JP3986623B2

JP3986623B2 - Rotating electric machine

Info

Publication number: JP3986623B2
Application number: JP16269097A
Authority: JP
Inventors: 克也世古; 賢一伊藤
Original assignee: Toshiba Corp; Toshiba Digital Media Engineering Corp
Current assignee: Toshiba Corp; Toshiba Development and Engineering Corp
Priority date: 1997-06-19
Filing date: 1997-06-19
Publication date: 2007-10-03
Anticipated expiration: 2017-06-19
Also published as: JPH1118357A

Description

【０００１】
【発明の属する技術分野】
本発明は回転体の支承がすべり軸受によって行われる回転電機に関する。
【０００２】
【従来の技術】
この種の回転電機の基本的構成を図８に示す。この図８において、１は固定子を示しており、鉄心２に電機子巻線３を巻装して構成されている。この固定子１の鉄心２には、内周部に軸受ハウジング４が取付けられており、この軸受ハウジング４が支持板でもあるＰＣ板５に取付け固定されている。
軸受ハウジング４には、内部にすべり軸受６が収納保持されており、このすべり軸受６の内部に回転軸７が挿入されて回転可能に支承されている。
【０００３】
回転軸７には回転子ホルダ８が取付けられており、この回転子ホルダ８に回転子９のヨーク１０が取付けられている。回転子９は、ヨーク１０と、これの周囲部の内周面に取付けられた磁石１１とから成るもので、その磁石１１が内周部を上記固定子の鉄心２の外周部に径方向に対向させている。
この構成で、磁石１１と固定子１の鉄心２との間で所定の磁気回路が形成され、この磁気回路により生じる回転駆動力によって、回転子９が回転軸７を伴い回転される。
【０００４】
このような回転電機においては、すべり軸受６とこれが支承した回転体（この場合、回転軸７）との間に、微小とはいえ、ある程度の隙間を確保する必要がある。この隙間によって、回転体（回転軸７）の回転が円滑に行われ、すべり軸受６に対する回転体の組付けも容易に行われる。ところが、そのためとはいっても、すべり軸受６と回転体との間に隙間があると、回転体が、その隙間の分、図９に示すように振れて回転してしまう。
【０００５】
そこで、従来、図１０及び図１１に示すように、回転子９の磁石１１の一部と軸方向に対向させて、ＰＣ板５上に鉄片等の磁性体１２を設けることが考えられた。このものによれば、回転子９の磁石１１が磁性体１２と対向する部分で該磁性体１２に磁力を及ぼしてそれに近付くようになることにより、回転子９が回転軸７を伴い定常的に傾きつつ回転することになり、回転軸７すなわち回転体の上述のような振れがなくなる。
【０００６】
【発明が解決しようとする課題】
しかしながら、上述のものでは、回転体が傾くことによって、すべり軸受６に回転体が点接触し、面圧が増加する。これによって、回転力に損失が生じ、回転体の寿命も低下するという問題点を有していた。又、磁性体１２を特別に必要とする分、部品点数が増加し、組立てが煩雑になると共に、コスト高にもなるという問題点を有していた。
【０００７】
本発明は上述の事情に鑑みてなされたものであり、従ってその目的は、すべり軸受で支承する回転体を傾かせず、部品点数を増加させることもなくして、その回転体の振れをなくすことのできる回転電機を提供するにある。
【０００８】
【課題を解決するための手段】
上記目的を達成するために、本発明の回転電機は、第１に、鉄心に電機子巻線が巻装された固定子と、この固定子との間ですべり軸受により支承され、前記固定子の鉄心と径方向に対向する磁石を有する回転子とを具えるものにおいて、前記固定子の鉄心のすべり軸受構成部と磁石対向部とを相対的に偏心させることにより、前記固定子の鉄心と回転子の磁石との対向間隔を径方向の一方側で狭く、他方側で広くなるようにしたことを特徴とする（請求項１の発明）。
本発明の回転電機は、第２に、鉄心に電機子巻線が巻装された固定子と、この固定子との間ですべり軸受により支承され、前記固定子の鉄心と径方向に対向する磁石を有する回転子とを具え、その回転子が固定子の外側に位置するアウターロータ形のものにおいて、
前記すべり軸受の外周部を回転子の回転中心に対し偏心させることにより、前記固定子の鉄心と回転子の磁石との対向間隔を径方向の一方側で狭く、他方側で広くなるようにしたことを特徴とする（請求項２の発明）。
【０００９】
これらのものによれば、回転子の磁石が固定子の鉄心との径方向の対向間隔を狭くした一方側において、他の部分よりも強い吸引力を固定子の鉄心に及ぼしてそれに近付くようになることにより、回転子が定常的に径方向の他方側に片寄せられて回転する。
【００１０】
【発明の実施の形態】
以下、本発明の第１実施例につき、図１及び図２を参照して説明する。
まず図１には支持板を兼ねるＰＣ板２１を示しており、これには図中中央部にハウジング嵌合孔２２を形成している。これに対して、固定子２３は鉄心２４と電機子巻線２５とから成るもので、そのうちの鉄心２４は、詳細には図２に示すように、環状部２６から外方へ複数の突極２７を放射状に突出させて形成したものであり、その各突極２７に電機子巻線２５を巻装している。
【００１１】
又、鉄心２４の環状部２６の内部に存する孔２８の周縁部は鉄心２４の内周部であり、この鉄心２４の内周部（孔２８）を、環状部２６の図中右側部分の厚みＴ1 と図中左側部分の厚みＴ2 との違いで明らかなように、鉄心２４の外周部である突極２７の各先端面に対し図中左側に偏心させて形成している。この鉄心２４の内周部には軸受ハウジング２９を嵌合して取付けており、この軸受ハウジング２９を前記ＰＣ板２１のハウジング嵌合孔２２に嵌合して取付け、これによって、固定子２３を軸受ハウジング２９を介しＰＣ板２１に取付けている。
【００１２】
軸受ハウジング２９には、内部にすべり軸受３０とすべり軸受３１とを上下に収納保持しており、そのうちのすべり軸受３０はラジアル軸受であって円筒状、すべり軸受３１はスラスト軸受であって円板状のものであり、ともに軸受メタルから成っている。
【００１３】
しかして、すべり軸受３０の内部には回転体である回転軸３２を下端がすべり軸受３１に当たるまで挿入して回転可能に支承している。又、回転軸３２の上端部には回転子３３のヨーク３４を取付けている。回転子３３は、ヨーク３４と、これの周囲部の内周面に取付けた磁石３５とから成るものであり、その磁石３５の内周部を前記固定子２３の鉄心２４の外周部（突極２７の各先端面）に径方向に対向させている。すなわち、本実施例の回転電機は、回転子３３が固定子２３の外側に位置するアウターロータ形となっている。
【００１４】
ここで、鉄心２４の内周部（孔２８）を鉄心２４の外周部（突極２７の各先端面）に対し図中左側に偏心させて形成したのは既述のごとくであり、これに対して、上述のごとく支承した回転軸３２は鉄心２４の内周部（孔２８）と同心で、これに取付けた回転子３３は回転軸３２と同心であると共に鉄心２４の内周部（孔２８）とも同心である。この結果、回転子３３の回転中心に対して固定子２３の鉄心２４の外周部が図中右側に偏心し、これによって、固定子２３の鉄心２４と回転子３３の磁石３５との対向間隔を、図中右側のギャップＧ1 と図中左側のギャップＧ2 との違いで示すように、径方向の一方側（図中右側）で狭く、他方側（図中左側）で広くなるようにしている。
【００１５】
次に、上記構成のものの作用を述べる。
回転子３３の磁石３５が固定子２３の鉄心２４との径方向の対向間隔を狭くした一方側においては、他の部分よりも強い吸引力が固定子２３の鉄心２４に及ぶ。これによって磁石３５が鉄心２４に近付き、回転子３３は回転軸３２を伴い径方向の他方側に片寄せられる。従って、磁石３５と鉄心２４との間で形成される磁気回路により生じる回転駆動力によって回転子３３が回転されるときも、回転子３３は回転軸３２を伴い定常的に径方向の他方側に片寄せられた状態で回転する。この回転子３３の片寄せは上述のごとく径方向であり、軸方向と平行なまま行われるので、回転軸３２（回転体）が従来のもののように傾くことはない。
【００１６】
よって、回転体がすべり軸受３０に点接触するというようなこともなく、面圧が増加することがないので、回転力に損失を生じることが避けられ、回転体の寿命が低下することも避けられる。又、従来のもののように磁性体を特別に必要とすることもないので、部品点数の増加を避けることができ、組立てを容易にできると共に、コスト安にもすることができる。
【００１７】
なお、鉄心２４の内周部はすべり軸受３０を有するすべり軸受構成部であり、外周部は回転子３３の磁石３５と対向する磁石対向部であって、上記構成では、そのすべり軸受構成部を磁石対向部に対し偏心させて形成したが、これとは逆に、磁石対向部をすべり軸受構成部に対し偏心させて形成しても良いもので、要するにそれらは相対的に偏心させて形成してあれば良いものである。
【００１８】
以上に対して、図３は本発明の第１参考例を示すもので、第１実施例と相違する点のみを述べれば、前述の軸受ハウジング２９に代えて用いる軸受ハウジング４１の固定子鉄心２４との嵌合部である外周部４１ａを、軸受ハウジング４１の図中右側部分の厚みＴ3 と図中左側部分の厚みＴ4 との違いで明らかなように、回転子３３の回転中心に対し図中右側に偏心させて形成した点にある。
【００１９】
このようにしても、第１実施例同様に、回転子３３の回転中心に対して固定子２３の鉄心２４の外周部を図中右側に偏心させ得、固定子２３の鉄心２４と回転子３３の磁石３５との対向間隔を、ギャップＧ1 とギャップＧ2 との違いで示すように、径方向の一方側（図中右側）で狭く、他方側（図中左側）で広くなるようにし得るもので、第１実施例同様の作用効果を得ることができる。
【００２０】
図４は本発明の第２実施例を示すもので、これも第１実施例と相違する点のみを述べれば、前述のすべり軸受３０に代えて用いるすべり軸受５１の外周部５１ａを、すべり軸受５１の図中右側部分の厚みＴ5 と図中左側部分の厚みＴ5 との違いで明らかなように、回転子３３の回転中心に対し図中右側に偏心させて形成した点にある。
【００２１】
このようにしても、やはり第１実施例同様に、回転子３３の回転中心に対して固定子２３の鉄心２４の外周部を図中右側に偏心させ得、固定子２３の鉄心２４と回転子３３の磁石３５との対向間隔を、ギャップＧ1 とギャップＧ2 との違いで示すように、径方向の一方側（図中右側）で狭く、他方側（図中左側）で広くなるようにし得るのであり、第１実施例同様の作用効果を得ることができる。
【００２２】
図５は本発明の第２参考例を示すもので、これも第１実施例と相違する点のみを述べれば、前述の突極２７に代えて固定子２３の鉄心２４に具える突極のうちの、１群（図中右側）の複数個（図示例は３個）の突極６１ａの径方向長さＬ1 を、他の突極６１ｂのそれＬ2 より長くした点にある。
【００２３】
このようにしても、やはり第１実施例同様に、回転子３３の回転中心に対して固定子２３の鉄心２４の外周部を図中右側に偏心させ得、固定子２３の鉄心２４と回転子３３の磁石３５との対向間隔を、ギャップＧ1 とギャップＧ2 との違いで示すように、径方向の一方側（図中右側）で狭く、他方側（図中左側）で広くなるようにし得るもので、第１実施例同様の作用効果を得ることができる。
なお、この場合、径方向長さを他の突極６１ｂより長くする固定子２３の鉄心２４の突極６１ａは１個であっても良い。
【００２４】
図６は本発明の第３参考例を示すもので、これも第１実施例と相違する点のみを述べれば、これも前述の突極２７に代えて固定子２３の鉄心２４に具える突極のうちの、１群（図中右側）の複数個（図示例は３個）の突極７１ａの径方向長さＬ3 を、他の突極７１ｂのそれＬ4 より短くした点にある。
【００２５】
このようにすることにより、回転子３３の回転中心に対して固定子２３の鉄心２４の外周部を図中左側に偏心させ得、固定子２３の鉄心２４と回転子３３の磁石３５との対向間隔を、図中左側のギャップＧ3 と図中右側のギャップＧ4 との違いで示すように、径方向の一方側（図中左側）で狭く、他方側（図中右側）で広くなるようにし得るもので、このようにしても、第１実施例同様の作用効果を得ることができる。
なお、この場合も、径方向長さを他の突極７１ｂより短くする固定子２３の鉄心２４の突極７１ａは１個であっても良い。
【００２６】
図７は本発明の第４参考例を示すもので、これも第１実施例と相違する点のみを述べれば、固定子２３の鉄心２４を回転子３３の回転中心に対し図中右側に偏心させて取付けた点にある。詳細には、このものの場合、前述の孔２８に代わって固定子２３の鉄心２４の取付孔である孔８１を図中左右に長い長孔状に形成し、回転子３３の回転中心に対して、孔８１の長手方向（図中右側）に固定子２３の鉄心２４を偏心させて取付けている。
【００２７】
このようにしても、やはり第１実施例同様に、回転子３３の回転中心に対して固定子２３の鉄心２４の外周部を図中右側に偏心させ得、固定子２３の鉄心２４と回転子３３の磁石３５との対向間隔を、ギャップＧ1 とギャップＧ2 との違いで示すように、径方向の一方側（図中右側）で狭く、他方側（図中左側）で広くなるようにし得るもので、第１実施例同様の作用効果を得ることができる。
【００２９】
このほか、本発明は上記し且つ図面に示した実施例にのみ限定されるものではなく、例えば、回転軸３２は支持板に回転不能状態に取付けられる固定軸に変え、この固定軸の外周にすべり軸受を圧嵌保持し、該すべり軸受の外周に回転子を嵌合して回転可能に支承するようにしても良い。この場合、傾き、振れが防止される回転体は回転子である。
【００３０】
【発明の効果】
以上の記述で明らかなように、本発明の回転電機によれば、すべり軸受で支承する回転体を傾かせず、部品点数を増加させることもなくして、その回転体の振れをなくすことができもので、それにより、回転力に損失を生じることを避け得、又、回転体の寿命が低下するようなことも避け得て、更に、組立てを容易にでき、コスト安にもできるという優れた効果を奏する。
【図面の簡単な説明】
【図１】本発明の第１実施例を示す縦断面図
【図２】図１のＡ−Ａ線に沿う横断面図
【図３】本発明の第１参考例を示す図２相当図
【図４】本発明の第２実施例を示す図２相当図
【図５】本発明の第２参考例を示す図２相当図
【図６】本発明の第３参考例を示す図２相当図
【図７】本発明の第４参考例を示す図２相当図
【図８】従来例を示す図１相当図
【図９】回転体の振れを説明するための部分拡大縦断面図
【図１０】異なる従来例を示す図１相当図
【図１１】磁性体の配置を示す平面図
【符号の説明】
２３は固定子、２４は鉄心、２５は電機子巻線、２８は孔（すべり軸受構成部）、３０はすべり軸受、３２は回転軸、３３は回転子、３５は磁石、Ｇ1 ，Ｇ2 はギャップ、４１は軸受ハウジング、４１ａは軸受ハウジングの外周部（固定子鉄心との嵌合部）、５１はすべり軸受、５１ａはすべり軸受の外周部、６１ａ，６１ｂ，７１ａ，７１ｂは突極、Ｌ1 〜Ｌ4 は突極の径方向長さ、Ｇ3 ，Ｇ4 はギャップ、８１は長孔（固定子の鉄心の取付孔）を示す。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotating electrical machine in which a rotating body is supported by a slide bearing.
[0002]
[Prior art]
A basic configuration of this type of rotating electric machine is shown in FIG. In FIG. 8, reference numeral 1 denotes a stator, which is configured by winding an armature winding 3 around an iron core 2. A bearing housing 4 is attached to the inner periphery of the iron core 2 of the stator 1, and the bearing housing 4 is attached and fixed to a PC plate 5 that is also a support plate.
A sliding bearing 6 is housed and held in the bearing housing 4. A rotating shaft 7 is inserted into the sliding bearing 6 and is rotatably supported.
[0003]
A rotor holder 8 is attached to the rotary shaft 7, and a yoke 10 of the rotor 9 is attached to the rotor holder 8. The rotor 9 is composed of a yoke 10 and a magnet 11 attached to the inner peripheral surface of the periphery of the yoke 10, and the magnet 11 is radially connected to the outer peripheral portion of the iron core 2 of the stator. They are facing each other.
With this configuration, a predetermined magnetic circuit is formed between the magnet 11 and the iron core 2 of the stator 1, and the rotor 9 is rotated with the rotating shaft 7 by the rotational driving force generated by the magnetic circuit.
[0004]
In such a rotating electrical machine, it is necessary to secure a certain gap between the sliding bearing 6 and the rotating body (in this case, the rotating shaft 7) supported by the sliding bearing 6, although it is minute. By this gap, the rotating body (rotating shaft 7) is smoothly rotated, and the rotating body is easily assembled to the slide bearing 6. However, for this reason, if there is a gap between the slide bearing 6 and the rotating body, the rotating body swings and rotates as shown in FIG.
[0005]
Therefore, conventionally, as shown in FIGS. 10 and 11, it has been considered to provide a magnetic body 12 such as an iron piece on the PC plate 5 so as to face a part of the magnet 11 of the rotor 9 in the axial direction. According to this, the magnet 11 of the rotor 9 exerts a magnetic force on the magnetic body 12 at a portion facing the magnetic body 12 so as to approach the magnetic body 12, so that the rotor 9 is constantly accompanied by the rotating shaft 7. The rotating shaft 7 is rotated while being inclined, and the above-described vibration of the rotating shaft 7, that is, the rotating body is eliminated.
[0006]
[Problems to be solved by the invention]
However, in the above-mentioned thing, when a rotary body inclines, a rotary body will make point contact with the slide bearing 6, and a surface pressure will increase. As a result, the rotational force is lost, and the life of the rotating body is also reduced. Further, since the magnetic body 12 is specially required, the number of parts is increased, and the assembly becomes complicated and the cost is increased.
[0007]
The present invention has been made in view of the above circumstances, and therefore the object thereof is not to tilt the rotating body supported by the slide bearing, to increase the number of parts, and to eliminate the swinging of the rotating body. Is to provide a rotating electrical machine that can be used.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a rotating electric machine according to the present invention is firstly supported by a stator having an armature winding wound around an iron core and a sliding bearing between the stator, and the stator. in those Ru comprising a rotor having a magnet facing the iron core and radially by relatively eccentrically and sliding bearing member and the magnet opposing portion of the iron core of the stator, and the iron core of the stator The interval between the rotor and the magnet is narrowed on one side in the radial direction and widened on the other side (invention of claim 1).
Second, the rotating electrical machine of the present invention is supported by a plain bearing between a stator having an armature winding wound around an iron core and the stator, and is opposed to the iron core of the stator in the radial direction. In an outer rotor type comprising a rotor having a magnet and the rotor is located outside the stator ,
By decentering the outer periphery of the plain bearing with respect to the rotation center of the rotor, the facing interval between the stator iron core and the rotor magnet is narrowed on one side in the radial direction and widened on the other side. (Invention of claim 2 ).
[0009]
According to one of these, on one side that narrows the facing distance in the radial direction of the iron core of the magnet of the rotor stator, approaches it exerts a strong attraction force than other portions iron core of the stator As a result, the rotor is steadily shifted to the other side in the radial direction and rotated.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
First, FIG. 1 shows a PC plate 21 which also serves as a support plate, and a housing fitting hole 22 is formed in the central portion in the drawing. On the other hand, the stator 23 is composed of an iron core 24 and an armature winding 25, and the iron core 24 includes a plurality of salient poles outward from the annular portion 26 as shown in detail in FIG. 27 is formed by projecting radially, and armature windings 25 are wound around the respective salient poles 27.
[0011]
Further, the peripheral portion of the hole 28 existing inside the annular portion 26 of the iron core 24 is the inner peripheral portion of the iron core 24, and the inner peripheral portion (hole 28) of the iron core 24 is the thickness of the right portion of the annular portion 26 in the figure. As apparent from the difference between T1 and the thickness T2 of the left portion in the figure, each tip face of the salient pole 27, which is the outer peripheral portion of the iron core 24, is formed to be eccentric to the left in the figure. A bearing housing 29 is fitted and attached to the inner peripheral portion of the iron core 24. The bearing housing 29 is fitted and attached to the housing fitting hole 22 of the PC plate 21, whereby the stator 23 is attached. It is attached to the PC plate 21 via a bearing housing 29.
[0012]
In the bearing housing 29, a slide bearing 30 and a slide bearing 31 are accommodated and held up and down. Of these, the slide bearing 30 is a radial bearing and is cylindrical, and the slide bearing 31 is a thrust bearing and is a disc. Both are made of bearing metal.
[0013]
Thus, the rotary shaft 32 as a rotating body is inserted into the slide bearing 30 until the lower end of the rotary shaft 32 comes into contact with the slide bearing 31 and is rotatably supported. A yoke 34 of the rotor 33 is attached to the upper end portion of the rotating shaft 32. The rotor 33 is composed of a yoke 34 and a magnet 35 attached to the inner peripheral surface of the periphery of the yoke 34, and the inner peripheral portion of the magnet 35 is used as the outer peripheral portion (saliency pole) of the iron core 24 of the stator 23. 27 in the radial direction. That is, the rotating electrical machine of the present embodiment has an outer rotor shape in which the rotor 33 is positioned outside the stator 23.
[0014]
Here, as described above, the inner peripheral portion (hole 28) of the iron core 24 is formed to be eccentric to the left side in the drawing with respect to the outer peripheral portion (each tip surface of the salient pole 27) of the iron core 24. On the other hand, the rotating shaft 32 supported as described above is concentric with the inner peripheral portion (hole 28) of the iron core 24, and the rotor 33 attached thereto is concentric with the rotating shaft 32 and the inner peripheral portion (hole) of the iron core 24. 28) is also concentric. As a result, the outer peripheral portion of the iron core 24 of the stator 23 is decentered to the right side in the figure with respect to the rotation center of the rotor 33, thereby increasing the facing distance between the iron core 24 of the stator 23 and the magnet 35 of the rotor 33. As shown by the difference between the gap G1 on the right side in the figure and the gap G2 on the left side in the figure, it is narrow on one side (right side in the figure) and wide on the other side (left side in the figure).
[0015]
Next, the operation of the above configuration will be described.
On one side where the magnet 35 of the rotor 33 narrows the radial facing distance from the iron core 24 of the stator 23, a stronger attractive force than the other parts reaches the iron core 24 of the stator 23. As a result, the magnet 35 approaches the iron core 24, and the rotor 33 is moved to the other side in the radial direction along with the rotation shaft 32. Therefore, even when the rotor 33 is rotated by the rotational driving force generated by the magnetic circuit formed between the magnet 35 and the iron core 24, the rotor 33 is always on the other side in the radial direction with the rotating shaft 32. Rotates in a tidy state. Since the rotation of the rotor 33 is in the radial direction as described above and is performed in parallel with the axial direction, the rotating shaft 32 (rotating body) does not tilt like the conventional one.
[0016]
Therefore, since the rotating body does not make point contact with the slide bearing 30 and the surface pressure does not increase, it is possible to avoid a loss in the rotational force and to avoid a decrease in the life of the rotating body. It is done. In addition, since a magnetic material is not required specially as in the prior art, an increase in the number of parts can be avoided, the assembly can be facilitated, and the cost can be reduced.
[0017]
The inner peripheral part of the iron core 24 is a slide bearing constituent part having a slide bearing 30, and the outer peripheral part is a magnet facing part facing the magnet 35 of the rotor 33. In the above configuration, the slide bearing constituent part is In contrast to this, the magnet facing portion may be formed eccentrically with respect to the slide bearing component, but in short, they may be formed relatively eccentric. If there is, it is good.
[0018]
In contrast to this, FIG. 3 shows a first reference example of the present invention. If only the points different from the first embodiment are described, the stator core 24 of the bearing housing 41 used in place of the above-described bearing housing 29 will be described. As shown in the difference between the thickness T3 of the right side portion of the bearing housing 41 in the drawing and the thickness T4 of the left side portion of the drawing in the drawing, the outer peripheral portion 41a, which is the fitting portion, is shown in the drawing with respect to the rotation center of the rotor 33. It is in the point formed eccentrically on the right side.
[0019]
Even in this case, similarly to the first embodiment, the outer peripheral portion of the iron core 24 of the stator 23 can be eccentric to the right side in the drawing with respect to the rotation center of the rotor 33, and the iron core 24 and the rotor 33 of the stator 23 can be deviated. As shown by the difference between the gap G1 and the gap G2, the gap between the magnet 35 and the magnet 35 can be narrow on one side (right side in the figure) and wide on the other side (left side in the figure). The same effects as the first embodiment can be obtained.
[0020]
FIG. 4 shows a second embodiment of the present invention. If only the points different from the first embodiment are described, the outer peripheral portion 51a of the slide bearing 51 used in place of the above-described slide bearing 30 is replaced with the slide bearing. As apparent from the difference between the thickness T5 of the right portion 51 in the drawing and the thickness T5 of the left portion in the drawing, it is formed to be eccentric to the right side in the drawing with respect to the rotation center of the rotor 33.
[0021]
Even in this case, similarly to the first embodiment, the outer peripheral portion of the iron core 24 of the stator 23 can be eccentric to the right side in the figure with respect to the rotation center of the rotor 33, and the iron core 24 and the rotor of the stator 23 can be eccentric. As shown by the difference between the gap G1 and the gap G2, the distance between the 33 and the magnet 35 can be narrowed on one side (right side in the figure) and wide on the other side (left side in the figure). There can be obtained the same effect as the first embodiment.
[0022]
FIG. 5 shows a second reference example of the present invention. If only the points different from the first embodiment are described, the salient poles provided in the iron core 24 of the stator 23 instead of the salient poles 27 described above are shown. Of these, the radial length L1 of a plurality (three in the illustrated example) of salient poles 61a in one group (right side in the figure) is longer than that L2 of the other salient poles 61b.
[0023]
Even in this case, similarly to the first embodiment, the outer peripheral portion of the iron core 24 of the stator 23 can be eccentric to the right side in the figure with respect to the rotation center of the rotor 33, and the iron core 24 and the rotor of the stator 23 can be eccentric. As shown by the difference between the gap G1 and the gap G2, the distance between the 33 and the magnet 35 can be narrowed on one side (right side in the figure) and wide on the other side (left side in the figure). Thus, the same effect as in the first embodiment can be obtained.
In this case, the number of salient poles 61a of the iron core 24 of the stator 23 whose radial length is longer than that of the other salient poles 61b may be one.
[0024]
FIG. 6 shows a third reference example of the present invention. If only the points different from the first embodiment are described, this is also a protrusion provided on the iron core 24 of the stator 23 instead of the above-described salient pole 27. Of the poles, the radial length L3 of a plurality (three in the illustrated example) of salient poles 71a in one group (right side in the figure) is shorter than that L4 of the other salient poles 71b.
[0025]
By doing so, the outer peripheral portion of the iron core 24 of the stator 23 can be decentered to the left in the figure with respect to the rotation center of the rotor 33, and the iron core 24 of the stator 23 and the magnet 35 of the rotor 33 are opposed to each other. As shown by the difference between the gap G3 on the left side in the drawing and the gap G4 on the right side in the drawing, the interval can be narrowed on one side (left side in the drawing) and wide on the other side (right side in the drawing). Even in this case, the same effects as those of the first embodiment can be obtained.
In this case as well, the number of salient poles 71a of the iron core 24 of the stator 23 whose radial length is shorter than that of the other salient poles 71b may be one.
[0026]
FIG. 7 shows a fourth reference example of the present invention. If only the points different from the first embodiment are described, the iron core 24 of the stator 23 is eccentric to the right side in the figure with respect to the rotation center of the rotor 33. It is in the point of letting it install. Specifically, in this case, instead of the above-described hole 28, a hole 81 that is a mounting hole of the iron core 24 of the stator 23 is formed in a long and long shape in the left and right directions in the drawing, and the rotation center of the rotor 33 is formed. The iron core 24 of the stator 23 is eccentrically attached in the longitudinal direction of the hole 81 (right side in the figure).
[0027]
Even in this case, similarly to the first embodiment, the outer peripheral portion of the iron core 24 of the stator 23 can be eccentric to the right side in the figure with respect to the rotation center of the rotor 33, and the iron core 24 and the rotor of the stator 23 can be eccentric. As shown by the difference between the gap G1 and the gap G2, the distance between the 33 and the magnet 35 can be narrowed on one side (right side in the figure) and wide on the other side (left side in the figure). Thus, the same effect as in the first embodiment can be obtained.
[0029]
In addition, the present invention is not limited to the embodiment described above and shown in the drawings. For example, the rotary shaft 32 is changed to a fixed shaft that is attached to the support plate in a non-rotatable state. The slide bearing may be press-fitted and held, and a rotor may be fitted to the outer periphery of the slide bearing so as to be rotatably supported. In this case, the rotor that is prevented from tilting and shaking is a rotor.
[0030]
【The invention's effect】
As is clear from the above description, according to the rotating electrical machine of the present invention, the rotating body supported by the slide bearing can be prevented from tilting, and the number of parts can be increased, thereby eliminating the swinging of the rotating body. Therefore, it is possible to avoid a loss in rotational force, to avoid a decrease in the life of the rotating body, and to make assembly easier and lower costs. There is an effect.
[Brief description of the drawings]
Longitudinal sectional view showing a first embodiment of the present invention; FIG Figure 2 corresponds diagram showing a first reference example of the transverse cross-sectional view taken along the line A-A of FIG. 1 FIG. 3 present invention 4 is a diagram corresponding to FIG. 2 showing a second embodiment of the present invention. FIG. 5 is a diagram corresponding to FIG. 2 illustrating a second reference example of the present invention. FIG. 6 is a diagram corresponding to FIG. 2 illustrating a third reference example of the present invention. 7 is a view corresponding to FIG. 2 showing a fourth reference example of the present invention. FIG. 8 is a view corresponding to FIG. 1 showing a conventional example. FIG. 9 is a partially enlarged longitudinal sectional view for explaining the shake of a rotating body. FIG. 11 is a diagram corresponding to FIG. 1 showing a different conventional example. FIG. 11 is a plan view showing the arrangement of magnetic bodies.
23 is a stator, 24 is an iron core, 25 is an armature winding, 28 is a hole (slide bearing component), 30 is a slide bearing, 32 is a rotating shaft, 33 is a rotor, 35 is a magnet, G1 and G2 are gaps , 41 is a bearing housing, 41a is an outer peripheral portion of the bearing housing (a fitting portion with the stator core), 51 is a sliding bearing, 51a is an outer peripheral portion of the sliding bearing, 61a, 61b, 71a, 71b are salient poles, L1 to L4 is the length of the salient pole in the radial direction, G3 and G4 are gaps, and 81 is a long hole (an attachment hole for the stator core).

Claims

A stator having an armature winding wound around an iron core;
This is supported by the sliding bearing between the stator, in which Ru comprising a rotor having a magnet facing the core and the radial direction of the stator,
By relatively decentering the sliding bearing constituting portion of the stator core and the magnet facing portion , the facing distance between the stator core and the rotor magnet is narrowed on one side in the radial direction, and on the other side. A rotating electrical machine characterized by its widening.

A stator having an armature winding wound around an iron core;
In the outer rotor type, which is supported by a sliding bearing between the stator and a rotor having a magnet opposite to the stator iron core in the radial direction , the rotor being located outside the stator . ,
By decentering the outer periphery of the plain bearing with respect to the rotation center of the rotor, the facing distance between the stator iron core and the rotor magnet is narrowed on one side in the radial direction and widened on the other side. Rotating electric machine characterized by that.