JP2009033935A - Brushless motor - Google Patents

Brushless motor Download PDF

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JP2009033935A
JP2009033935A JP2007197871A JP2007197871A JP2009033935A JP 2009033935 A JP2009033935 A JP 2009033935A JP 2007197871 A JP2007197871 A JP 2007197871A JP 2007197871 A JP2007197871 A JP 2007197871A JP 2009033935 A JP2009033935 A JP 2009033935A
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core
housing
stator
brushless motor
motor
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JP5037257B2 (en
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Takayuki Kobayashi
貴行 小林
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Showa Corp
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Showa Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a brushless motor in which cores of a stator are easily assembled to a housing. <P>SOLUTION: The brushless motor 20 has a structure in which the external circumference of the cores 31 laminated to form the stator 30 is gap-fitted in the internal circumference of the housing 21, one end of a laminate direction of the cores 31 is made to abut on a stopper 21A provided on one end side of the internal circumference of the housing 21, and the other end of the laminate direction of the core 31 is supported by a fixing member 80 fixed on the other end side of the internal circumference of the housing 21, wherein one part of the cores 31 serves as a spring portion 81 protruding in the laminate direction, and a spring portion 81 of the core 31 which is positioned at the outermost of the laminate direction elastically abuts on any one of the stopper 21A and the fixing member 80. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は電動パワーステアリング装置等に用いて好適なブラシレスモータに関する。   The present invention relates to a brushless motor suitable for use in an electric power steering device or the like.

電動パワーステアリング装置用のブラシレスモータは、永久磁石を有する回転子と、複数のコイルを巻装したコアを備える固定子とを有し、コイルへの通電を切り替えることで回転子を回転させるものであり、車両の電動パワーステアリング装置のモータ部に適用されている。例えば、ラックタイプの電動パワーステアリング装置においては、同軸タイプのブラシレスモータが用いられ、回転子の回転軸内にラック軸が挿入され、車体側に固定されるハウジング側に固定子が形成される。そして、ブラシレスモータでは、コイルへの通電を切り替えるタイミングを決定するために、固定子に対する回転子の回転位置を検出する位置検出用センサとしてレゾルバが設けられている。   A brushless motor for an electric power steering device has a rotor having a permanent magnet and a stator having a core wound with a plurality of coils, and rotates the rotor by switching energization to the coils. Yes, it is applied to the motor part of the electric power steering device for vehicles. For example, in a rack type electric power steering apparatus, a coaxial type brushless motor is used, a rack shaft is inserted into a rotating shaft of a rotor, and a stator is formed on a housing side fixed to the vehicle body side. In the brushless motor, a resolver is provided as a position detection sensor for detecting the rotational position of the rotor relative to the stator in order to determine the timing for switching the energization to the coil.

従来の電動パワーステアリング装置では、特許文献１に記載の如く、１つのハウジングに固定子を固定しており、固定子を構成するように積層したコアを周方向に配置し、このコアを上記ハウジングに焼き嵌めして固定している。
特開2007-1364 In the conventional electric power steering apparatus, as described in Patent Document 1, a stator is fixed to one housing, and cores stacked so as to constitute the stator are arranged in the circumferential direction, and the core is disposed in the housing. It is fixed by shrink fitting.
JP2007-1364

特許文献１に記載のブラシレスモータには以下の問題点がある。
(1)１つのハウジングに固定子のコアを焼き嵌めしているため、焼き嵌め設備と組付工数が多大になる。 The brushless motor described in Patent Document 1 has the following problems.
(1) Since the stator core is shrink-fitted in one housing, the shrink-fitting equipment and assembly man-hours become large.

(2)ハウジング(アルミニウム)とコア(鉄)の線膨長係数の違いにより、高温時にはハウジングが径方向に伸びてコアを固定できなくなり、これを回避するために両者の締め代を強くすると、低温時のハウジングに過大応力を生ずるため、ハウジングの材料強度を上げる必要があり、コスト高になる。   (2) Due to the difference in coefficient of linear expansion between the housing (aluminum) and the core (iron), the housing expands in the radial direction at high temperatures, making it impossible to fix the core. Since excessive stress is generated in the housing at a low temperature, it is necessary to increase the material strength of the housing, resulting in high cost.

そこで、固定子のコアをハウジングに簡易に組付けし、しかもハウジングに強度材料の適用を必要としないブラシレスモータとして、積層コアの外周をハウジングの内周に隙間嵌めし、コアの積層方向の一端がハウジングの内周の一端側に設けたストッパに突き当てられ、コアの積層方向の他端が皿バネを介して、ハウジングの内周の他端側に圧入した固定リングにより支持されるようにするものが考えられる。ハウジングとコアの線膨長係数の違いにより、ハウジングとコアの積層方向に生ずるガタを皿バネの弾性撓み量により吸収する。コアをハウジングに焼き嵌めすることなく簡易に組付け、しかもハウジングに過大応力を生じさせないから該ハウジングに強度材料を適用する必要もなく、コアをハウジングの内周に確実に固定できる。しかしながら、皿バネを必要とするという不都合がある。   Therefore, as a brushless motor in which the stator core is simply assembled to the housing and does not require the application of a strong material to the housing, the outer periphery of the laminated core is fitted into the inner periphery of the housing, and one end of the core in the stacking direction. Is abutted against a stopper provided on one end of the inner periphery of the housing, and the other end of the core in the stacking direction is supported by a fixing ring press-fitted to the other end of the inner periphery of the housing via a disc spring. What to do is conceivable. The backlash generated in the stacking direction of the housing and the core due to the difference in linear expansion coefficient between the housing and the core is absorbed by the elastic deflection amount of the disc spring. The core can be easily assembled without shrink fitting into the housing, and an excessive stress is not generated in the housing, so that it is not necessary to apply a strength material to the housing, and the core can be securely fixed to the inner periphery of the housing. However, there is a disadvantage that a disc spring is required.

本発明の課題は、ブラシレスモータにおいて、固定子のコアをハウジングに簡易に組付けることにある。   An object of the present invention is to easily assemble a stator core to a housing in a brushless motor.

請求項１の発明は、ハウジングに固定子を固定し、固定子の内周側に回転可能に配置される回転軸に回転子を設けてなるブラシレスモータにおいて、固定子を構成するように積層されるコアの外周をハウジングの内周に隙間嵌めし、該コアの積層方向の一端をハウジングの内周の一端側に設けたストッパに突き当て、該コアの積層方向の他端をハウジングの内周の他端側に固定した固定具により支持するに際し、該コアの一部を積層方向に突き出るバネ部とし、積層方向の最も外側に位置するコアのバネ部を上記のストッパと固定具の一方に弾発的に衝合させてなるようにしたものである。   The invention of claim 1 is a brushless motor in which a stator is fixed to a housing, and a rotor is provided on a rotary shaft that is rotatably arranged on the inner peripheral side of the stator. The outer periphery of the core is fitted into the inner periphery of the housing, one end in the stacking direction of the core is abutted against a stopper provided on one end side of the inner periphery of the housing, and the other end in the stacking direction of the core is connected to the inner periphery of the housing. When supporting by a fixing tool fixed to the other end of the core, a part of the core is used as a spring part protruding in the stacking direction, and the spring part of the core located on the outermost side in the stacking direction is set to one of the stopper and the fixing tool. It is intended to be collided with each other.

請求項２の発明は、請求項１に記載のブラシレスモータを用いた電動パワーステアリング装置である。   A second aspect of the present invention is an electric power steering apparatus using the brushless motor according to the first aspect.

（請求項１）
(a)ハウジングとコアの線膨長係数の違いにより、ハウジングとコアの積層方向に生ずるガタをコアのバネ部の弾性撓み量により吸収する。コアをハウジングに焼き嵌めすることなく簡易に組付け、しかもハウジングに過大応力を生じさせないから該ハウジングに強度材料を適用する必要もなく、コアをハウジングの内周に確実に固定できる。皿バネ等の別部品を必要とせず、コアの組付構造を簡略化できる。 (Claim 1)
(a) The backlash generated in the stacking direction of the housing and the core due to the difference in linear expansion coefficient between the housing and the core is absorbed by the elastic deflection amount of the spring portion of the core. The core can be easily assembled without shrink fitting into the housing, and an excessive stress is not generated in the housing, so that it is not necessary to apply a strength material to the housing, and the core can be securely fixed to the inner periphery of the housing. A separate assembly such as a disc spring is not required, and the assembly structure of the core can be simplified.

（請求項２）
(b)電動パワーステアリング装置において、上述(a)を実現できる。 (Claim 2)
(b) In the electric power steering apparatus, the above (a) can be realized.

図１は電動パワーステアリング装置を示す全体図、図２は図１の要部断面図、図３はブラシレスモータを示す断面図、図４は図３のIV部を拡大して示す断面図、図５は積層コアを示す斜視図である。   1 is an overall view showing an electric power steering device, FIG. 2 is a cross-sectional view of the main part of FIG. 1, FIG. 3 is a cross-sectional view of a brushless motor, and FIG. 5 is a perspective view showing a laminated core.

電動パワーステアリング装置１０は、図１、図２に示す如く、ステアリングホイールが結合される入力軸１１を支持するギヤボックス１２を有し、ギヤボックス１２を第１ハウジング部１３に取付けている。第１ハウジング部１３は車体への取付部１３Ａを有し、第１ハウジング部１３にはモータ部１５を介して第２ハウジング部１４が取付けられている。ギヤボックス１２内では、入力軸１１にトーションバーを介して出力軸（不図示）が連結され、入力軸１１と出力軸の間に操舵トルク検出装置（不図示）を組付けている。第１ハウジング部１３、第２ハウジング部１４、モータ部１５にはラック軸１６が挿入されて支持され、ラック軸１６のラック歯はギヤボックス１２内で出力軸のピニオン歯と噛み合いしてラック・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軸方向に直線移動する。尚、ラック軸１６の両端部にはタイロッド１７Ａ、１７Ｂが連結され、ラック軸１６の直線移動によりタイロッド１７Ａ、１７Ｂを介して左右の車輪を操舵可能にする。   As shown in FIGS. 1 and 2, the electric power steering apparatus 10 includes a gear box 12 that supports an input shaft 11 to which a steering wheel is coupled, and the gear box 12 is attached to a first housing portion 13. The first housing part 13 has an attachment part 13A for the vehicle body, and the second housing part 14 is attached to the first housing part 13 via the motor part 15. In the gear box 12, an output shaft (not shown) is connected to the input shaft 11 via a torsion bar, and a steering torque detection device (not shown) is assembled between the input shaft 11 and the output shaft. A rack shaft 16 is inserted and supported in the first housing portion 13, the second housing portion 14, and the motor portion 15, and the rack teeth of the rack shaft 16 mesh with the pinion teeth of the output shaft in the gear box 12. An and pinion mechanism is formed and linearly moves in the axial direction in accordance with the operation of the steering wheel. Note that tie rods 17A and 17B are connected to both ends of the rack shaft 16, and the left and right wheels can be steered via the tie rods 17A and 17B by linear movement of the rack shaft 16.

電動パワーステアリング装置１０は、第１ハウジング部１３と第２ハウジング部１４のそれぞれにボルト１８、１９によりモータ部１５のヨークを構成するようにアルミニウム等からなるモータハウジング２１を取付け、ラック軸１６と同軸をなすブラシレスモータ２０を構成する。ブラシレスモータ２０は、固定子３０と、固定子３０の内周側に回転自在に配置される回転子４０と、固定子３０に対する回転子４０の回転位置を検出するレゾルバ６０を有する。   The electric power steering apparatus 10 has a motor housing 21 made of aluminum or the like attached to the first housing portion 13 and the second housing portion 14 by bolts 18 and 19 so as to form a yoke of the motor portion 15. The brushless motor 20 which makes the same axis | shaft is comprised. The brushless motor 20 includes a stator 30, a rotor 40 that is rotatably disposed on the inner peripheral side of the stator 30, and a resolver 60 that detects a rotational position of the rotor 40 with respect to the stator 30.

固定子３０は、図２〜図４に示す如く、モータハウジング２１の内周に後述する如くに組込まれて固定される、複数、本実施例では例えばＵ相、Ｖ相、Ｗ相の各相毎に4個（全12個)のコア小組体３０Ｂを円周上に隣接配置して構成されるコア組立体３０Ａを有する。コア小組体３０Ｂは、複数の珪素鋼板からなるコア３１を積層し、この積層コア３１に樹脂製ボビン３２を取付け、ボビン３２のコイル巻回部にＵ相、Ｖ相、Ｗ相の３相をなす各モータコイル３３を巻装して構成される。各コイル３３には、本実施例ではボビン３２に取付けられるターミナル３４を介して通電され、ターミナル３４に給電する接続端子３５がプラグ（カプラ）３６を介してモータハウジング２１の外側に引き出される。即ち、プラグ３６のＵ相、Ｖ相、Ｗ相の各接続端子３５がモータハウジング２１の内部に挿入され、ターミナル３４の各コイル３３への接続部に接続される。   2 to 4, the stator 30 is incorporated and fixed on the inner periphery of the motor housing 21 as will be described later. In this embodiment, for example, each of the U phase, V phase, and W phase is fixed. Each core assembly 30A includes four core assemblies 30B (12 in total) arranged adjacent to each other on the circumference. The core assembly 30B is formed by laminating a core 31 made of a plurality of silicon steel plates, a resin bobbin 32 is attached to the laminated core 31, and three phases of a U phase, a V phase, and a W phase are provided on a coil winding portion of the bobbin 32. Each motor coil 33 is formed by winding. In the present embodiment, each coil 33 is energized via a terminal 34 attached to the bobbin 32, and a connection terminal 35 that supplies power to the terminal 34 is drawn out of the motor housing 21 via a plug (coupler) 36. In other words, the U-phase, V-phase, and W-phase connection terminals 35 of the plug 36 are inserted into the motor housing 21 and connected to the connection portions of the terminals 34 to the coils 33.

回転子４０は、図２、図３に示す如く、モータハウジング２１の長手方向に渡ってラック軸１６の周囲に配置される中空回転軸４１を有し、回転軸４１の一端部には後述するボールナット５２が固定され、このボールナット５２はギヤハウジング１３のベアリング４２Ａに圧入されて軸支され、回転軸４１の他端部は第２ハウジング部１４のベアリング４２Ｂに圧入されて軸支される。回転軸４１の外周で固定子３０に臨む位置には回転子マグネット４３がマグネットホルダ４４を介して周方向に位置決めされ固定されている。   2 and 3, the rotor 40 has a hollow rotating shaft 41 disposed around the rack shaft 16 over the longitudinal direction of the motor housing 21, and one end portion of the rotating shaft 41 will be described later. A ball nut 52 is fixed. The ball nut 52 is press-fitted into a bearing 42A of the gear housing 13 and is pivotally supported. The other end of the rotary shaft 41 is press-fitted into a bearing 42B of the second housing portion 14 and is pivotally supported. . A rotor magnet 43 is positioned and fixed in the circumferential direction via a magnet holder 44 at a position facing the stator 30 on the outer periphery of the rotating shaft 41.

電動パワーステアリング装置１０は、図２に示す如く、ラック軸１６にボールねじ５１を設けてあり、ボールねじ５１に噛み合うボールナット５２を前述の回転軸４１の一端部に固定している。ボールねじ５１のねじ溝とボールナット５２のねじ溝の間にスチールボール５３を保持し、ボールナット５２の回転をボールねじ５１によりラック軸１６の直線移動に変換する。   As shown in FIG. 2, the electric power steering apparatus 10 is provided with a ball screw 51 on the rack shaft 16, and a ball nut 52 that meshes with the ball screw 51 is fixed to one end of the rotary shaft 41. A steel ball 53 is held between the screw groove of the ball screw 51 and the screw groove of the ball nut 52, and the rotation of the ball nut 52 is converted into linear movement of the rack shaft 16 by the ball screw 51.

レゾルバ６０は、図２、図３に示す如く、固定子３０に対して一定の周方向位置に組付けられるレゾルバステータ６１と、回転子４０に対して一定の周方向位置に組付けられるレゾルバロータ７１とからなる。レゾルバロータ７１は、複数の突極を周方向に配置した環状コアから構成されている。レゾルバステータ６１は、樹脂製の環状ブラケット６２に保持される積層鉄芯６３に巻線を巻き回したコイル６４を有し、コイル６４を形成する巻線はプラグ６５からモータハウジング２１側の外側に引き出される。レゾルバステータ６１は、回転子４０の回転軸４１とともに回転するレゾルバロータ７１を囲むように配置され、この回転によってレゾルバロータ７１との間で生ずるリラクタンスの変化により、回転軸４１の回転位置を検出する。検出した回転軸４１の回転位置に応じて、外部の制御回路により、固定子３０のＵ相、Ｖ相、Ｗ相の各コイル３３に所定の電流を供給し、モータ２０を駆動制御する。本実施例では、レゾルバ６０が、第２ハウジング部１４に組付けられるレゾルバステータ６１と、回転子４０が設けられる回転軸４１に組付けられるレゾルバロータ７１とからなる。   As shown in FIGS. 2 and 3, the resolver 60 includes a resolver stator 61 assembled at a fixed circumferential position with respect to the stator 30 and a resolver rotor assembled at a fixed circumferential position with respect to the rotor 40. 71. The resolver rotor 71 is composed of an annular core having a plurality of salient poles arranged in the circumferential direction. The resolver stator 61 has a coil 64 in which a winding is wound around a laminated iron core 63 held by a resin-made annular bracket 62, and the winding forming the coil 64 extends from the plug 65 to the outside on the motor housing 21 side. Pulled out. The resolver stator 61 is disposed so as to surround a resolver rotor 71 that rotates together with the rotation shaft 41 of the rotor 40, and detects the rotation position of the rotation shaft 41 by a change in reluctance generated between the resolver stator 61 and the resolver rotor 71. . A predetermined current is supplied to each of the U-phase, V-phase, and W-phase coils 33 of the stator 30 according to the detected rotational position of the rotating shaft 41 to drive-control the motor 20. In the present embodiment, the resolver 60 includes a resolver stator 61 assembled to the second housing portion 14 and a resolver rotor 71 assembled to the rotating shaft 41 provided with the rotor 40.

しかるに、本実施例では、コア組立体３０Ａをモータハウジング２１に組付けるため以下の構成を具備する。   However, in this embodiment, the following configuration is provided for assembling the core assembly 30 </ b> A to the motor housing 21.

即ち、固定子３０を構成するコア組立体３０Ａにあっては、図４に示す如く、各コア小組体３０Ｂの積層コア３１の外周をモータハウジング２１の内周に隙間嵌めし、コア３１の積層方向の一端をモータハウジング２１の内周の一端側（モータハウジング２１の第１ハウジング部１３が取付けられる側に対する反対側）に設けた段差状のストッパ２１Ａに突き当て、コア３１の積層方向の他端をモータハウジング２１の内周の他端に圧入して固定したリング状の固定具８０により支持する。コア組立体３０Ａの積層コア３１はモータハウジング２１の第１ハウジング部１３が取付けられる側の開口部から挿入され、固定具８０はモータハウジング２１のこの開口部から圧入され、積層コア３１をストッパ２１Ａと固定具８０の間に挟圧して保持する。   That is, in the core assembly 30A constituting the stator 30, as shown in FIG. 4, the outer periphery of the laminated core 31 of each core subassembly 30B is fitted into the inner periphery of the motor housing 21 so that the core 31 is laminated. One end of the direction is abutted against a stepped stopper 21A provided on one end side of the inner periphery of the motor housing 21 (opposite side to the side on which the first housing portion 13 of the motor housing 21 is attached) The end is supported by a ring-shaped fixture 80 that is press-fitted into the other end of the inner periphery of the motor housing 21 and fixed. The laminated core 31 of the core assembly 30A is inserted from the opening of the motor housing 21 on the side where the first housing part 13 is attached, and the fixture 80 is press-fitted from this opening of the motor housing 21, and the laminated core 31 is inserted into the stopper 21A. And is held between the fixtures 80.

更に、コア組立体３０Ａの積層コア３１にあっては、各コア３１の一部（本実施例ではコア組立体３０Ａの中心軸を通る直径線に合致するコア３１の中心線上で、該コア３１の外周寄りに位置する部分）を積層方向に突き出るバネ部８１とする（図５）。バネ部８１はコア３１の本体の上述の一部をプレス成形することにより形成されたものであり、図５に示す如く、コア３１の外周の周方向に沿って横長Ｖ字折り曲げ状をなすバネ部８１の上下２本の横辺をコア３１の本体から切離するとともに、該バネ部８１の左右の両端部をコア３１の本体から曲げ起こし、該バネ部８１の左右の中央部をコア３１の中心線上でＶ字折り曲げの頂点とする（バネ部８１はコア３１の中心線に対して線対称をなす）。そして、モータハウジング２１に隙間嵌めされたコア組立体３０Ａにあっては、積層方向の最も外側に位置するコア３１のバネ部８１をモータハウジング２１のストッパ２１Ａ（モータハウジング２１に圧入される固定具８０の端面でも可）に弾発的に衝合させる。このとき、コア３１のバネ部８１に付与すべき弾発的撓み量は、高温時に伸びるモータハウジング２１の軸方向に対してもコア３１を弾発的に保持し得る弾性変形代を維持し、かつ低温時に縮むモータハウジング２１の応力が過大にならないように該モータハウジング２１の縮み代を吸収し得る撓み量とする。これにより、コア組立体３０Ａの積層コア３１はストッパ２１Ａと固定具８０の間に常に安定的に挟圧されて固定され、モータハウジング２１の内周において安定的に保持される。   Further, in the laminated core 31 of the core assembly 30A, a part of each core 31 (in this embodiment, the core 31 on the center line of the core 31 that matches the diameter line passing through the central axis of the core assembly 30A). The portion located closer to the outer periphery of the substrate is defined as a spring portion 81 protruding in the stacking direction (FIG. 5). The spring portion 81 is formed by press-molding the above-mentioned part of the main body of the core 31, and as shown in FIG. 5, the spring is formed into a horizontally long V-shaped bent shape along the circumferential direction of the outer periphery of the core 31. The upper and lower two horizontal sides of the portion 81 are separated from the main body of the core 31, the left and right end portions of the spring portion 81 are bent from the main body of the core 31, and the left and right central portions of the spring portion 81 are (The spring part 81 is line-symmetric with respect to the center line of the core 31). In the core assembly 30A that is fitted in the motor housing 21 with a gap, the spring portion 81 of the core 31 that is located on the outermost side in the stacking direction is inserted into the stopper 21A of the motor housing 21 (the fixing tool that is press-fitted into the motor housing 21). (Even if the end face of 80 is acceptable) At this time, the amount of elastic deflection to be applied to the spring portion 81 of the core 31 maintains an elastic deformation allowance that can elastically hold the core 31 in the axial direction of the motor housing 21 that extends at high temperatures, In addition, the amount of bending that can absorb the shrinkage allowance of the motor housing 21 is set so that the stress of the motor housing 21 that shrinks at a low temperature does not become excessive. Thereby, the laminated core 31 of the core assembly 30 </ b> A is always stably clamped and fixed between the stopper 21 </ b> A and the fixture 80, and is stably held on the inner periphery of the motor housing 21.

尚、コア３１の外周の周方向の中央部には凹溝３１Ａが設けられている（凹溝３１Ａはコア３１の中心線に関して線対称をなす）。そして、ブラシレスモータ２０にあっては、コア組立体３０Ａをモータハウジング２１へ隙間嵌めするとき、モータハウジング２１を中心軸まわりの一定角度位置に保持するとともに、コア組立体３０Ａをモータハウジング２１の中心軸上にセットし、このコア組立体３０Ａの各コア３１の凹溝３１Ａを、モータハウジング２１に対し同軸かつ所定の角度位置関係をなして配置されているコア押込治具の押込部に係合させる。そして、コア押込治具をモータハウジング２１の軸方向に押込動作することにより、コア組立体３０Ａがモータハウジング２１に対して所定の角度位置関係を確保された状態で、コア組立体３０Ａの各コア小組体３０Ｂの積層コア３１がモータハウジング２１の内周にスムースに圧入される。   A concave groove 31 </ b> A is provided at the circumferential center of the outer periphery of the core 31 (the concave groove 31 </ b> A is axisymmetric with respect to the center line of the core 31). In the brushless motor 20, when the core assembly 30 </ b> A is fitted into the motor housing 21 with a gap, the motor housing 21 is held at a certain angular position around the central axis, and the core assembly 30 </ b> A is held at the center of the motor housing 21. Set on the shaft, and engage the recessed groove 31A of each core 31 of the core assembly 30A with the pushing portion of the core pushing jig arranged coaxially with the motor housing 21 and in a predetermined angular positional relationship. Let Then, by pressing the core pushing jig in the axial direction of the motor housing 21, each core of the core assembly 30 </ b> A is maintained in a state in which the core assembly 30 </ b> A has a predetermined angular positional relationship with the motor housing 21. The laminated core 31 of the small assembly 30 </ b> B is smoothly press-fitted into the inner periphery of the motor housing 21.

固定子３０を構成するコア３１は、凹溝３１Ａ、バネ部８１を備えていても、固定子３０の磁気回路を損なうことのないように、コア３１の中心線に対して線対称をなす。   Even if the core 31 constituting the stator 30 includes the concave groove 31A and the spring portion 81, the core 31 is axisymmetric with respect to the center line of the core 31 so as not to damage the magnetic circuit of the stator 30.

以下、電動パワーステアリング装置１０の動作について説明する。
(1)操舵トルク検出装置が検出した操舵トルクが所定値より低いとき、操舵アシスト力は不要であり、電動モータ２０は駆動されない。 Hereinafter, the operation of the electric power steering apparatus 10 will be described.
(1) When the steering torque detected by the steering torque detection device is lower than a predetermined value, the steering assist force is unnecessary and the electric motor 20 is not driven.

(2)操舵トルク検出装置が検出した操舵トルクが所定値を越えるとき、操舵アシスト力を必要とするから、電動モータ２０が駆動される。電動モータ２０では、必要な操舵アシスト力を発生するように固定子３０のコイル３３に通電し、固定子３０に発生する磁界によって回転子４０が回転するように駆動される。モータ２０の発生トルクは回転子４０から回転軸４１を介してボールナット５２に伝えられ、ボールナット５２の回転をボールねじ５１によりラック軸１６の直線運動とし、ラック軸１６に連動する車輪に操舵アシスト力として付与される。   (2) Since the steering assist force is required when the steering torque detected by the steering torque detection device exceeds a predetermined value, the electric motor 20 is driven. In the electric motor 20, the coil 33 of the stator 30 is energized so as to generate a necessary steering assist force, and the rotor 40 is driven to rotate by a magnetic field generated in the stator 30. The generated torque of the motor 20 is transmitted from the rotor 40 to the ball nut 52 via the rotation shaft 41, and the rotation of the ball nut 52 is converted into a linear motion of the rack shaft 16 by the ball screw 51, and the wheels linked to the rack shaft 16 are steered. It is given as assist power.

本実施例によれば以下の作用効果を奏する。
(a)モータハウジング２１とコア３１の線膨長係数の違いにより、モータハウジング２１とコア３１の積層方向に生ずるガタをコア３１のバネ部８１の弾性撓み量により吸収する。コア３１をモータハウジング２１に焼き嵌めすることなく簡易に組付け、しかもモータハウジング２１に過大応力を生じさせないから該モータハウジング２１に強度材料を適用する必要もなく、コア３１をモータハウジング２１の内周に確実に固定できる。皿バネ等の別部品を必要とせず、コア３１の組付構造を簡略化できる。 According to the present embodiment, the following operational effects can be obtained.
(a) The backlash generated in the stacking direction of the motor housing 21 and the core 31 due to the difference in coefficient of linear expansion between the motor housing 21 and the core 31 is absorbed by the amount of elastic deflection of the spring portion 81 of the core 31. The core 31 can be easily assembled without being shrink-fitted into the motor housing 21. Further, since no excessive stress is generated in the motor housing 21, there is no need to apply a strength material to the motor housing 21, and the core 31 is placed inside the motor housing 21. Can be securely fixed to the circumference. A separate structure such as a disc spring is not required, and the assembly structure of the core 31 can be simplified.

(b)電動パワーステアリング装置１０において、上述(a)を実現できる。   (b) In the electric power steering apparatus 10, the above-described (a) can be realized.

以上、本発明の実施例を図面により詳述したが、本発明の具体的な構成はこの実施例に限られるものではなく、本発明の要旨を逸脱しない範囲の設計の変更等があっても本発明に含まれる。例えば、積層コアの各コアのそれぞれに複数個のバネ部を設けても良い。このとき、複数個のバネ部は、固定子の磁気回路を損なうことのないように、当該コアの中心線に対して互いに線対称をなす位置に設けられる。   Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration of the present invention is not limited to these embodiments, and even if there is a design change or the like without departing from the gist of the present invention. It is included in the present invention. For example, you may provide a some spring part in each of each core of a lamination | stacking core. At this time, the plurality of spring portions are provided at positions that are symmetrical with respect to the center line of the core so as not to damage the magnetic circuit of the stator.

また、ハウジングの内周の一端側に設けられるストッパは、ハウジングと単一物をなす段差状ストッパに限らず、ハウジングに圧入等されて固定される別物のリング体等により形成されても良いし、ハウジングの一部をカシメて係合させても良い。   Further, the stopper provided on one end of the inner periphery of the housing is not limited to the stepped stopper that forms a single object with the housing, but may be formed by a separate ring body that is press-fitted into the housing and fixed. A part of the housing may be crimped and engaged.

図１は電動パワーステアリング装置を示す全体図である。FIG. 1 is an overall view showing an electric power steering apparatus. 図２は図１の要部断面図である。FIG. 2 is a cross-sectional view of the main part of FIG. 図３はブラシレスモータを示す断面図である。FIG. 3 is a cross-sectional view showing the brushless motor. 図４は図３のIV部を拡大して示す断面図である。FIG. 4 is an enlarged sectional view showing a portion IV in FIG. 図５は積層コアを示す斜視図である。FIG. 5 is a perspective view showing a laminated core.

符号の説明Explanation of symbols

１０ 電動パワーステアリング装置
２０ ブラシレスモータ
２１ モータハウジング（ハウジング）
２１Ａ ストッパ
３０ 固定子
３１ コア
４０ 回転子
４１ 回転軸
８０ 固定具
８１ バネ部 10 Electric Power Steering Device 20 Brushless Motor 21 Motor Housing (Housing)
21A Stopper 30 Stator 31 Core 40 Rotor 41 Rotating shaft 80 Fixing tool 81 Spring portion

Claims (2)

ハウジングに固定子を固定し、固定子の内周側に回転可能に配置される回転軸に回転子を設けてなるブラシレスモータにおいて、
固定子を構成するように積層されるコアの外周をハウジングの内周に隙間嵌めし、該コアの積層方向の一端をハウジングの内周の一端側に設けたストッパに突き当て、該コアの積層方向の他端をハウジングの内周の他端側に固定した固定具により支持するに際し、該コアの一部を積層方向に突き出るバネ部とし、積層方向の最も外側に位置するコアのバネ部を上記のストッパと固定具の一方に弾発的に衝合させてなることを特徴とするブラシレスモータ。 In a brushless motor in which a stator is fixed to a housing and a rotor is provided on a rotating shaft that is rotatably arranged on the inner peripheral side of the stator.
The outer periphery of the cores stacked to constitute the stator is fitted into the inner periphery of the housing with a gap, and one end in the stacking direction of the core is abutted against a stopper provided on one end side of the inner periphery of the housing. When the other end in the direction is supported by a fixture fixed to the other end of the inner periphery of the housing, a part of the core is used as a spring portion protruding in the stacking direction, and the spring portion of the core located on the outermost side in the stacking direction is A brushless motor characterized by elastically abutting one of the stopper and the fixture. 請求項１に記載のブラシレスモータを用いた電動パワーステアリング装置。   An electric power steering apparatus using the brushless motor according to claim 1.
JP2007197871A 2007-07-30 2007-07-30 Brushless motor Expired - Fee Related JP5037257B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009067318A (en) * 2007-09-14 2009-04-02 Nsk Ltd Motor for electric power steering device
CN111418130A (en) * 2017-11-29 2020-07-14 西门子股份公司 Fastening of a stator in a housing by means of elastic elements

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54104905U (en) * 1978-01-10 1979-07-24
JP2004201495A (en) * 2002-12-16 2004-07-15 Robert Bosch Gmbh Electric machine
JP2006027355A (en) * 2004-07-13 2006-02-02 Nsk Ltd Electric power steering device
JP2006333657A (en) * 2005-05-27 2006-12-07 Mitsuba Corp Motor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54104905U (en) * 1978-01-10 1979-07-24
JP2004201495A (en) * 2002-12-16 2004-07-15 Robert Bosch Gmbh Electric machine
JP2006027355A (en) * 2004-07-13 2006-02-02 Nsk Ltd Electric power steering device
JP2006333657A (en) * 2005-05-27 2006-12-07 Mitsuba Corp Motor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009067318A (en) * 2007-09-14 2009-04-02 Nsk Ltd Motor for electric power steering device
CN111418130A (en) * 2017-11-29 2020-07-14 西门子股份公司 Fastening of a stator in a housing by means of elastic elements
US11705765B2 (en) 2017-11-29 2023-07-18 Siemens Aktiengesellschaft Mounting a stator in a housing using spring elements

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