JP2004274907A

JP2004274907A - Magnet generator with cover

Info

Publication number: JP2004274907A
Application number: JP2003063406A
Authority: JP
Inventors: Kazunori Umehara; 和紀梅原; Shinji Komatsu; 真二小松; Tokiaki Endo; 常昭遠藤
Original assignee: Kokusan Denki Co Ltd
Current assignee: Mahle Electric Drive Systems Co Ltd
Priority date: 2003-03-10
Filing date: 2003-03-10
Publication date: 2004-09-30

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a magnet generator with cover wherein hot air is prevented from circulating in the cover. <P>SOLUTION: The magnet generator 1 is formed of a magnet rotor 4 and an armature 5 disposed inside the rotor. At least some of a plurality of air vents 2d in the bottom wall portion 2b of a rotor yoke 2 are provided with cooling air inlet portions 10. The cooling air inlet portions 10 are so formed that at least some of the air vents 2d is covered therewith from outside the rotor yoke 2, and opened on the front side in the direction of rotation of the rotor yoke 2. The rotor yoke 2 is provided with a cover 13 which covers the rotor yoke with a gap 12 in-between. Air intake ports 15 are formed in the bottom wall portion 13b of the cover 13, and exhaust ports 16 are formed in the peripheral wall portion 13a of the cover 13. The rotor yoke 2 is provided with fans 18 which blow the air between the peripheral wall portion 2a of the rotor yoke 2 and the peripheral wall portion 13a of the cover 13 to the exhaust port 16 side of the cover 13 along the circumference of the peripheral wall portion 2a of the rotor yoke 2. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、磁石発電機の回転子ヨークの周壁部と底壁部に対して空隙を隔てて覆うカバーが設けられているカバー付き磁石発電機に関するものである。
【０００２】
【従来の技術】
従来の磁石発電機１は、図１０（Ａ）（Ｂ）に示すように、周壁部２ａと底壁部２ｂとを有するほぼカップ状の形状を有する回転子ヨーク２と、回転子ヨーク２の周壁部２ａの内周に取り付けられた永久磁石３とを備えた磁石回転子４と、該磁石回転子４の内側に配置された電機子５とを備えている。
【０００３】
回転子ヨーク２は、その底壁部２ｂの中央にボス部２ｃを有していて、このボス部が図示しない原動機（多くの場合内燃機関）の回転軸に取り付けられる。
【０００４】
また電機子５は、電機子鉄心６と、該電機子鉄心に巻装された電機子コイル７とからなっていて、原動機のケース等に固定され、電機子鉄心６の外周部に設けられた磁極部が磁石回転子４の永久磁石３に所定のギャップを介して対向させられる。
【０００５】
この種の磁石発電機１においては、電機子コイル７に負荷電流が流れたときに生じる損失により該電機子コイル７が発熱するため、該発電機から大きな出力を取り出すためには、電機子コイル７を効率よく冷却することができるようにしておく必要がある。
【０００６】
そこで、特許文献１において、図示のように、回転子ヨーク２の底壁部２ｂを貫通させて、底壁部２ｂの外周部に沿って並ぶ複数の通気孔２ｄ，２ｄ，…を形成するとともに、回転子ヨーク２の底壁部２ｂの外面にネジ８により固定した環状の板９に、各通気孔２ｄに対応する冷却風導入部１０を設け、各冷却風導入部１０の内側の冷却風導入通路１１を通して各通気孔２ｄに冷却風を導入するようにし、またこれら６個の通気孔２ａの間に、通気孔２ｄよりも小径の３個の補助通気孔２ｄ´が１２０度間隔で設けられた冷却構造が提案された。
【０００７】
該冷却風導入部１０は、底壁部２ｂと反対側に膨出した状態で対応する通気孔２ｄの少なくとも一部を覆うように形成され、冷却風導入部１０の内側に形成された冷却風導入通路１１は、回転子ヨーク２の回転方向（図１０の矢印Ａ方向）の前方側に開口するように設けられている。
【０００８】
このような磁石発電機は、回転子ヨーク２が矢印Ａ方向に回転するので、図１１に示すように回転子ヨーク２の周壁部２ａと底壁部２ｂに対して空隙１２を隔てて覆う周壁部１３ａと底壁部１３ｂとを有するカバー１３が設けられ、該カバー１３は原動機のケースのからなる支持体１４に図示しないがネジ等で固定されて、カバー付き磁石発電機となっている。カバー１３の底壁部１３ｂには空気取入れ口１５が開口され、該カバー１３の周壁部１３ａには排気口１６が開口されている。回転子ヨーク２のボス部２ｃは原動機の回転軸１７に嵌められ、ナット１７ａの締結により回転軸１７と一緒に回転するようになっている。
【０００９】
このようなカバー付き磁石発電機では、外部の空気が空気取入れ口１５からカバー１３内に入り、回転子ヨーク２の底壁部２ｂに設けられた冷却風導入部１０の作用で冷却風導入通路１１を通して各通気孔２ｄから回転子ヨーク２の中に入り、電機子５を冷却した後、回転子ヨーク２の開口端２ｆからその外に出てカバー１３の周壁部１３ａの排気口１６から排気されるようになっている。
【００１０】
【特許文献１】
特公平６−９１７１８号公報
【００１１】
【発明が解決しようとする課題】
しかしながら、図１１に示す如き構造のカバー付き磁石発電機では、回転子ヨーク２の開口端２ｆからその外に出た熱風が矢印Ａで示すようにカバー１３内の底壁部１３ｂ側に戻って冷却風導入通路１１に入り、循環してしまい十分な冷却効果が得られない問題点があった。
【００１２】
本発明の目的は、熱風がカバー内で循環するのを防止できるカバー付き磁石発電機を提供することにある。
【００１３】
【課題を解決するための手段】
本発明は、周壁部と底壁部とを有するほぼカップ状の形状を有するように形成されて底壁部を貫通した複数の通気孔が該底壁部の外周部に沿って並ぶように設けられている回転子ヨークと該回転子ヨークの周壁部の内周に取り付けられた永久磁石とを有する磁石回転子と、該磁石回転子の内側に配置された電機子とを備え、回転子ヨークの底壁部の複数の通気孔の少なくとも一部に対して冷却風導入部が設けられ、冷却風導入部は、回転子ヨークの周壁部の開口方向と反対側に膨出した状態で対応する通気孔の少なくとも一部を回転子ヨークの外側から覆うように形成されていて、回転子ヨークの回転方向の前方側に開口するとともに対応する通気孔を通して回転子ヨークの内側に連通させられた冷却風導入通路が冷却風導入部の内側に形成されて磁石発電機が形成され、該磁石発電機の回転子ヨークの周壁部と底壁部に対して空隙を隔てて覆う周壁部と底壁部とを有するカバーが設けられ、カバーにはその内部に外気を供給する空気取入れ口が開口され、カバー内及び回転子ヨーク内の空気を外部に排出する排気口がカバーの周壁部と電機子の支持体との少なくとも一方に設けられているカバー付き磁石発電機を対象とする。
【００１４】
本発明に係るカバー付き磁石発電機では、回転子ヨークにはその周壁部とカバーの周壁部との間の空気を回転子ヨークの周壁部の外周に沿って排気口側に送風する送風ファンが設けられていることを特徴とする。
【００１５】
このように回転子ヨークの周壁部の外周に沿って排気口側に送風する送風ファンを設けると、回転子ヨークの開口端からその外に出た熱風が逆流して循環するのを防止でき、電機子の冷却を効率よく行うことができる。
【００１６】
この場合、送風ファンは、回転子ヨークとは別体で該回転子ヨークに取付けられていても、回転子ヨークに一体成形で設けられていても、いずれでもよい。
【００１７】
また、送風ファンが、冷却風導入部を兼ねたブレードを備えていて回転子ヨークの底壁部の外周から一部が径方向に張出して設けられていると、簡単な構造で、回転子ヨーク内への空気の取入れと、回転子ヨーク内で冷却した後の熱風の循環防止を図ることができる。
【００１８】
【発明の実施の形態】
図１及び図２（Ａ）（Ｂ）は本発明に係るカバー付き磁石発電機の実施の形態の第１例を示したもので、図１は本例のカバー付き磁石発電機の縦断面図、図２（Ａ）（Ｂ）は本例で用いている磁石発電機の底面図及び側面図である。なお、前述した図１０（Ａ）（Ｂ）及び図１１と対応する部分には、同一符号を付けて示している。
【００１９】
本例のカバー付き磁石発電機では、回転子ヨーク２にはその周壁部２ａとカバー１３の周壁部１３ａとの間の空気を回転子ヨーク２の周壁部２ａの外周に沿ってカバー１３の排気口１６側に送風する送風ファン１８が設けられている。送風ファン１８は回転子ヨーク２の周壁部２ａの外周に所定間隔でブレード１８ａが突設された構造になっている。
【００２０】
回転子ヨーク２の底壁部２ｂにネジ８で固定された環状の板９に、底壁部２ｂの各通気孔２ｄに対応して貫通孔９ａが設けられている。この板９に、各貫通孔９ａに対応して冷却風導入部１０が設けられている。各冷却風導入部１０は、環状の板９の回転子ヨーク２と反対側の面から回転子ヨーク２と反対側に膨出した状態で対応する貫通孔９ａの大部分を外側から覆うように形成されていて、各冷却風導入部１０の内側に形成された冷却風導入通路１１が対応する貫通孔９ａを通して回転子ヨーク２の底壁部の対応する通気孔２ｄに連通させられている。
【００２１】
本発明においては、回転子ヨーク２の回転方向の前方側に向かうに従って回転子ヨーク２の底壁部２ｂの外周側に向かうように回転子ヨーク２の径方向に対して傾斜した状態で冷却風導入部１０の回転子ヨーク２の外周側に位置する部分から回転子ヨーク２の外周側に延びる板状の翼部１０ａが、その板面を回転子ヨーク２の軸線と平行な方向に向けた状態で冷却風導入部１０に一体に設けられている。
【００２２】
図示の例では、また、冷却風導入部１０の天井部に、翼部１０ａとともに回転子ヨーク２の外周側に延びるように形成された延長部１０ｂが翼部１０ａと一体化された状態で設けられている。延長部１０ｂは、冷却風導入通路１１の開口部側に位置するその端面１０ｂ１を、回転子ヨーク２の回転方向の前方側に向かうに従って回転子ヨーク２の底壁部２ｂの外周側に徐々に近づけるように湾曲した形状に形成されていて、回転子４を底面から見たときの各冷却風導入部１０の輪郭形状がほぼ勾玉状を呈するように、各冷却風導入部１０が形成されている。
【００２３】
また図示の例では、回転子ヨーク２の補助通気孔２ｄ´に整合する貫通孔９ａ´が環状の板９に設けられ、回転子ヨーク２の底壁部２ｂの各補助通気孔２ｄ´と環状の板９の貫通孔９ａ´とを通して回転子ヨーク２の内外が連通させられている。
【００２４】
なお、図２において２ｅは、回転子ヨーク２を回転軸１７から抜き取るための工具を取り付けるために、回転子ヨーク２の底壁部２ｂに設けられたネジ孔である。
【００２５】
上記のように回転子ヨーク２の周壁部２ａの外周に沿ってカバー１３の排気口１６側に送風する送風ファン１８を設けると、回転子ヨーク２の開口端２ｆからその外に出た熱風が逆流して循環するのを防止でき、電機子５の冷却を効率よく行うことができる。
【００２６】
また、上記のように冷却風導入部１０を設けると、冷却風導入通路１１の断面形状を半円形状としていた図１０に示した磁石発電機よりも冷却風導入通路１１の断面積を大きくすることができる。
【００２７】
また上記のように、回転子ヨーク２の回転方向の前方側に向かうに従って回転子ヨーク２の底壁部２ｂの外周部に近づくように回転子ヨーク２の径方向に対して傾斜した状態でかつ底壁部２ｂから起立した状態で冷却風導入部１０の回転子ヨーク２の外周側に位置する部分から回転子ヨーク２の外周側に延びる翼部１０ａを冷却風導入部１０に一体に設けると、回転子ヨーク２が回転したときに該翼部１０ａに沿って大量の空気を冷却風導入通路１１内に導入することができ、このことと、上記のように冷却風導入通路１１の断面積が大きくなることとの相乗効果により、回転子ヨーク２内に導入される空気の量を増大させて、電機子５の冷却効果を高めることができる。
【００２８】
図３（Ａ）（Ｂ）及び図４は本発明で用いる送風ファン１８の一例を示したもので、図３（Ａ）（Ｂ）は本例の送風ファン１８の正面図及び側面図、図４は本例の送風ファン１８の斜視図である。
【００２９】
本例の送風ファン１８は、回転子ヨーク２の周壁部２ａの外周に嵌着するリング部１８ｂの外周に複数のブレード１８ａを一体に突設した形状になっている。
【００３０】
このような回転子ヨーク２とは別体の送風ファン１８は、回転子ヨーク２の周壁部２ａの外周に焼嵌め、圧入等で取付けられる。
【００３１】
図５（Ａ）（Ｂ）及び図６は本発明で用いる送風ファン１８の他の例を示したもので、図５（Ａ）（Ｂ）は本例の送風ファン１８を備えた回転子ヨーク２の側面図及び底面図、図６は本例の送風ファン１８を備えた回転子ヨーク２の斜視図である。
【００３２】
本例の送風ファン１８は、回転子ヨーク２の周壁部２ａの外周に複数のブレード１８ａを一体成形で突設して形成されている。
【００３３】
図７及び図８は本発明に係るカバー付き磁石発電機の実施の形態の第２例を示したもので、図７は本例のカバー付き磁石発電機の縦断面図、図８は本例で用いている送風ファンの斜視図である。なお、前述した図１乃至図６と対応する部分には、同一符号を付けて示している。
【００３４】
本例のカバー付き磁石発電機では、送風ファン１８は冷却風導入部１０を兼ねたブレード１８ａを備えていて、回転子ヨーク２の底壁部２ｂの外周から一部が径方向に張出して設けられている。即ち、本例の送風ファン１８は、回転子ヨーク２の周壁部２ａより小径の内輪１８ｃと、回転子ヨーク２の周壁部２ａより大径の外輪１８ｄとの間に冷却風導入部１０を兼ねた複数のブレード１８ａが各通気孔２ｄに対応して放射状に支持された構造になっている。各ブレード１８ａが回転方向に向かって開いて各冷却風導入部１０を兼ねていて、その内側の冷却風導入通路１１内に取り込んだ風を各通気孔２ｄに送り込むと共に外周側では回転子ヨーク２の周壁部２ａの外周に沿ってカバー１３の排気口１６側に送風するようになっている。このような送風ファン１８は、各ブレード１８ａの基端に設けられた取付け孔１９に通した図示しないネジで回転子ヨーク２の底壁部２ｂに固定されるようになっている。
【００３５】
このように送風ファン１８が、冷却風導入部１０を兼ねたブレード１８ａを備えていて回転子ヨーク２の底壁部２ｂの外周から一部が径方向に張出して設けられていると、簡単な構造で、回転子ヨーク２内への空気の取入れと、回転子ヨーク２内で冷却した後の熱風の循環防止を図ることができる。
【００３６】
図９は本発明に係るカバー付き磁石発電機の実施の形態の第３例を示した縦断面図である。なお、前述した図１乃至図８と対応する部分には、同一符号を付けて示している。
【００３７】
本例のカバー付き磁石発電機では、空気取入れ口１５がカバー１３の周壁部１３ａと底壁部１３ｂとのコーナ部に設けられている。また、排気口１６が回転子ヨーク２の開口端２ｆに対向する支持体１４に設けられている。支持体１４が原動機としての内燃機関のケースの場合は、該ケースを貫通せずに、その表面に沿って外に排出するようになっている。また、カバー１３の底壁部１３ｂには、回転軸１７の端部に対向する中心部にも空気取入れ口１５が設けられている。その他の構成は、図１等と同様の構成になっている。
【００３８】
このような構造でも、前述した例と同様の効果を得ることができる。
【００３９】
なお、本発明においては、空気取入れ口１５は送風ファン１８より上流側であればカバー１３の何れの位置に設けてもよい。また、排気口１６は送風ファン１８より下流側であればカバー１３や支持体１４の何れか一方にでも、双方にでも設けることができる。
【００４０】
【発明の効果】
本発明に係るカバー付き磁石発電機では、回転子ヨークにはその周壁部とカバーの周壁部との間の空気を回転子ヨークの周壁部の外周に沿って排気口側に送風する送風ファンを設けたので、回転子ヨークの開口端からその外に出た熱風が逆流して循環するのを防止でき、電機子の冷却を効率よく行うことができる。
【００４１】
この場合、送風ファンは、回転子ヨークとは別体で該回転子ヨークに取付けられていても、回転子ヨークに一体成形で設けられていても、いずれでもよい。
【００４２】
また、送風ファンが、冷却風導入部を兼ねたブレードを備えていて回転子ヨークの底壁部の外周から一部が径方向に張出して設けられていると、簡単な構造で、回転子ヨーク内への空気の取入れと、回転子ヨーク内で冷却した後の熱風の循環防止を図ることができる。
【図面の簡単な説明】
【図１】本発明に係るカバー付き磁石発電機の実施の形態の第１例を示した縦断面図である。
【図２】（Ａ）（Ｂ）は本例で用いている磁石発電機の底面図及び側面図である。
【図３】本発明で用いる送風ファンの一例を示した正面図及び側面図である。
【図４】この送風ファンの斜視図である。
【図５】本発明で用いる他の例の送風ファンを備えた回転子ヨークの側面図及び底面図である。
【図６】この例の送風ファンを備えた回転子ヨークの斜視図である。
【図７】本発明に係るカバー付き磁石発電機の実施の形態の第２例を示した縦断面図である。
【図８】この第２例で用いている送風ファンの斜視図である。
【図９】本発明に係るカバー付き磁石発電機の実施の形態の第３例を示した縦断面図である。
【図１０】（Ａ）（Ｂ）は従来の磁石発電機の底面図及び縦断面図である。
【図１１】従来のカバー付き磁石発電機の縦断面図である。
【符号の説明】
１磁石発電機
２回転子ヨーク
２ａ周壁部
２ｂ底壁部
２ｃボス部
２ｄ通気孔
２ｄ´ 補助通気孔
２ｅネジ孔
２ｆ開口端
３永久磁石
４磁石回転子
５電機子
６電機子鉄心
７電機子コイル
８ネジ
９板
１０冷却風導入部
１１冷却風導入通路
１２空隙
１３カバー
１３ａ周壁部
１３ｂ底壁部
１４支持体
１５空気取入れ口
１６排気口
１７回転軸
１７ａナット
１８送風ファン
１８ａブレード
１８ｂリング部
１８ｃ内輪
１８ｄ外輪
１９取付け孔[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a magnet generator with a cover provided with a cover that covers a peripheral wall portion and a bottom wall portion of a rotor yoke of the magnet generator with a gap therebetween.
[0002]
[Prior art]
As shown in FIGS. 10A and 10B, a conventional magnet generator 1 includes a rotor yoke 2 having a substantially cup-like shape having a peripheral wall 2a and a bottom wall 2b. The magnet rotor 4 includes a permanent magnet 3 mounted on the inner periphery of the peripheral wall 2a, and an armature 5 disposed inside the magnet rotor 4.
[0003]
The rotor yoke 2 has a boss 2c at the center of the bottom wall 2b, and the boss is attached to a rotating shaft of a prime mover (in most cases, an internal combustion engine) not shown.
[0004]
The armature 5 includes an armature core 6 and an armature coil 7 wound around the armature core. The armature 5 is fixed to a case of a prime mover and provided on an outer peripheral portion of the armature core 6. The magnetic pole portion is opposed to the permanent magnet 3 of the magnet rotor 4 via a predetermined gap.
[0005]
In this type of magnet generator 1, since the armature coil 7 generates heat due to a loss generated when a load current flows through the armature coil 7, in order to take out a large output from the generator, the armature coil 7 7 must be able to be cooled efficiently.
[0006]
Therefore, in Patent Document 1, as shown in the figure, a plurality of ventilation holes 2d, 2d,... Are formed so as to penetrate the bottom wall 2b of the rotor yoke 2 and to be arranged along the outer peripheral portion of the bottom wall 2b. An annular plate 9 fixed to the outer surface of the bottom wall 2b of the rotor yoke 2 with screws 8 is provided with cooling air introduction portions 10 corresponding to the ventilation holes 2d, and the cooling air inside each cooling air introduction portion 10 is provided. Cooling air is introduced into each ventilation hole 2d through the introduction passage 11, and three auxiliary ventilation holes 2d 'having a smaller diameter than the ventilation hole 2d are provided at intervals of 120 degrees between these six ventilation holes 2a. A proposed cooling structure was proposed.
[0007]
The cooling air introduction part 10 is formed so as to cover at least a part of the corresponding ventilation hole 2 d in a state of being bulged to the opposite side to the bottom wall part 2 b, and the cooling air formed inside the cooling air introduction part 10. The introduction passage 11 is provided so as to open to the front side in the rotation direction of the rotor yoke 2 (the direction of arrow A in FIG. 10).
[0008]
In such a magnet generator, since the rotor yoke 2 rotates in the direction of arrow A, the peripheral wall covering the peripheral wall 2a and the bottom wall 2b of the rotor yoke 2 with the gap 12 therebetween as shown in FIG. A cover 13 having a portion 13a and a bottom wall portion 13b is provided, and the cover 13 is fixed to a support 14 made of a case of the prime mover by screws or the like, not shown, to form a magnet generator with a cover. An air intake 15 is opened in the bottom wall 13 b of the cover 13, and an exhaust port 16 is opened in the peripheral wall 13 a of the cover 13. The boss 2c of the rotor yoke 2 is fitted on the rotating shaft 17 of the prime mover, and rotates together with the rotating shaft 17 by fastening a nut 17a.
[0009]
In such a magnet generator with a cover, external air enters the cover 13 from the air inlet 15 and the cooling air introduction passage is formed by the action of the cooling air introduction unit 10 provided on the bottom wall 2 b of the rotor yoke 2. 11, the rotor 5 enters the rotor yoke 2 through the ventilation holes 2 d, cools the armature 5, and then goes out of the rotor yoke 2 through the open end 2 f and exhausts through the exhaust port 16 of the peripheral wall 13 a of the cover 13. It is supposed to be.
[0010]
[Patent Document 1]
Japanese Patent Publication No. Hei 6-91718
[Problems to be solved by the invention]
However, in the magnet generator with a cover having a structure as shown in FIG. 11, the hot air flowing out from the open end 2f of the rotor yoke 2 returns to the bottom wall 13b side in the cover 13 as shown by an arrow A. There is a problem that the cooling air enters the cooling air introduction passage 11 and circulates, so that a sufficient cooling effect cannot be obtained.
[0012]
An object of the present invention is to provide a magnet generator with a cover that can prevent hot air from circulating in the cover.
[0013]
[Means for Solving the Problems]
According to the present invention, a plurality of ventilation holes formed to have a substantially cup-like shape having a peripheral wall portion and a bottom wall portion and penetrating the bottom wall portion are provided so as to be arranged along the outer peripheral portion of the bottom wall portion. A rotor having a rotor yoke, a permanent magnet attached to the inner periphery of a peripheral wall of the rotor yoke, and an armature disposed inside the magnet rotor. A cooling air introduction portion is provided for at least a part of the plurality of ventilation holes in the bottom wall portion, and the cooling air introduction portion corresponds to a state in which the cooling air introduction portion bulges in a direction opposite to the opening direction of the peripheral wall portion of the rotor yoke. Cooling formed so as to cover at least a part of the ventilation hole from the outside of the rotor yoke, opened to the front side in the rotation direction of the rotor yoke, and communicated with the inside of the rotor yoke through the corresponding ventilation hole. Wind introduction passage formed inside cooling air introduction section A magnet generator is formed, and a cover having a peripheral wall and a bottom wall that covers the peripheral wall and the bottom wall of the rotor yoke of the magnet generator with a gap therebetween is provided, and the cover is provided with the cover. A cover in which an air intake port for supplying outside air is opened, and an exhaust port for discharging air inside the cover and the rotor yoke to the outside is provided on at least one of the peripheral wall portion of the cover and the armature support. Targeted magnet generators.
[0014]
In the magnet generator with cover according to the present invention, the rotor yoke has a blower fan that blows air between the peripheral wall portion and the peripheral wall portion of the cover to the exhaust port side along the outer periphery of the peripheral wall portion of the rotor yoke. It is characterized by being provided.
[0015]
By providing a blower fan that blows air to the exhaust port side along the outer periphery of the peripheral wall of the rotor yoke, it is possible to prevent hot air that has flowed out of the opening end of the rotor yoke from flowing back and circulating, The armature can be efficiently cooled.
[0016]
In this case, the blower fan may be attached to the rotor yoke separately from the rotor yoke, or may be provided integrally with the rotor yoke.
[0017]
Further, if the blower fan is provided with a blade also serving as a cooling air introduction part and a part thereof is radially extended from the outer periphery of the bottom wall of the rotor yoke, the rotor yoke has a simple structure. It is possible to take in air into the inside and prevent circulation of hot air after cooling in the rotor yoke.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
1 and 2A and 2B show a first embodiment of a magnet generator with a cover according to the present invention, and FIG. 1 is a longitudinal sectional view of the magnet generator with a cover of the present embodiment. FIGS. 2A and 2B are a bottom view and a side view of the magnet generator used in this example. Parts corresponding to those in FIGS. 10A and 10B and FIG. 11 are denoted by the same reference numerals.
[0019]
In the magnet generator with a cover of the present embodiment, the air between the peripheral wall 2a of the rotor yoke 2 and the peripheral wall 13a of the cover 13 is exhausted from the cover 13 along the outer periphery of the peripheral wall 2a of the rotor yoke 2. A blower fan 18 that blows air to the opening 16 is provided. The blower fan 18 has a structure in which blades 18a protrude from the outer periphery of the peripheral wall 2a of the rotor yoke 2 at predetermined intervals.
[0020]
An annular plate 9 fixed to the bottom wall 2b of the rotor yoke 2 with screws 8 is provided with through holes 9a corresponding to the respective ventilation holes 2d of the bottom wall 2b. The plate 9 is provided with cooling air introduction portions 10 corresponding to the respective through holes 9a. Each of the cooling air introduction portions 10 bulges from the surface of the annular plate 9 opposite to the rotor yoke 2 to the opposite side to the rotor yoke 2 so as to cover most of the corresponding through holes 9a from outside. The cooling air introduction passage 11 formed inside each cooling air introduction part 10 is communicated with the corresponding ventilation hole 2d in the bottom wall of the rotor yoke 2 through the corresponding through hole 9a.
[0021]
In the present invention, the cooling air is inclined with respect to the radial direction of the rotor yoke 2 so as to move toward the outer side of the bottom wall portion 2b of the rotor yoke 2 toward the front side in the rotation direction of the rotor yoke 2. A plate-like wing portion 10a extending from the portion of the introduction portion 10 located on the outer peripheral side of the rotor yoke 2 to the outer peripheral side of the rotor yoke 2 has its plate surface oriented in a direction parallel to the axis of the rotor yoke 2. In a state, it is provided integrally with the cooling air introduction unit 10.
[0022]
In the illustrated example, an extension 10b formed to extend to the outer peripheral side of the rotor yoke 2 together with the wing 10a is provided on the ceiling of the cooling air introduction unit 10 in a state integrated with the wing 10a. Have been. The extension portion 10b gradually moves its end face 10b1 located on the opening side of the cooling air introduction passage 11 toward the outer peripheral side of the bottom wall 2b of the rotor yoke 2 toward the front side in the rotation direction of the rotor yoke 2. Each cooling air introduction part 10 is formed so as to be curved so as to be close to each other, and so that the outline shape of each cooling air introduction part 10 when the rotor 4 is viewed from the bottom surface has a substantially jagged shape. I have.
[0023]
Further, in the illustrated example, a through hole 9 a ′ matching the auxiliary air hole 2 d ′ of the rotor yoke 2 is provided in the annular plate 9, and each of the auxiliary air holes 2 d ′ of the bottom wall 2 b of the rotor yoke 2 is formed in an annular shape. The inside and outside of the rotor yoke 2 are communicated with each other through the through hole 9a 'of the plate 9 of FIG.
[0024]
In FIG. 2, reference numeral 2e denotes a screw hole provided in the bottom wall 2b of the rotor yoke 2 for attaching a tool for removing the rotor yoke 2 from the rotation shaft 17.
[0025]
As described above, when the blower fan 18 that blows air to the exhaust port 16 side of the cover 13 along the outer periphery of the peripheral wall portion 2a of the rotor yoke 2 is provided, the hot air that has flowed out from the opening end 2f of the rotor yoke 2 Backflow and circulation can be prevented, and the armature 5 can be cooled efficiently.
[0026]
Further, when the cooling air introduction section 10 is provided as described above, the sectional area of the cooling air introduction passage 11 is made larger than that of the magnet generator shown in FIG. be able to.
[0027]
Also, as described above, the rotor yoke 2 is inclined with respect to the radial direction of the rotor yoke 2 so as to approach the outer peripheral portion of the bottom wall 2b of the rotor yoke 2 toward the front side in the rotation direction of the rotor yoke 2 and When the wing 10a extending from the portion of the cooling air introducing portion 10 located on the outer peripheral side of the rotor yoke 2 to the outer peripheral side of the rotor yoke 2 is provided integrally with the cooling air introducing portion 10 while standing up from the bottom wall portion 2b. When the rotor yoke 2 rotates, a large amount of air can be introduced into the cooling air introduction passage 11 along the wing portion 10a. Is increased, the amount of air introduced into the rotor yoke 2 is increased, and the cooling effect of the armature 5 can be enhanced.
[0028]
3 (A), 3 (B) and 4 show an example of the blower fan 18 used in the present invention, and FIGS. 3 (A) and 3 (B) are a front view, a side view, and a view of the blower fan 18 of the present example. 4 is a perspective view of the blower fan 18 of the present example.
[0029]
The blower fan 18 of the present example has a shape in which a plurality of blades 18a are integrally protruded on the outer periphery of a ring portion 18b fitted on the outer periphery of the peripheral wall portion 2a of the rotor yoke 2.
[0030]
The blower fan 18 separate from the rotor yoke 2 is shrink-fitted onto the outer periphery of the peripheral wall 2a of the rotor yoke 2 and attached by press fitting or the like.
[0031]
FIGS. 5A and 5B show another example of the blower fan 18 used in the present invention, and FIGS. 5A and 5B show a rotor yoke provided with the blower fan 18 of the present example. FIG. 6 is a perspective view of the rotor yoke 2 having the blower fan 18 of the present embodiment.
[0032]
The blower fan 18 of the present embodiment is formed by integrally protruding a plurality of blades 18a on the outer periphery of the peripheral wall 2a of the rotor yoke 2.
[0033]
7 and 8 show a second embodiment of the magnet generator with cover according to the present invention. FIG. 7 is a longitudinal sectional view of the magnet generator with cover of the present embodiment, and FIG. FIG. 4 is a perspective view of a blower fan used in FIG. Parts corresponding to those in FIGS. 1 to 6 are denoted by the same reference numerals.
[0034]
In the magnet generator with a cover of the present example, the blower fan 18 includes the blade 18 a also serving as the cooling air introduction unit 10, and is provided so as to partially protrude from the outer periphery of the bottom wall 2 b of the rotor yoke 2 in the radial direction. Have been. That is, the blower fan 18 of the present example also serves as the cooling air introduction part 10 between the inner ring 18 c having a smaller diameter than the peripheral wall 2 a of the rotor yoke 2 and the outer ring 18 d having a larger diameter than the peripheral wall 2 a of the rotor yoke 2. A plurality of blades 18a are radially supported corresponding to the respective ventilation holes 2d. Each blade 18a opens in the rotation direction and also serves as each cooling air introduction unit 10, and the air taken in the cooling air introduction passage 11 inside is sent to each ventilation hole 2d, and the rotor yoke 2 Is blown to the exhaust port 16 side of the cover 13 along the outer periphery of the peripheral wall portion 2a. The blower fan 18 is fixed to the bottom wall 2b of the rotor yoke 2 with a screw (not shown) passing through a mounting hole 19 provided at the base end of each blade 18a.
[0035]
As described above, when the blower fan 18 is provided with the blade 18a also serving as the cooling air introduction unit 10 and partially provided radially from the outer periphery of the bottom wall 2b of the rotor yoke 2, it is simple. With this structure, it is possible to take in air into the rotor yoke 2 and to prevent circulation of hot air after cooling in the rotor yoke 2.
[0036]
FIG. 9 is a longitudinal sectional view showing a third example of the embodiment of the magnet generator with cover according to the present invention. Parts corresponding to those in FIGS. 1 to 8 described above are denoted by the same reference numerals.
[0037]
In the magnet generator with a cover of this example, the air intake 15 is provided at the corner between the peripheral wall 13 a and the bottom wall 13 b of the cover 13. Further, an exhaust port 16 is provided on the support 14 facing the opening end 2 f of the rotor yoke 2. In the case where the support 14 is a case of an internal combustion engine as a prime mover, the support 14 is discharged outside along the surface without penetrating the case. An air inlet 15 is also provided in the bottom wall 13 b of the cover 13 at the center opposite to the end of the rotating shaft 17. Other configurations are the same as those in FIG.
[0038]
Even with such a structure, the same effect as in the above-described example can be obtained.
[0039]
In the present invention, the air intake 15 may be provided at any position on the cover 13 as long as the air intake 15 is located upstream of the blower fan 18. Further, the exhaust port 16 can be provided on either the cover 13 or the support 14 or on both sides as long as the exhaust port 16 is on the downstream side of the blower fan 18.
[0040]
【The invention's effect】
In the magnet generator with a cover according to the present invention, the rotor yoke has a blower fan that blows air between the peripheral wall portion and the peripheral wall portion of the cover to the exhaust port side along the outer periphery of the peripheral wall portion of the rotor yoke. With the provision, the hot air flowing out of the opening end of the rotor yoke to the outside can be prevented from flowing backward and circulating, and the armature can be cooled efficiently.
[0041]
In this case, the blower fan may be attached to the rotor yoke separately from the rotor yoke, or may be provided integrally with the rotor yoke.
[0042]
In addition, if the blower fan is provided with a blade that also serves as a cooling air introduction portion and is provided so as to partially extend radially from the outer periphery of the bottom wall portion of the rotor yoke, the rotor yoke has a simple structure. It is possible to take in air into the inside and prevent circulation of hot air after cooling in the rotor yoke.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first example of an embodiment of a magnet generator with a cover according to the present invention.
FIGS. 2A and 2B are a bottom view and a side view of a magnet generator used in this example.
FIG. 3 is a front view and a side view showing an example of a blower fan used in the present invention.
FIG. 4 is a perspective view of the blower fan.
FIG. 5 is a side view and a bottom view of a rotor yoke provided with another example of a blower fan used in the present invention.
FIG. 6 is a perspective view of a rotor yoke provided with the blower fan of this example.
FIG. 7 is a longitudinal sectional view showing a second example of the embodiment of the magnet generator with a cover according to the present invention.
FIG. 8 is a perspective view of a blower fan used in the second example.
FIG. 9 is a longitudinal sectional view showing a third example of the embodiment of the magnet generator with a cover according to the present invention.
10A and 10B are a bottom view and a vertical sectional view of a conventional magnet generator.
FIG. 11 is a longitudinal sectional view of a conventional magnet generator with a cover.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Magnet generator 2 Rotor yoke 2a Peripheral wall part 2b Bottom wall part 2c Boss part 2d Vent hole 2d 'Auxiliary vent hole 2e Screw hole 2f Open end 3 Permanent magnet 4 Magnet rotor 5 Armature 6 Armature core 7 Armature coil 8 Screw 9 Plate 10 Cooling air introduction unit 11 Cooling air introduction passage 12 Void 13 Cover 13a Peripheral wall 13b Bottom wall 14 Support 15 Air intake 16 Exhaust port 17 Rotary shaft 17a Nut 18 Blow fan 18a Blade 18b Ring 18c Inner ring 18d Outer ring 19 Mounting hole

Claims

A plurality of ventilation holes formed to have a substantially cup-like shape having a peripheral wall portion and a bottom wall portion and penetrating the bottom wall portion are provided so as to be arranged along the outer peripheral portion of the bottom wall portion. A magnet rotor having a rotor yoke and a permanent magnet attached to an inner periphery of a peripheral wall portion of the rotor yoke; and an armature disposed inside the magnet rotor. A cooling air introduction portion is provided for at least a part of the plurality of ventilation holes of the wall portion, and the cooling air introduction portion corresponds to a state in which the cooling air introduction portion bulges in a direction opposite to an opening direction of a peripheral wall portion of the rotor yoke. The rotor yoke is formed so as to cover at least a part of the rotor yoke from the outside, and opens to the front side in the rotation direction of the rotor yoke and communicates with the inside of the rotor yoke through the corresponding ventilation hole. Cooling air introduction passage A magnet generator is formed inside the wind introduction section, and a peripheral wall portion and a bottom wall portion that cover the rotor yoke of the magnet generator with a gap between the peripheral wall portion and the bottom wall portion are formed. A cover having an opening for supplying outside air to the inside of the cover, and an exhaust port for discharging air inside the cover and the rotor yoke to the outside is provided on the peripheral wall portion of the cover. And a magnet generator with a cover provided on at least one of the armature support and
The rotor yoke is provided with a blower fan for blowing air between the peripheral wall portion and the peripheral wall portion of the cover to the exhaust port side along the outer periphery of the peripheral wall portion of the rotor yoke. A magnet generator with a cover, characterized in that:

The magnet generator with a cover according to claim 1, wherein the blower fan is attached to the rotor yoke separately from the rotor yoke.

The magnet generator with a cover according to claim 1, wherein the blower fan is provided integrally with the rotor yoke.

2. The fan according to claim 1, wherein the blower fan includes a blade that also serves as the cooling air introduction unit, and a part of the rotor yoke is radially extended from an outer periphery of the bottom wall of the rotor yoke. Magnet generator with cover as described.