WO2010150592A1 - 回転子鉄心 - Google Patents
回転子鉄心 Download PDFInfo
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- WO2010150592A1 WO2010150592A1 PCT/JP2010/057557 JP2010057557W WO2010150592A1 WO 2010150592 A1 WO2010150592 A1 WO 2010150592A1 JP 2010057557 W JP2010057557 W JP 2010057557W WO 2010150592 A1 WO2010150592 A1 WO 2010150592A1
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- Prior art keywords
- core
- magnet
- blocks
- rotor core
- magnets
- 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
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
-
- 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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/38—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with rotating flux distributors, and armatures and magnets both stationary
- H02K21/44—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with rotating flux distributors, and armatures and magnets both stationary with armature windings wound upon the magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/06—Means for converting reciprocating motion into rotary motion or vice versa
- H02K7/061—Means for converting reciprocating motion into rotary motion or vice versa using rotary unbalanced masses
- H02K7/063—Means for converting reciprocating motion into rotary motion or vice versa using rotary unbalanced masses integrally combined with motor parts, e.g. motors with eccentric rotors
-
- 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
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
Definitions
- the present invention relates to a rotor core having a plurality of magnets inside.
- Patent Document 1 proposes a method of fixing a magnet in a magnet housing hole formed in the axial direction of a substantially cylindrical rotor core (rotor core).
- the fixing method is to form a rotor core 60 by laminating a plurality of electromagnetic steel plates (iron core pieces) 69 and accommodate the magnet pieces 62 in the magnet accommodation holes 61 of the rotor core 60.
- the resin 63 is filled from the resin pot 65 formed in the upper mold 64 into the magnet accommodation hole 61, and the rotor core 60 and the resin are integrated.
- reference numeral 67 in the figure denotes a plunger for pushing out the resin 63
- reference numeral 68 denotes a lower mold.
- the rotor core 60 and the magnet piece 62 need to be heated to about 140 to 180 ° C. in order to fill the magnet accommodation hole 61 with the resin 63 heated and melted. is there.
- the linear expansion coefficient of the iron core piece 69 is smaller than the linear expansion coefficient of the resin 63 such as an epoxy resin. Therefore, when the iron core piece 69 and the resin 63 are cooled to room temperature, the heat of the iron core piece 69 and the resin 63 is reduced. Due to the difference in shrinkage, a compressive stress in the Z-axis direction acts on the resin 63 and a tensile stress of the reaction force acts on the iron core piece 69. Therefore, when the fastening force between the plurality of stacked core pieces 69 constituting the rotor core 60 is weak, there is a possibility that a phenomenon of core cracking occurs in which the core pieces 69 are separated in the Z-axis direction.
- a plurality of laminated core pieces 69 are caulked and connected to form one core block 70, 71, and a plurality of the core blocks 70, 71 are laminated to each other.
- the caulking connection is the welding or screwing connection. Since the connection strength is higher than that, core cracks are likely to occur at the boundary surface 73 between the core blocks 70 and 71.
- the resin 63 is easily cracked between the boundary surfaces 72 of the adjacent magnet pieces 62, and there is a possibility that a core crack may occur from the crack. Therefore, when the boundary surface 72 of the magnet piece 62 and the position (height position) in the Z-axis direction of the boundary surface 73 of the core blocks 70 and 71 coincide with each other, a core crack is particularly likely to occur.
- the present invention has been made in view of such circumstances, and an object of the present invention is to provide a rotor core that prevents core breakage of the rotor core and improves quality and reliability.
- the present invention provides the following. (1) a plurality of substantially cylindrical core blocks stacked on each other; A rotor core with a plurality of magnets, A plurality of magnet housing holes extending in the axial direction are provided across the plurality of core blocks in the plurality of core blocks, A plurality of the magnets are housed in each of the magnet housing holes and fixed with resin,
- the plurality of magnets have the same length, The rotor core according to (1), wherein the axial dimension of the core block is not a multiple of b, where b is the length of the magnet. (3) The rotor core according to (1) or (2), wherein an axial dimension of at least one of the core blocks is different from an axial dimension of the other core block. (4) The rotor core according to (1) or (2), wherein an axial position of the core block boundary surface and an axial position of the magnet boundary surface are separated by 1 mm or more. (5) The rotor core according to (1) or (2), wherein the core blocks that are in contact with each other are stacked in a state of being rotated 180 degrees in the circumferential direction.
- the magnet housing hole is provided across the plurality of core blocks, and the axial positions of the core block boundary surface and the magnet boundary surface are different, so that the core block boundary surface is straddled.
- One magnet piece is located in each.
- the magnet piece straddling this core block boundary surface is further fixed by resin, the several core block which mutually contact
- FIG. 1st Embodiment of this invention It is a perspective view of the rotor core which concerns on the 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the rotor core shown in FIG. It is a longitudinal cross-sectional view of the rotor core which concerns on the 2nd Embodiment of this invention. It is explanatory drawing of the manufacturing method of the rotor core which concerns on a prior art example. It is explanatory drawing of the manufacturing method of the rotor core which concerns on a prior art example. It is explanatory drawing of the use condition of the rotor core which concerns on a reference example. It is explanatory drawing of the use condition of the rotor core which concerns on a reference example.
- the rotor core 10 includes a plurality (two in the illustrated example) of substantially cylindrical core blocks 12 and 13 laminated. It is configured.
- Each of the core blocks 12 and 13 is formed by caulking and laminating a plurality of core pieces 11 formed by punching magnetic iron plates.
- the core block 13 located in the upper part of the core block 12 is rotated 180 degrees in the circumferential direction with respect to the core block 12 and laminated. Since the thickness of the metal plate used as the material of the core piece 11 formed by rolling varies, when the core blocks 12 and 13 are formed by laminating the core pieces 11, the thickness (dimension direction dimension) varies in the circumferential direction. May occur.
- the plurality of core blocks 12 and 13 are laminated in a state where they are rotated in the circumferential direction, and the thickness of the entire rotor core 10 is made uniform.
- the upper and lower core blocks 12 and 13 may be connected by welding or screwing as necessary (the same applies to the following embodiments).
- Each of the core blocks 12 and 13 is formed in a substantially cylindrical shape having a shaft hole 14 at the center.
- the axial direction of the cylindrical core blocks 12 and 13 is the vertical direction of the paper surface in FIGS.
- the inner peripheral surface of the shaft hole 14 is provided with ridges 18 and 19 that act as keys opposite to each other.
- the protrusions 18 and 19 can be used to facilitate positioning of the core pieces 11 in the circumferential direction.
- the protrusions 18 and 19 can be used to facilitate the circumferential positioning of the core blocks 12 and 13.
- the cross-sectional shape of the pair of magnet housing holes 16 and 17 is a rectangular cross section extending from the radially inner side to the radially outer side, and the distance between the pair of magnet housing holes 16 and 17 in the radial direction is narrower than the space on the radially outer side. .
- the pair of magnet housing holes 16 and 17 are line symmetric in the radial direction.
- the magnet housing holes 16 and 17 are formed across the core blocks 12 and 13, and are formed so as to penetrate the core blocks 12 and 13 in the present embodiment.
- the magnet accommodation holes 16 and 17 accommodate a plurality of magnet pieces 20 of the same length made of unmagnetized permanent magnets having a rectangular cross section in series.
- the cross-sectional area of the magnet accommodation holes 16 and 17 is larger than the cross-sectional area of the magnet piece 20 so that the magnet piece 20 can be accommodated with a gap.
- the kind of magnet should just be a permanent magnet, and a neodymium magnet with a big magnetic force can be used suitably.
- n 2.
- the height A of the core block 12 is set longer than the length of the magnet piece 20, and the height B of the core block 13 is set shorter than the length of the magnet piece 20.
- K is a thickness equal to or more than four sheets of the thickness (for example, 0.3 mm) of the iron core piece 11.
- the core blocks 12 and 13 have different thicknesses in the circumferential direction or the height of the magnet pieces varies. .
- the heights of the core blocks 12 and 13 are made different so that the direction position and the axial position of the magnet boundary surface 22 are separated by 1 mm or more.
- the core blocks 12 and 13 are stacked in a rotated state, and the magnet pieces 20 are accommodated in the magnet accommodation holes 16 and 17.
- the core blocks 12 and 13 are sandwiched between the lower mold and the upper mold, and the upper mold
- the resin melted by the plunger is poured into the magnet housing holes 16, 17 from the resin pot provided in, and further heated to cure the resin, and the plurality of magnet pieces 20 are fixed to the magnet housing holes 16, 17.
- the rotor core 25 is laminated in a state where the three core blocks 26, 27, and 28 are rotated 120 degrees each.
- a plurality (four in this embodiment) of magnet pieces 20 are accommodated in the magnet accommodation holes 16 and 17 provided so as to penetrate the three core blocks 26, 27, and 28, and are fixed with resin.
- the upper and lower contact positions of the core blocks 26, 27, and 28, that is, the axial positions of the core block boundary surfaces 30 and 30a are the magnet boundary surfaces 31 with which the upper and lower adjacent magnet pieces 20 abut. It differs from the axial position.
- the rotor core 25 has a core block 26, a core block 27, and a core block 28 stacked from the bottom to the top.
- the height A of the core block 26 is different from the heights of the other core blocks 27, 28.
- the axial direction of the core block boundary surfaces 30 and 30a where the core blocks 26, 27 and 28 abut each other and the magnet boundary surface 31 where the magnets 20 abut each other The position can be different.
- the heights A, B, and C of the core blocks 26, 27, and 28 are set to values that are not multiples of b.
- c represents a gap (usually greater than 0 and less than 1.2 mm) between the top of the magnet piece 20 and the top of the rotor core 25.
- the positions of the core block boundary surfaces 23, 30, and 30 a that serve as joints between the adjacent core blocks 12, 13, 26, 27, and 28 Since one magnet piece 20 exists so as to straddle the adjacent core blocks 12, 13, 26, 27 even if the adjacent core blocks 12, 13, 26, 27, 28 are not connected by welding or the like. , 28 can be firmly connected by a resin having the magnet piece 20 as a core material. Therefore, the occurrence of core cracks can be prevented, and the quality and reliability of the rotor core is improved.
- the present invention is not limited to the above embodiment, and the shape, dimensions, etc. of the iron core can be changed without changing the gist of the present invention.
- the core blocks in contact with each other can be firmly connected, and the occurrence of core cracks can be prevented, so that the quality and reliability of the rotor core is improved. Furthermore, when the lengths of the magnets used are the same, it is not necessary to prepare a plurality of types of magnets, and the assembly productivity of the rotor core is improved.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
(1) 互いに積層された略円筒形の複数のコアブロックと、
複数の磁石とを備えた回転子鉄心であって、
前記複数のコアブロックには軸方向に延びる複数の磁石収容孔が前記複数のコアブロックに跨って設けられ、
それぞれの前記磁石収容孔には複数の前記磁石が収容されて樹脂で固定されており、
複数の前記コアブロックが互いに当接するコアブロック境界面と、複数の前記磁石が互いに当接する磁石境界面との軸方向位置が異なることを特徴とする回転子鉄心。
前記磁石の長さをbとした場合、前記コアブロックの軸方向寸法がbの倍数でないことを特徴とする(1)の回転子鉄心。
(3) 少なくとも一つの前記コアブロックの軸方向寸法が他の前記コアブロックの軸方向寸法と異なることを特徴とする(1)または(2)の回転子鉄心。
(4) 前記コアブロック境界面の軸方向位置と前記磁石境界面の軸方向位置が1mm以上離間していることを特徴とする(1)または(2)の回転子鉄心。
(5) 互いに当接する前記コアブロックは周方向に180度回転した状態で積層されていることを特徴とする(1)または(2)の回転子鉄心。
なお、コアブロック12の上部に位置するコアブロック13は、コアブロック12に対して周方向に180度回転されて積層されている。圧延によって形成される鉄心片11の材料となる金属板の板厚にばらつきがあるため、鉄心片11を積層させてコアブロック12,13を形成すると、周方向に厚み(積層方向寸法)のばらつきが生じることがある。このため、複数のコアブロック12,13を周方向に回転させた状態で積層して回転子鉄心10全体としての厚みを均一にしている。
上下のコアブロック12,13は必要に応じて溶接又はねじ止めによって連結してもよい(以下の実施の形態においても同じ)。
軸孔14の内周面には対向してキーとして作用する突条18、19を備えている。複数の鉄心片11を積層する際に、例えばこの突条18、19を用いて鉄心片11の周方向の位置決めを容易にすることができる。また、コアブロック12,13を積層する際にも突条18、19を用いてコアブロック12,13の周方向の位置決めを容易にすることができる。
なお、本実施の形態ではn=2である。なお、図1では、理解を容易にするため、コアブロック12,13を離間して描き、両者の間に隙間gを設けて描いているが、実際はg=0である。
Claims (5)
- 互いに積層された略円筒形の複数のコアブロックと、
複数の磁石とを備えた回転子鉄心であって、
前記複数のコアブロックには軸方向に延びる複数の磁石収容孔が前記複数のコアブロックに跨って設けられ、
それぞれの前記磁石収容孔には複数の前記磁石が収容されて樹脂で固定されており、
複数の前記コアブロックが互いに当接するコアブロック境界面と、複数の前記磁石が互いに当接する磁石境界面との軸方向位置が異なることを特徴とする回転子鉄心。 - 複数の前記磁石の長さが同一であり、
前記磁石の長さをbとした場合、前記コアブロックの軸方向寸法がbの倍数でないことを特徴とする請求項1記載の回転子鉄心。 - 少なくとも一つの前記コアブロックの軸方向寸法が他の前記コアブロックの軸方向寸法と異なることを特徴とする請求項1または2に記載の回転子鉄心。
- 前記コアブロック境界面の軸方向位置と前記磁石境界面の軸方向位置が1mm以上離間していることを特徴とする請求項1または2に記載の回転子鉄心。
- 互いに当接する前記コアブロックは周方向に180度回転した状態で積層されていることを特徴とする請求項1または2に記載の回転子鉄心。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10791912.8A EP2448094B1 (en) | 2009-06-23 | 2010-04-28 | Rotator core |
KR1020117030165A KR101660074B1 (ko) | 2009-06-23 | 2010-04-28 | 회전자 철심 |
CN201080028107.7A CN102804561B (zh) | 2009-06-23 | 2010-04-28 | 转子铁芯 |
US13/377,938 US8922084B2 (en) | 2009-06-23 | 2010-04-28 | Rotor core |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009148920A JP5581013B2 (ja) | 2009-06-23 | 2009-06-23 | 回転子鉄心 |
JP2009-148920 | 2009-06-23 |
Publications (1)
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WO2010150592A1 true WO2010150592A1 (ja) | 2010-12-29 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2010/057557 WO2010150592A1 (ja) | 2009-06-23 | 2010-04-28 | 回転子鉄心 |
Country Status (6)
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US (1) | US8922084B2 (ja) |
EP (1) | EP2448094B1 (ja) |
JP (1) | JP5581013B2 (ja) |
KR (1) | KR101660074B1 (ja) |
CN (1) | CN102804561B (ja) |
WO (1) | WO2010150592A1 (ja) |
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2009
- 2009-06-23 JP JP2009148920A patent/JP5581013B2/ja active Active
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US20120091846A1 (en) | 2012-04-19 |
KR20120039543A (ko) | 2012-04-25 |
KR101660074B1 (ko) | 2016-09-30 |
EP2448094B1 (en) | 2020-07-15 |
EP2448094A1 (en) | 2012-05-02 |
EP2448094A4 (en) | 2017-06-28 |
US8922084B2 (en) | 2014-12-30 |
CN102804561B (zh) | 2014-11-05 |
JP5581013B2 (ja) | 2014-08-27 |
CN102804561A (zh) | 2012-11-28 |
JP2011010389A (ja) | 2011-01-13 |
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