JPH0127665B2

JPH0127665B2 -

Info

Publication number: JPH0127665B2
Application number: JP56113047A
Authority: JP
Inventors: Shinichiro Irie
Original assignee: Shibaura Engineering Works Co Ltd
Current assignee: Shibaura Mechatronics Corp
Priority date: 1981-07-21
Filing date: 1981-07-21
Publication date: 1989-05-30
Also published as: JPS5815457A

Description

[Detailed description of the invention]

本発明は、鉄心歯部の両端面に軸方向へ延出し
た磁束収束部分を有する電機子鉄心について、磁
束収束部分を鉄心と同時に積層形成する板抜き積
層方法に関する。界磁手段に永久磁石を使用した電動機等におい
ては、永久磁石の磁束を有効利用して運転効率を
高めるために、例えば回転子の永久磁石部分より
も電機子鉄心の軸方向寸法を短かくし、この短か
い分だけ軸方向に延出する別ピースの磁束収束部
分を電機子鉄心の歯部両端面に取り付け固定する
ことが行なわれている。しかしながらこの種の方法においては、磁束収
束部分の製作および電機子鉄心への取り付け固定
に多大の工数を必要とするという実用上大きな問
題を有していた。本発明はこのような事情に鑑みてなされたもの
であり、鉄心の板抜き積層工程内で磁束収束部分
も一体的に積層形成することに着目してなされた
ものである。以下に本発明を図面に示された一実施例に基づ
いて説明する。第１図は本発明により製作される電動機の電機
子鉄心の形状をわかり易く示す図であり、第２図
はその平面図である。また、第３図は電機子鉄心を構成する抜き板を
帯状の鋼板から打ち抜いて積層する工程をわかり
易く示す図であり、第４図は抜型による板抜き積
層状態を示す図である。第５図は、鉄心歯部と磁束収束部分が分るよう
に示された分割鉄心の斜視図である。第１図、第２図において、１は外周に永久磁石
を取り付けて形成される電動機の回転子であり、
２は電機子鉄心、３は電機子鉄心２の歯部４の両
端面に形成された磁束収束部分である。磁束収束部分３は、歯部４を形成する歯片８と
同じものを打抜き軸方向に積層して形成されてい
る。電機子鉄心２は三分割された分割鉄心５をそれ
ぞれ分割面で突き合わせ固定して形成されるもの
であつて、この固定手段としては溶接等の種々の
慣用技術を適宜使用することができる。また、６は巻線（図示せず）を収納するための
スロツトであり、このスロツト６の継鉄部分にマ
グネツトワイヤを巻き回すことにより巻線が施こ
される。次に電機子鉄心２の分割鉄心５をプレス順送型
により形成する板抜き積層工程を第３図、第４図
に基づいて説明する。なお、電機子鉄心２全体の積層枚数をｎ、磁束
収束部分３の積層枚数をそれぞれn₁、n₂としてお
り、帯状の鋼板２０は矢印Ｐで示される方向へ所
定の送りピツチで順次間欠的に移送される。（３−１）は第１枚目の抜き板７の加工工程を
示しており、それぞれの工程a1〜d1は下記のよ
うに作動する。（a1）；帯状鋼板２０の抜き板７となる部位に対
して、歯部４を形成する歯片８と継鉄部分を形
成する継鉄片９とを切り離すための切離線１０
を打ち抜き形成する。（b1）；帯状鋼板２０の抜き板７となる部位に対
して、歯片８および継鉄片９に積層接合のため
の抜孔１１を打ち抜き形成する。（c1）；何も加工を行なわずに次工程へ移送する。（d1）；抜型１４により帯状鋼板２０から抜き板
７を打ち抜いて下型１３内に圧入する。（３−２）は第二枚目以後であつて磁束収束部
３を形成するのに必要な所定枚数（n₁−１、n₂）
の抜き板７の加工工程を示しており、それぞれの
工程a₂〜d₂は下記のように作動する。（a₂）；（a₁）と同様の動作。（b₂）；何も加工を行なわずに次工程へ移送する。（c₂）；帯状鋼板２０の抜き板７となる部位に対
して、歯片８および継鉄片９に積層接合のため
の突起部１２を押し出し成形する。（d₂）；（d₁）と同様の動作。（３−３）は、歯片８と継鉄片９とを切り離さ
ない抜き板７を所定枚数（ｎ−n₁−n₂）加工する
工程を示しており、それぞれの工程a₃〜d₃は下記
のように作動する。（a₃）；何も加工を行なわずに次工程へ移送する。（b₃）；何も加工を行なわずに次工程へ移送する。（c₃）；（c₂）と同様の動作。（d₃）；（d₁）と同様の動作。すなわち、上記各工程においては帯状鋼板２０
をａ〜ｄの四つの工程に別けてＰ方向へ順次間欠
的に移送を行なつており、工程ａでは磁束収束部
分３を形成するために必要な所定枚数（＝n₁、
n₂）だけ逐次歯片８と継鉄片９との間を切離線１
０で切り離し、工程ｂでは第１枚目の抜き板７と
なる部位に対して接合のための抜孔１１を形成す
る。工程ｃでは第２枚目以後の全ての抜き板７とな
る部位に対して接合のための突起部１２を押し出
し成形し、工程ｄでは全ての抜き板７を抜型１４
によつて帯状鋼板２０から打ち抜いて、順次下型
１３内に圧挿入する。そして、下型１３内に圧挿入された抜き板７は
下型１３の側圧によつて支持されるため、抜型１
４で打ち抜かれた抜き板７が下型１３内に圧挿入
される毎に抜孔１１および突起部１２相互を順次
嵌合させて接合状態に積層すると共に、一枚分の
厚さ寸法ずつ順次押し下げるようにして下方への
移送がなされる。したがつて、分割鉄心５を板抜き積層するため
には、まず（３−１）の一連の工程により第一枚
目の抜き板７を打ち抜き、次に（３−２）の一連
の工程によりn₁−１枚の抜き板７を打ち抜き、次
に（３−３）の一連の工程によりｎ−n₁−n₂枚の
抜き板７を打ち抜き、次に（３−２）の一連の工
程によりn₂枚の抜き板７を打ち抜くことにより、
下型１３内には第４図に示されるように各抜き板
７が接合状態に積層され、作業の進行につれて順
次下型１３の下方に排出される。このとき、それぞれの抜き板７の接合について
は、第一枚目の抜孔１１に第二枚目の突起部１２
が嵌合され、第二枚目の突起部１２の反押し出し
側部分に第三枚目の突起部１２が嵌合され、……
…以後ｎ枚の抜き板７が突起部１２で相互に嵌合
されて接合が行なわれる。また、繰り返し作業により第ｎ枚目の抜き板７
の次に打ち抜かれる第一枚目の抜き板７には抜孔
１１が形成されるために第ｎ枚目の突起部１２の
反押し出し側に嵌合することがないので、抜き板
７を確実にｎ枚毎のブロツクに積層することがで
きる。以上の工程をわかり易く表にまとめると下記の
ようになる。 The present invention relates to an armature core having magnetic flux converging portions extending in the axial direction on both end faces of the core teeth, and to a method for laminating the armature core by laminating the magnetic flux converging portions at the same time as the core. In electric motors that use permanent magnets as field means, in order to effectively utilize the magnetic flux of the permanent magnets and increase operating efficiency, for example, the axial dimension of the armature core is made shorter than the permanent magnet portion of the rotor. A magnetic flux convergence portion of a separate piece extending in the axial direction by this short distance is attached and fixed to both end surfaces of the tooth portion of the armature core. However, this type of method has a practical problem in that it requires a large number of man-hours to manufacture the magnetic flux convergence part and to attach and fix it to the armature core. The present invention was made in view of these circumstances, and focused on the fact that the magnetic flux convergence portion is also integrally laminated during the core board lamination process. The present invention will be explained below based on an embodiment shown in the drawings. FIG. 1 is a diagram clearly showing the shape of an armature core of a motor manufactured according to the present invention, and FIG. 2 is a plan view thereof. Further, FIG. 3 is a diagram that clearly shows the process of punching and laminating punched plates constituting the armature core from strip-shaped steel plates, and FIG. 4 is a diagram showing the stacked state of punched plates using a cutting die. FIG. 5 is a perspective view of the split core showing the core teeth and the magnetic flux convergence portion. In FIGS. 1 and 2, 1 is a rotor of an electric motor formed by attaching permanent magnets to the outer periphery;
2 is an armature core, and 3 is a magnetic flux convergence portion formed on both end surfaces of the tooth portion 4 of the armature core 2. The magnetic flux convergence portion 3 is formed by punching out the same tooth pieces 8 as the teeth 8 forming the tooth portion 4 and laminating them in the axial direction. The armature core 2 is formed by abutting and fixing three split cores 5 at their respective split surfaces, and various conventional techniques such as welding can be used as appropriate for this fixing means. Further, 6 is a slot for storing a winding wire (not shown), and the winding is performed by winding a magnet wire around the yoke portion of this slot 6. Next, a blanking and laminating process for forming the divided cores 5 of the armature core 2 using a progressive press die will be described with reference to FIGS. 3 and 4. Note that the number of laminated sheets in the entire armature core 2 is n, and the number of laminated sheets in the magnetic flux convergence portion 3 is n ₁ and n ₂ , respectively. will be transferred to. (3-1) shows the processing steps for the first punched board 7, and each step a1 to d1 operates as follows. (a1); A separation line 10 for separating the tooth piece 8 forming the tooth part 4 and the yoke piece 9 forming the yoke part from the part of the strip steel plate 20 that will become the punched plate 7
Form by punching. (b1); At a portion of the strip steel plate 20 that will become the punched plate 7, a punched hole 11 for laminated bonding is formed in the tooth piece 8 and the yoke piece 9. (c1); Transfer to the next process without performing any processing. (d1); A punching plate 7 is punched out from the strip steel plate 20 using the punching die 14 and press-fitted into the lower die 13. (3-2) is the predetermined number of sheets (n ₁ -1, n ₂ ) required to form the magnetic flux convergence part 3 after the second sheet.
The processing steps for the punched plate 7 are shown, and each step a ₂ to d ₂ operates as follows. (a ₂ ); Same operation as (a ₁ ). (b ₂ ); Transfer to the next process without performing any processing. (c ₂ ); Projections 12 for laminated bonding are extruded onto the tooth pieces 8 and the yoke pieces 9 at a portion of the band-shaped steel plate 20 that will become the punched plate 7. (d ₂ ); Operation similar to (d ₁ ). (3-3) shows the process of processing a predetermined number (n-n ₁ - n ₂ ) of punched plates 7 that do not separate the tooth piece 8 and the yoke piece 9, and each process a ₃ to d ₃ is It works as follows. (a ₃ ); Transfer to the next process without performing any processing. (b ₃ ); Transfer to the next process without performing any processing. (c ₃ ); Same operation as (c ₂ ). (d ₃ ); Operation similar to (d ₁ ). That is, in each of the above steps, the strip steel plate 20
is divided into four steps a to d and sequentially and intermittently transferred in the P direction. In step a, a predetermined number of sheets (=n ₁ ,
The separation line 1 is successively separated between the tooth piece 8 and the yoke piece 9 by n ₂ ).
0, and in step b, a punching hole 11 for joining is formed in a portion that will become the first punched board 7. In step c, protrusions 12 for joining are extruded to the parts that will become all the punched plates 7 after the second sheet, and in step d, all the punched plates 7 are molded into the cutting die 14.
The belt-shaped steel plate 20 is punched out by the following steps and press-inserted into the lower mold 13 one after another. Since the punching plate 7 press-inserted into the lower die 13 is supported by the lateral pressure of the lower die 13, the cutting die 1
Each time the punched plate 7 punched out in step 4 is press-inserted into the lower die 13, the punched holes 11 and the protrusions 12 are successively fitted to each other to form a bonded state, and the punched plate 7 is successively pushed down by the thickness of one sheet. In this way, the downward transfer is performed. Therefore, in order to punch out and stack the split cores 5, first punch out the first punched board 7 through the series of steps (3-1), and then punch out the first punched board 7 through the series of steps (3-2). Punch out n ₁ -1 punched board 7, then punch out n-n ₁ -n ₂ punched boards 7 through the series of steps (3-3), and then perform the series of steps (3-2). By punching out _two punching boards 7,
Inside the lower mold 13, the punched plates 7 are stacked in a bonded state as shown in FIG. 4, and are sequentially discharged below the lower mold 13 as the work progresses. At this time, for joining the respective punched plates 7, the projections 12 of the second plate are inserted into the punched holes 11 of the first plate.
are fitted, the third protrusion 12 is fitted to the opposite side of the second protrusion 12, and...
...Thereafter, the n punched plates 7 are fitted into each other at the projections 12 and joined together. Also, due to repeated work, the nth punched board 7
Since the punching hole 11 is formed in the first punched plate 7 to be punched out next, the punched plate 7 will not fit into the opposite side of the n-th protrusion 12. It is possible to laminate every n blocks. The above steps can be summarized in an easy-to-understand table as shown below.

【表】そして、以上の工程を経て下型１３から取り出
された積層ブロツク１５に対して、側方からプツ
シヤー（図示せず）等によつて図中点線で示され
る継鉄片９の積層部分１６を剥離させることによ
り第５図に示されるような形状の分割鉄心５を形
成することができる。一方、本実施例においては、抜型１４で打ち抜
かれた抜き板７を下型１３の側圧で支持するもの
について説明したが、他の支持手段、例えば下方
から油圧機構により支持する等の慣用技術手段を
適宜使用することができるのはもちろんのことで
ある。また、工程ａ、ｂ、ｃについては、その順序を
適宜入れ替えて作業を行なうこともできる。以上説明の通り本発明によれば、板抜き積層工
程内で磁束収束部分を鉄心と一体的に積層形成す
ることができるため、工程の大幅低減が行なえ、
かつ大量生産にきわめて適合した板抜き積層方法
を得ることができる。[Table] The laminated block 15 taken out from the lower die 13 through the above steps is then laterally moved by a pusher (not shown), etc. to the laminated portion 16 of the yoke piece 9 shown by the dotted line in the figure. By peeling off the split core 5, it is possible to form a split core 5 having a shape as shown in FIG. On the other hand, in this embodiment, the punched plate 7 punched with the cutting die 14 is supported by the lateral pressure of the lower die 13, but other supporting means, such as conventional technical means such as supporting from below by a hydraulic mechanism, are described. Of course, you can use it as appropriate. Furthermore, the order of steps a, b, and c can be changed as appropriate. As explained above, according to the present invention, the magnetic flux convergence portion can be integrally laminated with the iron core during the plate lamination process, so the number of processes can be significantly reduced.
Moreover, it is possible to obtain a sheet-cutting and laminating method that is extremely suitable for mass production.

[Brief explanation of drawings]

第１図は本発明により製作される電機子鉄心を
わかり易く示す図、第２図はその平面図、第３図
は板抜き積層工程を示す図、第４図は抜型による
積層状態をわかり易く示す図である。第５図は、
鉄心歯部と磁束収束部分が分るように示された分
割鉄心の斜視図である。２……電機子鉄心、３……磁束収束部分、４…
…歯部、５……分割鉄心、７……抜き板、１０…
…切離線、１１……抜孔、１２……突起部、２０
……帯状鋼板。 Fig. 1 is an easy-to-understand diagram showing the armature core produced according to the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a diagram showing the board cutting lamination process, and Fig. 4 is a diagram clearly showing the lamination state using a cutting die. It is. Figure 5 shows
FIG. 2 is a perspective view of a split core showing core teeth and magnetic flux convergence portions; 2... Armature core, 3... Magnetic flux convergence part, 4...
...Tooth portion, 5...Segmented iron core, 7...Punched plate, 10...
...Separation line, 11...Drilling hole, 12...Protrusion, 20
...Striped steel plate.

Claims

[Scope of Claims] 1. A method for manufacturing an armature core having magnetic flux convergence portions extending in the axial direction on both end faces of the core teeth, comprising:
A method for punching and laminating armature cores using a progressive press die, which is characterized by comprising the following steps. (a) A slit-shaped separation line is formed between the tooth piece and the yoke piece at the part of the strip steel plate that will be the predetermined number of punched sheets at the beginning and end of the stack, and a slit-shaped separation line is formed at the part where the middle part will be the punched sheet. A process that does not form this separation line. (b) The process of forming a punching hole for joining in the part that will become the first punched board. (c) A process of extruding and molding protrusions for joining on the parts that will become the second and subsequent punched boards. (d) After completing the steps (a), (b), and (c) above, a step of punching out a punched plate from a strip steel plate, press-fitting it into a progressive die, and joining the punched plate by fitting the punched holes and protrusions with each other. .