KR20050032817A - External-tooth type spiral stator core - Google Patents

External-tooth type spiral stator core Download PDF

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Publication number
KR20050032817A
KR20050032817A KR1020030068788A KR20030068788A KR20050032817A KR 20050032817 A KR20050032817 A KR 20050032817A KR 1020030068788 A KR1020030068788 A KR 1020030068788A KR 20030068788 A KR20030068788 A KR 20030068788A KR 20050032817 A KR20050032817 A KR 20050032817A
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KR
South Korea
Prior art keywords
stator core
external
spiral stator
yoke portion
along
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KR1020030068788A
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Korean (ko)
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KR100548447B1 (en
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이승원
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엘지전자 주식회사
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Priority to KR1020030068788A priority Critical patent/KR100548447B1/en
Priority to US10/952,895 priority patent/US7271519B2/en
Publication of KR20050032817A publication Critical patent/KR20050032817A/en
Application granted granted Critical
Publication of KR100548447B1 publication Critical patent/KR100548447B1/en
Priority to US11/889,023 priority patent/US7459826B2/en
Priority to US11/836,676 priority patent/US7728481B2/en

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12Stationary parts of the magnetic circuit
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K2213/00Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03Machines characterised by numerical values, ranges, mathematical expressions or similar information

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

An external-tooth type spiral stator core is provided to exclude a welding operation, thereby preventing a thermal transformation caused by the welding operation and reducing an installation cost while shortening a production time. A band-shaped yoke unit(31) has a long length compared to width. Plural teeth units(41) are protruded in width direction from one-sided flexible portion of the yoke unit(31), and are separately disposed in length direction with predetermined pitches. A linear core steel plate consists of projection receiving grooves(42) caved-in on one side in thickness direction of each teeth unit(41), and coupling projections protruded on other side. The linear core steel plate is laminated in spiral type, so that the coupling projections can be inserted into the projection receiving grooves(42) to be fixed thereto.

Description

외치형 스파이럴 스테이터코어{EXTERNAL-TOOTH TYPE SPIRAL STATOR CORE}External-type spiral stator core {EXTERNAL-TOOTH TYPE SPIRAL STATOR CORE}

본 발명은, 외치형 스파이럴 스테이터코어에 관한 것으로서, 보다 상세하게는, 용접작업을 배제하여 용접에 기인한 열변형을 방지할 수 있고 설비투입을 줄일 수 있으며 생산시간을 단축할 수 있도록 외치형 스파이럴 스테이터코어에 관한 것이다. The present invention relates to an external spiral spiral stator core, and more particularly, to eliminate thermal deformation due to welding by eliminating welding operations, to reduce equipment input, and to reduce production time. It relates to a stator core.

도 1은 종래의 외치형 스파이럴 스테이터코어의 적층 상태를 설명하기 위한 사시도이고, 도 2는 도 1의 외치형 스파이럴 스테이터코어의 적층 완료된 평면도이다. 이들 도면에 도시된 바와 같이, 외치형 스파이럴 스테이터코어는, 원형 고리형상의 요크부(11)와, 요크부(11)의 외측에 반경방향을 따라 돌출되고 코일이 권회될 수 있게 소정의 피치로 이격 배치되는 복수의 티스부(13)를 구비하고 있다.FIG. 1 is a perspective view for explaining a lamination state of a conventional external spiral stator core, and FIG. 2 is a plan view of a laminated external stator core of FIG. 1 completed. As shown in these figures, the external spiral stator core has a circular annular yoke portion 11 and a predetermined pitch so as to protrude radially outside the yoke portion 11 and allow the coil to be wound. A plurality of tooth portions 13 are disposed apart from each other.

외치형 스파이럴 스테이터코어는, 폭에 비해 긴 길이를 가지는 직선 띠형상의 요크부(11)와, 요크부(11)의 일측 연부에 폭방향을 따라 돌출되고 소정 간격을 두고 이격되는 복수의 티스부(13)가 일체로 형성되는 선형코어강판을 소정의 내경을 가지도록 나선형으로 적층하여 형성된다. 적층이 완료되면 도 2에 도시된 바와 같이, 적층된 원통형의 요크부(11)의 내경면을 둘레방향을 따라 등각도 간격으로 분할하여 각 개소를 용접하여 용접부(15)를 형성함으로써 각 층이 분리되지 않고 두께방향을 따라 서로 일체로 고정되도록 한다. The external spiral stator core includes a straight band-shaped yoke portion 11 having a longer length than the width, and a plurality of teeth portions projecting along one side edge of the yoke portion 11 along the width direction and spaced apart at predetermined intervals. A linear core steel sheet in which (13) is integrally formed is helically laminated so as to have a predetermined inner diameter. When the lamination is completed, as shown in Figure 2, by dividing the inner diameter surface of the laminated cylindrical yoke portion 11 at equal angle intervals along the circumferential direction by welding each location to form a welded portion (15) It is to be fixed integrally with each other along the thickness direction without being separated.

그런데, 이러한 종래의 외치형 스파이럴 스테이터코어에 있어서는, 띠형상의 요크부(11)와 티스부(13)가 일체로 형성되도록 선형코어강판을 형성하고 이 선형코어강판을 나선형으로 적층한 후 각 층이 분리되지 않고 고정될 수 있게 요크부(11)의 내경면에 복수의 용접부(15)를 형성하도록 되어 있어, 용접시 열에 의한 변형으로 치수불량이 발생될 수 있을 뿐만 아니라 용접 및 냉각을 위한 설비가 소요되고 용접 및 냉각에 많은 시간이 소요되어 생산 시간이 연장된다고 하는 문제점이 있다. By the way, in such a conventional external spiral stator core, a linear core steel sheet is formed so that the belt-shaped yoke portion 11 and the tooth portion 13 are integrally formed, and the linear core steel sheets are spirally laminated, and then each layer is formed. Since the plurality of welds 15 are formed on the inner diameter surface of the yoke portion 11 so that they can be fixed without being separated, not only dimension defects may occur due to deformation due to heat during welding, but also facilities for welding and cooling It takes a lot of time for welding and cooling takes a problem that the production time is extended.

또한, 이러한 종래의 외치형 스파이럴 스테이터코어에 있어서는, 적층시 선형의 요크부(11)를 적절히 가압하여 소정 크기의 내경을 가지는 원통형으로 소성 변형시키도록 되어 있어, 적층후의 요크부(11)의 내경에 비해 요크부(11)의 폭이 상대적으로 클 경우 소성 변형이 원활하게 이루어지지 못하게 된다고 하는 문제점이 있다.In addition, in the conventional external tooth type spiral stator core, the linear yoke portion 11 is appropriately pressed during lamination so as to plastically deform into a cylindrical shape having an inner diameter of a predetermined size, and thus the inner diameter of the yoke portion 11 after lamination. In contrast, when the width of the yoke portion 11 is relatively large, there is a problem that plastic deformation cannot be made smoothly.

따라서, 본 발명의 목적은, 용접작업을 배제하여 용접에 기인한 열변형을 방지할 수 있고 설비투입을 줄일 수 있으며 생산시간을 단축할 수 있는 외치형 스파이럴 스테이터코어를 제공하는 것이다. Accordingly, an object of the present invention is to provide an external tooth type spiral stator core that can prevent heat deformation due to welding by eliminating welding work, reduce equipment input, and shorten production time.

상기 목적은, 본 발명에 따라, 폭에 비해 긴 길이를 가지는 띠형상의 요크부와, 상기 요크부의 일측 연부에 폭방향으로 돌출되고 길이방향을 따라 소정의 피치로 이격 배치되는 복수의 티스부와, 상기 각 티스부의 두께방향을 따라 일측에서 함몰되어 타측으로 돌출되도록 형성되는 돌기수용홈 및 결합돌기를 구비한 선형코어강판을 상기 티스부가 외측으로 향하도록 나선상으로 적층하여 상기 결합돌기가 두께방향을 따라 인접된 상기 돌기수용홈에 삽입되도록 하여 서로 고정되는 것을 특징으로 하는 외치형 스파이럴 스테이터코어에 의해 달성된다.The object is, according to the present invention, a belt-shaped yoke portion having a longer length than the width, a plurality of teeth portion protruding in the width direction on one side edge of the yoke portion and spaced at a predetermined pitch along the longitudinal direction; The linear core steel plate having protrusion receiving grooves and coupling protrusions formed to be recessed from one side along the thickness direction of each tooth portion and protruding to the other side is spirally stacked so that the tooth portions are directed outwards, and the coupling protrusions have a thickness direction. It is achieved by an external tooth type spiral stator core characterized in that it is fixed to each other by being inserted into the adjacent projection receiving groove.

여기서, 상기 요크부의 폭방향을 따라 상기 티스부의 대향측 연부에는 폭방향으로 절취된 복수의 노치부가 형성되어 있는 것이 바람직하다.Here, it is preferable that a plurality of notches cut in the width direction are formed at opposite edges of the teeth portion along the width direction of the yoke portion.

상기 노치부는 상기 각 티스부 사이에 대응되게 형성되는 것이 효과적이다.The notch portion may be formed to correspond to each of the tooth portions.

상기 결합돌기는 원형단면형상 및 사각단면형상 중 어느 하나로 형성되는 것이 바람직하다.The coupling protrusion is preferably formed in any one of a circular cross-sectional shape and a rectangular cross-sectional shape.

이하, 첨부된 도면을 참조하여 본 발명에 대해 상세히 설명한다. Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

도 3은 본 발명의 일 실시예에 따른 외치형 스파이럴 스테이터코어의 평면도이고, 도 4a 및 도 4b는 각각 도 3의 결합돌기 및 돌기수용홈 영역을 도시한 사시도이고, 도 5는 도 3의 Ⅴ-Ⅴ선에 따른 단면도이다. 이들 도면에 도시된 바와 같이, 본 외치형 스파이럴 스테이터코어는, 폭에 비해 긴 길이를 가지는 띠형상의 요크부(31)와, 요크부(31)의 일측 연부에 폭방향을 따라 돌출되고 길이방향을 따라 소정의 피치로 이격배치되는 복수의 티스부(41)와, 각 티스부(41)의 두께방향을 따라 일측에는 함몰된 돌기수용홈(42)과 타측에는 돌출되는 결합돌기(43)를 구비한 선형코어강판을 나선형으로 적층하여 결합돌기(43)가 돌기수용홈(42)에 삽입되어 고정되도록 형성되어 있다.Figure 3 is a plan view of the external spiral stator core according to an embodiment of the present invention, Figures 4a and 4b is a perspective view showing the engaging projection and the projection receiving area of Figure 3, respectively, Figure 5 is V of Figure 3 Sectional view along the -V line. As shown in these figures, the outer toothed spiral stator core has a belt-shaped yoke portion 31 having a longer length than the width, and protrudes along the width direction at one edge of the yoke portion 31 in the longitudinal direction. A plurality of tooth portions 41 are spaced apart at a predetermined pitch along the projection receiving groove 42 recessed on one side along the thickness direction of each tooth portion 41 and the coupling protrusion 43 protruding on the other side thereof. The coupling core 43 is formed to be inserted into the protrusion receiving groove 42 and fixed by stacking the linear core steel plate provided in a spiral shape.

선형코어강판은 나선형으로 복수의 층으로 적층될 수 있는 길이를 가지도록 띠형상으로 형성되는 요크부(31)와, 요크부(31)의 일측 연부에 요크부(31)와 일체로 폭방향을 따라 돌출되고 길이방향을 따라 소정의 피치로 이격되게 형성된 복수의 티스부(41)를 구비하고 있다.The linear core steel sheet has a yoke portion 31 formed in a band shape so as to have a length that can be stacked in a plurality of layers in a spiral manner, and the yoke portion 31 is integrally formed with the yoke portion 31 at one edge of the yoke portion 31. It is provided with a plurality of teeth 41 protruding along and spaced apart at a predetermined pitch along the longitudinal direction.

요크부(31)에는 나선형으로 적층시 도시 않은 적층장치의 가이드핀이 삽입될 수 있도록 각 티스부(41)에 대응되게 관통된 복수의 핀공(32)이 형성되어 있으며, 요크부(31)의 폭방향을 따라 티스부(41)의 대향측 연부에는 적층시 소정 크기의 내경을 형성할 수 있도록 소성 변형이 원활하게 될 수 있도록 폭방향으로 절취된 복수의 노치부(34)가 형성되어 있다. 각 노치부(34)는 각 티스부(41) 사이에 대응되게 형성되어 있다.The yoke portion 31 is formed with a plurality of pin holes 32 penetrating corresponding to each tooth portion 41 so that the guide pin of the lamination apparatus (not shown) can be inserted when the yoke portion 31 is stacked in a spiral manner. A plurality of notches 34 cut along the width direction are formed at the opposite edges of the teeth 41 along the width direction so that plastic deformation can be smoothly formed to form an inner diameter of a predetermined size when stacked. Each notch part 34 is formed correspondingly between each tooth part 41.

한편, 각 티스부(41)에는 두께방향을 따라 일측에서 함몰되고 타측으로 돌출되게 돌기수용홈(42) 및 결합돌기(43)가 형성되어 있다. 여기서, 각 결합돌기(43)는 자속의 포화에 영향을 주지 아니하는 정도의 크기로 형성되며, 돌출 정도는 각 티스부(41)의 두께(t1)의 1/3 내지 2/3정도의 두께(t2)가 되도록 한다. On the other hand, each tooth portion 41 is formed with a projection receiving groove 42 and the engaging projection 43 to be recessed from one side in the thickness direction and protrudes to the other side. Here, each coupling protrusion 43 is formed to a size that does not affect the saturation of the magnetic flux, the degree of protrusion is 1/3 to 2/3 of the thickness t1 of each tooth portion 41 (t2).

이러한 구성에 의하여, 프레스 등의 방법으로 형성된 선형코어강판은 소정의 크기를 가지는 원주상에 배치된 복수의 가이드핀을 구비한 적층장치에 티스부(41)가 외측을 향하고 결합돌기(43)가 하측을 향하도록 배치된 상태로 공급된다. 선형코어강판의 공급방향을 따라 선단부의 요크부(31)에 형성된 핀공(32)에 동일 원주상에 배치된 가이드핀이 차례로 삽입되면 직선상의 요크부(31)는 가이드핀과의 작용으로 노치부(34)를 중심으로 호형상으로 절곡되어 소성 변형되어 적층장치의 일회전시 원형을 이루게 된다. 적층장치가 계속해서 회전하면 선형코어강판은 최하층의 상측에 차례로 적층이 되고, 이 때 각 티스부(41)의 결합돌기(43)는 각 하측의 돌기수용홈(42)에 삽입되어 티스부(41)가 두께방향으로 정렬되도록 한다. 선형코어강판의 적층이 완료되면 두께방향으로 가압하여 각 결합돌기(43)가 각 하측의 돌기수용홈(42)에 밀착 삽입되도록 하여 서로 분리가 발생되지 않도록 한다. With this configuration, the linear core steel sheet formed by a method such as a press has a tooth portion 41 facing outward and a coupling protrusion 43 on a lamination apparatus having a plurality of guide pins arranged on a circumference having a predetermined size. It is supplied in a state arranged to face downward. When the guide pins arranged on the same circumference are sequentially inserted into the pin holes 32 formed in the yoke portion 31 of the tip portion along the feeding direction of the linear core steel sheet, the linear yoke portion 31 is notched by the action of the guide pin. It is bent in an arc shape around the 34 and plastically deformed to form a circle during one rotation of the laminating apparatus. When the laminating apparatus continues to rotate, the linear core steel sheets are sequentially stacked on the uppermost layer of the lowermost layer. At this time, the engaging protrusions 43 of the respective tooth portions 41 are inserted into the lower protrusion receiving grooves 42 and the tooth portions ( 41) is aligned in the thickness direction. When the stacking of the linear core steel sheet is completed is pressed in the thickness direction so that each of the coupling projections 43 is in close contact with each of the projection receiving groove 42 of the lower side so as not to be separated from each other.

전술 및 도시한 실시예에서는, 각 결합돌기 및 돌기수용홈이 원형 단면 형상을 가지도록 구성한 경우를 예를 들어 설명하고 있지만, 사각단면형상을 가지도록 구성할 수도 있다. In the above-described and illustrated embodiments, the case in which the engaging projections and the projection receiving grooves are configured to have a circular cross-sectional shape is described as an example, but may be configured to have a rectangular cross-sectional shape.

이상 설명한 바와 같이, 본 발명에 따르면, 폭에 비해 긴 길이를 가지는 띠형상의 요크부와, 요크부의 폭방향을 따라 돌출되고 길이방향을 따라 소정의 피치로 이격되게 형성되는 복수의 티스부와, 각 티스부에 일측에서 함몰되며 타측으로 돌출되는 돌기수용홈 및 결합돌기를 구비한 선형코어강판을 나선형으로 적층하여 각 결합돌기가 두께방향을 따라 인접된 돌기수용홈에 삽입되어 서로 고정되도록 하여 용접 작업을 배제함으로써, 적층후 내경면에 복수의 개소에 용접을 실시하여 용접시 열변형에 기인한 치부 불량이 발생되고 용접 및 냉각을 위한 용접 설비 및 냉각 설비 등 설비가 많이 소요되고 용접 및 냉각에 따른 생산 시간이 연장되던 종래와는 달리, 열 변형이 발생될 염려가 없고 설비 투자를 줄일 수 있을 뿐만 아니라 생산 시간을 단축할 수 있는 외치형 스파이럴 스테이터코어가 제공된다.As described above, according to the present invention, there is provided a belt-shaped yoke portion having a length longer than the width, a plurality of teeth portions projecting along the width direction of the yoke portion and spaced apart at a predetermined pitch along the longitudinal direction, Spiral lamination of linear core steel plates with protrusion receiving grooves and coupling protrusions protruding from one side and protruding to the other side in each tooth portion, so that each coupling protrusion is inserted into adjacent protrusion receiving grooves along the thickness direction and fixed to each other. By eliminating work, welding is performed on a plurality of places on the inner diameter surface after lamination, which causes tooth defects due to heat deformation during welding, and requires a lot of equipment such as welding and cooling equipment for welding and cooling. Unlike the conventional production method, which has a prolonged production time, there is no fear of thermal deformation, and it is possible to reduce equipment investment and shorten production time. An external spiral stator core is provided.

또한, 본 발명에 따르면, 요크부에 폭방향으로 절취 형성된 복수의 노치부를 구비하도록 함으로써 적층시 소성 변형이 원활하게 이루어질 수 있는 외치형 스파이럴 스테이터코어가 제공된다. In addition, according to the present invention, by providing a plurality of notches cut in the width direction in the yoke portion, there is provided an outer tooth type spiral stator core that can be plastically deformed during lamination.

도 1은 종래의 외치형 스파이럴 스테이터코어의 적층 상태를 설명하기 위한 사시도, 1 is a perspective view for explaining a stacking state of a conventional external tooth type spiral stator core,

도 2는 도 1의 외치형 스파이럴 스테이터코어의 적층 완료된 평면도, FIG. 2 is a top plan view of the stacked spiral stator core of FIG. 1;

도 3은 본 발명의 일 실시예에 따른 외치형 스파이럴 스테이터코어의 평면도, 3 is a plan view of an external type spiral stator core according to an embodiment of the present invention;

도 4a 및 도 4b는 각각 도 3의 결합돌기 및 돌기수용홈 영역을 도시한 사시도, 4A and 4B are perspective views illustrating the engaging projection and the projection receiving region of FIG. 3, respectively;

도 5는 도 3의 Ⅴ-Ⅴ선에 따른 단면도이다.5 is a cross-sectional view taken along the line VV of FIG. 3.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

31 : 요크부 32 : 핀공31: yoke portion 32: pin ball

34 : 노치부 41 : 티스부34: notch 41: teeth

42 : 돌기수용공 43 : 결합돌기42: projection receiving ball 43: coupling projection

Claims (4)

폭에 비해 긴 길이를 가지는 띠형상의 요크부와, 상기 요크부의 일측 연부에 폭방향으로 돌출되고 길이방향을 따라 소정의 피치로 이격 배치되는 복수의 티스부와, 상기 각 티스부의 두께방향을 따라 일측에서 함몰되어 타측으로 돌출되도록 형성되는 돌기수용홈 및 결합돌기를 구비한 선형코어강판을 상기 티스부가 외측으로 향하도록 나선상으로 적층하여 상기 결합돌기가 두께방향을 따라 인접된 상기 돌기수용홈에 삽입되도록 하여 서로 고정되는 것을 특징으로 하는 외치형 스파이럴 스테이터코어.A belt-shaped yoke portion having a length longer than the width, a plurality of tooth portions protruding in the width direction at one side edge of the yoke portion and spaced apart at a predetermined pitch along the length direction, and along the thickness direction of the respective tooth portions A linear core steel plate having protrusion receiving grooves and coupling protrusions formed to be recessed on one side and protruding to the other side is stacked in a spiral so that the teeth are directed outwards, and the coupling protrusion is inserted into the adjacent protrusion accommodation grooves along the thickness direction. External spiral stator core, characterized in that fixed to each other. 제1항에 있어서,The method of claim 1, 상기 요크부의 폭방향을 따라 상기 티스부의 대향측 연부에는 폭방향으로 절취된 복수의 노치부가 형성되어 있는 것을 특징으로 하는 외치형 스파이럴 스테이터코어. An outer tooth type spiral stator core, characterized in that a plurality of notches cut in the width direction are formed at opposite edges of the tooth portion along the width direction of the yoke portion. 제2항에 있어서,The method of claim 2, 상기 노치부는 상기 각 티스부 사이에 대응되게 형성되는 것을 특징으로 하는 외치형 스파이럴 스테이터코어. The notch portion is formed external spiral stator core, characterized in that formed between each of the teeth. 제1항 내지 제3항중 어느 한 항에 있어서,The method according to any one of claims 1 to 3, 상기 결합돌기는 원형단면형상 및 사각단면형상 중 어느 하나로 형성되는 것을 특징으로 하는 외치형 스파이럴 스테이터코어.The engaging protrusion is an external tooth type spiral stator core, characterized in that formed in any one of a circular cross-section and a rectangular cross-sectional shape.
KR1020030068788A 2003-10-02 2003-10-02 External-tooth type spiral stator core KR100548447B1 (en)

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KR1020030068788A KR100548447B1 (en) 2003-10-02 2003-10-02 External-tooth type spiral stator core
US10/952,895 US7271519B2 (en) 2003-10-02 2004-09-30 Laminated body of motor and manufacturing method thereof
US11/889,023 US7459826B2 (en) 2003-10-02 2007-08-08 Laminated body of motor and manufacturing method thereof
US11/836,676 US7728481B2 (en) 2003-10-02 2007-08-09 Laminated body of motor and manufacturing method thereof

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101154994B1 (en) * 2006-06-26 2012-06-14 엘지전자 주식회사 Stator core
KR20140084491A (en) * 2012-12-26 2014-07-07 현대모비스 주식회사 Spiral core and fixing method thereof
KR20150079351A (en) * 2014-01-09 2015-07-08 (주)항남 Pressing Apparatus and Method for Manufacturing Spiral Stator Core for High Efficient Motor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101124077B1 (en) 2010-07-21 2012-03-20 삼성전기주식회사 Stator core and motor device including the same
KR101697653B1 (en) * 2016-07-28 2017-01-18 주진 Stator core of alternator for vehicle

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101154994B1 (en) * 2006-06-26 2012-06-14 엘지전자 주식회사 Stator core
KR20140084491A (en) * 2012-12-26 2014-07-07 현대모비스 주식회사 Spiral core and fixing method thereof
KR20150079351A (en) * 2014-01-09 2015-07-08 (주)항남 Pressing Apparatus and Method for Manufacturing Spiral Stator Core for High Efficient Motor

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