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JP3843097B2 - Coreless motor - Google Patents

Coreless motor Download PDF

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Publication number
JP3843097B2
JP3843097B2 JP2003371652A JP2003371652A JP3843097B2 JP 3843097 B2 JP3843097 B2 JP 3843097B2 JP 2003371652 A JP2003371652 A JP 2003371652A JP 2003371652 A JP2003371652 A JP 2003371652A JP 3843097 B2 JP3843097 B2 JP 3843097B2
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motor housing
shaft
field magnet
bearing
opening
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JP2005137146A (en
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学 白木
建華 王
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株式会社シコー技研
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Description

本発明は、コアレスモ−タに関する。   The present invention relates to a coreless motor.

かかるコアレスモータとして、特許文献１には円筒形状のモータハウジングと、その内側の空間に配置された界磁マグネットと、シャフトと、シャフトの軸受けとを備え、環状の界磁マグネットの中空内に軸受けを設けた技術が開示されている。   As such a coreless motor, Patent Literature 1 includes a cylindrical motor housing, a field magnet disposed in a space inside the cylindrical motor housing, a shaft, and a bearing of the shaft, and a bearing in the hollow of the annular field magnet. The technique which provided is disclosed.

実開平５−２５５７号公報Japanese Utility Model Publication No. 5-2557

特許文献１に記載された従来技術は、界磁マグネットの中空内に設けた軸受けで、シャフトの軸方向の力を受けているが、シャフトの半径方向の力を受けるため、コイルとシャフトの外周面との間にもシャフトの軸受けを設ける必要があった。そのため部品点数が多くなり、コスト高になるとともに、軸受けの組み付けに手間がかかるという問題がある。   The prior art described in Patent Document 1 is a bearing provided in the hollow of the field magnet, and receives the axial force of the shaft, but receives the force in the radial direction of the shaft. It was necessary to provide a shaft bearing between the surfaces. Therefore, there are problems that the number of parts increases, the cost increases, and it takes time to assemble the bearings.

本発明は、部品点数を減らし且つ組み付けを簡略化して低コスト化を図ることができるコアレスモ−タを提供することを目的とする。   An object of the present invention is to provide a coreless motor capable of reducing the number of parts and simplifying the assembly to reduce the cost.

前記課題を解決するために、請求項１に記載された発明は、磁性体からなる円筒形のモ−タハウジングと、モ−タハウジング内に配置された環状の界磁マグネットと、シャフトと、シャフトの軸受けとを備え、モ−タハウジングの底部には開口部を有し、底部の開口部から界磁マグネットの中空内に充填した樹脂材で開口部を塞ぐと共に樹脂材がシャフトの一端を受ける軸受けを形成していることを特徴とする。   In order to solve the above-mentioned problem, the invention described in claim 1 includes a cylindrical motor housing made of a magnetic material, an annular field magnet disposed in the motor housing, a shaft, The motor housing has an opening at the bottom of the motor housing, and the opening is closed with a resin material filled in the hollow of the field magnet from the opening at the bottom, and the resin material covers one end of the shaft. It is characterized by forming a bearing.

請求項２に記載された発明は、請求項１に記載の発明において、軸受けは環状の界磁マグネットの端面から中空の径よりも大きな径として突出していることを特徴とする。   The invention described in claim 2 is characterized in that, in the invention described in claim 1, the bearing protrudes from the end face of the annular field magnet as a diameter larger than the hollow diameter.

請求項３に記載された発明は、請求項１又は２に記載の発明において、モ−タハウジングの底部と界磁マグネットとの間の隙間にも樹脂材を充填していることを特徴とする。   According to a third aspect of the present invention, in the first or second aspect of the present invention, the gap between the bottom of the motor housing and the field magnet is filled with a resin material. .

請求項４に記載された発明は、請求項１〜３の何れか一項に記載の発明において、モータハウジングの底部に形成されている開口部は底部の外側から内側に向けて幅狭になったテーパ形状であることを特徴とする。   According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the opening formed in the bottom portion of the motor housing becomes narrower from the outside to the inside. It is characterized by having a tapered shape.

請求項１に記載の発明によれば、モータハウジングの底部に設けた開口部から界磁マグネットの中空内に充填した樹脂材で、シャフトの一端を受ける軸受けを形成しているので、別途に軸受けの部品を必要とせず、部品点数を少なくできると共に軸受けの組み付けを必要としないので、コアレスモータの組み付けを簡略化できる。よって、低コスト化を図ることができる。   According to the first aspect of the present invention, the bearing for receiving one end of the shaft is formed by the resin material filled in the hollow of the field magnet from the opening provided in the bottom of the motor housing. No parts are required, the number of parts can be reduced, and the assembly of the bearing is not required, so that the assembly of the coreless motor can be simplified. Therefore, cost reduction can be achieved.

請求項２に記載された発明によれば、請求項１に記載された発明と同様の効果が得られるとともに、シャフトの一端を受ける軸受けは、環状の界磁マグネットの端面から、中空の径よりも大きな径として突出して設けているので、シャフトの一端を界磁マグネットの端面より外側で受けることができ、シャフトが中空内に入り込まず、中空の径を小さくできる。よって、界磁マグネットの径を小さくでき、コアレスモータ全体の小型化を図ることができる。   According to the second aspect of the present invention, the same effect as that of the first aspect of the invention can be obtained, and the bearing that receives one end of the shaft can have a hollow diameter from the end face of the annular field magnet. Also, since one end of the shaft can be received outside the end face of the field magnet, the shaft does not enter the hollow, and the hollow diameter can be reduced. Therefore, the diameter of the field magnet can be reduced, and the entire coreless motor can be reduced in size.

請求項３に記載された発明によれば、請求項１又は２に記載された発明と同様の効果が得られるとともに、モータハウジングと界磁マグネットとを樹脂材で固定できる。   According to the invention described in claim 3, the same effect as that of the invention described in claim 1 or 2 can be obtained, and the motor housing and the field magnet can be fixed by the resin material.

請求項４に記載された発明によれば、請求項１〜３の何れか一項に記載された発明と同様の効果が得られるとともに、開口部は底部の外側から内側に向けて幅狭になったテーパ形状になっているので、テーパに沿って樹脂材をスムーズに充填できる。   According to the invention described in claim 4, the same effect as that of the invention described in any one of claims 1 to 3 can be obtained, and the opening is made narrower from the outside toward the inside. Since the tapered shape is formed, the resin material can be smoothly filled along the taper.

以下、図面を参照しながら本発明の一実施形態について説明する。図１は本発明に係るコアレスモータの概略を示す断面図である。   Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view schematically showing a coreless motor according to the present invention.

図１に示すように、本実施の形態に係るコアレスモータ１は、円筒形のモ−タハウジング３と、モ−タハウジング３内に配置された界磁マグネット５と、シャフト１１とを備えている。   As shown in FIG. 1, the coreless motor 1 according to the present embodiment includes a cylindrical motor housing 3, a field magnet 5 disposed in the motor housing 3, and a shaft 11. Yes.

界磁マグネット５とモ−タハウジング３との間の隙間にはコイル７が配置されており、コイル７の一端側には整流子ハブ１０が固定されている。またモータハウジング３の先端側にはモータハウジング３の端を塞ぐとともにシャフト１１の軸受けの役割を果たす軸受け部１５を備えている。   A coil 7 is disposed in a gap between the field magnet 5 and the motor housing 3, and a commutator hub 10 is fixed to one end side of the coil 7. Further, a bearing portion 15 that closes the end of the motor housing 3 and serves as a bearing for the shaft 11 is provided on the front end side of the motor housing 3.

モ−タハウジング３は、磁性体でできており、モ−タハウジング３の底部１６の厚みは側部１９の厚みよりも大きく設けられている。また底部１６には底部の外側部分が広口となった開口部１７が形成されており、この開口部１７から樹脂材６が充填されるようになっている。   The motor housing 3 is made of a magnetic material, and the thickness of the bottom portion 16 of the motor housing 3 is larger than the thickness of the side portion 19. In addition, the bottom portion 16 is formed with an opening portion 17 having an outer portion of the bottom portion having a wide mouth, and the resin material 6 is filled from the opening portion 17.

界磁マグネット５は環状であり、上記モ−タハウジング３の開口部１７から樹脂材６が中空２１内に充填されて、樹脂材６が固化することにより界磁マグネット５がモータハウジング３に対して固定されるようになっている。尚、界磁マグネット５は回転方向に連続したものに限らず、回転方向に非連続にマグネットを配置したものであっても良い。   The field magnet 5 is annular, and the resin material 6 is filled into the hollow 21 from the opening 17 of the motor housing 3, and the resin material 6 is solidified to cause the field magnet 5 to move relative to the motor housing 3. To be fixed. The field magnet 5 is not limited to one that is continuous in the rotation direction, but may be one in which magnets are discontinuously arranged in the rotation direction.

界磁マグネット５の中空２１内に充填された樹脂材６は、さらに中空２１の一方の端面から中空の径よりも大きな径として断面視略コ字状の突出部分を形成している。   The resin material 6 filled in the hollow 21 of the field magnet 5 further forms a protruding portion having a substantially U-shape in cross section as a diameter larger than the hollow diameter from one end face of the hollow 21.

この突出部分は、シャフト１１側の面が凹部２０となり、シャフト１１の一端を受ける軸受け６ａとなっている。尚、軸受け６ａの凹部２０の内径はシャフト１１の外径よりもわずかに大きく形成しており、シャフト１１が軸受け６ａの凹部２０において自由に回転できるようになっている。   The protruding portion has a recess 20 on the surface on the shaft 11 side and serves as a bearing 6 a that receives one end of the shaft 11. The inner diameter of the recess 20 of the bearing 6a is slightly larger than the outer diameter of the shaft 11, so that the shaft 11 can freely rotate in the recess 20 of the bearing 6a.

また、モ−タハウジング３の開口部１７から充填した樹脂材６は、モータハウジング３の底部１６と界磁マグネット５の他方の端面との間の隙間部６ｃにも充填され、モータハウジング３と界磁マグネット５とを固定している。そして、樹脂材６で形成した軸受け６ａ及び隙間部６ｃの直径は、中空２１の直径よりも大きく設けられており、軸受け６ａ及び隙間部６ｃで界磁マグネット５を両側から挟んで固定するようになっている。   In addition, the resin material 6 filled from the opening 17 of the motor housing 3 is also filled in the gap 6c between the bottom 16 of the motor housing 3 and the other end face of the field magnet 5, The field magnet 5 is fixed. The diameters of the bearing 6a and the gap 6c formed of the resin material 6 are larger than the diameter of the hollow 21, and the field magnet 5 is sandwiched and fixed by the bearing 6a and the gap 6c from both sides. It has become.

コイル７は、その一端部を整流子ハブ１０の外周に接着剤等の手段を用いて固定している。整流子ハブ１０は、樹脂にて形成されており、外周に整流子群からなる整流子９を設けている。   One end of the coil 7 is fixed to the outer periphery of the commutator hub 10 using means such as an adhesive. The commutator hub 10 is formed of resin, and a commutator 9 including a commutator group is provided on the outer periphery.

軸受け部１５は樹脂製であり、モータハウジング３の一端側に圧入にて装着するようになっている。また、軸受け部１５の内側には凹部２３が形成されており、凹部２３に整流子ハブ１０の先端部が入り込むようになっている。軸受け部１５の凹部２３の入口部分には一対のブラシ保持部２５、２５が軸受け部１５と一体成形に設けられている。そして、各ブラシ保持部２５、２５には一対のブラシ２７、２７を装着し、ブラシ２７、２７をその対向位置にある整流子９に摺接させている。一方のブラシ２７はリード線を介して正極電源端子に電気的に接続され、他方のブラシ２７はリード線を介して負極電源端子に電気的に接続されている。   The bearing portion 15 is made of resin, and is attached to one end side of the motor housing 3 by press fitting. Further, a recess 23 is formed inside the bearing portion 15 so that the tip of the commutator hub 10 enters the recess 23. A pair of brush holding portions 25, 25 are provided integrally with the bearing portion 15 at the entrance portion of the recess portion 23 of the bearing portion 15. A pair of brushes 27, 27 are attached to each brush holding portion 25, 25, and the brushes 27, 27 are brought into sliding contact with the commutator 9 at the opposing position. One brush 27 is electrically connected to the positive power supply terminal via a lead wire, and the other brush 27 is electrically connected to the negative power supply terminal via a lead wire.

シャフト１１は、その先端（他端）に偏心分銅２９が設けられており、モータハウジング３の一端側に装着された軸受け部１５において、シャフト１１の中央部分を受けている。また、界磁マグネット５の中空２１内から突出した位置に設けた軸受け６ａにおいてシャフト１１の一端を受けるようにしている。また、シャフト１１は整流子ハブ１０のシャフト通し孔１３内に設けられた突起部３１が、シャフト１１側の凹部３２に嵌合することで、シャフト１１の軸回りの回転を規制している。   The shaft 11 is provided with an eccentric weight 29 at the tip (the other end) thereof, and receives a central portion of the shaft 11 at a bearing portion 15 attached to one end side of the motor housing 3. Further, one end of the shaft 11 is received by a bearing 6 a provided at a position protruding from the hollow 21 of the field magnet 5. Further, the shaft 11 restricts the rotation of the shaft 11 around the axis by fitting a projection 31 provided in the shaft through hole 13 of the commutator hub 10 into the recess 32 on the shaft 11 side.

次に、本実施の形態にかかるコアレスモータ１の製造方法及びその作用効果について説明する。コアレスモータ１の製造方法は、一度の射出成型によりモータハウジング３に対する界磁マグネット５の固定と、シャフト１１の一端を受ける軸受け６ａの形成とを同時に行なっている。   Next, the manufacturing method of the coreless motor 1 concerning this Embodiment and its effect are demonstrated. In the manufacturing method of the coreless motor 1, the field magnet 5 is fixed to the motor housing 3 and the bearing 6 a that receives one end of the shaft 11 is simultaneously formed by a single injection molding.

即ち、射出成型装置に配置された金型に、界磁マグネット５及びモータハウジング３をセットし、モータハウジング３の底部１６に設けた開口部１７から流動化した樹脂材６を充填する。樹脂材６は、底部１６の開口部１７から界磁マグネット５の中空２１を通過し、界磁マグネット５の中空２１の端面から中空２１の径よりも大きな径として突出した位置に充填される。このように、樹脂材６の充填作業によりシャフト１１の一端を受ける軸受け６ａが形成される。   That is, the field magnet 5 and the motor housing 3 are set in a mold disposed in the injection molding apparatus, and the fluidized resin material 6 is filled from the opening 17 provided in the bottom 16 of the motor housing 3. The resin material 6 passes through the hollow 21 of the field magnet 5 from the opening 17 of the bottom portion 16 and is filled in a position protruding from the end surface of the hollow 21 of the field magnet 5 as a diameter larger than the diameter of the hollow 21. Thus, the bearing 6a which receives the end of the shaft 11 by the filling operation of the resin material 6 is formed.

また、底部１６の開口部１７から注入された樹脂材６は、モータハウジング３の底部１６と界磁マグネット５との間の隙間６ｃにも充填され、樹脂材６を介してモータハウジング３と界磁マグネット５とが固定される。   The resin material 6 injected from the opening 17 of the bottom portion 16 is also filled in the gap 6 c between the bottom portion 16 of the motor housing 3 and the field magnet 5, and the field between the motor housing 3 and the motor housing 3 is interposed via the resin material 6. The magnet 5 is fixed.

その後、モータハウジング３内にコイル７、整流子ハブ１０、シャフト１１、及び軸受け部１５の組付けが順次行なわれる。   Thereafter, the assembly of the coil 7, the commutator hub 10, the shaft 11, and the bearing portion 15 is sequentially performed in the motor housing 3.

モータハウジング３の底部１６に設けた開口部１７から界磁マグネット５の中空２１内に流し込んだ樹脂材６で、シャフト１１の一端を受ける軸受け６ａを形成しているので、別途に軸受け部品を必要とならず、部品点数が少なくてすみ、低コスト化を図ることができる。   Since the bearing 6a for receiving one end of the shaft 11 is formed by the resin material 6 poured into the hollow 21 of the field magnet 5 from the opening 17 provided in the bottom portion 16 of the motor housing 3, a separate bearing component is required. Therefore, the number of parts can be reduced and the cost can be reduced.

また、軸受けの組み付けを必要としないので、コアレスモータ１の組み付けが簡単であり、コアレスモータ１の製造時間の短縮化を図ることで、低コスト化を図ることができる。   In addition, since the assembly of the bearing is not required, the assembly of the coreless motor 1 is easy, and the cost can be reduced by shortening the manufacturing time of the coreless motor 1.

次に、図２を用いて他の実施の形態を説明するが、その説明にあたり上述した第１実施の形態に示す部分と同一の作用効果を奏する部分には、同一の符号を付することにより、その部分の詳細な説明を省略し、以下の説明では、主に第１実施の形態と異なる点を説明する。   Next, another embodiment will be described with reference to FIG. 2. In the description, parts having the same operational effects as those shown in the first embodiment described above are denoted by the same reference numerals. Detailed description of the portion will be omitted, and the following description will mainly focus on differences from the first embodiment.

第２の実施形態では、開口部１７をモータハウジング３の外側から内側に向けて幅狭になったテーパ形状にしている。   In the second embodiment, the opening 17 has a tapered shape that becomes narrower from the outside to the inside of the motor housing 3.

このように、開口部１７を外側から内側に向けて幅狭になったテーパ形状にしているので、テーパに沿って底部１６の開口部１７から樹脂材６を充填でき、充填作業をスムーズに行なうことができる。   Thus, since the opening part 17 is made into the taper shape which became narrow toward the inside from the outer side, the resin material 6 can be filled from the opening part 17 of the bottom part 16 along a taper, and a filling operation | work is performed smoothly. be able to.

なお、本発明は上述した実施の形態に限定されず、その要旨を逸脱しない範囲で種々の変形が可能である。上述の実施の形態において、モータハウジング３の底部１６に設けた開口部１７は外側から内側に向けて平坦になった形状であっても良い。   The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. In the above-described embodiment, the opening 17 provided in the bottom 16 of the motor housing 3 may have a shape that is flat from the outside to the inside.

上述の実施形態では、シャフト１１の先端に偏心分銅２９を設けたが、偏心分銅２９は設けなくても良い。   In the above-described embodiment, the eccentric weight 29 is provided at the tip of the shaft 11, but the eccentric weight 29 may not be provided.

本発明に係るコアレスモータの概略を示す断面図である。It is sectional drawing which shows the outline of the coreless motor which concerns on this invention. 変形例に係るコアレスモータの概略を示す断面図である。It is sectional drawing which shows the outline of the coreless motor which concerns on a modification.

符号の説明Explanation of symbols

１ コアレスモータ
３ モータハウジング
５ 界磁マグネット
１１ シャフト
１６ 底部
１７ 開口部
２１ 中空
DESCRIPTION OF SYMBOLS 1 Coreless motor 3 Motor housing 5 Field magnet 11 Shaft 16 Bottom part 17 Opening part 21 Hollow

Claims (4)

磁性体からなる円筒形のモ−タハウジングと、モ−タハウジング内に配置された環状の界磁マグネットと、シャフトと、シャフトの軸受けとを備え、モ−タハウジングの底部には開口部を有し、底部の開口部から界磁マグネットの中空内に充填した樹脂材で開口部を塞ぐと共に樹脂材がシャフトの一端を受ける軸受けを形成していることを特徴とするコアレスモ−タ。   A cylindrical motor housing made of a magnetic material, an annular field magnet disposed in the motor housing, a shaft, and a shaft bearing are provided, and an opening is formed at the bottom of the motor housing. The coreless motor is characterized in that the opening is closed with a resin material filled in the hollow of the field magnet from the opening at the bottom and the resin material forms a bearing for receiving one end of the shaft. 軸受けは環状の界磁マグネットの端面から中空の径よりも大きな径として突出していることを特徴とする請求項１記載のコアレスモ−タ。   2. The coreless motor according to claim 1, wherein the bearing protrudes from the end face of the annular field magnet as a diameter larger than the hollow diameter. モ−タハウジングの底部と界磁マグネットとの間の隙間にも樹脂材を充填していることを特徴とする請求項１又は２に記載のコアレスモータ。   3. The coreless motor according to claim 1, wherein the gap between the bottom of the motor housing and the field magnet is filled with a resin material. モータハウジングの底部に形成されている開口部は底部の外側から内側に向けて幅狭になったテーパ形状であることを特徴とする請求項１〜３の何れか一項に記載のコアレスモータ。

The coreless motor according to any one of claims 1 to 3, wherein the opening formed in the bottom portion of the motor housing has a tapered shape that becomes narrower from the outside toward the inside.

JP2003371652A 2003-10-31 2003-10-31 Coreless motor Expired - Fee Related JP3843097B2 (en)

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JP3843097B2 true JP3843097B2 (en) 2006-11-08

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KR100722602B1 (en) 2005-09-16 2007-05-28 삼성전기주식회사 Vibration motor provided with a thin blocking body of a commutator's breakaway
JP5309897B2 (en) * 2008-10-30 2013-10-09 トヨタ自動車株式会社 Rotating electric machine

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