JP2020182347A - Electric motor - Google Patents

Electric motor Download PDF

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JP2020182347A
JP2020182347A JP2019085092A JP2019085092A JP2020182347A JP 2020182347 A JP2020182347 A JP 2020182347A JP 2019085092 A JP2019085092 A JP 2019085092A JP 2019085092 A JP2019085092 A JP 2019085092A JP 2020182347 A JP2020182347 A JP 2020182347A
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shaft
bracket
electric motor
fan
load side
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JP7134132B2 (en
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量平 山川
Ryohei Yamakawa
量平 山川
仁明 大熊
Masaaki Okuma
仁明 大熊
大輝 守屋
daiki Moriya
大輝 守屋
原　徹
Toru Hara
原　　徹
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

To obtain an electric motor equipped with an external fan for preventing foreign matters from accumulating around a shaft penetration portion.SOLUTION: An electric motor includes a tubular frame 30 to which a stator 10 is fixed, a rotor 20 to which a shaft 22 is fixed, and which is disposed in a tube of the stator 10 with a gap between the rotor and the stator 10, brackets 31A, 31B closing load side and counter-load side ends of the frame 30, and formed with a shaft penetrating portion 50 through which the shaft 22 penetrates, and an external fan 40 attached to the shaft 22 protruding from the shaft penetrating portion 50 of the bracket 31B on the counter-load side. The external fan 40 has blades 42 for generating airflow in a radial direction of the shaft 22 and in a direction away from the shaft 22 along with a rotation of the shaft 22 on a surface facing the bracket 31B on the counter-load side.SELECTED DRAWING: Figure 1

Description

本発明は、冷却用の外扇ファンを備えた電動機に関する。 The present invention relates to an electric motor provided with an external fan for cooling.

電動機は、筒状のフレーム及びフレームの両端部を塞ぐブラケットで構成されるケースの内部に回転可能に設けられた回転子を回転させる。回転子にはシャフトが連結されている。電動機には、ブラケットを通じてケースの外部にシャフトを突出させて、シャフトの突出部に外扇ファンを設けたものがある。シャフトとともに外扇ファンが回転することで、ケース内の回転子及び固定子を冷却する。 The electric motor rotates a rotor rotatably provided inside a case composed of a tubular frame and brackets that close both ends of the frame. A shaft is connected to the rotor. Some electric motors have a shaft projected to the outside of the case through a bracket, and an external fan fan is provided at the protruding portion of the shaft. The external fan fan rotates together with the shaft to cool the rotor and stator inside the case.

ブラケットからシャフトを突出させたシャフト突出部に冷却用の外扇ファンが設置された電動機は、ブラケットの軸貫通部から電動機内部に異物が侵入することを防止する必要がある。 In an electric motor in which a cooling external fan fan is installed in the shaft protruding portion where the shaft protrudes from the bracket, it is necessary to prevent foreign matter from entering the inside of the motor through the shaft penetrating portion of the bracket.

特許文献１には、軸貫通部にラビリンス構造を設けて保護する電動機が開示されている。 Patent Document 1 discloses an electric motor that protects the shaft penetrating portion by providing a labyrinth structure.

実開平１−９３９４５号公報Jikkenhei No. 1-93945

しかしながら、特許文献１に開示される電動機は、軸貫通部の周辺に異物が堆積してしまうと、ラビリンス構造を抜けて軸貫通部から電動機内部へ異物が侵入したり、軸貫通部への異物の固着が発生したりする。したがって、電動機内部への異物の侵入及び軸貫通部への異物の固着を防ぐために、定期的にメンテナンスを行って軸貫通部の周辺に堆積した異物を除去する必要があった。 However, in the electric motor disclosed in Patent Document 1, if foreign matter is accumulated around the shaft penetrating portion, the foreign matter may pass through the labyrinth structure and enter the motor from the shaft penetrating portion, or the foreign matter may enter the shaft penetrating portion. Sticking occurs. Therefore, in order to prevent foreign matter from entering the motor and sticking to the shaft penetrating portion, it is necessary to perform regular maintenance to remove the foreign matter accumulated around the shaft penetrating portion.

本発明は、上記に鑑みてなされたものであって、外扇ファンを備え軸貫通部の周辺に異物が堆積しにくい電動機を得ることを目的とする。 The present invention has been made in view of the above, and an object of the present invention is to obtain an electric motor provided with an external fan fan and in which foreign matter is unlikely to accumulate around the shaft penetrating portion.

上述した課題を解決し、目的を達成するために、本発明は、固定子が固定される筒状のフレームと、シャフトが固定され、固定子との間に隙間を空けて固定子の筒内に配置される回転子と、フレームの負荷側及び反負荷側の端部を塞ぎ、シャフトが貫通する軸貫通部が形成されたブラケットと、反負荷側のブラケットの軸貫通部から突出したシャフトに取り付けられた外扇ファンとを備える。外扇ファンは、反負荷側のブラケットと対向する面に、シャフトの回転にともなって、シャフトの径方向かつシャフトから離れる方向の気流を発生させる羽根を有する。 In order to solve the above-mentioned problems and achieve the object, the present invention has a tubular frame to which the stator is fixed and a shaft is fixed, and a gap is provided between the stator and the inside of the stator. On the rotor arranged in, the bracket that closes the load side and anti-load side ends of the frame and has a shaft penetration part through which the shaft penetrates, and the shaft that protrudes from the shaft penetration part of the bracket on the anti-load side. Equipped with an attached external fan fan. The external fan fan has blades on the surface facing the bracket on the opposite load side to generate an air flow in the radial direction of the shaft and in the direction away from the shaft as the shaft rotates.

本発明によれば、外扇ファンを備え軸貫通部の周辺に異物が堆積しにくい電動機を得られるという効果を奏する。 According to the present invention, it is possible to obtain an electric motor provided with an external fan fan in which foreign matter is unlikely to accumulate around the shaft penetrating portion.

本発明の実施の形態１に係る電動機の縦断面を示す図The figure which shows the vertical section of the electric motor which concerns on Embodiment 1 of this invention. 本発明の実施の形態２に係る電動機の縦断面を示す図The figure which shows the vertical section of the electric motor which concerns on Embodiment 2 of this invention. 実施の形態２に係る電動機の正面図Front view of the electric motor according to the second embodiment 本発明の実施の形態３に係る電動機の縦断面を示す図The figure which shows the vertical section of the electric motor which concerns on Embodiment 3 of this invention. 実施の形態３に係る電動機の変形例を示す図The figure which shows the modification of the electric motor which concerns on Embodiment 3. 本発明の実施の形態４に係る電動機の縦断面を示す図The figure which shows the vertical section of the electric motor which concerns on Embodiment 4 of this invention. 本発明の実施の形態５に係る電動機の縦断面を示す図The figure which shows the vertical section of the electric motor which concerns on Embodiment 5 of this invention.

以下に、本発明の実施の形態に係る電動機を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。 Hereinafter, the electric motor according to the embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.

実施の形態１．
図１は、本発明の実施の形態１に係る電動機の縦断面を示す図である。実施の形態１に係る電動機１は、シャフト２２が結合された回転子２０と、フレーム３０に固定された固定子１０とを備える。なお、電動機１は、シャフト２２の中心軸２２ｃに軸対称な構造であるため、中心軸２２ｃの一方の側のみ図示している。これは他の実施の形態においても同様である。 Embodiment 1.
FIG. 1 is a diagram showing a vertical cross section of an electric motor according to a first embodiment of the present invention. The electric motor 1 according to the first embodiment includes a rotor 20 to which a shaft 22 is connected and a stator 10 fixed to a frame 30. Since the electric motor 1 has a structure symmetrical with respect to the central shaft 22c of the shaft 22, only one side of the central shaft 22c is shown in the figure. This also applies to other embodiments.

筒状のフレーム及びフレームの両端部を塞ぐブラケットによって構成されるケースに、回転子２０の回転機構を有しつつ回転子２０を保持するために、シャフト２２の負荷側及び反負荷側の２箇所に軸受２４ａ，２４ｂの内輪面を嵌合し、負荷側のブラケット３１ａに軸受２４ａの外輪面を固定し、反負荷側のブラケット３１ｂに軸受２４ｂの外輪面を固定している。ブラケット３１ｂの軸貫通部５０からはシャフト２２が突出しており、シャフト突出部２５に外扇ファン４０が設置されている。ブラケット３１ｂには、シャフト２２の軸方向に貫通する複数の穴が設けられている。 In order to hold the rotor 20 while having the rotation mechanism of the rotor 20 in a case composed of a tubular frame and brackets that close both ends of the frame, there are two locations on the load side and the counterload side of the shaft 22. The inner ring surface of the bearings 24a and 24b is fitted into the bracket 31a, the outer ring surface of the bearing 24a is fixed to the bracket 31a on the load side, and the outer ring surface of the bearing 24b is fixed to the bracket 31b on the opposite load side. A shaft 22 projects from the shaft penetrating portion 50 of the bracket 31b, and an external fan fan 40 is installed on the shaft protruding portion 25. The bracket 31b is provided with a plurality of holes penetrating in the axial direction of the shaft 22.

外扇ファン４０は、フレーム３０側に羽根４２を有する。羽根４２は、シャフト２２に垂直な断面において羽根４２の中心線４２ｃがシャフト２２の中心軸２２ｃを通る形状であり、放射状に配置されている。シャフト２２が回転することで外扇ファン４０も回転し、外扇ファン４０がシャフト２２の径方向かつシャフト２２から離れる方向へ気流を発生させ外扇ファン４０とブラケット３１ｂとの間に入る異物を吹き飛ばす。また、シャフト２２とともに外扇ファン４０が回転することで、ブラケット３１ｂを貫通する複数の穴を通じてフレーム３０内部の空気が吸い出され、フレーム３０内に気流が発生し、回転子２０及び固定子１０が冷却される。 The outer fan fan 40 has blades 42 on the frame 30 side. The blades 42 have a shape in which the center line 42c of the blades 42 passes through the central shaft 22c of the shaft 22 in a cross section perpendicular to the shaft 22, and are arranged radially. As the shaft 22 rotates, the outer fan fan 40 also rotates, and the outer fan fan 40 generates an air flow in the radial direction of the shaft 22 and in the direction away from the shaft 22 to prevent foreign matter entering between the outer fan fan 40 and the bracket 31b. blow off. Further, when the outer fan 40 rotates together with the shaft 22, the air inside the frame 30 is sucked out through a plurality of holes penetrating the bracket 31b, an air flow is generated in the frame 30, and the rotor 20 and the stator 10 are generated. Is cooled.

実施の形態１に係る電動機１は、反負荷側のブラケット３１ｂと外扇ファン４０との間にシャフト２２の径方向かつシャフト２２から離れる方向の気流を発生させるため、軸貫通部５０の周辺に異物が堆積することを防止できる。したがって、軸貫通部５０の周辺に堆積した異物が軸貫通部５０を通り抜けて電動機１の内部に侵入することは防止される。 The electric motor 1 according to the first embodiment generates an air flow in the radial direction of the shaft 22 and in the direction away from the shaft 22 between the bracket 31b on the counterload side and the external fan fan 40, so that the electric motor 1 is located around the shaft penetrating portion 50. It is possible to prevent foreign matter from accumulating. Therefore, foreign matter accumulated around the shaft penetrating portion 50 is prevented from passing through the shaft penetrating portion 50 and entering the inside of the electric motor 1.

実施の形態２．
図２は、本発明の実施の形態２に係る電動機の縦断面を示す図である。図３は、実施の形態２に係る電動機の正面図である。外扇ファン４０は、シャフト２２が締結されるハブ４１に貫通穴４３が形成されている。貫通穴４３は、ハブ４１のうち反負荷側のブラケット３１ｂと対向する面４１ａと、反負荷側のブラケット３１ｂと対向する面４１ａの裏側の面４１ｂとを繋いでいる。実施の形態２に係る電動機１は、貫通穴４３を通って外扇ファン４０と反負荷側のブラケット３１ｂとの間の空間へ空気が流入できるため、シャフト２２の径方向かつシャフト２２から離れる方向へ気流を効率良く発生させて、外扇ファン４０と反負荷側のブラケット３１ｂとの間に入る異物を吹き飛ばすことができる。また、電動機１の停止時に軸貫通部５０の周辺に異物が堆積したとしても、外扇ファン４０が発生させる気流により異物を巻上げ、シャフト２２の径方向かつシャフト２２から離れる方向へ吹き飛ばすことができる。 Embodiment 2.
FIG. 2 is a diagram showing a vertical cross section of the electric motor according to the second embodiment of the present invention. FIG. 3 is a front view of the electric motor according to the second embodiment. The outer fan fan 40 has a through hole 43 formed in the hub 41 to which the shaft 22 is fastened. The through hole 43 connects the surface 41a of the hub 41 facing the bracket 31b on the counterload side and the surface 41b on the back side of the surface 41a facing the bracket 31b on the counterload side. In the electric motor 1 according to the second embodiment, air can flow into the space between the outer fan fan 40 and the bracket 31b on the counterload side through the through hole 43, so that the direction is the radial direction of the shaft 22 and the direction away from the shaft 22. It is possible to efficiently generate an air flow to blow off foreign matter that enters between the outer fan fan 40 and the bracket 31b on the opposite load side. Further, even if foreign matter accumulates around the shaft penetrating portion 50 when the electric motor 1 is stopped, the foreign matter can be wound up by the air flow generated by the external fan fan 40 and blown off in the radial direction of the shaft 22 and in the direction away from the shaft 22. ..

実施の形態３．
図４は、本発明の実施の形態３に係る電動機の縦断面を示す図である。貫通穴４３は、反負荷側のブラケット３１ｂと対向する第１の端部である端部４３ａにおける開口の中心４４ａが、端部４３ａと反対側の第２の端部である端部４３ｂにおける開口の中心４４ｂよりも外周側に位置している。反負荷側のブラケット３１ｂのうち外扇ファン４０の貫通穴４３と対向する部分には、貫通穴４３の内周側の壁面に滑らかに繋がる形状の凸部３１ｃが設けられている。凸部３１ｃは、外扇ファン４０のハブ４１の内側に入り込んでいる。このように、反負荷側のブラケット３１ｂには、外扇ファン４０側ほどシャフト２２の中心軸２２ｃに近づく勾配を備えた凸部３１ｃが、端部４３ａにおける貫通穴４３の開口の中心４４ａよりもシャフト２２の径方向の外周側に設けられている。 Embodiment 3.
FIG. 4 is a diagram showing a vertical cross section of the electric motor according to the third embodiment of the present invention. In the through hole 43, the center 44a of the opening at the end 43a, which is the first end facing the bracket 31b on the counterload side, is the opening at the end 43b, which is the second end opposite to the end 43a. It is located on the outer peripheral side of the center 44b. A convex portion 31c having a shape that smoothly connects to the inner peripheral wall surface of the through hole 43 is provided in a portion of the bracket 31b on the counterload side that faces the through hole 43 of the outer fan fan 40. The convex portion 31c is inserted inside the hub 41 of the outer fan fan 40. As described above, the bracket 31b on the counterload side has a convex portion 31c having a gradient closer to the central axis 22c of the shaft 22 toward the outer fan fan 40 side than the center 44a of the opening of the through hole 43 at the end portion 43a. It is provided on the outer peripheral side of the shaft 22 in the radial direction.

実施の形態３に係る電動機１は、貫通穴４３を通り抜けて外扇ファン４０と反負荷側のブラケット３１ｂとの間に流入した空気が反負荷側のブラケット３１ｂの凸部３１ｃに沿って外径方向に案内される。したがって、実施の形態３に係る電動機１は、風路抵抗を減らすことができ、シャフト２２の径方向かつシャフト２２から離れる方向への気流を効率良く発生させて、外扇ファン４０と反負荷側のブラケット３１ｂとの間に入る異物を吹き飛ばすことができる。また、電動機１の停止時に軸貫通部５０の周辺に異物が堆積したとしても、外扇ファン４０が発生させる気流により異物を巻上げ、外扇ファン４０の径方向かつシャフト２２から離れる方向へ吹き飛ばすことができる。 In the electric motor 1 according to the third embodiment, the air that has passed through the through hole 43 and has flowed in between the outer fan fan 40 and the bracket 31b on the counterload side has an outer diameter along the convex portion 31c of the bracket 31b on the counterload side. You will be guided in the direction. Therefore, the electric motor 1 according to the third embodiment can reduce the air passage resistance, efficiently generate an air flow in the radial direction of the shaft 22 and in the direction away from the shaft 22, and is on the side opposite to the external fan fan 40. Foreign matter that enters between the bracket 31b and the bracket 31b can be blown off. Further, even if foreign matter accumulates around the shaft penetrating portion 50 when the electric motor 1 is stopped, the foreign matter is wound up by the air flow generated by the outer fan fan 40 and blown off in the radial direction of the outer fan fan 40 and in the direction away from the shaft 22. Can be done.

図５は、実施の形態３に係る電動機の変形例を示す図である。貫通穴４３は、シャフト２２の軸方向に対して傾斜している。実施の形態３の変形例に係る電動機１は、貫通穴４３を通過する気流と、外扇ファン４０と反負荷側のブラケット３１ｂとの間で外径方向に流れる気流とで向きの変化が小さくなるため、風路抵抗をより減らすことができる。 FIG. 5 is a diagram showing a modified example of the electric motor according to the third embodiment. The through hole 43 is inclined with respect to the axial direction of the shaft 22. The electric motor 1 according to the modified example of the third embodiment has a small change in direction between the airflow passing through the through hole 43 and the airflow flowing in the outer diameter direction between the outer fan fan 40 and the bracket 31b on the opposite load side. Therefore, the airflow resistance can be further reduced.

実施の形態３に係る電動機１は、反負荷側のブラケット３１ｂに凸部３１ｃが形成されているため、外扇ファン４０と反負荷側のブラケット３１ｂとの間に侵入した異物は、凸部３１ｃによって貫通穴４３に導かれ、電動機１の外部に排出されやすくなる。したがって、軸貫通部５０の周辺に異物が堆積しにくくなる。 In the electric motor 1 according to the third embodiment, since the convex portion 31c is formed on the bracket 31b on the counterload side, foreign matter that has entered between the outer fan fan 40 and the bracket 31b on the counterload side is the convex portion 31c. It is guided to the through hole 43 and easily discharged to the outside of the electric motor 1. Therefore, foreign matter is less likely to accumulate around the shaft penetrating portion 50.

実施の形態４．
図６は、本発明の実施の形態４に係る電動機の縦断面を示す図である。実施の形態４に係る電動機１は、反負荷側のブラケット３１ｂのうち外扇ファン４０の貫通穴４３と対向する部分には、貫通穴４３の内周側の壁面に滑らかに繋がる形状の凸部３１ｃが設けられている。凸部３１ｃは、外扇ファン４０のハブ４１の内側に入り込んではいない。外扇ファン４０のハブ４１には、反負荷側のブラケット３１ｂに向かって突出する凸部４１ｃが設けられている。反負荷側のブラケット３１ｂには、凸部４１ｃと対向する部分に凹部３１ｄが設けられている。したがって、凸部４１ｃと凹部３１ｄとは、ラビリンス構造をなしている。このように、外扇ファン４０と反負荷側のブラケット３１ｂとの間には、貫通穴４３の端部４３ａよりもシャフト２２の径方向の内周側にラビリンス構造が形成されている。 Embodiment 4.
FIG. 6 is a diagram showing a vertical cross section of the electric motor according to the fourth embodiment of the present invention. The electric motor 1 according to the fourth embodiment has a convex portion having a shape that smoothly connects to the inner peripheral side wall surface of the through hole 43 at a portion of the bracket 31b on the counterload side facing the through hole 43 of the outer fan fan 40. 31c is provided. The convex portion 31c does not enter the inside of the hub 41 of the outer fan fan 40. The hub 41 of the outer fan fan 40 is provided with a convex portion 41c that protrudes toward the bracket 31b on the opposite load side. The bracket 31b on the counterload side is provided with a concave portion 31d at a portion facing the convex portion 41c. Therefore, the convex portion 41c and the concave portion 31d have a labyrinth structure. As described above, a labyrinth structure is formed between the outer fan fan 40 and the bracket 31b on the counterload side on the inner peripheral side of the shaft 22 in the radial direction with respect to the end portion 43a of the through hole 43.

実施の形態４に係る電動機１は、反負荷側のブラケット３１ｂに凸部３１ｃを設けているため、実施の形態３に係る電動機１と同様に、風路抵抗を減らすことができ、外扇ファン４０の径方向かつシャフト２２から離れる方向への気流を効率良く発生させて、外扇ファン４０と反負荷側のブラケット３１ｂとの間に入る異物を吹き飛ばすことができる。また、電動機１の停止時に軸貫通部５０の周辺に異物が堆積したとしても、外扇ファン４０が発生させる気流により異物を巻上げ、外扇ファン４０の径方向かつシャフト２２から離れる方向へ吹き飛ばすことができる。外扇ファン４０と反負荷側のブラケット３１ｂとの間に侵入した異物は、凸部３１ｃによって貫通穴４３に導かれ、電動機１の外部に排出されやすくなる。 Since the electric motor 1 according to the fourth embodiment is provided with the convex portion 31c on the bracket 31b on the counterload side, the air passage resistance can be reduced as in the electric motor 1 according to the third embodiment, and the external fan fan. It is possible to efficiently generate an air flow in the radial direction of the 40 and in the direction away from the shaft 22 to blow off foreign matter entering between the outer fan fan 40 and the bracket 31b on the counterload side. Further, even if foreign matter accumulates around the shaft penetrating portion 50 when the electric motor 1 is stopped, the foreign matter is wound up by the air flow generated by the outer fan fan 40 and blown off in the radial direction of the outer fan fan 40 and in the direction away from the shaft 22. Can be done. Foreign matter that has entered between the external fan fan 40 and the bracket 31b on the opposite load side is guided to the through hole 43 by the convex portion 31c, and is easily discharged to the outside of the motor 1.

さらに、外扇ファン４０のハブ４１の凸部４１ｃと、反負荷側のブラケット３１ｂの凹部３１ｄとの間にラビリンス構造が形成されるため、軸貫通部５０の周辺に異物が堆積しにくい。 Further, since the labyrinth structure is formed between the convex portion 41c of the hub 41 of the outer fan fan 40 and the concave portion 31d of the bracket 31b on the counterload side, foreign matter is unlikely to accumulate around the shaft penetrating portion 50.

実施の形態５．
図７は、本発明の実施の形態５に係る電動機の縦断面を示す図である。外扇ファン４０は、反負荷側のブラケット３１ｂと対向する面の裏側の面に羽根４４を有している。羽根４４の形状及び配置は、羽根４２と同様である。この他は実施の形態３と同様である。 Embodiment 5.
FIG. 7 is a diagram showing a vertical cross section of the electric motor according to the fifth embodiment of the present invention. The outer fan fan 40 has blades 44 on the surface on the back side of the surface facing the bracket 31b on the opposite load side. The shape and arrangement of the blades 44 are the same as those of the blades 42. Others are the same as in the third embodiment.

実施の形態５に係る電動機１は、フレーム３０内の固定子１０及び回転子２０を冷却する気流を強くし、冷却性能を高めることができる。 The electric motor 1 according to the fifth embodiment can enhance the cooling performance by increasing the air flow for cooling the stator 10 and the rotor 20 in the frame 30.

以上の実施の形態に示した構成は、本発明の内容の一例を示すものであり、別の公知の技術と組み合わせることも可能であるし、本発明の要旨を逸脱しない範囲で、構成の一部を省略、変更することも可能である。 The configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

１ 電動機、１０ 固定子、２０ 回転子、２２ シャフト、２２ｃ 中心軸、２４ａ，２４ｂ 軸受、２５ シャフト突出部、３０ フレーム、３１ａ，３１ｂ ブラケット、３１ｃ，４１ｃ 凸部、３１ｄ 凹部、４０ 外扇ファン、４１ ハブ、４１ａ，４１ｂ 面、４２，４４ 羽根、４２ｃ 中心線、４３ 貫通穴、４３ａ，４３ｂ 端部、４４ａ，４４ｂ 開口の中心、５０ 軸貫通部。 1 motor, 10 stator, 20 rotor, 22 shaft, 22c central shaft, 24a, 24b bearing, 25 shaft protrusion, 30 frame, 31a, 31b bracket, 31c, 41c convex part, 31d concave part, 40 external fan fan, 41 hub, 41a, 41b plane, 42,44 blade, 42c center line, 43 through hole, 43a, 43b end, 44a, 44b center of opening, 50 axis penetration.

Claims (6)

固定子が固定される筒状のフレームと、
シャフトが固定され、前記固定子との間に隙間を空けて前記固定子の筒内に配置される回転子と、
前記フレームの負荷側及び反負荷側の端部を塞ぎ、前記シャフトが貫通する軸貫通部が形成されたブラケットと、
反負荷側の前記ブラケットの前記軸貫通部から突出した前記シャフトに取り付けられた外扇ファンとを備え、
前記外扇ファンは、反負荷側の前記ブラケットと対向する面に、前記シャフトの回転にともなって、前記シャフトの径方向かつ前記シャフトから離れる方向の気流を発生させる羽根を有することを特徴とする電動機。 A tubular frame to which the stator is fixed and
A rotor to which the shaft is fixed and arranged in the cylinder of the stator with a gap between the shaft and the stator.
A bracket that closes the load side and non-load side ends of the frame and has a shaft penetration portion through which the shaft penetrates.
It is provided with an external fan fan attached to the shaft protruding from the shaft penetration portion of the bracket on the counterload side.
The outer fan fan is characterized by having blades on a surface facing the bracket on the opposite load side to generate an air flow in the radial direction of the shaft and in the direction away from the shaft as the shaft rotates. Electric motor. 前記外扇ファンは、前記シャフトが締結されるハブを備え、
前記ハブは、反負荷側の前記ブラケットと対向する面と、反負荷側の前記ブラケットと対向する面の裏面とを繋ぐ貫通穴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 external fan fan comprises a hub to which the shaft is fastened.
The electric motor according to claim 1, wherein the hub is formed with a through hole connecting a surface facing the bracket on the counterload side and a back surface of the surface facing the bracket on the counterload side. .. 前記貫通穴は、反負荷側の前記ブラケットと対向する第１の端部における開口の中心が、前記第１の端部とは反対側の第２の端部における開口の中心よりも外周側に位置していることを特徴とする請求項２に記載の電動機。 In the through hole, the center of the opening at the first end facing the bracket on the counterload side is on the outer peripheral side of the center of the opening at the second end opposite to the first end. The electric motor according to claim 2, wherein the electric motor is located. 反負荷側の前記ブラケットは、前記外扇ファン側ほど前記シャフトの中心軸に近づく勾配を備えた凸部が、前記貫通穴の前記第１の端部よりも前記シャフトの径方向の外周側に設けられていることを特徴とする請求項３に記載の電動機。 In the bracket on the counterload side, a convex portion having a gradient closer to the central axis of the shaft toward the outer fan fan side is closer to the outer peripheral side in the radial direction of the shaft than the first end portion of the through hole. The electric motor according to claim 3, wherein the electric motor is provided. 前記外扇ファンと反負荷側の前記ブラケットとの間には、前記貫通穴の前記第１の端部よりも前記シャフトの径方向の内周側にラビリンス構造が形成されていることを特徴とする請求項３又は４に記載の電動機。 A labyrinth structure is formed between the outer fan fan and the bracket on the opposite load side on the inner peripheral side in the radial direction of the shaft from the first end of the through hole. The electric motor according to claim 3 or 4. 前記外扇ファンは、反負荷側の前記ブラケットと対向する面の裏側の面に羽根を有することを特徴とする請求項１から５のいずれか１項に記載の電動機。 The electric motor according to any one of claims 1 to 5, wherein the outer fan fan has blades on a surface on the back side of a surface facing the bracket on the opposite load side.
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4729404U (en) * 1971-04-27 1972-12-04
JPS48403U (en) * 1971-06-01 1973-01-06
JPS55150664U (en) * 1979-04-16 1980-10-30
JPS5686849U (en) * 1979-12-03 1981-07-11
JPS6073350U (en) * 1983-10-24 1985-05-23 株式会社明電舎 Open rotating electric machine
DE3933067A1 (en) * 1988-10-11 1990-04-19 Schorch Gmbh Air-cooled electric motor
US20080042502A1 (en) * 2006-08-15 2008-02-21 Bombardier Transportation Gmbh Semi-enclosed AC motor
CN201478944U (en) * 2009-09-09 2010-05-19 董国庆 Automobile generator with double air passages and double fans

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4729404U (en) * 1971-04-27 1972-12-04
JPS48403U (en) * 1971-06-01 1973-01-06
JPS55150664U (en) * 1979-04-16 1980-10-30
JPS5686849U (en) * 1979-12-03 1981-07-11
JPS6073350U (en) * 1983-10-24 1985-05-23 株式会社明電舎 Open rotating electric machine
DE3933067A1 (en) * 1988-10-11 1990-04-19 Schorch Gmbh Air-cooled electric motor
US20080042502A1 (en) * 2006-08-15 2008-02-21 Bombardier Transportation Gmbh Semi-enclosed AC motor
CN201478944U (en) * 2009-09-09 2010-05-19 董国庆 Automobile generator with double air passages and double fans

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