WO2011030611A1 - 固定子鉄心及びその製造方法 - Google Patents
固定子鉄心及びその製造方法 Download PDFInfo
- Publication number
- WO2011030611A1 WO2011030611A1 PCT/JP2010/061626 JP2010061626W WO2011030611A1 WO 2011030611 A1 WO2011030611 A1 WO 2011030611A1 JP 2010061626 W JP2010061626 W JP 2010061626W WO 2011030611 A1 WO2011030611 A1 WO 2011030611A1
- Authority
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- WIPO (PCT)
- Prior art keywords
- stator core
- piece
- magnetic pole
- pole piece
- thickness direction
- Prior art date
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/022—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with salient poles or claw-shaped poles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K37/00—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors
- H02K37/02—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of variable reluctance type
- H02K37/04—Motors with rotor rotating step by step and without interrupter or commutator driven by the rotor, e.g. stepping motors of variable reluctance type with rotors situated within the stators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49009—Dynamoelectric machine
Definitions
- the present invention relates to a stator core used in, for example, a stepping motor that can be plated from a plate-like material (for example, a magnetic metal plate) with a high yield and is excellent in productivity, and a method for manufacturing the same.
- a plate-like material for example, a magnetic metal plate
- a laminated iron core for a stepping motor has a very small air gap between the rotor core and the stator core. It may be pulled out twice without falling down. In addition, the mold may be damaged due to the catching of scrap. In addition, if the teeth formed on the outside of the rotor core piece and the small teeth formed on the inside of the stator core piece cannot be punched into a single plate-like material in a desired shape, the rotor core piece and There was a problem that the stator core pieces had to be punched with separate molds, resulting in a decrease in material yield and a very high cost.
- Patent Document 1 As a conventional technique for solving the above-described problem, for example, as described in Patent Document 1, at least one surface of a rotor core piece and a stator core piece is pressed thinly in a plate thickness direction and flattened. There has been proposed a structure in which a rotor mold and a stator core piece can be taken together with a single mold.
- Patent Document 1 Since the technique described in Patent Document 1 is pressing from one side in the plate thickness direction when forming a thin portion, particularly when the magnetic pole tip is extended radially inward, the magnetic pole piece is warped. Then, it is necessary to forcibly return the warp in the subsequent caulking, and there is a problem that the caulking accuracy and the inner diameter accuracy of the core are not stable. In addition, this problem has a negative effect on the product quality because the warpage increases when the pressure is deeply applied to increase the stretch amount.
- the present invention has been made in view of such circumstances, and it is possible to eliminate the curvature of the magnetic pole piece when forming the thin-walled portion and extending the magnetic pole piece, and the caulking accuracy and the rotor core piece and the stator iron core can be eliminated. It is an object of the present invention to provide a stator core that improves the dimensional accuracy of a laminated core at the time of taking pieces together, and a method for manufacturing the same.
- a stator core according to a first invention that meets the above-mentioned object is a stator core in which stator core pieces formed by punching out a magnetic metal plate from which a rotor core piece located at the center is punched are stacked.
- the magnetic pole piece portion of the stator core piece is provided with a thin portion formed by pressing from both sides in the thickness direction, and the magnetic pole piece portion extends radially inward.
- the thin portion is preferably formed by pressing the same portion of the magnetic pole piece portion from both sides in the thickness direction, and the thickness of the magnetic pole piece portion. It is more preferable that the cross-sectional shape of the thin-walled grooves formed on both sides in the direction is the same.
- the cross-sectional shape of the thin-walled groove may be a rectangle, or the cross-sectional shape of the thin-walled groove bottom may be an arc.
- the rectangle includes not only a regular rectangle but also a rectangle with rounded corners.
- the stator core manufacturing method according to the second invention that meets the above-mentioned object is a stator core in which stator core pieces are formed by punching from a magnetic metal plate from which a rotor core piece located in the center is removed.
- a manufacturing method of The same or different portions of the magnetic pole piece portion of the stator core piece are pressed from both sides in the thickness direction to form a thin portion, and the magnetic pole piece portion is extended radially inward by a predetermined length.
- the pressing from both sides in the thickness direction may be performed once or a plurality of times.
- stator core manufacturing method according to the second aspect of the present invention it is preferable that the thin portion is formed on a straight piece portion of the magnetic pole piece portion.
- the magnetic pole piece of the stator core piece is pressed from both sides in the thickness direction (to the same place or different places) to form a thin part, and the pole piece is radiused. Since it is not necessary to press the punch deeply from the surface of one side as in the past, it is possible to prevent bending (warping) of the magnetic pole piece, and to improve the caulking accuracy and the inner diameter accuracy of the stator core during co-capping. To do. Furthermore, by forming the thin portion by pressing both sides in the thickness direction, it is possible to extend the inner side in the radial direction longer without changing the magnetic characteristics than when only one side in the thickness direction is pressed to form the thin portion. Moreover, the magnetic characteristics are further improved while obtaining the same amount of stretching as when the pole piece is stretched by pressing only one side in the thickness direction.
- FIG. 1 is a perspective view of a stator core and a rotor core paired with the stator core according to an embodiment of the present invention.
- (A) is a plan view of a stator core piece used for the stator core
- (B) is a cross-sectional view taken along line AA. It is process drawing which shows the manufacturing method of the stator core which concerns on one Example of this invention.
- (A) is an explanatory view of one step of the manufacturing method of the stator core, and (B) to (D) are explanatory views showing a cross-sectional shape of a groove according to a modification.
- (A), (B) is explanatory drawing of the test piece performed in order to confirm the effect
- a stator core 10 As shown in FIG. 1, a stator core 10 according to an embodiment of the present invention is used for a stepping motor, and a plurality of magnetic pole portions 12 are provided inside an annular yoke portion 11.
- the magnetic pole portion 12 has a winding portion 13 and pole teeth 14 provided on the radially inner side of the winding portion 13, and a plurality of small teeth 15 are provided on the radially inner side of each pole tooth 14.
- the stator core 10 is formed by caulking and stacking a plurality of stator core pieces 17 (see FIG. 2) via caulking portions 16, and the shape of the stator core piece 17 is a stator core 10 in plan view.
- the yoke piece portion 18 is provided around the periphery, and a plurality of magnetic pole piece portions 19 are provided inside the yoke piece portion 18.
- the magnetic pole piece portion 19 includes a straight piece portion 20 that is laminated to form the winding portion 13, and a pole tooth piece portion 21 that is formed radially inside the straight piece portion 20.
- the small teeth 22 are formed.
- the straight piece portion 20 of the magnetic pole piece portion 19 is provided with a thin portion 24 formed by pressing the same portion from both sides in the thickness direction.
- Grooves 25 and 26 having a rectangular cross section are formed on the front and back of the thin portion 24.
- the grooves 25 and 26 have the same shape, the groove depth b is 2 to 20% of the plate thickness (for example, when the plate thickness is 0.5 mm), and the groove width a is 1 to 6 for example. It is about double.
- the caulking portion 16 may be half-cut caulking or V-shaped caulking.
- the thin portion 24 is formed on the inner side in the radial direction of the straight piece portion 20, but may be disposed on the central portion or the outer side in the radial direction of the straight piece portion 20.
- FIG. 1 shows a rotor core 28 that is paired with the stator core 10.
- the rotor core 28 has a shaft hole 29 in the center and a large number of teeth 30 around it.
- the tips of the teeth 30 have a slight gap from the tips of the small teeth 15 of the stator core 10 so that the rotor core 28 can rotate in the stator core 10.
- the manufacturing method of the stator core which concerns on one Example of this invention is demonstrated, referring FIG.
- the stator core manufacturing apparatus to which the stator core manufacturing method according to one embodiment of the present invention is applied has stations A to I.
- the thickness is, for example, 0.3.
- Pilot holes 33 are formed in a long magnetic metal plate 32 of about 1 mm.
- the shaft hole 29 is formed in the magnetic metal plate 32 positioned by the four pilot holes 33.
- the caulking portion 35 is formed around the shaft hole 29, and in the station D, the rotor core piece 36 is removed from the outer shape and laminated in a mold to manufacture the rotor core 28.
- slots 37 forming the outlines of the magnetic pole piece portions 19 of the stator core piece 17 are punched out from the magnetic metal plate 32 from which the rotor core piece 36 in the central portion has been removed.
- the straight piece 20 constituting each magnetic pole piece 19 is partially pressed (coined) to form the thin portion 24.
- the thin portions 24 are each arcuate and are on the same circle as a whole, but the thin portions may be linear.
- the rotor core piece 36 and the stator core piece 17 are formed concentrically.
- FIG. 4 (A) This state is shown in FIG. 4 (A).
- the straight piece 20 is pressed from above and below by punches (convex molds) 38 and 39 to form grooves 25 and 26 having a predetermined width and a predetermined depth. .
- the outer side in the radial direction of the straight piece 20 is constrained by the yoke piece 18, so that the straight piece 20 extends inward in the radial direction.
- the material may be pressed and fixed on the die with a wedge-shaped V-ring 20a. Good. Of course, it is possible to omit the V-ring 20a.
- wide grooves 40 and 41 can be formed as shown in FIG. 4 (B) by a punch that presses (coines) the straight piece portion 20 from the upper and lower sides to the same place, as shown in FIG. 4 (C).
- narrow grooves 42 and 43 can be formed.
- the groove bottom surfaces 44 and 45 may be formed into grooves 46 and 47 having arcuate cross sections.
- a wide groove can be formed by pressing a plurality of times with a small punch (for example, a narrow punch).
- the extending length L of the pole piece 19 is substantially proportional to the total volume of the upper and lower grooves. That is, it substantially corresponds to (total cross-sectional area of upper and lower grooves) ⁇ (groove width). If the depth of the groove is increased to reduce the thickness of the thin portion, the magnetic resistance increases and the magnetic properties of the stator core 10 deteriorate. Therefore, the total cross-sectional area of the upper and lower grooves and the thickness of the thin portion must be taken into consideration. Design the shape of the upper and lower grooves.
- the caulking portion 16 necessary for the straight piece portion 20 and the pole tooth piece portion 19 is formed.
- a caulking portion can also be formed on the yoke piece portion 18.
- the pole tooth piece 21 is punched and formed inside the magnetic pole piece 19. In this case, since the magnetic pole piece portion 19 extends radially inward, the pole tooth piece portion 21 having the small teeth 22 on the radially inner side can be formed.
- the outer shape is removed at the station I, and the stator core pieces 17 are caulked and laminated in a mold, whereby the stator core 10 is manufactured.
- FIG. 5 (A) a groove 51 having a width of 1 mm and a depth of 0.225 mm is formed from one side in the center of an iron core piece (electromagnetic steel plate) 50 having a length of 120 mm, a width of 30 mm, and a thickness of 0.5 mm.
- FIG. 5B shows a test piece having a width of 1 mm and a depth of 0. 0 in the center of an iron core piece 52 made of the same material as the iron core piece 50 having a length of 120 mm, a width of 30 mm, and a thickness of 0.5 mm.
- FIGS. 5 (A) and 5 (B) The test piece which formed the groove
- Reference numeral 51a denotes a corner of the groove 51
- reference numerals 53a and 54a denote corners of the grooves 53 and 54, respectively.
- the flow of magnetic flux when a magnetic field of 50 Hz and 224 A / m was applied to the core pieces 50 and 52 was confirmed by magnetic field analysis.
- the magnetic flux is generated at the corners 53a and 54a of the grooves 53 and 54.
- the core piece 50 had a magnetic flux amount 0.2T less than that of the core piece 52. From this, it can be seen that the magnetic properties of the iron core piece 52 provided with the grooves 53 and 54 from both sides are improved.
- the present invention is not limited to the above-described embodiments, and the present invention can be applied even if the number of magnetic poles and the shape of the pole teeth are changed without departing from the gist of the present invention.
- the thin part pressed the same location of the magnetic pole piece part from the thickness direction both sides, the different location (including the case where it overlaps partially) of a magnetic pole piece part is pressed from the thickness direction both sides.
- the present invention is also applied to cases.
- the magnetic pole piece portion is formed by pressing the magnetic pole piece portion of the stator core piece from both sides in the thickness direction (to the same location or different locations). Are uniformly stretched radially inward. And an effective machining allowance is given by the pole tooth piece part, and a more accurate stator core piece can be manufactured.
- By pressing both sides in the thickness direction to form a thin part it can be stretched longer in the radial direction without changing the magnetic characteristics than when only one side in the thickness direction is pressed to form a thin part, more efficient A good motor can be manufactured.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Motors, Generators (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
前記固定子鉄心片の磁極片部の同一箇所又は異なる箇所を厚み方向両側から押圧して薄肉部を形成して、前記磁極片部を半径方向内側に所定長さだけ延伸する。この厚み方向両側からの押圧は一回であってもよいし、複数回であってもよい。
そして、第2の発明に係る固定子鉄心の製造方法において、前記薄肉部は前記磁極片部のストレート片部に形成されているのが好ましい。
更に、厚み方向両側を押圧して薄肉部を形成することによって、厚み方向片側のみを押圧して薄肉部を形成した場合より磁気的特性を変えずに半径方向内側により長く延伸させることができる。また、厚み方向片側のみを押圧して磁極片部を延伸させた場合と同様の延伸量を得ながらも、磁気的特性は更に向上する。
図3に示すように、本発明の一実施例に係る固定子鉄心の製造方法を適用する固定子鉄心の製造装置は、ステーションA~Iを有し、ステーションAでは、厚みが例えば0.3~1mm程度の長尺の磁性金属板32にパイロット孔33を形成する。ステーションBでは、4つのパイロット孔33で位置決めされた磁性金属板32に軸孔29を形成する。
ステーションHでは、磁極片部19の内側に極歯片部21を打ち抜き形成する。この場合、磁極片部19は半径方向内側に延伸しているので、より半径方向内側に小歯22を有する極歯片部21を形成できる。ステーションIで外形抜きを行って、固定子鉄心片17を金型内でかしめ積層し、固定子鉄心10が製造される。
図5(A)に、長さが120mm、幅が30mm、厚みが0.5mmの鉄心片(電磁鋼板)50の中央に、幅が1mmで深さが0.225mmの溝51を片側から形成した試験片を示し、図 5(B)に長さが120mm、幅が30mm、厚みが0.5mmの鉄心片50と同一材料の鉄心片52の中央に、幅が1mmで深さが0.1125mmの溝53、54を両側から形成した試験片を示す。
なお、図6は図5(A)、(B)において、鉄心片50、52を矩形A位置から側面視したときの磁束の流れを示す。51aは溝51の角部を示し、53a、54aはそれぞれ溝53、54の角部を示す。
Claims (9)
- 中央部に位置する回転子鉄心片が抜き落された磁性金属板から打ち抜き形成された固定子鉄心片を積層した固定子鉄心であって、
前記固定子鉄心片の磁極片部に厚み方向両側から押圧して形成する薄肉部を設け、前記磁極片部が半径方向内側に延伸されていることを特徴とする固定子鉄心。 - 請求項1記載の固定子鉄心において、前記薄肉部は、前記磁極片部の同一箇所を厚み方向両側から押圧して形成されていることを特徴とする固定子鉄心。
- 請求項1又は2記載の固定子鉄心において、前記磁極片部の厚み方向両側に形成された薄肉部の溝の断面形状は同一であることを特徴とする固定子鉄心。
- 請求項3記載の固定子鉄心において、前記薄肉部の溝の断面形状は、矩形であることを特徴とする固定子鉄心。
- 請求項3記載の固定子鉄心において、前記薄肉部の溝底の断面形状は円弧であることを特徴とする固定子鉄心。
- 中央部に位置する回転子鉄心片が抜き落された磁性金属板から打ち抜き形成された固定子鉄心片を積層する固定子鉄心の製造方法であって、
前記固定子鉄心片の磁極片部に厚み方向両側から押圧して薄肉部を形成して、前記磁極片部を半径方向内側に所定長さだけ延伸することを特徴とする固定子鉄心の製造方法。 - 請求項6記載の固定子鉄心の製造方法において、前記薄肉部は、前記磁極片部の同一箇所を厚み方向両側から押圧して形成することを特徴とする固定子鉄心の製造方法。
- 請求項6又は7記載の固定子鉄心の製造方法において、前記薄肉部は厚み方向両側から複数回に分けて押圧されて形成されていることを特徴とする固定子鉄心の製造方法。
- 請求項6~8のいずれか1記載の固定子鉄心の製造方法において、前記薄肉部は、前記磁極片部のストレート片部に形成されていることを特徴とする固定子鉄心の製造方法。
Priority Applications (4)
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KR1020117027581A KR101253689B1 (ko) | 2009-09-09 | 2010-07-08 | 고정자 철심 및 그 제조 방법 |
CN201080023750.0A CN102449880B (zh) | 2009-09-09 | 2010-07-08 | 定子铁心及其制造方法 |
US13/377,413 US8552612B2 (en) | 2009-09-09 | 2010-07-08 | Stator core and method of manufacturing same |
EP10815209.1A EP2445086B1 (en) | 2009-09-09 | 2010-07-08 | Stator core and method for manufacturing same |
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JP2009-208352 | 2009-09-09 | ||
JP2009208352A JP5875746B2 (ja) | 2009-09-09 | 2009-09-09 | 固定子鉄心の製造方法 |
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EP (1) | EP2445086B1 (ja) |
JP (1) | JP5875746B2 (ja) |
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JP6094146B2 (ja) * | 2012-10-26 | 2017-03-15 | 株式会社デンソー | 回転電機の固定子鉄心の製造方法 |
JP6169505B2 (ja) * | 2013-02-19 | 2017-07-26 | 株式会社三井ハイテック | 回転子積層鉄心の製造方法 |
US10855161B2 (en) * | 2017-03-15 | 2020-12-01 | Lin Engineering, Inc. | Hybrid step motor with greater number of stator teeth than rotor teeth to deliver more torque |
KR20200086087A (ko) * | 2019-01-08 | 2020-07-16 | 엘지이노텍 주식회사 | 모터 |
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- 2010-07-08 WO PCT/JP2010/061626 patent/WO2011030611A1/ja active Application Filing
- 2010-07-08 KR KR1020117027581A patent/KR101253689B1/ko not_active IP Right Cessation
- 2010-07-08 US US13/377,413 patent/US8552612B2/en active Active
- 2010-07-08 EP EP10815209.1A patent/EP2445086B1/en not_active Not-in-force
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Also Published As
Publication number | Publication date |
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JP2011061959A (ja) | 2011-03-24 |
KR20120020125A (ko) | 2012-03-07 |
US20120086302A1 (en) | 2012-04-12 |
EP2445086A1 (en) | 2012-04-25 |
CN102449880B (zh) | 2014-05-28 |
EP2445086B1 (en) | 2014-10-22 |
EP2445086A4 (en) | 2013-05-01 |
US8552612B2 (en) | 2013-10-08 |
KR101253689B1 (ko) | 2013-04-11 |
JP5875746B2 (ja) | 2016-03-02 |
CN102449880A (zh) | 2012-05-09 |
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