JPH09327137A - Fixed magnetic-pole core for motor - Google Patents
Fixed magnetic-pole core for motorInfo
- Publication number
- JPH09327137A JPH09327137A JP8145629A JP14562996A JPH09327137A JP H09327137 A JPH09327137 A JP H09327137A JP 8145629 A JP8145629 A JP 8145629A JP 14562996 A JP14562996 A JP 14562996A JP H09327137 A JPH09327137 A JP H09327137A
- Authority
- JP
- Japan
- Prior art keywords
- iron core
- winding
- distance
- peripheral surface
- inner peripheral
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電動機の技術分野
に属し、特に電動機の設計技術および製造技術の技術分
野に属する。なお、本発明は、発電機をも含む回転電機
一般にも適用可能である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of electric motors, and more particularly to the technical field of designing and manufacturing technology of electric motors. The present invention is also applicable to general rotary electric machines including a generator.
【０００２】[0002]
【従来の技術】従来技術による電動機の固定子におい
て、図７に示すように、鉄芯１Ｃはヨーク４に保持され
ており、鉄芯１Ｃのボス部１０の周囲には巻線２が配設
されている。すなわち、鉄芯１Ｃは、巻線２とともに固
定磁極１００Ｃを形成している。鉄芯１Ｃは、ヨーク４
の内周面４１から電動機の中心軸（図略）へ向かって半
径方向に突出しているボス部１０と、ボス部１０の内端
部の周囲からヨーク４の内周面４１に略平行に張り出し
ている鍔部１１Ｃとからなる。2. Description of the Related Art In a conventional stator of an electric motor, as shown in FIG. 7, an iron core 1C is held by a yoke 4 and a winding 2 is arranged around a boss portion 10 of the iron core 1C. Has been done. That is, the iron core 1C forms the fixed magnetic pole 100C together with the winding 2. The iron core 1C is the yoke 4
The boss portion 10 protruding radially from the inner peripheral surface 41 of the electric motor toward the central axis (not shown) of the electric motor, and the boss portion 10 extending from the periphery of the inner end portion of the boss portion 10 substantially parallel to the inner peripheral surface 41 of the yoke 4. It is composed of a collar portion 11C that is open.
【０００３】従来の鉄芯１Ｃは、同図中に破線Ｂで示す
ように、巻線２が配設される以前の状態で、鉄芯１Ｃの
鍔部１１Ｃが形成している内周面は、ボス部１０に接合
している根元部分ででも先端部分ででも、中心軸からの
等距離にある。すなわち、回転子５に対向する鉄芯１Ｃ
の内周面は、ボス部１０の中央部から周方向に両側の鍔
部１１Ｃの根元部分を経て先端部分に至るまで、中心軸
から等距離に形成されている。すなわち、上記内周面の
曲率半径は一定で中心軸からの距離に等しく、同内周面
はヨーク４と同軸な円筒面の一部を形成している。In the conventional iron core 1C, as shown by a broken line B in the figure, the inner peripheral surface formed by the collar portion 11C of the iron core 1C is in a state before the winding 2 is arranged. In the root portion and the tip portion joined to the boss portion 10, they are equidistant from the central axis. That is, the iron core 1C facing the rotor 5
The inner peripheral surface of is formed equidistant from the central axis from the central portion of the boss portion 10 to the tip portion in the circumferential direction via the root portions of the collar portions 11C on both sides. That is, the radius of curvature of the inner peripheral surface is constant and equal to the distance from the central axis, and the inner peripheral surface forms a part of a cylindrical surface coaxial with the yoke 4.
【０００４】[0004]
【発明が解決しようとする課題】ところが、上記従来技
術の固定磁極鉄心を固定磁極に仕上げる際、巻線（コイ
ル）を施すと、鍔部１１Ｃに撓み変形が生じ、鍔部１１
Ｃの外縁部が中心軸側へいくらか変位していた（同図中
に矢印Ａで示す）。この撓み変形は、巻線を施す際に巻
線にかけておく巻線張力により、鍔部１１Ｃを外周側
（巻線側）から内周側（中心軸側）へ押圧する力が生じ
ることに起因している。この撓み変形は、鉄芯１Ｃとヨ
ーク４との接合後に巻線を施す手順の工程によっても、
逆にヨーク４との接合以前に鉄芯１Ｃに巻線を施してお
く手順の工程によっても生じていた。However, when the fixed magnetic pole iron core of the above-mentioned prior art is finished into a fixed magnetic pole, when a winding (coil) is applied, the flange portion 11C is flexibly deformed and the flange portion 11 is deformed.
The outer edge of C was slightly displaced toward the central axis (indicated by arrow A in the figure). This flexural deformation is caused by a force that presses the collar portion 11C from the outer peripheral side (winding side) to the inner peripheral side (central axis side) due to the winding tension applied to the winding when applying the winding. ing. This flexural deformation is also caused by the process of winding the wire after joining the iron core 1C and the yoke 4 to each other.
On the contrary, it also occurs due to the step of winding the iron core 1C before the joining with the yoke 4.
【０００５】その結果生じる上記変位（矢印Ａ）によ
り、鍔部１１Ｃの外縁部が回転子（アーマチュア）５の
外周面に接触してしまい、摩擦による出力損失や摩擦熱
が発生する恐れがあり、不都合だった。逆に、撓み変形
による鍔部１１Ｃの外縁部の変位を見込んで、当初から
十分な間隔を取って固定磁極鉄芯１Ｃを設計しておくと
いう手段はあった。しかしながらこの手段では、鍔部１
１Ｃの外縁部と回転子５との接触は避けることができた
が、ボス部１０では回転子５との間隔（エアギャップ）
が過大となり、界磁が形成する磁気回路の効果が減殺さ
れて軸出力が減少するという不都合を生じていた。あわ
せて、エアギャップを大きく取る分、ヨーク外径が１〜
２％程度増大してしまうので、小型化の要求にもマッチ
しないという不都合をも抱えていた。The resulting displacement (arrow A) may cause the outer edge of the collar 11C to contact the outer peripheral surface of the rotor (armature) 5, resulting in frictional loss of output and frictional heat. It was inconvenient. On the contrary, there has been a means of designing the fixed magnetic pole iron core 1C with sufficient spacing from the beginning in consideration of the displacement of the outer edge portion of the collar portion 11C due to the bending deformation. However, with this means, the collar portion 1
It was possible to avoid contact between the outer edge of 1C and the rotor 5, but in the boss portion 10, the gap (air gap) with the rotor 5 was formed.
Is excessively large, the effect of the magnetic circuit formed by the field is reduced, and the shaft output is reduced. In addition, the outer diameter of the yoke is 1 ~
Since it increases by about 2%, it also had the inconvenience of not meeting the demand for miniaturization.
【０００６】そして、近年の電動機の小型高出力化の要
求により、界磁コイルの巻線空間にはより多くの界磁コ
イルを巻く必要が増し、巻線の張力も増大傾向にあっ
て、巻線による鍔部１１Ｃへの押圧力も増大傾向にあ
る。また、電動機の中心軸に垂直な断面において、巻線
が固定磁極の断面積に占める断面積の割合であるスペー
スファクタも増大の傾向にある。この傾向は、巻線の厚
さ（半径方向の）に対して鍔部１１Ｃの厚さは薄くな
り、かつ、鍔部１１Ｃの形状は薄く長く（周方向に）突
き出す傾向が顕著になることを意味している。Due to the recent demand for smaller size and higher output of electric motors, it becomes necessary to wind more field coils in the winding space of the field coil, and the tension of the winding tends to increase. The pressing force of the wire on the collar portion 11C also tends to increase. In addition, the space factor, which is the ratio of the cross-sectional area of the winding to the cross-sectional area of the fixed magnetic pole in the cross section perpendicular to the central axis of the electric motor, also tends to increase. This tendency is that the thickness of the collar portion 11C becomes thinner than the thickness of the winding (in the radial direction), and the shape of the collar portion 11C becomes thin and long (in the circumferential direction), the tendency to protrude becomes remarkable. I mean.
【０００７】特に、鉄芯１Ｃのスペースファクタが６０
％以上で、鍔部１１Ｃの周方向の最大幅がボス部１０の
周方向の最大幅の１．５倍以上である場合には、前述の
不都合が顕著であり、鉄芯１Ｃと回転子５とが互いに接
触することさえある。また、スペースファクタが同じく
６０％以上で、鍔部１１Ｃの半径方向の厚さが、ボス部
１０の半径方向の厚さの３０％以下である場合にも、同
様の不都合が顕著に生じている。Particularly, the space factor of the iron core 1C is 60.
%, And the maximum width in the circumferential direction of the collar portion 11C is 1.5 times or more the maximum width in the circumferential direction of the boss portion 10, the above-mentioned inconvenience is remarkable, and the iron core 1C and the rotor 5 are And even touch each other. In addition, when the space factor is also 60% or more and the radial thickness of the collar portion 11C is 30% or less of the radial thickness of the boss portion 10, the similar inconvenience occurs remarkably. .
【０００８】そこで、本発明は上記実情に鑑み、電動機
を小型高出力としながら、固定磁極鉄芯と回転子との接
触を防止することができる電動機の固定磁極鉄芯を提供
することを解決すべき課題とする。Therefore, in view of the above situation, the present invention solves the problem of providing a fixed magnetic pole iron core of an electric motor capable of preventing the contact between the fixed magnetic pole iron core and the rotor while keeping the electric motor small and high in output. It should be an issue.
【０００９】[0009]
【課題を解決するための手段およびその作用・効果】上
記課題を解決するために、発明者らは以下の手段を発明
した。 （第１手段）本発明の第１手段は、請求項１記載の電動
機の固定磁極鉄芯である。本手段では、巻線が配設され
る以前の状態では、固定磁極の鉄芯の鍔部の根元部分で
の鉄芯内周面と中心軸（回転子の回転軸）との距離であ
る根元部距離よりも、鍔部の先端部分での鉄芯内周面と
中心軸との距離である先端部距離のほうが長い。すなわ
ち、巻線による押圧力がない状態で、鍔部の先端部分
は、鍔部の根元部分よりも中心軸からみて遠くにある。Means for Solving the Problems and Their Functions and Effects In order to solve the above problems, the inventors have invented the following means. (First Means) A first means of the present invention is a fixed magnetic pole iron core of an electric motor according to claim 1. In the present means, in the state before the winding is arranged, the root which is the distance between the inner peripheral surface of the iron core and the central axis (rotational axis of the rotor) at the root of the collar portion of the iron core of the fixed magnetic pole. The tip portion distance, which is the distance between the inner peripheral surface of the iron core and the central axis at the tip portion of the collar portion, is longer than the portion distance. That is, the tip portion of the collar portion is farther from the center axis than the root portion of the collar portion in the state where no pressing force is applied by the winding.
【００１０】かような形状の鉄芯に、所定の張力で巻線
が巻かれれば、鍔部の外周面（背面）から巻線による押
圧力が鍔部にかかり、鉄芯の鍔部は中心軸側に撓み変形
する。鍔部の撓み変形により、鍔部の先端部分付近は中
心軸方向へ変位するが、前述のように、鍔部の先端部分
は鍔部の根元部分よりも中心軸からみて遠くにあるの
で、上記変位により先端部分と根元部分との中心軸から
の距離の差は減少する。すなわち、巻線によって生じる
撓み変形に相当するだけの鉄芯内周面の変位は、予め鉄
芯の形状に見込まれており、巻線を巻いた状態で初め
て、鉄芯内周面がボス部でも鍔部でも中心軸から等距離
の円筒面をおおむね形成する。When the winding is wound around the iron core having such a shape with a predetermined tension, a pressing force by the winding is applied to the flange from the outer peripheral surface (back surface) of the flange, and the flange of the iron core is It bends and deforms toward the central axis. Due to the bending deformation of the collar portion, the vicinity of the tip portion of the collar portion is displaced in the central axis direction, but as described above, since the tip portion of the collar portion is farther from the center axis than the root portion of the collar portion, The displacement reduces the difference in the distance between the central portion and the tip portion and the root portion. That is, the displacement of the inner peripheral surface of the iron core corresponding to the bending deformation caused by the winding is expected in the shape of the iron core in advance, and the inner peripheral surface of the iron core does not have the boss portion until the winding is wound. However, the flange part also forms a cylindrical surface that is equidistant from the central axis.
【００１１】このように、本手段では、巻線による鉄芯
の曲げ変形が予め見込まれており、巻線が配設されて固
定磁極を形成した状態で初めて、回転子５に対するエア
ギャップが周方向に一様な鉄芯内周面が形成されるよう
意図されている。したがって、本手段によれば、巻線が
配設されて固定磁極を形成した状態で回転子に対する間
隙が周方向に一様な内周面を鉄芯が形成するので、鍔部
の先端部分が回転子５と接触することは防止されてい
る。さらに、鉄芯内周面が中心軸からほぼ等距離に形成
され、回転子に対する間隙が周方向に関して一様性が高
いので、回転子との間隙を一様に狭く設定することがで
き、電動機の小型高出力化に貢献するという効果があ
る。すなわち、電動機を小型高出力としながら、固定磁
極鉄芯と回転子との接触を防止することができるという
効果がある。As described above, according to the present means, the bending deformation of the iron core due to the winding is expected in advance, and the air gap with respect to the rotor 5 is not surrounded only when the winding is arranged and the fixed magnetic pole is formed. It is intended that a uniform inner circumferential surface of the iron core is formed. Therefore, according to this means, the iron core forms the inner peripheral surface with a uniform gap in the circumferential direction in the circumferential direction in the state where the windings are arranged and the fixed magnetic poles are formed. Contact with the rotor 5 is prevented. Further, since the inner peripheral surface of the iron core is formed substantially equidistant from the central axis and the gap with respect to the rotor is highly uniform in the circumferential direction, the gap with the rotor can be set to be uniformly narrow, and the electric motor There is an effect that it contributes to miniaturization and high output of. That is, there is an effect that it is possible to prevent the fixed magnetic pole iron core from coming into contact with the rotor while the electric motor is small and has high output.
【００１２】（第２手段）本発明の第２手段は、請求項
２記載の電動機の固定磁極鉄芯である。本手段では、根
元部距離と先端部距離との差が定量的に限定されている
ので、試作による調整を繰り返すことなく、設計段階の
当初からおおむね適正な値で上記差を設定することがで
きる。(Second Means) A second means of the present invention is a fixed magnetic pole iron core of an electric motor according to claim 2. With this means, the difference between the root portion distance and the tip portion distance is quantitatively limited, so the above difference can be set to a generally appropriate value from the beginning of the design stage without repeating adjustments by trial manufacture. .
【００１３】したがって本手段によれば、前述の第１手
段の効果に加えて、本発明による電動機の設計が容易と
なるという効果がある。 （第３手段）本発明の第３手段は、請求項３記載の電動
機の固定磁極鉄芯である。本手段では、ボス部が形成し
ている内周面の曲率半径は、同内周面と中心軸との距離
に等しく、ボス部の内周面は中心軸と同軸の円筒面の一
部を形成している。これは、ボス部は巻線工程の前後に
係わりなく同一の形状を保っており、撓み変形が実質上
ないので、当初から最適の形状に形成されていれば良い
からである。ここでいう最適の形状とは、回転子との間
に均一な間隙が形成され、しかもその間隙が十分に狭く
形成される形状のことである。それゆえ、鍔部だけが根
元部分から先端部分にかけて撓み変形が見込まれ、変形
後に最適な形状になるように形成されている。Therefore, according to this means, in addition to the effect of the above-mentioned first means, there is an effect that the electric motor according to the present invention can be easily designed. (Third Means) A third means of the present invention is a fixed magnetic pole iron core of an electric motor according to claim 3. In this means, the radius of curvature of the inner peripheral surface formed by the boss portion is equal to the distance between the inner peripheral surface and the central axis, and the inner peripheral surface of the boss portion is a part of a cylindrical surface coaxial with the central axis. Is forming. This is because the boss portion maintains the same shape regardless of before and after the winding process, and since there is substantially no bending deformation, it is sufficient that the boss portion is formed in an optimum shape from the beginning. The optimum shape here is a shape in which a uniform gap is formed between the rotor and the rotor and the gap is formed sufficiently narrow. Therefore, only the collar portion is expected to be flexibly deformed from the root portion to the tip portion, and is formed to have an optimum shape after the deformation.
【００１４】したがって本手段によれば、前述の第１手
段の効果に加えて、ボス部でも一様な回転子との間隙が
得られ、電動機の小型高出力化にいっそう貢献できると
いう効果がある。 （第４手段）本発明の第４手段は、請求項４記載の電動
機の固定磁極鉄芯である。Therefore, according to the present means, in addition to the effect of the above-mentioned first means, a uniform gap with the rotor can be obtained even at the boss portion, which further contributes to the miniaturization and high output of the electric motor. . (Fourth Means) A fourth means of the present invention is a fixed magnetic pole iron core of an electric motor according to claim 4.
【００１５】本手段では、巻線がない状態で、鍔部の根
元部分とヨーク内周面との間隔である根元部間隔より
も、鍔部の先端部分とヨーク内周面との間隔である先端
部間隔のほうが狭くなるように、鉄芯の断面形状が形成
されている。根元部間隔よりも先端部間隔のほうが狭い
のは、前述の巻線を巻く過程での撓み変形が見込まれて
いるためであり、巻線が所定の張力でボス部の周囲に巻
かれていく過程で、根元部間隔と先端部間隔との差は縮
まっていく。その結果、巻線が配設され固定磁極として
完成した状態では、根元部間隔と先端部間隔とはほぼ同
等になって一様な厚さで巻線が巻かれており、巻線の下
層（ボス部側）から上層へかけて同一の巻数で巻線が形
成され得る。With this means, the distance between the tip of the collar and the inner peripheral surface of the yoke is more than the distance between the root of the collar and the inner peripheral surface of the yoke when there is no winding. The cross-sectional shape of the iron core is formed so that the interval between the tip portions becomes narrower. The reason why the distance between the tips is narrower than the distance between the roots is that the bending deformation is expected in the winding process, and the winding is wound around the boss with a predetermined tension. In the process, the difference between the root interval and the tip interval narrows. As a result, in the state where the winding is arranged and the fixed magnetic pole is completed, the root interval and the tip interval are almost equal, and the winding is wound with a uniform thickness. The winding may be formed with the same number of turns from the boss portion side) to the upper layer.
【００１６】したがって本手段によれば、前述の第１手
段の効果に加えて、巻線が無駄なく一様に巻かれるの
で、いっそう強力な固定磁極を形成することができると
いう効果がある。 （第５手段）本発明の第５手段は、請求項５記載の電動
機の固定磁極鉄芯である。Therefore, according to this means, in addition to the effect of the above-mentioned first means, since the winding is wound uniformly without waste, there is an effect that a stronger magnetic pole can be formed. (Fifth Means) A fifth means of the present invention is a fixed magnetic pole iron core of an electric motor according to claim 5.
【００１７】本手段では、根元部間隔と先端部間隔との
差が定量的に限定されているので、試作による調整を繰
り返すことなく、設計段階の当初からおおむね適正な値
で上記差を設定することができる。したがって本手段に
よれば、前述の第１手段の効果に加えて、本発明による
電動機の設計が容易となるという効果がある。In this means, the difference between the root portion interval and the tip end interval is quantitatively limited, so the above difference is set to a generally appropriate value from the beginning of the design stage without repeating adjustments by trial manufacture. be able to. Therefore, according to this means, in addition to the effect of the above-mentioned first means, there is an effect that the electric motor according to the present invention can be easily designed.
【００１８】（第６手段）本発明の第６手段は、請求項
６記載の電動機の固定磁極鉄芯である。本手段では、ス
ペースファクタが６０％以上で、鍔部の周方向の最大幅
はボス部の周方向の最大幅の１．５倍以上である。かよ
うな断面形状を境にして前述の撓み変形が大きくなり、
従来技術の鉄芯ではしばしば鍔部の先端部分が回転子に
接触するに至ることを、発明者は数々の試作を通して知
見している。それゆえ、上記の条件に該当する鉄芯にお
いては、根元部距離よりも先端部距離が大きく、鍔部の
撓み変形による先端部分の変位が予め見込まれているこ
とが、より有効に作用する。(Sixth Means) A sixth means of the present invention is a fixed magnetic pole iron core of an electric motor according to claim 6. In this means, the space factor is 60% or more, and the maximum width of the flange portion in the circumferential direction is 1.5 times or more the maximum width of the boss portion in the circumferential direction. The above-mentioned flexural deformation increases with such a cross-sectional shape as a boundary,
The inventor has found through a number of trial productions that the tip portion of the collar portion often comes into contact with the rotor in the iron core of the conventional technique. Therefore, in the iron core satisfying the above conditions, it is more effective that the tip portion distance is larger than the root portion distance and the tip portion displacement due to the bending deformation of the collar portion is expected in advance.
【００１９】したがって本手段によれば、前述の第１手
段の効果に加えて、電動機の小型高出力化がいっそう容
易になるという効果がある。 （第７手段）本発明の第７手段は、請求項７記載の電動
機の固定磁極鉄芯である。本手段では、スペースファク
タは６０％以上であり、鍔部の半径方向の厚さがボス部
の半径方向の厚さの３０％以下である。かような断面形
状を境にして前述の撓み変形が大きくなり、従来技術の
鉄芯ではしばしば鍔部の先端部分が回転子に接触するに
至ることを、発明者は数々の試作を通して知見してい
る。それゆえ上記の条件に該当する鉄芯においては、根
元部距離よりも先端部距離が大きく、鍔部の撓み変形に
よる先端部分の変位が予め見込まれていることが、より
有効に作用する。Therefore, according to this means, in addition to the effect of the above-mentioned first means, there is an effect that it becomes easier to reduce the size and output of the electric motor. (Seventh Means) A seventh means of the present invention is a fixed magnetic pole iron core of an electric motor according to claim 7. In this means, the space factor is 60% or more, and the radial thickness of the collar portion is 30% or less of the radial thickness of the boss portion. The inventor has found through numerous trial productions that the above-described bending deformation becomes large with such a cross-sectional shape as a boundary, and in the conventional iron core, the tip portion of the collar portion often comes into contact with the rotor. There is. Therefore, in the iron core satisfying the above conditions, it is more effective that the tip portion distance is larger than the root portion distance and displacement of the tip portion due to bending deformation of the collar portion is expected in advance.
【００２０】したがって本手段によれば、前述の第１手
段の効果に加えて、電動機の小型高出力化がいっそう容
易になるという効果がある。 （第８手段）本発明の第８手段は、請求項８記載の電動
機の固定磁極鉄芯である。本手段では、そのボス部およ
び鍔部は、中心軸と平行で一定の曲率半径の鉄芯内周面
を形成しており、その曲率半径は鉄芯内周面と中心軸と
の距離より大である。すなわち、中心軸からの半径より
も大きな曲率半径で鉄芯の内周面が形成されており、し
かもその曲率半径はボス部でも両側の鍔部でも一様であ
る。それゆえ、鉄芯の内周面の形状が極めて単純であ
り、鉄芯を鋳造する場合の鋳型の加工や、鉄芯を削り出
す場合の機械加工が容易になる。Therefore, according to this means, in addition to the effect of the above-mentioned first means, there is an effect that it becomes easier to reduce the size and output of the electric motor. (Eighth Means) An eighth means of the present invention is a fixed magnetic pole iron core of an electric motor according to claim 8. In this means, the boss portion and the collar portion form an iron core inner peripheral surface parallel to the central axis and having a constant radius of curvature, and the radius of curvature is larger than the distance between the iron core inner peripheral surface and the central axis. Is. That is, the inner peripheral surface of the iron core is formed with a radius of curvature larger than the radius from the central axis, and the radius of curvature is uniform in both the boss portion and the collar portions on both sides. Therefore, the shape of the inner peripheral surface of the iron core is extremely simple, which facilitates machining of the mold for casting the iron core and machining for cutting out the iron core.
【００２１】本手段でも、鍔部の根元部距離よりも先端
部距離のほうが大きく、巻線による撓み変形の分が見込
まれて鉄芯が形成されており、巻線後に鍔部の内周面
は、中心軸からほぼ一様の距離になる。いっぽう、ボス
部の中央部分の内周面は、鍔部に連続している部分や同
部分に隣接している鍔部の根元部分に比べて、中心軸方
向へやや出っ張るが、それはほんの微小であって悪影響
はほとんどない。Also in this means, the tip end distance is larger than the root part distance of the collar portion, and the bending deformation due to the winding is expected to form the iron core, and the inner peripheral surface of the collar portion is formed after the winding. Is a substantially uniform distance from the central axis. On the other hand, the inner peripheral surface of the central part of the boss part protrudes slightly in the central axis direction compared to the part that is continuous with the collar part and the root part of the collar part that is adjacent to that part, but it is very small. There is almost no adverse effect.
【００２２】したがって本手段によれば、前述の第１手
段の効果に加えて、鉄芯を単品生産や少量生産する場合
にも、鉄芯の内周面の形状が単純で安価に加工できるの
で、比較的安価に製造することができるという効果があ
る。Therefore, according to this means, in addition to the effect of the above-mentioned first means, the shape of the inner peripheral surface of the iron core can be simply processed at low cost even when the iron core is produced individually or in small quantities. The advantage is that it can be manufactured at a relatively low cost.
【００２３】[0023]
【発明の実施の形態】本発明の電動機の固定磁極鉄芯の
実施の形態については、当業者に実施可能な理解が得ら
れるよう、以下の実施例等で明確かつ充分に説明する。
なお、以下の説明中で引用されている図面は、いずれも
中心軸（回転子の回転軸）に垂直にとった端面で描かれ
ている。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a fixed magnetic pole iron core of an electric motor according to the present invention will be described clearly and sufficiently in the following examples so that those skilled in the art can understand the invention.
It should be noted that the drawings cited in the following description are all drawn with end faces taken perpendicular to the central axis (rotational axis of the rotor).
【００２４】〔実施例１〕 （実施例１の全体構成）本発明の実施例１としての電動
機の固定磁極鉄芯（ポールコア）１は、図１に巻線（コ
イル）が配設される以前の状態で示すように、軟磁性体
からなるパイプ状のヨーク４の内周面の四方に９０°づ
つ離れた位置で抵抗溶接されている。同図中に４個ある
鉄芯１は、いずれも同一の規格で低炭素鋼の鋳造により
形成されており、寸法精度は自動車のスタータ用のもの
で百分の数ｍｍ程度である。鉄芯１は、電動機のヨーク
４に保持され、後の製造工程で図４に示すように周囲に
巻線２が配設され、巻線２とともに固定磁極１００を形
成する。[Embodiment 1] (Overall Configuration of Embodiment 1) A fixed magnetic pole iron core (pole core) 1 of an electric motor according to Embodiment 1 of the present invention is provided before winding (coil) is arranged in FIG. As shown in the above state, resistance welding is performed on the inner peripheral surface of the pipe-shaped yoke 4 made of a soft magnetic material at positions separated by 90 ° from each other. The four iron cores 1 in the figure are all formed by casting low carbon steel with the same standard, and the dimensional accuracy is about several hundredths of a mm for a starter of an automobile. The iron core 1 is held by a yoke 4 of an electric motor, and a winding 2 is arranged around the iron 2 as shown in FIG. 4 in a later manufacturing process, and forms a fixed magnetic pole 100 together with the winding 2.
【００２５】鉄芯１は、図２に示すように、ヨーク４の
内周面４１から電動機の中心軸Ｃへ向かって半径方向に
突出しているボス部１０と、ボス部１０の内端部の周囲
からヨーク内周面４１に略平行に張り出している鍔部１
１とから構成されている。ボス部１０と両側に張り出し
ている鍔部１１とは、連続する内周面（鉄芯内周面）１
０１を形成している。また、各鍔部１１は、ボス部１０
に接合している根元部分１２と、周方向に突出している
先端部分１３とを形成している。As shown in FIG. 2, the iron core 1 includes a boss portion 10 protruding radially from the inner peripheral surface 41 of the yoke 4 toward the central axis C of the electric motor, and an inner end portion of the boss portion 10. Collar portion 1 that extends from the periphery substantially parallel to the inner peripheral surface 41 of the yoke.
And 1. The inner peripheral surface (inner peripheral surface of the iron core) 1 is continuous with the boss portion 10 and the flange portion 11 projecting on both sides.
01 is formed. In addition, each collar 11 has a boss 10
A root portion 12 that is joined to and a tip portion 13 that projects in the circumferential direction are formed.
【００２６】（実施例１の内周面）鉄芯１の内周面１０
１の形状（図２参照）は、ボス部１０と両方の鍔部１１
とで異なっている。ボス部１０においては、鉄芯内周面
１０１は、回転子５（図５参照）の軸心である中心軸Ｃ
から一定の半径Ｒで規定される円筒面である。したがっ
て、ボス部１０が形成している内周面１０１の曲率半径
は、内周面１０１と中心軸Ｃとの距離Ｒに等しい。(Inner peripheral surface of Example 1) Inner peripheral surface 10 of the iron core 1
The shape of No. 1 (see FIG. 2) is the boss portion 10 and both of the collar portions 11
And are different. In the boss portion 10, the iron core inner peripheral surface 101 has a central axis C which is an axial center of the rotor 5 (see FIG. 5).
Is a cylindrical surface defined by a constant radius R. Therefore, the radius of curvature of the inner peripheral surface 101 formed by the boss portion 10 is equal to the distance R between the inner peripheral surface 101 and the central axis C.
【００２７】一方、鍔部１１では、部分によって中心軸
Ｃから鉄芯内周面１０１までの距離が異なり、先端にい
くほど距離はいくらか長くなる。すなわち、根元部距離
Ｒ２は、鍔部１１の根元部分１２での鉄芯内周面１０１
と中心軸Ｃとの距離であり、鍔部１１の先端部分１３で
の鉄芯内周面１０１と中心軸Ｃとの距離であると定義す
ると、巻線２（図４参照）が配設される以前の状態で
は、根元部距離Ｒ２よりも先端部距離Ｒ３のほうが長
い。On the other hand, in the collar portion 11, the distance from the central axis C to the iron core inner peripheral surface 101 differs depending on the portion, and the distance becomes somewhat longer toward the tip. That is, the root portion distance R2 is equal to the iron core inner peripheral surface 101 at the root portion 12 of the collar portion 11.
Is defined as the distance between the central axis C and the inner peripheral surface 101 of the iron core at the tip portion 13 of the collar portion 11, and the winding 2 (see FIG. 4) is disposed. In the state before the rotation, the tip end distance R3 is longer than the root distance R2.
【００２８】そして、根元部距離Ｒ２と先端部距離Ｒ３
との差は、巻線２が配設される以前の状態で根元部距離
Ｒ２の０．１％以上かつ５％以下であることが望まし
く、本実施例では３％である。 （実施例１の外周面）鍔部１１は、根元部分１２にボス
部１０の壁面と滑らかに連続する丸め部分が有るほか
は、根元部分から先端部分１３までほぼ一様な厚さＴ２
（図３参照）を持っている。鍔部１１は、中心軸Ｃに背
向して外周面１０２を形成しており、外周面１０２とヨ
ーク内周面４１との間には所定の間隔があって、巻線２
が配設されるべき空間が形成されている。ここで、鍔部
１１の根元部分１２とヨーク内周面４１との間隔を根元
部間隔Ｇ２とし、鍔部１１の先端部分１３とヨーク内周
面４１との間隔を先端部間隔Ｇ３とすると、巻線２が配
設される以前の状態では、根元部間隔Ｇ２よりも先端部
間隔Ｇ３のほうが狭い。The root distance R2 and the tip distance R3
The difference between and is preferably 0.1% or more and 5% or less of the root distance R2 in the state before the winding 2 is arranged, and is 3% in the present embodiment. (Outer peripheral surface of Example 1) The collar portion 11 has a substantially uniform thickness T2 from the root portion to the tip portion 13 except that the root portion 12 has a rounded portion that is smoothly continuous with the wall surface of the boss portion 10.
(See Figure 3). The collar portion 11 forms an outer peripheral surface 102 facing the central axis C, and there is a predetermined gap between the outer peripheral surface 102 and the yoke inner peripheral surface 41, and the winding 2
A space in which is to be arranged is formed. Here, when the distance between the root portion 12 of the collar portion 11 and the yoke inner peripheral surface 41 is the root portion distance G2, and the distance between the tip portion 13 of the collar portion 11 and the yoke inner peripheral surface 41 is the tip portion distance G3, In the state before the winding 2 is arranged, the tip end gap G3 is narrower than the root gap G2.
【００２９】そして、根元部間隔Ｇ２と先端部間隔Ｇ３
との差は、巻線２が配設される以前の状態で根元部間隔
Ｇ２の１％以上かつ３０％以下であることが望ましく、
本実施例では２５％である。 （実施例１の断面形状の寸法比率）鉄芯１の断面におい
て、図３に示すように、鍔部１１の周方向の最大幅Ｗ２
は、ボス部１０の周方向の最大幅Ｗ１の１．９倍であ
り、１．５倍以上ある。また、鍔部１１の半径方向の厚
さＴ２は、ボス部１０の半径方向の厚さＴ１の２３％で
あり、３０％以下である。なお、鉄芯１の形状は、中心
線ＣＬを挟んで対称である。Then, the root interval G2 and the tip interval G3.
Is preferably 1% or more and 30% or less of the root interval G2 before the winding 2 is arranged,
In this embodiment, it is 25%. (Dimensional Ratio of Sectional Shape of Example 1) In the cross section of the iron core 1, as shown in FIG. 3, the maximum width W2 of the collar portion 11 in the circumferential direction is shown.
Is 1.9 times the maximum width W1 of the boss portion 10 in the circumferential direction, which is 1.5 times or more. Further, the radial thickness T2 of the collar portion 11 is 23% of the radial thickness T1 of the boss portion 10 and is 30% or less. The shape of the iron core 1 is symmetrical with the center line CL sandwiched.
【００３０】（実施例１のスペースファクタ）ここで、
巻線２が固定磁極１００の断面積に占める割合として、
スペースファクタＦを導入する。すなわち、図４に示す
ように、スペースファクタＦは、電動機の中心軸Ｃに垂
直な断面において規定される。先ず、巻線２が配設され
ている状態で、中心軸Ｃと鉄芯１の中心線とを結んだ線
と平行に鉄芯１の鍔部１１の外縁から引いた線である外
縁線ＥＬと、ヨーク内周面４１と鉄芯１とで囲まれた空
間の断面積（鉄芯１やヨーク４の絶縁皮膜等を除外した
断面積）をＳ１とする。次に、断面積Ｓ１の同空間に巻
線される絶縁被覆を含む界磁コイル巻線２の線断面積を
Ｓ２とする。すると、互いに隣り合う巻線の導線の間に
はいくらか空間が生じ、完全に密に巻線されるわけでは
ないので、線断面積Ｓ２は空間断面積Ｓ１よりも小さく
なり、スペースファクタＦは次の数式で定義される。(Space Factor of Embodiment 1) Here,
As a ratio of the winding 2 to the cross-sectional area of the fixed magnetic pole 100,
Introduce space factor F. That is, as shown in FIG. 4, the space factor F is defined in a cross section perpendicular to the central axis C of the electric motor. First, the outer edge line EL, which is a line drawn from the outer edge of the collar portion 11 of the iron core 1 in parallel with the line connecting the central axis C and the center line of the iron core 1 in the state where the winding wire 2 is arranged. And the cross-sectional area of the space surrounded by the yoke inner peripheral surface 41 and the iron core 1 (cross-sectional area excluding the iron core 1 and the insulating coating of the yoke 4) is S1. Next, let S2 be the line cross-sectional area of the field coil winding 2 including an insulating coating wound in the same space having the cross-sectional area S1. Then, some space is created between the conductors of the windings adjacent to each other, and the windings are not completely densely wound. Therefore, the line cross-sectional area S2 becomes smaller than the space cross-sectional area S1, and the space factor F becomes Is defined by the formula.
【００３１】Ｆ ＝ （Ｓ２／Ｓ１）×１００％ 最近の小型高出力化した電動機では、巻線２がより密に
巻かれる傾向にあり、スペースファクタＦが６０％以上
であるものが少なくない。 （実施例１の作用効果）実施例１としての鉄芯１は以上
の構成および形状を持っており、いかに説明するいくつ
かの作用効果を有する。F = (S2 / S1) × 100% In recent compact and high-powered motors, the winding 2 tends to be wound more densely, and the space factor F is often 60% or more. (Effects of First Embodiment) The iron core 1 as the first embodiment has the above-described configuration and shape, and has some effects described below.
【００３２】第１に、鉄芯１に巻線２が配設される以前
の状態（図２参照）では、根元部距離Ｒ２よりも先端部
距離Ｒ３のほうが所定の長さだけ長い。すなわち、巻線
２による押圧力がない状態では、図５に破線Ｂで示すよ
うに、鍔部１１の先端部分１３は、鍔部１１の根元部分
１２よりも中心軸Ｃからみて遠くにある。かような形状
の鉄芯１に所定の巻線張力で巻線２が巻かれれば、同じ
く図５に示すように、鍔部１１の外周面（背面）１０２
から巻線２による押圧力が鍔部１１にかかり、鍔部１１
は中心軸Ｃ側に撓み変形（図中矢印Ａ）を生じる。鍔部
１１の撓み変形により、鍔部１１の先端部分１３付近は
中心軸Ｃ方向への変位Ａを生じる。その際、図５中に破
線Ｂで示すように、鍔部１１の先端部分１３は鍔部１１
の根元部分１２よりも中心軸Ｃからみて遠くにあるの
で、変位Ａにより先端部分１３と根元部分１２との中心
軸Ｃからの距離の差は減少し、中心軸Ｃからほぼ等距離
となる。すなわち、巻線２によって生じる撓み変形に相
当するだけの鉄芯１の内周面１０１（図２参照）の変位
Ａは、予め鉄芯１の製造時の形状に見込まれており、巻
線２を巻いた状態で初めて、鉄芯内周面１０１がボス部
１０でも鍔部１１でも中心軸Ｃから等距離の円筒面を形
成する。First, in the state before the winding 2 is arranged on the iron core 1 (see FIG. 2), the tip end distance R3 is longer than the root distance R2 by a predetermined length. That is, when there is no pressing force by the winding wire 2, as shown by a broken line B in FIG. 5, the tip portion 13 of the collar portion 11 is farther from the central axis C than the root portion 12 of the collar portion 11. When the winding 2 is wound around the iron core 1 having such a shape with a predetermined winding tension, as shown in FIG. 5, the outer peripheral surface (back surface) 102 of the collar 11 is also shown.
The pressing force of the winding wire 2 is applied to the collar portion 11 and the collar portion 11
Causes bending deformation (arrow A in the figure) on the side of the central axis C. Due to the bending deformation of the collar portion 11, a displacement A in the direction of the central axis C occurs near the tip portion 13 of the collar portion 11. At that time, as shown by a broken line B in FIG.
Since it is located farther from the center axis C than the root portion 12, the difference in the distance between the tip portion 13 and the root portion 12 from the center axis C is reduced by the displacement A, and the distance becomes substantially equal from the center axis C. That is, the displacement A of the inner peripheral surface 101 (see FIG. 2) of the iron core 1 corresponding to the bending deformation caused by the winding 2 is estimated in advance in the shape of the iron core 1 at the time of manufacturing, Only when the core is wound, the inner peripheral surface 101 of the iron core forms a cylindrical surface equidistant from the central axis C in both the boss portion 10 and the flange portion 11.
【００３３】このように、本実施例の鉄芯１では、巻線
２による鉄芯１の曲げ変形が予め見込まれている。すな
わち、鉄芯１は、巻線２がボス部１０の周囲に配設され
て固定磁極１００を形成した状態で、初めて回転子５に
対する空隙（エアギャップ）ｇ（図５参照）が周方向に
一様な鉄芯内周面１０１が形成されるように断面形状が
形成されている。As described above, in the iron core 1 of this embodiment, bending deformation of the iron core 1 due to the winding 2 is expected in advance. That is, in the iron core 1, a gap (air gap) g (see FIG. 5) with respect to the rotor 5 is first provided in the circumferential direction when the winding 2 is arranged around the boss portion 10 to form the fixed magnetic pole 100. The cross-sectional shape is formed so that a uniform iron core inner peripheral surface 101 is formed.
【００３４】したがって、鉄芯１に巻線２が配設されて
固定磁極１００が形成されている状態で、回転子５に対
する間隙ｇが周方向に一様になる内周面１０１が形成さ
れるので、鍔部１１の先端部分１３が回転子５と接触す
ることは防止されている。さらに、鉄芯内周面１０１が
中心軸Ｃからほぼ等距離に形成され、回転子５に対する
空隙ｇが周方向に関して一様性が高いので、回転子５と
の空隙ｇを一様に狭く設定することができ、電動機の小
型高出力化に貢献できるという効果がある。すなわち、
電動機を小型高出力としながら、固定磁極鉄芯１と回転
子５との接触を防止することができるという効果があ
る。Therefore, in the state where the winding 2 is arranged on the iron core 1 and the fixed magnetic pole 100 is formed, the inner peripheral surface 101 where the gap g with respect to the rotor 5 is uniform in the circumferential direction is formed. Therefore, the tip portion 13 of the collar portion 11 is prevented from coming into contact with the rotor 5. Further, since the iron core inner peripheral surface 101 is formed substantially equidistant from the central axis C, and the gap g with respect to the rotor 5 is highly uniform in the circumferential direction, the gap g with the rotor 5 is set to be uniformly narrow. Therefore, there is an effect that it can contribute to miniaturization and high output of the electric motor. That is,
There is an effect that the fixed magnetic pole iron core 1 and the rotor 5 can be prevented from coming into contact with each other while the electric motor is small in size and high in output.
【００３５】第２に、本実施例の鉄芯１では、根元部距
離Ｒ２と先端部距離Ｒ３との差が３％であり、適正な範
囲（０．１％〜５％）に収まっている。それゆえ、鉄芯
１は、試作による調整をあまり繰り返すことなく、巻線
による撓み変形を見込みをつけることができ、容易に設
計製造できるという効果がある。第３に、本実施例の鉄
芯１において、ボス部１０が形成している内周面１０１
の曲率半径は、内周面１０１と中心軸Ｃとの距離Ｒ（図
２参照）に等しく、ボス部１０の内周面１０１は中心軸
Ｃと同軸の円筒面の一部を形成している。これは、ボス
部１１は巻線工程の前後に係わりなく同一の形状を保っ
ており、撓み変形が実質上ないので、当初から最適の形
状に形成されていれば良いからである。ここでいう最適
の形状とは、回転子５との間に均一な間隙ｇ（図５参
照）が形成され、しかもその間隙ｇが十分に狭く形成さ
れる形状のことである。それゆえ、鍔部１１だけに根元
部分１２から先端部分１３にかけて撓み変形が見込ま
れ、変形後に最適な形状になるように形成されている。Secondly, in the iron core 1 of this embodiment, the difference between the root distance R2 and the tip distance R3 is 3%, which is within the proper range (0.1% to 5%). . Therefore, the iron core 1 has an effect that the bending deformation due to the winding can be expected without repeating the trial adjustment, and the iron core 1 can be easily designed and manufactured. Thirdly, in the iron core 1 of this embodiment, the inner peripheral surface 101 formed by the boss portion 10 is formed.
Has a radius of curvature equal to the distance R (see FIG. 2) between the inner peripheral surface 101 and the central axis C, and the inner peripheral surface 101 of the boss portion 10 forms a part of a cylindrical surface coaxial with the central axis C. . This is because the boss portion 11 maintains the same shape irrespective of before and after the winding process, and since there is substantially no bending deformation, it is sufficient that the boss portion 11 is formed in an optimum shape from the beginning. The optimum shape here is a shape in which a uniform gap g (see FIG. 5) is formed between the rotor 5 and the gap g, and the gap g is formed sufficiently narrow. Therefore, only the collar portion 11 is expected to be flexibly deformed from the root portion 12 to the tip portion 13, and is formed to have an optimum shape after the deformation.
【００３６】したがって、本実施例の鉄芯１によれば、
ボス部１０でも一様な回転子５との間隙ｇが得られ、電
動機の小型高出力化にいっそう貢献できるという効果が
ある。第４に、本実施例の鉄芯１の断面形状のうち、外
周面１０２の形状によってヨーク内周面４１との間に形
成される間隔により、次のような作用がある。Therefore, according to the iron core 1 of this embodiment,
Even in the boss portion 10, a uniform gap g with the rotor 5 is obtained, and there is an effect that it can further contribute to miniaturization and high output of the electric motor. Fourthly, among the cross-sectional shapes of the iron core 1 of the present embodiment, there is the following effect due to the space formed between the iron core 1 and the inner peripheral surface 41 of the yoke due to the shape of the outer peripheral surface 102.
【００３７】すなわち、巻線２がない状態（図２参照）
で、鍔部１１の根元部分１２とヨーク内周面４１との間
隔である根元部間隔Ｇ２よりも、鍔部１１の先端部分１
３とヨーク内周面４１との間隔である先端部間隔Ｇ３の
ほうが狭い。根元部間隔Ｇ２よりも先端部間隔Ｇ３のほ
うが狭いのは、前述の巻線２を巻く過程での撓み変形が
見込まれているためであり、巻線２が所定の巻線張力で
ボス部１０の周囲に巻かれていく過程で、根元部間隔Ｇ
２と先端部間隔Ｇ３との差は縮まっていく。その結果、
巻線２が配設され固定磁極１００として完成した状態
（図５参照）では、根元部間隔Ｇ２と先端部間隔Ｇ３と
は同等になって一様な厚さで巻線２が巻かれており、巻
線２の下層（ボス部側）から上層へかけて同一の巻数で
巻線が形成され得る。That is, the state where there is no winding 2 (see FIG. 2)
Therefore, the tip portion 1 of the collar portion 11 is larger than the root portion distance G2, which is the distance between the root portion 12 of the collar portion 11 and the yoke inner peripheral surface 41.
3 is narrower than the tip interval G3, which is the interval between the yoke 3 and the inner peripheral surface 41 of the yoke. The reason why the tip end gap G3 is narrower than the root end gap G2 is that bending deformation is expected in the process of winding the winding wire 2 described above, and the winding wire 2 has a predetermined winding tension and the boss portion 10 has a predetermined winding tension. In the process of being wrapped around the
The difference between 2 and the gap G3 at the tip portion becomes smaller. as a result,
In the state where the winding 2 is provided and the fixed magnetic pole 100 is completed (see FIG. 5), the root interval G2 and the tip interval G3 are equal, and the winding 2 is wound with a uniform thickness. The winding can be formed with the same number of turns from the lower layer (the boss portion side) of the winding 2 to the upper layer.
【００３８】したがって、鍔部１１の外周面１０２に沿
い、巻線２が無駄なく一様にボス部１０の周囲に巻かれ
るので、いっそう強力な固定磁極１００を形成すること
ができるという効果がある。第５に、本実施例の鉄芯１
では、根元部間隔Ｇ２と先端部間隔Ｇ３との差が２５％
であり、適正な範囲（１〜３０％）に収まっている。そ
れゆえ、鉄芯１は、試作による調整をあまり繰り返すこ
となく、巻線による撓み変形を見込みをつけることがで
き、容易に設計製造できるという効果がある。Therefore, the winding 2 is uniformly wound around the boss portion 10 along the outer peripheral surface 102 of the collar portion 11 without waste, so that a stronger magnetic pole 100 can be formed. . Fifthly, the iron core 1 of this embodiment
Then, the difference between the root interval G2 and the tip interval G3 is 25%.
And is within the proper range (1 to 30%). Therefore, the iron core 1 has an effect that the bending deformation due to the winding can be expected without repeating the trial adjustment, and the iron core 1 can be easily designed and manufactured.
【００３９】第６に、本実施例の鉄芯１では、スペース
ファクタ（図４参照）が６４％で６０％以上である。ま
た、再び図３に示すように、鍔部１１の周方向の最大幅
Ｗ２は、ボス部１０の周方向の最大幅Ｗ１の１．９倍で
あり、１．５倍以上ある。さらに、鍔部１１の半径方向
の厚さＴ２は、ボス部１０の半径方向の厚さＴ１の２３
％であり、３０％以下である。Sixth, in the iron core 1 of this embodiment, the space factor (see FIG. 4) is 64%, which is 60% or more. Further, as shown in FIG. 3 again, the maximum width W2 in the circumferential direction of the collar portion 11 is 1.9 times the maximum width W1 in the circumferential direction of the boss portion 10, which is 1.5 times or more. Further, the radial thickness T2 of the collar portion 11 is 23 times the radial thickness T1 of the boss portion 10.
% And 30% or less.
【００４０】かような断面形状では前述の撓み変形が顕
著になり、従来技術の鉄芯ではしばしば鍔部の先端部分
が回転子に接触する。しかし、本実施例の鉄芯１におい
ては、根元部距離Ｒ２よりも先端部距離Ｒ３が大きく、
鍔部１１の撓み変形による先端部分１３の変位Ａ（図５
参照）が予め見込まれているので、上記接触のおそれが
ない。それゆえ、鉄芯１は変位Ａが比較的大きい断面形
状をしていても、鉄芯１の内周面１０１と回転子５との
空隙ｇは十分に狭い範囲でほぼ一様に保たれるので、電
動機の小型高出力化がいっそう容易になるという効果が
ある。With such a cross-sectional shape, the above-mentioned flexural deformation becomes remarkable, and in the iron core of the prior art, the tip portion of the collar portion often comes into contact with the rotor. However, in the iron core 1 of this embodiment, the tip end distance R3 is larger than the root distance R2,
Displacement A of the tip portion 13 due to bending deformation of the collar portion 11 (see FIG.
Since the reference) is expected in advance, there is no possibility of the above contact. Therefore, even if the iron core 1 has a cross-sectional shape with a relatively large displacement A, the gap g between the inner peripheral surface 101 of the iron core 1 and the rotor 5 is kept substantially uniform in a sufficiently narrow range. Therefore, there is an effect that it becomes easier to reduce the size and the output of the electric motor.
【００４１】（実施例１の変形態様）実施例１の固定磁
極鉄芯１の変形態様で、少量生産時の生産性を向上させ
ることができる鉄芯１’の提供が可能である。本変形態
様の鉄芯１’は、図６に示すように、内周面１０１’の
形状に特徴がある。すなわち、内周面１０１’は、その
全面にわたって一様な曲率半径ｒで形成されている。ボ
ス部１０’および鍔部’は、中心軸Ｃ（図６紙面に垂
直）と平行で一定の曲率半径ｒの内周面１０１’を形成
しており、曲率半径ｒは内周面１０１’と中心軸Ｃとの
最短距離Ｒより大である。それゆえ、曲率半径ｒの中心
Ｃ’は、中心線（対称面）ＣＬ上で中心軸Ｃよりも所定
距離だけ鉄芯１から遠方にある。(Modification of Embodiment 1) In the modification of the fixed magnetic pole iron core 1 of Embodiment 1, it is possible to provide the iron core 1'which can improve the productivity in a small quantity production. As shown in FIG. 6, the iron core 1'of this modification is characterized by the shape of the inner peripheral surface 101 '. That is, the inner peripheral surface 101 'is formed with a uniform radius of curvature r over its entire surface. The boss portion 10 'and the collar portion' form an inner peripheral surface 101 'having a constant radius of curvature r parallel to the central axis C (perpendicular to the plane of FIG. 6), and the radius of curvature r is equal to the inner peripheral surface 101'. It is larger than the shortest distance R from the central axis C. Therefore, the center C ′ of the radius of curvature r is distant from the iron core 1 by a predetermined distance from the central axis C on the center line (symmetry plane) CL.
【００４２】その他の点では、鉄芯１’は鉄芯１と同様
である。鉄芯１’では、ボス部１０’および鍔部１１’
は、中心軸Ｃと平行で一定の曲率半径ｒの鉄芯内周面１
０１’を形成しており、その曲率半径ｒは鉄芯内周面１
０１’と中心軸Ｃとの距離Ｒより大である。すなわち、
中心軸Ｃからの半径Ｒよりも大きな曲率半径ｒで鉄芯内
周面１０１’が形成されており、しかもその曲率半径ｒ
はボス部１０’でも両側の鍔部１１’でも一様である。
それゆえ、鉄芯１’の内周面１０１’の形状が極めて単
純であり、鉄芯１’を鋳造する場合の鋳型の加工や、鉄
芯１’を削り出す場合の機械加工が容易になる。In other respects, the iron core 1'is similar to the iron core 1. In the iron core 1 ', the boss portion 10' and the collar portion 11 '
Is an inner peripheral surface 1 of the iron core parallel to the central axis C and having a constant radius of curvature r.
01 ′ is formed, and its radius of curvature r is the inner surface 1 of the iron core.
It is larger than the distance R between 01 'and the central axis C. That is,
The iron core inner peripheral surface 101 'is formed with a radius of curvature r larger than the radius R from the central axis C, and the radius of curvature r
Is uniform in both the boss portion 10 'and the collar portions 11' on both sides.
Therefore, the shape of the inner peripheral surface 101 ′ of the iron core 1 ′ is extremely simple, which facilitates the machining of the mold when casting the iron core 1 ′ and the machining of the iron core 1 ′ that is machined. .
【００４３】本変形態様でも、鍔部１１’の根元部距離
Ｒ２よりも先端部距離Ｒ３のほうが大きく、巻線２によ
る撓み変形の変位Ａが見込まれて鉄芯１’が形成されて
おり、巻線後に鍔部１１’の内周面１０２’は、中心軸
Ｃからほぼ一様の距離になる。いっぽう、ボス部１０’
の中央部分の内周面１０１’は、鍔部１１’と異なり巻
線２による変形はない。それゆえ、ボス部１０’では内
周面１０１’が、鍔部１１’に連続している部分や同部
分に隣接している鍔部１１’の根元部分１２’に比べて
中心軸Ｃ方向へやや近いが、それはほんの微小であって
悪影響はほとんどない。Also in this modified mode, the tip end distance R3 is larger than the root distance R2 of the collar portion 11 ', and the displacement A of the bending deformation by the winding wire 2 is expected to form the iron core 1', After winding, the inner peripheral surface 102 ′ of the collar portion 11 ′ has a substantially uniform distance from the central axis C. On the other hand, the boss 10 '
The inner peripheral surface 101 ′ of the central portion of is not deformed by the winding wire 2 unlike the collar portion 11 ′. Therefore, in the boss portion 10 ', the inner peripheral surface 101' is closer to the central axis C direction than the portion continuous with the collar portion 11 'or the root portion 12' of the collar portion 11 'adjacent to the portion 11'. It's a little close, but it's only a tiny bit and has little adverse effect.
【００４４】したがって本変形態様の鉄芯１’によれ
ば、前述の実施例１の鉄芯１がもつ効果に加えて、鉄芯
１’を単品生産や少量生産する場合にも、鉄芯１’の内
周面１０１’の形状が単純で安価に加工できるので、比
較的安価に製造することができるという効果がある。Therefore, according to the iron core 1'of this modified embodiment, in addition to the effect of the iron core 1 of the first embodiment described above, the iron core 1'can be produced individually or in small quantities. Since the shape of the'inner peripheral surface 101 'is simple and can be processed at low cost, there is an effect that it can be manufactured at relatively low cost.
【図１】 実施例１としての鉄芯とヨークとの関係を示
す固定子の端面図FIG. 1 is an end view of a stator showing a relationship between an iron core and a yoke according to a first embodiment.
【図２】 実施例１としての鉄芯の巻線以前の断面形状
を示す端面図FIG. 2 is an end view showing a cross-sectional shape before winding of an iron core as Example 1.
【図３】 実施例１としての鉄芯の巻線以前の主要寸法
を示す端面図FIG. 3 is an end view showing main dimensions before winding of an iron core as Example 1.
【図４】 スペースファクタの定義を説明するための端
面図FIG. 4 is an end view for explaining the definition of the space factor.
【図５】 実施例１の作用効果を示す回転子および固定
子の端面図FIG. 5 is an end view of the rotor and the stator showing the operation and effect of the first embodiment.
【図６】 変形態様１としての鉄芯の巻線以前の断面形
状を示す端面図FIG. 6 is an end view showing a cross-sectional shape before winding of an iron core according to a first modification.
【図７】 従来技術による鉄芯とその不都合とを示す端
面図FIG. 7 is an end view showing a conventional iron core and its disadvantages.
１，１’：鉄芯 １０，１０’：ボス部 １１，１
１’：鍔部 １２：根元部分 １３：先端部分 １００：固定磁
極 １０１，１０１’：鉄芯内周面 １０２：鉄芯外周面 ２：巻線 ４：ヨーク ４１：ヨーク内周面 ５：回転子 ｇ：エアギャップ ｒ：曲率半径 Ａ：変位（巻線による鍔部の撓み変形） Ｂ：巻線前
の形状を示す破線 Ｃ：中心軸 Ｃ’：曲率半径の中心 ＣＬ：中心線
ＥＬ：外縁線 Ｓ１：巻線空間の断面積 Ｓ２：巻線の線断面積（中心
軸に垂直な断面で） Ｒ：中心軸からのボス部までの距離 Ｒ２：根元部距離 Ｒ３：先端部距離 Ｒ４：ヨー
ク内径（半径） Ｇ２：根元部間隔 Ｇ３：先端部間隔 Ｔ１：ボス部の厚さ Ｔ２：鍔部の厚さ Ｗ１：ボス部の最大幅 Ｗ２：鍔部の最大幅1, 1 ': Iron core 10, 10': Boss part 11, 1
1 ': Collar part 12: Root part 13: Tip part 100: Fixed magnetic pole 101, 101': Iron core inner peripheral surface 102: Iron core outer peripheral surface 2: Winding 4: Yoke 41: Yoke inner peripheral surface 5: Rotor g: Air gap r: Radius of curvature A: Displacement (bending deformation of the collar part due to winding) B: Broken line showing the shape before winding C: Central axis C ': Center of radius of curvature CL: Center line EL: Outer edge line S1: Cross-sectional area of winding space S2: Line cross-sectional area of winding (in a cross section perpendicular to the central axis) R: Distance from the central axis to the boss R2: Root distance R3: Tip distance R4: Yoke inner diameter (Radius) G2: Root interval G3: Tip interval T1: Thickness of boss T2: Thickness of flange W1: Maximum width of boss W2: Maximum width of flange
Claims (8)
配設されて該巻線とともに固定磁極を形成し、 該ヨークの内周面から該電動機の中心軸へ向かって半径
方向に突出しているボス部と、該ボス部の内端部の周囲
から該ヨークの内周面に略平行に張り出している鍔部と
からなり、該ボス部と該鍔部とで連続する内周面を形成
している鉄芯において、 該鍔部は、該ボス部に接合している根元部分と、周方向
に突出している先端部分とを形成しており、 前記巻線が配設される以前の状態では、該鍔部の該根元
部分での前記内周面と前記中心軸との距離である根元部
距離よりも、該鍔部の該先端部分での該内周面と該中心
軸との距離である先端部距離のほうが長く、 該巻線の配設以後の状態では、先端部距離は該根元部距
離と略同等となることを特徴とする電動機の固定磁極鉄
芯。Claims: 1. A magnet is held by a yoke of an electric motor, and a winding is disposed around the yoke to form a fixed magnetic pole together with the winding. The fixed magnetic pole projects from the inner peripheral surface of the yoke toward the central axis of the electric motor. A boss portion and a flange portion that extends from the periphery of the inner end portion of the boss portion substantially parallel to the inner peripheral surface of the yoke, and the inner peripheral surface that is continuous with the boss portion and the flange portion is formed. In the formed iron core, the collar portion forms a root portion that is joined to the boss portion and a tip portion that projects in the circumferential direction. In the state, a distance between the inner peripheral surface and the central axis at the tip portion of the collar portion is larger than a root portion distance that is a distance between the inner peripheral surface and the central axis at the root portion of the collar portion. The tip distance, which is the distance, is longer, and the tip distance is approximately equal to the root distance after the winding is installed. A fixed magnetic pole iron core for an electric motor.
は、前記巻線が配設される以前の状態で該根元部距離の
０．１％以上かつ５％以下である請求項１記載の電動機
の固定磁極鉄芯。2. The difference between the root distance and the tip distance is 0.1% or more and 5% or less of the root distance before the winding is arranged. Fixed magnetic pole iron core of the described motor.
率半径は、該内周面と前記中心軸との距離に等しい請求
項１記載の電動機の固定磁極鉄芯。3. The fixed magnetic pole iron core for an electric motor according to claim 1, wherein a radius of curvature of the inner peripheral surface formed by the boss portion is equal to a distance between the inner peripheral surface and the central axis.
間隔である根元部間隔よりも、 該鍔部の前記先端部分と該ヨークの該内周面との間隔で
ある先端部間隔のほうが狭い請求項１記載の電動機の固
定磁極鉄芯。4. The front end of the collar portion in a state before the winding is arranged, more than a root portion distance which is a distance between the root portion of the collar portion and the inner peripheral surface of the yoke. 2. The fixed magnetic pole iron core for an electric motor according to claim 1, wherein a distance between the tip and the inner peripheral surface of the yoke is narrower.
は、前記巻線が配設される以前の状態で該根元部間隔の
１％以上かつ３０％以下である請求項４記載の電動機の
固定磁極鉄芯。5. The difference between the root interval and the tip interval is 1% or more and 30% or less of the root interval before the winding is arranged. Fixed pole iron core for electric motor.
いて、前記巻線が配設されている状態で前記固定磁極の
断面積に占める該巻線部分の断面積の割合であるスペー
スファクタは６０％以上であり、 かつ、該鍔部の周方向の最大幅は、ボス部の周方向の最
大幅の１．５倍以上である請求項１記載の電動機の固定
磁極鉄芯。6. A space factor, which is a ratio of a cross-sectional area of the winding portion to a cross-sectional area of the fixed magnetic pole in a state where the winding is arranged, in a cross section perpendicular to the central axis of the electric motor, The fixed magnetic pole iron core of an electric motor according to claim 1, wherein the maximum width in the circumferential direction of the flange portion is 60% or more, and the maximum width in the circumferential direction of the boss portion is 1.5 times or more.
いて、前記巻線が配設されている状態で前記固定磁極の
断面積に占める該巻線部分の断面積の割合であるスペー
スファクタは６０％以上であり、 かつ、前記鍔部の半径方向の厚さが、前記ボス部の半径
方向の厚さの３０％以下である請求項１記載の電動機の
固定磁極鉄芯。7. A space factor, which is a ratio of a cross-sectional area of the winding portion to a cross-sectional area of the fixed magnetic pole in a state where the winding is arranged, in a cross section perpendicular to the central axis of the electric motor, The fixed magnetic pole iron core for an electric motor according to claim 1, wherein the radial thickness of the collar portion is 60% or more, and the radial thickness of the flange portion is 30% or less of the radial thickness of the boss portion.
と平行で一定の曲率半径の前記内周面を形成しており、
該曲率半径は該内周面と該中心軸との距離より大である
請求項１記載の電動機の固定磁極鉄芯。8. The boss portion and the collar portion form the inner peripheral surface parallel to the central axis and having a constant radius of curvature,
The fixed magnetic pole iron core of an electric motor according to claim 1, wherein the radius of curvature is larger than a distance between the inner peripheral surface and the central axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8145629A JPH09327137A (en) | 1996-06-07 | 1996-06-07 | Fixed magnetic-pole core for motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8145629A JPH09327137A (en) | 1996-06-07 | 1996-06-07 | Fixed magnetic-pole core for motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09327137A true JPH09327137A (en) | 1997-12-16 |
Family
ID=15389432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8145629A Pending JPH09327137A (en) | 1996-06-07 | 1996-06-07 | Fixed magnetic-pole core for motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09327137A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008022591A (en) * | 2006-07-10 | 2008-01-31 | Jtekt Corp | Electric motor |
| US7701107B2 (en) | 2006-09-08 | 2010-04-20 | Sanyo Electric Co., Ltd. | Motor including a teeth section and a yoke section which are formed of mutually independent configuration members |
| CN102195435A (en) * | 2011-05-12 | 2011-09-21 | 杭州赛微电机有限公司 | Single-phase brushless direct current motor |
| CN113922628A (en) * | 2021-10-13 | 2022-01-11 | 珠海格力电器股份有限公司 | Motor stator and rotor structure and motor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56118550U (en) * | 1980-02-12 | 1981-09-10 | ||
| JPH0393437A (en) * | 1989-09-06 | 1991-04-18 | Hitachi Ltd | Stator for electric machinery |
-
1996
- 1996-06-07 JP JP8145629A patent/JPH09327137A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56118550U (en) * | 1980-02-12 | 1981-09-10 | ||
| JPH0393437A (en) * | 1989-09-06 | 1991-04-18 | Hitachi Ltd | Stator for electric machinery |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008022591A (en) * | 2006-07-10 | 2008-01-31 | Jtekt Corp | Electric motor |
| US7701107B2 (en) | 2006-09-08 | 2010-04-20 | Sanyo Electric Co., Ltd. | Motor including a teeth section and a yoke section which are formed of mutually independent configuration members |
| CN102195435A (en) * | 2011-05-12 | 2011-09-21 | 杭州赛微电机有限公司 | Single-phase brushless direct current motor |
| CN113922628A (en) * | 2021-10-13 | 2022-01-11 | 珠海格力电器股份有限公司 | Motor stator and rotor structure and motor |
| CN113922628B (en) * | 2021-10-13 | 2022-12-02 | 珠海格力电器股份有限公司 | Motor stator and rotor structure and motor |
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