circumferential one end 41c, 42c, circumferential other end 41d, 42d) radially inward from the arc convex portions 41e, 42e and the arc concave portions 41f, 42f in the first and second laminated members 41, 42 are provided. A circumferential contact surface (terminal contact surface) that contacts at the end position of rotation of the adjacent divided core portions 32 is configured.

そして、上記実施の形態と同様に、巻線が巻装された複数の分割コア部３２は、環状に配列された状態（閉状態）でハウジングに内嵌されることで、それらの相対移動が規制される。   As in the above embodiment, the plurality of split core portions 32 wound with the windings are fitted into the housing in an annularly arranged state (closed state), so that their relative movement is prevented. Be regulated.

このようにしても、上記実施の形態の効果（１）、（２）、（４）、（５）、（７）〜（９）と同様の効果を得ることができる。
又、第１積層部材４１において積層前分割環状部４１ａの周方向一端４１ｃは周方向他端４１ｄより積層前ティース部４１ｂからの長さが長く形成され、第２積層部材４２において積層前分割環状部４２ａの周方向一端４２ｃは周方向他端４２ｄより積層前ティース部４２ｂからの長さが短く形成される。よって、積層前分割環状部４１ａの周方向一端４１ｃにおける円弧凸部４１ｅが形成されない径方向内側の部分と、積層前分割環状部４２ａの周方向他端４２ｄにおける円弧凸部４２ｅが形成されない径方向内側の部分とにおいても軸方向に重なり合うため、隣り合う分割環状部３２ａ間の磁気抵抗が更に小さくなり磁気回路が更に良好となる。又、分割コア部３２同士が軸方向にズレることが更に防止される。 Even if it does in this way, the effect similar to the effect (1) of the said embodiment, (2), (4), (5), (7)-(9) can be acquired.
Further, in the first laminated member 41, the circumferential one end 41c of the pre-lamination divided annular portion 41a is formed to be longer than the pre-lamination tooth portion 41b than the circumferential other end 41d. One end 42c in the circumferential direction of the portion 42a is formed to have a shorter length from the pre-stacking tooth portion 42b than the other end 42d in the circumferential direction. Therefore, the radially inner portion where the arc-shaped convex portion 41e is not formed at the circumferential one end 41c of the pre-stacking annular portion 41a and the radial direction where the arc-shaped convex portion 42e is not formed at the other circumferential end 42d of the pre-stacking annular portion 42a. Since the inner portion also overlaps in the axial direction, the magnetic resistance between the adjacent divided annular portions 32a is further reduced, and the magnetic circuit is further improved. Further, the split core portions 32 are further prevented from being displaced in the axial direction.

さらに、円弧凸部４１ｅ，４２ｅは周方向に半円未満で突出し、円弧凸部４１ｅ，４２ｅの周方向の出っ張りが少ないため、各分割コア部３２において軸方向に並設されることになる円弧凸部４１ｅ，４２ｅの軸方向の間隔（その隙間）の寸法精度が高くなる（円弧凸部の周方向の出っ張りが多いとその先端部が軸方向に変位し易いが、その変位がし難くなる）。よって、例えば、上記実施の形態のように、分割コア部３２同士を軸直交方向（分割環状部３２ａの長手方向）に移動させてそれらの円弧凸部４１ｅ，４２ｅ同士を重ね合う際（円弧凹部４１ｆ，４２ｆに円弧凸部４１ｅ，４２ｅを嵌める際）の組み付けが容易となる。   Furthermore, the arc convex portions 41e and 42e project in less than a semicircle in the circumferential direction, and the arc convex portions 41e and 42e have few protrusions in the circumferential direction. The dimensional accuracy of the axial distance (the gap) between the convex portions 41e and 42e becomes higher (the more the protrusion in the circumferential direction of the arc convex portion, the easier the tip portion to be displaced in the axial direction, but the displacement becomes difficult. ). Therefore, for example, as in the above embodiment, when the divided core portions 32 are moved in the direction perpendicular to the axis (longitudinal direction of the divided annular portion 32a) and the arc convex portions 41e and 42e are overlapped with each other (the arc concave portion 41f). , 42f when the arcuate convex portions 41e, 42e are fitted).

・上記実施の形態では、前記閉時に終端位置で当接する終端当接面を、環状部８の径方向に延び（即ち放射状に形成され）前記終端位置で周方向に当接する周方向当接面１１ｈ，１２ｈとしたが、終端位置で面接触する他の形状（例えば、環状部８の径方向に対して傾斜した面等）に変更してもよい。このようにしても、上記実施の形態の効果（１）〜（４）、（７）〜（９）と同様の効果を得ることができる。   In the above embodiment, the end abutment surface that abuts at the end position at the closing time extends in the radial direction of the annular portion 8 (that is, is formed radially), and the circumferential abutment surface abuts in the circumferential direction at the end position. Although it is set as 11h, 12h, it may be changed to another shape (for example, a surface inclined with respect to the radial direction of the annular portion 8) in surface contact at the terminal position. Even if it does in this way, the effect similar to the effect (1)-(4) of the said embodiment and (7)-(9) can be acquired.

・上記実施の形態では、円弧凸部１１ｆ，１２ｆ及び円弧凹部１１ｇ，１２ｇにおける円弧凸状及び円弧凹状の円弧の中心は、軸方向から見て周方向当接面１１ｈ，１２ｈの延長線上に設定されるとしたが、該延長線上からズレた位置に設定してもよい。このようにしても、上記実施の形態の効果（１）〜（５）、（７）〜（９）と同様の効果を得ることができる。   In the above embodiment, the centers of the arc convex and arc concave arcs in the arc convex portions 11f and 12f and the arc concave portions 11g and 12g are set on the extension lines of the circumferential contact surfaces 11h and 12h when viewed from the axial direction. However, it may be set at a position shifted from the extension line. Even if it does in this way, the effect similar to the effect (1)-(5) of the said embodiment and (7)-(9) can be acquired.

・上記実施の形態では、ハウジング３と環状に配列された複数の分割コア部１３とを、焼きばめにて固定したが、他の方法（例えば、圧入等）にて固定してもよい。
・上記実施の形態では、ハウジング３をステータコア６より線膨張率が大きい材料よりなるとしたが、これに限定されず、例えば線膨張率が略同じ材料に変更してもよい。 In the above embodiment, the housing 3 and the plurality of divided core portions 13 arranged in an annular shape are fixed by shrink fitting, but may be fixed by other methods (for example, press-fitting or the like).
In the above embodiment, the housing 3 is made of a material having a higher linear expansion coefficient than that of the stator core 6. However, the present invention is not limited to this, and may be changed to a material having substantially the same linear expansion coefficient, for example.

・上記実施の形態では、第１及び第２積層部材１１，１２（４１，４２）を交互に積層して分割コア部１３を構成したが、交互でなくとも第１及び第２積層部材１１，１２（４１，４２）を任意複数枚置いて（同一部材を連続して積層させる部分を含めて）積層してもよいし、円弧凸部及び円弧凹部が形成された１つ（１種類であって、例えば第１積層部材１１のみ）の積層部材を積層して分割コア部を構成してもよい。尚、後者の場合、隣り合う分割コア部の円弧凸部同士が軸方向に重なり合わないが、径方向外側あるいは多少径方向からズレた方向から外力が加わっても、円弧凸部及び円弧凹部の円弧状の曲面（回動案内面）で外力を受け止めることができ、応力集中の防止ひいてはステータコアの変形が抑制される等の効果を有する。   In the above embodiment, the divided core portion 13 is configured by alternately laminating the first and second laminated members 11, 12 (41, 42), but the first and second laminated members 11, 12 (41, 42) may be placed in any number (including the part where the same member is continuously laminated), or one (one type of arc convex and concave portions) may be formed. For example, only the first laminated member 11) may be laminated to constitute the divided core portion. In the latter case, the arc convex portions of the adjacent split core portions do not overlap in the axial direction, but even if an external force is applied from the outside in the radial direction or the direction slightly deviated from the radial direction, An external force can be received by an arcuate curved surface (rotation guide surface), and effects such as prevention of stress concentration and, in turn, deformation of the stator core are suppressed.

・上記実施の形態の隣り合う分割コア部１３（３２）における分割環状部１３ａ（３２ａ）の端部同士を溶接し、その後ハウジング３に内嵌させてもよい。このようにすると、ステータコア６（３１）の変形が更に抑制され、剛性が一層増したブラシレスモータを得ることができる。   -The edge part of the division | segmentation annular part 13a (32a) in the adjacent division | segmentation core part 13 (32) of the said embodiment may be welded, and you may make it fit in the housing 3 after that. By doing so, it is possible to obtain a brushless motor in which the deformation of the stator core 6 (31) is further suppressed and the rigidity is further increased.

・上記実施の形態では、第１及び第２インシュレータ部材２１，２２（インシュレータ４）は、隣り合う分割コア部１３（３２）を回動可能に連結するとしたが、前記回動を許容することができれば、連結しないインシュレータ（例えば、分割コア部１３にそれぞれ固定されるインシュレータ部材）に変更してもよい。   In the above embodiment, the first and second insulator members 21 and 22 (insulator 4) connect the adjacent divided core portions 13 (32) so as to be rotatable. However, the rotation may be permitted. If possible, you may change to the insulator which is not connected (for example, the insulator member each fixed to the division | segmentation core part 13).

・上記実施の形態では、車両操舵軸の作動をアシストするためのパワーステアリング装置用モータに具体化したが、他の用途のブラシレスモータに具体化してもよい。
上記各実施の形態から把握できる技術的思想について、以下にその効果とともに記載する。 In the embodiment described above, the power steering device motor for assisting the operation of the vehicle steering shaft is embodied. However, the motor may be embodied in a brushless motor for other purposes.
The technical idea that can be grasped from the above embodiments will be described below together with the effects thereof.

（イ）請求項６又は７に記載のブラシレスモータにおいて、前記終端当接面は、前記環状部の径方向に延び周方向に当接する周方向当接面であることを特徴とするブラシレスモータ。このようにすると、複数の分割コア部が環状に配列されハウジングに内嵌されることで径方向外側から外力を受けても、周方向当接面が面接触するため、周方向当接面で周方向に強固に支持されることになり、環状部の真円度が更に低下し難くなる。   (B) The brushless motor according to claim 6 or 7, wherein the terminal contact surface is a circumferential contact surface extending in a radial direction of the annular portion and contacting in a circumferential direction. In this way, since the plurality of split core portions are arranged in an annular shape and are internally fitted in the housing, the circumferential contact surface comes into surface contact even when receiving an external force from the outside in the radial direction. It will be firmly supported in the circumferential direction, and the roundness of the annular portion will not be further lowered.

（ロ）上記（イ）に記載のブラシレスモータにおいて、前記円弧凸状及び前記円弧凹状の円弧の中心は、軸方向から見て前記周方向当接面の延長線上にあることを特徴とするブラシレスモータ。このようにすると、積層部材又は第１及び第２積層部材の分割環状部と対応した周方向端部を鋭角な部分（特に強度の弱くなる部分）のない形状としながら、請求項３に記載の発明の効果を得ることができる。   (B) In the brushless motor described in (a) above, the center of the arc-shaped convex shape and the circular arc-shaped concave shape is on the extension line of the circumferential contact surface when viewed from the axial direction. motor. In this case, the circumferential end corresponding to the laminated member or the divided annular portions of the first and second laminated members has a shape without an acute angle portion (particularly a portion where the strength is weakened), and according to claim 3. The effects of the invention can be obtained.

本実施の形態におけるブラシレスモータの要部断面図。FIG. 3 is a cross-sectional view of a main part of the brushless motor in the present embodiment. （ａ）本実施の形態における第１積層部材の平面図。（ｂ）（ａ）のＡ−Ａ断面図。(A) The top view of the 1st laminated member in this Embodiment. (B) AA sectional drawing of (a). （ａ）本実施の形態における第２積層部材の平面図。（ｂ）（ａ）のＢ−Ｂ断面図。(A) The top view of the 2nd lamination member in this embodiment. (B) BB sectional drawing of (a). （ａ）本実施の形態におけるステータコアを展開した場合の平面図。（ｂ）同じく正面図。（ｃ）同じく斜視図。(A) The top view at the time of developing the stator core in this Embodiment. (B) Similarly front view. (C) Similarly perspective view. 本実施の形態における第１インシュレータ部材の斜視図。The perspective view of the 1st insulator member in this Embodiment. 本実施の形態における第１インシュレータ部材の平面図。The top view of the 1st insulator member in this Embodiment. 本実施の形態における第２インシュレータ部材の斜視図。The perspective view of the 2nd insulator member in this Embodiment. 本実施の形態における第２インシュレータ部材の平面図。The top view of the 2nd insulator member in this Embodiment. 第１及び第２インシュレータ部材を説明するための説明図。Explanatory drawing for demonstrating a 1st and 2nd insulator member. 図１０のＣ−Ｃ断面図。CC sectional drawing of FIG. 第１及び第２インシュレータ部材を説明するための説明図。Explanatory drawing for demonstrating a 1st and 2nd insulator member. 本実施の形態におけるステータコアの平面図。The top view of the stator core in this Embodiment. 別例におけるステータコアの一部拡大平面図。The partially expanded plan view of the stator core in another example.

符号の説明Explanation of symbols

１…ステータ、２…ロータ、３…ハウジング、６，３１…ステータコア（コア）、７，３１ａ…ティース部、８，３１ｂ…環状部、１１，１２，４１，４２…第１及び第２積層部材、１１ｆ，１２ｆ，４１ｅ，４２ｅ…円弧凸部、１１ｇ，１２ｇ，４１ｆ，４２ｆ…円弧凹部、１２ｈ…周方向当接面（終端当接面）、１３，３２…分割コア部、１３ａ，３２ａ…分割環状部。   DESCRIPTION OF SYMBOLS 1 ... Stator, 2 ... Rotor, 3 ... Housing, 6, 31 ... Stator core (core), 7, 31a ... Teeth part, 8, 31b ... Annular part, 11, 12, 41, 42 ... 1st and 2nd laminated member , 11f, 12f, 41e, 42e ... arc convex portion, 11g, 12g, 41f, 42f ... arc concave portion, 12h ... circumferential contact surface (terminal contact surface), 13, 32 ... split core portion, 13a, 32a ... Divided annular part.

Claims (10)

略筒状のハウジング内周に固定されるステータと、前記ステータの内側に収容されるロータとを備えたブラシレスモータにおいて、
前記ステータは、環状部と該環状部に径方向外側端部が連結され放射状に配置されるティース部とを有するコアを備え、
前記コアは、前記環状部を周方向に分割した分割環状部と該分割環状部の略直交方向に延びる前記ティース部とを有する複数の分割コア部から構成され、
前記分割コア部は、積層部材が積層されて形成されるものであって、該積層部材の前記分割環状部と対応した周方向一端には軸方向から見て周方向に円弧凸状の円弧凸部が形成され同周方向他端には周方向に円弧凹状の円弧凹部が形成され、
前記円弧凹部及び前記円弧凸部は、複数の前記分割コア部が配列された状態で隣接する前記分割コア部の前記円弧凹部及び前記円弧凸部と互いに回動案内面を形成するよう設定され、
複数の前記分割コア部が環状に配列され前記環状部の外周面が前記ハウジングに圧着するように内嵌されたことを特徴とするブラシレスモータ。 In a brushless motor comprising a stator fixed to the inner periphery of a substantially cylindrical housing, and a rotor housed inside the stator,
The stator includes a core having an annular portion and a teeth portion that is radially arranged with the radially outer end connected to the annular portion,
The core is composed of a plurality of divided core portions having a divided annular portion obtained by dividing the annular portion in the circumferential direction and the teeth portion extending in a substantially orthogonal direction of the divided annular portion,
The divided core portion is formed by laminating laminated members, and has a circular arc convex in a circumferential direction when viewed from the axial direction at one circumferential end corresponding to the divided annular portion of the laminated member. A circular arc concave portion is formed in the circumferential direction at the other end in the same circumferential direction,
The arc concave portion and the arc convex portion are set so as to form a rotation guide surface with the arc concave portion and the arc convex portion of the adjacent divided core portion in a state where a plurality of the divided core portions are arranged,
A brushless motor characterized in that a plurality of the divided core portions are arranged in an annular shape and are fitted so that an outer peripheral surface of the annular portion is crimped to the housing. 略筒状のハウジングの内周に固定されるステータと、前記ステータの内側に収容されるロータとを備えたブラシレスモータにおいて、
前記ステータは、前記ハウジングの内周に固定される環状部と該環状部に径方向外側端部が連結され放射状に配置されるティース部とを有するコアを備え、
前記コアは、前記環状部を周方向に分割した分割環状部と該分割環状部の略直交方向に延びる前記ティース部とを有する複数の分割コア部から構成され、
前記分割コア部は、第１及び第２積層部材が交互に積層されて形成され、前記第１積層部材の前記分割環状部と対応した周方向一端には軸方向から見て周方向に円弧凸状の円弧凸部が形成され同周方向他端には周方向に円弧凹状の円弧凹部が形成され、前記第２積層部材の前記分割環状部と対応した周方向一端には軸方向から見て周方向に円弧凹状の円弧凹部が形成され同周方向他端には周方向に円弧凸状の円弧凸部が形成され、
複数の前記分割コア部が配列された状態で前記円弧凸部同士が軸方向に重なり合うと共に隣り合う前記分割コア部の回動を許容するように設定され、
複数の前記分割コア部が環状に配列され前記ハウジングに内嵌されることで、それらの相対移動が規制されるようにしたことを特徴とするブラシレスモータ。 In a brushless motor comprising a stator fixed to the inner periphery of a substantially cylindrical housing, and a rotor housed inside the stator,
The stator includes a core having an annular portion that is fixed to the inner periphery of the housing and a teeth portion that is radially arranged with the radially outer end connected to the annular portion,
The core is composed of a plurality of divided core portions having a divided annular portion obtained by dividing the annular portion in the circumferential direction and the teeth portion extending in a substantially orthogonal direction of the divided annular portion,
The divided core portion is formed by alternately laminating first and second laminated members, and has a circular arc convex in the circumferential direction when viewed from the axial direction at one circumferential end corresponding to the divided annular portion of the first laminated member. A circular arc convex portion is formed, an arc concave portion having a circular arc concave shape is formed in the circumferential direction at the other circumferential end, and one end in the circumferential direction corresponding to the divided annular portion of the second laminated member is viewed from the axial direction. An arc concave portion having an arc concave shape in the circumferential direction is formed, and an arc convex portion having an arc convex shape in the circumferential direction is formed at the other circumferential end,
In a state where a plurality of the divided core portions are arranged, the arc convex portions overlap in the axial direction and are set to allow rotation of the adjacent divided core portions,
A brushless motor characterized in that a plurality of the divided core portions are arranged in an annular shape and are fitted into the housing to restrict relative movement thereof. 請求項１又は２に記載のブラシレスモータにおいて、
前記円弧凸部及び前記円弧凹状の円弧は、その円弧を含む円周上において前記環状部の径方向における最も内側の点を含むことを特徴とするブラシレスモータ。 The brushless motor according to claim 1 or 2,
The brushless motor, wherein the arc convex part and the arc concave arc include an innermost point in a radial direction of the annular part on a circumference including the arc. 請求項２に記載のブラシレスモータにおいて、
前記円弧凸部の周方向に突出する円弧は、半円未満からなることを特徴とするブラシレスモータ。 The brushless motor according to claim 2,
The brushless motor according to claim 1, wherein the arc protruding in the circumferential direction of the arc convex portion is formed of less than a semicircle. 環状部と該環状部に径方向外側端部が連結され放射状に配置されるティース部とを有するステータコアは、前記環状部を周方向に分割した分割環状部と該分割環状部の略直交方向に延びる前記ティース部とを有する複数の分割コア部から構成され、
前記分割コア部は、積層部材が積層されて形成されるものであって、該積層部材の前記分割環状部と対応した周方向一端には軸方向から見て周方向に円弧凸状の円弧凸部が形成され同周方向他端には周方向に円弧凹状の円弧凹部が形成され、
前記円弧凹部及び前記円弧凸部は、複数の前記分割コア部が配列された状態で隣接する前記分割コア部の前記円弧凹部及び前記円弧凸部と互いに回動案内面を形成するよう設定され、
前記円弧凸部及び前記円弧凹状の円弧は、その円弧を含む円周上において前記環状部の径方向における最も内側の点を含むことを特徴とするブラシレスモータ。 A stator core having an annular part and a tooth part radially connected to the annular part with a radially outer end connected to the annular part is divided into an annular part obtained by dividing the annular part in the circumferential direction and a direction substantially orthogonal to the divided annular part. It is composed of a plurality of split core parts having the teeth part extending,
The divided core portion is formed by laminating laminated members, and has a circular arc convex in a circumferential direction when viewed from the axial direction at one circumferential end corresponding to the divided annular portion of the laminated member. A circular arc concave portion is formed in the circumferential direction at the other end in the same circumferential direction,
The arc concave portion and the arc convex portion are set so as to form a rotation guide surface with the arc concave portion and the arc convex portion of the adjacent divided core portion in a state where a plurality of the divided core portions are arranged,
The brushless motor, wherein the arc convex part and the arc concave arc include an innermost point in a radial direction of the annular part on a circumference including the arc. 請求項１乃至３のいずれか１項に記載のブラシレスモータにおいて、
前記積層部材又は前記第１及び第２積層部材の前記分割環状部と対応した周方向端部における前記円弧凸部及び前記円弧凹部より前記環状部の径方向内側には、隣り合う前記分割コア部の回動の終端位置で当接する終端当接面が形成されることを特徴とするブラシレスモータ。 The brushless motor according to any one of claims 1 to 3,
The divided core portions adjacent to each other on the radially inner side of the annular portion from the circular arc convex portion and the circular arc concave portion at the circumferential end corresponding to the divided annular portion of the laminated member or the first and second laminated members. A brushless motor, characterized in that a terminal contact surface that contacts at the terminal position of rotation is formed. 略筒状のハウジングの内周に固定されるステータと、前記ステータの内側に収容されるロータとを備えたブラシレスモータにおいて、
前記ステータは、前記ハウジングの内周に固定される環状部と該環状部に径方向外側端部が連結され放射状に配置されるティース部とを有するコアを備え、
前記コアは、前記環状部を周方向に分割した分割環状部と該分割環状部の略直交方向に延びる前記ティース部とを有する複数の分割コア部から構成され、
前記分割コア部は、第１及び第２積層部材が交互に積層されて形成され、
前記第１積層部材の前記分割環状部と対応した周方向一端は周方向他端より前記ティース部からの長さが長く形成され、同周方向一端の径方向外側には軸方向から見て周方向に半円未満で突出する円弧凸状の円弧凸部が形成され同周方向他端の径方向外側には周方向に円弧凹状の円弧凹部が形成され、
前記第２積層部材の前記分割環状部と対応した周方向一端は周方向他端より前記ティース部からの長さが短く形成され、同周方向一端の径方向外側には軸方向から見て周方向に円弧凹状の円弧凹部が形成され同周方向他端の径方向外側には周方向に半円未満で突出する円弧凸状の円弧凸部が形成され、
複数の前記分割コア部が配列された状態で前記円弧凸部が隣り合う前記分割コア部の前記円弧凹部に嵌められて、前記円弧凸部及び前記円弧凹部の周方向端面が隣り合う前記分割コア部の回動を案内する回動案内面を構成し、前記円弧凸部及び前記円弧凹部より径方向内側の周方向端面が隣り合う前記分割コア部の回動の終端位置で当接する終端当接面を構成し、
複数の前記分割コア部が環状に配列され前記ハウジングに内嵌されることで、それらの相対移動が規制されるようにしたことを特徴とするブラシレスモータ。 In a brushless motor comprising a stator fixed to the inner periphery of a substantially cylindrical housing, and a rotor accommodated inside the stator,
The stator includes a core having an annular portion that is fixed to the inner periphery of the housing and a teeth portion that is radially arranged with the radially outer end connected to the annular portion,
The core is composed of a plurality of divided core portions having a divided annular portion obtained by dividing the annular portion in the circumferential direction and the teeth portion extending in a substantially orthogonal direction of the divided annular portion,
The divided core portion is formed by alternately laminating first and second laminated members,
One end in the circumferential direction corresponding to the divided annular portion of the first laminated member is formed to be longer from the teeth portion than the other end in the circumferential direction. An arc convex arc convex portion protruding in less than a semicircle in the direction is formed, and an arc concave portion having an arc concave shape in the circumferential direction is formed on the radially outer side of the other circumferential end,
One end in the circumferential direction corresponding to the divided annular portion of the second laminated member is formed to have a shorter length from the tooth portion than the other end in the circumferential direction. A circular arc concave portion is formed in the direction, and a circular arc convex portion protruding in a circumferential direction with less than a semicircle is formed on the radially outer side at the other end in the circumferential direction.
In the state where a plurality of the divided core portions are arranged, the arc-shaped convex portions are fitted in the arc-shaped concave portions of the adjacent divided core portions, and the circumferential end surfaces of the arc-shaped convex portions and the arc-shaped concave portions are adjacent to each other. Terminal contact that constitutes a rotation guide surface that guides the rotation of the portion, and the circumferential end surface radially inward from the arc convex portion and the arc concave portion abuts at the rotation end position of the adjacent divided core portion Composing the surface,
A brushless motor characterized in that a plurality of the divided core portions are arranged in an annular shape and are fitted into the housing to restrict relative movement thereof. 請求項１、２、３、４、６、７のいずれか１項に記載のブラシレスモータにおいて、
前記ハウジングと環状に配列された複数の前記分割コア部は、焼きばめにて固定されたことを特徴とするブラシレスモータ。 The brushless motor according to any one of claims 1, 2, 3, 4, 6, and 7,
The brushless motor, wherein the plurality of divided core portions arranged in a ring shape with the housing are fixed by shrink fitting. 請求項１、２、３、４、６、７、８のいずれか１項に記載のブラシレスモータにおいて、
前記ハウジングは、前記コアより線膨張率が大きい材料よりなることを特徴とするブラシレスモータ。 The brushless motor according to any one of claims 1, 2, 3, 4, 6, 7, and 8.
The brushless motor is characterized in that the housing is made of a material having a larger linear expansion coefficient than the core. 請求項１乃至９のいずれか１項に記載のブラシレスモータにおける前記ロータは、車両操舵軸の作動をアシストするためのものであるパワーステアリング装置用モータ。   The motor for a power steering apparatus, wherein the rotor in the brushless motor according to any one of claims 1 to 9 is for assisting an operation of a vehicle steering shaft.
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JP2006115685A (en) * 2004-09-17 2006-04-27 Asmo Co Ltd Insulator, stator, and brushless motor
JP2006271091A (en) * 2005-03-23 2006-10-05 Asmo Co Ltd Stator of brushless motor and brushless motor
WO2006117865A1 (en) * 2005-04-28 2006-11-09 Hitachi, Ltd. Motor for electric power steering and electric power steering system using the same
JP2007135356A (en) * 2005-11-11 2007-05-31 Asmo Co Ltd Manufacturing method of stator, and the stator
JP2008131679A (en) * 2006-11-16 2008-06-05 Asmo Co Ltd Manufacturing method of stator, and stator
JP2008312407A (en) * 2007-06-18 2008-12-25 Jtekt Corp Motor and electric power steering arrangement
DE112007001381T5 (en) 2006-06-16 2009-04-16 Toyota Jidosha Kabushiki Kaisha, Toyota-shi Stator and engine
WO2007145471A3 (en) * 2006-06-16 2009-06-11 Lg Electronics Inc Stator of motor and washing apparatus having the same
WO2011076027A1 (en) * 2009-12-24 2011-06-30 中山大洋电机制造有限公司 Motor stator structure
JP2011142811A (en) * 2010-01-08 2011-07-21 Saia Burgess Murten Ag Stator of electric motor
CN102306961A (en) * 2011-09-01 2012-01-04 深圳众为兴技术股份有限公司 Motor
JP2012023961A (en) * 2011-11-02 2012-02-02 Asmo Co Ltd Manufacturing method of stator
JP2012065510A (en) * 2010-09-17 2012-03-29 Aisin Seiki Co Ltd Stator
US20120086300A1 (en) * 2010-10-08 2012-04-12 Lg Innotek Co., Ltd. Divided Core of EPS Motor Stator
JP2016052200A (en) * 2014-09-01 2016-04-11 スズキ株式会社 Rotary electric machine
EP3038234A1 (en) * 2014-12-24 2016-06-29 Toyota Jidosha Kabushiki Kaisha Supporter for stator
US10505408B2 (en) 2016-09-02 2019-12-10 Nidec Corporation Stator, stator manufacturing method and motor
US10727722B2 (en) 2016-09-02 2020-07-28 Nidec Corporation Stator, stator manufacturing method and motor
CN113615038A (en) * 2019-03-20 2021-11-05 吉凯恩粉末冶金工程有限公司 Claw-pole stator for transverse flux machine

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JPH07298522A (en) * 1994-04-27 1995-11-10 Matsushita Electric Ind Co Ltd Stator for motor
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Cited By (26)

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Publication number Priority date Publication date Assignee Title
JP2006115685A (en) * 2004-09-17 2006-04-27 Asmo Co Ltd Insulator, stator, and brushless motor
JP4516463B2 (en) * 2005-03-23 2010-08-04 アスモ株式会社 Brushless motor stator and brushless motor
JP2006271091A (en) * 2005-03-23 2006-10-05 Asmo Co Ltd Stator of brushless motor and brushless motor
WO2006117865A1 (en) * 2005-04-28 2006-11-09 Hitachi, Ltd. Motor for electric power steering and electric power steering system using the same
JP4865704B2 (en) * 2005-04-28 2012-02-01 日立オートモティブシステムズ株式会社 Electric power steering motor for vehicle and electric power steering system for vehicle using the same
JPWO2006117865A1 (en) * 2005-04-28 2008-12-18 株式会社日立製作所 Electric power steering motor and electric power steering system using the same
JP2007135356A (en) * 2005-11-11 2007-05-31 Asmo Co Ltd Manufacturing method of stator, and the stator
DE112007001381T5 (en) 2006-06-16 2009-04-16 Toyota Jidosha Kabushiki Kaisha, Toyota-shi Stator and engine
WO2007145471A3 (en) * 2006-06-16 2009-06-11 Lg Electronics Inc Stator of motor and washing apparatus having the same
US7944111B2 (en) 2006-06-16 2011-05-17 Toyota Jidosha Kabushiki Kaisha Stator and motor
US8833112B2 (en) 2006-06-16 2014-09-16 Lg Electronics Inc. Stator of motor and washing apparatus having the same
JP2008131679A (en) * 2006-11-16 2008-06-05 Asmo Co Ltd Manufacturing method of stator, and stator
JP2008312407A (en) * 2007-06-18 2008-12-25 Jtekt Corp Motor and electric power steering arrangement
WO2011076027A1 (en) * 2009-12-24 2011-06-30 中山大洋电机制造有限公司 Motor stator structure
JP2011142811A (en) * 2010-01-08 2011-07-21 Saia Burgess Murten Ag Stator of electric motor
US8689427B2 (en) 2010-01-08 2014-04-08 Johnson Electric S.A. Stator of an electric motor
JP2012065510A (en) * 2010-09-17 2012-03-29 Aisin Seiki Co Ltd Stator
US20120086300A1 (en) * 2010-10-08 2012-04-12 Lg Innotek Co., Ltd. Divided Core of EPS Motor Stator
KR101135251B1 (en) * 2010-10-08 2012-04-12 엘지이노텍 주식회사 Devided-core of eps motor stator
CN102306961A (en) * 2011-09-01 2012-01-04 深圳众为兴技术股份有限公司 Motor
JP2012023961A (en) * 2011-11-02 2012-02-02 Asmo Co Ltd Manufacturing method of stator
JP2016052200A (en) * 2014-09-01 2016-04-11 スズキ株式会社 Rotary electric machine
EP3038234A1 (en) * 2014-12-24 2016-06-29 Toyota Jidosha Kabushiki Kaisha Supporter for stator
US10505408B2 (en) 2016-09-02 2019-12-10 Nidec Corporation Stator, stator manufacturing method and motor
US10727722B2 (en) 2016-09-02 2020-07-28 Nidec Corporation Stator, stator manufacturing method and motor
CN113615038A (en) * 2019-03-20 2021-11-05 吉凯恩粉末冶金工程有限公司 Claw-pole stator for transverse flux machine

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