WO2015118682A1 - 回転子 - Google Patents
回転子 Download PDFInfo
- Publication number
- WO2015118682A1 WO2015118682A1 PCT/JP2014/053017 JP2014053017W WO2015118682A1 WO 2015118682 A1 WO2015118682 A1 WO 2015118682A1 JP 2014053017 W JP2014053017 W JP 2014053017W WO 2015118682 A1 WO2015118682 A1 WO 2015118682A1
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- WIPO (PCT)
- Prior art keywords
- rotor
- protrusions
- magnetic poles
- protrusion
- rotor according
- Prior art date
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Classifications
-
- 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
- H02K1/278—Surface mounted magnets; Inset magnets
-
- 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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/06—Magnetic cores, or permanent magnets characterised by their skew
-
- 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 relates to a rotor of a rotating electrical machine.
- Some rotors of rotating electrical machines have a non-magnetic ring for holding a permanent magnet mounted around the rotor.
- Patent Document 1 discloses a rotor including at least a rotor core, a plurality of magnets, and a nonmagnetic ring.
- the plurality of magnets are fixed to the outer periphery of the rotor core side by side in the circumferential direction, and the nonmagnetic ring is provided so as to surround the plurality of magnets from the outside.
- Patent Document 2 discloses a configuration in which the rotor is a step skew that is shifted by a predetermined angle in the circumferential direction between the upper and lower steps in order to reduce cogging torque and torque ripple.
- the present invention has been made in view of the above, and provides a rotor of a rotating electrical machine that can avoid an increase in the amount of distortion of a nonmagnetic ring around a step skew boundary and can avoid buckling and breakage. With the goal.
- the present invention provides a rotor having a plurality of magnetic poles and having a stage skew structure of two or more stages, and the rotor core of the rotor includes a plurality of rotor cores at least on the stage skew boundary side. And a cylindrical nonmagnetic ring mounted on the outer periphery of the plurality of magnetic poles so as to cover the step skew boundary, and the nonmagnetic ring has a plurality of inner diameter bulging portions.
- each of the plurality of magnetic poles and each of the plurality of protrusions are in contact with the corresponding inner diameter bulging portion.
- FIG. 1 It is a perspective view of the rotor (before a nonmagnetic ring attachment) of the rotary electric machine of Embodiment 1 of this invention. It is a top view of the rotor (before nonmagnetic ring mounting
- FIG. 6 is a perspective view of a quadrangular core at a step skew angle of 10 °. It is a figure which shows a square-shaped core and a nonmagnetic ring in step skew angle 10 degrees. It is a perspective view of the rotor (before nonmagnetic ring attachment) of the rotary electric machine of Embodiment 2 of this invention. It is a top view of the rotor of the rotary electric machine by Embodiment 2 of this invention.
- FIG. 1 and 2 are a perspective view and a plan view, respectively, of the rotor of the rotating electric machine according to the first embodiment before the nonmagnetic ring is mounted.
- FIG. 3 is a perspective view of the rotor of the rotating electrical machine according to the first embodiment.
- FIG. 4 is a top view of the rotor of the rotating electrical machine according to the first embodiment, and
- FIG. 5 is an enlarged view of a portion V in FIG.
- the rotor 1 includes a rotor first step portion 2 and a rotor second step portion 3.
- the rotor first step 2 and the rotor second step 3 are arranged in the direction in which the rotor shaft 4 extends. Further, the rotor first step portion 2 and the rotor second step portion 3 are configured in the same manner except that they are shifted by a step skew angle of 10 ° in the circumferential direction (rotation direction).
- the rotor first step portion 2 includes a rotor core 21 and a plurality of permanent magnets (magnetic poles) 22.
- the rotor core 21 is configured by laminating a plurality of electromagnetic steel plates (made of a magnetic material) provided with a plurality of projections 211 arranged at equal intervals in the circumferential direction.
- the plurality of permanent magnets 22 are affixed between a pair of corresponding protrusions 211 and are disposed in non-contact with the pair of protrusions 211.
- the rotor second stage 3 is also configured in the same manner as the rotor first stage 2 and includes a rotor core 31 and a plurality of permanent magnets (magnetic poles) 32.
- the rotor core 31 is configured by laminating a plurality of electromagnetic steel plates (made of a magnetic material) provided with a plurality of protrusions 311 arranged at equal intervals in the circumferential direction.
- the plurality of permanent magnets 32 are affixed between a pair of corresponding protrusions 311 and are disposed in non-contact with the pair of protrusions 311.
- the plurality of permanent magnets and the plurality of protrusions are arranged at an equiangular pitch in the circumferential direction.
- the number of stages is 2 and the number of magnetic poles is 8. Therefore, eight permanent magnets 22 and 32 and eight protrusions 211 and 311 are provided in each of the rotor first step portion 2 and the rotor second step portion 3.
- the rotor core of the present invention includes a plurality of protrusions at least on the boundary 6 side.
- the protrusions 211 and 311 are respectively the corresponding rotor first step portion 2 or rotor.
- the second step portion 3 extends continuously over the entire length in the rotation axis direction.
- each of the permanent magnets 22 and 32 extends continuously over the entire length of the corresponding rotor first step portion 2 or rotor second step portion 3 in the rotation axis direction, and each of the protrusions 211 and 311
- the length (the length in the rotation axis direction) is the same as the length of the permanent magnets 22 and 32 (the length in the rotation axis direction).
- the outer peripheral surfaces of the protrusions 211 and 311 are formed so as to form an arc shape that is curved in a direction in which the protrusion swells radially outward in a plan view.
- each of the rotor first step 2 and the rotor second step 3 the outermost portions of the protrusions 211 and 311 of the rotor cores 21 and 31 from the axis of the rotor shaft 4 (rotation center of the rotor).
- the radial distance from the center of the rotor shaft 4 (rotation center of the rotor) to the outermost part of the magnetic poles (permanent magnets 22 and 32) is L1
- the radius of curvature of the protrusions 211 and 311 is R1.
- the rotor 1 includes a nonmagnetic ring 5.
- the nonmagnetic ring 5 is a cylindrical member made of a nonmagnetic material (for example, stainless steel) and having a substantially regular hexagonal shape in plan view (as viewed along the direction in which the rotor shaft 4 extends).
- the nonmagnetic ring 5 includes the outer circumferences of the eight permanent magnets 22 and 32 of the rotor first stage 2 and the rotor second stage 3, the rotor first stage 2 and the rotor second stage 3, respectively.
- the outer periphery of each of the eight protrusions 211 and 311 and the outer periphery of the boundary 6 between the rotor first step portion 2 and the rotor second step portion 3 are mounted so as to cover them.
- the nonmagnetic ring 5 includes 16 arc-shaped inner diameter bulging portions 51 which are the sum of the number of magnetic poles and the number of protrusions of the rotor core.
- the outer shape (outer diameter) of the nonmagnetic ring 5 has a substantially regular hexagonal loop-like contour in which the plurality of inner diameter bulging portions 51 are connected as gentle ridge lines.
- the nonmagnetic ring 5 has an inner peripheral surface (inner diameter side surface) of the inner diameter bulging portion 51, each of a plurality of magnetic poles (permanent magnets 22, 32), and each outer peripheral surface of a plurality of protrusions of the rotor core.
- the urging force is applied to the magnetic poles toward the inside in the radial direction.
- the circumference L3 of the virtual circumscribed circle is L4 and the inner circumference of the nonmagnetic ring 5 is L4, the circumference L3 of the virtual circumscribed circle>
- the nonmagnetic ring 5 is configured to have the inner peripheral length L4 of the nonmagnetic ring.
- the protrusions of the rotor core protrude outward in the radial direction from a common tangent line C that contacts a pair of magnetic poles on both sides of the protrusion.
- FIG. 6 is a graph showing the amount of distortion generated in each polygonal nonmagnetic ring when the step skew angle is 5, 8, and 10 °.
- the strain amount ⁇ of the nonmagnetic ring is set to L5 as the circumferential length of the rotor core other than the stage skew boundary, and When the length is L6, it is expressed by the following equation (2).
- ⁇ (L6 ⁇ L5) / L5 ⁇ 100 (2)
- the circumferential lengths L5 and L6 are respectively expressed by the following formulas (3) and (4) where a half of the diagonal length is a, the diagonal angle is ⁇ m, and the step skew angle ⁇ ′. ).
- L5 m ⁇ a ⁇ ⁇ 2 ⁇ (1-cos ⁇ m) ⁇ ⁇ (1/2)
- L6 m ⁇ a ⁇ ⁇ 2 ⁇ (1-cos ⁇ ′) ⁇ ⁇ (1/2) + m ⁇ a ⁇ ⁇ 2 ⁇ (1-cos ( ⁇ m ⁇ ′)) ⁇ ⁇ (1/2).
- the step skew angle is 10 °
- the amount of strain generated in the nonmagnetic ring is about 0.5%.
- Embodiment 1 which has a protrusion in a rotor core, compared with the case where there is no protrusion in a rotor core, the distortion amount which generate
- a projection is provided between the magnets of the rotor core, and a nonmagnetic ring is disposed on the projection, so that both the magnet and the projection of the rotor core are nonmagnetic. Since it is made to contact
- the non-magnetic ring near the step skew boundary associated with the step skew is not accompanied by an increase in the number of parts and an increase in the distance between the magnet and the stator.
- An increase in the amount of strain of the magnetic ring can be avoided, and buckling and breakage can be avoided.
- FIG. 9 is a perspective view of the rotor (before the nonmagnetic ring is mounted) of the rotating electrical machine according to the second embodiment of the present invention.
- FIG. 10 is a plan view of the rotor of the rotating electrical machine according to the second embodiment of the present invention.
- the second embodiment is the same as the first embodiment except for the parts described below.
- the second embodiment is characterized in that the protrusion is provided partially (at least on the boundary side) over the rotation axis direction of the rotor.
- 9 to 10 show an example of the feature of the second embodiment.
- the rotor 7 of the second embodiment includes a rotor first step portion 8 and a rotor second step portion 9 as in the first embodiment.
- the rotor first step 8 and the rotor second step 9 are arranged in the direction in which the rotor shaft 4 extends. Further, the rotor first step portion 8 and the rotor second step portion 9 are configured similarly except that they are shifted by a step skew angle of 10 ° in the circumferential direction (rotation direction).
- the rotor first step portion 8 includes a rotor iron core and a plurality of permanent magnets 822, but the rotor iron core of the rotor first step portion 8 does not include a protrusion. And the rotor core portion 81 formed of a nonmagnetic material having a protrusion 811.
- the rotor second step portion 9 also includes a rotor core and a plurality of permanent magnets 822, and the rotor core of the rotor second step portion 9 also includes an electromagnetic steel sheet (from a magnetic material) that does not include protrusions. And the rotor core portion 81 formed of a nonmagnetic material having a protrusion 811.
- the rotor core portion 81 of the rotor first step portion 8 and the rotor core portion 81 of the rotor second step portion 9 are on the boundary 10 side of the rotor first step portion 8 and the rotor second step portion 9. Located in the area. That is, the protrusion 811 of the rotor first step portion 8 and the protrusion 811 of the rotor second step portion 9 are provided only on the boundary 10 side of the rotor first step portion 8 and the rotor second step portion 9. ing.
- the side surface of the permanent magnet 822 of the rotor first step portion 8 is in contact with the side surface of the protrusion 811, and the side surface of the permanent magnet 832 of the rotor second step portion 9 is also the side surface of the protrusion 811. In contact with.
- the amount of distortion generated in the nonmagnetic ring around the step skew boundary can be reduced for the same reason as in the first embodiment, and the permanent magnet can be used as the protrusion of the rotor core.
- the position of the permanent magnet in the circumferential direction can be reliably controlled by making it contact with the rotor, and the rotor core part with protrusions is made of a non-magnetic material to avoid torque reduction due to magnetic flux leakage from the permanent magnet can do.
Abstract
Description
図1および図2はそれぞれ、非磁性リング装着前の本実施の形態1の回転電機の回転子の斜視図および平面図である。図3は、本実施の形態1の回転電機の回転子の斜視図である。図4は、本実施の形態1の回転電機の回転子の上面図であり、図5は、図4のV部の拡大図である。
θ=360°/2n・・・(1)
となる。
γ=(L6-L5)/L5×100・・・(2)
また周長L5、L6はそれぞれ、m角形において、対角線の長さの半分をaとし、対角線のなす角度をθmとし、段スキュー角θ’とした場合、次の式(3)、式(4)であらわされる。
L5=m×a×{2×(1-cosθm)}^(1/2)・・・(3)
L6=m×a×{2×(1-cosθ’)}^(1/2)+m×a×{2×(1-cos(θm-θ’))}^(1/2)・・・(4)
γ={(1-cosθ’)^(1/2)+(1-cos(θm-θ’))^(1/2)}/{(1-cosθm)^(1/2)}・・・(5)
非磁性リングに発生する歪量は0.5%程度となる。これに対し、同じ段スキュー角10°であって、回転子鉄心に突起が無くつまり非磁性リングの変形形状8角形の場合の構成では、すなわち、m=8、θm=45°、θ’=10°の構成では、非磁性リングに発生する歪量は1.4%程度である。よって、回転子鉄心に突起を有する本実施の形態1では、回転子鉄心に突起が無い場合に比べて、非磁性リングに発生する歪量を、60%程度も低減することができる。
次に、図9および図10に基づいて、本発明の実施の形態2ついて説明する。図9は、本発明の実施の形態2の回転電機の回転子(非磁性リング装着前)の斜視図である。図10は、本発明の実施の形態2による回転電機の回転子の平面図である。なお、本実施の形態2は、以下に説明する部分を除いては、上記実施の形態1と同様であるものとする。
Claims (9)
- 複数の磁極を有し且つ2段以上の段スキュー構造を有する回転子であって、
前記回転子の回転子鉄心は、少なくとも段スキュー境界側に複数の突起を備えるとともに、前記複数の磁極の外周に、前記段スキュー境界を覆うように装着された筒状の非磁性リングを備え、
前記非磁性リングは、複数の内径膨出部を有しており、
前記複数の磁極のそれぞれと前記複数の突起のそれぞれとが、対応する前記内径膨出部と当接している、
回転子。 - 前記回転子鉄心の前記突起は、その突起の両隣にある一対の前記磁極に接する共通の接線よりも径方向外側に突出している、
請求項1の回転子。 - 前記回転子の回転中心から前記突起の最外部までの径方向距離をL1とし、前記回転子の回転中心から前記磁極の最外部までの径方向距離をL2としたとき、
距離L1≦距離L2である、
請求項1または2の回転子。 - 前記突起のそれぞれの長さは、前記磁極の長さと同じである、
請求項1~3の何れか一項の回転子。 - 前記突起は、前記段スキュー境界側にだけ設けられている、
請求項1~3の何れか一項の回転子。 - 前記突起のそれぞれの外周面は、平面視、径方向外側に膨らむ向きに湾曲した円弧状をなすように形成されている、
請求項1~5の何れか一項の回転子。 - 前記突起を有する回転子鉄心は磁性材料からなり、前記突起は、隣接する一対の前記磁極と非接触である、
請求項1~6の何れか一項の回転子。 - 前記突起を有する回転子鉄心部分は非磁性材料からなり、前記突起は、隣接する一対の前記磁極と接触している、
請求項1~6の何れか一項の回転子。 - 前記複数の永久磁石と、前記複数の突起とは、周方向に等角ピッチで配置されている、
請求項1~8の何れか一項の回転子。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US15/108,357 US10439459B2 (en) | 2014-02-10 | 2014-02-10 | Rotor |
PCT/JP2014/053017 WO2015118682A1 (ja) | 2014-02-10 | 2014-02-10 | 回転子 |
CN201480075172.3A CN105981263B (zh) | 2014-02-10 | 2014-02-10 | 转子 |
EP14881481.7A EP3107191B1 (en) | 2014-02-10 | 2014-02-10 | Rotor |
JP2015561134A JP6121002B2 (ja) | 2014-02-10 | 2014-02-10 | 回転子 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2014/053017 WO2015118682A1 (ja) | 2014-02-10 | 2014-02-10 | 回転子 |
Publications (1)
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WO2015118682A1 true WO2015118682A1 (ja) | 2015-08-13 |
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ID=53777508
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PCT/JP2014/053017 WO2015118682A1 (ja) | 2014-02-10 | 2014-02-10 | 回転子 |
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US (1) | US10439459B2 (ja) |
EP (1) | EP3107191B1 (ja) |
JP (1) | JP6121002B2 (ja) |
CN (1) | CN105981263B (ja) |
WO (1) | WO2015118682A1 (ja) |
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JP2019041476A (ja) * | 2017-08-24 | 2019-03-14 | ファナック株式会社 | 回転子及び回転電機 |
WO2019064747A1 (ja) * | 2017-09-27 | 2019-04-04 | 日本電産株式会社 | ロータ及びそのロータを備えたモータ |
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- 2014-02-10 WO PCT/JP2014/053017 patent/WO2015118682A1/ja active Application Filing
- 2014-02-10 EP EP14881481.7A patent/EP3107191B1/en active Active
- 2014-02-10 JP JP2015561134A patent/JP6121002B2/ja not_active Expired - Fee Related
- 2014-02-10 CN CN201480075172.3A patent/CN105981263B/zh active Active
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Cited By (4)
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---|---|---|---|---|
CN108023416A (zh) * | 2016-10-28 | 2018-05-11 | 财团法人工业技术研究院 | 永磁式转子与永磁式转动构件 |
JP2019041476A (ja) * | 2017-08-24 | 2019-03-14 | ファナック株式会社 | 回転子及び回転電機 |
US10707711B2 (en) | 2017-08-24 | 2020-07-07 | Fanuc Corporation | Rotor and rotating electrical machine |
WO2019064747A1 (ja) * | 2017-09-27 | 2019-04-04 | 日本電産株式会社 | ロータ及びそのロータを備えたモータ |
Also Published As
Publication number | Publication date |
---|---|
EP3107191A4 (en) | 2017-09-20 |
US10439459B2 (en) | 2019-10-08 |
US20160322873A1 (en) | 2016-11-03 |
JPWO2015118682A1 (ja) | 2017-03-23 |
CN105981263A (zh) | 2016-09-28 |
CN105981263B (zh) | 2019-01-08 |
EP3107191B1 (en) | 2020-06-10 |
EP3107191A1 (en) | 2016-12-21 |
JP6121002B2 (ja) | 2017-04-26 |
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