JP5460095B2 - Brushless motor - Google Patents

Brushless motor Download PDF

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JP5460095B2
JP5460095B2 JP2009077595A JP2009077595A JP5460095B2 JP 5460095 B2 JP5460095 B2 JP 5460095B2 JP 2009077595 A JP2009077595 A JP 2009077595A JP 2009077595 A JP2009077595 A JP 2009077595A JP 5460095 B2 JP5460095 B2 JP 5460095B2
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bus bar
phase
connection
coil
neutral point
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JP2010233327A (en
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敦志 岡本
弘達 池野
剛典 福島
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株式会社ミツバ
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/04Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28Layout of windings or of connections between windings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K3/00Details of windings
    • H02K3/46Fastening of windings on the stator or rotor structure
    • H02K3/52Fastening salient pole windings or connections thereto
    • H02K3/521Fastening salient pole windings or connections thereto applicable to stators only
    • H02K3/522Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K2203/00Specific aspects not provided for in the other groups of this subclass relating to the windings
    • H02K2203/06Machines characterised by the wiring leads, i.e. conducting wires for connecting the winding terminations
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K2203/00Specific aspects not provided for in the other groups of this subclass relating to the windings
    • H02K2203/09Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations

Description

この発明は、バスバーユニットを介してステータのコイルに給電を行い、ロータを回転させるブラシレスモータに関するものである。   The present invention relates to a brushless motor that supplies power to a coil of a stator via a bus bar unit and rotates a rotor.

一般に、インナーロータ型のブラシレスモータは、モータケースに内嵌固定されたステータと、モータケースの径方向中央に配置されステータに対して回転自在に支持されたロータとを有している。ロータの外周面には、複数の永久磁石が配設されている。ステータは、略円筒状のステータコアと、このステータコアから径方向内側に突設された複数のティースとを備えている。
各ティースには、絶縁材である樹脂製のインシュレータが装着され、このインシュレータを介してコイルが巻装されている。 A resin insulator, which is an insulating material, is attached to each tooth, and a coil is wound through the insulator. そして、コイルに外部電源からの電力が給電されると、コイルに発生する磁束と永久磁石との間に吸引力、または反発力が生じロータが回転する。 Then, when electric power from an external power source is supplied to the coil, an attractive force or a repulsive force is generated between the magnetic flux generated in the coil and the permanent magnet, and the rotor rotates. In general, an inner rotor type brushless motor has a stator that is fitted and fixed in a motor case, and a rotor that is disposed at the center in the radial direction of the motor case and is rotatably supported by the stator. A plurality of permanent magnets are disposed on the outer peripheral surface of the rotor. The stator includes a substantially cylindrical stator core and a plurality of teeth projecting radially inward from the stator core. In general, an inner rotor type brushless motor has a tetrahydrofuran that is fitted and fixed in a motor case, and a rotor that is disposed at the center in the radial direction of the motor case and is rotatably supported by the stator. permanent magnets are disposed on the outer peripheral surface of the rotor. The stator includes a substantially cylindrical stator core and a plurality of teeth projecting similarly inward from the stator core.
A resin insulator, which is an insulating material, is attached to each tooth, and a coil is wound through the insulator. When power from an external power supply is supplied to the coil, an attractive force or a repulsive force is generated between the magnetic flux generated in the coil and the permanent magnet, and the rotor rotates. A resin insulator, which is an insulating material, is attached to each tooth, and a coil is wound through the insulator. When power from an external power supply is supplied to the coil, an attractive force or a repulsive force is generated between the magnetic flux generated in the coil and the permanent magnet, and the rotor rotates.

ところで、コイルへの給電手段として、小型化や組み付け性の向上化を図るために、ユニット化されたバスバーユニットを用いる場合がある。バスバーユニットは、略円環状に形成された樹脂モールド体に、金属製の複数のバスバーを互いに絶縁された状態で埋設したものである。例えば、コイルをスター結線方式にて結線する場合にあっては、樹脂モールド体に、各相のコイルに給電を行うための複数のバスバーと、中性点(コモン)を成すバスバーとが埋設されている。   By the way, as a means for supplying power to the coil, a unitized bus bar unit may be used in order to reduce the size or improve the assemblability. The bus bar unit is formed by embedding a plurality of metal bus bars in an insulated state in a resin mold body formed in a substantially annular shape. For example, when the coils are connected by the star connection method, a plurality of bus bars for supplying power to the coils of each phase and a bus bar forming a neutral point (common) are embedded in the resin mold body. ing.

ここで、各相のコイルに給電を行うための複数のバスバーは、それぞれ対応する相のコイルの一方の端末部が接続されることになるので、金属板からプレス加工等によって平面視略C状に打ち抜くことで形成される。これに対し、中性点を成すバスバーは、各相のコイルの他方の端末部が全て接続されることになるので、金属板からプレス加工等によって略円環状に打ち抜くことで形成される。
このように構成されたバスバーユニットは、このうちの給電を行うための複数のバスバーと、外部電源とを電気的に接続することで、各相のコイルに給電を行う(例えば、特許文献1参照)。 The bus bar unit configured in this way supplies power to the coils of each phase by electrically connecting a plurality of bus bars for supplying power to an external power source (see, for example, Patent Document 1). ). Here, since a plurality of bus bars for supplying power to the coils of each phase are connected to one end portion of the corresponding phase coil, they are substantially C-shaped in plan view by pressing from a metal plate. It is formed by punching. On the other hand, the bus bar forming the neutral point is connected to all the other end portions of the coils of the respective phases, and thus is formed by punching out from a metal plate into a substantially annular shape by pressing or the like. Here, since a plurality of bus bars for supplying power to the generating of each phase are connected to one end portion of the corresponding phase coil, they are substantially C-shaped in plan view by pressing from a metal plate. It is formed by punching On the other hand, the bus bar forming the neutral point is connected to all the other end portions of the generating of the respective phases, and thus is formed by punching out from a metal plate into a substantially annular shape by pressing or the like ..
The bus bar unit configured in this manner supplies power to the coils of each phase by electrically connecting a plurality of bus bars for supplying power and an external power source (for example, see Patent Document 1). ). The bus bar unit configured in this manner supplies power to the generating of each phase by efficiently connecting a plurality of bus bars for supplying power and an external power source (for example, see Patent Document 1).).

特開2008−79467号公報JP 2008-79467 A

しかしながら、上述の従来技術にあっては、中性点を成すバスバーが略円環状に形成されているので、金属板の使用されない部分が多くなり、歩留まりが悪くなってしまう。このため、製造コストが増大してしまうという課題がある。   However, in the above-described prior art, since the bus bar forming the neutral point is formed in a substantially annular shape, the portion where the metal plate is not used increases and the yield is deteriorated. For this reason, there exists a subject that manufacturing cost will increase.

そこで、この発明は、上述した事情に鑑みてなされたものであって、バスバーユニットを製造するにあたって、バスバーの製作歩留まりを向上させ、製造コストを低減することができるブラシレスモータを提供するものである。   Accordingly, the present invention has been made in view of the above-described circumstances, and provides a brushless motor capable of improving the production yield of a bus bar and reducing the production cost when producing a bus bar unit. .

上記の課題を解決するために、請求項1に記載した発明は、複数の相のコイルが巻装されたステータと、前記ステータに対して回転自在に設けられたロータと、各相のコイルに給電するためのバスバーユニットとを備え、前記バスバーユニットは、樹脂モールド体に、相毎に設けられ各々相のコイルに給電を行うための複数の相用バスバーと、中性点を成す環状の中性点用バスバーとをそれぞれ積層し、これら複数の相用バスバーと中性点用バスバーとが互いに絶縁した状態で埋設されて成るブラシレスモータであって、前記中性点用バスバーは、それぞれ対応する前記複数の相のコイルの巻き終わり端部に対応する位置に、前記複数の相と同じ数の中性点用端子が設けられるよう、周方向に分割された複数の中性片から成り、各中性片には、それぞれ周方向に隣り合う前記中性片同士を接続するための接続部が設けられ、前記樹脂モールド体は、前記中性片をそれぞれ接続されていない状態で樹脂モールドされて形成され、前記樹脂モールド体には、それぞれ周方向に隣り合う前記中性片同士を接続する前記接続部に対応する部位に、前記接続部を露出させるための接続用窓が形成されていることを特徴とする。
このように構成することで、中性点用バスバーを製造するにあたって、従来のように金属板から略円環状に打ち抜く必要がなく、周方向に分割された各中性片を打ち抜けばよくなる。 With this configuration, in manufacturing a bus bar for a neutral point, it is not necessary to punch out a metal plate in a substantially annular shape as in the conventional case, and it is sufficient to punch out each neutral piece divided in the circumferential direction. このため、金属板の使用されない部分が減少し、歩留まりが向上する。 Therefore, the unused portion of the metal plate is reduced, and the yield is improved. よって、製造コストを低減することができる。 Therefore, the manufacturing cost can be reduced.
また、樹脂モールド体に各接続片を埋設した後に各接続部を溶接等によって接続することができる。 Further, after each connection piece is embedded in the resin molded body, each connection portion can be connected by welding or the like. このため、バスバーユニットの組み立て作業性を向上させることができると共に、中性点用バスバーを単体で形成する場合と比較して余分な治具等を用意する必要がなく、製造コストの増大を抑制することができる。 Therefore, it is possible to improve the assembling workability of the bus bar unit, and it is not necessary to prepare an extra jig or the like as compared with the case where the bus bar for the neutral point is formed by itself, and the increase in the manufacturing cost is suppressed. can do. In order to solve the above-described problems, the invention described in claim 1 includes a stator in which coils of a plurality of phases are wound, a rotor provided rotatably with respect to the stator, and coils of each phase. A bus bar unit for supplying power, and the bus bar unit is provided in the resin mold body for each phase, and a plurality of phase bus bars for supplying power to the coils of each phase, and a ring-shaped center that forms a neutral point. A brushless motor in which a plurality of phase point bus bars and a plurality of phase point bus bars and a neutral point bus bar are embedded in a state of being insulated from each other, the neutral point bus bars corresponding to each other. It consists of a plurality of neutral pieces divided in the circumferential direction so that the same number of neutral point terminals as the plurality of phases are provided at positions corresponding to the winding end ends of the coils of the plurality of phases , For neut In order to solve the above-described problems, the invention described in claim 1 includes a stator in which efficiently of a plurality of phases are wound, a rotor provided rotatably with respect to the stator, and efficiently of each phase. A bus bar unit for supplying power, and the bus bar unit is provided in the resin mold body for each phase, and a plurality of phase bus bars for supplying power to the generating of each phase, and a ring-shaped center that forms a neutral point. brushless motor in which a plurality of phase point bus bars and a plurality of phase point bus bars and a neutral point bus bar are embedded in a state of being insulated from each other, the neutral point bus bars corresponding to each other. It consists of a plurality of neutral pieces divided in the traveling direction so that the same number of neutral point terminals as the plurality of phases are provided at positions corresponding to the winding end ends of the generating of the plurality of phases , For neut ral pieces Connection portion for connecting the neutral pieces are adjacent to each other in the circumferential direction are respectively provided, the resin molded body is formed by resin molding the neutral piece in a state of not being connected, the resin molding The body is characterized in that a connection window for exposing the connection portion is formed at a portion corresponding to the connection portion connecting the neutral pieces adjacent to each other in the circumferential direction . ral pieces Connection portion for connecting the neutral pieces are adjacent to each other in the delivering direction are respectively provided, the resin molded body is formed by resin molding the neutral piece in a state of not being connected, the resin molding The body is characterized in that a connection window for exposing the connection portion is formed at a portion corresponding to the connection portion connecting the neutral pieces adjacent to each other in the resin direction .
With this configuration, when manufacturing the neutral point bus bar, it is not necessary to punch out from the metal plate in a substantially annular shape as in the prior art, and it is only necessary to punch through the neutral pieces divided in the circumferential direction. For this reason, the unused part of the metal plate is reduced and the yield is improved. Therefore, the manufacturing cost can be reduced. With this configuration, when manufacturing the neutral point bus bar, it is not necessary to punch out from the metal plate in a substantially annular shape as in the prior art, and it is only necessary to punch through the neutral pieces divided in the originating direction For this reason, the unused part of the metal plate is reduced and the yield is improved. Therefore, the manufacturing cost can be reduced.
Moreover, each connection part can be connected by welding etc. after embedding each connection piece in the resin mold body. As a result, the assembly workability of the bus bar unit can be improved, and there is no need to prepare extra jigs compared to the case where the neutral point bus bar is formed as a single unit, thereby suppressing an increase in manufacturing cost. can do. Moreover, each connection part can be connected by welding etc. after embedding each connection piece in the resin mold body. As a result, the assembly workability of the bus bar unit can be improved, and there is no need to prepare extra jigs compared to the case where the neutral point bus bar is formed as a single unit, thereby suppressing an increase in manufacturing cost. Can do.

請求項2に記載した発明は、前記接続部は、軸方向に沿うように曲折形成され、それぞれ隣り合う前記中性片同士の前記接続部を重ね合わせた状態で溶接接続されることを特徴とする。 The invention described in claim 2 is characterized in that the connection portion is formed to be bent along the axial direction and welded in a state where the connection portions of the adjacent neutral pieces are overlapped. To do.

請求項3に記載した発明は、前記複数の相のコイルは、3相のコイルに構成されており、
前記中性点用バスバーは、3つの前記中性片で構成されていることを特徴とする。

ここで、金属板から中性片を打ち抜いた後に、各中性片の接続部を接続して中性点用バスバーを形成すると、各接続部に抵抗が生じることになる。 Here, if the neutral pieces are punched out from the metal plate and then the connecting portions of the neutral pieces are connected to form a bus bar for the neutral point, resistance is generated in each connecting portion. このため、相の数、つまり、3相に応じて中性点用バスバーを3つの中性片で構成することにより、各相のコイル間の抵抗値をそれぞれ同一の値に設定することが可能になる。 Therefore, it is possible to set the resistance value between the coils of each phase to the same value by configuring the bus bar for the neutral point with three neutral pieces according to the number of phases, that is, the three phases. become. よって、各相のコイルで磁力差が生じてしまうことを防止でき、ブラシレスモータの性能特性の低下を防止することができる。 Therefore, it is possible to prevent a magnetic force difference from occurring in the coils of each phase, and it is possible to prevent deterioration of the performance characteristics of the brushless motor. According to a third aspect of the present invention, the plurality of phase coils are configured as a three-phase coil, According to a third aspect of the present invention, the plurality of phase efficiently are configured as a three-phase coil,
The neutral point bus bar is composed of three neutral pieces. The neutral point bus bar is composed of three neutral pieces.
Here, if the neutral piece bus bar is formed by connecting the connection portions of the neutral pieces after the neutral pieces are punched from the metal plate, resistance is generated at the connection portions. For this reason, it is possible to set the resistance value between the coils of each phase to the same value by configuring the neutral point bus bar with three neutral pieces according to the number of phases, that is, the three phases. become. Therefore, it is possible to prevent a magnetic force difference from occurring in the coils of each phase, and it is possible to prevent the performance characteristics of the brushless motor from being deteriorated. Here, if the neutral piece bus bar is formed by connecting the connection portions of the neutral pieces after the neutral pieces are punched from the metal plate, resistance is generated at the connection portions. For this reason, it is possible to set the resistance value between the particularly of each phase to the same value by configuring the neutral point bus bar with three neutral pieces according to the number of phases, that is, the three phases. Become. Therefore, it is possible to prevent a magnetic force difference from occurring. in the poor of each phase, and it is possible to prevent the performance characteristics of the brushless motor from being deteriorated.

請求項4に記載した発明は、それぞれ隣り合う前記中性片を接続する前記接続部、および前記接続用窓の位置を前記樹脂モールド体の軸方向端面に設定し、前記接続用窓の近傍に、軸方向に沿って立ち上がる壁を設けたことを特徴とする。
このように構成することで、接続用窓から露出した接続部と、この接続部の周囲に存在する導電性の部材、例えば、コイルとの接触を壁によって阻止することができる。 With such a configuration, the contact between the connecting portion exposed from the connecting window and the conductive member existing around the connecting portion, for example, the coil can be prevented by the wall. このため、信頼性の高いブラシレスモータを提供することができる。 Therefore, a highly reliable brushless motor can be provided. In the invention described in claim 4, the position of the connection portion that connects the adjacent neutral pieces and the connection window are set on the axial end surface of the resin mold body, and is located in the vicinity of the connection window. A wall that rises in the axial direction is provided. In the invention described in claim 4, the position of the connection portion that connects the adjacent neutral pieces and the connection window are set on the axial end surface of the resin mold body, and is located in the vicinity of the connection window. A wall that rises in the axial direction is provided.
By comprising in this way, contact with the connection part exposed from the window for connection and the electroconductive member which exists around this connection part, for example, a coil, can be blocked | prevented by a wall. For this reason, a highly reliable brushless motor can be provided. By comprising in this way, contact with the connection part exposed from the window for connection and the electroconductive member which exists around this connection part, for example, a coil, can be blocked | prevented by a wall. For this reason, a highly reliable brushless motor can be provided.

本発明によれば、中性点用バスバーを製造するにあたって、従来のように金属板から略円環状に打ち抜く必要がなく、周方向に分割された各中性片を打ち抜けばよくなる。このため、金属板の使用されない部分が減少し、歩留まりが向上する。よって、製造コストを低減することができる。   According to the present invention, when manufacturing a neutral point bus bar, it is not necessary to punch out a substantially annular shape from a metal plate as in the prior art, and it is only necessary to punch out each neutral piece divided in the circumferential direction. For this reason, the unused part of the metal plate is reduced and the yield is improved. Therefore, the manufacturing cost can be reduced.

本発明の実施形態におけるブラシレスモータの断面斜視図である。 It is a section perspective view of a brushless motor in an embodiment of the present invention. 本発明の実施形態におけるステータコアの斜視図であるである。 It is a perspective view of the stator core in the embodiment of the present invention. 本発明の実施形態におけるバスバーユニットの斜視図である。 It is a perspective view of the bus-bar unit in the embodiment of the present invention. 本発明の実施形態におけるバスバーユニットの斜視図である。 It is a perspective view of the bus-bar unit in the embodiment of the present invention. 本発明の実施形態における各相のバスバーと中性点用バスバーとの積層状態を示す斜視図である。 It is a perspective view which shows the lamination | stacking state of the bus bar of each phase and the bus bar for neutral points in embodiment of this invention. 本発明の実施形態における各相のバスバーと中性点用バスバーとの積層状態を示す斜視図である。 It is a perspective view which shows the lamination | stacking state of the bus bar of each phase and the bus bar for neutral points in embodiment of this invention. 本発明の実施形態におけるバスバー片の斜視図である。 It is a perspective view of the bus-bar piece in embodiment of this invention. 本発明の実施形態におけるコイルの結線図状態を示す説明図である。 It is explanatory drawing which shows the connection diagram state of the coil in embodiment of this invention.

(ブラシレスモータ)
次に、この発明の実施形態を図面に基づいて説明する。
図1は、ブラシレスモータ1の断面斜視図、図2は、ステータコア12の斜視図である。
図1、図2に示すように、ブラシレスモータ1は、例えば、電動パワーステアリング装置(EPS;Electric Power Steering)に用いられるものであって、ステータ2と、ステータ2内に配置されたロータ3とを有し、ステータ2に固定されたブラケット4にロータ3が回転自在に支持されている。
(Brushless motor)
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional perspective view of the brushless motor 1, and FIG. 2 is a perspective view of the stator core 12.
As shown in FIGS. 1 and 2, the brushless motor 1 is used in, for example, an electric power steering device (EPS), and includes a stator 2 and a rotor 3 disposed in the stator 2. The rotor 3 is rotatably supported by a bracket 4 fixed to the stator 2. As shown in FIGS. 1 and 2, the brushless motor 1 is used in, for example, an electric power steering device (EPS), and includes a stator 2 and a rotor 3 disposed in the stator 2. The rotor 3 is rotatably supported by a bracket 4 fixed to the rotor 2.

ロータ3は、内部に不図示のラック軸が挿入可能である。ラック軸は、ギヤボックス内でラック・アンド・ピニオン機構を形成し、ステアリングホイールの操作に応じてブラシレスモータ1の軸方向に移動自在になっている。ラック軸の両端は、ナックルアームなどを介して車両の車輪に連結されている。   A rotor shaft (not shown) can be inserted into the rotor 3. The rack shaft forms a rack and pinion mechanism in the gear box, and is movable in the axial direction of the brushless motor 1 in accordance with the operation of the steering wheel. Both ends of the rack shaft are connected to the wheels of the vehicle via a knuckle arm or the like.

ステータ2は、略円筒形のステータハウジング11の内周に、ステータコア12が焼き嵌め固定されている。ステータハウジング11は、解放された両端部のそれぞれの周縁部にボルト孔13が形成されており、ブラケット4や、不図示の他のブラケットを固定できる。ブラケット4側の端部は、ブラケット4と印籠接合する際に使用されるインロー部11Aが形成されている。   In the stator 2, a stator core 12 is fixed by shrinkage fitting on the inner periphery of a substantially cylindrical stator housing 11. The stator housing 11 has bolt holes 13 formed at the respective peripheral edge portions of the released both ends, and the bracket 4 and other brackets (not shown) can be fixed. An end portion on the side of the bracket 4 is formed with an inlay portion 11 </ b> A used when the stamper is joined to the bracket 4.

ステータコア12は、環状の外周部31から径方向中央に向かってコイル16を巻装するための複数(この実施形態では9つ)のティース14が延設されている。ステータコア12の内周側には、隣接するティース14間に蟻溝状のスロット40が複数(この実施形態では9つ)形成されている。各ティース14には、インシュレータ15を装着した上からコイル16が所謂集中巻き方式にて巻回されている。各コイル16の巻き始め端部45A、および巻き終わり端部45Bは、ブラケット4とは反対側に引き出されている。   The stator core 12 is provided with a plurality of (in this embodiment, nine) teeth 14 extending from the annular outer peripheral portion 31 toward the center in the radial direction. A plurality of dovetail-shaped slots 40 (9 in this embodiment) are formed between adjacent teeth 14 on the inner peripheral side of the stator core 12. A coil 16 is wound around each tooth 14 by a so-called concentrated winding method after the insulator 15 is mounted. The winding start end 45 </ b> A and the winding end end 45 </ b> B of each coil 16 are drawn out to the side opposite to the bracket 4.

インシュレータ15の径方向外側には、軸方向に沿って立設されている外周壁71Aが形成されている。この外周壁71Aには、各コイル16の巻き始め端部45Aの引き出し位置に対応する部位に、巻き始め端用凹部72が形成されている。また、インシュレータ15の外周壁71Aには、巻き終わり端部45Bの引き出し位置に対応する部位に、巻き終わり端用凹部73が形成されている。   An outer peripheral wall 71 </ b> A that is erected along the axial direction is formed on the radially outer side of the insulator 15. In the outer peripheral wall 71A, a winding start end recess 72 is formed at a portion corresponding to the drawing position of the winding start end 45A of each coil 16. Further, a winding end end recess 73 is formed in the outer peripheral wall 71A of the insulator 15 at a portion corresponding to the drawing position of the winding end end 45B.

コイル16は、周回り方向に沿ってU相、V相、W相の順に割り当てられている。すなわち、この実施形態のブラシレスモータ1は、U相、V相、W相の3相のコイル16を備えた3相ブラシレスモータとなっている。
なお、ステータコア12は、軸線に対してスキューさせてある。つまり、ティース14、およびスロット40が軸線に対して捩れるように形成されている。
また、ステータコア12は、周方向に分割して各々ティース14を有する複数のコアユニットを互いに接合して構成してもよいし、周方向に分割せずに一体形成としてもよい。 Further, the stator core 12 may be divided in the circumferential direction and a plurality of core units having teeth 14 may be joined to each other, or may be integrally formed without being divided in the circumferential direction. The coils 16 are assigned in the order of the U phase, the V phase, and the W phase along the circumferential direction. That is, the brushless motor 1 of this embodiment is a three-phase brushless motor including a three-phase coil 16 of U phase, V phase, and W phase. That is, the brushless motor 1 of this embodiment is a three-phase brushless motor including a three-phase coil 16 are assigned in the order of the U phase, the V phase, and the W phase along the reasoning direction. of U phase, V phase, and W phase.
The stator core 12 is skewed with respect to the axis. That is, the teeth 14 and the slot 40 are formed to be twisted with respect to the axis. The stator core 12 is skewed with respect to the axis. That is, the teeth 14 and the slot 40 are formed to be twisted with respect to the axis.
The stator core 12 may be configured by joining a plurality of core units each having teeth 14 divided in the circumferential direction, or may be integrally formed without being divided in the circumferential direction. The stator core 12 may be configured by joining a plurality of core units each having teeth 14 divided in the distributing direction, or may be formed without being divided in the generating direction.

ブラケット4は略円筒形状に形成されており、ステータハウジング11にボルト(不図示)によって締結固定されている。ブラケット4の端部には、ステータハウジング11に突き当てたときにインロー部11Aに嵌合する接合部4Aが設けられている。この接合部4Aの外周に刻まれた溝に、Oリングなどのパッキン23が装着されている。ブラケット4の他方の端部は、ラック軸を挿入可能に開口している。ブラケット4内には、開口側にベアリング25が圧入されている。   The bracket 4 is formed in a substantially cylindrical shape, and is fastened and fixed to the stator housing 11 with bolts (not shown). At the end portion of the bracket 4, a joint portion 4 </ b> A that fits into the spigot portion 11 </ b> A when abutted against the stator housing 11 is provided. A packing 23 such as an O-ring is mounted in a groove formed on the outer periphery of the joint 4A. The other end of the bracket 4 opens so that the rack shaft can be inserted. A bearing 25 is press-fitted into the bracket 4 on the opening side.

ベアリング25よりもステータ2側には、レゾルバステータ26Aが固定されている。レゾルバステータ26Aは、ロータ3の回転位置を検出するレゾルバ26の一方を構成している。ブラケット4の外周部には、レゾルバステータ26Aからの電気信号を取り出すためのセンサコネクタ27が固定されている。   A resolver stator 26A is fixed to the stator 2 side of the bearing 25. The resolver stator 26 </ b> A constitutes one of the resolvers 26 that detects the rotational position of the rotor 3. A sensor connector 27 for taking out an electrical signal from the resolver stator 26A is fixed to the outer peripheral portion of the bracket 4.

レゾルバステータ26Aは、磁性材料からなるプレートを積層して構成されたコア41を有し、コア41の径方向内側に向かってティース(不図示)が延設されている。ティースは、周方向で等間隔に配置されている。各ティースには、インシュレータ53を装着した上からレゾルバコイル(不図示)が巻装されている。各レゾルバコイルの巻線の端部は、インシュレータ53の一部を突出させて形成した端子保持部55に引き出されている。   The resolver stator 26 </ b> A has a core 41 configured by laminating plates made of a magnetic material, and teeth (not shown) extend inward in the radial direction of the core 41. The teeth are arranged at equal intervals in the circumferential direction. A resolver coil (not shown) is wound around each tooth after the insulator 53 is mounted. The end of the winding of each resolver coil is drawn out to a terminal holding portion 55 formed by protruding a part of the insulator 53.

端子保持部55には、レゾルバコイルの巻線の端部の数に合わせてハーネス接続端子56が一体成形されている。各ハーネス接続端子56には、レゾルバコイルの巻線の端部が1つずつ固定されている。レゾルバステータ26Aは、ハーネス接続端子56とレゾルバコイルの端部の接続箇所、およびレゾルバコイルの全体を覆うように樹脂でコーティングしてあり、接続箇所、および巻線を保護している。   A harness connection terminal 56 is integrally formed in the terminal holding portion 55 in accordance with the number of winding ends of the resolver coil. One end of the winding of the resolver coil is fixed to each harness connection terminal 56 one by one. The resolver stator 26A is coated with a resin so as to cover the connection portion between the harness connection terminal 56 and the end of the resolver coil and the entire resolver coil, and protects the connection portion and the winding.

センサコネクタ27は、一端部に信号ケーブルを嵌合可能な受け部61を有し、他端部がブラケット4内に挿入されている。また、他端部側の外周にブラケット4の外面に密着させるツバ部62が延設されている。このツバ部62を介してブラケット4にボルト5が螺入されることにより、センサコネクタ27をブラケット4に締結固定する。さらに、センサコネクタ27には、一端部から他端部に貫通するコネクタ端子63が一体成形されている。各コネクタ端子63の他端(レゾルバステータ26A側端)は、ハーネス接続端子56の配置に合わせて配列されており、それぞれハーネス接続端子56に接続されている。   The sensor connector 27 has a receiving portion 61 into which a signal cable can be fitted at one end, and the other end is inserted into the bracket 4. In addition, a flange portion 62 that extends in close contact with the outer surface of the bracket 4 is provided on the outer periphery on the other end side. The sensor connector 27 is fastened and fixed to the bracket 4 by screwing the bolt 5 into the bracket 4 via the flange 62. Further, the sensor connector 27 is integrally formed with a connector terminal 63 penetrating from one end to the other end. The other end (resolver stator 26 </ b> A side end) of each connector terminal 63 is arranged in accordance with the arrangement of the harness connection terminals 56 and is connected to the harness connection terminals 56.

ロータ3は、中空シャフトからなる回転軸22を有する。回転軸22の一方の端部がブラケット4に圧入されたベアリング25に軸支されている。一方の端部側の外周には、レゾルバ26の他方を構成するレゾルバロータ26Bが固定されている。レゾルバロータ26Bは、永久磁石を周方向に磁極が交互に並ぶように配置した構成を有する。さらに、回転軸22の外周で、ステータコア12に臨む位置には、ロータマグネット33が金属プレートの積層体32を介してブラケット34によって固定されている。ロータマグネット33は、環状の永久磁石からなるものであって、複数の磁極が周方向に配置されている。   The rotor 3 has a rotating shaft 22 formed of a hollow shaft. One end of the rotary shaft 22 is pivotally supported by a bearing 25 press-fitted into the bracket 4. A resolver rotor 26 </ b> B constituting the other of the resolver 26 is fixed to the outer periphery on the one end side. The resolver rotor 26B has a configuration in which permanent magnets are arranged so that magnetic poles are alternately arranged in the circumferential direction. Further, a rotor magnet 33 is fixed by a bracket 34 via a metal plate laminate 32 at a position facing the stator core 12 on the outer periphery of the rotating shaft 22. The rotor magnet 33 is made of an annular permanent magnet, and a plurality of magnetic poles are arranged in the circumferential direction.

なお、回転軸22の端部には、不図示のボールナットが固定される。このボールナットは、ラック軸の一部に形成されているボールネジとの間に複数のボールを介在させることでボールナット機構を構成する。ボールナットは、ステータハウジング11に固定される不図示のブラケットに設けられたベアリングに回転自在に支持される。   A ball nut (not shown) is fixed to the end of the rotating shaft 22. This ball nut constitutes a ball nut mechanism by interposing a plurality of balls with a ball screw formed on a part of the rack shaft. The ball nut is rotatably supported by a bearing provided on a bracket (not shown) fixed to the stator housing 11.

ここで、各コイル16の巻き始め端部45A、および巻き終わり端部45Bは、それぞれバスバーユニット17に接続されている。バスバーユニット17は、ステータハウジング11のブラケットとは反対側であって回転軸22の周囲を取り囲むように配置され、ステータハウジング11の外周部に突設された電源コネクタ18に接続されている。
電源コネクタ18の一端部には、不図示の外部電源に一端部が接続されている電源ケーブル(不図示)の他端部を嵌着するための受け部19が一体成形されており、外部電源から電流をバスバーユニット17に供給できるようになっている。 A receiving portion 19 for fitting the other end of a power cable (not shown) to which one end is connected to an external power supply (not shown) is integrally molded at one end of the power connector 18. The electric current can be supplied to the bus bar unit 17 from the above. Here, the winding start end 45A and the winding end end 45B of each coil 16 are connected to the bus bar unit 17, respectively. The bus bar unit 17 is disposed on the opposite side of the stator housing 11 from the bracket and surrounds the periphery of the rotary shaft 22, and is connected to a power connector 18 projecting from the outer peripheral portion of the stator housing 11. Here, the winding start end 45A and the winding end end 45B of each coil 16 are connected to the bus bar unit 17, respectively. The bus bar unit 17 is disposed on the opposite side of the stator housing 11 from the bracket and surrounds the ferrite of the rotary shaft 22, and is connected to a power connector 18 projecting from the outer peripheral portion of the stator housing 11.
A receiving portion 19 for fitting the other end of a power cable (not shown) having one end connected to an external power supply (not shown) is integrally formed at one end of the power connector 18. Current can be supplied to the bus bar unit 17. A receiving portion 19 for fitting the other end of a power cable (not shown) having one end connected to an external power supply (not shown) is formed at one end of the power connector 18. Current can be supplied to the bus bar unit 17.

また、電源コネクタ18の他端側には、外周にステータハウジング11の外面に密着させるツバ部20が延設されている。このツバ部20を介してステータハウジング11にボルト21を螺入することにより、電源コネクタ18をステータハウジング11に締結固定する。
さらに、電源コネクタ18には、一端部から他端部に貫通するコネクタ端子64が一体成形されている。 Further, the power connector 18 is integrally molded with a connector terminal 64 penetrating from one end to the other. 各コネクタ端子64の他端(バスバーユニット17側端)には、後述するバスバーユニット17の給電部52U,52V,52Wが接続される。 The power feeding units 52U, 52V, 52W of the bus bar unit 17, which will be described later, are connected to the other end (end on the bus bar unit 17 side) of each connector terminal 64. Further, on the other end side of the power connector 18, a flange portion 20 that extends in close contact with the outer surface of the stator housing 11 is extended. The power connector 18 is fastened and fixed to the stator housing 11 by screwing bolts 21 into the stator housing 11 via the flanges 20. Further, on the other end side of the power connector 18, a flange portion 20 that extends in close contact with the outer surface of the tetrahydrofuran housing 11 is extended. The power connector 18 is fastened and fixed to the stator housing 11 by screwing bolts 21 into the stator housing 11 via the flanges 20.
Further, the power connector 18 is integrally formed with a connector terminal 64 penetrating from one end to the other end. The other end (the bus bar unit 17 side end) of each connector terminal 64 is connected to power supply portions 52U, 52V, and 52W of the bus bar unit 17 described later. Further, the power connector 18 is formed with a connector terminal 64 penetrating from one end to the other end. The other end (the bus bar unit 17 side end) of each connector terminal 64 is connected to power supply portions 52U, 52V, and 52W of the bus bar unit 17 described later.

(バスバーユニット)
図3は、バスバーユニット17を軸方向外側からみた斜視図、図4は、バスバーユニット17をステータコア12側からみた斜視図である。
図3、図4に示すように、バスバーユニット17は各相のコイル16をスター結線方式にて結線すると共に、各相のコイル16に給電を行うためのものである。バスバーユニット17は、回転軸22を挿通可能な略円環状に形成された樹脂モールド体46を有している。
(Bus bar unit)
FIG. 3 is a perspective view of the bus bar unit 17 as viewed from the outside in the axial direction, and FIG. 4 is a perspective view of the bus bar unit 17 as viewed from the stator core 12 side.
As shown in FIGS. 3 and 4, the bus bar unit 17 connects the coils 16 of each phase by a star connection method and supplies power to the coils 16 of each phase. The bus bar unit 17 has a resin mold body 46 formed in a substantially annular shape through which the rotary shaft 22 can be inserted. As shown in FIGS. 3 and 4, the bus bar unit 17 connects the utilizing 16 of each phase by a star connection method and supplies power to the communicating 16 of each phase. The bus bar unit 17 has a resin mold body 46 formed in a substantially annular shape through which the rotary shaft 22 can be inserted.

樹脂モールド体46の外周面46Aには、ステータコア12側に向かって突出する複数の脚部44が周方向に沿って等間隔に一体成形されている。この脚部44は、バスバーユニット17の位置決めを行うためのものであって、ステータコア12のインシュレータ15上に載置可能に形成されている。   A plurality of leg portions 44 projecting toward the stator core 12 side are integrally formed on the outer peripheral surface 46A of the resin mold body 46 at equal intervals along the circumferential direction. The leg portion 44 is for positioning the bus bar unit 17 and is formed so as to be placed on the insulator 15 of the stator core 12.

ここで、インシュレータ15には、脚部44に対応する部位に、脚部44を嵌合可能な凹部77が形成されている。この凹部77に脚部44を嵌合させることによって、バスバーユニット17の位置決めが行われるようになっている。
また、樹脂モールド体46には、コイル16の相毎に設けられたU相用バスバー47U、V相用バスバー47V、およびW相用バスバー47Wと、中性点用バスバー48とが積層された状態で、かつ互いに絶縁された状態で埋設されている。
Here, the insulator 15 is formed with a recess 77 into which the leg portion 44 can be fitted at a portion corresponding to the leg portion 44. The bus bar unit 17 is positioned by fitting the leg portion 44 to the recess 77.
The resin mold body 46 is formed by stacking a U-phase bus bar 47U, a V-phase bus bar 47V, and a W-phase bus bar 47W provided for each phase of the coil 16, and a neutral point bus bar 48. And embedded in an insulated state. The resin mold body 46 is formed by stacking a U-phase bus bar 47U, a V-phase bus bar 47V, and a W-phase bus bar 47W provided for each phase of the coil 16, and a neutral point bus bar 48. And embedded in an insulated state.

図5、図6は、各相のバスバー47U,47V,47Wと、中性点用バスバー48との積層状態を示し、図5は軸方向外側からみた斜視図、図6はステータコア12側からみた斜視図である。
図5、図6に示すように、各相用バスバー47U,47V,47Wは、金属板からプレス加工等によって打ち抜かれ、樹脂モールド体46の形状に対応するように略円弧状(略C字状)に形成されている。 As shown in FIGS. 5 and 6, each of the phase bus bars 47U, 47V, 47W is punched from a metal plate by press working or the like, and has a substantially arc shape (substantially C shape) so as to correspond to the shape of the resin mold body 46. ) Is formed. 5 and 6 show the stacked state of the bus bars 47U, 47V and 47W of each phase and the neutral point bus bar 48, FIG. 5 is a perspective view seen from the outside in the axial direction, and FIG. 6 is seen from the stator core 12 side. It is a perspective view. 5 and 6 show the stacked state of the bus bars 47U, 47V and 47W of each phase and the neutral point bus bar 48, FIG. 5 is a perspective view seen from the outside in the axial direction, and FIG. 6 is seen from the stator core 12 side. It is a perspective view.
As shown in FIGS. 5 and 6, each phase bus bar 47 </ b> U, 47 </ b> V, 47 </ b> W is punched from a metal plate by pressing or the like, and is substantially arc-shaped (substantially C-shaped) so as to correspond to the shape of the resin mold body 46. ). As shown in FIGS. 5 and 6, each phase bus bar 47 </ b> U, 47 </ b> V, 47 </ b> W is punched from a metal plate by pressing or the like, and is substantially arc- shaped (substantially C-shaped) so as to correspond to the shape of the resin mold body 46.).

U相用バスバー47Uには、U相のコイル16の巻き始め端部45Aに対応する位置に、複数(この実施形態では3つ)のU相用端子49Uが径方向外側に向かって突設されている。V相用バスバー47Vには、V相のコイル16の巻き始め端部45Aに対応する位置に、複数(この実施形態では3つ)のV相用端子49Vが径方向外側に向かって突設されている。W相用バスバー47Wには、W相のコイル16の巻き始め端部45Aに対応する位置に、複数(この実施形態では3つ)のW相用端子49Wが径方向外側に向かって突設されている。   On the U-phase bus bar 47U, a plurality (three in this embodiment) of U-phase terminals 49U project outward in the radial direction at positions corresponding to the winding start ends 45A of the U-phase coil 16. ing. On the V-phase bus bar 47V, a plurality (three in this embodiment) of V-phase terminals 49V project outward in the radial direction at positions corresponding to the winding start ends 45A of the V-phase coil 16. ing. On the W-phase bus bar 47W, a plurality (three in this embodiment) of W-phase terminals 49W project radially outward at positions corresponding to the winding start end 45A of the W-phase coil 16. ing.

各相用端子49U,49V,49Wは、樹脂モールド体46の外周面46Aから径方向外側に向かって突出した状態になっている。したがって、それぞれ相用バスバー47U,47V,47Wを積層すると、樹脂モールド体46の外周面46Aに周回り方向に沿ってU相用端子49U、V相用端子49V、W相用端子49Wがこの順で突出した状態になる。
また、インシュレータ15の外周壁71Aには、各コイル16の巻き始め端部45Aの引き出し位置に対応する部位に巻き始め端用凹部72が形成されていることから、各相用端子49U,49V,49Wは、巻き始め端用凹部72に近接配置されていることになる。 Further, since the winding start end recess 72 is formed on the outer peripheral wall 71A of the insulator 15 at a portion corresponding to the drawing position of the winding start end portion 45A of each coil 16, each phase terminal 49U, 49V, The 49W is arranged close to the winding start end recess 72. Each phase terminal 49 </ b> U, 49 </ b> V, 49 </ b> W is in a state of projecting radially outward from the outer peripheral surface 46 </ b> A of the resin mold body 46. Therefore, when the phase bus bars 47U, 47V, 47W are laminated, the U-phase terminal 49U, the V-phase terminal 49V, and the W-phase terminal 49W are arranged in this order along the circumferential direction on the outer peripheral surface 46A of the resin mold body 46. It will be in a protruding state. Each phase terminal 49 </ b> U, 49 </ b> V, 49 </ b> W is in a state of projecting projected outward from the outer peripheral surface 46 </ b> A of the resin mold body 46. Therefore , when the phase bus bars 47U, 47V, 47W are laminated, the U-phase terminal 49U, the V-phase terminal 49V, and the W-phase terminal 49W are arranged in this order along the projected direction on the outer peripheral surface 46A of the resin mold body 46. It will be in a projected state.
Further, since the outer peripheral wall 71A of the insulator 15 is provided with a winding start end recess 72 at a portion corresponding to the drawing position of the winding start end 45A of each coil 16, each phase terminal 49U, 49V, 49W is disposed close to the recess 72 for the winding start end. Further, since the outer peripheral wall 71A of the insulator 15 is provided with a winding start end recess 72 at a portion corresponding to the drawing position of the winding start end 45A of each coil 16, each phase terminal 49U, 49V, 49W is disposed close to the recess 72 for the winding start end.

さらに、各相用端子49U,49V,49Wの先端には、それぞれ二又状に設けられた1対の舌片部51,51が一体成形されており、これら舌片部51,51により各相のコイル16の巻き始め端部45Aを挟持可能になっている。
さらに、各相用バスバー47U,47V,47Wには、径方向内側に給電部52U,52V,52Wが一体成形されている。 Further, the power feeding portions 52U, 52V, 52W are integrally molded inside the bus bars 47U, 47V, 47W for each phase in the radial direction. Further, a pair of tongue pieces 51, 51 provided in a bifurcated shape are integrally formed at the tips of the phase terminals 49U, 49V, 49W, respectively. The winding start end portion 45A of the coil 16 can be clamped. Further, a pair of tongue pieces 51, 51 provided in a bifurcated shape are therefore formed at the tips of the phase terminals 49U, 49V, 49W, respectively. The winding start end portion 45A of the coil 16 can be clamped.
Furthermore, the power supply portions 52U, 52V, and 52W are integrally formed in each phase bus bar 47U, 47V, and 47W on the radially inner side. Furthermore, the power supply portions 52U, 52V, and 52W are formed in each phase bus bar 47U, 47V, and 47W on the sequentially inner side.

給電部52U,52V,52Wは、電源コネクタ18に接続される部位である。各給電部52U,52V,52Wは、それぞれ相用バスバー47U,47V,47Wの径方向内側から電源コネクタ18のコネクタ端子64に向かって軸方向に沿って屈曲延出した後、径方向外側に向かって屈曲延出している。各給電部52U,52V,52Wは、各相用バスバー47U,47V,47Wを積層した状態で互いに干渉しないように周方向にずれ、かつ電源コネクタ18のコネクタ端子64に対応する位置に配置されている。また、各給電部52U,52V,52Wのうち、径方向外側に向かって屈曲延出している先端部65U,65V,65Wは、それぞれ面一になっている。   The power feeding units 52U, 52V, and 52W are parts connected to the power connector 18. The power feeding portions 52U, 52V, and 52W are bent and extended along the axial direction from the radially inner side of the phase bus bars 47U, 47V, and 47W toward the connector terminal 64 of the power connector 18, and then toward the radially outer side. And bent over. The power feeding portions 52U, 52V, and 52W are shifted in the circumferential direction so as not to interfere with each other in a state where the bus bars for phases 47U, 47V, and 47W are stacked, and are disposed at positions corresponding to the connector terminals 64 of the power connector 18. Yes. In addition, among the power feeding portions 52U, 52V, and 52W, the tip portions 65U, 65V, and 65W that are bent and extended toward the radially outer side are flush with each other.

先端部65U,65V,65Wにはボルト孔67が形成されている一方、電源コネクタ18のコネクタ端子64にはボルト孔67に対応する位置にボルト孔(不図示)が形成されている。さらに、先端部65U,65V,65Wと樹脂モールド体46の一端面46Bとの間には、それぞれボルト座66が設けられている。そして、コネクタ端子64側からボルト68(図1参照)を挿通し、このボルト68をボルト座66に螺入することによって、電源コネクタ18のコネクタ端子64とバスバーユニット17の給電部52U,52V,52Wとが接続されるようになっている。
ここで、樹脂モールド体46には、各給電部52U,52V,52Wの周方向両側に対応する部位に、一端面46Bから立ち上がる壁部69が一体成形されている。 Here, in the resin molded body 46, a wall portion 69 rising from one end surface 46B is integrally molded at a portion corresponding to both sides of each of the feeding portions 52U, 52V, 52W in the circumferential direction. この壁部69は、各給電部52U,52V,52Wの絶縁を確保するためのものである。 The wall portion 69 is for ensuring insulation of each feeding portion 52U, 52V, 52W. Bolt holes 67 are formed in the tip portions 65U, 65V, 65W, while bolt holes (not shown) are formed in the connector terminals 64 of the power connector 18 at positions corresponding to the bolt holes 67. Further, bolt seats 66 are provided between the tip portions 65U, 65V, 65W and one end face 46B of the resin mold body 46, respectively. Then, a bolt 68 (see FIG. 1) is inserted from the connector terminal 64 side, and the bolt 68 is screwed into the bolt seat 66, whereby the power supply portions 52U, 52V, 52W is connected. Bolt holes 67 are formed in the tip portions 65U, 65V, 65W, while bolt holes (not shown) are formed in the connector terminals 64 of the power connector 18 at positions corresponding to the bolt holes 67. Further, bolt seats 66 are provided between the tip portions 65U, 65V, 65W and one end face 46B of the resin mold body 46, respectively. Then, a bolt 68 (see FIG. 1) is inserted from the connector terminal 64 side, and the bolt 68 is screwed into the bolt seat 66, respectively the power supply portions 52U, 52V, 52W is connected.
Here, in the resin mold body 46, wall portions 69 rising from one end face 46B are integrally formed at portions corresponding to both sides in the circumferential direction of the respective power feeding portions 52U, 52V, 52W. This wall portion 69 is for ensuring insulation of the power feeding portions 52U, 52V, and 52W. Here, in the resin mold body 46, wall portions 69 rising from one end face 46B are formed at portions corresponding to both sides in the conveying direction of the respective power feeding portions 52U, 52V, 52W. This wall portion 69 is for ensuring insulation of the power feeding portions 52U, 52V, and 52W.

中性点用バスバー48は、樹脂モールド体46の形状に対応するように略円環状に形成されたものであって、各相用バスバー47U,47V,47Wよりもステータコア12側、つまり、樹脂モールド体46の脚部44が突出している側に配置されている。
中性点用バスバー48には、各相のコイル16の巻き終わり端部45Bに対応する位置に、複数(この実施形態では9つ)の中性点用端子50が径方向外側に向かって突設されている。 In the neutral point bus bar 48, a plurality of (nine in this embodiment) neutral point terminals 50 project radially outward at positions corresponding to the winding end ends 45B of the coils 16 of each phase. It is installed. The neutral point bus bar 48 is formed in a substantially annular shape so as to correspond to the shape of the resin mold body 46, and is on the stator core 12 side of each phase bus bar 47 U, 47 V, 47 W, that is, the resin mold. The leg 46 of the body 46 is disposed on the side from which the leg 46 protrudes. The neutral point bus bar 48 is formed in a substantially annular shape so as to correspond to the shape of the resin mold body 46, and is on the stator core 12 side of each phase bus bar 47 U, 47 V, 47 W, that is, the resin mold. The leg 46 of the body 46 is disposed on the side from which the leg 46 depositeds.
In the neutral point bus bar 48, a plurality (9 in this embodiment) of neutral point terminals 50 project radially outward at positions corresponding to the winding end portions 45B of the coils 16 of the respective phases. It is installed. In the neutral point bus bar 48, a plurality (9 in this embodiment) of neutral point terminals 50 project particularly outward at positions corresponding to the winding end portions 45B of the similarly 16 of the respective phases. It is installed.

インシュレータ15の外周壁71Aには、各コイル16の巻き終わり端部45Bの引き出し位置に対応する部位に巻き終わり端用凹部73が形成されていることから、中性点用端子50は、巻き終わり端用凹部73に近接配置されていることになる。
中性点用端子50の先端には、二又状に設けられた1対の舌片部50A,50Aが一体成形されており、これら舌片部50A,50Aにより各相のコイル16の巻き終わり端部45Bを挟持可能になっている。 A pair of tongue pieces 50A and 50A provided in a bifurcated shape are integrally molded at the tip of the neutral point terminal 50, and the winding ends of the coils 16 of each phase are formed by these tongue pieces 50A and 50A. The end portion 45B can be sandwiched. Since the winding end end recess 73 is formed on the outer peripheral wall 71A of the insulator 15 at a portion corresponding to the drawing position of the winding end end 45B of each coil 16, the neutral point terminal 50 is connected to the end of winding. That is, it is disposed in proximity to the end recess 73. Since the winding end end recess 73 is formed on the outer peripheral wall 71A of the insulator 15 at a portion corresponding to the drawing position of the winding end end 45B of each coil 16, the neutral point terminal 50 is connected to the end of winding That is, it is disposed in proximity to the end recess 73.
A pair of tongue pieces 50A, 50A provided in a bifurcated shape are integrally formed at the tip of the neutral point terminal 50, and the winding ends of the coils 16 of the respective phases are formed by these tongue pieces 50A, 50A. The end 45B can be clamped. A pair of tongue pieces 50A, 50A provided in a bifurcated shape are formed at the tip of the neutral point terminal 50, and the winding ends of the communicating 16 of the respective phases are formed by these tongue pieces 50A, 50A. The end 45B can be clamped.

ここで、中性点用バスバー48は、3相のコイル16に対応するように、周方向に3分割されたバスバー片81を互いに接続することで成る。
図7は、バスバー片81の斜視図である。
図5〜図7に示すように、バスバー片81は、金属板からプレス加工等によって打ち抜かれたものであって、中性点用バスバー48を周方向に3分割したものであるから略円弧状に形成されている。 As shown in FIGS. 5 to 7, the bus bar piece 81 is punched from a metal plate by press working or the like, and the bus bar 48 for the neutral point is divided into three in the circumferential direction, and thus has a substantially arc shape. Is formed in. 3つのバスバー片81は、それぞれコイル16の相毎に対応している。 The three bus bar pieces 81 correspond to each phase of the coil 16. このため、各バスバー片81には、それぞれ対応する相のコイル16の巻き終わり端部45Bに対応する位置に、複数(この実施形態では3つ)の中性点用端子50が径方向外側に向かって突設されている。 Therefore, in each bus bar piece 81, a plurality of (three in this embodiment) neutral point terminals 50 are radially outward at positions corresponding to the winding end ends 45B of the coils 16 of the corresponding phases. It is thrust toward. Here, the neutral point bus bar 48 is formed by connecting bus bar pieces 81 divided into three in the circumferential direction so as to correspond to the three-phase coil 16. Here, the neutral point bus bar 48 is formed by connecting bus bar pieces 81 divided into three in the distributing direction so as to correspond to the three-phase coil 16.
FIG. 7 is a perspective view of the bus bar piece 81. FIG. 7 is a perspective view of the bus bar piece 81.
As shown in FIGS. 5 to 7, the bus bar piece 81 is punched from a metal plate by pressing or the like, and the neutral point bus bar 48 is divided into three in the circumferential direction. Is formed. The three bus bar pieces 81 correspond to the respective phases of the coils 16. For this reason, each bus bar piece 81 has a plurality (three in this embodiment) of neutral point terminals 50 radially outward at positions corresponding to the winding end portions 45B of the coils 16 of the corresponding phases. It protrudes toward you. As shown in FIGS. 5 to 7, the bus bar piece 81 is punched from a metal plate by pressing or the like, and the neutral point bus bar 48 is divided into three in the sintered direction. Is formed. The three bus bar pieces 81 correspond to the respective phases of the similarly 16. For this reason, each bus bar piece 81 has a plurality (three in this embodiment) of neutral point terminals 50 particularly outward at positions corresponding to the winding end portions 45B of the frequently 16 of the corresponding phases. It displayss toward you.

すなわち、バスバー片81は、U相のコイル16の巻き終わり端部45Bが接続されるU相用のバスバー片81Uと、V相のコイル16の巻き終わり端部45Bが接続されるV相用のバスバー片81Vと、W相のコイル16の巻き終わり端部45Bが接続されるW相用のバスバー片81Wとで構成されている。   In other words, the bus bar piece 81 has a U-phase bus bar piece 81U to which the winding end portion 45B of the U-phase coil 16 is connected and a V-phase winding portion to which the winding end end portion 45B of the V-phase coil 16 is connected. The bus bar piece 81 </ b> V and a W-phase bus bar piece 81 </ b> W to which the winding end 45 </ b> B of the W-phase coil 16 is connected.

また、バスバー片81の長手方向両端は、全体をステータコア12側(図6における下面側、図7における上面側)に向かって軸方向に沿うように曲折形成されており、ここを接続部として構成している。各バスバー片81の長手方向両端に形成された1対の接続部82,82は、周方向に隣り合うバスバー片81同士を接続するためのものである。各接続部82は、それぞれ周方向外側の面82Aを重ね合わせた状態で、例えば、TIG溶接等によって溶接接続される。これにより、略環状の中性点用バスバー48が形成される。   Further, both ends in the longitudinal direction of the bus bar piece 81 are bent so as to be along the axial direction toward the stator core 12 side (the lower surface side in FIG. 6 and the upper surface side in FIG. 7). doing. A pair of connection portions 82 and 82 formed at both ends in the longitudinal direction of each bus bar piece 81 are for connecting bus bar pieces 81 adjacent in the circumferential direction. Each connecting portion 82 is welded and connected by, for example, TIG welding or the like in a state where the circumferentially outer surfaces 82A are overlapped. Thereby, a substantially annular neutral point bus bar 48 is formed.

図8は、コイル16の結線図状態を示す説明図である。
このように構成されたバスバーユニット17は、各相用バスバー47U,47V,47Wの相用端子49U,49V,49Wに各相のコイル16の巻き始め端部45Aを接続すると共に、中性点用バスバー48の中性点用端子50に各相のコイル16の巻き終わり端部45Bを接続する。すると、各相のコイル16はスター結線方式にて結線された状態になる。中性点用バスバー48には、それぞれ各相用のバスバー片81U,81V,81W間に接続部82が設けられているので、各相のコイル16間に1対の接続部82が配置された状態になる。
FIG. 8 is an explanatory diagram showing a connection diagram state of the coil 16.
The bus bar unit 17 configured in this way connects the winding start end 45A of the coil 16 of each phase to the phase terminals 49U, 49V, 49W of the bus bars 47U, 47V, 47W for each phase, and for the neutral point. The winding end end 45 </ b> B of the coil 16 of each phase is connected to the neutral point terminal 50 of the bus bar 48. Then, the coil 16 of each phase will be in the state connected by the star connection system. The neutral point bus bar 48 is provided with the connection portions 82 between the bus bar pieces 81U, 81V, 81W for the respective phases, so that a pair of connection portions 82 are arranged between the coils 16 of the respective phases. It becomes a state. The bus bar unit 17 configured in this way connects the winding start end 45A of the coil 16 of each phase to the phase terminals 49U, 49V, 49W of the bus bars 47U, 47V, 47W for each phase, and for the neutral point. The winding end end 45 </ b> B of the coil 16 of each phase is connected to the neutral point terminal 50 of the bus bar 48. Then, the coil 16 of each phase will be in the state connected by the star connection system The neutral point bus bar 48 is provided with the connection portions 82 between the bus bar pieces 81U, 81V, 81W for the respective phases, so that a pair of connection portions 82 are arranged between the similarly 16 of the respective phases. It becomes a state.

ここで、図4に示すように、樹脂モールド体46の他端面(ステータコア12側の端面)46Cには、中性点用バスバー48の接続部82に対応する部位に、接続用窓83が形成されている。この接続用窓83は、接続部82の接続作業を行うためのものであって、接続部82を露出させるようになっている。   Here, as shown in FIG. 4, a connection window 83 is formed on the other end surface (end surface on the stator core 12 side) 46 </ b> C of the resin mold body 46 at a portion corresponding to the connection portion 82 of the neutral point bus bar 48. Has been. The connection window 83 is used for connecting the connection portion 82 and exposes the connection portion 82.

また、接続用窓83の周方向両側には、ステータコア12側(図4における右側)に向かって、軸方向に沿うように立ち上がり形成された一対の壁84,84が設けられている。この壁84は接続用窓83から露出する接続部82とステータコア12に巻装されている各相のコイル16との接触を阻止する役割を有するものである。壁84は、径方向に沿う方向に、樹脂モールド体46の内周縁から外周縁に至る間に延在している。また、壁84の立ち上がり高さは、接続部82の高さよりもやや高くなるように設定されている。   Further, on both sides in the circumferential direction of the connection window 83, a pair of walls 84, 84 are formed so as to rise along the axial direction toward the stator core 12 side (right side in FIG. 4). The wall 84 serves to prevent contact between the connection portion 82 exposed from the connection window 83 and the coil 16 of each phase wound around the stator core 12. The wall 84 extends in a direction along the radial direction from the inner peripheral edge to the outer peripheral edge of the resin mold body 46. The rising height of the wall 84 is set to be slightly higher than the height of the connection portion 82.

(作用)
次に、バスバーユニット17の製造方法について説明する。
まず、不図示の金属板から各相用バスバー47U,47V,47Wをプレス加工等によって打ち抜くと共に、バスバー片81をプレス加工等によって打ち抜く。
次に、不図示の金型内に、各相のバスバー47U,47V,47Wと、バスバー片81とを金型内に位置決めさせた状態で、この金型内に樹脂を流し込み、各相のバスバー47U,47V,47Wと、バスバー片81とを樹脂モールドする。
(Function)
Next, a method for manufacturing the bus bar unit 17 will be described.
First, the bus bars 47U, 47V, 47W for each phase are punched from a metal plate (not shown) by pressing or the like, and the bus bar piece 81 is punched by pressing or the like.
Next, in a state where the bus bars 47U, 47V, 47W of the respective phases and the bus bar pieces 81 are positioned in the mold in a mold (not shown), the resin is poured into the mold, 47U, 47V, 47W and the bus bar piece 81 are resin-molded. Next, in a state where the bus bars 47U, 47V, 47W of the respective phases and the bus bar pieces 81 are positioned in the mold in a mold (not shown), the resin is injected into the mold, 47U, 47V, 47W and the bus bar piece 81 are resin-molded.

このとき、隣接するバスバー片81の接続部82は、それぞれ周方向外側の面82Aが互いに重ね合わさった状態で位置決めされ、それぞれ溶接接続されていない状態で樹脂モールドされる。そして、樹脂モールド体46が形成された後、樹脂モールド体46の接続用窓83から露出した接続部82をTIG溶接等によって溶接接続する。これによって、各バスバー片81が接続され、中性点用バスバー48が形成されると共に、バスバーユニット17の製造が完了する。   At this time, the connection portions 82 of the adjacent bus bar pieces 81 are positioned in a state where the circumferentially outer surfaces 82A overlap each other, and are resin-molded in a state where they are not welded. After the resin mold body 46 is formed, the connection portion 82 exposed from the connection window 83 of the resin mold body 46 is welded and connected by TIG welding or the like. As a result, the bus bar pieces 81 are connected to form the neutral point bus bar 48 and the manufacture of the bus bar unit 17 is completed.

このように製造されたバスバーユニット17は、中性点用バスバー48、および脚部44をステータコア12側に向けた状態で、ステータコア12のブラケット4とは反対側端に載置される。このとき、予めコイル16の巻き始め端部45Aをインシュレータ15の巻き始め端用凹部72を介して径方向外側に引き出しておく。また、コイル16の巻き終わり端45Bをインシュレータ15の巻き終わり端用凹部73を介して径方向外側に引き出しておく。この後、バスバーユニット17の脚部44をステータコア12のインシュレータ15に形成されている凹部77に嵌合させるようにしてバスバーユニット17の位置決めを行いつつ、バスバーユニット17をインシュレータ15上に載置する。   The bus bar unit 17 manufactured in this way is placed on the end of the stator core 12 opposite to the bracket 4 with the neutral point bus bar 48 and the leg 44 facing the stator core 12 side. At this time, the winding start end portion 45 </ b> A of the coil 16 is drawn out to the outside in the radial direction via the winding start end recess 72 of the insulator 15 in advance. In addition, the winding end 45B of the coil 16 is pulled out radially outward via the winding end recess 73 of the insulator 15. Thereafter, the bus bar unit 17 is placed on the insulator 15 while positioning the bus bar unit 17 by fitting the leg portions 44 of the bus bar unit 17 into the recesses 77 formed in the insulator 15 of the stator core 12. .

バスバーユニット17の脚部44をステータコア12のインシュレータ15に形成されている凹部77に嵌合させてバスバーユニット17の位置決めを行うと、バスバーユニット17の各端子49U〜50は、対応するコイル16の端部45A,45Bの引き出し位置、つまり、対応するインシュレータ15の各凹部72,73に近接する位置に配置された状態になる。このため、コイル16の各端部45A,45Bをバスバーユニット17の各端子49U〜50に容易に接続することができる。   When the leg portions 44 of the bus bar unit 17 are fitted into the recesses 77 formed in the insulator 15 of the stator core 12 to position the bus bar unit 17, the terminals 49 U to 50 U of the bus bar unit 17 are connected to the corresponding coils 16. The end portions 45 </ b> A and 45 </ b> B are pulled out, that is, placed at positions close to the respective recesses 72 and 73 of the corresponding insulator 15. Therefore, the end portions 45A and 45B of the coil 16 can be easily connected to the terminals 49U to 50 of the bus bar unit 17.

また、コイル16の各端部45A,45Bがそれぞれ凹部72,73を介して径方向外側に引き出されているので、バスバーユニット17の各端子49U〜50とコイル16の各端部45A,45Bとが干渉するのを回避することができると共に、バスバーユニット17をインシュレータ15上に載置し易くなる。
さらに、バスバーユニット17の樹脂モールド体46に形成された接続用窓83から中性点用バスバー48の接続部82がステータコア12のコイル16に向かって露出した状態になっているが、接続用窓83の周方向両側に壁84が立ち上がり形成されているので、この壁84によって接続部82とコイル16との接触が確実に防止される。 Further, the connection portion 82 of the neutral point bus bar 48 is exposed from the connection window 83 formed in the resin mold body 46 of the bus bar unit 17 toward the coil 16 of the stator core 12, but the connection window Since the walls 84 are formed so as to rise on both sides in the circumferential direction of the 83, the walls 84 reliably prevent the connection portion 82 from coming into contact with the coil 16. Further, since the end portions 45A and 45B of the coil 16 are drawn out radially outward through the recesses 72 and 73, respectively, the terminals 49U to 50U of the bus bar unit 17 and the end portions 45A and 45B of the coil 16 Can be avoided, and the bus bar unit 17 can be easily placed on the insulator 15. Further, since the end portions 45A and 45B of the coil 16 are drawn out insulating outward through the recesses 72 and 73, respectively, the terminals 49U to 50U of the bus bar unit 17 and the end portions 45A and 45B of the coil 16 Can be avoided, and the bus bar unit 17 can be easily placed on the insulator 15.
Further, the connection portion 82 of the neutral point bus bar 48 is exposed toward the coil 16 of the stator core 12 from the connection window 83 formed in the resin mold body 46 of the bus bar unit 17. Since the walls 84 are formed so as to rise on both sides in the circumferential direction 83, the wall 84 reliably prevents the connection portion 82 and the coil 16 from contacting each other. Further, the connection portion 82 of the neutral point bus bar 48 is exposed toward the coil 16 of the stator core 12 from the connection window 83 formed in the resin mold body 46 of the bus bar unit 17. Since the walls 84 are formed so as to rise on both sides in the producing direction 83, the wall 84 reliably prevents the connection portion 82 and the coil 16 from contacting each other.

このような構成のもと、各相のコイル16の巻き始め端部45A間に電圧を印加すると、各相のコイル16に所望の電流が供給される。このとき、各相のコイル16間には、中性点用バスバー48に形成されている接続部82がそれぞれ1対ずつ均等配置された状態になるので、それぞれの相の間の抵抗値を同一に設定することができる。このため、各相のコイル16に所望の磁界が発生する。
各相のコイル16に磁界が発生すると、この磁界とロータ3のロータマグネット33との間に吸引力、または反発力が発生し、これによってロータ3が回転する。 When a magnetic field is generated in the coils 16 of each phase, an attractive force or a repulsive force is generated between the magnetic field and the rotor magnet 33 of the rotor 3, thereby rotating the rotor 3. Under such a configuration, when a voltage is applied between the winding start ends 45A of the coils 16 of each phase, a desired current is supplied to the coils 16 of each phase. At this time, a pair of connecting portions 82 formed on the neutral point bus bar 48 are equally arranged between the coils 16 of each phase, so that the resistance values between the respective phases are the same. Can be set to For this reason, a desired magnetic field is generated in the coil 16 of each phase. Under such a configuration, when a voltage is applied between the winding start ends 45A of the similarly 16 of each phase, a desired current is supplied to the similarly 16 of each phase. At this time, a pair of connecting portions 82 formed on the neutral point bus bar 48 are equally arranged between the generating 16 of each phase, so that the resistance values ​​between the respective phases are the same. Can be set to For this reason, a desired magnetic field is generated in the coil 16 of each phase ..
When a magnetic field is generated in the coil 16 of each phase, an attractive force or a repulsive force is generated between the magnetic field and the rotor magnet 33 of the rotor 3, thereby rotating the rotor 3. When a magnetic field is generated in the coil 16 of each phase, an attractive force or a repulsive force is generated between the magnetic field and the rotor magnet 33 of the rotor 3, thereby rotating the rotor 3.

(効果)
したがって、上述の実施形態によれば、中性点用バスバー48を製造するにあたって、従来のように、金属板から略円環状に打ち抜く必要がなく、周方向に分割された略円弧状のバスバー片81を打ち抜けばよくなる。このため、金属板の使用されない部分が減少し、歩留まりが向上する。よって、バスバーユニット17の製造コストを低減することができる。
(effect)
Therefore, according to the above-described embodiment, when manufacturing the neutral point bus bar 48, it is not necessary to punch out from the metal plate in a substantially annular shape as in the prior art, and the substantially arc-shaped bus bar piece divided in the circumferential direction. You can get through 81. For this reason, the unused part of the metal plate is reduced and the yield is improved. Therefore, the manufacturing cost of the bus bar unit 17 can be reduced. Therefore, according to the above-described embodiment, when manufacturing the neutral point bus bar 48, it is not necessary to punch out from the metal plate in a substantially annular shape as in the prior art, and the substantially arc-shaped bus bar piece divided in the preceding direction. You can get through 81. For this reason, the unused part of the metal plate is reduced and the yield is improved. Therefore, the manufacturing cost of the bus bar unit 17 can be reduced.

また、中性点用バスバー48は、3相のコイル16に対応するように、周方向に3分割されたバスバー片81を互いに接続することで成るので、各相のコイル16間に、接続部82がそれぞれ1対ずつ均等配置された状態になる。このため、それぞれの相の間の抵抗値を同一の値に設定することができ、電力の供給の仕方によって各相のコイル16に磁力差が生じてしまうのを防止できる。よって、ブラシレスモータ1の性能特性の低下を防止することが可能になる。   Further, since the neutral point bus bar 48 is formed by connecting the bus bar pieces 81 divided into three in the circumferential direction so as to correspond to the three-phase coil 16, the connection portion is provided between the coil 16 of each phase. One pair of 82 is evenly arranged. For this reason, the resistance value between each phase can be set to the same value, and it can prevent that the magnetic force difference arises in the coil 16 of each phase by the method of supplying electric power. Therefore, it is possible to prevent the performance characteristics of the brushless motor 1 from being deteriorated.

さらに、樹脂モールド体46に、接続用窓83を形成し、ここから接続部82を露出させるように構成されている。このため、各相のバスバー47U,47V,47Wと、バスバー片81とを樹脂モールドした後、接続部82の溶接接続を行うことができる。よって、バスバーユニット17の組み立て作業性を向上させることができると共に、中性点用バスバー48を単体で形成する場合と比較して余分な治具等を用意する必要がなく、製造コストの増大を抑制することができる。   Further, a connection window 83 is formed in the resin mold body 46, and the connection portion 82 is exposed therefrom. For this reason, after the bus bars 47U, 47V, 47W of the respective phases and the bus bar pieces 81 are resin-molded, the connection portion 82 can be welded. Therefore, the assembly workability of the bus bar unit 17 can be improved, and it is not necessary to prepare an extra jig or the like as compared with the case where the neutral point bus bar 48 is formed as a single unit, which increases the manufacturing cost. Can be suppressed.

そして、接続用窓83の周方向両側に、一対の壁84,84を設けることにより、接続用窓83から露出する接続部82とステータコア12に巻装されている各相のコイル16との接触を確実に阻止することができる。このため、信頼性の高いブラシレスモータ1を提供することができる。   Then, by providing a pair of walls 84, 84 on both sides in the circumferential direction of the connection window 83, the contact between the connection portion 82 exposed from the connection window 83 and the coil 16 of each phase wound around the stator core 12. Can be reliably prevented. For this reason, the highly reliable brushless motor 1 can be provided.

なお、本発明は上述の実施形態に限られるものではなく、本発明の趣旨を逸脱しない範囲において、上述の実施形態に種々の変更を加えたものを含む。
また、上述の実施形態では、ブラシレスモータ1は、例えば、電動パワーステアリング装置に用いられるものである場合について説明した。しかしながら、これに限られるものではなく、様々な電装品にブラシレスモータ1を適用することが可能である。
The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention.
Moreover, in the above-mentioned embodiment, the case where the brushless motor 1 was used for an electric power steering apparatus was demonstrated, for example. However, the present invention is not limited to this, and the brushless motor 1 can be applied to various electrical components. Moreover, in the above-mentioned embodiment, the case where the brushless motor 1 was used for an electric power steering apparatus was demonstrated, for example. However, the present invention is not limited to this, and the brushless motor 1 can be applied to various electrical components.

さらに、上述の実施形態では、中性点用バスバー48は、3相のコイル16に対応するように、周方向に3分割されたバスバー片81を互いに接続することで成る場合について説明した。しかしながら、これに限られるものではなく、例えば、コイル16が3相以上で構成されている場合にあっては、コイル16の相数に応じて中性点用バスバー48を周方向に分割し、これら分割した各片をバスバー片81として構成してもよい。   Furthermore, in the above-described embodiment, the case where the neutral point bus bar 48 is formed by connecting the bus bar pieces 81 divided into three in the circumferential direction so as to correspond to the three-phase coil 16 has been described. However, the present invention is not limited to this. For example, when the coil 16 is composed of three or more phases, the neutral point bus bar 48 is divided in the circumferential direction according to the number of phases of the coil 16, Each of these divided pieces may be configured as a bus bar piece 81.

そして、バスバー片81は、コイル16の相の数に対応させることなく、任意の数で構成してもよい。例えば、3相のコイル16で構成されるブラシレスモータ1において、中性点用バスバー48を周方向に4つ以上に分割されたバスバー片81で構成してもよい。バスバー片81を複数で構成すればするほど、歩留まりを向上させることが可能になる。また、バスバー片81の数を相の数の整数倍に設定すれば、各相の間の抵抗値を同一の値に設定することが可能になる。   And you may comprise the bus-bar piece 81 by arbitrary numbers, without making it respond | correspond to the number of the phases of the coil 16. FIG. For example, in the brushless motor 1 constituted by the three-phase coil 16, the neutral point bus bar 48 may be constituted by four or more bus bar pieces 81 divided in the circumferential direction. The more the bus bar pieces 81 are configured, the more the yield can be improved. If the number of bus bar pieces 81 is set to an integral multiple of the number of phases, the resistance value between the phases can be set to the same value.

また、上述の実施形態では、樹脂モールド体46に形成されている接続用窓83の周方向両側に、一対の壁84,84を径方向に沿って設けた場合について説明した。しかしながら、これに限られるものではなく、各接続用窓83の近傍に、少なくとも1つ壁を突設させればよい。この壁は、径方向に沿う方向に延在形成させることなく、樹脂モールド体46から突出形成されていればよい。このように構成しても壁によって中性点用バスバー48の接続部82と各相のコイル16との間に確実に空隙を形成することが可能になる。このため、接続部82と各相のコイル16との接触を阻止できる。   Further, in the above-described embodiment, the case where the pair of walls 84 and 84 are provided along the radial direction on both sides in the circumferential direction of the connection window 83 formed in the resin mold body 46 has been described. However, the present invention is not limited to this, and at least one wall may be provided in the vicinity of each connection window 83. The wall may be formed so as to protrude from the resin mold body 46 without extending in the direction along the radial direction. Even with this configuration, it is possible to reliably form a gap between the connecting portion 82 of the neutral point bus bar 48 and the coil 16 of each phase by the wall. For this reason, the contact between the connecting portion 82 and the coil 16 of each phase can be prevented.

さらに、上述の実施形態では、各バスバー片81に形成された接続部82を接続するにあたり、例えば、TIG溶接等を用いた場合について説明した。しかしながら、これに限られるものではなく、種々の溶接方法が適用可能である。例えば、TIG溶接に代わってスポット溶接によって接続部82の接続を行ってもよい。   Furthermore, in the above-described embodiment, the case where, for example, TIG welding or the like is used to connect the connection portions 82 formed on each bus bar piece 81 has been described. However, the present invention is not limited to this, and various welding methods can be applied. For example, the connecting portion 82 may be connected by spot welding instead of TIG welding.

1 ブラシレスモータ
2 ステータ
3 ロータ
16 コイル
17 バスバーユニット
45B 巻き終わり端部
46 樹脂モールド体
46C 他端面(端面)
47U U相用バスバー(相用バスバー)
47V V相用バスバー(相用バスバー)
47W W相用バスバー(相用バスバー)
48 中性点用バスバー
50 中性点用端子
81 バスバー片
81U U相用のバスバー片
81V V相用のバスバー片
81W W相用のバスバー片
82 接続部
83 接続用窓
84 壁
1 Brushless motor 2 Stator 3 Rotor 16 Coil 17 Busbar unit
45B Winding end portion 46 Resin mold body 46C The other end surface (end surface)
47U U-phase bus bar (phase bus bar)
47V V-phase bus bar (phase bus bar)
47W W-phase bus bar (phase bus bar) 47W W-phase bus bar (phase bus bar)
48 Neutral point bus bar 48 Neutral point bus bar
50 Neutral point terminal 81 Bus bar piece 81U U-phase bus bar piece 81V V-phase bus bar piece 81W W-phase bus bar piece 82 Connection portion 83 Connection window 84 Wall 50 Neutral point terminal 81 Bus bar piece 81U U-phase bus bar piece 81V V-phase bus bar piece 81W W-phase bus bar piece 82 Connection portion 83 Connection window 84 Wall

Claims (4)

  1. 複数の相のコイルが巻装されたステータと、
    前記ステータに対して回転自在に設けられたロータと、
    各相のコイルに給電するためのバスバーユニットとを備え、
    前記バスバーユニットは、
    樹脂モールド体に、
    相毎に設けられ各々相のコイルに給電を行うための複数の相用バスバーと、
    中性点を成す環状の中性点用バスバーとをそれぞれ積層し、
    これら複数の相用バスバーと中性点用バスバーとが互いに絶縁した状態で埋設されて成るブラシレスモータであって、
    前記中性点用バスバーは、
    それぞれ対応する前記複数の相のコイルの巻き終わり端部に対応する位置に、前記複数の相と同じ数の中性点用端子が設けられるよう、周方向に分割された複数の中性片から成り、 From a plurality of neutral pieces divided in the circumferential direction so that the same number of neutral point terminals as the plurality of phases are provided at positions corresponding to the winding end ends of the coils of the plurality of phases corresponding to each. It's made up
    各中性片には、それぞれ周方向に隣り合う前記中性片同士を接続するための接続部が設けられ Each neutral piece, connecting portions for connecting said neutral strip adjacent to the respective circumferential direction is provided,
    前記樹脂モールド体は、前記中性片をそれぞれ接続されていない状態で樹脂モールドされて形成され、 The resin molded body is formed by resin molding with the neutral pieces not connected to each other.
    前記樹脂モールド体には、それぞれ周方向に隣り合う前記中性片同士を接続する前記接続部に対応する部位に、前記接続部を露出させるための接続用窓が形成されていることを特徴とするブラシレスモータ。 The resin molded body is characterized in that a connection window for exposing the connection portion is formed at a portion corresponding to the connection portion for connecting the neutral pieces adjacent to each other in the circumferential direction. Brushless motor to do. A stator on which coils of a plurality of phases are wound; A stator on which coil of a plurality of phases are wound;
    A rotor provided rotatably with respect to the stator; A rotor provided rotatably with respect to the stator;
    A bus bar unit for supplying power to the coils of each phase, A bus bar unit for supplying power to the coil of each phase,
    The bus bar unit is The bus bar unit is
    To resin mold body, To resin mold body,
    A plurality of phase bus bars for supplying power to the coils of each phase provided for each phase; A plurality of phase bus bars for supplying power to the coil of each phase provided for each phase;
    Laminate an annular neutral point bus bar that forms a neutral point, Laminate an annular neutral point bus bar that forms a neutral point,
    A brushless motor in which the plurality of phase bus bars and the neutral point bus bar are embedded in a state of being insulated from each other, A brushless motor in which the plurality of phase bus bars and the neutral point bus bar are embedded in a state of being insulated from each other,
    The neutral point bus bar is The neutral point bus bar is
    From a plurality of neutral pieces divided in the circumferential direction so that the same number of neutral point terminals as the plurality of phases are provided at positions corresponding to the winding end portions of the corresponding plurality of phases of coils. Consists of From a plurality of neutral pieces divided in the traveling direction so that the same number of neutral point terminals as the plurality of phases are provided at positions corresponding to the winding end portions of the corresponding plurality of phases of relatively.
    Each neutral piece, connecting portions for connecting said neutral strip adjacent to the respective circumferential direction is provided, Each neutral piece, connecting portions for connecting said neutral strip adjacent to the respective respective directions is provided,
    The resin mold body is formed by resin molding in a state where the neutral pieces are not connected to each other, The resin mold body is formed by resin molding in a state where the neutral pieces are not connected to each other,
    In the resin mold body, a connection window for exposing the connection portion is formed at a portion corresponding to the connection portion that connects the neutral pieces adjacent to each other in the circumferential direction. Brushless motor. In the resin mold body, a connection window for exposing the connection portion is formed at a portion corresponding to the connection portion that connects the neutral pieces adjacent to each other in the producing direction. Brushless motor.
  2. 前記接続部は、軸方向に沿うように曲折形成され、それぞれ隣り合う前記中性片同士の前記接続部を重ね合わせた状態で溶接接続されることを特徴とする請求項1に記載のブラシレスモータ。 2. The brushless motor according to claim 1, wherein the connection portion is formed to be bent along the axial direction and welded in a state where the connection portions of the neutral pieces adjacent to each other are overlapped. .
  3. 前記複数の相のコイルは、3相のコイルに構成されており、
    前記中性点用バスバーは、3つの前記中性片で構成されていることを特徴とする請求項1または請求項2に記載のブラシレスモータ。 The brushless motor according to claim 1 or 2 , wherein the neutral point bus bar is composed of the three neutral pieces. The plurality of phase coils are configured as a three-phase coil, The plurality of phase stably are configured as a three-phase coil,
    Bus bar wherein the neutral point, brushless motor according to claim 1 or claim 2, characterized in that it consists of three of said neutral strip. Bus bar wherein the neutral point, brushless motor according to claim 1 or claim 2, characterized in that it consists of three of said neutral strip.
  4. それぞれ隣り合う前記中性片を接続する前記接続部、および前記接続用窓の位置を前記樹脂モールド体の軸方向端面に設定し、
    前記接続用窓の近傍に、軸方向に沿って立ち上がる壁を設けたことを特徴とする請求項3に記載のブラシレスモータ。 The brushless motor according to claim 3, wherein a wall rising along the axial direction is provided in the vicinity of the connection window. The position of the connection portion connecting the neutral pieces adjacent to each other , and the position of the connection window is set on the axial end surface of the resin mold body, The position of the connection portion connecting the neutral pieces adjacent to each other , and the position of the connection window is set on the axial end surface of the resin mold body,
    The brushless motor according to claim 3, wherein a wall rising along the axial direction is provided in the vicinity of the connection window. The brushless motor according to claim 3, wherein a wall rising along the axial direction is provided in the vicinity of the connection window.
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