JP6806209B1 - Rotating machine end plate structure - Google Patents

Rotating machine end plate structure Download PDF

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JP6806209B1
JP6806209B1 JP2019169933A JP2019169933A JP6806209B1 JP 6806209 B1 JP6806209 B1 JP 6806209B1 JP 2019169933 A JP2019169933 A JP 2019169933A JP 2019169933 A JP2019169933 A JP 2019169933A JP 6806209 B1 JP6806209 B1 JP 6806209B1
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outer peripheral
peripheral portion
end plate
rotating machine
rotor
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JP2021048704A (en
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拓也 倉澤
拓也 倉澤
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Meidensha Corp
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Meidensha Corp
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Priority to JP2019169933A priority Critical patent/JP6806209B1/en
Priority to PCT/JP2020/022938 priority patent/WO2021053901A1/en
Priority to CN202080065639.1A priority patent/CN114450869B/en
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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]
    • 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
    • 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
    • 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

Abstract

【課題】回転機のエンドプレートでの渦電流の発生を簡易な構造で抑制し、損失の減少を図る。【解決手段】回転機の一対のエンドプレートは、ロータ軸の軸方向両端部に配置され、コア部７を挟み込んでいる。このエンドプレートの内周部８ｃは厚肉状に形成されている一方、外周部８ｂは薄肉状に形成されている。具体的には外周部８ｂの肉厚Ｔは、導体材料と電流の角周波数から定まる表皮深さの二倍以下に形成されている。【選択図】図２PROBLEM TO BE SOLVED: To reduce the loss by suppressing the generation of an eddy current in an end plate of a rotating machine with a simple structure. A pair of end plates of a rotating machine are arranged at both ends in the axial direction of a rotor shaft, and sandwich a core portion 7. The inner peripheral portion 8c of the end plate is formed in a thick-walled shape, while the outer peripheral portion 8b is formed in a thin-walled shape. Specifically, the wall thickness T of the outer peripheral portion 8b is formed to be twice or less the skin depth determined by the angular frequency of the conductor material and the electric current. [Selection diagram] Fig. 2

Description

本発明は、回転機のロータに埋め込まれた磁石の飛散を防止するエンドプレートの構造に関する。 The present invention relates to the structure of an end plate that prevents the magnets embedded in the rotor of a rotating machine from scattering.

電動機などの回転機は、ハウジング内に固定されたステータ（固定子）と、ステータの内径側に所定の空隙をおいて対向配置されてロータ軸に固定されたロータ（回転子）とを備えている。 A rotating machine such as an electric motor includes a stator (stator) fixed in a housing and a rotor (rotor) arranged opposite to each other with a predetermined gap on the inner diameter side of the stator and fixed to a rotor shaft. There is.

図６に基づき概略を説明すれば、ロータ５は周方向の複数個所に永久磁石が設置されたコア部７と、コア部７を挟み込むように前記ロータ軸の外周面に固定されたエンドプレート２１とを備えている。 To explain the outline based on FIG. 6, the rotor 5 includes a core portion 7 in which permanent magnets are installed at a plurality of locations in the circumferential direction, and an end plate 21 fixed to the outer peripheral surface of the rotor shaft so as to sandwich the core portion 7. And have.

特開２００９−２３２５３５JP 2009-232535

ロータ５の軸方向の端部では、図７中の矢印Ｆに示すように、ロータ５・ステータ３間の磁束Ｂが軸方向に漏れ、エンドプレート２１を通過する。この漏洩磁束Ｆは、ステータ３のスロット形状の影響やコイル４を流れる電流に重畳する高調波電流に応じて変動するため、エンドプレート２１の外周部２１ａに渦電流が流れ、渦電流損が発生するおそれがある。 At the axial end of the rotor 5, as shown by the arrow F in FIG. 7, the magnetic flux B between the rotor 5 and the stator 3 leaks in the axial direction and passes through the end plate 21. Since the leakage magnetic flux F fluctuates according to the influence of the slot shape of the stator 3 and the harmonic current superimposed on the current flowing through the coil 4, an eddy current flows through the outer peripheral portion 21a of the end plate 21 and an eddy current loss occurs. There is a risk of

そこで、特許文献１のようにエンドプレート２１においてコア部１１ａとの対向面の外周寄りに環状凹部を形成し、さらに環状凹部の内側を空間部として寸法を規定することで渦電流を抑制する技術が提案されているが、構造が複雑なため、製造工程が増加しコストの抑制が図れないおそれある。 Therefore, as in Patent Document 1, a technique of forming an annular recess near the outer periphery of the surface facing the core portion 11a in the end plate 21 and further defining the dimensions with the inside of the annular recess as a space portion to suppress the eddy current. However, since the structure is complicated, the manufacturing process may increase and the cost may not be suppressed.

本発明は、このような従来の問題を解決するためになされ、回転機のエンドプレートの外周部における渦電流を簡単な構造で抑制することを解決課題としている。 The present invention has been made to solve such a conventional problem, and an object of the present invention is to suppress an eddy current at the outer peripheral portion of an end plate of a rotating machine with a simple structure.

（１）本発明は、回転機の回転子軸の軸方向両端部に配置され、
前記回転子軸の軸方向中間部の外周に設けられたロータのコア部を挟み込む一対のエンドプレートの構造であって、
前記各エンドプレートの内周部が厚肉状に形成されている一方、外周部が薄肉状に形成されていることを特徴としている。 (1) The present invention is arranged at both ends in the axial direction of the rotor shaft of the rotating machine.
It is a structure of a pair of end plates that sandwich the core portion of the rotor provided on the outer periphery of the axial intermediate portion of the rotor shaft.
The inner peripheral portion of each end plate is formed in a thick-walled shape, while the outer peripheral portion is formed in a thin-walled shape.

（２）本発明の一態様において、
前記コア部は、複数個所に磁石が周方向に配置されている一方、
前記外周部は、前記エンドプレートの外周縁から最外周の前記磁石に応じた位置までの範囲に形成されている。 (2) In one aspect of the present invention
In the core portion, magnets are arranged at a plurality of locations in the circumferential direction, while
The outer peripheral portion is formed in a range from the outer peripheral edge of the end plate to a position corresponding to the magnet on the outermost circumference.

（３）本発明の他の態様において、
前記コア部は、周方向の複数個所に形成された磁石収容孔と、該磁石収容孔に設置された永久磁石と、前記磁石収容孔に連続する磁気的空隙としてのフラックスバリアとを備える一方、
前記外周部は、前記エンドプレートの外周縁から前記フラックスバリアの外周部分に応じた位置の内周側までの範囲に形成されている。 (3) In another aspect of the present invention.
The core portion includes magnet accommodating holes formed at a plurality of locations in the circumferential direction, permanent magnets installed in the magnet accommodating holes, and a flux barrier as a magnetic gap continuous with the magnet accommodating holes.
The outer peripheral portion is formed in a range from the outer peripheral edge of the end plate to the inner peripheral side at a position corresponding to the outer peripheral portion of the flux barrier.

（４）本発明のさらに他の態様において、前記外周部の肉厚は、導体材料と電流の角周波数とから定まる表皮深さの二倍以下に形成されている。 (4) In still another aspect of the present invention, the wall thickness of the outer peripheral portion is formed to be twice or less the skin depth determined by the conductor material and the angular frequency of the electric current.

（５）本発明のさらに他の態様において、前記外周部の肉厚は、１ｍｍ〜２ｍｍの範囲内に設定されている。 (5) In still another aspect of the present invention, the wall thickness of the outer peripheral portion is set within the range of 1 mm to 2 mm.

本発明によれば、回転機のエンドプレートの外周部における渦電流を簡単な構造で抑制することが可能となる。 According to the present invention, it is possible to suppress the eddy current at the outer peripheral portion of the end plate of the rotating machine with a simple structure.

本発明の実施形態に係るエンドプレートが適用された回転機の縦断面図。The vertical sectional view of the rotating machine to which the end plate which concerns on embodiment of this invention is applied. 同 エンドプレートの外周部の拡大図。An enlarged view of the outer peripheral portion of the end plate. （ａ）は同エンドプレートの外周部の切落し部を示す拡大図、（ｂ）は同エンドプレートの円周方向の部分図、（ｃ）は（ｂ）のＱ部拡大図。(A) is an enlarged view showing a cut-off portion of the outer peripheral portion of the end plate, (b) is a partial view in the circumferential direction of the end plate, and (c) is an enlarged view of the Q portion of (b). （ａ）は導体の肉厚が厚い場合の渦電流を示す図、（ｂ）は同薄い場合の渦電流を示す図。(A) is a diagram showing an eddy current when the thickness of the conductor is thick, and (b) is a diagram showing an eddy current when the thickness of the conductor is the same. 損失削減率を示すグラフ。A graph showing the loss reduction rate. 従来のエンドプレートの外周部の拡大図。Enlarged view of the outer circumference of the conventional end plate. 同 漏洩磁束を示す拡大図。Enlarged view showing the same leakage magnetic flux.

以下、本発明の実施形態を説明する。ここで渦電流は、流れる経路を小さくすることで抑制可能なものの、従来のエンドプレートは外周部が厚く、損失（渦電流損）の抑制ができていない。 Hereinafter, embodiments of the present invention will be described. Here, the eddy current can be suppressed by reducing the flow path, but the conventional end plate has a thick outer peripheral portion, and the loss (eddy current loss) cannot be suppressed.

そこで、本実施形態では、軸方向の漏れ磁束の多いエンドプレートの外周部の肉厚を薄くすることで渦電流を抑制する一方、ロータのバランス修正などで使用する内周部の肉厚を厚い形状とした。 Therefore, in the present embodiment, the eddy current is suppressed by reducing the wall thickness of the outer peripheral portion of the end plate having a large amount of leakage flux in the axial direction, while the wall thickness of the inner peripheral portion used for correcting the balance of the rotor is increased. The shape was used.

まず、図１に基づき本実施形態に係る前記エンドプレートの適用された回転機を説明する。この回転機１は、車両などに搭載されて電動機や発電機として使用され、ハウジング２内に固定されたステータ３と、ステータ３と所定の空隙をおいて内径側に対向配置されたロータ５とを備え、ロータ５はロータ軸６に固定され、ステータ３に対して回転可能となっている。 First, a rotating machine to which the end plate according to the present embodiment is applied will be described with reference to FIG. The rotating machine 1 is mounted on a vehicle or the like and used as an electric motor or a generator, and has a stator 3 fixed in a housing 2 and a rotor 5 which is arranged to face the inner diameter side with a predetermined gap from the stator 3. The rotor 5 is fixed to the rotor shaft 6 and is rotatable with respect to the stator 3.

ロータ５は、ロータ軸６の軸方向中間部の外周に設けられた筒状のコア部７と、コア部７の両端部を挟み込むようにロータ軸６の外周面に固定された一対の前記エンドプレート８とを備えている。このコア部７は、磁性鋼板を積層して構成されたロータ鉄心９と、ロータ鉄心９の周方向の複数個所の形成された磁石収容孔１０（図３参照）内に配置された永久磁石１１と、磁石収容孔１０の両端部から連続形成された磁気的空隙としてのフラックスバリア１２とを備えている。 The rotor 5 includes a tubular core portion 7 provided on the outer periphery of the axially intermediate portion of the rotor shaft 6, and a pair of the ends fixed to the outer peripheral surface of the rotor shaft 6 so as to sandwich both ends of the core portion 7. It is provided with a plate 8. The core portion 7 is a rotor core 9 formed by laminating magnetic steel plates and a permanent magnet 11 arranged in magnet accommodating holes 10 (see FIG. 3) formed at a plurality of locations in the circumferential direction of the rotor core 9. And a flux barrier 12 as a magnetic gap continuously formed from both ends of the magnet accommodating hole 10.

なお、フラックスバリア１２は、磁石収容孔１０に連続する矩形状の空隙本体１２ａと、空隙本体１２ａから周方向に延設された外周部分１２ｂとを有し、ロータ外周との間にブリッジ幅Ｐが設けられている。 The flux barrier 12 has a rectangular gap body 12a continuous with the magnet accommodating hole 10 and an outer peripheral portion 12b extending in the circumferential direction from the gap body 12a, and has a bridge width P between the rotor outer circumference. Is provided.

≪エンドプレート８の構成≫
つぎに図１〜図３に基づき前記エンドプレート８の構成を説明する。具体的には前記エンドプレート８は、例えばアルミニウムや銅などの金属製の導電体（導体）により構成され、前述のようにコア部７を挟み込むことでコア部７の軸方向の変位を規制し、永久磁石１１の飛散を防止している。また、前記エンドプレート８は円盤状に形成され、中心部にロータ軸６を挿入する孔部８ａが形成され、孔部８ａにロータ軸６を挿入してコア部７を挟み込むように外嵌されている。 << Configuration of end plate 8 >>
Next, the configuration of the end plate 8 will be described with reference to FIGS. 1 to 3. Specifically, the end plate 8 is made of a metal conductor (conductor) such as aluminum or copper, and the axial displacement of the core portion 7 is regulated by sandwiching the core portion 7 as described above. , The permanent magnet 11 is prevented from scattering. Further, the end plate 8 is formed in a disk shape, a hole 8a for inserting the rotor shaft 6 is formed in the central portion, and the rotor shaft 6 is inserted into the hole 8a and fitted so as to sandwich the core portion 7. ing.

前記エンドプレート８などの導体を流れる交流電流は、導体の表面で電流密度Ｊが高く、表面から離れると電流密度Ｊが低くなる（表皮効果）。この表皮効果は、特に周波数が高くなるほど顕著となり、電流が表面に集中する。このとき導体の電流密度Ｊは、深さ「σ」に対して式（１）に示すように減少する。 The alternating current flowing through a conductor such as the end plate 8 has a high current density J on the surface of the conductor, and the current density J decreases as the distance from the surface increases (skin effect). This skin effect becomes more remarkable as the frequency becomes higher, and the current concentrates on the surface. At this time, the current density J of the conductor decreases with respect to the depth “σ” as shown in the equation (1).

Figure 0006806209
Figure 0006806209

式（１）中の「ｄ」は表皮深さを示し、これは電流が表面電流の「１／ｅ（約３７％）」になる深さを表し、導体内を流れる電流の多くは表皮深さ内を流れる。この表皮深さ「ｄ」は、前記エンドプレート８を構成する導体の材質（材料）と電流の角周波数から定まり、式（２）のように計算される。 “D” in the equation (1) indicates the skin depth, which represents the depth at which the current becomes “1 / e (about 37%)” of the surface current, and most of the current flowing in the conductor is the skin depth. It flows through the inside. The skin depth "d" is determined from the material (material) of the conductor constituting the end plate 8 and the angular frequency of the electric current, and is calculated as in the equation (2).

Figure 0006806209
Figure 0006806209

そこで、図２に示すように、前記エンドプレート８の外周部８ｂの肉厚Ｔを、その表皮深さ「ｄ」の二倍以下に形成することで渦電流を抑制し、損失の大幅な減少を図っている。このとき外周部８ｂの肉厚Ｔの下限値は、外周部８ｂの剛性などの諸事情を考慮して定めればよい。 Therefore, as shown in FIG. 2, the eddy current is suppressed by forming the wall thickness T of the outer peripheral portion 8b of the end plate 8 to be twice or less the skin depth "d", and the loss is significantly reduced. I am trying to. At this time, the lower limit value of the wall thickness T of the outer peripheral portion 8b may be determined in consideration of various circumstances such as the rigidity of the outer peripheral portion 8b.

例えばアルミ製の前記エンドプレート８であれば、キャリア周波数「５ｋＨｚ」以上の場合、外周部８ｂの肉厚Ｔを「１ｍｍ〜２ｍｍ」の範囲に形成することが好ましい。なお、前記エンドプレート８の外周部８ｂを除く部分（内周部８ｃ）は、従来通りの厚肉状としてもよいものとする。 For example, in the case of the end plate 8 made of aluminum, when the carrier frequency is "5 kHz" or higher, it is preferable to form the wall thickness T of the outer peripheral portion 8b in the range of "1 mm to 2 mm". The portion (inner peripheral portion 8c) excluding the outer peripheral portion 8b of the end plate 8 may have a thick wall shape as in the conventional case.

図３に基づき外周部８ｂの具体的位置を説明する。図３（ａ）中のＣは、外周部８ｂの境界となる切落し部を示し、前記エンドプレート８の外周縁８ｄから切落し部Ｃまでの範囲が外周部８ｂとして薄肉状に形成されている。 The specific position of the outer peripheral portion 8b will be described with reference to FIG. C in FIG. 3A shows a cut-off portion that is a boundary of the outer peripheral portion 8b, and the range from the outer peripheral edge 8d of the end plate 8 to the cut-off portion C is formed as a thin wall as the outer peripheral portion 8b. There is.

この切落し部Ｃは、図３（ｃ）中の矢印Ｒに示すように、フラックスバリア１２の外周部分１２ｂに応じた位置の内周側（内径側）に形成されている。このときフラックスバリア１２は磁石収容孔１０に連続するため、外周部８ｂは前記エンドプレート８の外周縁８ｄから最外周の永久磁石１１に応じた位置までの範囲に形成されているといえる。 As shown by the arrow R in FIG. 3C, the cut-off portion C is formed on the inner peripheral side (inner diameter side) at a position corresponding to the outer peripheral portion 12b of the flux barrier 12. At this time, since the flux barrier 12 is continuous with the magnet accommodating hole 10, it can be said that the outer peripheral portion 8b is formed in a range from the outer peripheral edge 8d of the end plate 8 to the position corresponding to the outermost permanent magnet 11.

≪作用効果≫
図４および図５に基づき前記エンドプレート８による作用効果を説明する。図４（ａ）中の矢印Ｉ1〜Ｉ4は、導体の肉厚が厚い場合（従来のエンドプレート２１の外周部２１ａなど）の渦電流を示し、導体を流れる渦電流Ｉ1〜Ｉ4の大部分が表皮深さの部分を流れている。 ≪Action effect≫
The action and effect of the end plate 8 will be described with reference to FIGS. 4 and 5. Arrows I 1 to I 4 in FIG. 4 (a) indicate eddy currents when the conductor is thick (such as the outer peripheral portion 21 a of the conventional end plate 21), and eddy currents I 1 to I 4 flowing through the conductor. Most of it flows through the depth of the epidermis.

そこで前記エンドプレート８の外周部８ｂの肉厚Ｔを、前述のように表皮深さの二倍以下に形成した。この構成によれば、図４（ｂ）に示すように、導体の上面を流れる電流Ｉ1と下面を流れる電流Ｉ3とが互いに打ち消しあうため、外周部８ｂの導体を流れる渦電流Ｉ1〜Ｉ4が抑制され、損失（渦電流損）を大幅に減少させることが可能となる。 Therefore, the wall thickness T of the outer peripheral portion 8b of the end plate 8 is formed to be twice or less the skin depth as described above. According to this configuration, as shown in FIG. 4B, the current I 1 flowing on the upper surface of the conductor and the current I 3 flowing on the lower surface cancel each other out, so that the eddy currents I 1 to flow in the conductor of the outer peripheral portion 8b I 4 is suppressed, and the loss (eddy current loss) can be significantly reduced.

その結果、特許文献１のように複雑な構造を採用する必要が無く、エンドプレート８の外周部８ｂにおける渦電流を簡単（シンプル）な構造で抑制でき、この点で製造工程が簡素化でき、またコストの抑制を図ることもできる。 As a result, it is not necessary to adopt a complicated structure as in Patent Document 1, and the eddy current in the outer peripheral portion 8b of the end plate 8 can be suppressed by a simple structure, and in this respect, the manufacturing process can be simplified. It is also possible to control costs.

このような前記エンドプレート８の作用効果は、図５の比較結果にも示されている。すなわち、図５の比較結果によれば、従来のエンドプレート２１の損失比率を「１００％」とした場合、前記エンドプレート８の損失比率は「２５％」削減されている。この点で前記エンドプレート８の作用効果が確認されている。 Such an action and effect of the end plate 8 is also shown in the comparison result of FIG. That is, according to the comparison result of FIG. 5, when the loss ratio of the conventional end plate 21 is set to "100%", the loss ratio of the end plate 8 is reduced by "25%". At this point, the action and effect of the end plate 8 have been confirmed.

なお、本発明は、上記実施形態に限定されるものではなく、各請求項に記載刺された範囲内で変形して実施することができる。例えば前記エンドプレート８の外周部８ｂの肉厚Ｔを表皮深さの二倍以下に形成した場合に限らず、軸方向の漏れ磁束の多い外周部８ｂの肉厚Ｔを薄肉状するだけでも渦電流抑制による効果を得ることができる。 The present invention is not limited to the above embodiment, and can be modified and implemented within the range described in each claim. For example, not only when the wall thickness T of the outer peripheral portion 8b of the end plate 8 is formed to be twice or less the skin depth, but also when the wall thickness T of the outer peripheral portion 8b having a large axial leakage flux is made thin, an eddy current is formed. The effect of current suppression can be obtained.

１…回転機
２…ハウジング
３…ステータ
４…コイル
５…ロータ
６…ロータ軸
７…コア部
８…エンドプレート
８ａ…中心孔
８ｂ…外周部
８ｃ…内周部
８ｄ…外周縁
１０…磁石収容孔
１１…永久磁石
１２…フラックスバリア
１２ａ…空隙本体
１２ｂ…外周部分
１３…コア部の外周縁 1 ... Rotating machine 2 ... Housing 3 ... Stator 4 ... Coil 5 ... Rotor 6 ... Rotor shaft 7 ... Core part 8 ... End plate 8a ... Center hole 8b ... Outer part 8c ... Inner peripheral part 8d ... Outer peripheral edge 10 ... Magnet accommodating hole 11 ... Permanent magnet 12 ... Flux barrier 12a ... Void body 12b ... Outer peripheral part 13 ... Outer peripheral edge of core part

Claims (3)

回転機の回転子軸の軸方向両端部に配置され、
前記回転子軸の軸方向中間部の外周に設けられたロータのコア部を挟み込む一対のエンドプレートの構造であって、
前記各エンドプレートの内周部が厚肉状に形成されている一方、外周部が薄肉状に形成され、
前記コア部は、周方向の複数個所に形成された磁石収容孔と、該磁石収容孔に設置された磁石と、前記磁石収容孔から外周方向に連続した磁気的空隙としてのフラックスバリアとを備え、
前記内周部と前記外周部との境界は、前記フラックスバリアの外周部分に応じた位置に形成され、
前記外周部は、前記エンドプレートの外周縁から前記境界までの範囲に形成されている
ことを特徴とする回転機のエンドプレートの構造。 Arranged at both ends of the rotor shaft of the rotor in the axial direction,
It is a structure of a pair of end plates that sandwich the core portion of the rotor provided on the outer periphery of the axial intermediate portion of the rotor shaft.
The inner peripheral portion of each end plate is formed to have a thick wall shape, while the outer peripheral portion is formed to have a thin wall shape.
The core portion includes magnet accommodating holes formed at a plurality of locations in the circumferential direction, magnets installed in the magnet accommodating holes, and a flux barrier as a magnetic void continuous from the magnet accommodating holes in the outer peripheral direction. ,
The boundary between the inner peripheral portion and the outer peripheral portion is formed at a position corresponding to the outer peripheral portion of the flux barrier.
The structure of the end plate of a rotating machine, wherein the outer peripheral portion is formed in a range from the outer peripheral edge of the end plate to the boundary . 前記外周部の肉厚は、導体材料と電流の角周波数とから定まる表皮深さの二倍以下に形成され、
前記外周部の上下面を流れる電流が互いに打ち消しあうことを特徴とする請求項１に記載された回転機のエンドプレートの構造。 The wall thickness of the outer peripheral portion is formed to be less than twice the skin depth determined by the conductor material and the angular frequency of the electric current.
The structure of an end plate of a rotating machine according to claim 1, wherein the currents flowing on the upper and lower surfaces of the outer peripheral portion cancel each other out . 前記外周部の肉厚は、１ｍｍ〜２ｍｍの範囲内に設定されていることを特徴とする請求項１または２に記載された回転機のエンドプレートの構造。 The structure of the end plate of the rotary machine according to claim 1 or 2 , wherein the wall thickness of the outer peripheral portion is set within the range of 1 mm to 2 mm.
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