JP5893396B2 - Laminated iron core - Google Patents

Laminated iron core Download PDF

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JP5893396B2
JP5893396B2 JP2011287275A JP2011287275A JP5893396B2 JP 5893396 B2 JP5893396 B2 JP 5893396B2 JP 2011287275 A JP2011287275 A JP 2011287275A JP 2011287275 A JP2011287275 A JP 2011287275A JP 5893396 B2 JP5893396 B2 JP 5893396B2
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connecting portion
laminated
core
segment
outer shape
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巌 明神
巌 明神
豊志 小田原
豊志 小田原
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Mitsui High Tech Inc
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Description

本発明は、帯状に連続した複数のセグメント鉄心片を螺旋状に巻回して積層した積層鉄心に関する。 The present invention relates to a laminated core in which a plurality of segment core pieces continuous in a strip shape are spirally wound and laminated.

積層鉄心の製造において、金属条材から環状の鉄心片を打抜き形成する際、多くのスクラップとなる部分が発生し、材料歩留りが低下する問題がある。この対策として、金属条材から帯状に連なる複数のセグメント鉄心片を打抜き形成し、螺旋状に巻回して積層することで積層鉄心を製造する方法が知られている。 In the production of a laminated core, when an annular core piece is punched out from a metal strip, a lot of scraps are generated, resulting in a problem that the material yield is lowered. As a countermeasure, there is known a method of manufacturing a laminated core by punching and forming a plurality of segment core pieces continuous in a strip shape from a metal strip, and winding and spiraling them.

その製造方法では、円弧状の複数のセグメント鉄心片を、外周側に形成された連結部を介して直線状に延在する形状に金属条材から打抜き、連結部を折り曲げながら連続した複数のセグメント鉄心片を螺旋状に巻回して積層する（例えば、特許文献１）。 In the manufacturing method, a plurality of arc-shaped segment core pieces are punched from a metal strip into a shape extending linearly via a connecting portion formed on the outer peripheral side, and a plurality of continuous segments are bent while the connecting portion is bent. An iron core piece is spirally wound and laminated (for example, Patent Document 1).

特開２０１０−１９３７１５号公報JP 2010-193715 A

しかしながら、複数のセグメント鉄心片を螺旋状に巻回して環状に配置する際に、連結部を容易に折り曲げることができるよう、連結部の形状は許容される範囲において幅狭に形成されている。この連結部を折り曲げると、局所的に応力が集中することで、連結部の破断が発生する虞がある。破断部分は積層鉄心の外形から突出し、モータの性能低下や、組立工程での作業性低下を招く。また、連結部は折り曲げにより板厚方向に膨出するので、巻回する際に積層方向に隣り合うセグメント鉄心片の連結部が重なり合うと、積層鉄心の厚みにばらつきが発生し、モータの品質に悪影響を及ぼす。 However, when the plurality of segment core pieces are spirally wound and arranged in an annular shape, the shape of the connecting portion is narrow in an allowable range so that the connecting portion can be easily bent. When the connecting portion is bent, the stress is locally concentrated, and the connecting portion may be broken. The broken part protrudes from the outer shape of the laminated iron core, resulting in a reduction in motor performance and workability in the assembly process. Also, since the connecting part bulges in the plate thickness direction by bending, if the connecting parts of segment core pieces adjacent in the stacking direction overlap when winding, the thickness of the stacked core will vary, which will affect the quality of the motor. Adversely affect.

本発明はかかる事情に鑑みてなされたものであり、連結部の破断を抑制するとともに、破断が発生した場合でも積層鉄心の外形に影響を与えず、また、積層鉄心の厚みのばらつきを抑制する積層鉄心を提供することを目的とする。 The present invention has been made in view of such circumstances, and suppresses breakage of the connecting portion, does not affect the outer shape of the laminated core even when the breakage occurs, and suppresses variation in the thickness of the laminated core. It aims at providing a laminated iron core.

前記目的に沿う請求項１の発明は、連結部を介して帯状に連なる複数のセグメント鉄心片を螺旋状に巻回して積層する積層鉄心において、
前記連結部の形状は、全体が該連結部より半径方向外側に中心を有する同心円の円弧形状になっており、前記連結部の外形ラインは前記セグメント鉄心片の外形ラインに交わる位置まで同一曲率の円弧状となって、しかも前記連結部の外形ラインが前記セグメント鉄心片の外形ラインよりも半径方向内側に配置されている。
さらに、請求項２の発明は、積層方向に隣り合う前記セグメント鉄心片の前記連結部の位置は、周方向にずれて積層されている。 The invention of claim 1 that meets the above-mentioned object is a laminated iron core in which a plurality of segment iron core pieces that are connected in a strip shape via a connecting portion are spirally wound and laminated.
The shape of the connecting portion is a concentric arc having a center radially outward from the connecting portion, and the outer shape line of the connecting portion has the same curvature up to a position where it intersects the outer shape line of the segment core piece. In addition, the outer shape line of the connecting portion is arranged radially inside the outer shape line of the segment core piece.
Furthermore, in the invention of claim 2, the positions of the connecting portions of the segment core pieces adjacent in the stacking direction are shifted and stacked in the circumferential direction.

請求項１に記載の積層鉄心は、連結部の形状全体を同心円の円弧形状とするので、局所的に応力が集中する部分がなくなる。これにより、連結部が破断することを抑制できる。また、連結部の外形ラインをセグメント鉄心片の外形ラインよりも半径方向内側にするので、連結部に破断が生じた場合でも破断部が積層鉄心の外形から突出することを防止できる。 In the laminated iron core according to claim 1, since the entire shape of the connecting portion is a concentric circular arc shape, there is no portion where stress is locally concentrated. Thereby, it can suppress that a connection part fractures | ruptures. Further, since the outer shape line of the connecting portion is located radially inward from the outer shape line of the segment core piece, it is possible to prevent the broken portion from protruding from the outer shape of the laminated core even when the connecting portion is broken.

請求項２に記載の積層鉄心は、積層方向に隣り合うセグメント鉄心片の連結部の位置を周方向にずれて積層されるため、連結部同士が積層方向で重なり合うことがなく、その結果、連結部を折り曲げることにより生じる膨出部により積層鉄心の厚みにばらつきが発生することを抑制できる。 Since the laminated iron core according to claim 2 is laminated by shifting the positions of the connecting portions of the segment core pieces adjacent to each other in the laminating direction in the circumferential direction, the connecting portions do not overlap in the laminating direction. It can suppress that dispersion | variation generate | occur | produces in the thickness of a laminated iron core by the bulging part which arises by bending a part.

本発明の一実施の形態に係る回転子積層鉄心の平面図である。It is a top view of the rotor lamination | stacking iron core which concerns on one embodiment of this invention. 同回転子積層鉄心における、連結部で連結された帯状のセグメント鉄心片の一部平面図である。It is a partial top view of the strip-shaped segment core piece connected by the connection part in the same rotor lamination | stacking iron core. 同回転子積層鉄心における、セグメント鉄心片の連結部の詳細図である。It is detail drawing of the connection part of the segment core piece in the same rotor lamination | stacking iron core. 本発明の一実施の形態に係る固定子積層鉄心の平面図である。It is a top view of the stator lamination | stacking iron core which concerns on one embodiment of this invention. 同固定子積層鉄心における、連結部で連結された帯状のセグメント鉄心片の一部平面図である。It is a partial top view of the strip-shaped segment core pieces connected by the connection part in the same stator laminated core. 同固定子積層鉄心における、セグメント鉄心片の連結部の詳細図である。It is detail drawing of the connection part of the segment core piece in the stator lamination | stacking iron core.

続いて、本発明の形態について図を参照して説明し、本発明の理解に供する。
図１、図２に示すように、本発明の一実施の形態に係る積層鉄心は、外周部に形成された連結部１１を介して帯状に連なる複数のセグメント鉄心片１２を有し、連結部１１を折り曲げながら連続した複数のセグメント鉄心片１２を螺旋状に巻回して積層した回転子積層鉄心１０である。全体で２２極、即ち２２の永久磁石保持部１３を外周に有し、１つのセグメント鉄心片１２には４つの永久磁石保持部１３を有している。この永久磁石保持部１３に永久磁石を接着剤等により固定する。積層鉄心全体の永久磁石保持部１３の数が１つのセグメント鉄心片１２の永久磁石保持部１３の数の倍数でないので、巻回した場合に積層方向に隣り合うセグメント鉄心片１２の連結部１１は周方向にずれて重なり合うことはない。以下、詳しく説明する。 Subsequently, the form of the present invention will be described with reference to the drawings for understanding of the present invention.
As shown in FIG. 1 and FIG. 2, the laminated core according to the embodiment of the present invention has a plurality of segment core pieces 12 connected in a strip shape via a connecting portion 11 formed on the outer peripheral portion. 11 is a rotor laminated core 10 in which a plurality of continuous segment core pieces 12 are spirally wound and laminated while bending 11. A total of 22 poles, that is, 22 permanent magnet holding portions 13 are provided on the outer periphery, and one segment core piece 12 has four permanent magnet holding portions 13. A permanent magnet is fixed to the permanent magnet holding portion 13 with an adhesive or the like. Since the number of permanent magnet holding portions 13 of the entire laminated core is not a multiple of the number of permanent magnet holding portions 13 of one segment core piece 12 , the connecting portions 11 of the segment core pieces 12 adjacent to each other in the stacking direction when wound are There is no overlap in the circumferential direction. This will be described in detail below.

回転子積層鉄心１０は、厚みが例えば０．５ｍｍ以下程度の電磁鋼板から、連結部１１を介して帯状に連なる複数のセグメント鉄心片１２を金型で打抜き、打抜かれた連続したセグメント鉄心片１２を螺旋状に巻回して積層することで構成される。ここで、複数のセグメント鉄心片１２の積層方法としては、かしめ、溶接、及び接着のいずれか１つを適用することも、また、いずれか２つ以上を併用することもできる。本実施の形態においては、かしめ１４によるかしめ結合により積層している。 The rotor laminated core 10 is formed by punching a plurality of segment core pieces 12 connected in a strip shape from a magnetic steel sheet having a thickness of, for example, about 0.5 mm or less through a connecting portion 11 with a die, and is continuously punched. It is comprised by winding and laminating. Here, as a method for laminating the plurality of segment core pieces 12, any one of caulking, welding, and adhesion can be applied, or any two or more can be used in combination. In the present embodiment, the layers are stacked by caulking by caulking 14.

隣り合うセグメント鉄心片１２の間には、セグメント鉄心片１２を外周部で結合する連結部１１が設けられている。図３に示すように、この連結部１１の両端には、折り曲げ後に永久磁石保持部１３となる半径方向外側に突出する突出部１９が形成されており、突出部１９の先端は平坦になっている。連結部１１の折り曲げ前の半径方向の幅は幅狭に形成されている。連結部１１の形状は全体が同心円の円弧形状となっており、その中心１８は半径方向外側に設定されている。同心円の円弧形状にすることにより、折り曲げ時に連結部１１に発生する応力が局所的に集中することなく、連結部１１全体に分散されることにより、連結部１１の破断を抑制することができる。 Between the adjacent segment core pieces 12, the connection part 11 which couple | bonds the segment core pieces 12 with an outer peripheral part is provided. As shown in FIG. 3, projecting portions 19 projecting outward in the radial direction to be the permanent magnet holding portion 13 after being bent are formed at both ends of the connecting portion 11, and the tips of the projecting portions 19 become flat. Yes. The width of the connecting portion 11 in the radial direction before being bent is formed narrow. The connecting portion 11 has a concentric circular arc shape as a whole, and its center 18 is set radially outward. By using the concentric circular arc shape, the stress generated in the connecting portion 11 during bending is not concentrated locally, but the entire connecting portion 11 is dispersed, whereby the breaking of the connecting portion 11 can be suppressed.

連結部１１の半径方向の幅はセグメント鉄心片１２の板厚の１〜３倍に設定されており、この範囲を下回ると連結部１１の剛性が落ちて、搬送時や折り曲げ前に破断を起こし易くなる。また、この範囲を上回ると連結部１１の剛性が高くなり過ぎて折り曲げが困難になる。 The radial width of the connecting portion 11 is set to 1 to 3 times the plate thickness of the segment core piece 12, and if it falls below this range, the rigidity of the connecting portion 11 is reduced, and breakage occurs at the time of conveyance or before bending. It becomes easy. Moreover, if it exceeds this range, the rigidity of the connection part 11 will become high too much and it will become difficult to bend.

連結部１１の半径方向外側には凹状切り欠き１７が設けられている。この凹状切り欠き１７は連結部１１を折り曲げてセグメント鉄心片１２を環状に配置した場合、半径方向外側に突出する部分（半径方向膨出部）が積層鉄心の外形から突出しないようにしている。しかも、連結部１１の外形ライン１５はセグメント鉄心片１２の外形ライン１６、具体的には突出部１９の先端の平坦部から直線状に延びる仮想線Ｌよりも半径方向内側に設定されている。これにより、折り曲げ時に連結部１１に破断が発生した場合でも、破断部が積層鉄心の外形から突出して、積層鉄心の外形に影響を及ぼすことを防止する。 A concave notch 17 is provided on the radially outer side of the connecting portion 11. The concave notch 17 prevents the portion protruding radially outward (radially bulging portion) from protruding from the outer shape of the laminated core when the connecting portion 11 is bent and the segment core pieces 12 are annularly arranged. Moreover, the outer shape line 15 of the connecting portion 11 is set radially inward from the outer shape line 16 of the segment core piece 12, specifically, the imaginary line L extending linearly from the flat portion at the tip of the protruding portion 19 . Thereby, even when a rupture occurs in the connecting portion 11 during bending, the rupture portion is prevented from projecting from the outer shape of the laminated core and affecting the outer shape of the laminated core.

本実施の形態においては、積層鉄心全体の永久磁石保持部１３の数が１つのセグメント鉄心片１２の永久磁石保持部１３の数の倍数でないので、１条の帯状板（即ち、連結部１１で帯状に連結されたセグメント鉄心片１２）を螺旋状に巻回して積層鉄心を製造しても、積層方向に隣り合うセグメント鉄心片１２の連結部１１は周方向にずれて重なり合うことはないが、複数条（例えば２条）の帯状板を螺旋状に巻回して積層鉄心を製造することも可能であり、積層速度が上がることにより生産性を向上させることができる。 In the present embodiment, since the number of permanent magnet holding portions 13 of the entire laminated core is not a multiple of the number of permanent magnet holding portions 13 of one segment core piece 12, one strip-shaped plate (that is, the connecting portion 11). Even when the laminated cores are manufactured by spirally winding the segment core pieces 12) connected in a strip shape, the connecting portions 11 of the segment core pieces 12 adjacent to each other in the stacking direction do not overlap in the circumferential direction. It is also possible to manufacture a laminated iron core by winding a plurality of strips (for example, two strips) in a spiral shape, and productivity can be improved by increasing the lamination speed.

本実施の形態では、回転子積層鉄心の半径方向外側表面に永久磁石を備える構造のものを例に説明したが、本発明は回転子積層鉄心の内部に永久磁石を備える構造のものにも適用することができる。 In the present embodiment, the structure having a permanent magnet on the radially outer surface of the rotor laminated core has been described as an example. However, the present invention is also applied to a structure having a permanent magnet inside the rotor laminated core. can do.

また、前記実施の形態と同様に、本発明は固定子積層鉄心にも適用できる。図４、図５に示すように、環状に配置されたヨーク部２３から半径方向内側にティース部２４が突出した形状の固定子積層鉄心２０は、外周部に形成された連結部２１を介して帯状に連なる複数のセグメント鉄心片２２を、連結部２１を折り曲げながら螺旋状に巻回して積層することで構成される。本実施の形態においては、かしめ２５によるかしめ結合により積層されているが、かしめ、溶接、及び接着のいずれか１つを適用することも、また、いずれか２つ以上を併用することもできる。 In addition, similar to the above embodiment, the present invention can be applied to a stator laminated core. As shown in FIGS. 4 and 5, the stator laminated iron core 20 having a shape in which the tooth portion 24 protrudes radially inward from the annularly arranged yoke portion 23 is connected via a connecting portion 21 formed on the outer peripheral portion. A plurality of segment core pieces 22 that are continuous in a band shape are wound and laminated in a spiral manner while bending the connecting portion 21. In the present embodiment, the layers are laminated by caulking and bonding by caulking 25, but any one of caulking, welding, and adhesion can be applied, or any two or more can be used in combination.

図６に示すように、連結部２１の形状は全体が同心円の円弧形状となっており、その中心は半径方向外側に設定されている。連結部２１の外形ラインはセグメント鉄心片２２の外形ラインよりも半径方向内側に設定されている。連結部２１の形状は全体が同心円の円弧形状となっており、その中心２９は半径方向外側に設定されている。同心円の円弧形状にすることにより、折り曲げ時に連結部２１に発生する応力が局所的に集中することなく、連結部２１全体に分散されることにより、連結部２１の破断を抑制することができる。 As shown in FIG. 6, the connecting portion 21 has a concentric circular arc shape as a whole, and its center is set on the outer side in the radial direction. The outer shape line of the connecting portion 21 is set radially inward from the outer shape line of the segment core piece 22. The connecting portion 21 has a concentric circular arc shape as a whole, and its center 29 is set radially outward. By using the concentric circular arc shape, the stress generated in the connecting portion 21 at the time of bending is not concentrated locally, but the entire connecting portion 21 is dispersed, whereby the breakage of the connecting portion 21 can be suppressed.

連結部２１の半径方向外側には凹状切り欠き２６が設けられている。この凹状切り欠き２６は連結部２１を折り曲げてセグメント鉄心片２２を環状に配置した場合、半径方向外側に突出する部分（半径方向膨出部）が積層鉄心の外形から突出しないようにしている。しかも、連結部２１の外形ライン２７はセグメント鉄心片２２の外形ライン２８、具体的にはセグメント鉄心片２２の外形から直線状に延びる仮想線Ｍよりも半径方向内側に設定されている。これにより、折り曲げ時に連結部２１に破断が発生した場合でも、破断部が積層鉄心の外形から突出して、積層鉄心の外形に影響を及ぼすことを防止する。 A concave notch 26 is provided on the radially outer side of the connecting portion 21. When the connecting portion 21 is bent and the segment core pieces 22 are arranged in an annular shape, the concave notch 26 prevents the portion protruding radially outward (radially bulging portion) from protruding from the outer shape of the laminated core. Moreover, the outer shape line 27 of the connecting portion 21 is set radially inward from the outer shape line 28 of the segment core piece 22, specifically, the virtual line M extending linearly from the outer shape of the segment core piece 22. Thereby, even when a rupture occurs in the connecting portion 21 at the time of bending, the rupture portion is prevented from projecting from the outer shape of the laminated core and affecting the outer shape of the laminated core.

本実施の形態においては、積層鉄心全体のティース部２４の数が１つのセグメント鉄心片２２当たりのティース部２４の数の倍数となっているため、１条の帯状板（即ち、連結部２１で帯状に連結されたセグメント鉄心片２２）を螺旋状に巻回して積層鉄心を製造すると、積層方向に隣り合うセグメント鉄心片２２の連結部が重なり合うことになる。しかし、複数条（例えば２条）の帯状板を螺旋状に巻回して積層鉄心を製造することで、積層鉄心の厚みにばらつきが発生することを回避できる。 In the present embodiment, since the number of the tooth portions 24 of the entire laminated core is a multiple of the number of the tooth portions 24 per one segment core piece 22, one strip-shaped plate (that is, the connecting portion 21). When the laminated cores are manufactured by spirally winding the segment core pieces 22) connected in a strip shape, the connecting portions of the segment core pieces 22 adjacent in the stacking direction overlap each other. However, by producing a laminated core by spirally winding a plurality of strips (for example, two strips), it is possible to avoid variations in the thickness of the laminated core.

本発明で提示した実施の形態においては、１条の帯状板又は複数条の帯状板を螺旋状に巻回して積層鉄心を製造したが、帯状に連結されたセグメント鉄心片１２、２２を積層鉄心１層分の長さに切断し、巻回して１層ずつ積層していくという方法も可能である。 In the embodiment presented in the present invention, a laminated core is manufactured by spirally winding a single strip or a plurality of strips. However, the segment core pieces 12 and 22 connected in a strip form are stacked. It is also possible to cut into a length corresponding to one layer, wind and laminate one layer at a time.

本発明は前記実施の形態に限定されず、特許請求の範囲に記載されている事項の範囲内で考えられるその他の実施の形態や変形例も含むものである。 The present invention is not limited to the above-described embodiments, and includes other embodiments and modifications that can be considered within the scope of the matters described in the claims.

１０：回転子積層鉄心、１１：連結部、１２：セグメント鉄心片、１３：永久磁石保持部、１４：かしめ、１５：連結部の外形ライン、１６：セグメント鉄心片の外形ライン、１７：凹状切り欠き、１８：同心円中心、１９：突出部、２０：固定子積層鉄心、２１：連結部、２２：セグメント鉄心片、２３：ヨーク部、２４：ティース部、２５：かしめ、２６：凹条切り欠き、２７：連結部の外形ライン、２８：セグメント鉄心片の外形ライン、２９：同心円中心、Ｌ、Ｍ：仮想線 10: Rotor laminated core, 11: connecting portion, 12: segment core piece, 13: permanent magnet holding portion, 14: caulking, 15: outer shape line of connecting portion, 16: outer shape line of segment core piece, 17: concave cut Notch, 18: Center of concentric circle, 19: Protruding part, 20: Stator laminated core, 21: Connection part, 22: Segment core piece, 23: Yoke part, 24: Teeth part, 25: Caulking, 26: Concave notch 27: Outline line of connecting part, 28: Outline line of segment core piece, 29: Concentric circle center, L, M: Virtual line

Claims (2)

連結部を介して帯状に連なる複数のセグメント鉄心片を螺旋状に巻回して積層する積層鉄心において、
前記連結部の形状は、全体が該連結部より半径方向外側に中心を有する同心円の円弧形状になっており、前記連結部の外形ラインは前記セグメント鉄心片の外形ラインに交わる位置まで同一曲率の円弧状となって、しかも前記連結部の外形ラインが前記セグメント鉄心片の外形ラインよりも半径方向内側に配置されていることを特徴とする積層鉄心。 In a laminated iron core in which a plurality of segment iron core pieces connected in a strip shape via a connecting portion are spirally wound and laminated,
The shape of the connecting portion is a concentric arc having a center radially outward from the connecting portion, and the outer shape line of the connecting portion has the same curvature up to a position where it intersects the outer shape line of the segment core piece. A laminated iron core having an arc shape and having an outer shape line of the connecting portion disposed radially inward of an outer shape line of the segment core piece. 請求項１記載の積層鉄心において、積層方向に隣り合う前記セグメント鉄心片の前記連結部の位置は、周方向にずれて積層されていることを特徴とする積層鉄心。 2. The laminated core according to claim 1, wherein the positions of the connecting portions of the segment core pieces adjacent to each other in the lamination direction are shifted in the circumferential direction.
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