JP6686421B2 - Electric motor - Google Patents

Electric motor Download PDF

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JP6686421B2
JP6686421B2 JP2015250600A JP2015250600A JP6686421B2 JP 6686421 B2 JP6686421 B2 JP 6686421B2 JP 2015250600 A JP2015250600 A JP 2015250600A JP 2015250600 A JP2015250600 A JP 2015250600A JP 6686421 B2 JP6686421 B2 JP 6686421B2
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motor
drainage passage
outer shell
outer peripheral
contact portion
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JP2017118664A (en
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祐樹 相澤
祐樹 相澤
紳一郎 片桐
紳一郎 片桐
田邉　洋一
洋一 田邉
利之 藤松
利之 藤松
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Fujitsu General Ltd
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Description

本発明は、回路基板に接続されたリード線をモータ外郭とブラケットとで覆われた内部から外部へ引出すためのブッシングを備えた電動機に関する。
The present invention relates to an electric motor including a bushing for drawing a lead wire connected to a circuit board from the inside covered with a motor outer shell and a bracket to the outside.

従来の電動機には、回転磁界を発生するステータの内部に、永久磁石を備えるロータを回転可能に配置したインナーロータ型の電動機がある。この型の電動機には、例えば、空気調和機の室外機に搭載される送風ファンを回転駆動するためのブラシレスＤＣモータがある。   2. Description of the Related Art As a conventional electric motor, there is an inner rotor type electric motor in which a rotor including a permanent magnet is rotatably arranged inside a stator that generates a rotating magnetic field. This type of electric motor includes, for example, a brushless DC motor for rotationally driving a blower fan mounted in an outdoor unit of an air conditioner.

このような電動機は、例えば、樹脂で形成されたモータ外郭で覆われたステータと、ロータと、回路基板と、ブラケットとを備えるとともに、この回路基板に接続されたリード線を、モータ外郭とブラケットとで覆われた内部から外部へ引出すためのブッシングを備えている。モータ外郭は、ブッシングが配置される回路基板側に、ロータの軸方向に対し垂直な端面と、この端面に連続形成されロータの軸方向に対し平行な外周面が形成されている。
Such an electric motor includes, for example, a stator covered with a motor outer shell formed of resin, a rotor, a circuit board, and a bracket, and a lead wire connected to the circuit board is connected to the motor outer shell and the bracket. It is equipped with a bushing for drawing from the inside covered with and to the outside. The motor outer shell has an end surface perpendicular to the axial direction of the rotor and an outer peripheral surface continuously formed on the end surface and parallel to the axial direction of the rotor on the side of the circuit board on which the bushing is arranged.

このブッシングは、例えば、リード線を両側から挟んで保持する一対の保持片を有するタイプのものがある（例えば、特許文献１）。この一対の保持片のうち、一方の保持片は略Ｌ字状に形成され、モータ外郭の端面に沿って当接される第１当接部と、モータ外郭の外周面に沿って当接される第２当接部を備えている。   This bushing has, for example, a type having a pair of holding pieces for holding the lead wire from both sides (for example, Patent Document 1). Of the pair of holding pieces, one holding piece is formed in a substantially L-shape, and is brought into contact with a first contact portion which is in contact with the end surface of the motor outer shell and an outer peripheral surface of the motor outer shell. The second contact portion is provided.

このようなブッシングを備えた電動機において、モータ外郭とブラケットとで覆われた内部に結露水などの水が発生した場合、発生した水をモータ外郭とブラケットとで覆われた内部から外部に水抜きする必要がある。このため、モータ外郭とブラケットとで覆われた内部の水抜き対策として、例えば、モータ外郭とブラケットとで覆われた内部と外部を連通する排水通路を、ブッシングの一方の保持片に備えた第１当接部から第２当接部に向かって形成することが考えられる。
In electric motor having such a bushing, when water such as dew condensation water in the interior covered with a motor shell and the bracket has occurred outside drainage of generated water from the interior covered with a motor shell and the bracket There is a need to. Therefore, as an internal drainage measures covered by the motor shell and the bracket, for example, the drainage passage communicating inside and outside covered with a motor shell and the bracket, provided on one of the holding pieces of the bushing It is possible to form from the 1st contact part toward the 2nd contact part.

しかしながら、例えば、空気調和機の室外機に搭載される電動機は、ブッシングの一方の保持片に形成される排水通路の大きさによっては、アリなどの小虫が排水通路からモータ外郭とブラケットとで覆われた内部に侵入し回路基板に備えた配線や部品のショートの原因になるおそれがあった。
However, for example, in the electric motor mounted in the outdoor unit of the air conditioner, small insects such as ants may be separated from the motor casing and the bracket from the drainage passage depending on the size of the drainage passage formed in one holding piece of the bushing. There is a risk that it may enter the covered interior and cause a short circuit in the wiring or parts provided on the circuit board.

特開２０１３−１３８５５１号公報JP, 2013-138551, A

本発明は上記問題点に鑑み、リード線を両側から挟んで保持する一対の保持片を有するタイプのブッシングを備えた電動機において、ブッシングに設けられた排水通路から小虫がモータ外郭とブラケットとで覆われた内部へ侵入するのを防止することができる電動機を提供することを目的とする。
In view of the above problems, the present invention is an electric motor including a bushing of a type having a pair of holding pieces for holding a lead wire from both sides, and in a drainage passage provided in the bushing, a worm is a motor shell and a bracket. It is an object of the present invention to provide an electric motor capable of preventing its entry into a covered interior.

上記課題を解決するために、本発明の電動機は、モータ外郭で覆われたステータと、ロータと、回路基板と、ブラケットとを備えるとともに、回路基板に接続されたリード線を、モータ外郭とブラケットとで覆われた内部から外部へ引出すためのブッシングを備え、モータ外郭は、ブッシングが配置される回路基板側にロータの軸方向に対し垂直に形成された端面と、この端面に連続するようにロータの軸方向に対し平行に形成された外周面とを備え、ブッシングは、リード線を挟んで保持する一対の保持片を有し、一対の保持片のうちの一方の保持片は、Ｌ字状に形成されるとともに、モータ外郭の端面に沿って形成されて端面に当接する第１当接部と、モータ外郭の外周面に沿って形成されて外周面に当接する第２当接部とを備え、第１当接部と第２当接部は、一方の保持片の幅方向中央に、第１当接部から第２当接部にわたって形成され、モータ外郭とブラケットとで覆われた内部で発生した水を排水するための排水通路を備え、排水通路は、第１当接部の端面との当接面から凹んだ第１排水通路と、第２当接部の外周面との当接面から凹んだ第２排水通路とを備え、第１排水通路の深さは第２排水通路の深さよりも深く形成され、第２排水通路の深さは小虫の侵入を阻止するために微小な深さに形成されていることを特徴とする。 In order to solve the above-mentioned problems, an electric motor of the present invention includes a stator covered with a motor outer shell, a rotor, a circuit board, and a bracket, and a lead wire connected to the circuit board is connected to the motor outer shell and the bracket. It is equipped with a bushing for drawing out from the inside covered with and to the outside, and the motor outer shell is connected to the end surface formed perpendicularly to the axial direction of the rotor on the circuit board side where the bushing is arranged, and to be continuous with this end surface An outer peripheral surface formed parallel to the axial direction of the rotor, the bushing has a pair of holding pieces for holding the lead wire, and one holding piece of the pair of holding pieces is L-shaped. A first contact portion that is formed into a shape and that is formed along the end surface of the motor outer shell and contacts the end surface, and a second contact portion that is formed along the outer peripheral surface of the motor outer shell and contacts the outer peripheral surface. Equipped with the first The contact portion and the second contact portion are formed in the widthwise center of one of the holding pieces from the first contact portion to the second contact portion, so that water generated inside the motor outer shell and the bracket is covered. A drainage passage for draining water is provided, and the drainage passage is recessed from a contact surface between the first contact portion and the end surface of the first contact portion, and a contact surface between the outer peripheral surface of the second contact portion and the first drain passage. A second drainage passage, wherein the depth of the first drainage passage is formed deeper than the depth of the second drainage passage, and the depth of the second drainage passage is set to a minute depth to prevent invasion of small insects. It is characterized by being formed.

本発明の電動機によれば、リード線を挟んで保持する一対の保持片を有するタイプのブッシングを備えた電動機において、ブッシングに設けられた排水通路から小虫がモータ外郭とブラケットとで覆われた内部へ侵入するのを防止することができる。
According to the electric motor of the present invention, in an electric motor including a bushing of a type having a pair of holding pieces for holding a lead wire, a worm is covered with a motor outer shell and a bracket from a drainage passage provided in the bushing . It is possible to prevent intrusion into the inside.

本発明のブッシングを備えた電動機を示す説明図であり、（ａ）は断面図、（ｂ）は部分斜視図である。It is explanatory drawing which shows the electric motor provided with the bushing of this invention, (a) is sectional drawing, (b) is a partial perspective view. 本発明の電動機のブッシングが配置されるモータ外郭の位置を示す説明図であり、（ａ）は部分正面図、（ｂ）は部分平面図である。It is explanatory drawing which shows the position of the motor outline in which the bushing of the electric motor of this invention is arrange | positioned, (a) is a partial front view, (b) is a partial top view. 本発明の電動機のブッシングを示す外観斜視図である。It is an external appearance perspective view which shows the bushing of the electric motor of this invention. 本発明の電動機の取付態様を説明する説明図であり、（ａ）は部分外観斜視図、（ｂ）は部分平面図である。It is explanatory drawing explaining the attachment aspect of the electric motor of this invention, (a) is a partial external appearance perspective view, (b) is a partial top view. 本発明の電動機のブッシングをモータ外郭に当接させた状態を示す説明図であり、（ａ）は部分断面図、（ｂ）は部分正面図である。It is explanatory drawing which shows the state which made the bushing of the electric motor of this invention contact | abut to the motor outline, (a) is a partial sectional view, (b) is a partial front view.

以下、本発明の実施形態を添付図面に基づき詳細に説明する。図１乃至図５は、本実施形態における電動機を説明する図である。図１乃至図５に示すように、この電動機１は、ステータ２の内部にロータ３を回転可能に配置したインナーロータ型の電動機であり、例えば、空気調和機の室外機に搭載される送風ファンを回転駆動するためのブラシレスＤＣモータである。   Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 5 are diagrams illustrating the electric motor according to the present embodiment. As shown in FIGS. 1 to 5, the electric motor 1 is an inner rotor type electric motor in which a rotor 3 is rotatably arranged inside a stator 2. For example, a blower fan mounted in an outdoor unit of an air conditioner. Is a brushless DC motor for rotationally driving.

この電動機１は、図１に示すように、円筒状のステータ２と、ステータ２の内径側にステータ２と同軸的に配置されるロータ３とを有し、ステータ２は、金型内で合成樹脂をステータコア２１と一体成形することによってステータコア２１のティース面２２を残して、全体が合成樹脂で形成されたモータ外郭４０で覆われている。   As shown in FIG. 1, this electric motor 1 has a cylindrical stator 2 and a rotor 3 arranged coaxially with the stator 2 on the inner diameter side of the stator 2, and the stator 2 is combined in a mold. By integrally molding the resin with the stator core 21, the whole of the stator core 21 is covered with a motor outer shell 40 formed of synthetic resin, except for the teeth surface 22.

ステータ２の一方の端面側（図１において下面）を覆うモータ外郭４０には、ロータ３に備えた後述するシャフト３２を支持する軸受３３が収納される第１ブラケット４１が設けられている。ステータ２の他方の端面側（図１において上面）を覆うモータ外郭４０には、電動機１を駆動する制御部を搭載した回路基板５が搭載され、その回路基板５を覆うようにシャフト３２を支持するもう１つの軸受３４が収納される第２ブラケット４２が設けられている。   A first bracket 41 that accommodates a bearing 33 that supports a shaft 32, which will be described later, provided in the rotor 3 is provided in a motor outer shell 40 that covers one end surface side (lower surface in FIG. 1) of the stator 2. A circuit board 5 having a control unit for driving the electric motor 1 is mounted on a motor outer casing 40 that covers the other end surface side (upper surface in FIG. 1) of the stator 2, and the shaft 32 is supported so as to cover the circuit board 5. A second bracket 42 for accommodating another bearing 34 is provided.

ロータ３は、軸受３３、３４に回転可能な状態で支持されたシャフト３２と、シャフト３２に同軸的に取付けられた円盤状のバックヨーク３５と、バックヨーク３５の外径側に配置された複数の板状のロータマグネット３１とを備えている。ステータ２とロータ３の両端には、第１ブラケット４１はモータ外郭４０と一体成形され、第２ブラケット４２はモータ外郭４０に圧入され、モータ外郭４０の内部を塞ぐことで防水構造になっている。   The rotor 3 includes a shaft 32 rotatably supported by bearings 33 and 34, a disk-shaped back yoke 35 coaxially attached to the shaft 32, and a plurality of rotors arranged on the outer diameter side of the back yoke 35. And a plate-shaped rotor magnet 31. At both ends of the stator 2 and the rotor 3, the first bracket 41 is integrally formed with the motor outer shell 40, the second bracket 42 is press-fitted into the motor outer shell 40, and the inside of the motor outer shell 40 is closed to form a waterproof structure. .

モータ外郭４０と第２ブラケット４２との間には、回路基板５に接続されたリード線５１をモータ外郭４０と第２ブラケット４２とで覆われた内部から外部へ引出すためのブッシング６が設けられている。ブッシング６について説明するにあたり、まず、ブッシング６が当接されるモータ外郭４０の構造について説明する。
A bushing 6 is provided between the motor shell 40 and the second bracket 42 to draw out the lead wire 51 connected to the circuit board 5 from the inside covered with the motor shell 40 and the second bracket 42 to the outside. ing. In describing the bushing 6, first, the structure of the motor outer shell 40 with which the bushing 6 is brought into contact will be described.

モータ外郭４０は、図１、図２、図４に示すように、シャフト３２の出力側（軸受３４の側）に形成されシャフト３２の軸方向に対し垂直な端面４０１と、端面４０１に連続形成されシャフト３２の軸方向に対し平行な外周面４０２が形成されている。モータ外郭４０の端面４０１（図１において上面）の外周側には、端面４０１に連続形成されシャフト３２の軸方向に向かって突出する外周凸部４０７が設けられている。外周凸部４０７には、回路基板５が載置されて、ブッシング６が配置される箇所に切欠部４０３が設けられている。切欠部４０３は、モータ外郭４０の外周から内側に向かって、ブッシング６の幅に対応した開口幅になるように切欠かれている。   As shown in FIGS. 1, 2, and 4, the motor outer shell 40 is formed continuously on the end surface 401, which is formed on the output side (the bearing 34 side) of the shaft 32 and is perpendicular to the axial direction of the shaft 32. An outer peripheral surface 402 that is parallel to the axial direction of the shaft 32 is formed. On the outer peripheral side of the end surface 401 (upper surface in FIG. 1) of the motor outer shell 40, an outer peripheral convex portion 407 continuously formed on the end surface 401 and protruding in the axial direction of the shaft 32 is provided. The circuit board 5 is placed on the outer peripheral protrusion 407, and a notch 403 is provided at a position where the bushing 6 is arranged. The notch portion 403 is notched so as to have an opening width corresponding to the width of the bushing 6 from the outer circumference of the motor outer shell 40 toward the inner side.

切欠部４０３の外周側には、ブッシング６の後述する第２当接部６８が当接される外周面４０２を、モータ外郭４０の最外周から凹んだ箇所に形成するための外周凹部４０４が設けられている。外周凹部４０４は、ブッシング６の第２当接部６８を係止することによってブッシング６を支持する。そして、切欠部４０３の両側に形成された側壁４０５、４０５に、ブッシング６の両側端に形成された切欠部６９、６９を嵌合することによってブッシング６が支持されている。   An outer peripheral recess 404 is formed on the outer peripheral side of the cutout portion 403 for forming an outer peripheral surface 402, which is in contact with a second contact portion 68 of the bushing 6 described later, at a location recessed from the outermost periphery of the motor outer shell 40. Has been. The outer peripheral recess 404 supports the bushing 6 by locking the second contact portion 68 of the bushing 6. The bushings 6 are supported by fitting the notches 69, 69 formed at both ends of the bushing 6 to the side walls 405, 405 formed on both sides of the notch 403.

ブッシング６は、図３および図４に示すように、リード線５１を挟んで保持する一対の第１保持片６１と第２保持片６２とを有し、第１保持片６１と第２保持片６２はそれぞれ、絶縁性を有する合成樹脂から形成されている。第１保持片６１と第２保持片６２にはそれぞれ、互いに向かい合わせて当接する第１向かい合わせ面６３と第２向かい合わせ面６４を有している。第１向かい合わせ面６３と第２向かい合わせ面６４にはそれぞれ、第１向かい合わせ面６３と第２向かい合わせ面６４から凹んでリード線５１が案内される第１案内部６５と第２案内部６６を備えている。   As shown in FIGS. 3 and 4, the bushing 6 has a pair of a first holding piece 61 and a second holding piece 62 that sandwich and hold the lead wire 51, and the first holding piece 61 and the second holding piece 62. Each of 62 is made of an insulating synthetic resin. Each of the first holding piece 61 and the second holding piece 62 has a first facing surface 63 and a second facing surface 64 that face each other and abut. A first guide portion 65 and a second guide portion in which the lead wire 51 is guided by being recessed from the first facing surface 63 and the second facing surface 64, respectively, in the first facing surface 63 and the second facing surface 64. Equipped with 66.

第１保持片６１は、Ｌ字状に形成され、モータ外郭４０の端面４０１に当接される第１当接部６７と、モータ外郭４０の外周面４０２に沿って当接される第２当接部６８を備えている。第１当接部６７と第２当接部６８は、第１保持片６１の幅方向の中央に、第１当接部６７から第２当接部６８にわたって形成され、モータ外郭４０と第２ブラケット４２とで覆われた内部で発生した結露水などの水を排水するための排水通路７を備えている。
The first holding piece 61 is formed in an L shape and has a first contact portion 67 that contacts the end surface 401 of the motor outer casing 40 and a second contact portion that contacts the outer peripheral surface 402 of the motor outer casing 40. The contact portion 68 is provided. The first contact portion 67 and the second contact portion 68 are formed in the widthwise center of the first holding piece 61 from the first contact portion 67 to the second contact portion 68, and the motor outer shell 40 and the second contact portion 68 are formed . A drainage passage 7 for draining water such as dew condensation water generated inside which is covered with the bracket 42 is provided.

排水通路７は、図４および図５に示すように、第１当接部６７の端面４０１との当接面６７１から矩形状に凹んだ第１排水通路７１と、第２当接部６８の外周面４０２との当接面６８１から矩形状に凹んだ第２排水通路７２を備えている。ここで、電動機１を空気調和機の室外機に搭載した場合、電動機１の設置状態として、シャフト３２が水平方向に延び、ブッシング６がモータ外郭４０から鉛直方向の下方に延びているものとする。この時のブッシング６の第１保持片６１に備えた排水通路７は、第１排水通路７１が鉛直方向の下方に、第２排水通路７２が水平方向に延びる通路になっている。   As shown in FIGS. 4 and 5, the drainage passage 7 includes a first drainage passage 71 that is recessed in a rectangular shape from a contact surface 671 that contacts the end surface 401 of the first contact portion 67, and a second contact portion 68. The second drainage passage 72, which is recessed in a rectangular shape from the contact surface 681 with the outer peripheral surface 402, is provided. Here, when the electric motor 1 is mounted on the outdoor unit of the air conditioner, the shaft 32 extends horizontally and the bushing 6 extends downward from the motor outer shell 40 in the vertical direction in the installed state of the electric motor 1. . In the drainage passage 7 provided in the first holding piece 61 of the bushing 6 at this time, the first drainage passage 71 extends vertically downward and the second drainage passage 72 extends horizontally.

このため、排水通路７としては、第１排水通路７１には水を溜める役目を持たせ、第２排水通路７２には溜めた水を排水させる役目を持たせたものになっており、第１排水通路７１の深さＤ１は第２排水通路７２の深さＤ２よりも深く形成されている。第１排水通路７１の深さＤ１は、例えば、１ｍｍに設定されている。さらに、第２排水通路７２の深さＤ２は、アリなどの小虫が入らないように微小な深さに形成されている。第２排水通路７２の深さＤ２は、小虫の大きさと種類が、例えば、ヒメアリ（全長２ｍｍ、頭部（縦幅０．１５ｍｍ、横幅０．５ｍｍ））を基準として、０．１ｍｍに設定されている。図５に示すように、第２排水通路７２の深さＤ２は、ブッシング６の第２当接部６８が当接された状態のとき、第２排水通路７２とモータ外郭４０の外周面４０２との断面の隙間に相当しており、この隙間にヒメアリの頭部（縦幅０．１５ｍｍ）が侵入しないようにしている。   Therefore, as the drainage passage 7, the first drainage passage 71 has a role of storing water, and the second drainage passage 72 has a role of draining the stored water. The depth D1 of the drainage passage 71 is formed deeper than the depth D2 of the second drainage passage 72. The depth D1 of the first drainage passage 71 is set to 1 mm, for example. Further, the depth D2 of the second drainage passage 72 is formed to be a minute depth so that small insects such as ants do not enter. The depth D2 of the second drainage passage 72 is set to 0.1 mm with respect to the size and type of the worm, for example, based on a small ant (total length 2 mm, head (vertical width 0.15 mm, horizontal width 0.5 mm)). Has been done. As shown in FIG. 5, when the second contact portion 68 of the bushing 6 is in contact with the second drain passage 72, the depth D2 of the second drain passage 72 is equal to that of the second drain passage 72 and the outer peripheral surface 402 of the motor outer shell 40. Corresponds to the gap of the cross section, and the head of the primrose (vertical width 0.15 mm) does not enter this gap.

モータ外郭４０の外周凹部４０４と、第１保持片６１の第２当接部６８との間には、第２排水通路７２の出口７２１をモータ外郭４０の外部に繋ぎ、第２排水通路７２から水を排出するためのスリット４０６が形成されている。このスリット４０６の隙間Ｌは、第２排水通路７２の深さＤ２と同様に、アリなどの小虫が入らないように、０．１ｍｍに設定されている。   The outlet 721 of the second drainage passage 72 is connected to the outside of the motor casing 40 between the outer peripheral recess 404 of the motor casing 40 and the second contact portion 68 of the first holding piece 61. A slit 406 for discharging water is formed. The gap L of the slit 406 is set to 0.1 mm so that small insects such as ants do not enter, like the depth D2 of the second drainage passage 72.

以上説明してきた本実施形態による電動機１によれば、第１当接部６７と第２当接部６８は、第１保持片６１の幅方向中央に、第１当接部６７から第２当接部６８にわたって形成され、モータ外郭４０と第２ブラケット４２とで覆われた内部で発生した水を排水するための排水通路７を備え、排水通路７は、第１当接部６７の端面４０１との当接面６７１から矩形状に凹んだ第１排水通路７１と、第２当接部６８の外周面４０２との当接面６８１から矩形状に凹んだ第２排水通路７２とを備え、第１排水通路７１の深さＤ１は第２排水通路７２の深さＤ２よりも深く形成され、第２排水通路７２の深さＤ２は小虫の侵入を阻止するために微小な深さに形成されている。
この結果、リード線５１を挟んで保持する一対の第１保持片６１と第２保持片６２を有するタイプのブッシング６を備えた電動機１において、ブッシング６に設けられた排水通路７から小虫がモータ外郭４０と第２ブラケット４２とで覆われた内部へ侵入するのを防止することができる。 According to the electric motor 1 according to the present embodiment has been described above, the first contact portion 67 second contact portion 68, the center in the width direction of the first holding piece 61, the second person from the first contact portion 67 It is formed over the contact portion 68, provided with a water discharge passage 7 for draining water generated inside covered with a motor shell 40 and the second bracket 42, the drain passage 7, an end face of the first contact portion 67 401 with those from the tangent plane 671 and the first drain passage 71 which is recessed in a rectangular shape, and a second drain passage 72 which is recessed in a rectangular shape from the abutment surface 681 and the outer circumferential surface 402 of the second contact portion 68 with, The depth D1 of the first drainage passage 71 is formed deeper than the depth D2 of the second drainage passage 72, and the depth D2 of the second drainage passage 72 is formed to be a minute depth to prevent entry of small insects. Has been done.
As a result, in the electric motor 1 including the bushing 6 of the type having the pair of the first holding piece 61 and the second holding piece 62 that hold the lead wire 51 in between, worms are discharged from the drainage passage 7 provided in the bushing 6. It is possible to prevent the motor casing 40 and the second bracket 42 from entering the inside.

なお、本実施形態による電動機１では、排水通路７として、矩形状に凹んだ第１排水通路７１と第２排水通路７２を備える構造としたが、本発明はこれに限らず、三角形状や円形状に凹んだ第１排水通路７１と第２排水通路７２を備える構造にしてもよい。この場合、第１排水通路７１の深さＤ１や第２排水通路７２の深さＤ２は、例えば、三角形状や円形状の凹んだ最深の部分において、上述と同様にＤ１＝１ｍｍ、Ｄ２＝０．１ｍｍに設定されている。   In addition, in the electric motor 1 according to the present embodiment, the drainage passage 7 has a structure in which the first drainage passage 71 and the second drainage passage 72, which are recessed in a rectangular shape, are provided, but the present invention is not limited to this, and the shape is triangular or circular. You may make it the structure provided with the 1st drainage passage 71 and the 2nd drainage passage 72 which were recessed in shape. In this case, the depth D1 of the first drainage passage 71 and the depth D2 of the second drainage passage 72 are, for example, D1 = 1 mm and D2 = 0 at the deepest recessed portion of a triangular shape or a circular shape, as described above. It is set to 0.1 mm.

また、本実施形態による電動機１では、モータ外郭４０として、切欠部４０３の外周側には、ブッシング６の第２当接部６８が当接される外周面４０２を、モータ外郭４０の最外周から凹んだ箇所に形成するための外周凹部４０４を設ける構造としたが、本発明はこれに限らず、外周凹部４０４を省略し、モータ外郭４０の最外周にブッシング６の第２当接部６８を当接するようにしてもよい。   Further, in the electric motor 1 according to the present embodiment, as the motor outer shell 40, the outer peripheral surface 402 on which the second contact portion 68 of the bushing 6 abuts is provided on the outer peripheral side of the cutout portion 403 from the outermost periphery of the motor outer shell 40. Although the structure is provided with the outer peripheral recess 404 for forming in the recessed portion, the present invention is not limited to this, and the outer peripheral recess 404 is omitted, and the second contact portion 68 of the bushing 6 is provided on the outermost periphery of the motor outer shell 40. You may make it contact | abut.

１ 電動機
２ ステータ
２１ ステータコア
２２ ティース面
３ ロータ
３１ ロータマグネット
３２ シャフト
３３、３４ 軸受
３５ バックヨーク
４０ モータ外郭
４０１ 端面
４０２ 外周面
４０３ 切欠部
４０４ 外周凹部
４０５ 両側壁
４０６ スリット
４０７ 外周凸部
４１ 第１ブラケット
４２ 第２ブラケット
５ 回路基板
５１ リード線
６ ブッシング
６１ 第１保持片
６２ 第２保持片
６３ 第１向かい合わせ面
６４ 第２向かい合わせ面
６５ 第１案内部
６６ 第２案内部
６７ 第１当接部
６７１ 当接面
６８ 第２当接部
６８１ 当接面
６９ 切欠部
７ 排水通路
７１ 第１排水通路
７２ 第２排水通路
７２１ 出口
Ｄ１ 第１排水通路７１の深さ
Ｄ２ 第２排水通路７２の深さ
Ｌ スリット４０６の隙間 DESCRIPTION OF SYMBOLS 1 Electric motor 2 Stator 21 Stator core 22 Teeth surface 3 Rotor 31 Rotor magnet 32 Shaft 33, 34 Bearing 35 Back yoke 40 Motor outer shell 401 End surface 402 Outer peripheral surface 403 Notch portion 404 Outer peripheral recess 405 Both side walls 406 Slit 407 Outer peripheral convex portion 41 First bracket 42 second bracket 5 circuit board 51 lead wire 6 bushing 61 first holding piece 62 second holding piece 63 first facing surface 64 second facing surface 65 first guide portion 66 second guide portion 67 first contact portion 671 contact surface 68 second contact portion 681 contact surface 69 notch 7 drainage passage 71 first drainage passage 72 second drainage passage 721 outlet D1 depth of first drainage passage 71 D2 depth of second drainage passage 72 Gap of L slit 406

Claims (2)

モータ外郭で覆われたステータと、ロータと、回路基板と、ブラケットとを備えるとともに、前記回路基板に接続されたリード線を、前記モータ外郭と前記ブラケットとで覆われた内部から外部へ引出すためのブッシングを備え、
前記モータ外郭は、前記ブッシングが配置される前記回路基板側に前記ロータの軸方向に対し垂直に形成された端面と、前記端面に連続するように前記ロータの軸方向に対し平行に形成された外周面とを備え、
前記ブッシングは、前記リード線を挟んで保持する一対の保持片を有し、
前記一対の保持片のうちの一方の保持片は、Ｌ字状に形成されるとともに、前記モータ外郭の前記端面に沿って形成されて前記端面に当接する第１当接部と、前記モータ外郭の前記外周面に沿って形成されて前記外周面に当接する第２当接部とを備え、
前記第１当接部と前記第２当接部は、前記一方の保持片の幅方向中央に前記第１当接部から前記第２当接部にわたって形成され、前記モータ外郭と前記ブラケットとで覆われた内部で発生した水を排水するための排水通路を備え、
前記排水通路は、前記第１当接部の前記端面との当接面から凹んだ第１排水通路と、前記第２当接部の前記外周面との当接面から凹んだ第２排水通路とを備え、
前記第１排水通路の深さは前記第２排水通路の深さよりも深く形成され、
前記第２排水通路の深さは小虫の侵入を阻止するために微小な深さに形成されていることを特徴とする電動機。 A stator, a rotor, a circuit board, and a bracket, which are covered with the motor outer shell, are provided, and lead wires connected to the circuit board are drawn out from the inside covered with the motor outer shell and the bracket to the outside. Equipped with a bushing
The motor outer shell is formed parallel to the axial direction of the rotor so as to be continuous with the end surface formed perpendicular to the axial direction of the rotor on the circuit board side where the bushing is arranged. With an outer peripheral surface,
The bushing has a pair of holding pieces that hold the lead wire therebetween.
One holding piece of the pair of holding pieces is formed in an L shape, and has a first contact portion formed along the end surface of the motor outer shell and contacting the end surface, and the motor outer shell. A second contact portion that is formed along the outer peripheral surface and contacts the outer peripheral surface,
The first abutment portion and the second abutment portion are formed in the widthwise center of the one holding piece from the first abutment portion to the second abutment portion, and include the motor outer shell and the bracket. Equipped with a drainage passage for draining the water generated inside the covered,
The drainage passage has a first drainage passage recessed from a contact surface of the first contact portion with the end surface, and a second drainage passage recessed from a contact surface of the second contact portion with the outer peripheral surface. With and
The depth of the first drainage passage is formed deeper than the depth of the second drainage passage,
The electric motor, wherein the second drainage passage is formed to have a minute depth so as to prevent invasion of small insects. 前記モータ外郭は、前記外周面を前記モータ外郭の最外周から凹んだ箇所に形成するための外周凹部を備え、
前記外周凹部と前記第２当接部の間には、前記第２排水通路の出口を前記モータ外郭の外部に繋ぐ前記第２排水通路の深さと同じ微小な隙間が形成されていることを特徴とする請求項１に記載の電動機。
The motor outer shell is provided with an outer peripheral recess for forming the outer peripheral surface at a location recessed from the outermost periphery of the motor outer shell,
A minute gap having the same depth as the depth of the second drain passage connecting the outlet of the second drain passage to the outside of the motor shell is formed between the outer peripheral recess and the second contact portion. The electric motor according to claim 1.
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