WO2010131582A1 - 積層鉄心 - Google Patents
積層鉄心 Download PDFInfo
- Publication number
- WO2010131582A1 WO2010131582A1 PCT/JP2010/057597 JP2010057597W WO2010131582A1 WO 2010131582 A1 WO2010131582 A1 WO 2010131582A1 JP 2010057597 W JP2010057597 W JP 2010057597W WO 2010131582 A1 WO2010131582 A1 WO 2010131582A1
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- WIPO (PCT)
- Prior art keywords
- connecting portion
- core
- laminated
- divided
- hole
- 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
- 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
- H02K1/148—Sectional cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/10—Incompletely punching in such a manner that the parts are still coherent with the work
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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
- H02K1/16—Stator cores with slots for windings
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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
- H02K15/024—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies with slots
- H02K15/026—Wound cores
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D28/00—Shaping by press-cutting; Perforating
- B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
- B21D28/22—Notching the peripheries of circular blanks, e.g. laminations for dynamo-electric machines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Definitions
- the present invention provides a linear laminated core obtained by laminating a predetermined number of connected divided core pieces obtained by connecting divided yoke pieces obtained by dividing the yoke pieces for each magnetic pole piece with a connecting part that can be bent.
- a laminated iron core (generally referred to as a “bending core”) that is bent into a ring shape, or a connecting portion that can bend a split yoke piece that is obtained by dividing the yoke piece into one or more magnetic pole pieces. It is related with the laminated iron core (generally called a "winding core") formed by bend
- the above-mentioned “bending core” is also referred to as “poki-poki core” in Japanese because each connecting portion bends when the linear laminated iron core is formed in an annular shape.
- the connecting portion that connects the adjacent divided laminated cores is formed on the outermost peripheral portion of the core (specifically, the yoke portion). Is located at the outermost periphery of the yoke, the connecting portion that is bent when the ring shape is formed protrudes further outward from the outer periphery of the core, so that the holding force of the motor core decreases due to interference with the housing, or the motor core itself Problems such as deformation occur.
- JP-A-11-262202 (FIGS. 8 and 9) Japanese Patent Laying-Open No. 2005-160170 (FIGS. 1 and 2)
- the present invention has been made in view of such circumstances, and it is a first object of the present invention to provide a laminated core that relieves the stress generated in the connecting portion and eliminates the occurrence of cracks and breaks in the core piece, and further provides a material yield. It is a second object to provide a laminated iron core with good quality.
- the laminated iron core according to the first aspect of the present invention comprises a predetermined number of linearly connected divided core pieces obtained by connecting the divided yoke pieces divided for each magnetic pole piece with a connecting portion that can be bent, In the laminated iron core that is formed in an annular shape by bending the part, When the number of the divided core pieces in one of the connected divided core pieces is n, the yoke piece on the radially inner side of the connected portion has an opening angle of 360 degrees / n. And having a V-shaped groove that opens radially inward, and a separating portion that separates the adjacent divided yoke piece portions radially outward from the connecting portion in the radially outer yoke piece portion of the connecting portion.
- a first through-hole having a circular arc is formed at the radially outer end of the V-shaped groove in contact with the connecting portion, and a circular arc is formed at the radially inner end of the separating portion in contact with the connecting portion.
- the 2nd through-hole which has is formed.
- the laminated core according to the second aspect of the present invention that meets the above-described object is a strip-like connected divided core piece in which divided yoke pieces divided into one or more magnetic pole pieces are connected by a foldable connecting portion.
- the laminated core formed by bending and winding at the connecting part When the number of the divided yoke pieces until the laminated iron core is wound by one turn is m, the band-like connected divided core pieces are opened at 360 degrees / m on the radially inner side of the connecting portions.
- a V-shaped groove having a corner and opening inward in the radial direction is provided, and a separating portion for separating the adjacent divided yoke piece portions radially outward from the connecting portion is provided on the radially outer side of the connecting portion.
- a first through hole formed by an arc is formed at the radially outer end of the V-shaped groove in contact with the connecting portion, and an arc at the radially inner end of the separating portion in contact with the connecting portion.
- a second through hole is formed.
- the radius of curvature of the second through hole is preferably larger than the radius of curvature of the first through hole.
- the radius of curvature of the second through hole is more preferably in the range of 2 to 15 times the thickness of the connecting divided core piece.
- the first and second through holes may be first and second circular holes, respectively.
- a case where a part of the circular hole is cut out is included.
- the directions of the arcs forming the radially outer side and the radially inner side of the connecting portion formed by the first and second through holes are equal.
- a V-shaped or U-shaped connecting portion can be formed.
- the width of the connecting portion formed by the first and second through holes is preferably equal to the minimum width of the connecting portion with an error of 0 to 20%.
- the width of the connecting portion is not uniform exceeding 20% with respect to the minimum portion, stress is concentrated on the portion of the minimum width at the time of bending, and the deformation in the thickness direction is likely to increase.
- the center of the radius of curvature of the arc that forms the radially outer side and the radially inner side of the connecting portion may be located radially inward from the connecting portion.
- the line which forms the radial direction outer side and radial direction inner side of the said connection part can also be made into the straight line which each enlarged the curvature of the said circular arc.
- the center of the radius of curvature of the arc forming the radially outer side and the radially inner side of the connecting portion may be located on the radially outer side of the connecting portion.
- the laminated iron core formed in an annular shape has an outer position in the radial direction of the connecting portion at least 3% of the radius of the laminated iron core from the outermost position (more preferably 5% or 10% or more) is preferable.
- the groove bottom position of the V-shaped groove is outside the position of 40% from the inside in the radial direction length of the divided yoke piece.
- the separating portion may be a V-shaped groove or a U-shaped groove.
- the laminated iron core according to the present invention has the following effects. (1) First, a predetermined number of linearly connected divided core pieces obtained by connecting divided yoke pieces divided for each magnetic pole piece portion with connecting portions that can be bent are stacked, and the connecting portions are bent to form a first shape.
- a laminated iron core (bending core) according to the invention or a band-like connected divided core piece in which divided yoke piece parts divided into one or more magnetic pole piece parts are connected by a foldable connecting part is bent at the connecting part and wound.
- the laminated iron core (winding core) according to the second invention formed by turning since the separating portion is provided on the radially outer side of the connecting portion via the second through hole having an arc, Since the stress (tensile force) generated when the connecting portion is bent is absorbed by the second through-hole and no extreme stress concentration occurs, the portion is unlikely to crack or break, and the laminated iron core that is the product Quality is ensured.
- a V-shaped groove is formed on the radially inner side of the connecting portion via a first through hole having an arc on the radially outer side of the connecting portion. Since the cut-off portion is formed through the second through hole having an arc, punching and shearing processing of the V-shaped groove and the cut-out portion is facilitated, and the life of the blade can be secured.
- segmentation iron core piece used for the manufacturing method of the same laminated iron core It is a schematic diagram explaining the yield of the laminated core. It is explanatory drawing which shows the boarding situation of the connection division
- (A) is explanatory drawing of the laminated iron core which concerns on the 2nd Example of this invention
- (B) is explanatory drawing of the laminated iron core which concerns on the 3rd Example of this invention. It is explanatory drawing of the laminated iron core which concerns on the 4th Example of this invention. It is explanatory drawing of the laminated iron core which concerns on the 5th Example of this invention. It is explanatory drawing of the laminated iron core which concerns on the 6th Example of this invention. It is explanatory drawing of the laminated iron core which concerns on the 7th Example of this invention. It is explanatory drawing of the laminated iron core which concerns on the further another Example of this invention.
- (A), (B) is explanatory drawing of the manufacturing method of the laminated core which concerns on a prior art example, respectively.
- FIG. 1 shows a laminated core 10 according to a first embodiment of the present invention.
- the laminated iron core 10 is a stator core of a motor, and as shown in FIG. 2, a linear connection division in which a plurality of divided yoke piece portions 12 divided for each magnetic pole piece portion 11 are connected by a bendable connection portion 13.
- a predetermined number of core pieces 14 are stacked, and the connecting portion 13 is bent to form an annular shape.
- the radially outer position 15 of the connecting portion 13 is the inner position of 3% or more (preferably 5% or more, more preferably 10% or more) of the radius R of the laminated core 10. It is in. Further, the radially inner position 16 of the connecting portion 13 is located outside the inner position of the divided yoke piece portion 12 by exceeding 40% (preferably 50% or more) of the width H of the divided yoke piece portion 12.
- the width w of the connecting portion 13 is preferably in the range of 0.3 to 1% (or 1 to 5 times the plate thickness) of the radius R of the laminated core 10, for example.
- segmentation iron core piece 14 is stamped and formed, for example from a linear long strip material.
- a V-shaped groove 17 having an opening angle ⁇ is opened on the radially outer side of the connecting portion 13.
- a separation portion 18 that separates adjacent divided yoke piece portions 12 radially outward from the portion 13 is formed.
- the opening angle ⁇ is 360 ° / n, where n is the number of magnetic poles of the laminated core 10, that is, the number of divided core pieces 19 of the connected divided core pieces 14.
- the first through-hole 20 is an example of a first through-hole 20 having a circular arc in contact with the connecting portion 13 at the bottom (that is, radially outward) of each V-shaped groove 17 formed in the connecting divided iron core piece 14 in a straight state.
- a second circular hole which is an example of the second through hole 21 having an arc in contact with the connecting portion 13 is formed on the inner side in the radial direction of each separating portion 18.
- the separating part 18 is opened by an angle ⁇ , and the V-shaped groove 17 is closed and comes into contact.
- the separation part 18 becomes a V-shaped groove having an angle ⁇ .
- the core material can be saved by setting the position of the connecting portion 13 to an inner position of 3% or more of the radius R from the outermost position of the laminated core. The reason for this will be described with reference to FIG. As schematically shown in FIG. 3 and FIG. 4, if the connecting portion 13 a is at the outermost part of the laminated core 10 (that is, the split core piece 19), the connecting split core is ignored when the length of the connecting portion 13 a is ignored. In the piece 14a, the interval L between the adjacent divided core pieces 19 is 2R ⁇ sin (360 ° / 2n).
- the connecting divided core piece 14 in which the connecting portion 13 is disposed radially inward is shorter than the connecting divided core piece 14 a by ⁇ , and the material yield can be improved. Since the material reduction rate is (L ⁇ L1) / L ⁇ 100%, if the distance from the outermost periphery of the motor core of the connecting portion is h (that is, L ⁇ L1 ⁇ h), this is expressed as h / R. As a result, the position is determined depending on where the connecting portion 13 is arranged in the radial direction.
- a first through hole 20 made of a circular hole is formed on the radially inner side of the connecting portion 13 before bending, and a second through hole 21 made of a circular hole is formed on the radially outer side of the connected portion 13. Yes.
- the diameter of the second through hole 21 made of a circular hole is 2 to 5 times larger than that of the first through hole 20 made of a circular hole. Therefore, the radius of curvature r2 of the arc formed on the radially outer side of the connecting portion 13 is sufficiently larger than the radius of curvature r1 of the arc formed on the radially inner side of the connecting portion 13.
- the radius of curvature r2 is larger than the radius of curvature r1 of the arc formed on the radially inner side of the connecting portion 13 (for example, 2 to 15 times the thickness of the connecting divided core piece 14), so that the connecting portion 13 is connected when it is bent. The generation of cracks and cracks that are likely to occur on the outer side in the radial direction of the portion 13 is suppressed. If the radius of curvature r2 exceeds 15 times the thickness of the connected divided core piece 14, the magnetic path of the yoke portion is remarkably narrowed and the performance of the motor core is deteriorated.
- first and second through holes 20 and 21 for example, circular holes
- a press working blade is formed at the bottom of the V-shaped groove 17 and the radially inner end of the cut-off portion 18 as described above.
- the first and second through holes 20 and 21 need not be circular holes that are in contact with the connecting portion 13, but are not limited to a circular shape.
- the first and second through holes 20 and 21 may be elliptical, oval, or fan-shaped. Also good.
- FIG. 5 shows a laminated connected divided core 10a formed by caulking and stacking the connected divided core pieces 14 formed as described above.
- the magnetic pole portions 11a are wound and bent at the connecting portions 13 in FIG. It becomes the laminated core 10 to show.
- the cut-out portion formed on the radially outer side of the connecting portion 29 that connects the adjacent divided yoke pieces 27 and 28 of the connecting divided core pieces to be used is the V-shaped groove 30. It is said. In this case, when the opening angle of the V-shaped groove 30 is ⁇ 1 (for example, 5 to 30 degrees) and the opening angle of the V-shaped groove 17 formed inside the connecting portion 29 is ⁇ , the V formed in the laminated iron core 24 is obtained.
- the opening angle of the groove 30 is ( ⁇ 1 + ⁇ ).
- the laminated core 25 according to the third embodiment of the present invention shown in FIGS. 1 and 6B is the same as the laminated core 10 according to the first embodiment, but the separating portion 33 has a certain width (for example, , 0.3 to 2 mm or 1 to 5 times the plate thickness).
- the separation part 33 becomes a U-shaped groove.
- the width of the separation part 33 is preferably as small as possible.
- a V-shaped groove 49 is formed on the radially inner side of the connecting portion 48, and a round hole is formed at the top on the radially outer side.
- One through hole 50 is formed.
- the 2nd through-hole 51 which consists of a bending hole is provided in the radial direction outer side of the connection part 48, and the cutting
- the centers of the radii of curvature r1 and r2 of the outer circle 53 and the inner circle 54 that form the radial end of the second through hole 51 and the radius of curvature r3 of the first through hole 50 are the center of the first through hole 50. Since it is in the same position as the center, the width of the connecting portion 48 is uniform in the circumferential direction. Therefore, when the connecting portion 48 is bent, a bending stress is evenly applied in the circumferential direction of the connecting portion 48 and, as a result, the load is dispersed, so that the stress applied to the connecting portion 48 is partially relieved.
- the center of the radius of curvature r1 of the outer circle 53 is also coincident with the center of the first through hole 50, but this is not an essential requirement. Further, the center of the inner circle 54 of the second through hole 51 may be different from the center of the first through hole 50 within a certain range. In this case, it is preferable that the width of the connecting portion 48 be equal to the minimum width of the connecting portion 48 with an error of 0 to 20% (the same applies to the following fifth and sixth embodiments). That is, the direction of the arc of the inner circle 54 of the second through hole 51 that forms the connecting portion 48 and the direction of the arc of the first through hole 50 are in the same direction (radially outward). As a result, a substantially equal load is applied to the connecting portion 48, and the distortion of the connecting portion 48 is within a range that does not hinder the production of the laminated core.
- a laminated core connecting portion 56 according to a fifth embodiment of the present invention shown in FIG. 8 will be described.
- a V-shaped groove 58 is formed on the radially inner side of the connecting portion 56 via a first through hole 57, and a second through hole 59 is formed on the radially outer side of the connecting portion 56.
- a separation part 60 is provided via the.
- the first and second through holes 57 and 59 are rectangular notches each having a long side in a direction orthogonal to the radial direction, and the punching line 61 on the radially inner side of the connecting portion 56 and the punching on the radially outer side are formed.
- the line 62 becomes a parallel straight line (that is, the radius of curvature of the arc is large, for example, infinite), and the connecting portion 56 has a uniform width in the circumferential direction (that is, a direction orthogonal to the radial direction). ing.
- the connecting portion 56 When the connecting portion 56 is bent, the separating portion 60 opens in a V shape, and the V-shaped groove 58 is closed. In this case, the connecting portion 56 is slightly bent, but since the radial width is uniform, the load is dispersed and deformation in the plate thickness direction is small.
- connection part 64 of the laminated iron core which concerns on the 6th Example of this invention shown in FIG. 9 is demonstrated.
- a V-shaped groove 66 is formed on the inner side in the radial direction of the connecting portion 64 via a first through hole 65, and on the outer side in the radial direction of the connecting portion 64, a second through hole 67 made of a round hole is provided.
- a separating portion 68 is provided.
- the center of the radius of curvature of the arc 65 a radially outside the first through-hole 65, that is, the arc 65 a forming the radially inner side of the connecting portion 64, is provided on the radially outer side of the connecting portion 64.
- the direction of the arc of the first through hole 65 that forms the inside of the connecting portion 64 and the direction of the arc of the second through hole 67 that forms the outside of the connecting portion 64 are the same direction (radial direction). Facing inward).
- the direction of the circular arc which forms the outer side and inner side of the connection part 48 may face the radial direction outer side.
- the connecting portion 64 since the center of the radius of curvature of the arc 65a and the center of the second through hole 67 are at substantially the same position, the connecting portion 64 has substantially the same width in the radial direction. Therefore, when the connecting portion 64 is bent, a partial bending load is not applied to the connecting portion 64, and distortion and deformation in the plate thickness direction are reduced.
- the connected divided core piece 37 is formed by connecting divided yoke pieces 39 each having a plurality of (three in this embodiment) magnetic pole piece portions 38 via connecting portions 40. And this strip-shaped connection division
- two such connected divided core pieces 37 are prepared, and the position of each connecting portion 40 is shifted by one magnetic pole piece.
- segmentation iron core piece 37 is demonstrated, the structure is the same also in the connection division
- the radially outermost portion of the connecting portion 40 in the laminated core 36 is at least 3% inside the radius R from the outer periphery with respect to the radius R of the laminated core 36, and the radially innermost portion of the connecting portion 40 ( That is, the groove bottom position of the V-shaped groove 43 is located outside the yoke portion (specifically, the divided yoke piece portion 39) from the inside to the outside of the yoke portion over 40% of the radial width.
- the width of the connecting portion 40 is preferably in the range of 1 to 5 times the plate thickness of the divided core piece in consideration of the strength of the connecting portion 40 and the ease of bending.
- the yield of material improves by arrange
- connection part 40 segmentation iron core piece 37 used when manufacturing this laminated iron core 36, as shown to the elements on larger scale of FIG. 10, the radial direction inner side and outer side of the connection part 40 are respectively 1st which consists of a circular hole, respectively.
- Second through holes 41 and 42 are formed.
- the first and second through holes 41 and 42 need not be circular holes in contact with the connecting portion 40, but are not limited to a circular shape, and may be, for example, an ellipse, an ellipse, or a fan shape.
- a V-shaped groove 43 is formed on the inner side in the radial direction of the first through hole 41, and a separation portion 44 is formed on the outer side in the radial direction of the second through hole 42.
- Reference numeral 46 denotes a winding shaft.
- the radius of curvature of the second through hole 42 that contacts the connecting portion 40 is in the range of 2 to 15 times (more preferably 2 to 5 times) the radius of curvature of the first through hole 41.
- the three magnetic pole piece portions 38 are provided for one divided yoke piece portion 39, but may be 1, 2 or 4 or more. Further, this laminated iron core 36 was obtained by lap-wrapping two connected divided core pieces 37, but one or three or more connected divided core pieces 37 were wound in an annular manner by shifting the positions of the respective connecting portions. An iron core can also be manufactured.
- a first through hole for example, a circular hole
- the separating portion 44 is formed as shown in FIG.
- a parallel groove specifically a U-shaped groove
- a V-shaped groove as shown in FIG. 6A (applicable to all the embodiments).
- Adjacent divided yoke pieces can be connected so as to be bendable using the connecting portions used in the laminated cores according to the first to sixth embodiments.
- the laminated core with the magnetic pole pieces facing inward in the radial direction has been described.
- FIG. It can also be applied to laminated iron cores facing outward.
- FIG. 11 reference numerals corresponding to the laminated core and the core piece shown in FIG.
- the radius of curvature of the arc on the radially outer side of the connecting portion can be made equal to the radius of curvature of the arc formed on the radially inner side of the connecting portion.
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Abstract
Description
そのため、特許文献1、2に示されるように、各分割鉄心片60、61を連結する連結部62、63を折り曲げて全体を環状に形成した場合、連結部62、63をヨークの最外周部65、66よりやや半径方向内側に設けるものが提案されている(図12(A)、(B)参照)。
また、連結部で連結された各分割鉄心片を直線状に形成する時点において、連結部が外周部に近いほど全体の直線長さが長くなり、材料歩留まりを低下させるという問題があった。
前記直線状の連結分割鉄心片は、一つの前記連結分割鉄心片における分割鉄心片の数をnとした場合、前記連結部の半径方向内側のヨーク片部には、360度/nの開き角を有して半径方向内側に開くV字溝を有すると共に、前記連結部の半径方向外側のヨーク片部には、該連結部より半径方向外側の隣り合う前記分割ヨーク片部を分離する切り離し部を有し、しかも前記連結部と接する前記V字溝の半径方向外側端部には円弧を有する第1の貫通孔が、前記連結部に接する前記切り離し部の半径方向内側端部には円弧を有する第2の貫通孔が形成されている。
前記帯状の連結分割鉄心片は、該積層鉄心を1周分巻回するまでの前記分割ヨーク片部の数をmとした場合、前記連結部の半径方向内側には、360度/mの開き角を有して半径方向内側に開くV字溝を有すると共に、前記連結部の半径方向外側には、該連結部より半径方向外側の隣り合う前記分割ヨーク片部を分離する切り離し部を有し、しかも前記連結部に接する前記V字溝の半径方向外側端部には円弧によって形成される第1の貫通孔が、前記連結部に接する前記切り離し部の半径方向内側端部には円弧によって形成される第2の貫通孔が形成されている。
更に、前記第1、第2の貫通孔によって形成される前記連結部の幅は、該連結部の最小幅に対して0~20%の誤差で等しいのが好ましい。ここで、連結部の幅が最小部に対して20%を超えて一様でなくなると、折り曲げ時に最小幅の部分に応力が集中し、厚み方向の変形が大きくなり易いからである。
また、第1、第2の発明に係る積層鉄心において、前記切り離し部はV字溝又はU字溝であってもよい。
(1)各磁極片部毎に分割した分割ヨーク片部を折り曲げ可能な連結部で繋いだ直線状の連結分割鉄心片を所定枚数積層し、連結部を折り曲げて環状に形成される第1の発明に係る積層鉄心(折り曲げコア)や、1又は2以上の磁極片部毎に分割した分割ヨーク片部を折り曲げ可能な連結部で繋いだ帯状の連結分割鉄心片を、連結部で折り曲げて巻回して形成される第2の発明に係る積層鉄心(巻きコア)においては、連結部の半径方向外側には、円弧を有する第2の貫通孔を介して、切り離し部が設けられているので、連結部の折り曲げ時に発生する応力(引っ張り力)が第2の貫通孔によって吸収され、極端な応力集中を生ずることがないので、その部分に亀裂や破断等が生じにくく、製品となる積層鉄心の品質が確保される。
(6)切り離し部をV字溝又はU字溝によって形成した場合は、プレス加工が容易となり、刃物の寿命も伸びる。
連結分割鉄心片14の各分割ヨーク片部12の連結部13の半径方向内側には、半径方向内側に開き、開き角θのV字溝17が、連結部13の半径方向外側には、連結部13より半径方向外側の隣り合う分割ヨーク片部12を分離する切り離し部18が形成されている。開き角θは、積層鉄心10の磁極数、即ち、連結分割鉄心片14の分割鉄心片19の数をnとした場合、360°/nとなる。
図3、図4に模式的に示すように、連結部13aが積層鉄心10(即ち、分割鉄心片19)の最外部にあったとすると、連結部13aの長さを無視した場合、連結分割鉄心片14aにおいて、隣り合う分割鉄心片19の間隔Lは、2R・sin(360°/2n)となる。一方、連結部13を積層鉄心10の半径方向内側に位置させた場合は、その半径位置をR1(<R)とすると、隣り合う分割鉄心片19の間隔L1は、2R1・sin(360°/2n)(<L)となる。
なお、第1、第2の貫通孔20、21は、連結部13に接する円弧を有する貫通孔である必要はあるが、円形に限定されず、例えば、楕円、長円、扇形状であってもよい。
図5には、このようにして形成された連結分割鉄心片14をかしめ積層した積層連結分割鉄心10aを示すが、各磁極部11aに巻線を行って、連結部13で折り曲げて図1に示す積層鉄心10となる。
第1~第6の実施例に係る積層鉄心に用いた連結部を用いて、隣り合う分割ヨーク片部を折り曲げ可能に連結することもできる。
以上の実施例に係る積層鉄心において、連結部の半径方向外側の円弧の曲率半径と、連結部の半径方向内側に形成される円弧の曲率半径を等しくすることもできる。
Claims (12)
- 各磁極片部毎に分割した分割ヨーク片部を折り曲げ可能な連結部で繋いだ直線状の連結分割鉄心片を所定枚数積層し、前記連結部を折り曲げて環状に形成される積層鉄心において、
前記直線状の連結分割鉄心片は、一つの前記連結分割鉄心片における分割鉄心片の数をnとした場合、前記連結部より半径方向内側のヨーク片部には、360度/nの開き角を有して半径方向内側に開くV字溝を有すると共に、前記連結部より半径方向外側のヨーク片部には、該連結部より半径方向外側の隣り合う前記分割ヨーク片部を分離する切り離し部を有し、しかも前記連結部と接する前記V字溝の半径方向外側端部には円弧を有する第1の貫通孔が、前記連結部と接する前記切り離し部の半径方向内側端部には円弧を有する第2の貫通孔が形成されていることを特徴とする積層鉄心。 - 1又は2以上の磁極片部毎に分割した分割ヨーク片部を折り曲げ可能な連結部で繋いだ帯状の連結分割鉄心片を、前記連結部で折り曲げて巻回して形成される積層鉄心において、
前記帯状の連結分割鉄心片は、該積層鉄心を1周分巻回するまでの前記分割ヨーク片部の数をmとした場合、前記連結部の半径方向内側には、360度/mの開き角を有して半径方向内側に開くV字溝を有すると共に、前記連結部の半径方向外側には、該連結部より半径方向外側の隣り合う前記分割ヨーク片部を分離する切り離し部を有し、しかも前記連結部に接する前記V字溝の半径方向外側端部には円弧によって形成される第1の貫通孔が、前記連結部に接する前記切り離し部の半径方向内側端部には円弧によって形成される第2の貫通孔が形成されていることを特徴とする積層鉄心。 - 請求項1又は2記載の積層鉄心において、前記第2の貫通孔の曲率半径は、前記第1の貫通孔の曲率半径より大きいことを特徴とする積層鉄心。
- 請求項3記載の積層鉄心において、前記第2の貫通孔の曲率半径は、前記連結分割鉄心片の厚みの2~15倍の範囲にあることを特徴とする積層鉄心。
- 請求項1~4のいずれか1記載の積層鉄心において、前記第1、第2の貫通孔はそれぞれ第1、第2の円孔であることを特徴とする積層鉄心。
- 請求項1~3のいずれか1記載の積層鉄心において、前記第1、第2の貫通孔によって形成される前記連結部の半径方向外側及び半径方向内側を形成する円弧の向きは等しいことを特徴とする積層鉄心。
- 請求項6記載の積層鉄心において、前記連結部の半径方向外側及び半径方向内側を形成する円弧の曲率半径の中心は、前記連結部より半径方向内側に位置することを特徴とする積層鉄心。
- 請求項6記載の積層鉄心において、前記連結部の半径方向外側及び半径方向内側を形成する線は、それぞれ前記円弧の曲率を大きくした直線であることを特徴とする積層鉄心。
- 請求項6記載の積層鉄心において、前記連結部の半径方向外側及び半径方向内側を形成する円弧の曲率半径の中心は、前記連結部の半径方向外側にあることを特徴とする積層鉄心。
- 請求項1~9のいずれか1記載の積層鉄心において、環状に形成した該積層鉄心は、前記連結部の半径方向外側位置が最外位置より該積層鉄心の半径の3%以上の内側位置にあることを特徴とする積層鉄心。
- 請求項1~10のいずれか1記載の積層鉄心において、前記V字溝の溝底位置は、前記分割ヨーク片部の半径方向長さの内側から40%位置より外側にあることを特徴とする積層鉄心。
- 請求項1~11のいずれか1記載の積層鉄心において、前記切り離し部はV字溝又はU字溝であることを特徴とする積層鉄心。
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