JP2006081278A

JP2006081278A - Brushless motor

Info

Publication number: JP2006081278A
Application number: JP2004261400A
Authority: JP
Inventors: Masashi Yamamura; 真史山村; Masahiro Goto; 昌宏後藤
Original assignee: Asmo Co Ltd
Current assignee: Asmo Co Ltd
Priority date: 2004-09-08
Filing date: 2004-09-08
Publication date: 2006-03-23

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brushless motor wherein magnetic saturation is suppressed in the engagement portions of a split core and vibration can be suppressed during driving. <P>SOLUTION: By having laminated members, different in circumferential length of a laminated, split annular portion laminated, clearances 110, 210, 310 and 410 of the engaging portions in the circumferential direction can be dispersed in the circumferential direction from layer to layer. Therefore, the positions, in which magnetic flux (shown by broken line in the selected drawing) moves through the laminated members 101, 201, 301 and 401 adjoining in the axial direction, can be dispersed in the circumferential direction. The concentration of magnetic flux is mitigated by dispersing a flow of magnetism, and this enables magnetic saturation to be less prone to occur. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明はブラシレスモータに関する。 The present invention relates to a brushless motor.

従来、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。ステータコアは、ティース部毎に分割された形状の分割コアが環状に連結されてなる。このようなステータ（ステータコア）では、分割コア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。 2. Description of the Related Art Conventionally, a stator of a brushless motor includes a stator core (core) having an annular portion that is fixed to the inner periphery of a housing and teeth portions that are radially arranged with the radially outer end connected to the annular portion. The stator core is formed by annularly connecting divided cores having a shape divided for each tooth portion. In such a stator (stator core), by winding the winding around the tooth portion before connecting the split cores in an annular shape, the winding can be easily wound without the adjacent teeth portion interfering with each other. Can do.

各分割コアは、例えば特許文献１に開示されているように、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形成されている。図１３は、特許文献１のステータコアの部分拡大図であり、隣接する分割コア５１０，５２０の一部を示す。分割コア５１０と分割コア５２０は、分割コア５１０は交互に積層された第１積層部材５１１と第２積層部材５１２とから構成され、分割コア５２０は交互に積層された第１積層コア５２１と第２積層コア５２２とから構成されている。そして、分割コア５１０，５２０の周方向端部は凹凸を繰り返す形状となっている。ただし、第１積層部材５１１と第１積層部材５２１、および、第２積層部材５１２と第２積層部材５２２は、それぞれ同一の形状である。よって、分割コア５１０，５２０も同一の形状となる。隣り合う分割コア５１０，５２０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貫通された図示しないピンにより連結されている。このようなステータでは、複数の分割コア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）、重なり合う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、分割コア同士の軸方向のずれを抑制することができる。
特開平７−２２２３８３号公報 For example, as disclosed in Patent Document 1, each divided core is formed by alternately stacking first and second laminated members having different circumferential end portions corresponding to the annular portion. FIG. 13 is a partially enlarged view of the stator core of Patent Document 1, and shows a part of adjacent divided cores 510 and 520. The divided core 510 and the divided core 520 include a first laminated member 511 and a second laminated member 512 that are alternately laminated, and the divided core 520 and the first laminated core 521 and the first laminated core 521 that are alternately laminated. 2 laminated cores 522. And the circumferential direction edge part of the division | segmentation cores 510 and 520 becomes a shape which repeats an unevenness | corrugation. However, the first laminated member 511 and the first laminated member 521 and the second laminated member 512 and the second laminated member 522 have the same shape. Therefore, the split cores 510 and 520 have the same shape. Adjacent split cores 510 and 520 are arranged so that the projections and recesses in the circumferential ends are fitted to each other (that is, the projections overlap each other), and pins that are not shown are penetrated in the axial direction by the overlapping projections. It is connected. In such a stator, since the convex portions of the adjacent divided core portions overlap in the axial direction with a plurality of divided cores 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 convex parts overlap in an axial direction, the shift | offset | difference of the axial direction of division | segmentation cores can be suppressed.
JP-A-7-222383

ところで、図１３に示すように、隣接する分割コア５１０，５２０間において、周方向に隣り合う積層部材（第１積層部材５１１，５２１間、第２積層部材５１２，５２２間）の端部間には微少な隙間（クリアランス）が存在する。このため、分割コア５１０の第１積層部材５１１を通過する磁束（図中の点線）は、その端部において軸方向（図において上下方向）に隣接する第２積層部材５１２に移る。つまり分割コア５１０において第１積層部材５１１を通過する磁束は、第２積層部材５１２を通過するようになる。従って、第２積層部材５１２は、部分的に第１積層部材５１１と第２積層部材５１２の磁束が通過することになり、磁束密度が大きくなる。また、分割コア５１０の第２積層部材５１２を通過する磁束は、その第２積層部材５１２の端部において、分割コア５２０の第１積層部材５２１を通過したのち、第１積層部材５２１と第２積層部材５２２とを通過する。 By the way, as shown in FIG. 13, between the adjacent divided cores 510 and 520, between the end portions of the laminated members adjacent to each other in the circumferential direction (between the first laminated members 511 and 521 and between the second laminated members 512 and 522). There is a slight gap (clearance). For this reason, the magnetic flux (dotted line in the figure) passing through the first laminated member 511 of the split core 510 moves to the second laminated member 512 adjacent in the axial direction (vertical direction in the figure) at the end. That is, the magnetic flux passing through the first laminated member 511 in the split core 510 passes through the second laminated member 512. Therefore, the magnetic flux of the first laminated member 511 and the second laminated member 512 partially passes through the second laminated member 512, and the magnetic flux density increases. Further, the magnetic flux passing through the second laminated member 512 of the split core 510 passes through the first laminated member 521 of the divided core 520 at the end of the second laminated member 512, and then the first laminated member 521 and the second laminated member 521. It passes through the laminated member 522.

従って、軸方向に隣接する積層部材の端部が接触する部分に磁気が集中し、磁気飽和となりやすい。また、磁気の分布が周方向で均一でなくなるため、モータ駆動時の振動が生じやすくなる。 Therefore, magnetism concentrates on the portion where the end portions of the laminated members adjacent in the axial direction are in contact, and magnetic saturation is likely to occur. In addition, since the magnetic distribution is not uniform in the circumferential direction, vibration during motor driving tends to occur.

本発明は、こうした実情に鑑みてなされたものであって、その目的は、分割コアの嵌合部において磁気飽和を抑え駆動時の振動を抑制することができるブラシレスモータを提供することにある。 The present invention has been made in view of such circumstances, and an object of the present invention is to provide a brushless motor capable of suppressing magnetic saturation in a fitting portion of a split core and suppressing vibration during driving.

上記課題を解決するために、請求項１に記載の発明は、略筒状の環状部と該環状部の略直交方向に延びるティース部とから構成されるコアを備えるステータと、前記ステータの内周側に収容されるロータとを備えたブラシレスモータであって、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前記ティース部とを備える複数の分割コアから構成され、前記各分割コアは、該周方向端部に、周方向に隣接する前記分割コアと嵌合する凸部及び凹部を備え、前記各分割コアは、前記周方向端部に形成する複数の凸部の長さ、又は、複数の凹部の深さが異なるように複数の積層部材を積層することによって形成される。 In order to solve the above-mentioned problem, the invention according to claim 1 is a stator including a core composed of a substantially cylindrical annular portion and a teeth portion extending in a direction substantially orthogonal to the annular portion; A brushless motor including a rotor accommodated on a peripheral side, wherein the core is composed of a plurality of divided cores including a divided annular portion obtained by dividing the annular portion in a circumferential direction and the teeth portion, The split core includes, at the circumferential end, a convex portion and a concave portion that fit with the circumferentially adjacent split core, and each of the split cores has a length of a plurality of convex portions formed at the circumferential end portion. Alternatively, it is formed by laminating a plurality of laminated members such that the depths of the plurality of recesses are different.

また、請求項２に記載の発明は、請求項１に記載のブラシレスモータにおいて、前記積層部材は、前記周方向端部に、周方向に隣接する前記積層部材と当接する平面状の当接面を備える。 The invention according to claim 2 is the brushless motor according to claim 1, wherein the laminated member has a planar contact surface that comes into contact with the laminated member adjacent in the circumferential direction at the circumferential end. Is provided.

また、請求項３に記載の発明は、請求項１または２に記載のブラシレスモータにおいて、前記積層部材は、前記周方向端部の一端に周方向に円弧凸状に突出した円弧凸部を備えるとともに、隣接する前記積層部材の前記円弧凸部に嵌る円弧凹状の円弧凹部をその他端に備える。 According to a third aspect of the present invention, in the brushless motor according to the first or second aspect, the laminated member includes an arc convex portion protruding in an arc convex shape in the circumferential direction at one end of the circumferential direction end portion. In addition, an arc concave arc recess that fits into the arc convex portion of the adjacent laminated member is provided at the other end.

また、請求項４に記載の発明は、請求項２または３に記載のブラシレスモータにおいて、前記分割コアは、前記積層部材同士の前記円弧凸部および前記円弧凹部を形成する円弧の中心を同軸上に持つ前記積層部材から構成される。 According to a fourth aspect of the present invention, in the brushless motor according to the second or third aspect, the split core is coaxial with a center of an arc that forms the arc convex part and the arc concave part of the laminated members. It is comprised from the said laminated member.

また、請求項５に記載の発明は、請求項４に記載のブラシレスモータにおいて、前記分割コアは、前記積層部材同士の前記円弧凸部および前記円弧凹部を形成する円弧の半径のみが異なる前記積層部材から構成される。 Further, the invention according to claim 5 is the brushless motor according to claim 4, wherein the split core is different in only the radius of the arc that forms the arc convex part and the arc concave part of the laminated members. It consists of members.

また、請求項６に記載の発明は、略筒状の環状部と該環状部の略直交方向に延びるティース部とから構成されるコアを備えるステータと、前記ステータの内周側に収容されるロータとを備えたブラシレスモータであって、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前記ティース部とを備える複数の分割コアから構成され、前記分割コアは、前記周方向端部に、周方向に隣接する前記分割コアと嵌合する円弧凸部及び円弧凹部、ならびに、周方向端部に隣接する前記分割コアと当接する該円弧凸部及び円弧凹部の内径側に続いて形成される当接面、を備えた複数の積層部材を積層することによって形成される。 According to a sixth aspect of the present invention, a stator including a core composed of a substantially cylindrical annular portion and a tooth portion extending in a direction substantially orthogonal to the annular portion is accommodated on the inner peripheral side of the stator. A brushless motor including a rotor, wherein the core is composed of a plurality of divided cores including a divided annular portion obtained by dividing the annular portion in a circumferential direction and the teeth portion, and the divided core is formed in the circumferential direction. Continuing at the end is an arc convex portion and an arc concave portion that fits with the divided core adjacent in the circumferential direction, and an inner diameter side of the arc convex portion and arc concave portion that contacts the divided core adjacent to the circumferential end portion It is formed by laminating a plurality of laminated members provided with contact surfaces formed in this manner.

また、請求項７に記載の発明は、請求項２〜６のいずれか１項に記載のブラシレスモータにおいて、前記円弧凸部及び前記円弧凹部は、半円未満の円弧から形成される。
（作用）
請求項１に記載の発明によれば、各分割コアの周方向嵌合部のクリアランスの位置を各層毎に変更し、周方向の嵌合部のクリアランスの位置を周方向に分散させるようにした。このため、各層において、磁束が他の層に移動する位置が分散されるため、磁束の集中によって磁気飽和し難くすることができる。 According to a seventh aspect of the present invention, in the brushless motor according to any one of the second to sixth aspects, the arc convex portion and the arc concave portion are formed from arcs less than a semicircle.
(Function)
According to the first aspect of the present invention, the position of the clearance of the circumferential fitting portion of each divided core is changed for each layer, and the position of the clearance of the circumferential fitting portion is dispersed in the circumferential direction. . For this reason, in each layer, since the position where a magnetic flux moves to another layer is dispersed, magnetic saturation can be made difficult due to the concentration of the magnetic flux.

請求項２に記載の発明によれば、積層部材の周方向端部に備えられた当接面によって、隣接する分割コア同士の接触を確実にすることが可能となる。よって、周方向の磁気抵抗を低減することが可能となる。 According to the second aspect of the present invention, the contact between the adjacent divided cores can be ensured by the contact surface provided at the circumferential end of the laminated member. Therefore, it is possible to reduce the circumferential magnetic resistance.

請求項３に記載の発明によれば、円弧凹部に円弧凸部を嵌合させることで、隣接する積層部材を径方向に位置決めすることになり、嵌合を容易に行うことができるとともに、径方向の位置ずれを抑制することができる。 According to the invention described in claim 3, by fitting the arc convex portion to the arc concave portion, the adjacent laminated member is positioned in the radial direction, and the fitting can be easily performed and the diameter can be easily adjusted. The positional deviation in the direction can be suppressed.

請求項４に記載の発明によれば、円弧凸部および円弧凹部を形成する円弧の中心を同軸上に持つことによって、その円弧中心を巻線を巻装する際の開閉の回動中心とすることができる。このため、隣接する分割コアを互いに回動させて隣り合うティース部間を広げて巻線の巻装を容易とすることができる。 According to the fourth aspect of the present invention, the center of the arc that forms the arc convex part and the arc concave part is coaxially provided, and the arc center is used as a rotation center for opening and closing when winding the winding. be able to. For this reason, the adjacent division | segmentation cores can be mutually rotated and the space | interval between adjacent teeth parts can be expanded, and winding of a coil | winding can be made easy.

請求項５に記載の発明によれば、円弧中心を一致させたまま、円弧凸部および円弧凹部をもつ積層部材の周方向嵌合部の位置を周方向に適宜設定することが可能となる。よって、円弧中心を回動中心でありながら、周方向の嵌合部のクリアランスの位置が各層ごとに異なる分割コアから形成されるブラシレスモータを得ることができる。 According to the fifth aspect of the present invention, it is possible to appropriately set the position of the circumferential fitting portion of the laminated member having the arc convex portion and the arc concave portion in the circumferential direction while keeping the arc centers coincident. Therefore, it is possible to obtain a brushless motor formed from divided cores in which the clearance position of the fitting portion in the circumferential direction is different for each layer while the arc center is the rotation center.

請求項６に記載の発明によれば、円弧凸部及び円弧凹部により分割コア間の位置決めが容易となるとともに、当接面により分割コア端部の磁気飽和が抑制される。また、当接面により周方向の剛性が向上する。さらに、当接面は円弧凸部及び円弧凹部よりも内径側に続いて形成されているため、分割コアの径方向内側（ロータ側）への移動も規制される。 According to the sixth aspect of the present invention, positioning between the split cores is facilitated by the arc convex portion and the arc concave portion, and magnetic saturation at the end of the split core is suppressed by the contact surface. Further, the rigidity in the circumferential direction is improved by the contact surface. Furthermore, since the contact surface is formed on the inner diameter side with respect to the arc convex portion and the arc concave portion, the movement of the split core to the radially inner side (rotor side) is also restricted.

請求項７に記載の発明によれば、円弧凸部の周方向へ突出する面積を小さくすることができる。よって、隣接する円弧凹部への嵌合が容易となる。また、嵌合後の軸方向の円弧凸部同士の重なる面積を広くすることができる。よって、軸方向の剛性を高めると共に磁気抵抗を低減することが可能となる。また、隣接する分割コアに当接する面である当接面の面積が大きくなり周方向の磁気抵抗も低減することが可能となる。 According to invention of Claim 7, the area which protrudes in the circumferential direction of an arc convex part can be made small. Therefore, it becomes easy to fit into the adjacent arc recess. Further, the overlapping area of the arcuate convex portions in the axial direction after the fitting can be increased. Therefore, it is possible to increase the axial rigidity and reduce the magnetic resistance. In addition, the area of the abutting surface that is a surface that abuts the adjacent split core is increased, and the magnetic resistance in the circumferential direction can be reduced.

本発明によれば、分割コアの嵌合部において磁気飽和を抑え駆動時の振動を抑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。 ADVANTAGE OF THE INVENTION According to this invention, the brushless motor which can suppress the vibration at the time of a drive by suppressing magnetic saturation in the fitting part of a split core can be provided.

以下、本発明を適用したブラシレスモータの一実施例を図１〜８に従って説明する。
図１に示すように、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）を有してステータ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。 Hereinafter, an embodiment of a brushless motor to which the present invention is applied will be described with reference to FIGS.
As shown in FIG. 1, the brushless motor includes a stator 1 and a rotor 2 (shown by an alternate long and short dash line in the figure) that has a magnet (not shown) disposed opposite to the stator 1 and is accommodated inside the stator 1. And a housing 3.

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、ハウジング３に固定される環状部８と、該環状部８から径方向内側に中心に向かって放射状に形成配設され巻線５が巻装される複数のティース部７とを備える。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 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 includes an annular portion 8 that is fixed to the housing 3 and a plurality of teeth portions 7 that are radially formed and disposed radially inward from the annular portion 8 and on which the winding 5 is wound. . In the present embodiment, twelve teeth portions 7 are formed at equiangular (30 degree) intervals.

ステータコア６は、図２（ａ）〜（ｃ）に示すように、周方向に分割された形状で互いの回動が許容されるとともに、それぞれ１つのティース部７を有する複数（本実施形態では１２個）の分割コア９から構成される。各分割コア９は、複数種類の積層部材を積層させることによって形成されている。本実施形態では、積層部材は、第１積層部材１０１と、第２積層部材２０１と、第３積層部材３０１と、第４積層部材４０１とを含む。即ち、本実施形態の分割コア９は、４種類の積層部材によって構成されている。 As shown in FIGS. 2A to 2C, the stator core 6 is allowed to rotate with a shape divided in the circumferential direction, and has a plurality of teeth portions 7 (in this embodiment). 12) divided cores 9. Each divided core 9 is formed by laminating a plurality of types of laminated members. In the present embodiment, the laminated member includes a first laminated member 101, a second laminated member 201, a third laminated member 301, and a fourth laminated member 401. That is, the split core 9 of this embodiment is configured by four types of laminated members.

各積層部材１０１，２０１，３０１，４０１の形状を順次説明する。
図３（ａ）（ｂ）は第１積層部材１０１を示す。第１積層部材１０１は、分割コア９の分割環状部１０を形成する積層分割環状部１０２と、分割コア９のティース部７を形成する積層ティース部１０３とを備える。 The shape of each laminated member 101, 201, 301, 401 will be described sequentially.
3A and 3B show the first laminated member 101. FIG. The first laminated member 101 includes a laminated divided annular portion 102 that forms the divided annular portion 10 of the divided core 9 and a laminated tooth portion 103 that forms the tooth portion 7 of the divided core 9.

積層ティース部１０３には板厚方向（軸方向）の一方に第１嵌合凸部１０４が配設されるとともに、板厚方向の他方に第１嵌合凹部１０５が形成されている。第１嵌合凹部１０５と第１嵌合凸部１０４は、板厚方向に並んで形成されるとともに、その組が積層ティース部１０３の延設方向に２つ並んで形成されている。 The laminated tooth portion 103 is provided with a first fitting convex portion 104 on one side in the plate thickness direction (axial direction) and a first fitting concave portion 105 on the other side in the plate thickness direction. The first fitting concave portion 105 and the first fitting convex portion 104 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 laminated tooth portion 103.

積層分割環状部１０２の一端には、円弧を持ち周方向に突出する円弧凸部１０６が形成されている。円弧凸部１０６は積層分割環状部の外周内に形成されると共に、第１積層部材１０１の板厚方向に対して垂直な面上に形成される。また、積層分割環状部１０２の他端には、円弧を持ち周方向に窪む円弧凹部１０７が形成されている。円弧凹部１０７は、第１積層部材１０１の板厚方向に対して垂直な面上に形成されている。円弧凹部１０７の円弧は９０度の円弧（円の１／４）である。そして、積層分割環状部１０２の周方向他端部における円弧凹部１０７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１０９が形成されている。また、円弧凸部１０６および円弧凹部１０７は、第１積層部材１０１を並べたとき、円弧凸部１０６と円弧凹部１０７とが嵌って第１積層部材１０１同士の回動を案内する。円弧凸部１０６及び円弧凹部１０７は半径Ｒ１をもつ円弧から形成されている。また、円弧凸部１０６及び円弧凹部１０７を形成する円弧の中心は積層分割環状部１０２上に存在する。 At one end of the laminated divided annular portion 102, an arc convex portion 106 having an arc and protruding in the circumferential direction is formed. The arcuate convex portion 106 is formed in the outer periphery of the laminated divided annular portion and is formed on a surface perpendicular to the plate thickness direction of the first laminated member 101. Further, an arc recess 107 having an arc and recessed in the circumferential direction is formed at the other end of the laminated divided annular portion 102. The arc recess 107 is formed on a surface perpendicular to the plate thickness direction of the first laminated member 101. The arc of the arc recess 107 is a 90 degree arc (1/4 of a circle). A linear portion 109 extending outward in the radial direction of the annular portion 8 is formed on the radially outer side of the annular portion 8 from the circular arc recess 107 at the other circumferential end of the laminated divided annular portion 102. Further, the arc convex portion 106 and the arc concave portion 107 guide the rotation of the first laminated members 101 by fitting the arc convex portion 106 and the arc concave portion 107 when the first laminated members 101 are arranged. The circular arc convex portion 106 and the circular arc concave portion 107 are formed from circular arcs having a radius R1. The center of the arc that forms the arc convex portion 106 and the arc concave portion 107 exists on the laminated divided annular portion 102.

円弧凸部１０６及び円弧凹部１０７からみて積層分割環状部１０２の径方向内側には、隣り合う分割コア９の回動の（閉時の）終端位置で当接する当接面としての周方向当接面１０８（１０８ａ，１０８ｂ）が形成されている。周方向当接面１０８（１０８ａ，１０８ｂ）は、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、円弧凸部１０６および円弧凹部１０７の円弧の中心は、周方向当接面１０８（１０８ａ，１０８ｂ）の延長線上に設定されている。 Circumferential contact as a contact surface that contacts the end position of rotation of the adjacent divided core 9 (when closed) on the radially inner side of the laminated divided annular portion 102 when viewed from the circular arc convex portion 106 and the circular arc concave portion 107 Surfaces 108 (108a, 108b) are formed. The circumferential contact surface 108 (108a, 108b) 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. Moreover, the center of the circular arc of the circular arc convex part 106 and the circular arc recessed part 107 is set on the extended line of the circumferential direction contact surface 108 (108a, 108b).

図４（ａ）（ｂ）は第２積層部材２０１を示す。第２積層部材２０１は、第１積層部材１０１と同様、分割コア９の分割環状部１０を形成する積層分割環状部２０２と、分割コア９のティース部７を形成する積層ティース部２０３とを備える。 4A and 4B show the second laminated member 201. FIG. Similar to the first laminated member 101, the second laminated member 201 includes a laminated divided annular portion 202 that forms the divided annular portion 10 of the divided core 9 and a laminated tooth portion 203 that forms the tooth portion 7 of the divided core 9. .

積層ティース部２０３には板厚方向（軸方向）の一方に第２嵌合凸部２０４が配設されるとともに、板厚方向の他方に第２嵌合凹部２０５が形成されている。第２嵌合凹部２０５と第２嵌合凸部２０４は、板厚方向に並んで形成されるとともに、その組が積層ティース部２０３の延設方向に２つ並んで形成されている。 The laminated tooth portion 203 is provided with a second fitting convex portion 204 on one side in the plate thickness direction (axial direction) and a second fitting concave portion 205 on the other side in the plate thickness direction. The second fitting concave portion 205 and the second fitting convex portion 204 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 laminated tooth portion 203.

積層分割環状部２０２の一端には、円弧を持ち周方向に突出する円弧凸部２０６が形成されている。円弧凸部２０６は積層分割環状部の外周内に形成されると共に、第２積層部材２０１の板厚方向に対して垂直な面上に形成される。また、積層分割環状部２０２の他端には、円弧を持ち周方向に窪む円弧凹部２０７が形成されている。円弧凹部２０７は、第２積層部材２０１の板厚方向に対して垂直な面上に形成されている。円弧凹部２０７の円弧は９０度の円弧（円の１／４）である。そして、積層分割環状部２０２の周方向他端部における円弧凹部２０７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２０９が形成されている。また、円弧凸部２０６および円弧凹部２０７は、第２積層部材２０１を並べたとき、円弧凸部２０６と円弧凹部２０７とが嵌って第２積層部材２０１同士の回動を案内する。円弧凸部２０６及び円弧凹部２０７は、第１積層部材１０１と同様、半径Ｒ１をもつ円弧から形成されている。また、円弧凸部２０６及び円弧凹部２０７を形成する円弧の中心は積層分割環状部２０２上に存在する。 At one end of the laminated divided annular portion 202, an arc convex portion 206 having an arc and protruding in the circumferential direction is formed. The arcuate convex portion 206 is formed within the outer periphery of the laminated divided annular portion, and is formed on a surface perpendicular to the plate thickness direction of the second laminated member 201. Further, an arc recess 207 having an arc and being recessed in the circumferential direction is formed at the other end of the laminated divided annular portion 202. The circular arc recess 207 is formed on a surface perpendicular to the plate thickness direction of the second laminated member 201. The arc of the arc recess 207 is a 90 degree arc (1/4 of a circle). A linear portion 209 extending outward in the radial direction of the annular portion 8 is formed on the radially outer side of the annular portion 8 from the circular arc recess 207 at the other circumferential end of the laminated divided annular portion 202. Further, when the second laminated member 201 is arranged, the arc convex portion 206 and the arc concave portion 207 guide the rotation of the second laminated member 201 by fitting the arc convex portion 206 and the arc concave portion 207. The arc convex portion 206 and the arc concave portion 207 are formed from arcs having a radius R1 as in the first laminated member 101. Further, the center of the arc forming the arc convex portion 206 and the arc concave portion 207 exists on the laminated division annular portion 202.

円弧凸部２０６及び円弧凹部２０７からみて積層分割環状部２０２の径方向内側には、隣り合う分割コア９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２０８（２０８ａ，２０８ｂ）が形成されている。周方向当接面２０８（２０８ａ，２０８ｂ）は、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、円弧凸部２０６および円弧凹部２０７の円弧の中心は、周方向当接面２０８（２０８ａ，２０８ｂ）の延長線上に設定されている。 When viewed from the circular arc convex portion 206 and the circular arc concave portion 207, on the radially inner side of the laminated divided annular portion 202, there is a circumferential contact as a terminal contact surface that makes contact at the terminal position of rotation of the adjacent divided core 9 (when closed). The contact surface 208 (208a, 208b) is formed. The circumferential contact surface 208 (208a, 208b) 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. The center of the arc of the arc convex part 206 and the arc concave part 207 is set on an extension line of the circumferential contact surface 208 (208a, 208b).

図５（ａ）（ｂ）は第３積層部材３０１を示す。第３積層部材３０１は、第１積層部材１０１および第２積層部材２０１と同様、分割コア９の分割環状部１０を形成する積層分割環状部３０２と、分割コア９のティース部７を形成する積層ティース部３０３とを備える。 5A and 5B show the third laminated member 301. FIG. Similarly to the first laminated member 101 and the second laminated member 201, the third laminated member 301 is a laminated divided annular portion 302 that forms the divided annular portion 10 of the divided core 9 and a laminated portion that forms the tooth portion 7 of the divided core 9. And a teeth portion 303.

積層ティース部３０３には板厚方向（軸方向）の一方に第３嵌合凸部３０４が配設されるとともに、板厚方向の他方に第３嵌合凹部３０５が形成されている。第３嵌合凹部３０５と第３嵌合凸部３０４は、板厚方向に並んで形成されるとともに、その組が積層ティース部３０３の延設方向に２つ並んで形成されている。 In the laminated tooth portion 303, a third fitting convex portion 304 is disposed on one side in the plate thickness direction (axial direction), and a third fitting concave portion 305 is formed on the other side in the plate thickness direction. The third fitting concave portion 305 and the third fitting convex portion 304 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 laminated tooth portion 303.

積層分割環状部３０２の一端には、円弧を持ち周方向に突出する円弧凸部３０６が形成されている。円弧凸部３０６は積層分割環状部の外周内に形成されると共に、第３積層部材３０１の板厚方向に対して垂直な面上に形成される。また、積層分割環状部３０２の他端には、円弧を持ち周方向に窪む円弧凹部３０７が形成されている。円弧凹部３０７は、第３積層部材３０１の板厚方向に対して垂直な面上に形成されている。円弧凹部３０７の円弧は９０度の円弧（円の１／４）である。そして、積層分割環状部３０２の周方向他端部における円弧凹部３０７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３０９が形成されている。また、円弧凸部３０６および円弧凹部３０７は、第３積層部材３０１を並べたとき、円弧凸部３０６と円弧凹部３０７とが嵌って第３積層部材３０１同士の回動を案内する。第３積層部材３０１の円弧凸部３０６及び円弧凹部３０７は、第１積層部材１０１の円弧凸部１０６及び円弧凹部１０７の半径Ｒ１より大きな半径である半径Ｒ２をもつ円弧から形成されている。また、円弧凸部３０６及び円弧凹部３０７を形成する円弧の中心は積層分割環状部３０２上に存在する。 An arc convex portion 306 having an arc and protruding in the circumferential direction is formed at one end of the laminated divided annular portion 302. The arcuate convex portion 306 is formed in the outer periphery of the laminated divided annular portion, and is formed on a surface perpendicular to the plate thickness direction of the third laminated member 301. In addition, an arc recess 307 having an arc and recessed in the circumferential direction is formed at the other end of the laminated divided annular portion 302. The arc recess 307 is formed on a surface perpendicular to the plate thickness direction of the third laminated member 301. The arc of the arc recess 307 is a 90-degree arc (1/4 of a circle). A linear portion 309 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 307 at the other circumferential end of the laminated divided annular portion 302. Further, when the third laminated member 301 is arranged, the arc convex portion 306 and the arc concave portion 307 are fitted with the arc convex portion 306 and the arc concave portion 307 to guide the rotation of the third laminated member 301. The arc convex portion 306 and the arc concave portion 307 of the third laminated member 301 are formed from arcs having a radius R2 that is larger than the radius R1 of the arc convex portion 106 and the arc concave portion 107 of the first laminated member 101. Further, the center of the arc forming the arc convex portion 306 and the arc concave portion 307 exists on the laminated division annular portion 302.

円弧凸部３０６及び円弧凹部３０７からみて積層分割環状部３０２の径方向内側には、隣り合う分割コア９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３０８（３０８ａ，３０８ｂ）が形成されている。周方向当接面３０８（３０８ａ，３０８ｂ）は、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、円弧凸部３０６および円弧凹部３０７の円弧の中心は、周方向当接面３０８（３０８ａ，３０８ｂ）の延長線上に設定されている。 When viewed from the circular arc convex portion 306 and the circular arc concave portion 307, the radial inner side of the laminated divided annular portion 302 is a circumferential contact surface as a terminal contact surface that contacts the terminal position of the rotation of the adjacent divided core 9 (when closed). Contact surfaces 308 (308a, 308b) are formed. The circumferential contact surfaces 308 (308a, 308b) extend in the radial direction of the annular portion 8 (that is, are formed radially) so as to contact in the circumferential direction at the end position of rotation. The center of the arc of the arc convex portion 306 and the arc concave portion 307 is set on an extension line of the circumferential contact surface 308 (308a, 308b).

第３積層部材３０１の円弧凸部３０６及び円弧凹部３０７は、第１積層部材１０１および第２積層部材２０１の円弧凸部３０６及び円弧凹部を形成する円弧の半径よりも大きく設定されている。よって、ティース部７からみて円弧凸部３０６の周方向端部の長さは第１積層部材１０１及び第２積層部材２０１のそれよりも長くなっている。 The arc convex portion 306 and the arc concave portion 307 of the third laminated member 301 are set to be larger than the radius of the arc that forms the arc convex portion 306 and the arc concave portion of the first laminated member 101 and the second laminated member 201. Therefore, when viewed from the tooth portion 7, the length of the end portion in the circumferential direction of the arc convex portion 306 is longer than that of the first laminated member 101 and the second laminated member 201.

図６（ａ）（ｂ）は第４積層部材４０１を示す。第４積層部材４０１は、第１積層部材１０１、第２積層部材２０１および第３積層部材３０１と同様、分割コア９の分割環状部１０を形成する積層分割環状部４０２と、分割コア９のティース部７を形成する積層ティース部４０３とを備える。 FIGS. 6A and 6B show the fourth laminated member 401. Similar to the first laminated member 101, the second laminated member 201, and the third laminated member 301, the fourth laminated member 401 includes a laminated divided annular portion 402 that forms the divided annular portion 10 of the divided core 9, and teeth of the divided core 9. And a laminated tooth portion 403 that forms the portion 7.

積層ティース部４０３には板厚方向（軸方向）の一方に第４嵌合凸部４０４が配設されるとともに、板厚方向の他方に第４嵌合凹部４０５が形成されている。第４嵌合凹部４０５と第４嵌合凸部４０４は、板厚方向に並んで形成されるとともに、その組が積層ティース部４０３の延設方向に２つ並んで形成されている。 The laminated tooth portion 403 is provided with a fourth fitting convex portion 404 on one side in the plate thickness direction (axial direction) and a fourth fitting concave portion 405 on the other side in the plate thickness direction. The fourth fitting concave portion 405 and the fourth fitting convex portion 404 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 laminated tooth portion 403.

積層分割環状部４０２の一端には、円弧を持ち周方向に突出する円弧凸部４０６が形成されている。円弧凸部４０６は積層分割環状部の外周内に形成されると共に、第４積層部材４０１の板厚方向に対して垂直な面上に形成される。また、積層分割環状部４０２の他端には、円弧を持ち周方向に窪む円弧凹部４０７が形成されている。円弧凹部４０７は、第４積層部材４０１の板厚方向に対して垂直な面上に形成されている。円弧凹部４０７の円弧は９０度の円弧（円の１／４）である。そして、積層分割環状部４０２の周方向他端部における円弧凹部４０７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４０９が形成されている。また、円弧凸部４０６および円弧凹部４０７は、第４積層部材４０１を並べたとき、円弧凸部４０６と円弧凹部４０７とが嵌って第４積層部材４０１同士の回動を案内する。第４積層部材４０１の円弧凸部４０６及び円弧凹部４０７は、第１積層部材１０１の円弧凸部１０６及び円弧凹部１０７の半径Ｒ１より大きな半径である半径Ｒ２をもつ円弧から形成されている。また、円弧凸部４０６及び円弧凹部４０７を形成する円弧の中心は積層分割環状部４０２上に存在する。 At one end of the laminated divided annular portion 402, an arc convex portion 406 that has an arc and protrudes in the circumferential direction is formed. The arcuate convex portion 406 is formed in the outer periphery of the laminated divided annular portion and is formed on a surface perpendicular to the plate thickness direction of the fourth laminated member 401. Further, an arc recess 407 having an arc and recessed in the circumferential direction is formed at the other end of the laminated divided annular portion 402. The arc recess 407 is formed on a surface perpendicular to the plate thickness direction of the fourth laminated member 401. The arc of the arc recess 407 is a 90 degree arc (1/4 of a circle). A linear portion 409 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 407 at the other circumferential end of the laminated divided annular portion 402. In addition, the arc convex portion 406 and the arc concave portion 407 guide the rotation of the fourth laminated members 401 by fitting the arc convex portion 406 and the arc concave portion 407 when the fourth laminated members 401 are arranged. The arcuate convex portion 406 and the arcuate concave portion 407 of the fourth laminated member 401 are formed from arcs having a radius R2 that is larger than the radius R1 of the arc convex portion 106 and the arc concave portion 107 of the first laminated member 101. The center of the arc forming the arc convex part 406 and the arc concave part 407 exists on the laminated divided annular part 402.

円弧凸部４０６及び円弧凹部４０７からみて積層分割環状部４０２の径方向内側には、隣り合う分割コア９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４０８（４０８ａ，４０８ｂ）が形成されている。周方向当接面４０８（４０８ａ，４０８ｂ）は、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、円弧凸部４０６および円弧凹部４０７の円弧の中心は、周方向当接面４０８（４０８ａ，４０８ｂ）の延長線上に設定されている。 When viewed from the circular arc convex portion 406 and the circular arc concave portion 407, the circumferentially inner side of the laminated divided annular portion 402 as a terminal contact surface that contacts the terminal position of the rotation of the adjacent divided core 9 (when closed) is provided. A contact surface 408 (408a, 408b) is formed. The circumferential contact surfaces 408 (408a, 408b) are formed so as to extend in the radial direction of the annular portion 8 (that is, to be radially formed) and to contact in the circumferential direction at the end position of rotation. The center of the arc of the arc convex part 406 and the arc concave part 407 is set on an extension line of the circumferential contact surface 408 (408a, 408b).

第３積層部材３０１と第４積層部材４０１とはティース部７を対称軸として対称に形成されている。よって、積層すると、第３積層部材３０１の円弧凸部３０６側と第４積層部材４０１の円弧凹部４０７側とが当接する。 The third laminated member 301 and the fourth laminated member 401 are formed symmetrically with the tooth portion 7 as the axis of symmetry. Therefore, when laminated, the arcuate convex portion 306 side of the third laminated member 301 comes into contact with the arcuate concave portion 407 side of the fourth laminated member 401.

第４積層部材４０１の円弧凸部４０６及び円弧凹部４０７は、第１積層部材１０１および第２積層部材２０１の円弧凸部１０６、２０６及び円弧凹部１０７、２０７を形成する円弧の半径よりも大きく設定されている。よって、ティース部７からみて円弧凸部４０６の周方向端部の長さは第１積層部材１０１及び第２積層部材２０１のそれよりも長くなっている。 The arc convex portion 406 and the arc concave portion 407 of the fourth laminated member 401 are set larger than the radius of the arc that forms the arc convex portions 106 and 206 and the arc concave portions 107 and 207 of the first laminated member 101 and the second laminated member 201. Has been. Therefore, when viewed from the tooth portion 7, the length of the circumferential end portion of the arc convex portion 406 is longer than that of the first laminated member 101 and the second laminated member 201.

第１積層部材１０１、第２積層部材２０１、第３積層部材３０１および第４積層部材４０１の円弧凸部１０６、２０６、３０６、４０６および円弧凹部１０７、２０７、３０７、４０７を形成する円弧の中心は分割コア９を形成した後に同軸上に存在する。 The center of the arc forming the arc convex portions 106, 206, 306, 406 and the arc concave portions 107, 207, 307, 407 of the first laminated member 101, the second laminated member 201, the third laminated member 301, and the fourth laminated member 401 Exists on the same axis after the split core 9 is formed.

図７（ａ）に第１積層部材１０１、第２積層部材２０１、第３積層部材３０１および第４積層部材４０１を積層させることによって形成された分割コア９の環状部８の端部の拡大図を示す。分割コア９は各積層部材に形成された嵌合凹部１０５，２０５、３０５、４０５及び嵌合凸部１０４、２０４、３０４、４０４を嵌合させることによって軸方向における各積層部材の相対移動を規制する。 FIG. 7A is an enlarged view of the end of the annular portion 8 of the split core 9 formed by laminating the first laminated member 101, the second laminated member 201, the third laminated member 301, and the fourth laminated member 401. Indicates. The split core 9 regulates the relative movement of each laminated member in the axial direction by fitting the fitting concave portions 105, 205, 305, 405 and the fitting convex portions 104, 204, 304, 404 formed in each laminated member. To do.

また、円弧凸部１０６、２０６、３０６、４０６および円弧凹部１０７、２０７、３０７、４０７を交互に積層させることによって、軸方向に凹凸を形成する。また、図７（ｂ）に図７（ａ）のＡ−Ａ線断面図を示す。第１積層部材１０１、第２積層部材２０１、第３積層部材３０１および第４積層部材４０１の積層分割環状部１０２、２０２、３０２、４０２の長さは、円弧凸部１０６、２０６、３０６、４０６及び円弧凹部１０７、２０７、３０７、４０７の組み合わせによって変化する。また、円弧凸部１０６、２０６、３０６、４０６および円弧凹部１０７、２０７、３０７、４０７を形成する円弧の半径の違いによっても変化する。よって、各分割コア９間のクリアランスが分散される。 Further, by alternately laminating the arc convex portions 106, 206, 306, 406 and the arc concave portions 107, 207, 307, 407, irregularities are formed in the axial direction. FIG. 7B is a cross-sectional view taken along line AA in FIG. The lengths of the laminated divided annular portions 102, 202, 302, and 402 of the first laminated member 101, the second laminated member 201, the third laminated member 301, and the fourth laminated member 401 are arc convex portions 106, 206, 306, and 406, respectively. And the combination of the circular arc recesses 107, 207, 307, and 407. Moreover, it changes also by the difference in the radius of the circular arc which forms circular arc convex part 106,206,306,406 and circular arc recessed part 107,207,307,407. Therefore, the clearance between the divided cores 9 is dispersed.

詳しくは、図８の如く、周方向に隣り合う２つの第１積層部材１０１間に形成されるクリアランス１１０と、周方向に隣り合う２つの第３積層部材３０１間に形成されるクリアランス３１０は、位置が周方向にずれている。同様に、周方向に隣り合う２つの第２積層部材２０１間に形成されるクリアランス２１０と、周方向に隣り合う２つの第４積層部材４０１間に形成されるクリアランス４１０は、位置が周方向にずれている。 Specifically, as shown in FIG. 8, a clearance 110 formed between two first laminated members 101 adjacent in the circumferential direction and a clearance 310 formed between two third laminated members 301 adjacent in the circumferential direction are: The position is shifted in the circumferential direction. Similarly, a clearance 210 formed between two second laminated members 201 adjacent in the circumferential direction and a clearance 410 formed between two fourth laminated members 401 adjacent in the circumferential direction are positioned in the circumferential direction. It's off.

第１積層部材１０１を通過する磁束は、その周方向端部のクリアランス１１０において軸方向に隣接する第２積層部材２０１を通過する。同様に、第３積層部材３０１を通過する磁束は、その端部端部のクリアランス３１０において軸方向に隣接する第２積層部材２０１と第４積層部材４０１を通過する。そして、第１積層部材１０１間のクリアランス１１０と、第３積層部材３０１間のクリアランス３１０とが周方向にずれているため、第１積層部材１０１が第２積層部材２０１に向う磁束の位置と、第３積層部材３０１から第２積層部材２０１へ向う磁束の位置は周方向にずれている。 The magnetic flux passing through the first laminated member 101 passes through the second laminated member 201 adjacent in the axial direction at the clearance 110 at the circumferential end. Similarly, the magnetic flux passing through the third laminated member 301 passes through the second laminated member 201 and the fourth laminated member 401 that are adjacent in the axial direction at the clearance 310 at the end of the end. And since the clearance 110 between the 1st lamination members 101 and the clearance 310 between the 3rd lamination members 301 have shifted in the peripheral direction, the position of the magnetic flux which the 1st lamination member 101 goes to the 2nd lamination member 201, The position of the magnetic flux from the third laminated member 301 toward the second laminated member 201 is shifted in the circumferential direction.

従って、第２積層部材２０１において、第１積層部材１０１から第２積層部材２０１に移動した磁束の通過する個所と、第３積層部材３０１から第２積層部材２０１に移動した磁束の通過する個所が周方向にずれる。また、同様に、第３積層部材３０１において、第２積層部材２０１から第３積層部材３０１に移動した磁束の通過する個所と、第４積層部材４０１から第３積層部材３０１に移動した磁束の通過する個所が周方向にずれる。このため、磁束の集中が緩和され、磁気飽和になりにくい。 Therefore, in the second laminated member 201, there are a part through which the magnetic flux moved from the first laminated member 101 to the second laminated member 201 and a part through which the magnetic flux moved from the third laminated member 301 to the second laminated member 201 passes. Shift in the circumferential direction. Similarly, in the third laminated member 301, the location where the magnetic flux moved from the second laminated member 201 to the third laminated member 301 passes, and the passage of the magnetic flux moved from the fourth laminated member 401 to the third laminated member 301. The place to do is shifted in the circumferential direction. For this reason, the concentration of magnetic flux is alleviated and magnetic saturation is unlikely to occur.

以上のように形成された分割コア９は図２に示すように分割コア９を構成する各積層部材に形成された円弧凸部１０６、２０６、３０６、４０６及び円弧凹部１０７、２０７、３０７、４０７に添って連結される。各分割コア９にインシュレータ４を装着し、ティース部７に巻線５を巻装する。巻線５の巻装された複数の分割コア９をハウジング３の内周面に当接することによって、分割コア９の径方向の変位および回動が規制され、図１に示すブラシレスモータを得る。 As shown in FIG. 2, the split core 9 formed as described above includes the arc convex portions 106, 206, 306, and 406 and the arc concave portions 107, 207, 307, and 407 formed in the respective laminated members constituting the split core 9. Are linked together. The insulator 4 is attached to each divided core 9, and the winding 5 is wound around the tooth portion 7. By bringing the plurality of divided cores 9 wound with the windings 5 into contact with the inner peripheral surface of the housing 3, the radial displacement and rotation of the divided cores 9 are restricted, and the brushless motor shown in FIG. 1 is obtained.

上記したように、本実施形態によれば、以下の効果を有する。
（１）積層分割環状部１０２、２０２、３０２、４０２の周方向の長さの異なる積層部材を積層させることによって、周方向の嵌合部のクリアランス１１０，２１０，３１０，４１０を各層ごとに周方向に分散させることができる。よって、図８に示す磁気流れ線図のように、磁束（図中の点線）が軸方向に隣接した積層部材１０１，２０１，３０１，４０１を移動する位置を周方向に分散させることが可能となる。磁気流れを分散させることによって、磁束の集中が緩和され、磁気飽和しにくくすることが可能となる。 As described above, the present embodiment has the following effects.
(1) By laminating laminated members having different circumferential lengths of the laminated divided annular portions 102, 202, 302, and 402, the clearances 110, 210, 310, and 410 of the circumferential fitting portions are circumferentially arranged for each layer. Can be dispersed in the direction. Therefore, as in the magnetic flow diagram shown in FIG. 8, it is possible to disperse in the circumferential direction the position where the magnetic flux (dotted line in the figure) moves the laminated members 101, 201, 301, 401 adjacent in the axial direction. Become. By dispersing the magnetic flow, the concentration of magnetic flux is relaxed, and it becomes possible to make magnetic saturation difficult.

（２）周方向の嵌合部を円弧凹部１０７、２０７、３０７、４０７および円弧凸部１０６、２０６、３０６，４０６のように円弧状の凹凸部とすることによって、分割コア９同士の嵌合を容易にすることが可能となる。 (2) Fitting of the split cores 9 to each other by making the circumferential fitting portions arc-shaped uneven portions such as the arc concave portions 107, 207, 307, 407 and the arc convex portions 106, 206, 306, 406 Can be facilitated.

（３）円弧凸部１０６、２０６、３０６、４０６および円弧凹部１０７、２０７、３０７、４０７を形成する円弧の中心を一致させることによって、その円弧中心を分割コア９の回動中心とすることが可能となる。また、円弧中心が同軸上で半径の異なる円弧によって円弧凸部１０６、２０６、３０６、４０６および円弧凹部１０７、２０７、３０７、４０７を形成することによって、分割コア同士の回動の回動中心をステータコア６の環状部８上に配設することができる。よって、インシュレータ４の回動軸１１をハウジング３の内周側に配設することが可能となる。 (3) By matching the centers of the arcs forming the arc convex portions 106, 206, 306, 406 and the arc concave portions 107, 207, 307, 407, the arc center can be set as the rotation center of the split core 9. It becomes possible. Further, by forming the circular arc convex portions 106, 206, 306, 406 and the circular arc concave portions 107, 207, 307, 407 by circular arcs whose coaxial centers are coaxial and have different radii, the rotation center of the rotation between the divided cores can be obtained. It can be disposed on the annular portion 8 of the stator core 6. Therefore, the rotating shaft 11 of the insulator 4 can be disposed on the inner peripheral side of the housing 3.

（４）円弧凸部１０６、２０６、３０６、４０６および円弧凹部１０７、２０７、３０７、４０７の円弧を半円未満とすることによって、円弧凸部の周方向へ突出する面積を小さくすることができる。よって、軸方向の寸法が安定するとともに、隣接する円弧凹部への嵌合が容易となる。また、嵌合後の軸方向の円弧凸部同士の重なる面積を広くすることができる。よって、軸方向の剛性を高めると共に磁気抵抗を低減することが可能となる。 (4) By making the arcs of the arc convex portions 106, 206, 306, 406 and the arc concave portions 107, 207, 307, 407 less than a semicircle, the area protruding in the circumferential direction of the arc convex portion can be reduced. . Therefore, the dimension in the axial direction is stabilized, and the fitting into the adjacent arc recess is facilitated. Further, the overlapping area of the arcuate convex portions in the axial direction after the fitting can be increased. Therefore, it is possible to increase the axial rigidity and reduce the magnetic resistance.

（５）円弧凸部１０６、２０６、３０６、４０６及び円弧凹部１０７、２０７、３０７、４０７により分割コア９の位置決めが容易となるとともに、周方向当接面１０８，２０８，３０８，４０８により分割コア９端部の磁気飽和が抑制される。また、周方向当接面１０８，２０８，３０８，４０８により周方向の剛性が向上する。さらに、周方向当接面１０８，２０８，３０８，４０８は円弧凸部１０６、２０６、３０６、４０６及び円弧凹部１０７、２０７、３０７、４０７よりも内径側に形成されているため、分割コア９の径方向内側（ロータ側）への移動も抑制される。 (5) The positioning of the split core 9 is facilitated by the circular arc convex portions 106, 206, 306, 406 and the circular arc concave portions 107, 207, 307, 407, and the split core is formed by the circumferential contact surfaces 108, 208, 308, 408. Nine-end magnetic saturation is suppressed. Further, circumferential rigidity is improved by the circumferential contact surfaces 108, 208, 308, and 408. Furthermore, since the circumferential contact surfaces 108, 208, 308, and 408 are formed on the inner diameter side of the arc convex portions 106, 206, 306, and 406 and the arc concave portions 107, 207, 307, and 407, Movement to the radially inner side (rotor side) is also suppressed.

尚、本発明の実施形態は、以下のように変更してもよい。
○上記実施形態では、４種類の積層部材を用いて分割コア９を形成した。しかし、積層部材の形状のパターンが多いほど、嵌合部のクリアランスは分散され、周方向の磁気密度を均一に保つことに貢献する。よって、積層部材の形状のパターンは４種類に限定されることは無く、適宜変更可能である。 In addition, you may change embodiment of this invention as follows.
In the above embodiment, the split core 9 is formed using four types of laminated members. However, the larger the pattern of the shape of the laminated member, the more the clearance of the fitting portion is dispersed, which contributes to keeping the magnetic density in the circumferential direction uniform. Therefore, the pattern of the shape of the laminated member is not limited to four types and can be changed as appropriate.

○上記実施形態では、円弧凸部１０６、２０６、３０６、４０６および円弧凹部１０７、２０７、３０７、４０７を交互に積層した。しかし、必ずしも円弧凸部１０６、２０６、３０６、４０６と円弧凹部１０７、２０７、３０７、４０７を交互に積層させる必要は無い。この際、積層分割環状部１０２、２０２、３０２、４０２の周方向の長さが各層で異なっているため、分割コア９の嵌合部には凹凸が存在する。よって、円弧凸部１０６、２０６、３０６、４０６及び円弧凹部１０７、２０７、３０７、４０７を交互に積層させた場合と同様、分割コア９同士の軸方向のずれは抑制される。 In the above embodiment, the arc convex portions 106, 206, 306, 406 and the arc concave portions 107, 207, 307, 407 are alternately stacked. However, it is not always necessary to alternately stack the arc convex portions 106, 206, 306, 406 and the arc concave portions 107, 207, 307, 407. At this time, since the circumferential lengths of the laminated divided annular portions 102, 202, 302, and 402 are different in each layer, the fitting portion of the divided core 9 has irregularities. Therefore, as in the case where the arc convex portions 106, 206, 306, and 406 and the arc concave portions 107, 207, 307, and 407 are alternately stacked, the axial displacement between the divided cores 9 is suppressed.

○上記実施形態では、円弧凸部１０６、２０６、３０６、４０６がほぼ半円となるように形成した。しかし、図９に示すように半円未満の円弧から形成してもよい。このように形成することによって分割コア９間を嵌合したときの軸方向の当接面積が大きくなり、軸方向の磁気抵抗を低減することが可能となる。また、分割コア９同士の周方向当接面１０８，２０８，３０８，４０８も大きくなるため、周方向の磁気抵抗を低減することが可能となる。 In the above embodiment, the circular arc convex portions 106, 206, 306, and 406 are formed so as to be substantially semicircular. However, it may be formed from an arc less than a semicircle as shown in FIG. By forming in this way, the contact area in the axial direction when the divided cores 9 are fitted to each other is increased, and the magnetic resistance in the axial direction can be reduced. Further, since the circumferential contact surfaces 108, 208, 308, and 408 between the split cores 9 are also increased, it is possible to reduce the circumferential magnetic resistance.

○上記実施形態では、分割コア９の周方向当接面１０８，２０８，３０８，４０８を同軸上に形成した。しかし、図１０に示すように、分割コア９同士の周方向当接面１０８，２０８，３０８，４０８の位置を周方向に分散させても良い。この場合、嵌合部のクリアランス１１０，２１０，３１０，４１０のみならず、周方向当接面１０８，２０８，３０８，４０８で発生する磁束の移動を周方向にずらすことができる。よって、磁束の集中をより緩和することが可能となる。また、このような構成にすることによって、周方向当接面１０８，２０８，３０８，４０８は大きくなり、周方向の磁気抵抗を低減される。 In the above embodiment, the circumferential contact surfaces 108, 208, 308, and 408 of the split core 9 are formed coaxially. However, as shown in FIG. 10, the positions of the circumferential contact surfaces 108, 208, 308, and 408 between the split cores 9 may be dispersed in the circumferential direction. In this case, not only the clearance 110, 210, 310, 410 of the fitting portion but also the movement of the magnetic flux generated on the circumferential contact surfaces 108, 208, 308, 408 can be shifted in the circumferential direction. Therefore, it is possible to further reduce the concentration of magnetic flux. Further, by adopting such a configuration, the circumferential contact surfaces 108, 208, 308, and 408 are enlarged, and the circumferential magnetic resistance is reduced.

○上記実施形態では、円弧凸部１０６、２０６、３０６、４０６および円弧凹部１０７、２０７、３０７、４０７を形成する円弧の中心を軸方向に一致させた。しかし、図１１に示すように各積層部材において円弧中心をずらして形成してもよい。このような構成とした場合でも、ティース部７から周方向の嵌合部のクリアランス１１０，２１０，３１０，４１０までの位置が各層ごとに異なっていれば磁気密度の集中を避けることは可能である。 In the embodiment described above, the centers of the arcs forming the arc convex portions 106, 206, 306, 406 and the arc concave portions 107, 207, 307, 407 are made to coincide with each other in the axial direction. However, as shown in FIG. 11, the center of the arc may be shifted in each laminated member. Even in such a configuration, it is possible to avoid concentration of magnetic density if the positions from the teeth portion 7 to the clearances 110, 210, 310, 410 of the circumferential fitting portions are different for each layer. .

○上記実施形態では、積層部材の形状を１層毎に変更した。しかし、図１２に示すように、積層部材６０１，６０２，６０３，６０４の形状を２層毎に変化させても良い。
○上記実施形態では、各層において同じ積層部材が周方向に配設されている。しかし、環状部の長さの異なる積層部材を周方向に並べても良い。また、上記実施形態では、ティース部７から周方向に対称に積層環状部が伸びている。しかし、環状部に対するティース部の位置を周方向一方に偏らせても良い。 In the above embodiment, the shape of the laminated member is changed for each layer. However, as shown in FIG. 12, the shape of the laminated members 601, 602, 603, and 604 may be changed every two layers.
In the above embodiment, the same laminated member is disposed in the circumferential direction in each layer. However, laminated members having different lengths of the annular portions may be arranged in the circumferential direction. Moreover, in the said embodiment, the lamination | stacking cyclic | annular part is extended from the teeth part 7 symmetrically in the circumferential direction. However, the position of the tooth portion with respect to the annular portion may be biased in one circumferential direction.

本実施の形態を適用したブラシレスモータの要部断面図。The principal part sectional drawing of the brushless motor to which this Embodiment is applied. （ａ）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 a stator core, (b) Same front view, (c) Same perspective view. （ａ）第１積層部材を示す平面図、（ｂ）同図（ａ）のＡ−Ａ断面図。(A) The top view which shows a 1st laminated member, (b) AA sectional drawing of the same figure (a). （ａ）第２積層部材を示す平面図、（ｂ）同図（ａ）のＢ−Ｂ断面図。(A) The top view which shows a 2nd laminated member, (b) BB sectional drawing of the same figure (a). （ａ）第３積層部材を示す平面図、（ｂ）同図（ａ）のＣ−Ｃ断面図。(A) The top view which shows a 3rd laminated member, (b) CC sectional drawing of the same figure (a). （ａ）第４積層部材を示す平面図、（ｂ）同図（ａ）のＤ−Ｄ断面図。(A) The top view which shows a 4th laminated member, (b) DD sectional drawing of the figure (a). （ａ）ステータコアの一部拡大平面図、（ｂ）同図（ａ）のＥ−Ｅ断面図。(A) Partial enlarged plan view of a stator core, (b) EE sectional view of FIG. 磁気流れを示した作用図。The action figure showing magnetic flow. 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. 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. 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. 別例における断面図。Sectional drawing in another example. 従来のステータコアにおける磁気流れを示した作用図。The action figure which showed the magnetic flow in the conventional stator core.

Explanation of symbols

６…ステータコア、７…ティース部、８…環状部、９…分割コア、１０…分割環状部、１１…回動軸、１０１…第１積層部材、２０１…第２積層部材、３０１…第３積層部材、４０１…第４積層部材、１０２，２０２，３０２，４０２…積層分割環状部、１０３，２０３，３０３，４０３…積層ティース部、１０６，２０６，３０６，４０６…円弧凸部、１０７，２０７，３０７，４０７…円弧凹部、１０８，２０８，３０８，４０８…周方向当接面、１１０，２１０，３１０，４１０…嵌合部のクリアランス、６０１，６０２，６０３，６０４…積層部材。 DESCRIPTION OF SYMBOLS 6 ... Stator core, 7 ... Teeth part, 8 ... Annular part, 9 ... Divided core, 10 ... Divided annular part, 11 ... Rotating shaft, 101 ... First laminated member, 201 ... Second laminated member, 301 ... Third laminated member 401, fourth laminated member, 102, 202, 302, 402 ... laminated divided annular part, 103, 203, 303, 403 ... laminated tooth part, 106, 206, 306, 406 ... arc convex part, 107, 207, 307, 407 ... circular arc recess, 108, 208, 308, 408 ... circumferential contact surface, 110, 210, 310, 410 ... clearance of fitting part, 601, 602, 603, 604 ... laminated member.

Claims

A brushless motor comprising a stator including a core composed of a substantially cylindrical annular portion and a tooth portion extending in a substantially orthogonal direction of the annular portion, and a rotor accommodated on the inner peripheral side of the stator,
The core is composed of a plurality of split cores each including a split annular portion obtained by dividing the annular portion in the circumferential direction and the teeth portion;
Each of the divided cores includes, at the circumferential end, a convex portion and a concave portion that engage with the divided core adjacent in the circumferential direction,
Each of the divided cores is formed by laminating a plurality of laminated members such that the lengths of the plurality of convex portions formed at the circumferential end portion or the depths of the plurality of concave portions are different. Brushless motor.

The brushless motor according to claim 1,
The laminated member includes a planar contact surface that contacts the laminated member adjacent in the circumferential direction at the circumferential end.

The brushless motor according to claim 1 or 2,
The laminated member includes an arc convex portion protruding in an arc convex shape in the circumferential direction at one end of the circumferential end portion, and an arc concave arc concave portion that fits into the arc convex portion of the adjacent laminated member at the other end. A brushless motor characterized by comprising.

The brushless motor according to claim 2 or 3,
The split core is constituted by the laminated member having coaxially the center of an arc forming the arc convex portion and the arc concave portion of the laminated members.

The brushless motor according to claim 4,
The split core is constituted by the laminated member that is different only in the radius of the arc that forms the arc convex part and the arc concave part of the laminated members.

A brushless motor comprising a stator including a core composed of a substantially cylindrical annular portion and a tooth portion extending in a substantially orthogonal direction of the annular portion, and a rotor accommodated on the inner peripheral side of the stator,
The core is composed of a plurality of split cores each including a split annular portion obtained by dividing the annular portion in the circumferential direction and the teeth portion;
The split core includes an arc convex portion and an arc concave portion that are fitted to the circumferentially adjacent split core at the circumferential end portion, and the arc convex portion that is in contact with the split core adjacent to the circumferential end portion. And a plurality of laminated members each having an abutting surface formed on the inner diameter side of the arc recess, and a brushless motor.

The brushless motor according to any one of claims 2 to 6,
The arc-shaped convex portion and the arc-shaped concave portion are formed from arcs less than a semicircle.