JP6651496B2

JP6651496B2 - Rotating electric machine

Info

Publication number: JP6651496B2
Application number: JP2017246038A
Authority: JP
Inventors: 大樹梶野
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 2017-12-22
Filing date: 2017-12-22
Publication date: 2020-02-19
Anticipated expiration: 2037-12-22
Also published as: CN109962578B; CN109962578A; JP2019115142A

Description

本発明は、永久磁石を有するロータと、ロータを回転駆動するステータとを備える回転電機に関し、特に冷却油によってロータ及びステータ巻線の冷却を行う回転電機に関する。 The present invention relates to a rotating electric machine including a rotor having a permanent magnet and a stator that rotationally drives the rotor, and more particularly to a rotating electric machine that cools a rotor and stator windings with cooling oil.

特許文献１には、ステータと、ステータの内側において回転軸に固定され、ステータが生成する磁束によって回転するロータとを備え、ロータは、閉塞端及び開口端を有する筒状部材に永久磁石を取り付けて構成された回転電機が示されている。この回転電機は、回転軸の一端側から筒状部材の閉塞端へ冷却油が供給され、筒状部材の閉塞端に設けられた２つの貫通孔を介して、筒状部材の内側に冷却油が流入するように構成されている。この構成によって、筒状部材の内側に配置された部材やロータに取り付けられた永久磁石の冷却が行われる。 Patent Literature 1 includes a stator and a rotor fixed to a rotating shaft inside the stator and rotated by a magnetic flux generated by the stator. The rotor has a permanent magnet attached to a cylindrical member having a closed end and an open end. Is shown. In this rotary electric machine, cooling oil is supplied to the closed end of the cylindrical member from one end side of the rotating shaft, and the cooling oil is supplied to the inside of the cylindrical member through two through holes provided at the closed end of the cylindrical member. Is configured to flow. With this configuration, the members arranged inside the cylindrical member and the permanent magnet attached to the rotor are cooled.

特開２０１５−７０６５６号公報JP-A-2005-70656

回転電機の回転速度が比較的低い低回転速度領域（例えば４０００ｒｐｍ以下の領域）では、永久磁石の温度を低くすることが出力トルク特性の向上に寄与するが、中回転速度領域（例えば４０００〜６０００ｒｐｍの領域）では、永久磁石の冷却を抑制することによって永久磁石が生成する磁束密度を低下させて、弱め界磁電流を低減すること望ましく、さらに高回転速度領域（例えば６０００ｒｐｍ以上の領域）では、永久磁石の温度上昇が大きくなるため、永久磁石の冷却を十分に行う必要がある。すなわち、回転速度に依存して主たる冷却部位を変化させるという冷却要求を満たすことが求められる。 In a low rotation speed region where the rotation speed of the rotating electric machine is relatively low (for example, a region of 4000 rpm or less), lowering the temperature of the permanent magnet contributes to the improvement of the output torque characteristics, but a medium rotation speed region (for example, 4000 to 6000 rpm) Region), it is desirable to reduce the magnetic flux density generated by the permanent magnets by suppressing the cooling of the permanent magnets to reduce the field-weakening current. Since the temperature rise of the permanent magnet increases, it is necessary to sufficiently cool the permanent magnet. That is, it is required to satisfy a cooling requirement of changing a main cooling portion depending on the rotation speed.

上記従来の回転電機の構成では、回転速度領域毎に異なる冷却要求を十分に満たすように冷却油を供給することは困難であった。 In the configuration of the above-described conventional rotating electric machine, it has been difficult to supply the cooling oil so as to sufficiently satisfy the different cooling requirements for each rotation speed region.

本発明はこの点に着目してなされたものであり、回転速度に依存して変化する要冷却部位を、適切に冷却することができる回転電機を提供することを目的とする。 The present invention has been made in view of this point, and it is an object of the present invention to provide a rotating electric machine that can appropriately cool a cooling required portion that changes depending on a rotation speed.

上記目的を達成するため請求項１に記載の発明は、ケーシング（２）に固定され、磁束を生成するステータ（８）と、前記ケーシングに回転可能に支持された回転軸（３）と、前記ステータ（８）の内側において前記回転軸（３）に固定され、前記ステータ（８）が生成する磁束によって回転するロータ（４）とを備える回転電機（１）であって、前記ロータ（８）は、閉塞端及び開口端を有する筒状部材であって、前記閉塞端側で前記回転軸（３）に固定された筒状部材（５）と、該筒状部材（５）の外周部に取り付けられた永久磁石（６）とを備え、前記筒状部材（５）の閉塞端に冷却油を供給する冷却油供給手段（１２，１４）と、前記閉塞端に設けられ、前記ロータ（４）の回転速度に応じて前記冷却油の主たる供給先を変更する供給先変更手段とを備え、前記供給先変更手段は、前記閉塞端を閉塞する底部（２１）に設けられ、前記冷却油が前記筒状部材（５）の内側に流入する第１及び第２流入孔（２２，２３）と、前記底部（２１）の前記第１及び第２流入孔（２２，２３）の径方向外側に、前記回転軸（３）と同心円状に設けられ、前記閉塞端から前記冷却油供給手段側へ突出した第１及び第２突出部（２４，２５）と、前記第１突出部（２４）と第２突出部（２５）との間に前記回転軸（３）と同心状に設けられ、前記閉塞端から前記冷却油供給手段側へ突出した第３突出部（２６）と、該第３突出部（２６）の径方向内側に設けられた第３流入孔（２７）と、該第３流入孔（２７）から前記底部（２１）の内部を通り、前記底部（２１）の径方向外側に開口する冷却油通路（２８）とによって構成され、前記第２流入孔（２３）は前記第１流入孔（２２）の径方向外側に配置されるとともに、前記第３突出部（２６）の突出量（ＰＸ３）は、前記第１突出部の突出量（ＰＸ１）より大きく、かつ前記第２突出部（２５）の突出量（ＰＸ２）は前記第３突出部の突出量（ＰＸ３）より大きいものであり、前記回転速度が比較的低い低速運転状態、及び前記回転速度が比較的高い高速運転状態では、主として前記筒状部材（５）の内側において、前記永久磁石（６）の取り付け部に向けて前記冷却油を供給し、前記回転速度が前記低速運転状態と高速運転状態との間の回転速度である中速運転状態では、主として前記ステータ（８）の巻線（８ａ）に向けて前記冷却油を供給することを特徴とする。 In order to achieve the above object, an invention according to claim 1 includes a stator (8) fixed to a casing (2) and generating a magnetic flux, a rotating shaft (3) rotatably supported by the casing, and A rotary electric machine (1) fixed to the rotating shaft (3) inside a stator (8) and comprising a rotor (4) rotated by a magnetic flux generated by the stator (8), wherein the rotor (8) Is a cylindrical member having a closed end and an open end, wherein a cylindrical member (5) fixed to the rotating shaft (3) on the closed end side, and an outer peripheral portion of the cylindrical member (5). A cooling oil supply means (12, 14) for supplying cooling oil to the closed end of the tubular member (5), the cooling oil supply means being provided at the closed end of the cylindrical member (5); ), The main supply destination of the cooling oil is changed according to the rotation speed. And a previous change means, the supply destination changing means, provided at the bottom for closing the closed end (21), first and second inflow flowing inside the cooling oil is the tubular member (5) Holes (22, 23) and radially outside the first and second inflow holes (22, 23) of the bottom portion (21) are provided concentrically with the rotating shaft (3), and extend from the closed end. First and second protrusions (24, 25) protruding toward the cooling oil supply means; and the rotating shaft (3) between the first protrusion (24) and the second protrusion (25). A third protruding portion (26) provided concentrically and protruding from the closed end toward the cooling oil supply means, and a third inflow hole (27) provided radially inward of the third protruding portion (26). ), From the third inflow hole (27), through the inside of the bottom portion (21), and open outward in the radial direction of the bottom portion (21). A cooling oil passage (28), the second inflow hole (23) is arranged radially outside of the first inflow hole (22), and the amount of protrusion of the third protrusion (26) ( PX3) is larger than the protrusion amount (PX1) of the first protrusion, and the protrusion amount (PX2) of the second protrusion (25) is larger than the protrusion amount (PX3) of the third protrusion. In a low-speed operation state in which the rotation speed is relatively low and a high-speed operation state in which the rotation speed is relatively high, the inside of the tubular member (5) is directed toward the mounting portion of the permanent magnet (6). In a medium-speed operation state in which the cooling oil is supplied and the rotation speed is a rotation speed between the low-speed operation state and the high-speed operation state, the cooling oil is mainly directed toward the winding (8a) of the stator (8). Is supplied.

この構成によれば、回転速度が比較的低い低速運転状態、及び回転速度が比較的高い高速運転状態では、主として筒状部材の内側において永久磁石の取り付け部に向けて冷却油が供給され、回転速度が低速運転状態と高速運転状態との間の回転速度である中速運転状態では、主としてステータの巻線に向けて冷却油が供給されるので、上述した冷却要求を満たし、回転速度領域に対応して適切な冷却を行うことができる。すなわち、低速運転状態では、冷却油に加わる遠心力が比較的小さいため、第１突出部から第１流入孔を介して筒状部材の内側に冷却油が流入し、永久磁石の冷却が促進される。高速運転状態では、冷却油に加わる遠心力が比較的大きいため、第２突出部から第２流入孔を介して筒状部材の内側に冷却油が流入し、永久磁石の冷却が促進される。一方中速運転状態では、第３突出部及び冷却油通路を介して、冷却油がロータの径方向外側に位置するステータの巻線に供給され、巻線の冷却が促進される。 According to this configuration, in a low-speed operation state in which the rotation speed is relatively low, and in a high-speed operation state in which the rotation speed is relatively high, the cooling oil is mainly supplied to the mounting portion of the permanent magnet inside the tubular member, and In the medium-speed operation state in which the speed is the rotation speed between the low-speed operation state and the high-speed operation state, the cooling oil is mainly supplied to the windings of the stator. Appropriate cooling can be performed accordingly. That is, in the low-speed operation state, since the centrifugal force applied to the cooling oil is relatively small, the cooling oil flows into the inside of the cylindrical member from the first protrusion through the first inflow hole, and the cooling of the permanent magnet is promoted. You. In the high-speed operation state, since the centrifugal force applied to the cooling oil is relatively large, the cooling oil flows into the inside of the tubular member from the second protrusion through the second inflow hole, and cooling of the permanent magnet is promoted. On the other hand, in the medium-speed operation state, the cooling oil is supplied to the stator winding located radially outside the rotor via the third protrusion and the cooling oil passage, and cooling of the winding is promoted.

請求項２に記載の発明は、ケーシング（２）に固定され、磁束を生成するステータ（８）と、前記ケーシングに回転可能に支持された回転軸（３）と、前記ステータ（８）の内側において前記回転軸（３）に固定され、前記ステータ（８）が生成する磁束によって回転するロータ（４）とを備える回転電機（１）であって、前記ロータ（８）は、閉塞端及び開口端を有する筒状部材であって、前記閉塞端側で前記回転軸（３）に固定された筒状部材（５）と、該筒状部材（５）の外周部に取り付けられた永久磁石（６）とを備え、前記筒状部材（５）の閉塞端に冷却油を供給する冷却油供給手段（１２，１４）と、前記閉塞端に設けられ、前記ロータ（４）の回転速度に応じて前記冷却油の主たる供給先を変更する供給先変更手段とを備え、前記供給先変更手段は、前記閉塞端を閉塞する底部（２１ａ）と、径方向外側へ向かう付勢力を有する薄板帯状の第１弾性部材（４２）と、該第１弾性部材（４２）を径方向内側へ向けて付勢する第２弾性部材（４３）とによって構成され、前記底部（２１ａ）は、前記冷却油が前記筒状部材（５ａ）の内側に流入する第１及び第２流入孔（４４，４５）と、前記第２流入孔（４５）の径方向外側に、前記回転軸（３）と同心円状に設けられ、前記閉塞端から前記冷却油供給手段側へ突出した第１突出部（４６）と、前記回転軸（３）に接する位置において前記回転軸（３）と同心円状に設けられ、前記閉塞端から前記冷却油供給手段側へ突出した第２突出部（４７）と、前記閉塞端の前記冷却油供給手段側に前記閉塞端から離間して配置され、前記第１流入孔（４４）と第２流入孔（４５）との間において前記閉塞端に対向する位置に前記回転軸（３）と同心状に設けられた環状部材（４１）とを備え、前記環状部材（４１）は前記第２突出部（４７）から径方向外側方向へ延びる支持部（４１ａ）によって支持されており、前記第１弾性部材（４２）は、前記第１突出部（４６）の径方向内側において前記回転軸（３）を囲む位置に前記回転速度が高くなるほど実質的な直径が増加可能に配設され、前記第２弾性部材（４３）は、前記第１弾性部材（４２）と前記第１突出部（４６）との間に配設され、前記第２流入孔（４５）は前記第１流入孔（４４）の径方向外側に配置されるとともに、前記第１弾性部材（１３）は前記第２流入孔（４５）を閉塞可能な厚みを有し、前記低速運転状態では前記第１弾性部材（４２）が前記環状部材（４１）と前記閉塞端との間隙を閉塞し、前記中速運転状態では前記第１弾性部材（４２）が前記第２流入孔（４５）を閉塞し、前記高速運転状態では前記第１弾性部材（４２）が前記第２流入孔（４５）の径方向外側に位置するように、前記第１及び第２弾性部材（４２，４３）の付勢力が設定されているものであり、前記回転速度が比較的低い低速運転状態、及び前記回転速度が比較的高い高速運転状態では、主として前記筒状部材（５）の内側において、前記永久磁石（６）の取り付け部に向けて前記冷却油を供給し、前記回転速度が前記低速運転状態と高速運転状態との間の回転速度である中速運転状態では、主として前記ステータ（８）の巻線（８ａ）に向けて前記冷却油を供給することを特徴とする。 The invention according to claim 2 is a stator (8) fixed to the casing (2) and generating a magnetic flux, a rotating shaft (3) rotatably supported by the casing, and an inner side of the stator (8). And a rotor (4) fixed to the rotating shaft (3) and rotated by a magnetic flux generated by the stator (8), wherein the rotor (8) has a closed end and an opening. A cylindrical member having an end, a cylindrical member (5) fixed to the rotating shaft (3) on the closed end side, and a permanent magnet (20) attached to an outer peripheral portion of the cylindrical member (5). 6), a cooling oil supply means (12, 14) for supplying cooling oil to a closed end of the tubular member (5), and a cooling oil supply means (12, 14) provided at the closed end according to the rotation speed of the rotor (4). and a supply destination changing means for changing the main supply destination of the cooling oil Te, The supply destination changing means includes a bottom portion (21a) for closing the closed end, a thin band-shaped first elastic member (42) having a biasing force directed radially outward, and a diameter of the first elastic member (42). A second elastic member (43) biasing inward in the direction, and the bottom portion (21a) is provided with first and second inflow holes through which the cooling oil flows into the inside of the tubular member (5a). (44, 45) and a first projection radially outside of the second inflow hole (45) and provided concentrically with the rotating shaft (3) and projecting from the closed end toward the cooling oil supply means. A portion (46), a second projecting portion (47) provided concentrically with the rotating shaft (3) at a position in contact with the rotating shaft (3), and projecting from the closed end toward the cooling oil supply means. Is disposed on the cooling oil supply means side of the closed end, away from the closed end. An annular member (41) provided concentrically with the rotating shaft (3) at a position facing the closed end between the first inflow hole (44) and the second inflow hole (45). The annular member (41) is supported by a support part (41a) extending radially outward from the second protrusion (47), and the first elastic member (42) is supported by the first protrusion ( 46) is disposed radially inward at a position surrounding the rotation shaft (3) so that the substantial diameter can be increased as the rotation speed increases, and the second elastic member (43) is provided with the first elastic member. (42) and the first protrusion (46), the second inflow hole (45) is arranged radially outside the first inflow hole (44), and The elastic member (13) has a thickness capable of closing the second inflow hole (45). In the high-speed operation state, the first elastic member (42) closes the gap between the annular member (41) and the closed end, and in the medium-speed operation state, the first elastic member (42) is closed by the second inflow hole. The first and second elastic members (42, 42) are closed such that the first elastic member (42) is positioned radially outside the second inflow hole (45) in the high-speed operation state. 43) is set , and in the low-speed operation state where the rotation speed is relatively low and the high-speed operation state where the rotation speed is relatively high, mainly the inside of the tubular member (5) The cooling oil is supplied to a mounting portion of the permanent magnet (6), and in a medium speed operation state in which the rotation speed is a rotation speed between the low speed operation state and the high speed operation state, the stator (8) is mainly used. )) Toward the winding (8a) And wherein the supply.

この構成によれば、回転速度が比較的低い低速運転状態、及び回転速度が比較的高い高速運転状態では、主として筒状部材の内側において永久磁石の取り付け部に向けて冷却油が供給され、回転速度が低速運転状態と高速運転状態との間の回転速度である中速運転状態では、主としてステータの巻線に向けて冷却油が供給されるので、上述した冷却要求を満たし、回転速度領域に対応して適切な冷却を行うことができる。すなわち、低速運転状態では第１弾性部材によって環状部材と閉塞端との間隙が閉塞されるため、冷却油が主として第１流入孔を介して永久磁石の取り付け部に供給され、高速運転状態では、第１弾性部材の実質的な直径が遠心力によって拡大し、第１弾性部材が第２流入孔の径方向外側に位置するので、冷却油が主として第２流入孔を介して永久磁石の取り付け部に供給される。したがって、低速運転状態及び高速運転状態では、永久磁石の冷却が促進される。一方中速運転状態では、第１弾性部材によって第２流入孔が閉塞され、冷却油に作用する遠心力は低速運転状態より大きいので、冷却油が第１弾性部材を迂回してステータの巻線に供給され、巻線の冷却が促進される。 According to this configuration, in a low-speed operation state in which the rotation speed is relatively low, and in a high-speed operation state in which the rotation speed is relatively high, the cooling oil is mainly supplied to the mounting portion of the permanent magnet inside the tubular member, and In the medium-speed operation state in which the speed is the rotation speed between the low-speed operation state and the high-speed operation state, the cooling oil is mainly supplied to the windings of the stator. Appropriate cooling can be performed accordingly. That is, in the low-speed operation state, since the gap between the annular member and the closed end is closed by the first elastic member, the cooling oil is mainly supplied to the mounting portion of the permanent magnet through the first inflow hole. Since the substantial diameter of the first elastic member is enlarged by centrifugal force and the first elastic member is located radially outside the second inflow hole, the cooling oil mainly passes through the second inflow hole to attach the permanent magnet. Supplied to Therefore, in the low-speed operation state and the high-speed operation state, the cooling of the permanent magnet is promoted. On the other hand, in the medium-speed operation state, the second inflow hole is closed by the first elastic member, and the centrifugal force acting on the cooling oil is larger than the low-speed operation state. To promote cooling of the windings.

本発明の第１実施形態にかかる回転電機の要部断面図である。FIG. 2 is a sectional view of a main part of the rotary electric machine according to the first embodiment of the present invention. 筒状部材（５）をより詳細に説明するための図である。It is a figure for explaining a cylindrical member (5) in more detail. 本発明の第２実施形態にかかる供給先変更手段を説明するための図である（低速運転状態）。It is a figure for explaining supply destination change means concerning a 2nd embodiment of the present invention (low-speed operation state). 本発明の第２実施形態にかかる供給先変更手段を説明するための図である（中速運転状態）。It is a figure for explaining supply destination change means concerning a 2nd embodiment of the present invention (medium speed operation state). 本発明の第２実施形態にかかる供給先変更手段を説明するための図である（高速運転状態）。It is a figure for explaining supply destination change means concerning a 2nd embodiment of the present invention (high-speed operation state).

以下本発明の実施の形態を図面を参照して説明する。
［第１実施形態］
図１は本発明の一実施形態にかかる回転電機の要部断面図であり、回転電機１は、ケーシング２に固定され、磁束を生成するステータ８と、軸受（図示せず）を介してケーシング２に回転可能に支持された回転軸３と、ステータ８の内側において回転軸３に固定され、ステータ８が生成する磁束によって回転するロータ４と、ケーシング２に固定されたサイドカバー１１とを備える。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is a cross-sectional view of a main part of a rotating electric machine according to an embodiment of the present invention. The rotating electric machine 1 is fixed to a casing 2 and has a casing 8 via a stator 8 that generates a magnetic flux and a bearing (not shown). A rotating shaft 3 rotatably supported by the rotating shaft 2, a rotor 4 fixed to the rotating shaft 3 inside the stator 8 and rotated by a magnetic flux generated by the stator 8, and a side cover 11 fixed to the casing 2. .

ロータ４は、閉塞端及び開口端を有する筒状部材５であって、閉塞端側で回転軸３に固定された筒状部材５と、筒状部材５の外周部に取り付けられたロータ本体７とによって構成される。ロータ本体７は、磁性材からなる基部７ａ及び永久磁石６を備える。ステータ８には巻線８ａが巻回されている。 The rotor 4 is a cylindrical member 5 having a closed end and an open end, and includes a cylindrical member 5 fixed to the rotating shaft 3 on the closed end side, and a rotor body 7 attached to an outer peripheral portion of the cylindrical member 5. It is composed of The rotor body 7 includes a base 7 a made of a magnetic material and a permanent magnet 6. A winding 8 a is wound around the stator 8.

サイドカバー１１には、ケーシング２内に配置されるロータ本体７及びステータ８（巻線８ａ）などを冷却するための冷却油を供給する冷却油通路１２が形成されており、流入孔１３には図示しない冷却油ポンプ及び油路によって、冷却油が供給される。冷却油通路１２に流入した冷却油は吐出孔１４から吐出され、回転軸３の内部に設けられた通路１５に流入するとともに、回転電機１の作動中は遠心力によってロータ本体７及びステータ８（巻線８ａ）に冷却油が供給される。筒状部材５の内部、及びケーシング２内の空間３０には、回転軸３のトルクを伝達する機構が設けられているが、本発明と直接関係がないため図示を省略している。回転軸３には通路１５と空間３０とを連通する吐出孔１６が設けられており、冷却油が図示しない機構へ潤滑油として供給される。 The side cover 11 is formed with a cooling oil passage 12 for supplying cooling oil for cooling the rotor body 7 and the stator 8 (winding 8 a) arranged in the casing 2. Cooling oil is supplied by a cooling oil pump and an oil passage (not shown). The cooling oil flowing into the cooling oil passage 12 is discharged from the discharge hole 14 and flows into a passage 15 provided inside the rotating shaft 3, and the rotor body 7 and the stator 8 ( Cooling oil is supplied to the windings 8a). A mechanism for transmitting the torque of the rotating shaft 3 is provided in the interior of the tubular member 5 and in the space 30 in the casing 2, but is omitted from the drawing because it has no direct relation to the present invention. The rotary shaft 3 is provided with a discharge hole 16 that communicates the passage 15 with the space 30, and the cooling oil is supplied to a mechanism (not shown) as lubricating oil.

図２は筒状部材５をより詳細に説明するための図であり、同図（ａ）は図１の左方向からみた筒状部材５の正面図であり、同図（ｂ）は同図（ａ）に示すＡ−Ａ線断面図（図１の一部に相当、ロータ本体７を含む）であり、同図（ｃ）は同図（ａ）に示すＢ−Ｂ線断面図（ロータ本体７、ステータ８、及び巻線８ａを含み、回転軸３の上側部分のみを示す）のである。 2A and 2B are diagrams for explaining the tubular member 5 in more detail. FIG. 2A is a front view of the tubular member 5 as viewed from the left in FIG. 1, and FIG. FIG. 2A is a sectional view taken along line AA (corresponding to a part of FIG. 1 and includes the rotor body 7), and FIG. 2C is a sectional view taken along line BB shown in FIG. Only the upper part of the rotating shaft 3 is shown including the main body 7, the stator 8, and the winding 8a).

筒状部材５の閉塞端を閉塞する底部２１には、冷却油が筒状部材５の内側に流入する４個の第１流入孔２２及び４個の第２流入孔２３と、第１流入孔２２の径方向外側に、回転軸３と同心円状に設けられ、閉塞端からサイドカバー１１側へ突出した第１突出部２４と、第２流入孔２３の径方向外側に、回転軸３と同心円状に設けられ、閉塞端からサイドカバー１１側へ突出した第２突出部２５と、第１突出部２４と第２突出部２５との間に回転軸３と同心状に設けられ、閉塞端からサイドカバー１１側へ突出した第３突出部２６と、第３突出部２６の径方向内側に設けられた４個の第３流入孔２７と、第３流入孔２７から底部２１の内部を通り、底部２１の径方向外側に開口する冷却油通路２８とが設けられている。 In a bottom portion 21 for closing the closed end of the tubular member 5, four first inflow holes 22 and four second inflow holes 23 through which the cooling oil flows into the inside of the tubular member 5, and a first inflow hole A first protruding portion 24 is provided concentrically with the rotating shaft 3 radially outward of the second shaft 22 and protrudes from the closed end toward the side cover 11, and a concentric circle with the rotating shaft 3 radially outward of the second inflow hole 23. A second protruding portion 25 protruding from the closed end toward the side cover 11, and provided concentrically with the rotating shaft 3 between the first protruding portion 24 and the second protruding portion 25, from the closed end A third protruding portion 26 protruding toward the side cover 11, four third inflow holes 27 provided radially inward of the third protruding portion 26, and the inside of the bottom portion 21 from the third inflow hole 27, A cooling oil passage 28 that opens outward in the radial direction of the bottom 21 is provided.

第２流入孔２３は第１流入孔２２の径方向外側に配置されるとともに、第３突出部２６の突出量ＰＸ３は、第１突出部２２の突出量ＰＸ１より大きく、かつ第２突出部２５の突出量ＰＸ２は第３突出部の突出量ＰＸ３より大きくなるように構成されている。 The second inflow hole 23 is disposed radially outward of the first inflow hole 22, and the protrusion amount PX3 of the third protrusion 26 is greater than the protrusion amount PX1 of the first protrusion 22, and the second protrusion 25 Is configured to be larger than the protrusion amount PX3 of the third protrusion.

図２に示した構成によれば、回転電機１が比較的低い回転速度（例えば４０００ｒｐｍ以下）で回転する低速運転状態では、冷却油に加わる遠心力が比較的小さいため、図２（ｂ）に実線の矢線（矢印を付した線）で示すように、主として第１突出部２４から第１流入孔２２を介して筒状部材５の内側に冷却油が流入し、永久磁石６の冷却が促進される。回転電機１が比較的高い回転速度（例えば６０００ｒｐｍ以上）で回転する高速運転状態では、冷却油に加わる遠心力が比較的大きいため、図２（ｂ）に破線の矢線で示すように、主として第２突出部２５から第２流入孔２３を介して筒状部材５の内側に冷却油が流入し、低速運転状態と同様に永久磁石６の冷却が促進される。一方中速運転状態（例えば回転速度が４０００から６０００ｒｐｍまでの範囲内にある状態）では、図２（ｃ）に実線の矢線で示すように、主として第３突出部２６、第３流入孔２７、及び冷却油通路２８を介して、冷却油がロータ本体７の径方向外側に位置するステータ８の巻線８ａに供給され、巻線８ａの冷却が促進される。その結果、低速運転状態及び高速運転状態において永久磁石６の冷却を促進し、中速運転状態ではステータ巻線８ａの冷却を促進するという回転速度に応じた冷却要求を満たすことができる。 According to the configuration shown in FIG. 2, in a low-speed operation state in which the rotating electric machine 1 rotates at a relatively low rotation speed (for example, 4000 rpm or less), the centrifugal force applied to the cooling oil is relatively small. As indicated by a solid arrow (a line with an arrow), cooling oil mainly flows into the inside of the tubular member 5 from the first protruding portion 24 through the first inflow hole 22 to cool the permanent magnet 6. Promoted. In a high-speed operation state in which the rotating electric machine 1 rotates at a relatively high rotation speed (for example, 6000 rpm or more), since the centrifugal force applied to the cooling oil is relatively large, as shown by the broken arrow in FIG. Cooling oil flows into the inside of the tubular member 5 from the second protrusion 25 through the second inflow hole 23, and cooling of the permanent magnet 6 is promoted as in the low-speed operation state. On the other hand, in a medium speed operation state (for example, a state in which the rotation speed is in a range from 4000 to 6000 rpm), as shown by a solid arrow in FIG. 2C, the third protruding portion 26 and the third inflow hole 27 are mainly provided. The cooling oil is supplied to the winding 8a of the stator 8 located radially outside the rotor body 7 via the cooling oil passage 28, and cooling of the winding 8a is promoted. As a result, it is possible to satisfy the cooling demand according to the rotation speed, which promotes the cooling of the permanent magnet 6 in the low-speed operation state and the high-speed operation state, and promotes the cooling of the stator winding 8a in the medium-speed operation state.

本実施形態では、サイドカバー１１及び冷却油通路１２によって冷却油供給手段が構成され、筒状部材５の底部２１に設けられた第１〜第３突出部２４，２５，２６、第１及び第２流入孔２２，２３、第３流入孔２７、及び冷却油通路２８が、供給先変更手段を構成する。 In the present embodiment, the side cover 11 and the cooling oil passage 12 constitute a cooling oil supply unit, and the first to third protrusions 24, 25, 26, the first and the third provided on the bottom 21 of the tubular member 5. The 2 inflow holes 22 and 23, the 3rd inflow hole 27, and the cooling oil passage 28 constitute supply destination changing means.

［第２実施形態］
図３〜図５は、本発明の第２実施形態にかかる供給先変更手段を説明するための図であり、図３，図４，及び図５は、それぞれ回転電機１の低速運転状態、中速運転状態、及び高速運転状態に対応する。これらの図において各図（ａ）は、図１の左方向からみた筒状部材５を筒状部材５ａに代えた場合の正面図であり、各図（ｂ）は同図（ａ）に示すＡ−Ａ線断面図（ロータ本体７を含む）であり、図３（ｃ）は同図（ａ）に示すＢ−Ｂ線断面図（ロータ本体７を含む）である。なお、図４（ｂ）にはステータ８及び巻線８ａも示されている。 [Second embodiment]
FIGS. 3 to 5 are diagrams for explaining a supply destination changing unit according to the second embodiment of the present invention. FIGS. 3, 4, and 5 show the rotating electric machine 1 in a low-speed operation state and a middle state, respectively. It corresponds to the high-speed operation state and the high-speed operation state. In these figures, each figure (a) is a front view when the tubular member 5 is replaced with a tubular member 5a as viewed from the left direction in FIG. 1, and each figure (b) is shown in the same figure (a). FIG. 3C is a sectional view taken along line AA (including the rotor body 7), and FIG. 3C is a sectional view taken along line BB (including the rotor body 7) shown in FIG. FIG. 4B also shows the stator 8 and the winding 8a.

本実施形態では、供給先変更手段は、第１実施形態における筒状部材５を変形した筒状部材５ａの底部２１ａと、径方向外側へ向かう付勢力を有する薄板帯状の第１弾性部材４２と、第１弾性部材４２を径方向内側へ付勢する第２弾性部材４３とによって構成される。第１及び第２弾性部材４２，４３は、例えばステンレススチールで構成され、フォイル軸受を構成するトップフォイル及びバンプフォイル（バックフォイル）として知られているものと同様のものが適用可能である。 In the present embodiment, the supply destination changing means includes a bottom 21a of a cylindrical member 5a obtained by deforming the cylindrical member 5 in the first embodiment, and a thin band-shaped first elastic member 42 having a biasing force directed radially outward. , And a second elastic member 43 that urges the first elastic member 42 radially inward. The first and second elastic members 42 and 43 are made of, for example, stainless steel, and the same as those known as a top foil and a bump foil (back foil) constituting a foil bearing can be applied.

底部２１ａは、冷却油が筒状部材５ａの内側に流入する流入孔であって、それぞれ４個ずつ設けられた第１流入孔４４及び第２流入孔４５と、第２流入孔４５の径方向外側に、回転軸３と同心円状に設けられ、閉塞端からサイドカバー１１側へ突出した第１突出部４６と、回転軸３に接する位置において回転軸３と同心円状に設けられ、閉塞端からサイドカバー１１側へ突出した第２突出部４７と、閉塞端のサイドカバー１１側に閉塞端から離間して配置され、第１流入孔４４と第２流入孔４５との間において閉塞端に対向する位置に回転軸３と同心状に設けられた環状部材４１とを備え、環状部材４１は第２突出部４７から径方向外側方向へ延びる支持部４１ａによって支持されている。 The bottom portion 21a is an inflow hole through which the cooling oil flows into the inside of the tubular member 5a, and the first inflow hole 44 and the second inflow hole 45 provided in four each, and the radial direction of the second inflow hole 45 On the outside, a first protruding portion 46 provided concentrically with the rotating shaft 3 and protruding from the closed end toward the side cover 11, and provided concentrically with the rotating shaft 3 at a position in contact with the rotating shaft 3, from the closed end A second protruding portion 47 protruding toward the side cover 11 is disposed on the side cover 11 side of the closed end away from the closed end, and faces the closed end between the first inflow hole 44 and the second inflow hole 45. An annular member 41 provided concentrically with the rotating shaft 3 is provided at a position where the annular member 41 is provided. The annular member 41 is supported by a support portion 41 a extending radially outward from the second projecting portion 47.

第１弾性部材４２は、第１突出部４６の径方向内側において回転軸３を囲む位置に、回転速度が高くなるほど遠心力によって実質的な直径が増加可能に配設されている。第２弾性部材４３は、第１弾性部材４２と第１突出部４６との間に配設されている。第２流入孔４５は第１流入孔４４の径方向外側に配置されるとともに、第１弾性部材４２は第２流入孔４５を閉塞可能な厚みを有する。 The first elastic member 42 is disposed at a position radially inward of the first protrusion 46 so as to surround the rotating shaft 3 so that the substantial diameter can be increased by the centrifugal force as the rotation speed increases. The second elastic member 43 is provided between the first elastic member 42 and the first protrusion 46. The second inflow hole 45 is disposed radially outward of the first inflow hole 44, and the first elastic member 42 has a thickness capable of closing the second inflow hole 45.

回転電機１の低速運転状態では図３に示すように、第１弾性部材４２が環状部材４１と閉塞端との間隙を閉塞し、中速運転状態では図４に示すように第１弾性部材４２が第２流入孔４５を閉塞し、高速運転状態では図５に示すように第１弾性部材４２が第２流入孔４５の径方向外側に位置するように、第１及び第２弾性部材４２，４３の付勢力が設定されている。なお、図３（ａ）において第１弾性部材４２は、環状部材４１によって見えない部分が太い破線で示されている。また図５（ａ）においては第２弾性部材４３は破線で示されている。 In the low-speed operation state of the rotating electric machine 1, as shown in FIG. 3, the first elastic member 42 closes the gap between the annular member 41 and the closed end, and in the medium-speed operation state, as shown in FIG. Closes the second inflow hole 45, and in the high-speed operation state, the first and second elastic members 42, 42 are positioned such that the first elastic member 42 is positioned radially outside the second inflow hole 45 as shown in FIG. Forty-three biasing forces are set. Note that, in FIG. 3A, a portion of the first elastic member 42 that is not visible by the annular member 41 is indicated by a thick broken line. In FIG. 5A, the second elastic member 43 is indicated by a broken line.

以上ような構成によれば、低速運転状態では図３（ｂ）に矢線で示すように、冷却油が主として第１流入孔４４を介して永久磁石６の取り付け部に供給され、高速運転状態では図５（ｂ）に矢線で示すように、冷却油が主として第２流入孔４５を介して永久磁石６の取り付け部に供給され、中速運転状態では図４（ｂ）に矢線で示すように、冷却油が主として第１弾性部材４２を迂回してステータ８の巻線８ａに供給される。その結果、低速運転状態及び高速運転状態において永久磁石６の冷却を促進し、中速運転状態ではステータ巻線８ａの冷却を促進するという回転速度に応じた冷却要求を満たすことができる。 According to the above configuration, in the low-speed operation state, as shown by the arrow in FIG. 3B, the cooling oil is mainly supplied to the mounting portion of the permanent magnet 6 through the first inflow hole 44, and the high-speed operation state 5B, the cooling oil is mainly supplied to the mounting portion of the permanent magnet 6 through the second inflow hole 45, as indicated by the arrow in FIG. 5B. As shown, the cooling oil is mainly supplied to the winding 8 a of the stator 8 bypassing the first elastic member 42. As a result, it is possible to satisfy the cooling demand according to the rotation speed, which promotes the cooling of the permanent magnet 6 in the low-speed operation state and the high-speed operation state, and promotes the cooling of the stator winding 8a in the medium-speed operation state.

本実施形態では、筒状部材５ａの底部２１ａに設けられた第１及び第２突出部４６，４７と、第１及び第２流入孔４４，４５と、環状部材４１と、第１及び第２弾性部材４２，４３とによって、供給先変更手段が構成される。 In this embodiment, the first and second protrusions 46 and 47 provided on the bottom 21a of the tubular member 5a, the first and second inflow holes 44 and 45, the annular member 41, the first and second The elastic members 42 and 43 constitute a supply destination changing unit.

なお、上述した実施形態では底部２１または２１ａに設ける流入孔２２，２３等の数は「４」としたが、これに限るものではなく、必要とされる冷却効果に応じて適宜変更可能である。 In the above-described embodiment, the number of the inflow holes 22, 23 provided in the bottom portion 21 or 21a is "4". However, the number is not limited thereto, and can be appropriately changed according to a required cooling effect. .

１回転電機
２ケーシング
３回転軸
５筒状部材
６永久磁石
７ロータ本体
８ステータ
８ａ巻線
１１サイドカバー
１２冷却油通路
２１，２１ａ底部
２２第１流入孔
２３第２流入孔
２４第１突出部
２５第２突出部
２６第３突出部
２７第３流入孔
２８冷却油通路
４１環状部材
４２第１弾性部材
４３第２弾性部材
４４第１流入孔
４５第２流入孔
４６第１突出部
４７第２突出部 REFERENCE SIGNS LIST 1 rotating electric machine 2 casing 3 rotating shaft 5 cylindrical member 6 permanent magnet 7 rotor body 8 stator 8a winding 11 side cover 12 cooling oil passage 21, 21a bottom 22 first inflow hole 23 second inflow hole 24 first protrusion 25 Second protruding portion 26 Third protruding portion 27 Third inflow hole 28 Cooling oil passage 41 Annular member 42 First elastic member 43 Second elastic member 44 First inflow hole 45 Second inflow hole 46 First protruding portion 47 Second protruding portion Department

Claims

A stator fixed to the casing and generating a magnetic flux; a rotating shaft rotatably supported by the casing; and a rotor fixed to the rotating shaft inside the stator and rotated by a magnetic flux generated by the stator. A rotating electric machine,
The rotor is a cylindrical member having a closed end and an open end, a cylindrical member fixed to the rotation shaft on the closed end side, and a permanent magnet attached to an outer peripheral portion of the cylindrical member. Prepare,
Cooling oil supply means for supplying cooling oil to the closed end of the tubular member,
A supply destination changing means provided at the closed end, for changing a main supply destination of the cooling oil according to a rotation speed of the rotor,
The supply destination changing means is provided at a bottom portion that closes the closed end, and first and second inflow holes through which the cooling oil flows into the inside of the tubular member; and the first and second inflow holes of the bottom portion. First and second projections provided concentrically with the rotation shaft and projecting from the closed end toward the cooling oil supply means at a radially outer side of the hole; the first projection and the second projection; A third protruding portion provided concentrically with the rotating shaft and protruding from the closed end toward the cooling oil supply means, and a third inflow hole provided radially inward of the third protruding portion. A cooling oil passage that passes through the inside of the bottom from the third inflow hole and opens radially outside the bottom.
The second inflow hole is disposed radially outward of the first inflow hole, and the amount of protrusion of the third protrusion is greater than the amount of protrusion of the first protrusion, and the amount of protrusion of the second protrusion is The amount is greater than the amount of protrusion of the third protrusion;
In the low-speed operation state in which the rotation speed is relatively low, and in the high-speed operation state in which the rotation speed is relatively high, the cooling oil is supplied toward the mounting portion of the permanent magnet, mainly inside the tubular member, A rotating electric machine that supplies the cooling oil mainly to the windings of the stator in a medium-speed operation state in which the rotation speed is a rotation speed between the low-speed operation state and the high-speed operation state.

A stator fixed to the casing and generating a magnetic flux; a rotating shaft rotatably supported by the casing; and a rotor fixed to the rotating shaft inside the stator and rotated by a magnetic flux generated by the stator. A rotating electric machine,
The rotor is a cylindrical member having a closed end and an open end, a cylindrical member fixed to the rotation shaft on the closed end side, and a permanent magnet attached to an outer peripheral portion of the cylindrical member. Prepare,
Cooling oil supply means for supplying cooling oil to the closed end of the tubular member,
A supply destination changing means provided at the closed end, for changing a main supply destination of the cooling oil according to a rotation speed of the rotor,
The supply destination changing means includes a bottom portion for closing the closed end, a thin band-shaped first elastic member having a biasing force radially outward, and a second biasing portion for biasing the first elastic member radially inward. 2 elastic members,
The bottom portion includes first and second inflow holes through which the cooling oil flows into the inside of the tubular member, and radially outside the second inflow hole, provided concentrically with the rotation shaft, and the closed end. A first protruding portion that protrudes toward the cooling oil supply means side from a second end, and a second protruding portion that is provided concentrically with the rotation shaft at a position in contact with the rotation shaft and protrudes from the closed end toward the cooling oil supply means side And the cooling oil supply means side of the closed end is spaced apart from the closed end, and is concentric with the rotating shaft at a position facing the closed end between the first inflow hole and the second inflow hole. Annular member provided in a shape, the annular member is supported by a support portion extending radially outward from the second protrusion,
The first elastic member is disposed radially inward of the first protruding portion at a position surrounding the rotation axis so that the substantial diameter can be increased as the rotation speed increases, and the second elastic member is Disposed between the first elastic member and the first protrusion,
The second inflow hole is arranged radially outward of the first inflow hole, and the first elastic member has a thickness capable of closing the second inflow hole,
In the low-speed operation state, the first elastic member closes a gap between the annular member and the closed end, and in the medium-speed operation state, the first elastic member closes the second inflow hole, and the high-speed operation state The biasing force of the first and second elastic members is set so that the first elastic member is located radially outside the second inflow hole .
In the low-speed operation state in which the rotation speed is relatively low, and in the high-speed operation state in which the rotation speed is relatively high, the cooling oil is supplied toward the mounting portion of the permanent magnet, mainly inside the tubular member, rotary electric machine you characterized by supplying the cooling oil in the medium-speed driving state is a rotational speed, mainly toward the winding of the stator between the rotational speed and the low speed driving state and the high-speed operation state.