JP6079733B2 - Rotating electrical machine rotor - Google Patents

Rotating electrical machine rotor Download PDF

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JP6079733B2
JP6079733B2 JP2014179437A JP2014179437A JP6079733B2 JP 6079733 B2 JP6079733 B2 JP 6079733B2 JP 2014179437 A JP2014179437 A JP 2014179437A JP 2014179437 A JP2014179437 A JP 2014179437A JP 6079733 B2 JP6079733 B2 JP 6079733B2
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rotor
path
axial direction
refrigerant
magnet
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JP2016054608A (en
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服部　宏之
宏之 服部
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Toyota Motor Corp
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Toyota Motor Corp
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Priority to US14/749,041 priority patent/US9793783B2/en
Priority to CN201510358307.3A priority patent/CN105281456B/en
Priority to EP15174007.3A priority patent/EP2961043B1/en
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Description

本発明は、回転電機のロータに関し、特にその冷却構造に関する。   The present invention relates to a rotor of a rotating electrical machine, and more particularly to a cooling structure thereof.

下記特許文献１の回転電機のロータでは、ロータシャフト内からの冷却油をロータコア内に形成した複数の冷却油路に供給することで磁石の冷却を行い、冷却油をロータ外周面とステータ間の空隙へ排出している。   In the rotor of the rotating electrical machine described in Patent Document 1, the magnet is cooled by supplying cooling oil from the rotor shaft to a plurality of cooling oil passages formed in the rotor core, and the cooling oil is supplied between the rotor outer peripheral surface and the stator. It is discharged into the gap.

特開２００６−６７７７７号公報JP 2006-67777 A 特開２００８−２２８５２２号公報JP 2008-228522 A 特開２００８−２２８５２３号公報JP 2008-228523 A 特開２０１３−１３１８２号公報JP2013-13182A

特許文献１では、複数の冷却油路のそれぞれが磁石の冷却に寄与するものの、ロータ外周面とステータ間の空隙への冷却油路出口が軸方向において複数箇所に形成され、冷却油が軸方向の複数箇所から空隙へ流出する。軸方向において冷却油路出口間に挟まれた領域では、冷却油が干渉し滞留しやすくなる。その結果、空隙に滞留する冷却油がロータの回転抵抗となって引き摺り損失が増加する。   In Patent Document 1, although each of the plurality of cooling oil passages contributes to cooling of the magnet, cooling oil passage outlets to the gap between the rotor outer peripheral surface and the stator are formed at a plurality of locations in the axial direction, and the cooling oil is axially directed. Out of multiple locations in the gap. In the region sandwiched between the cooling oil passage outlets in the axial direction, the cooling oil easily interferes and stays. As a result, the cooling oil staying in the gap becomes the rotational resistance of the rotor and drag loss increases.

本発明は、ロータ磁石の冷却性能を向上させつつ引き摺り損失を低減することを目的とする。   An object of the present invention is to reduce drag loss while improving the cooling performance of a rotor magnet.

本発明に係る回転電機のロータは、上述した目的を達成するために以下の手段を採った。   The rotor of the rotating electrical machine according to the present invention employs the following means in order to achieve the above-described object.

本発明に係る回転電機のロータは、内周側にロータシャフトが固定され、外周側にステータが空隙を空けて対向配置される回転電機のロータであって、ロータコアと、軸方向に沿ってロータコアに配設された磁石とを備え、ロータコアには、ロータシャフト内に形成された軸内冷媒路から液体冷媒が流入する冷媒流入路と、冷媒流入路から液体冷媒が供給され、軸方向に延びる磁石冷却路と、磁石冷却路からの液体冷媒をステータとの間の空隙へ流出させるための冷媒流出路と、が形成され、ロータコアにおいて、冷媒流出路が形成されている軸方向位置は、軸方向略中央位置の１面であることを要旨とする。   A rotor of a rotating electrical machine according to the present invention is a rotor of a rotating electrical machine in which a rotor shaft is fixed on an inner peripheral side and a stator is disposed opposite to the outer peripheral side with a gap between the rotor core and the rotor core along the axial direction. The rotor core is provided with a refrigerant inflow path through which liquid refrigerant flows from an in-axis refrigerant path formed in the rotor shaft, and the liquid refrigerant is supplied from the refrigerant inflow path and extends in the axial direction. A magnet cooling path and a refrigerant outflow path for allowing the liquid refrigerant from the magnet cooling path to flow into the gap between the stator and the stator are formed. In the rotor core, the axial position where the refrigerant outflow path is formed is The gist is that it is one surface in the approximate center of the direction.

本発明の一態様では、磁石冷却路は、冷媒流入路に連通し、軸方向に延びる第１磁石冷却路と、冷媒流出路に連通し、軸方向に延びる第２磁石冷却路と、を有し、第１磁石冷却路と第２磁石冷却路が連通路を介して連通し、連通路の軸方向位置が、冷媒流入路の軸方向位置及び冷媒流出路の軸方向位置より軸方向外側であることが好適である。   In one aspect of the present invention, the magnet cooling path includes a first magnet cooling path that communicates with the refrigerant inflow path and extends in the axial direction, and a second magnet cooling path that communicates with the refrigerant outflow path and extends in the axial direction. The first magnet cooling path and the second magnet cooling path communicate with each other through the communication path, and the axial position of the communication path is axially outside the axial position of the refrigerant inflow path and the axial position of the refrigerant outflow path. Preferably it is.

本発明の一態様では、ロータコアにおいて、冷媒流入路が形成されている軸方向位置は、軸方向略中央位置の１面であることが好適である。   In one aspect of the present invention, in the rotor core, it is preferable that the axial position where the refrigerant inflow passage is formed is one surface at a substantially central position in the axial direction.

本発明の一態様では、第２磁石冷却路の径方向位置が、第１磁石冷却路の径方向位置より径方向外側であることが好適である。   In one aspect of the present invention, it is preferable that the radial position of the second magnet cooling path is radially outside the radial position of the first magnet cooling path.

本発明の一態様では、ロータコアにおいては、貫通孔が形成された第１コアプレートが軸方向に複数積層され、積層された複数の第１コアプレートにおいて、軸方向に繋がる複数の貫通孔により磁石冷却路が形成されることが好適である。   In one aspect of the present invention, in the rotor core, a plurality of first core plates in which through holes are formed are stacked in the axial direction, and in the plurality of stacked first core plates, the plurality of through holes connected in the axial direction are magnets. A cooling path is preferably formed.

本発明の一態様では、ロータコアにおいては、冷媒流出路が形成された第２コアプレートの軸方向両側を第１コアプレートで挟んでいることが好適である。   In one aspect of the present invention, in the rotor core, it is preferable that both axial sides of the second core plate in which the refrigerant outflow path is formed are sandwiched between the first core plates.

本発明によれば、ロータとステータ間の空隙における冷却油の滞留を防止することができ、ロータ回転時の引き摺り損失を低減することができる。そして、ロータの磁石を軸方向全体に渡って冷却することができ、磁石の冷却性能を向上させることができる。   According to the present invention, stagnation of cooling oil in the gap between the rotor and the stator can be prevented, and drag loss during rotor rotation can be reduced. And the magnet of a rotor can be cooled over the whole axial direction, and the cooling performance of a magnet can be improved.

本発明の実施形態に係るロータ２０の構成例を示す横断面図である。It is a transverse cross section showing the example of composition of rotor 20 concerning the embodiment of the present invention. 図１のＸ−Ｘ線に相当する回転電機の断面図である。It is sectional drawing of the rotary electric machine equivalent to the XX line of FIG. 第１コアプレート３１の構成例を示す図である。FIG. 3 is a diagram illustrating a configuration example of a first core plate 31. 第２コアプレート３２の構成例を示す図である。FIG. 4 is a diagram illustrating a configuration example of a second core plate 32. 第３コアプレート３３の構成例を示す図である。It is a figure which shows the structural example of the 3rd core plate. 第４コアプレート３４の構成例を示す図である。It is a figure which shows the structural example of the 4th core plate. 冷媒流出路４３を軸方向において複数面に形成した場合における冷却油の流れを説明する図である。It is a figure explaining the flow of the cooling oil in case the refrigerant outflow path 43 is formed in multiple surfaces in the axial direction.

以下、本発明を実施するための形態（以下実施形態という）を図面に従って説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

図１〜６は、本発明の実施形態に係るロータ２０を備える回転電機の概略構成を示す図である。図１はロータ２０の横断面図を示し、図２は図１のＸ−Ｘ線に相当する回転電機の断面図を示し、図３〜６はロータコア２１を構成するコアプレート３１〜３４の構成例を示す。図１，３〜６では、周方向に関してロータ２０の構成の一部を図示しているが、図示を省略している残りの部分の構成は、図示している部分と同様の構成である。   1-6 is a figure which shows schematic structure of a rotary electric machine provided with the rotor 20 which concerns on embodiment of this invention. 1 shows a cross-sectional view of the rotor 20, FIG. 2 shows a cross-sectional view of a rotating electrical machine corresponding to the XX line of FIG. 1, and FIGS. 3 to 6 show the configurations of core plates 31 to 34 constituting the rotor core 21. An example is shown. In FIGS. 1 and 3 to 6, a part of the configuration of the rotor 20 is illustrated in the circumferential direction, but the configuration of the remaining portion, which is not illustrated, is the same configuration as the illustrated portion.

回転電機において、ロータ２０の外周側にはステータ１０が配置され、ロータ２０とステータ１０が径方向に空隙（磁気的ギャップ）Ｇを空けて対向配置されている。ステータ１０は、ステータコア１１と、ステータコア１１に配設されたコイル１２とを含む。ロータ２０は、ロータコア２１と、周方向に互いに間隔をおいて（等間隔で）ロータコア２１に配設された複数の磁極２２とを含む。ロータコア２１の内周側にはシャフト嵌合穴３０が軸方向に沿って形成され、ロータシャフト１６がシャフト嵌合穴３０に例えば圧入等により嵌められることで、ロータシャフト１６がロータ２０に固定される。ロータシャフト１６はベアリング（図示せず）等を介してケース（図示せず）に回転自在に支持され、ロータ２０がロータシャフト１６とともにステータ１０に対し回転自在となっている。   In the rotating electrical machine, the stator 10 is disposed on the outer peripheral side of the rotor 20, and the rotor 20 and the stator 10 are disposed to face each other with a gap (magnetic gap) G in the radial direction. The stator 10 includes a stator core 11 and a coil 12 disposed on the stator core 11. The rotor 20 includes a rotor core 21 and a plurality of magnetic poles 22 arranged on the rotor core 21 at intervals (equal intervals) in the circumferential direction. A shaft fitting hole 30 is formed along the axial direction on the inner peripheral side of the rotor core 21, and the rotor shaft 16 is fitted into the shaft fitting hole 30 by press fitting or the like, so that the rotor shaft 16 is fixed to the rotor 20. The The rotor shaft 16 is rotatably supported by a case (not shown) via a bearing (not shown) or the like, and the rotor 20 is rotatable with respect to the stator 10 together with the rotor shaft 16.

複数の磁極２２の各々においては、磁石挿入孔２３ａ，２３ｂがロータコア２１に軸方向に沿って形成され、永久磁石２２ａ，２２ｂが磁石挿入孔２３ａ，２３ｂに軸方向に沿って挿入されていることでロータコア２１内に埋設されている。一対の永久磁石２２ａ，２２ｂにより１つの磁極２２が構成される。図１の例では、永久磁石２２ａ，２２ｂの磁化方向が径方向に対し周方向に傾斜し、周方向において磁極２２の両端部が中央部より径方向外側に位置するように、永久磁石２２ａ，２２ｂがＶ字状に配置されている。ただし、永久磁石２２ａ，２２ｂ（磁石挿入孔２３ａ，２３ｂ）の形状はＶ字状以外であってもよい。ロータ２０において、図１に示すように、各磁極２２の周方向中央位置（Ｖ字の谷位置）を通る磁石磁束の方向をｄ軸（磁束軸）とし、周方向に隣接する磁極２２間の位置（ｄ軸と電気角で９０°ずれた位置）をｑ軸（トルク軸）とする。   In each of the plurality of magnetic poles 22, magnet insertion holes 23a and 23b are formed in the rotor core 21 along the axial direction, and permanent magnets 22a and 22b are inserted in the magnet insertion holes 23a and 23b along the axial direction. And embedded in the rotor core 21. One magnetic pole 22 is comprised by a pair of permanent magnets 22a and 22b. In the example of FIG. 1, the permanent magnets 22a and 22b are magnetized so that the magnetization directions thereof are inclined in the circumferential direction with respect to the radial direction, and both end portions of the magnetic pole 22 are positioned radially outward from the central portion in the circumferential direction. 22b is arranged in a V shape. However, the shape of the permanent magnets 22a and 22b (magnet insertion holes 23a and 23b) may be other than the V shape. In the rotor 20, as shown in FIG. 1, the direction of the magnetic flux passing through the circumferential center position (V-shaped valley position) of each magnetic pole 22 is a d-axis (flux axis), and between the magnetic poles 22 adjacent in the circumferential direction. The position (position shifted by 90 ° in electrical angle from the d axis) is defined as the q axis (torque axis).

ロータシャフト１６及びロータコア２１には、ロータ２０及びステータ１０を冷却するための液体冷媒が通る冷媒流路が形成されている。冷媒流路は、ロータシャフト１６内に形成された軸内冷媒路１７と、ロータコア２１内に形成されたコア内冷媒路とに大別される。軸内冷媒路１７は、ロータシャフト１６の軸心を通る穴である。軸内冷媒路１７は、図２に示すように、ロータシャフト１６の一端から、ロータシャフト１６のほぼ中央まで延びた後、径方向に分岐し、ロータコア２１の内周端まで延びる。   The rotor shaft 16 and the rotor core 21 are formed with a refrigerant flow path through which a liquid refrigerant for cooling the rotor 20 and the stator 10 passes. The refrigerant flow path is roughly divided into an in-axis refrigerant path 17 formed in the rotor shaft 16 and an in-core refrigerant path formed in the rotor core 21. The in-shaft refrigerant path 17 is a hole that passes through the axis of the rotor shaft 16. As shown in FIG. 2, the in-shaft refrigerant path 17 extends from one end of the rotor shaft 16 to substantially the center of the rotor shaft 16, then branches in the radial direction, and extends to the inner peripheral end of the rotor core 21.

コア内冷媒路は、冷媒流入路４０と第１磁石冷却路４１ａ，４１ｂと第２磁石冷却路４２ａ，４２ｂと連通路４４ａ，４４ｂと冷媒流出路４３とを有する。冷媒流入路４０は、ロータコア２１の内周端から磁極２２（永久磁石２２ａ，２２ｂ）より内周側の位置まで径方向に延びて形成され、冷媒流入路４０の径方向内側端部が軸内冷媒路１７に連通する。図１の例では、複数（磁極２２と同数）の冷媒流入路４０が周方向に互いに間隔をおいて（等間隔で）形成され、各冷媒流入路４０の周方向位置が各磁極２２の中央位置に相当する。つまり、各冷媒流入路４０がｄ軸に沿って延びている。   The in-core refrigerant path includes a refrigerant inflow path 40, first magnet cooling paths 41 a and 41 b, second magnet cooling paths 42 a and 42 b, communication paths 44 a and 44 b, and a refrigerant outflow path 43. The refrigerant inflow passage 40 is formed to extend in the radial direction from the inner peripheral end of the rotor core 21 to a position on the inner peripheral side from the magnetic pole 22 (permanent magnets 22a, 22b), and the radially inner end of the refrigerant inflow passage 40 is in the shaft. It communicates with the refrigerant path 17. In the example of FIG. 1, a plurality (the same number as the magnetic poles 22) of refrigerant inflow passages 40 are formed at regular intervals (equally spaced) in the circumferential direction, and the circumferential position of each refrigerant inflow passage 40 is the center of each magnetic pole 22. Corresponds to position. That is, each refrigerant inflow passage 40 extends along the d axis.

冷媒流出路４３は、磁極２２より内周側の位置からロータコア２１の外周端まで径方向に延びて形成され、冷媒流出路４３の径方向外側端部がロータ２０とステータ１０間の空隙Ｇに連通する。図１の例では、複数（磁極２２と同数）の冷媒流出路４３が周方向に互いに間隔をおいて（等間隔で）形成され、各冷媒流出路４３の周方向位置が周方向に隣接する磁極２２間の位置に相当する。つまり、各冷媒流出路４３は、ｑ軸に沿って延びており、冷媒流入路４０に対し周方向にずれて形成されている。   The refrigerant outflow passage 43 is formed so as to extend in the radial direction from the position on the inner peripheral side of the magnetic pole 22 to the outer peripheral end of the rotor core 21, and the radially outer end of the refrigerant outflow passage 43 forms a gap G between the rotor 20 and the stator 10. Communicate. In the example of FIG. 1, a plurality (the same number as the magnetic poles 22) of refrigerant outflow passages 43 are formed at regular intervals (equal intervals) in the circumferential direction, and the circumferential positions of the refrigerant outflow passages 43 are adjacent in the circumferential direction. This corresponds to the position between the magnetic poles 22. That is, each refrigerant outflow passage 43 extends along the q axis and is formed so as to be shifted in the circumferential direction with respect to the refrigerant inflow passage 40.

第１及び第２磁石冷却路４１ａ，４２ａは、永久磁石２２ａと対応して同数設けられ、永久磁石２２ａより内周側の位置に形成されている。第１及び第２磁石冷却路４１ａ，４２ａは永久磁石２２ａと平行に軸方向に沿って延びており、軸方向及び永久磁石２２ａの磁化方向と垂直な永久磁石２２ａの幅方向において第１磁石冷却路４１ａと第２磁石冷却路４２ａが互いに間隔を空けて配置されている。第１磁石冷却路４１ａは第２磁石冷却路４２ａよりｄ軸に近い側に配置され、第１磁石冷却路４１ａの径方向位置が第２磁石冷却路４２ａの径方向位置より径方向内側となる。同様に、第１及び第２磁石冷却路４１ｂ，４２ｂも、永久磁石２２ｂより内周側の位置で永久磁石２２ｂと平行に軸方向に沿って延びている。軸方向及び永久磁石２２ｂの磁化方向と垂直な永久磁石２２ｂの幅方向において第１磁石冷却路４１ｂと第２磁石冷却路４２ｂが互いに間隔を空けて配置され、第１磁石冷却路４１ｂが第２磁石冷却路４２ｂよりｄ軸に近い側に配置され、第１磁石冷却路４１ｂの径方向位置が第２磁石冷却路４２ｂの径方向位置より径方向内側となる。   The same number of first and second magnet cooling paths 41a and 42a are provided corresponding to the permanent magnets 22a, and are formed at positions on the inner peripheral side of the permanent magnets 22a. The first and second magnet cooling paths 41a and 42a extend along the axial direction in parallel with the permanent magnet 22a, and the first magnet cooling path is in the axial direction and the width direction of the permanent magnet 22a perpendicular to the magnetization direction of the permanent magnet 22a. The path 41a and the second magnet cooling path 42a are arranged with a space therebetween. The first magnet cooling path 41a is disposed closer to the d-axis than the second magnet cooling path 42a, and the radial position of the first magnet cooling path 41a is radially inward from the radial position of the second magnet cooling path 42a. . Similarly, the first and second magnet cooling paths 41b and 42b also extend along the axial direction in parallel with the permanent magnet 22b at a position on the inner peripheral side of the permanent magnet 22b. The first magnet cooling path 41b and the second magnet cooling path 42b are spaced apart from each other in the axial direction and the width direction of the permanent magnet 22b perpendicular to the magnetization direction of the permanent magnet 22b, and the first magnet cooling path 41b is the second. It is arranged closer to the d-axis than the magnet cooling path 42b, and the radial position of the first magnet cooling path 41b is radially inward from the radial position of the second magnet cooling path 42b.

連通路４４ａは、永久磁石２２ａと対応して同数設けられ、永久磁石２２ａより内周側の位置に形成されている。連通路４４ａの径方向位置は、第１磁石冷却路４１ａの径方向位置と第２磁石冷却路４２ａの径方向位置と一部重なる位置である。同様に、連通路４４ｂも永久磁石２２ａより内周側の位置に形成され、連通路４４ｂの径方向位置が第１磁石冷却路４１ｂの径方向位置と第２磁石冷却路４２ｂの径方向位置と一部重なる位置である。   The same number of communication paths 44a are provided corresponding to the permanent magnets 22a, and are formed at positions on the inner peripheral side of the permanent magnets 22a. The radial position of the communication path 44a is a position that partially overlaps the radial position of the first magnet cooling path 41a and the radial position of the second magnet cooling path 42a. Similarly, the communication path 44b is also formed at a position on the inner peripheral side of the permanent magnet 22a, and the radial position of the communication path 44b is the radial position of the first magnet cooling path 41b and the radial position of the second magnet cooling path 42b. It is a position that overlaps partially.

図２に示すように、第１磁石冷却路４１ａ，４１ｂの軸方向内側端部は冷媒流入路４０の径方向外側端部に連通する。第２磁石冷却路４２ａ，４２ｂの軸方向内側端部は冷媒流出路４３の径方向内側端部に連通する。第１磁石冷却路４１ａの軸方向外側端部は連通路４４ａに連通し、第２磁石冷却路４２ａの軸方向外側端部も連通路４４ａに連通する。これによって、第１磁石冷却路４１ａと第２磁石冷却路４２ａが連通路４４ａを介して連通する。同様に、第１及び第２磁石冷却路４１ｂ，４２ｂの軸方向外側端部が連通路４４ｂに連通することで、第１磁石冷却路４１ｂと第２磁石冷却路４２ｂが連通路４４ｂを介して連通する。   As shown in FIG. 2, the axially inner ends of the first magnet cooling paths 41 a and 41 b communicate with the radially outer end of the refrigerant inflow path 40. The axially inner ends of the second magnet cooling paths 42 a and 42 b communicate with the radially inner end of the refrigerant outflow path 43. The axially outer end of the first magnet cooling path 41a communicates with the communication path 44a, and the axially outer end of the second magnet cooling path 42a also communicates with the communication path 44a. Thus, the first magnet cooling path 41a and the second magnet cooling path 42a communicate with each other via the communication path 44a. Similarly, the axially outer ends of the first and second magnet cooling paths 41b and 42b communicate with the communication path 44b, so that the first magnet cooling path 41b and the second magnet cooling path 42b are connected via the communication path 44b. Communicate.

ロータコア２１は、図３〜６に示すような複数種類のコアプレート（電磁鋼板）３１〜３４を軸方向に積層して構成される。磁石挿入孔２３ａ，２３ｂは、すべてのコアプレート３１〜３４に形成されている。第１コアプレート３１においては、図３に示すように、第１及び第２貫通孔５１ａ，５２ａが磁石挿入孔２３ａより内周側の位置に形成され、第１及び第２貫通孔５１ｂ，５２ｂが磁石挿入孔２３ｂより内周側の位置に形成されている。図３の例では、第１及び第２貫通孔５１ａ，５２ａは、永久磁石２２ａの幅方向を長手方向とするスリット形状であり、第１及び第２貫通孔５１ｂ，５２ｂは、永久磁石２２ｂの幅方向を長手方向とするスリット形状である。軸方向に積層された複数の第１コアプレート３１において、複数の第１貫通孔５１ａが軸方向に繋がることで第１磁石冷却路４１ａが形成され、複数の第２貫通孔５２ａが軸方向に繋がることで第２磁石冷却路４２ａが形成される。同様に、複数の第１貫通孔５１ｂが軸方向に繋がることで第１磁石冷却路４１ｂが形成され、複数の第２貫通孔５２ｂが軸方向に繋がることで第２磁石冷却路４２ｂが形成される。第１コアプレート３１には、冷媒流入路４０と連通路４４ａ，４４ｂと冷媒流出路４３は形成されていない。   The rotor core 21 is configured by laminating a plurality of types of core plates (magnetic steel plates) 31 to 34 as shown in FIGS. The magnet insertion holes 23a and 23b are formed in all the core plates 31 to 34. In the first core plate 31, as shown in FIG. 3, the first and second through holes 51a, 52a are formed at positions on the inner peripheral side from the magnet insertion hole 23a, and the first and second through holes 51b, 52b are formed. Is formed at a position on the inner peripheral side from the magnet insertion hole 23b. In the example of FIG. 3, the first and second through holes 51a and 52a have a slit shape whose longitudinal direction is the width direction of the permanent magnet 22a, and the first and second through holes 51b and 52b are formed of the permanent magnet 22b. It is a slit shape whose longitudinal direction is the width direction. In the plurality of first core plates 31 stacked in the axial direction, the plurality of first through holes 51a are connected in the axial direction to form the first magnet cooling path 41a, and the plurality of second through holes 52a in the axial direction. By being connected, the second magnet cooling path 42a is formed. Similarly, the first magnet cooling path 41b is formed by connecting the plurality of first through holes 51b in the axial direction, and the second magnet cooling path 42b is formed by connecting the plurality of second through holes 52b in the axial direction. The In the first core plate 31, the refrigerant inflow path 40, the communication paths 44 a and 44 b, and the refrigerant outflow path 43 are not formed.

第２コアプレート３２には、図４に示すように、複数の冷媒流入路（スロット）４０と複数の冷媒流出路（スロット）４３が形成され、第１貫通孔５１ａ，５１ｂ（第１磁石冷却路４１ａ，４１ｂ）、第２貫通孔５２ａ，５２ｂ（第２磁石冷却路４２ａ，４２ｂ）、及び連通路４４ａ，４４ｂは形成されていない。図４の例では、冷媒流入路４０の径方向外側端部は、第１磁石冷却路４１ａ，４１ｂに繋がるよう周方向に広がった形状となっており、冷媒流出路４３の径方向内側端部は、第２磁石冷却路４２ａ，４２ｂに繋がるよう周方向に広がった形状となっている。   As shown in FIG. 4, a plurality of refrigerant inflow passages (slots) 40 and a plurality of refrigerant outflow passages (slots) 43 are formed in the second core plate 32, and the first through holes 51 a and 51 b (first magnet cooling) are formed. The passages 41a and 41b), the second through holes 52a and 52b (second magnet cooling passages 42a and 42b), and the communication passages 44a and 44b are not formed. In the example of FIG. 4, the radially outer end of the refrigerant inflow passage 40 has a shape extending in the circumferential direction so as to be connected to the first magnet cooling passages 41 a and 41 b, and the radially inner end of the refrigerant outflow passage 43. Has a shape that expands in the circumferential direction so as to be connected to the second magnet cooling paths 42a, 42b.

第３コアプレート３３には、図５に示すように、複数の連通路（連通孔）４４ａ，４４ｂが形成され、冷媒流入路４０、冷媒流出路４３、第１貫通孔５１ａ，５１ｂ、及び第２貫通孔５２ａ，５２ｂは形成されていない。図５の例では、連通孔４４ａは、永久磁石２２ａの幅方向を長手方向とするスリット形状であり、連通孔４４ｂは、永久磁石２２ｂの幅方向を長手方向とするスリット形状である。また、第４コアプレート３４には、図６に示すように、冷媒流入路４０、冷媒流出路４３、第１貫通孔５１ａ，５１ｂ、第２貫通孔５２ａ，５２ｂ、及び連通路４４ａ，４４ｂは形成されていない。   As shown in FIG. 5, the third core plate 33 is formed with a plurality of communication passages (communication holes) 44a and 44b, a refrigerant inflow passage 40, a refrigerant outflow passage 43, first through holes 51a and 51b, and The two through holes 52a and 52b are not formed. In the example of FIG. 5, the communication hole 44a has a slit shape whose longitudinal direction is the width direction of the permanent magnet 22a, and the communication hole 44b is a slit shape whose longitudinal direction is the width direction of the permanent magnet 22b. Further, as shown in FIG. 6, the fourth core plate 34 includes a refrigerant inflow passage 40, a refrigerant outflow passage 43, first through holes 51a and 51b, second through holes 52a and 52b, and communication passages 44a and 44b. Not formed.

ロータコア２１においては、図２に示すように、軸方向の一方側から他方側へ、第４コアプレート３４、第３コアプレート３３、複数の第１コアプレート３１、第２コアプレート３２、複数の第１コアプレート３１、第３コアプレート３３、第４コアプレート３４の順に積層されている。第２コアプレート３２はロータコア２１の軸方向中央位置に配置され、軸方向中央位置の第２コアプレート３２を挟んで、複数の第１コアプレート３１、第３コアプレート３３、及び第４コアプレート３４が対称に積層されている。   In the rotor core 21, as shown in FIG. 2, from one side in the axial direction to the other side, a fourth core plate 34, a third core plate 33, a plurality of first core plates 31, a second core plate 32, a plurality of The first core plate 31, the third core plate 33, and the fourth core plate 34 are stacked in this order. The second core plate 32 is disposed at the axial center position of the rotor core 21, and the plurality of first core plates 31, third core plates 33, and fourth core plates sandwiching the second core plate 32 at the axial center position. 34 are stacked symmetrically.

ロータコア２１においては、第２コアプレート３２が積層された軸方向位置は、軸方向中央位置の１面（１箇所）だけである。つまり、冷媒流出路４３は周方向に複数設けられているが、その軸方向位置はロータコア２１の軸方向中央位置の１面（１箇所）だけである。同様に、冷媒流入路４０も周方向に複数設けられているが、その軸方向位置はロータコア２１の軸方向中央位置の１面（１箇所）だけである。   In the rotor core 21, the axial position where the second core plate 32 is laminated is only one surface (one place) at the axial center position. That is, a plurality of refrigerant outflow passages 43 are provided in the circumferential direction, but the axial position is only one surface (one place) of the axial center position of the rotor core 21. Similarly, a plurality of refrigerant inflow passages 40 are provided in the circumferential direction, but the axial position is only one surface (one place) of the axial center position of the rotor core 21.

第２コアプレート３２の軸方向一方側及び他方側（軸方向両側）には複数の第１コアプレート３１が積層され、軸方向において第２コアプレート３２の両側を第１コアプレート３１で挟んでいる。その際には、第２コアプレート３２の冷媒流入路４０と最も軸方向内側の第１コアプレート３１の第１貫通孔５１ａ，５１ｂが軸方向に繋がり、第２コアプレート３２の冷媒流出路４３と最も軸方向内側の第１コアプレート３１の第２貫通孔５２ａ，５２ｂが軸方向に繋がる。そして、第１磁石冷却路４１ａ，４１ｂが冷媒流入路４０の軸方向両側に形成され、第２磁石冷却路４２ａ，４２ｂが冷媒流出路４３の軸方向両側に形成される。   A plurality of first core plates 31 are stacked on one side and the other side (both sides in the axial direction) of the second core plate 32, and both sides of the second core plate 32 are sandwiched between the first core plates 31 in the axial direction. Yes. At that time, the refrigerant inflow passage 40 of the second core plate 32 and the first through holes 51a and 51b of the first core plate 31 on the innermost side in the axial direction are connected in the axial direction, and the refrigerant outflow passage 43 of the second core plate 32 is connected. The second through holes 52a and 52b of the first core plate 31 on the innermost side in the axial direction are connected in the axial direction. The first magnet cooling paths 41 a and 41 b are formed on both axial sides of the refrigerant inflow path 40, and the second magnet cooling paths 42 a and 42 b are formed on both axial sides of the refrigerant outflow path 43.

積層された第１コアプレート３１の軸方向外側には第３コアプレート３３が積み重ねられ、軸方向において第３コアプレート３３と第２コアプレート３２間に複数の第１コアプレート３１を挟んでいる。その際には、第３コアプレート３３の連通路４４ａと最も軸方向外側の第１コアプレート３１の第１及び第２貫通孔５１ａ，５２ａが軸方向に繋がり、第３コアプレート３３の連通路４４ｂと最も軸方向外側の第１コアプレート３１の第１及び第２貫通孔５１ｂ，５２ｂが軸方向に繋がる。連通路４４ａ，４４ｂの軸方向位置は、冷媒流入路４０の軸方向位置及び冷媒流出路４３の軸方向位置より軸方向外側であり、軸方向において、冷媒流入路４０と連通路４４ａ，４４ｂ間に第１磁石冷却路４１ａ，４１ｂが形成され、冷媒流出路４３と連通路４４ａ，４４ｂ間に第２磁石冷却路４２ａ，４２ｂが形成される。第３コアプレート３３の軸方向外側には第４コアプレート３４が積み重ねられ、軸方向において第４コアプレート３４が最も外側に位置する。連通路４４ａ，４４ｂはロータコア２１の軸方向両端部に形成される。   A third core plate 33 is stacked outside the stacked first core plates 31 in the axial direction, and a plurality of first core plates 31 are sandwiched between the third core plate 33 and the second core plate 32 in the axial direction. . At that time, the communication path 44 a of the third core plate 33 and the first and second through holes 51 a and 52 a of the first core plate 31 that is outermost in the axial direction are connected in the axial direction, and the communication path of the third core plate 33 is connected. 44b and the first and second through holes 51b, 52b of the first axially outermost first core plate 31 are connected in the axial direction. The axial positions of the communication paths 44a and 44b are axially outside the axial position of the refrigerant inflow path 40 and the axial position of the refrigerant outflow path 43, and in the axial direction, between the refrigerant inflow path 40 and the communication paths 44a and 44b. The first magnet cooling paths 41a and 41b are formed, and the second magnet cooling paths 42a and 42b are formed between the refrigerant outflow path 43 and the communication paths 44a and 44b. The fourth core plate 34 is stacked outside the third core plate 33 in the axial direction, and the fourth core plate 34 is located on the outermost side in the axial direction. The communication passages 44 a and 44 b are formed at both axial ends of the rotor core 21.

ロータシャフト１６内の軸内冷媒路１７には、液体冷媒としての冷却油が供給される。ロータ回転時の遠心力によって、軸内冷媒路１７内の冷却油はロータコア２１の軸方向中央位置の冷媒流入路４０に流入する。冷媒流入路４０に流入した冷却油は、冷媒流入路４０の軸方向両側に形成された第１磁石冷却路４１ａ，４１ｂに供給され、図２の矢印ａに示すように、第１磁石冷却路４１ａ，４１ｂ内を軸方向外側へ流れる。さらに、第１磁石冷却路４１ａ，４１ｂ内の冷却油は、ロータコア２１の軸方向両端部の連通路４４ａ，４４ｂを通って第２磁石冷却路４２ａ，４２ｂに流入し、図２の矢印ｂに示すように、第２磁石冷却路４２ａ，４２ｂ内を軸方向内側へ流れる。第１磁石冷却路４１ａ，４１ｂ及び第２磁石冷却路４２ａ，４２ｂ内を冷却油が軸方向に往復して流れることで、永久磁石２２ａ，２２ｂの冷却が行われる。第２磁石冷却路４２ａ，４２ｂ内の冷却油は、冷媒流出路４３に向かって軸方向内側へ流れ、図２の矢印ｃに示すように、ロータコア２１の軸方向中央位置の冷媒流出路４３を通ってロータ２０とステータ１０間の空隙Ｇへ放出される。冷却油が空隙Ｇ内を流れることで、ロータコア２１の外周面及びステータ１０（コイル１２）の冷却も行うことができる。空隙Ｇ内の冷却油は、空隙Ｇの軸方向両端部から外部へ排出される。   Cooling oil as a liquid refrigerant is supplied to the in-axis refrigerant path 17 in the rotor shaft 16. The cooling oil in the in-axis refrigerant path 17 flows into the refrigerant inflow path 40 at the axial center position of the rotor core 21 due to the centrifugal force during the rotation of the rotor. The cooling oil that has flowed into the refrigerant inflow path 40 is supplied to first magnet cooling paths 41a and 41b formed on both sides in the axial direction of the refrigerant inflow path 40, and as shown by the arrow a in FIG. It flows in the axial direction outside through 41a and 41b. Further, the cooling oil in the first magnet cooling passages 41a and 41b flows into the second magnet cooling passages 42a and 42b through the communication passages 44a and 44b at both axial end portions of the rotor core 21, and is indicated by an arrow b in FIG. As shown, the second magnet cooling passages 42a and 42b flow inward in the axial direction. The cooling oil flows back and forth in the axial direction in the first magnet cooling paths 41a and 41b and the second magnet cooling paths 42a and 42b, thereby cooling the permanent magnets 22a and 22b. The cooling oil in the second magnet cooling passages 42a and 42b flows axially inward toward the refrigerant outflow passage 43, and passes through the refrigerant outflow passage 43 at the axial center position of the rotor core 21 as shown by an arrow c in FIG. It is discharged through the gap G between the rotor 20 and the stator 10. As the cooling oil flows through the gap G, the outer peripheral surface of the rotor core 21 and the stator 10 (coil 12) can also be cooled. The cooling oil in the gap G is discharged to the outside from both axial ends of the gap G.

ここで、冷媒流出路４３が軸方向において複数箇所に形成され、冷却油が軸方向の複数箇所から空隙Ｇへ流出する場合を考えると、図７の矢印ｄに示すように、軸方向に隣接する冷媒流出路４３間に挟まれた領域では、各冷媒流出路４３からの冷却油の軸方向流れが互いに干渉することで、冷却油が滞留しやすくなって空隙Ｇの軸方向両端部からの排出が阻害される。その結果、空隙Ｇに滞留する冷却油がロータの回転抵抗となって引き摺り損失が増加する。   Here, considering the case where the refrigerant outflow passages 43 are formed at a plurality of locations in the axial direction and the cooling oil flows out from the plurality of locations in the axial direction into the gap G, as shown by an arrow d in FIG. In the region sandwiched between the refrigerant outflow passages 43, the axial flow of the cooling oil from the refrigerant outflow passages 43 interferes with each other, so that the cooling oil tends to stay and the gap G from both ends in the axial direction. Emission is inhibited. As a result, the cooling oil staying in the gap G becomes the rotational resistance of the rotor and drag loss increases.

これに対して本実施形態では、冷媒流出路４３が軸方向においてロータコア２１の中央位置の１面（１箇所）だけに形成され、冷却油がロータコア２１の軸方向中央位置の１面（１箇所）だけから空隙Ｇへ流出する。これによって、空隙Ｇにおける冷却油の軸方向流れは、図２の矢印ｃに示すように、中央位置から両端部へ向かう軸方向外側だけの流れとなり、冷却油の軸方向流れの干渉を防止することができる。そのため、冷却油が空隙Ｇに滞留することなく、空隙Ｇの軸方向両端部から外部へ速やかに排出することができる。その結果、ロータ回転時の引き摺り損失を低減することができる。   On the other hand, in the present embodiment, the refrigerant outflow passage 43 is formed only on one surface (one location) at the center position of the rotor core 21 in the axial direction, and the cooling oil is disposed on one surface (one location) in the axial center position of the rotor core 21. ) Flows out into the gap G only from. As a result, the axial flow of the cooling oil in the gap G becomes a flow only in the axially outward direction from the center position toward both ends as shown by the arrow c in FIG. 2, and interference of the axial flow of the cooling oil is prevented. be able to. Therefore, the cooling oil can be quickly discharged from both axial ends of the gap G to the outside without staying in the gap G. As a result, drag loss during rotor rotation can be reduced.

そして、ロータコア２１の軸方向両端部間を軸方向に延びる第１及び第２磁石冷却路４１ａ，４１ｂ，４２ａ，４２ｂに冷却油を流すことで、永久磁石２２ａ，２２ｂを軸方向全体に渡って冷却することができ、永久磁石２２ａ，２２ｂの冷却性能を向上させることができる。その際に、冷却油は第２磁石冷却路４２ａ，４２ｂ内に滞留することなく、図２の矢印ｂに示すように軸方向両端部の連通路４４ａ，４４ｂから軸方向中央部の冷媒流出路４３へ向けて軸方向内側に速やかに流れる。さらに、冷媒流入路４０が軸方向においてロータコア２１の中央位置の１面（１箇所）だけに形成され、冷却油がロータコア２１の軸方向中央位置の１面（１箇所）だけから第１磁石冷却路４１ａ，４１ｂに流入する。これによって、冷却油は第１磁石冷却路４１ａ，４１ｂ内に滞留することなく、図２の矢印ａに示すように軸方向中央部の冷媒流入路４０から軸方向両端部の連通路４４ａ，４４ｂへ向けて軸方向外側に速やかに流れる。   And by flowing cooling oil to the 1st and 2nd magnet cooling path 41a, 41b, 42a, 42b extended in the axial direction between the axial direction both ends of the rotor core 21, permanent magnet 22a, 22b is extended over the whole axial direction. It can cool and can improve the cooling performance of permanent magnet 22a, 22b. At this time, the cooling oil does not stay in the second magnet cooling passages 42a and 42b, and the refrigerant outflow passages in the axial central portion from the communication passages 44a and 44b at both axial end portions as shown by arrows b in FIG. It quickly flows inward in the axial direction toward 43. Furthermore, the refrigerant inflow path 40 is formed only on one surface (one location) at the center position of the rotor core 21 in the axial direction, and the cooling oil is cooled by the first magnet only from one surface (one location) at the center position in the axial direction of the rotor core 21. It flows into the paths 41a and 41b. As a result, the cooling oil does not stay in the first magnet cooling paths 41a and 41b, and the communication paths 44a and 44b at both ends in the axial direction from the refrigerant inflow path 40 at the central part in the axial direction as shown by the arrow a in FIG. Immediately flows outward in the axial direction.

さらに、図２の矢印ａ，ｂに示すように、第１磁石冷却路４１ａ，４１ｂ及び第２磁石冷却路４２ａ，４２ｂ内を冷却油が軸方向に往復して流れることで、永久磁石２２ａ，２２ｂの冷却性能をより向上させることができる。その際には、冷媒流出路４３に連通する第２磁石冷却路４２ａ，４２ｂの径方向位置を冷媒流入路４０に連通する第１磁石冷却路４１ａ，４１ｂの径方向位置より径方向外側にすることで、ロータ回転時の遠心力により冷却油を効率よく流すことができる。   Further, as indicated by arrows a and b in FIG. 2, the cooling oil flows back and forth in the first magnet cooling paths 41a and 41b and the second magnet cooling paths 42a and 42b in the axial direction, so that the permanent magnets 22a, The cooling performance of 22b can be further improved. At that time, the radial positions of the second magnet cooling paths 42 a and 42 b communicating with the refrigerant outflow path 43 are set radially outward from the radial positions of the first magnet cooling paths 41 a and 41 b communicating with the refrigerant inflow path 40. Thus, the cooling oil can be efficiently flowed by the centrifugal force when the rotor rotates.

また、図３，４に示すように、冷媒流入路４０、第１磁石冷却路４１ａ，４１ｂ、第２磁石冷却路４２ａ，４２ｂ、及び冷媒流出路４３がｄ軸磁路Ｌｄ及びｑ軸磁路Ｌｑを阻害することもないため、ｄ軸磁路Ｌｄ及びｑ軸磁路Ｌｑの磁気抵抗を低く抑えることができる。その結果、マグネットトルク及びリラクタンストルクの双方を有効に活用することができ、ロータ２０のトルクを有効に増加させることができる。   3 and 4, the refrigerant inflow path 40, the first magnet cooling paths 41a and 41b, the second magnet cooling paths 42a and 42b, and the refrigerant outflow path 43 are composed of a d-axis magnetic path Ld and a q-axis magnetic path. Since Lq is not inhibited, the magnetic resistance of the d-axis magnetic path Ld and the q-axis magnetic path Lq can be kept low. As a result, both the magnet torque and the reluctance torque can be effectively utilized, and the torque of the rotor 20 can be effectively increased.

以上の実施形態では、第２コアプレート３２をロータコア２１の軸方向中央位置に配置し、冷媒流出路４３をロータコア２１の軸方向中央位置に形成するものとした。ただし、本実施形態では、軸方向において、第２コアプレート３２をロータコア２１の中央位置から若干ずらした位置に配置し、冷媒流出路４３をロータコア２１の中央位置から若干ずらした位置に形成することも可能である。その場合でも、空隙Ｇにおける冷却油の軸方向流れの干渉を防止することが可能である。   In the above embodiment, the second core plate 32 is disposed at the axial center position of the rotor core 21, and the refrigerant outflow passage 43 is formed at the axial center position of the rotor core 21. However, in the present embodiment, in the axial direction, the second core plate 32 is disposed at a position slightly shifted from the center position of the rotor core 21, and the refrigerant outflow passage 43 is formed at a position slightly shifted from the center position of the rotor core 21. Is also possible. Even in that case, it is possible to prevent interference of the axial flow of the cooling oil in the gap G.

以上の実施形態では、冷媒流入路４０を第２コアプレート３２に形成してロータコア２１の軸方向中央位置に形成するものとした。ただし、本実施形態では、軸方向において第２コアプレート３２に隣接する第１コアプレート３１に冷媒流入路４０を形成する等して、軸方向において冷媒流入路４０をロータコア２１の中央位置から若干ずらした位置に形成することも可能である。   In the above embodiment, the refrigerant inflow passage 40 is formed in the second core plate 32 and formed at the axial center position of the rotor core 21. However, in the present embodiment, the refrigerant inflow passage 40 is slightly moved from the center position of the rotor core 21 in the axial direction by forming the refrigerant inflow passage 40 in the first core plate 31 adjacent to the second core plate 32 in the axial direction. It is also possible to form at shifted positions.

以上の実施形態では、ロータコア２１（第１コアプレート３１）に磁石冷却路として第１磁石冷却路４１ａ，４１ｂ及び第２磁石冷却路４２ａ，４２ｂを形成し、第１磁石冷却路４１ａ，４１ｂ及び第２磁石冷却路４２ａ，４２ｂ内に冷却油を軸方向に往復させて流すものとした。ただし、本実施形態では、磁石冷却路４１ａ，４１ｂ及び連通路４４ａ，４４ｂを省略することも可能であり、冷却油を軸方向に往復させないことも可能である。その場合の構成例としては、軸内冷媒路１７及び磁石冷却路４２ａ，４２ｂに連通する冷媒流入路４０を第３コアプレート３３（ロータコア２１の軸方向両端部）に形成する。ロータコア２１の軸方向両端部の冷媒流入路４０に流入した冷却油は、磁石冷却路４２ａ，４２ｂを内を軸方向内側へ流れ、ロータコア２１の軸方向中央位置の冷媒流出路４３を通ってロータ２０とステータ１０間の空隙Ｇへ放出される。   In the above embodiment, the first magnet cooling paths 41a and 41b and the second magnet cooling paths 42a and 42b are formed as the magnet cooling paths in the rotor core 21 (first core plate 31), and the first magnet cooling paths 41a and 41b and The cooling oil is reciprocated in the axial direction in the second magnet cooling paths 42a and 42b. However, in this embodiment, the magnet cooling paths 41a and 41b and the communication paths 44a and 44b can be omitted, and the cooling oil can be prevented from reciprocating in the axial direction. As a configuration example in that case, the refrigerant inflow path 40 communicating with the in-axis refrigerant path 17 and the magnet cooling paths 42a and 42b is formed in the third core plate 33 (both ends in the axial direction of the rotor core 21). The cooling oil that has flowed into the refrigerant inflow passages 40 at both axial ends of the rotor core 21 flows inward through the magnet cooling passages 42a and 42b, passes through the refrigerant outflow passage 43 at the axial center position of the rotor core 21, and the rotor. 20 is discharged into the gap G between the stator 10 and the stator 10.

以上、本発明を実施するための形態について説明したが、本発明はこうした実施形態に何等限定されるものではなく、本発明の要旨を逸脱しない範囲内において、種々なる形態で実施し得ることは勿論である。   As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to such embodiment at all, and it can implement with a various form in the range which does not deviate from the summary of this invention. Of course.

１０ ステータ、１１ ステータコア、１２ コイル、１６ ロータシャフト、１７ 軸内冷媒路、２０ ロータ、２１ ロータコア、２２ 磁極、２２ａ，２２ｂ 永久磁石、２３ａ，２３ｂ 磁石挿入孔、３０ シャフト嵌合穴、３１ 第１コアプレート、３２ 第２コアプレート、３３ 第３コアプレート、３４ 第４コアプレート、４０ 冷媒流入路、４１ａ，４１ｂ 第１磁石冷却路、４２ａ，４２ｂ 第２磁石冷却路、４３ 冷媒流出路、４４ａ，４４ｂ 連通路、５１ａ，５１ｂ 第１貫通孔、５２ａ，５２ｂ 第２貫通孔、Ｇ 空隙。   DESCRIPTION OF SYMBOLS 10 Stator, 11 Stator core, 12 Coil, 16 Rotor shaft, 17 In-axis refrigerant path, 20 Rotor, 21 Rotor core, 22 Magnetic pole, 22a, 22b Permanent magnet, 23a, 23b Magnet insertion hole, 30 Shaft fitting hole, 31 1st Core plate, 32 Second core plate, 33 Third core plate, 34 Fourth core plate, 40 Refrigerant inflow path, 41a, 41b First magnet cooling path, 42a, 42b Second magnet cooling path, 43 Refrigerant outflow path, 44a 44b Communication path, 51a, 51b 1st through-hole, 52a, 52b 2nd through-hole, G space | gap.

Claims (6)

内周側にロータシャフトが固定され、外周側にステータが空隙を空けて対向配置される回転電機のロータであって、
ロータコアと、軸方向に沿ってロータコアに配設された磁石とを備え、
ロータコアには、
ロータシャフト内に形成された軸内冷媒路から液体冷媒が流入する冷媒流入路と、
冷媒流入路から液体冷媒が供給され、軸方向に延びる磁石冷却路と、
磁石冷却路からの液体冷媒をステータとの間の空隙へ流出させるための冷媒流出路と、
が形成され、
ロータコアにおいて、冷媒流出路が形成されている軸方向位置は、軸方向略中央位置の１面である、回転電機のロータ。 A rotor of a rotating electrical machine in which a rotor shaft is fixed on the inner peripheral side and a stator is disposed opposite to the outer peripheral side with a gap,
A rotor core and a magnet disposed in the rotor core along the axial direction;
In the rotor core,
A refrigerant inflow path through which liquid refrigerant flows from an in-axis refrigerant path formed in the rotor shaft;
A magnet cooling path that is supplied with liquid refrigerant from the refrigerant inflow path and extends in the axial direction;
A refrigerant outflow path for allowing liquid refrigerant from the magnet cooling path to flow out into the gap between the stator and the magnet cooling path;
Formed,
In the rotor core, the rotor of the rotating electrical machine, wherein the axial position where the refrigerant outflow path is formed is one surface at a substantially central position in the axial direction. 請求項１に記載の回転電機のロータであって、
磁石冷却路は、
冷媒流入路に連通し、軸方向に延びる第１磁石冷却路と、
冷媒流出路に連通し、軸方向に延びる第２磁石冷却路と、
を有し、
第１磁石冷却路と第２磁石冷却路が連通路を介して連通し、
連通路の軸方向位置が、冷媒流入路の軸方向位置及び冷媒流出路の軸方向位置より軸方向外側である、回転電機のロータ。 The rotor of the rotating electrical machine according to claim 1,
The magnet cooling path is
A first magnet cooling passage communicating with the refrigerant inflow passage and extending in the axial direction;
A second magnet cooling path communicating with the refrigerant outflow path and extending in the axial direction;
Have
The first magnet cooling path and the second magnet cooling path communicate with each other through the communication path;
A rotor of a rotating electrical machine in which an axial position of a communication path is axially outer than an axial position of a refrigerant inflow path and an axial position of a refrigerant outflow path. 請求項２に記載の回転電機のロータであって、
ロータコアにおいて、冷媒流入路が形成されている軸方向位置は、軸方向略中央位置の１面である、回転電機のロータ。 The rotor of the rotating electrical machine according to claim 2,
In the rotor core, the rotor of the rotating electrical machine, wherein the axial position where the refrigerant inflow path is formed is one surface at a substantially central position in the axial direction. 請求項２または３に記載の回転電機のロータであって、
第２磁石冷却路の径方向位置が、第１磁石冷却路の径方向位置より径方向外側である、回転電機のロータ。 A rotor for a rotating electrical machine according to claim 2 or 3,
The rotor of a rotating electrical machine, wherein the radial position of the second magnet cooling path is radially outside the radial position of the first magnet cooling path. 請求項１〜４のいずれか１に記載の回転電機のロータであって、
ロータコアにおいては、貫通孔が形成された第１コアプレートが軸方向に複数積層され、
積層された複数の第１コアプレートにおいて、軸方向に繋がる複数の貫通孔により磁石冷却路が形成される、回転電機のロータ。 A rotor of a rotating electrical machine according to any one of claims 1 to 4,
In the rotor core, a plurality of first core plates in which through holes are formed are laminated in the axial direction,
A rotor of a rotating electrical machine in which a magnet cooling path is formed by a plurality of through holes connected in the axial direction in a plurality of stacked first core plates. 請求項５に記載の回転電機のロータであって、
ロータコアにおいては、冷媒流出路が形成された第２コアプレートの軸方向両側を第１コアプレートで挟んでいる、回転電機のロータ。 The rotor of the rotating electrical machine according to claim 5,
In a rotor core, a rotor of a rotating electrical machine in which both sides in the axial direction of a second core plate in which a refrigerant outflow path is formed are sandwiched between first core plates.
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