JP6828635B2 - Rotating machine rotor - Google Patents

Rotating machine rotor Download PDF

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JP6828635B2
JP6828635B2 JP2017153968A JP2017153968A JP6828635B2 JP 6828635 B2 JP6828635 B2 JP 6828635B2 JP 2017153968 A JP2017153968 A JP 2017153968A JP 2017153968 A JP2017153968 A JP 2017153968A JP 6828635 B2 JP6828635 B2 JP 6828635B2
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gap
rotor
magnet
rotor core
permanent magnet
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JP2019033612A (en
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卓 雁木
卓 雁木
服部　宏之
宏之 服部
新也 佐野
新也 佐野
泰秀 柳生
泰秀 柳生
貴憲 門田
貴憲 門田
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Toyota Motor Corp
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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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Description

本発明は、回転電機のロータ、特にロータコアに永久磁石が埋め込まれたロータの構造に関する。 The present invention relates to the structure of a rotor of a rotary electric machine, particularly a rotor in which a permanent magnet is embedded in a rotor core.

電磁鋼板を複数枚積層させて形成され、永久磁石が埋め込まれるロータコアを含んで構成されるロータが知られている。ロータと、ロータの外周側に配置されるステータとを含んでなる回転電機は、たとえば電気自動車やハイブリッド自動車などの電動車両において駆動用の電動機（モータ）や電力回生用の発電機（ジェネレータ）として用いられている。 A rotor formed by laminating a plurality of electromagnetic steel sheets and including a rotor core in which a permanent magnet is embedded is known. A rotary electric machine including a rotor and a stator arranged on the outer peripheral side of the rotor is used as a drive electric motor (motor) or a power regeneration generator (generator) in an electric vehicle such as an electric vehicle or a hybrid vehicle. It is used.

特許文献１には、ロータコアの円環の外周部に複数の磁石収容孔が設けられ、磁石収容孔の各々に直方体の永久磁石が収容される回転電機のロータが開示されている。磁石収容孔は、隣接する２個が対をなし、径方向外側へＶ字形に広がるように配置されてロータ極を形成している。 Patent Document 1 discloses a rotor of a rotary electric machine in which a plurality of magnet accommodating holes are provided on the outer peripheral portion of an annulus of a rotor core, and a rectangular parallelepiped permanent magnet is accommodated in each of the magnet accommodating holes. Two adjacent magnet accommodating holes form a pair and are arranged so as to spread outward in the radial direction in a V shape to form a rotor pole.

特開２０１６−４６９４９号公報Japanese Unexamined Patent Publication No. 2016-469949

径方向外側へＶ字形に広がるように配置された一対の永久磁石を、外周部に複数極備えたロータにおいて、ロータの外周側に配置されたステータからの磁束が永久磁石に直撃し、永久磁石の反磁界強度が高くなり、永久磁石が減磁してしまう虞がある。 In a rotor equipped with a pair of permanent magnets arranged so as to spread outward in a radial direction in a V shape on the outer peripheral portion, magnetic flux from a stator arranged on the outer peripheral side of the rotor directly hits the permanent magnets, and the permanent magnets. There is a risk that the permanent magnet will be demagnetized due to the increased demagnetic field strength.

本発明の目的は、ステータからの磁束が永久磁石に直撃することを抑制して、永久磁石の減磁を抑制することにある。 An object of the present invention is to suppress the magnetic flux from the stator from directly hitting the permanent magnet and suppress the demagnetization of the permanent magnet.

本発明の回転電機のロータは、それぞれ永久磁石を収容し、径方向外側へＶ字形に広がるように配置された一対の磁石収容孔を、外周部に複数極備えるロータコアを有する回転電機のロータであって、前記各磁石収容孔は、前記永久磁石を収容した状態で、内周端に間隙が設けられ、前記間隙の前記ロータコアの径方向外側の縁には、前記間隙の内側に突出し、前記永久磁石と接しない突起が設けられており、前記間隙の前記ロータコアの径方向外側の縁には、前記永久磁石の角から離れるように湾曲した湾曲部が設けられており、前記間隙の前記一対の磁石収容孔のうちの他方側の縁には、前記ロータコアの径方向に延びる延伸部が設けられており、前記突起は、前記湾曲部と前記延伸部に隣接してそれらの間に設けられている、ことを特徴とする。 The rotor of the rotary electric machine of the present invention is a rotor of a rotary electric machine having a rotor core which accommodates permanent magnets and has a pair of magnet accommodating holes arranged so as to spread outward in a radial direction in a V shape on the outer periphery. Each magnet accommodating hole is provided with a gap at the inner peripheral end in a state of accommodating the permanent magnet, and the radial outer edge of the rotor core of the gap projects inward of the gap. A protrusion that does not contact the permanent magnet is provided, and a curved portion curved away from the corner of the permanent magnet is provided on the radial outer edge of the rotor core in the gap, and the pair of the gap is provided. A extending portion extending in the radial direction of the rotor core is provided on the other side edge of the magnet accommodating hole of the above, and the protrusion is provided between the curved portion and the extending portion adjacent to the extending portion. It is characterized by being.

本発明は、各磁石収容孔が永久磁石を収容した状態で内周端に間隙を有し、間隙のロータコアの径方向外側の縁には、間隙の内側に突出し永久磁石と接しない突起が設けられている。それにより、ステータからの磁束が突起に逃れ、永久磁石に直撃することが抑制されるため、永久磁石の減磁を抑制することができる。 In the present invention, each magnet accommodating hole has a gap at the inner peripheral end in a state where the permanent magnet is accommodated, and a protrusion protruding inside the gap and not in contact with the permanent magnet is provided on the radial outer edge of the rotor core of the gap. Has been done. As a result, the magnetic flux from the stator escapes to the protrusions and is suppressed from directly hitting the permanent magnet, so that demagnetization of the permanent magnet can be suppressed.

ロータコアの外観を示す斜視図である。It is a perspective view which shows the appearance of a rotor core. 図１のロータコアの破線で囲まれた部分を拡大した図であり、永久磁石が埋め込まれた状態のロータコアを示す図である。It is an enlarged view of the part surrounded by the broken line of the rotor core of FIG. 1, and is the figure which shows the rotor core in the state which the permanent magnet is embedded.

以下、図面を参照しながら本発明の実施形態について説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は、回転電機のロータ１０のロータコア１１を示す図である。図２は、図１のロータコア１１の破線で囲まれた部分を拡大した図であり、永久磁石１４が埋め込まれた状態のロータコア１１を示す図である。 FIG. 1 is a diagram showing a rotor core 11 of a rotor 10 of a rotary electric machine. FIG. 2 is an enlarged view of a portion of the rotor core 11 of FIG. 1 surrounded by a broken line, and is a diagram showing the rotor core 11 in a state in which the permanent magnet 14 is embedded.

図１に示すように、ロータコア１１は、円環形状にプレス打抜加工された電磁鋼板１６を例えば数百枚程度積層した積層鋼板により形成されている。ロータコア１１は、円環の内側にロータシャフトが配置され、複数の磁石収容孔１２の各々に永久磁石１４が収容されることで、ロータ１０を形成する。 As shown in FIG. 1, the rotor core 11 is formed of a laminated steel plate in which, for example, several hundreds of electromagnetic steel plates 16 press-punched into an annular shape are laminated. In the rotor core 11, the rotor shaft is arranged inside the annulus, and the permanent magnet 14 is accommodated in each of the plurality of magnet accommodating holes 12 to form the rotor 10.

回転電機は、ロータ１０と、ロータ１０の外周側に所定の間隔を隔てて配置され、巻線コイルが巻回されるステータ（不図示）とを含んで構成される。例えば、回転電機は、電気自動車やハイブリッド自動車などの電動車両に搭載され、電動車両が力行するときは電動機として機能し、電動車両が制動時にあるときは発電機として機能するモータ・ジェネレータである。回転電機は、電動機として機能する時、ステータの巻線コイルに駆動電流が供給され、この駆動電流によってステータの巻線コイルに発生した電磁力により、ステータに対してロータ１０が回転する。また、回転電機は、発電機として機能する時、ステータに対してロータ１０が回転することで、ステータの巻線コイルに誘起電流を発生させる。 The rotary electric machine includes a rotor 10 and a stator (not shown) arranged on the outer peripheral side of the rotor 10 at a predetermined interval and around which a winding coil is wound. For example, a rotary electric machine is a motor generator that is mounted on an electric vehicle such as an electric vehicle or a hybrid vehicle and functions as an electric motor when the electric vehicle is power running and as a generator when the electric vehicle is braking. When the rotary electric machine functions as an electric motor, a drive current is supplied to the winding coil of the stator, and the rotor 10 rotates with respect to the stator due to the electromagnetic force generated in the winding coil of the stator by this drive current. Further, when the rotary electric machine functions as a generator, the rotor 10 rotates with respect to the stator to generate an induced current in the winding coil of the stator.

本実施形態のロータ１０の説明を続ける。ロータコア１１の円環の軸線は、ロータの回転の軸線と一致する。図１に示すように、ロータコア１１の円環の外周部には、円環の軸線に沿う方向に延びる磁石収容孔１２が複数設けられている。磁石収容孔１２は、隣接する２個が対をなし、径方向外側に開いたＶ字形となるように配置されている。すなわち、ロータコア１１は、径方向外側へＶ字形に広がるように配置された一対の磁石収容孔１３を、外周部に複数備えている。磁石収容孔１２は、この実施形態では８対、１６個が配置される。 The description of the rotor 10 of this embodiment will be continued. The axis of the ring of the rotor core 11 coincides with the axis of rotation of the rotor. As shown in FIG. 1, a plurality of magnet accommodating holes 12 extending in a direction along the axis of the annulus are provided on the outer peripheral portion of the annulus of the rotor core 11. The magnet accommodating holes 12 are arranged so that two adjacent magnet accommodation holes 12 form a pair and form a V shape that opens outward in the radial direction. That is, the rotor core 11 is provided with a plurality of pair of magnet accommodating holes 13 arranged so as to spread outward in the radial direction in a V shape on the outer peripheral portion. In this embodiment, 8 pairs of 16 magnet accommodating holes 12 are arranged.

磁石収容孔１２には、直方体の永久磁石１４が収容される（図２参照）。Ｖ字を形成する対をなす２つの磁石収容孔１２の各々に収容される永久磁石１４は、極性の向きが同じになるように配置される。例えば、対をなす２つ永久磁石１４のそれぞれのＳ極がロータコア１１の径方向外側に向くよう配置される。この対に隣接する対においては、Ｎ極が径方向外側を向くように配置される。Ｖ字に配置される対をなす２個の永久磁石１４が一つの磁極を形成する。すなわち、ロータ１０は、径方向外側へＶ字形に広がるように配置された一対の永久磁石からなる磁極を、外周部に複数極備える。この実施形態では、８極の磁極を備える。なお、対をなす２個の永久磁石１４の間が磁極の中心となる。 A rectangular parallelepiped permanent magnet 14 is accommodated in the magnet accommodating hole 12 (see FIG. 2). The permanent magnets 14 housed in each of the two paired magnet housing holes 12 forming the V shape are arranged so that the polar directions are the same. For example, the S poles of the two paired permanent magnets 14 are arranged so as to face radially outward of the rotor core 11. In the pair adjacent to this pair, the north pole is arranged so as to face outward in the radial direction. Two pairs of permanent magnets 14 arranged in a V shape form one magnetic pole. That is, the rotor 10 is provided with a plurality of poles on the outer peripheral portion, which are made of a pair of permanent magnets arranged so as to spread outward in the radial direction in a V shape. In this embodiment, an 8-pole magnetic pole is provided. The center of the magnetic pole is between the two paired permanent magnets 14.

図１，２に示すように、Ｖ字形に隣り合う一対の磁石収容孔１３の間には中央ブリッジ３０が形成される。また、ロータコア１１の外周縁部において、磁石収容孔１２の径方向外側端とロータコア１１との外周面との間に外縁ブリッジ３２が形成される。 As shown in FIGS. 1 and 2, a central bridge 30 is formed between a pair of magnet accommodating holes 13 adjacent to each other in a V shape. Further, in the outer peripheral edge portion of the rotor core 11, an outer edge bridge 32 is formed between the radial outer end of the magnet accommodating hole 12 and the outer peripheral surface of the rotor core 11.

次に、磁石収容孔１２の形状、および、永久磁石１４の収容位置について詳細に説明する。一対の磁石収容孔１３の各々の形状は、左右対称の構造となっている。また、一対の磁石収容孔１３の各々に収容された永久磁石１４の位置も左右対称である。ここでは、一対の磁石収容孔および永久磁石のうち一方側の磁石収容孔１２および永久磁石１４について説明し、他方側のそれらについての説明は省略する。 Next, the shape of the magnet accommodating hole 12 and the accommodating position of the permanent magnet 14 will be described in detail. Each shape of the pair of magnet accommodating holes 13 has a symmetrical structure. Further, the positions of the permanent magnets 14 housed in each of the pair of magnet housing holes 13 are also symmetrical. Here, the magnet accommodation hole 12 and the permanent magnet 14 on one side of the pair of magnet accommodation holes and the permanent magnets will be described, and the description of those on the other side will be omitted.

図２に示すように、永久磁石１４は、中央ブリッジ３０側および外縁ブリッジ３２側に間隙１８，１９が設けられるように磁石収容孔１２に収容される。換言すれば、磁石収容孔１２は、永久磁石１４を収容した状態で、永久磁石１４の短辺と各電磁鋼板１６との間の領域に間隙１８，１９が設けられる。以下、中央ブリッジ３０側の間隙（内周端の間隙）を内周端間隙１８と、外縁ブリッジ３２側の間隙（外周端の間隙）を外周端間隙１９と言う。図２に示すように、永久磁石１４は、２箇所の位置決め用突起３４ａ，３４ｂ（磁石収容孔１２の間隙１８，１９の縁に形成された２つの突起）によって位置決めがされる。なお、内周端間隙１８および外周端間隙１９には、永久磁石１４を磁石収容孔１２に固定するための樹脂が注入されてもよい。 As shown in FIG. 2, the permanent magnet 14 is accommodated in the magnet accommodating hole 12 so that the gaps 18 and 19 are provided on the central bridge 30 side and the outer edge bridge 32 side. In other words, the magnet accommodating holes 12 are provided with gaps 18 and 19 in the region between the short side of the permanent magnet 14 and each of the electromagnetic steel sheets 16 in a state where the permanent magnet 14 is accommodated. Hereinafter, the gap on the central bridge 30 side (gap at the inner peripheral end) is referred to as an inner peripheral end gap 18, and the gap on the outer edge bridge 32 side (gap at the outer peripheral end) is referred to as an outer peripheral end gap 19. As shown in FIG. 2, the permanent magnet 14 is positioned by two positioning protrusions 34a and 34b (two protrusions formed on the edges of the gaps 18 and 19 of the magnet accommodating holes 12). A resin for fixing the permanent magnet 14 to the magnet accommodating hole 12 may be injected into the inner peripheral end gap 18 and the outer peripheral end gap 19.

図２に示すように、本実施形態のロータコア１１は、内周端間隙１８のロータコア１１の径方向外側の縁に、内周端間隙１８の内側に突出した突起２０（減磁抑制用突起）が設けられる。突起２０は永久磁石１４に接しておらず、突起２０と永久磁石１４との間には隙間２２が存在する。 As shown in FIG. 2, the rotor core 11 of the present embodiment has a protrusion 20 (a protrusion for suppressing demagnetization) protruding inward of the inner peripheral end gap 18 at the radial outer edge of the rotor core 11 of the inner peripheral end gap 18. Is provided. The protrusion 20 is not in contact with the permanent magnet 14, and there is a gap 22 between the protrusion 20 and the permanent magnet 14.

次に、本実施形態の回転電機のロータ１０の作用効果について説明する。 Next, the operation and effect of the rotor 10 of the rotary electric machine of the present embodiment will be described.

本実施形態のロータ１０は、磁石収容孔１２に永久磁石１４を収容した状態で、内周端に間隙（内周端間隙１８）が設けられる。そして、内周端間隙１８のロータコア１１の径方向外側の縁には、内周端間隙１８の内側に突出し、永久磁石１４と接しない突起２０（減磁抑制用突起）が設けられる。これにより、ステータからの磁束が突起２０に流れ、永久磁石１４（特に中央ブリッジ３０側の部分）に直撃することを抑制することができる。すなわち、ステータ磁束が突起２０に流れることで、永久磁石１４の反磁界強度を低減でき、永久磁石１４が減磁してしまうことを抑制することができる。本実施形態によれば、ロータコア１１に突起２０を設けるという簡便な構成により、永久磁石１４の減磁耐性を向上することができる。 In the rotor 10 of the present embodiment, a gap (inner peripheral end gap 18) is provided at the inner peripheral end in a state where the permanent magnet 14 is accommodated in the magnet accommodating hole 12. Then, on the radial outer edge of the rotor core 11 of the inner peripheral end gap 18, a protrusion 20 (projection for suppressing demagnetization) that protrudes inside the inner peripheral end gap 18 and does not come into contact with the permanent magnet 14 is provided. As a result, it is possible to prevent the magnetic flux from the stator from flowing to the protrusion 20 and directly hitting the permanent magnet 14 (particularly the portion on the central bridge 30 side). That is, since the stator magnetic flux flows through the protrusions 20, the demagnetic field strength of the permanent magnet 14 can be reduced, and demagnetization of the permanent magnet 14 can be suppressed. According to this embodiment, the demagnetization resistance of the permanent magnet 14 can be improved by a simple configuration in which the protrusion 20 is provided on the rotor core 11.

１０ 回転電機のロータ、１１ ロータコア、１２ 磁石収容孔、１３ 一対の磁石収容孔、１４ 永久磁石、１６ 電磁鋼板、１８ 間隙（内周端間隙）、１９ 間隙（外周端間隙）、２０ 突起（減磁抑制用突起）、２２ 隙間、３０ 中央ブリッジ、３２ 外縁ブリッジ、３４ａ，３４ｂ 突起（位置決め用突起）。 10 Rotating electric machine rotor, 11 rotor core, 12 magnet accommodation holes, 13 pair of magnet accommodation holes, 14 permanent magnets, 16 electrical steel sheets, 18 gaps (inner peripheral edge gap), 19 gaps (outer peripheral edge gap), 20 protrusions (reduced) Magnetic suppression protrusions), 22 gaps, 30 central bridges, 32 outer edge bridges, 34a, 34b protrusions (positioning protrusions).

Claims (1)

それぞれ永久磁石を収容し、径方向外側へＶ字形に広がるように配置された一対の磁石収容孔を、外周部に複数極備えるロータコアを有する回転電機のロータであって、
前記各磁石収容孔は、前記永久磁石を収容した状態で、内周端に間隙が設けられ、
前記間隙の前記ロータコアの径方向外側の縁には、前記間隙の内側に突出し、前記永久磁石と接しない突起が設けられており、
前記間隙の前記ロータコアの径方向外側の縁には、前記永久磁石の角から離れるように湾曲した湾曲部が設けられており、
前記間隙の前記一対の磁石収容孔のうちの他方側の縁には、前記ロータコアの径方向に延びる延伸部が設けられており、
前記突起は、前記湾曲部と前記延伸部に隣接してそれらの間に設けられている、
回転電機のロータ。 A rotor of a rotary electric machine having a rotor core having a pair of magnet accommodating holes arranged so as to accommodate permanent magnets and spread outward in a radial direction in a V shape on the outer peripheral portion.
Each of the magnet accommodating holes is provided with a gap at the inner peripheral end in a state of accommodating the permanent magnet.
The radial outer edge of the rotor core in the gap is provided with a protrusion that projects inward of the gap and does not come into contact with the permanent magnet .
A curved portion curved away from the corner of the permanent magnet is provided on the radial outer edge of the rotor core in the gap.
An extension portion extending in the radial direction of the rotor core is provided on the other edge of the pair of magnet accommodating holes in the gap.
The protrusion is provided adjacent to and between the curved portion and the stretched portion.
Rotating machine rotor.
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