JP2018186612A - Rotary electric machine - Google Patents

Rotary electric machine Download PDF

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JP2018186612A
JP2018186612A JP2017086121A JP2017086121A JP2018186612A JP 2018186612 A JP2018186612 A JP 2018186612A JP 2017086121 A JP2017086121 A JP 2017086121A JP 2017086121 A JP2017086121 A JP 2017086121A JP 2018186612 A JP2018186612 A JP 2018186612A
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flow path
refrigerant
axial
radial flow
rotor
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JP6272526B1 (en
Inventor
翔也 溝上
Shoya Mizogami
翔也 溝上
学 義則
Manabu Yoshinori
学 義則
佳明 橘田
Yoshiaki Kitsuta
佳明 橘田
井上　正哉
Masaya Inoue
正哉 井上
裕輔 木本
Yusuke Kimoto
裕輔 木本
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Priority to CN201711474584.6A priority patent/CN108736603B/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of efficiently cooling a stator winding, a permanent magnet mounted on a rotor, and the like.SOLUTION: One axial end of a rotary shaft 11 is inserted into a coolant reservoir 8. An axial flow passage 20 is formed along an axial center line from one axial end to the other axial end of the rotary shaft 11. A refrigerant reservoir unit 22 is annularly formed by recessing a surface of a first end plate 15 which is in contact with a rotor core 12. A radial flow path 21 is connected perpendicularly to the axial flow passage 20 and opens to the outer peripheral surface of the rotary shaft 11 at an axial attachment position of the first end plate 15 and directly connected to the refrigerant reservoir unit 22. A throttle plug 23 is mounted on an outlet side of the radial flow path 21.SELECTED DRAWING: Figure 2

Description

この発明は、例えば電動機、発電機などの回転電機に関し、特に、回転子に装着された永久磁石の冷却構造に関するものである。   The present invention relates to a rotating electrical machine such as an electric motor or a generator, and more particularly to a cooling structure for a permanent magnet mounted on a rotor.

従来の回転電機では、回転軸の一端部より他端部近傍まで軸中心線に沿って設けられた第１の流路と、他端部近傍において第１の流路に設定される接続部で、第１の流路に対して略直交して接続され、回転軸の外周側に向かって開放された第２の流路と、を備え、第２の流路の流路断面積が、回転軸の外周側に向かって増大するように構成されていた（例えば、特許文献１参照）。   In a conventional rotating electrical machine, a first flow path provided along the axial center line from one end of the rotating shaft to the vicinity of the other end, and a connection portion set as the first flow path in the vicinity of the other end A second flow path that is connected substantially orthogonally to the first flow path and that is open toward the outer peripheral side of the rotating shaft, and the flow path cross-sectional area of the second flow path is rotated. It was comprised so that it might increase toward the outer peripheral side of a shaft (for example, refer to patent documents 1).

特許第６０３２０５６号公報Japanese Patent No. 6032056

従来の回転電機では、第２の流路の流路断面積が径方向外方に向かって漸次増大しているので、回転軸の回転が高速となるにつれて、第２の流路からの冷媒の放出量が増大し、第１の流路から第２の流路への冷媒の供給、すなわち第１の流路への冷媒の吸い込みが追いつかなくなる。このように、回転子の高速回転領域では、第１の流路への冷媒の吸い込み量が少なくなり、固定子巻線、回転子に装着された永久磁石などを効率よく冷却できなくなるという課題があった。   In the conventional rotating electrical machine, the flow passage cross-sectional area of the second flow passage gradually increases outward in the radial direction, so that the refrigerant flow from the second flow passage increases as the rotation speed of the rotation shaft increases. The discharge amount increases, and the supply of the refrigerant from the first flow path to the second flow path, that is, the suction of the refrigerant into the first flow path cannot catch up. Thus, in the high-speed rotation region of the rotor, the amount of refrigerant sucked into the first flow path is reduced, and the stator winding, the permanent magnet mounted on the rotor, and the like cannot be efficiently cooled. there were.

この発明は、このような課題を解決するためになされたものであり、固定子巻線、回転子に装着された永久磁石などを効率よく冷却できる回転電機を得ることを目的とする。   The present invention has been made to solve such a problem, and an object thereof is to obtain a rotating electrical machine capable of efficiently cooling a stator winding, a permanent magnet mounted on a rotor, and the like.

この発明による回転電機は、ハウジングと、上記ハウジングに保持された固定子と、上記ハウジングに回転可能に保持された回転軸に固着されて、上記固定子内に上記固定子と同軸に配設された回転子と、を備え、上記回転子は、上記回転軸に装着され、複数の磁石収納穴が、それぞれ、穴方向を軸方向として、軸方向の一端から他端に至るように形成されて、周方向に配列されている回転子鉄心と、上記複数の磁石収納穴のそれぞれに収納されている永久磁石と、上記回転子鉄心の軸方向の一端面に接する状態に上記回転軸に装着されて、上記複数の磁石収納穴を覆っている第１端板と、を備え、上記回転軸の軸方向の一端が内部に挿入されている冷媒貯留部と、上記回転軸の軸方向の一端から他端側に軸中心線に沿って形成された軸方向流路と、上記第１端板の上記回転子鉄心と接する面を凹ませて上記回転軸を取り囲む環状に形成され、上記複数の磁石収納穴の少なくとも１つが接続される冷媒溜まり部と、上記第１端板の軸方向の装着位置で、上記軸方向流路に対して直交して接続されて上記回転軸の外周面に開口し、上記冷媒溜まり部と直接、または上記第１端板の上記回転子鉄心と接する面を凹ませて形成された径方向に延びる連通路を介して接続される、少なくとも１つの径方向流路と、上記軸方向流路から上記冷媒溜まり部に至る流路のなかの少なくとも１つの流路の一部に形成された、流路断面積を縮小する絞り部と、を有する。   A rotating electrical machine according to the present invention is fixed to a housing, a stator held in the housing, and a rotating shaft rotatably held in the housing, and is disposed coaxially with the stator in the stator. The rotor is mounted on the rotating shaft, and a plurality of magnet housing holes are formed from one end to the other end in the axial direction with the hole direction as the axial direction. The rotor cores arranged in the circumferential direction, the permanent magnets housed in each of the plurality of magnet housing holes, and attached to the rotary shaft so as to be in contact with one end surface of the rotor core in the axial direction. A first end plate that covers the plurality of magnet housing holes, and a refrigerant storage portion in which one axial end of the rotating shaft is inserted, and one axial end of the rotating shaft Axial direction formed along the axis center line on the other end side A refrigerant reservoir portion that is formed in an annular shape surrounding the rotation shaft by recessing a surface of the first end plate that contacts the rotor core and to which at least one of the plurality of magnet housing holes is connected; At the mounting position in the axial direction of the one end plate, it is connected orthogonally to the axial flow path and opens to the outer peripheral surface of the rotating shaft, and directly with the refrigerant reservoir or the first end plate. At least one radial flow path connected through a radially extending communication path formed by denting the surface in contact with the rotor core, and a flow path extending from the axial flow path to the refrigerant reservoir And a throttle portion that is formed in a part of at least one of the channels and reduces the cross-sectional area of the channel.

この発明によれば、回転子の回数の上昇とともに、冷媒貯留部から軸方向流路への冷媒の吸い込み量が増加し、固定子巻線、回転子に装着された永久磁石などを効率よく冷却できる。   According to this invention, as the number of rotors increases, the amount of refrigerant sucked from the refrigerant reservoir into the axial flow path increases, and the stator windings, permanent magnets mounted on the rotor, and the like are efficiently cooled. it can.

この発明の実施の形態１に係る回転電機を示す断面図である。It is sectional drawing which shows the rotary electric machine which concerns on Embodiment 1 of this invention. この発明の実施の形態１に係る回転電機の要部を示す断面図である。It is sectional drawing which shows the principal part of the rotary electric machine which concerns on Embodiment 1 of this invention. この発明の実施の形態１に係る回転電機における冷媒の吸い込み量と回転子の回転数との関係を示す図である。It is a figure which shows the relationship between the amount of refrigerant | coolants sucked in the rotary electric machine which concerns on Embodiment 1 of this invention, and the rotation speed of a rotor. この発明の実施の形態２に係る回転電機の要部を示す断面図である。It is sectional drawing which shows the principal part of the rotary electric machine which concerns on Embodiment 2 of this invention. この発明の実施の形態３に係る回転電機の要部を示す断面図である。It is sectional drawing which shows the principal part of the rotary electric machine which concerns on Embodiment 3 of this invention. この発明の実施の形態４に係る回転電機の要部を示す断面図である。It is sectional drawing which shows the principal part of the rotary electric machine which concerns on Embodiment 4 of this invention. この発明の実施の形態５に係る回転電機における冷媒の吸い込み量と回転子の回転数との関係を示す図である。It is a figure which shows the relationship between the refrigerant | coolant suction amount and the rotation speed of a rotor in the rotary electric machine which concerns on Embodiment 5 of this invention.

以下、本発明による回転電機の好適な実施の形態につき図面を用いて説明する。   Hereinafter, preferred embodiments of a rotating electrical machine according to the present invention will be described with reference to the drawings.

実施の形態１．
図１はこの発明の実施の形態１に係る回転電機を示す断面図、図２はこの発明の実施の形態１に係る回転電機の要部を示す断面図である。なお、図１および図２において、Ａは回転軸の軸中心線である。 Embodiment 1 FIG.
1 is a cross-sectional view showing a rotary electric machine according to Embodiment 1 of the present invention, and FIG. 2 is a cross-sectional view showing a main part of the rotary electric machine according to Embodiment 1 of the present invention. In FIG. 1 and FIG. 2, A is the axis center line of the rotating shaft.

図１および図２において、回転電機１００は、ハウジング１と、ハウジング１内に配設された固定子２と、軸受５を介してハウジング１に回転可能に支持された回転軸１１に固着されて、固定子２の内周側に同軸に配設された回転子１０と、を備える。   1 and 2, the rotating electrical machine 100 is fixed to a housing 1, a stator 2 disposed in the housing 1, and a rotating shaft 11 that is rotatably supported by the housing 1 via a bearing 5. And the rotor 10 disposed coaxially on the inner peripheral side of the stator 2.

固定子２は、円環状の固定子鉄心３と、固定子鉄心３に装着された固定子巻線４と、を備える。   The stator 2 includes an annular stator core 3 and a stator winding 4 attached to the stator core 3.

回転子１０は、回転軸１１と、電磁鋼板を積層して構成され、その軸心位置を挿通する回転軸１１に固着された回転子鉄心１２と、磁極を構成する永久磁石１３と、とを備える。磁石収納穴１４が、それぞれ、穴方向を回転軸１１の軸方向と平行として、回転子鉄心１２の外周部に軸方向の一端から他端に至るように形成されて、周方向に等角ピッチで複数配設されている。永久磁石１３は、磁石収納穴１４のそれぞれに収納され、接着剤などにより固定されている。   The rotor 10 is configured by laminating a rotating shaft 11, electromagnetic steel plates, a rotor core 12 fixed to the rotating shaft 11 passing through the axial center position, and a permanent magnet 13 constituting a magnetic pole. Prepare. Magnet housing holes 14 are formed in the outer peripheral portion of the rotor core 12 so that the hole direction is parallel to the axial direction of the rotary shaft 11 so as to extend from one end to the other end in the axial direction, and at equal pitches in the circumferential direction. A plurality are arranged. The permanent magnet 13 is housed in each of the magnet housing holes 14 and fixed with an adhesive or the like.

第１端板１５および第２端板１６が、軸方向の両側から回転軸１１に圧入などにより装着、固定され、回転子鉄心１２の回転軸１１からの抜けを防止している。第１端板１５は、回転子鉄心１２より小径で、磁石収納穴１４を覆う円板状に作製されている。第２端板１６は、磁石収納穴１４を露出させる大きさの円板状に作製されている。   The first end plate 15 and the second end plate 16 are attached and fixed to the rotary shaft 11 from both sides in the axial direction by press fitting or the like, thereby preventing the rotor core 12 from coming off the rotary shaft 11. The first end plate 15 has a smaller diameter than the rotor core 12 and is formed in a disc shape covering the magnet housing hole 14. The 2nd end plate 16 is produced in the disk shape of the magnitude | size which exposes the magnet accommodation hole 14. FIG.

回転軸１１には、軸方向流路２０が、回転軸１１の軸心位置に、軸方向一端から第１端板１５の装着位置に至るまで軸中心線Ａに沿って形成されている。径方向流路２１が、それぞれ、第１端板１５の装着位置で、軸方向流路２０の底部から分岐して径方向外方に延びて回転軸１１の外周面に開口するように形成されて、周方向に等角ピッチで４本配設されている。なお、軸方向流路２０は、軸中心線Ａに沿って、軸方向一端から第１端板１５の装着位置を超えて形成されてもよい。   In the rotating shaft 11, an axial flow path 20 is formed at the axial center position of the rotating shaft 11 along the axial center line A from one end in the axial direction to the mounting position of the first end plate 15. The radial flow paths 21 are formed so as to branch from the bottom of the axial flow path 20 and extend radially outward at the mounting position of the first end plate 15 and open to the outer peripheral surface of the rotary shaft 11. The four are arranged at equiangular pitches in the circumferential direction. The axial flow path 20 may be formed along the axial center line A from the axial end to beyond the mounting position of the first end plate 15.

冷媒溜まり部２２が、第１端板１５の回転子鉄心１２に相対する面を環状に凹ませて形成されている。径方向流路２１は冷媒溜まり部２２に直接接続されている。磁石収納穴１４が、冷媒溜まり部２２内に開口している。円筒状の絞り栓２３が、径方向流路２１の外周側端部に圧入、固定されている。   The refrigerant reservoir 22 is formed by denting the surface of the first end plate 15 facing the rotor core 12 in an annular shape. The radial flow path 21 is directly connected to the refrigerant reservoir 22. A magnet housing hole 14 opens into the refrigerant reservoir 22. A cylindrical throttle plug 23 is press-fitted and fixed to the outer peripheral end of the radial flow path 21.

ハウジング１内の鉛直方向の上部には、冷媒分配部６が配設されている、冷媒分配部６の軸方向の一端側と他端側には、開口６ａ，６ｂが形成されている。冷媒流入ポート７から冷媒分配部６内に流入した冷媒としての冷却油は、開口６ａ，６ｂからハウジング１内に排出される。カバー２７が、回転子鉄心１２の軸方向の一端側のハウジング１の部位に取り付けられている。冷媒貯留部８が、ハウジング１とカバー２７とにより形成される。この冷媒貯留部８は、回転子鉄心１２の軸方向の一端側に、かつ回転軸１１の軸心位置に位置している。そして、回転軸１１の軸方向の一端部が、冷媒貯留部８内に挿入されている。さらに、ガイド部材９が、ハウジング１の回転子鉄心１２の軸方向の一端面と相対する内壁面と、回転子鉄心１２と、の間に配設され、開口６ａから排出された冷却油を冷媒貯留部８に案内する。   In the upper part of the housing 1 in the vertical direction, the refrigerant distribution part 6 is disposed, and openings 6a and 6b are formed on one end side and the other end side of the refrigerant distribution part 6 in the axial direction. The cooling oil as the refrigerant that has flowed into the refrigerant distributor 6 from the refrigerant inflow port 7 is discharged into the housing 1 through the openings 6a and 6b. A cover 27 is attached to a portion of the housing 1 on one end side in the axial direction of the rotor core 12. A refrigerant reservoir 8 is formed by the housing 1 and the cover 27. The refrigerant reservoir 8 is located on one end side in the axial direction of the rotor core 12 and at the axial center position of the rotary shaft 11. One end portion of the rotating shaft 11 in the axial direction is inserted into the refrigerant storage portion 8. Further, the guide member 9 is disposed between the inner wall surface of the housing 1 facing the one end surface in the axial direction of the rotor core 12 and the rotor core 12, and the cooling oil discharged from the opening 6a is used as a refrigerant. Guide to the reservoir 8.

このように構成された回転電機１００においては、冷却油が、冷媒流入ポート７から冷媒分配部６に供給される。冷媒分配部６に供給された冷却油は、開口６ａ，６ｂからハウジング１内に排出される。開口６ａから排出された冷却油は、ガイド部材９に受けられ、ガイド部材９に案内されて冷媒貯留部８に貯留される。冷媒貯留部８に貯留された冷媒は、軸方向流路２０を通って径方向流路２１のそれぞれに流入する。   In the rotating electrical machine 100 configured as described above, the cooling oil is supplied from the refrigerant inflow port 7 to the refrigerant distributor 6. The cooling oil supplied to the refrigerant distributor 6 is discharged into the housing 1 through the openings 6a and 6b. The cooling oil discharged from the opening 6 a is received by the guide member 9, guided by the guide member 9, and stored in the refrigerant storage portion 8. The refrigerant stored in the refrigerant storage unit 8 flows into the radial flow path 21 through the axial flow path 20.

ここで、回転電機１００が駆動されると、回転子１０が回転軸１１を回転中心として回転する。回転子１０の回転により、径方向流路２１の冷却油に遠心力が作用し、冷却油が冷媒溜まり部２２内に流出する。これにより、径方向流路２１内に負圧が発生し、冷却油が冷媒貯留部８から軸方向流路２０を介して径方向流路２１に流入する。このように、冷却油が冷媒貯留部８から軸方向流路２０に順次供給され、軸方向流路２０、径方向流路２１および冷媒溜まり部２２を通って磁石収納穴１４の一端側に流入し、磁石収納穴１４の他端からハウジング１内に放出される冷媒流通路が形成される。   Here, when the rotating electrical machine 100 is driven, the rotor 10 rotates about the rotation shaft 11 as a rotation center. The rotation of the rotor 10 causes a centrifugal force to act on the cooling oil in the radial flow path 21, and the cooling oil flows out into the refrigerant reservoir 22. As a result, a negative pressure is generated in the radial flow path 21, and the cooling oil flows from the refrigerant reservoir 8 into the radial flow path 21 via the axial flow path 20. Thus, the cooling oil is sequentially supplied from the refrigerant reservoir 8 to the axial flow path 20 and flows into the one end side of the magnet housing hole 14 through the axial flow path 20, the radial flow path 21 and the refrigerant reservoir 22. Thus, a refrigerant flow passage that is discharged into the housing 1 from the other end of the magnet housing hole 14 is formed.

このように構成された冷却機構では、冷媒分配部６内に流入した冷媒が開口６ｂからハウジング１内の軸方向他側に排出される。この開口６ｂから排出された冷媒が、軸方向他側に配設された軸受５に浴びせられ、この軸受５での発熱が放熱される。
冷媒が冷媒貯留部８から軸方向流路２０および径方向流路２１を流通することで、軸方向一端側の軸受５での発熱が放熱される。また、磁石収納穴１４内を流通する冷媒により、永久磁石１３での発熱が放熱される。さらに、磁石収納穴１４の他端からハウジング１内に排出された冷却油は、回転子１０の回転により、径方向外方に飛散し、固定子巻線４のコイルエンドに浴びせられ、固定子巻線４での発熱が放熱される。 In the cooling mechanism configured as described above, the refrigerant that has flowed into the refrigerant distributor 6 is discharged from the opening 6 b to the other axial side in the housing 1. The refrigerant discharged from the opening 6b is applied to the bearing 5 disposed on the other side in the axial direction, and the heat generated in the bearing 5 is radiated.
The refrigerant flows through the axial flow path 20 and the radial flow path 21 from the refrigerant storage section 8, so that heat generated at the bearing 5 on one axial end side is radiated. Further, the heat generated in the permanent magnet 13 is radiated by the refrigerant flowing through the magnet housing hole 14. Further, the cooling oil discharged into the housing 1 from the other end of the magnet housing hole 14 is scattered radially outward by the rotation of the rotor 10 and is bathed on the coil end of the stator winding 4. Heat generated in the winding 4 is dissipated.

つぎに、絞り栓２３による効果について説明する。ここで、軸方向流路２０、径方向流路２１および絞り栓２３は、それぞれ、一定の流路断面積を有している。そして、冷媒溜まり部２２の流路断面積をＳ１、軸方向流路２０の流路断面積をＳ２、径方向流路２１の流路断面積をＳ３、絞り栓２３の流路断面積をＳ４としたときに、Ｓ１＞Ｓ２＞Ｓ３＞Ｓ４となっている。また、全ての径方向流路２１に絞り栓２３が装着されている。絞り栓２３が絞り部となる。   Next, the effect of the throttle plug 23 will be described. Here, each of the axial flow path 20, the radial flow path 21, and the throttle plug 23 has a constant flow path cross-sectional area. The flow path cross-sectional area of the refrigerant reservoir 22 is S1, the cross-sectional area of the axial flow path 20 is S2, the cross-sectional area of the radial flow path 21 is S3, and the cross-sectional area of the throttle plug 23 is S4. S1> S2> S3> S4. Further, throttle plugs 23 are attached to all the radial flow paths 21. The throttle plug 23 becomes a throttle part.

本回転電機１００において、回転子１０の回転数を上昇して、冷媒貯留部８から軸方向流路２０への冷媒の吸い込み量を測定した結果を図３に示す。図３はこの発明の実施の形態１に係る回転電機における冷媒の吸い込み量と回転子の回転数との関係を示す図である。なお、図３において、Ｃ１は実施の形態１における冷媒の吸い込み量を示し、Ｃ２は比較例による冷媒の吸い込み量を示している。比較例による回転電機は、絞り栓２３が径方向流路２１のそれぞれに装着されていない点を除いて、回転電機１００と同様に構成されている。   In the rotary electric machine 100, the number of rotations of the rotor 10 is increased, and the result of measuring the amount of refrigerant sucked from the refrigerant reservoir 8 into the axial flow path 20 is shown in FIG. FIG. 3 is a diagram showing the relationship between the refrigerant suction amount and the rotor rotation speed in the rotary electric machine according to Embodiment 1 of the present invention. In FIG. 3, C1 indicates the refrigerant suction amount in the first embodiment, and C2 indicates the refrigerant suction amount according to the comparative example. The rotating electrical machine according to the comparative example is configured in the same manner as the rotating electrical machine 100 except that the throttle plug 23 is not attached to each of the radial flow paths 21.

図３のＣ１で示されるように、実施の形態１では、回転子１０の回転数が上昇するとともに、冷媒の吸い込み量が上昇した。一方、比較例では、図３のＣ２に示されるように、回転子１０の回転数が上昇するとともに、冷媒の吸い込み量が上昇し、回転子１０の回転数がＲ２を超えると、冷媒の吸い込み量が低下し、回転子の回転数がＲ３を超えると、冷媒の吸い込み量がほぼ一定となった。このように、回転子１０の回転数が高い領域では、絞り栓２３を装着した方が、冷媒の吸い込み量が多くなり、永久磁石１３や固定子巻線４を効率よく冷却できることがわかった。   As indicated by C1 in FIG. 3, in the first embodiment, the rotational speed of the rotor 10 is increased and the refrigerant suction amount is increased. On the other hand, in the comparative example, as shown in C2 of FIG. 3, when the rotational speed of the rotor 10 increases, the amount of refrigerant sucked increases, and when the rotational speed of the rotor 10 exceeds R2, the refrigerant sucked When the amount decreased and the rotation speed of the rotor exceeded R3, the refrigerant suction amount became almost constant. Thus, it was found that in the region where the rotational speed of the rotor 10 is high, the amount of refrigerant sucked increases when the throttle plug 23 is attached, and the permanent magnet 13 and the stator winding 4 can be efficiently cooled.

これは、比較例では、回転数が低い領域では、径方向流路２１の出口側での圧力の低下がなく、回転数が上昇するにしたがい、冷媒の吸い込み量が増加する。しかし、回転数がＲ２を超えると、軸方向流路２０を介しての径方向流路２１への供給量が径方向流路２１から冷媒溜まり部２２への流出量に追いつかなくなり、径方向流路２１の出口側での圧力が低下し、冷媒の吸い込み量が低下したものと推考される。
実施の形態１では、絞り栓２３により、径方向流路２１の出口側の流路断面積が小さく設定されている。そこで、回転子１０の回転数が上昇しても、径方向流路２１の出口側での圧力の低下が抑制されるので、回転子１０の回転数が上昇するほど、冷媒の吸い込む量が多くなったものと推考される。 This is because, in the comparative example, in the region where the rotational speed is low, the pressure on the outlet side of the radial flow path 21 does not decrease, and the amount of refrigerant sucked increases as the rotational speed increases. However, when the rotational speed exceeds R2, the supply amount to the radial flow path 21 via the axial flow path 20 cannot catch up with the outflow amount from the radial flow path 21 to the refrigerant reservoir 22, and the radial flow It is presumed that the pressure on the outlet side of the passage 21 has decreased and the refrigerant suction amount has decreased.
In the first embodiment, the restrictor plug 23 sets the outlet cross-sectional area of the radial passage 21 to be small. Therefore, even if the number of rotations of the rotor 10 increases, a decrease in pressure on the outlet side of the radial flow path 21 is suppressed, so that the amount of refrigerant sucked increases as the number of rotations of the rotor 10 increases. It is inferred that

このように、実施の形態１によれば、径方向流路２１の出口側に絞り栓２３が装着され、径方向流路２１の流路断面積が出口側で小さくなっている。これにより、回転子１０の回転数が上昇するほど、冷媒の吸い込む量が多くなるので、永久磁石１３を効率よく冷却でき、永久磁石１３の温度上昇を抑制できる。そこで、永久磁石１３の熱減磁を防止するために、耐熱性に優れた磁石材料を用いる必要がない。すなわち、磁石材料のグレードを下げることができ、低コスト化が図られる。
回転子１０を回転させることで、冷媒貯留部８内の冷却油を軸方向流路２０に吸い込ませることができるので、外部ポンプなどの動力が不要となり、低コスト化が図られる。
絞り栓２３を径方向流路２１に挿入して、絞り部を構成している。そこで、径方向流路２１を一定の流路断面積に形成できるので、回転軸１１の加工が容易となる。 Thus, according to Embodiment 1, the throttle plug 23 is attached to the outlet side of the radial flow path 21, and the flow path cross-sectional area of the radial flow path 21 is reduced on the outlet side. Thereby, since the amount of refrigerant sucked increases as the rotational speed of the rotor 10 increases, the permanent magnet 13 can be efficiently cooled, and the temperature increase of the permanent magnet 13 can be suppressed. Therefore, in order to prevent thermal demagnetization of the permanent magnet 13, it is not necessary to use a magnet material having excellent heat resistance. That is, the grade of the magnet material can be lowered and the cost can be reduced.
By rotating the rotor 10, the cooling oil in the refrigerant reservoir 8 can be sucked into the axial flow path 20, so that power such as an external pump becomes unnecessary and cost reduction is achieved.
The throttle plug 23 is inserted into the radial flow path 21 to constitute a throttle portion. Therefore, since the radial flow path 21 can be formed with a constant flow path cross-sectional area, processing of the rotating shaft 11 is facilitated.

実施の形態２．
図４はこの発明の実施の形態２に係る回転電機の要部を示す断面図である。 Embodiment 2. FIG.
4 is a cross-sectional view showing a main part of a rotating electrical machine according to Embodiment 2 of the present invention.

図４において、冷媒溜まり部２２が、第１端板１５の回転子鉄心１２に相対する面に、径方向流路２１から径方向に離間して環状に形成されている。連通路２４が、通路方向を径方向として、第１端板１５の回転子鉄心１２に相対する面に、径方向流路２１のそれぞれと冷媒溜まり部２２とを連通するように形成されている。そして、連通路２４が、径方向流路２１の流路断面積より小さい流路断面積に形成されており、絞り部を構成する。
なお、他の構成は上記実施の形態１と同様に構成されている。 In FIG. 4, the refrigerant reservoir 22 is formed in an annular shape on the surface of the first end plate 15 facing the rotor core 12, spaced radially from the radial flow path 21. The communication passage 24 is formed on the surface of the first end plate 15 facing the rotor core 12 with the passage direction as the radial direction so as to communicate each of the radial flow paths 21 and the refrigerant reservoir 22. . And the communicating path 24 is formed in the flow-path cross-sectional area smaller than the flow-path cross-sectional area of the radial direction flow path 21, and comprises a throttle part.
Other configurations are the same as those in the first embodiment.

実施の形態２では、連通路２４の流路断面積が径方向流路２１の流路断面積より小さくなっており、軸方向流路２０から冷媒溜まり部２２に至る冷媒流路の一部が狭められている。これにより、回転子１０の回転数が上昇しても、径方向流路２１の出口側での圧力の低下が抑制される。したがって、実施の形態２においても、上記実施の形態１と同様の効果が得られる。
実施の形態２によれば、絞り栓２３が不要となるので、部品点数が削減され、低コスト化が図られる。 In the second embodiment, the flow passage cross-sectional area of the communication passage 24 is smaller than the flow passage cross-sectional area of the radial flow passage 21, and a part of the refrigerant flow passage extending from the axial flow passage 20 to the refrigerant reservoir 22 is formed. It is narrowed. Thereby, even if the rotation speed of the rotor 10 rises, the pressure drop on the outlet side of the radial flow path 21 is suppressed. Therefore, also in the second embodiment, the same effect as in the first embodiment can be obtained.
According to the second embodiment, the stopper plug 23 is not necessary, so the number of parts is reduced and the cost can be reduced.

実施の形態３．
図５はこの発明の実施の形態３に係る回転電機の要部を示す断面図である。 Embodiment 3 FIG.
FIG. 5 is a cross-sectional view showing a main part of a rotating electrical machine according to Embodiment 3 of the present invention.

図５において、大径部２５が各径方向流路２１の出口側に形成されている。絞り栓２３が大径部２５に圧入、固定されている。
なお、他の構成は上記実施の形態１と同様に構成されている。 In FIG. 5, a large diameter portion 25 is formed on the outlet side of each radial flow path 21. A throttle plug 23 is press-fitted and fixed to the large-diameter portion 25.
Other configurations are the same as those in the first embodiment.

実施の形態３では、絞り栓２３が径方向流路２１の出口側に配設されているので、径方向流路２１の出口側の流路断面積が小さくなる。したがって、実施の形態３においても、上記実施の形態１と同様の効果が得られる。
実施の形態３によれば、絞り栓２３が径方向流路２１の出口側に形成された大径部２５に圧入、固定されている。そこで、大径部２５の加工精度を高めことで、絞り栓２３を大径部２５の底部に突き当たるまで挿入することで、絞り栓２３を所定の位置に高精度に設置できる。このように、絞り栓２３の設置位置の管理が不要となり、組立性を向上させることができる。また、絞り栓２３の固定力が消失しても、絞り栓２３が径方向流路２１内を軸心方向に移動することがなく、信頼性が向上される。 In Embodiment 3, since the throttle plug 23 is disposed on the outlet side of the radial flow path 21, the flow path cross-sectional area on the outlet side of the radial flow path 21 is reduced. Therefore, also in Embodiment 3, the same effect as in Embodiment 1 can be obtained.
According to the third embodiment, the throttle plug 23 is press-fitted and fixed to the large-diameter portion 25 formed on the outlet side of the radial flow path 21. Therefore, by increasing the processing accuracy of the large-diameter portion 25 and inserting the throttle plug 23 until it abuts against the bottom of the large-diameter portion 25, the throttle plug 23 can be installed at a predetermined position with high accuracy. Thus, management of the installation position of the throttle plug 23 becomes unnecessary, and the assemblability can be improved. Further, even if the fixing force of the throttle plug 23 disappears, the throttle plug 23 does not move in the axial direction in the radial flow path 21 and the reliability is improved.

なお、上記実施の形態１，３では、絞り栓が径方向流路に圧入固定されているが、絞り栓は径方向流路に挿入されて接着剤により固定されてもよい。   In the first and third embodiments, the throttle plug is press-fitted and fixed in the radial flow path. However, the throttle plug may be inserted into the radial flow path and fixed by an adhesive.

実施の形態４．
図６はこの発明の実施の形態４に係る回転電機の要部を示す断面図である。 Embodiment 4 FIG.
6 is a cross-sectional view showing a main part of a rotary electric machine according to Embodiment 4 of the present invention.

図６において、冷媒溜まり部２２が、第１端板１５の回転子鉄心１２に相対する面に、径方向流路２１から径方向に離間して環状に形成されている。連通路２４が、通路方向を径方向として、第１端板１５の回転子鉄心１２に相対する面に、径方向流路２１のそれぞれと冷媒溜まり部２２とを連通するように形成されている。突起２６が各連通路２４の内壁面に形成されている。ここで、連通路２４の流路断面積は、径方向流路２１の流路断面積以上となっている。突起２６の形成部における流路断面積が、径方向流路２１の流路断面積より小さくなっており、絞り部を構成する。
なお、他の構成は上記実施の形態１と同様に構成されている。 In FIG. 6, the refrigerant reservoir 22 is formed in an annular shape on the surface of the first end plate 15 facing the rotor core 12, spaced radially from the radial flow path 21. The communication passage 24 is formed on the surface of the first end plate 15 facing the rotor core 12 with the passage direction as the radial direction so as to communicate each of the radial flow paths 21 and the refrigerant reservoir 22. . A protrusion 26 is formed on the inner wall surface of each communication passage 24. Here, the flow path cross-sectional area of the communication path 24 is greater than or equal to the flow path cross-sectional area of the radial flow path 21. The flow passage cross-sectional area in the formation part of the protrusion 26 is smaller than the flow passage cross-sectional area of the radial flow path 21 and constitutes a throttle part.
Other configurations are the same as those in the first embodiment.

実施の形態４では、突起２６の形成部分の流路断面積が径方向流路２１の流路断面積より小さくなっており、軸方向流路２０から冷媒溜まり部２２に至る冷媒流路の一部が狭められている。したがって、実施の形態４においても、上記実施の形態１と同様の効果が得られる。
実施の形態４によれば、絞り栓２３が不要となるので、部品点数が削減され、低コスト化が図られる。 In the fourth embodiment, the flow passage cross-sectional area of the portion where the protrusion 26 is formed is smaller than the flow passage cross-sectional area of the radial flow passage 21, and one of the refrigerant flow passages extending from the axial flow passage 20 to the refrigerant reservoir 22. The part is narrowed. Therefore, also in the fourth embodiment, the same effect as in the first embodiment can be obtained.
According to the fourth embodiment, the stopper plug 23 is not necessary, so the number of parts is reduced and the cost can be reduced.

実施の形態５．
上記実施の形態１では、絞り栓２３が４つの径方向流路２１のそれぞれに装着されているが、実施の形態６では、絞り栓２３が３つの径方向流路２１のそれぞれに装着されている。
なお、他の構成は、実施の形態１と同様に構成されている。 Embodiment 5. FIG.
In the first embodiment, the throttle plug 23 is mounted on each of the four radial flow paths 21, but in the sixth embodiment, the throttle plug 23 is mounted on each of the three radial flow paths 21. Yes.
Other configurations are the same as those in the first embodiment.

このように構成された回転電機において、回転子１０の回転数を上昇して、冷媒貯留部８から軸方向流路２０への冷媒の吸い込み量を測定した結果を図７に示す。図７はこの発明の実施の形態５に係る回転電機における冷媒の吸い込み量と回転子の回転数との関係を示す図である。なお、図７において、Ｃ１は実施の形態１における冷媒の吸い込み量を示し、Ｃ３は実施の形態５における冷媒の吸い込み量を示している。   FIG. 7 shows the result of measuring the amount of refrigerant sucked from the refrigerant reservoir 8 into the axial flow path 20 by increasing the number of rotations of the rotor 10 in the rotating electric machine configured as described above. FIG. 7 is a diagram showing the relationship between the refrigerant suction amount and the rotational speed of the rotor in the rotary electric machine according to Embodiment 5 of the present invention. In FIG. 7, C1 indicates the refrigerant suction amount in the first embodiment, and C3 indicates the refrigerant suction amount in the fifth embodiment.

図７のＣ３で示されるように、実施の形態５では、回転子１０の回転数が上昇するとともに、冷媒の吸い込み量が上昇し、回転子１０の回転数がＲ４を超えると、冷媒の吸い込み量が低下し、回転子の回転数がＲ５を超えると、冷媒の吸い込み量が上昇した。   As shown by C3 in FIG. 7, in the fifth embodiment, when the rotational speed of the rotor 10 is increased and the refrigerant suction amount is increased, and the rotational speed of the rotor 10 exceeds R4, the refrigerant suction is performed. When the amount decreased and the rotor rotation speed exceeded R5, the refrigerant suction amount increased.

これは、回転数が低い領域では、絞り栓２３が装着されていない径方向流路２１から冷媒溜まり部２２への冷却油の放出量が、絞り栓２３が装着されている径方向流路２１から冷媒溜まり部２２への冷却油の放出量より多くなっている。すなわち、絞り栓２３が装着されていない径方向流路２１が存在することで、４本の径方向流路２１から冷媒溜まり部２２への冷却油の放出量が、実施の形態１より多くなる。そこで、実施の形態５では、冷却油の放出量の増大に追従して、軸方向流路２０への冷却油の吸い込み量が増大し、実施の形態１に比べて、多くなったものと推考される。   This is because, in the region where the rotational speed is low, the amount of cooling oil discharged from the radial flow path 21 where the throttle plug 23 is not mounted to the refrigerant reservoir 22 is the radial flow path 21 where the throttle plug 23 is mounted. The amount of cooling oil discharged from the refrigerant to the refrigerant reservoir 22 is larger. That is, the presence of the radial flow path 21 to which the restrictor plug 23 is not attached causes the amount of cooling oil discharged from the four radial flow paths 21 to the refrigerant reservoir 22 to be larger than that in the first embodiment. . Therefore, in the fifth embodiment, the amount of cooling oil sucked into the axial flow path 20 increases following the increase in the amount of cooling oil released, and it is assumed that the amount is larger than that in the first embodiment. Is done.

そして、回転数がＲ４を超えると、絞り栓２３が装着されていない径方向流路２１への冷媒の供給量が、当該径方向流路２１から冷媒溜まり部２２への流出量に追いつかなくなり、径方向流路２１の出口側での圧力が低下し、軸方向流路２０への冷媒の吸い込み量が低下したものと推考される。さらに、回転数がＲ５を超えると、絞り栓２３が装着されていない径方向流路２１への冷却油の供給量と絞り栓２３が装着されている径方向流路２１への冷却油の供給量とが同等となる。そこで、回転数の上昇とともに、冷媒の吸い込み量が、実施の形態１による冷媒の吸い込み量に近づくように上昇したものと推考される。   When the rotational speed exceeds R4, the supply amount of the refrigerant to the radial flow path 21 to which the throttle plug 23 is not attached cannot catch up with the outflow amount from the radial flow path 21 to the refrigerant reservoir portion 22, It is presumed that the pressure on the outlet side of the radial flow path 21 decreased, and the amount of refrigerant sucked into the axial flow path 20 decreased. Further, when the rotational speed exceeds R5, the supply amount of the cooling oil to the radial flow path 21 where the throttle plug 23 is not mounted and the supply of the cooling oil to the radial flow path 21 where the throttle plug 23 is mounted. The amount is equivalent. Therefore, it is presumed that as the rotational speed increases, the refrigerant suction amount increases so as to approach the refrigerant suction amount according to the first embodiment.

ここで、絞り栓２３を装着する径方向流路２１の個数を変えることで、吸い込み量の変曲点における回転数Ｒ４、Ｒ５が変わることが確認された。   Here, it was confirmed that the rotational speeds R4 and R5 at the inflection point of the suction amount change by changing the number of the radial flow paths 21 to which the throttle plugs 23 are attached.

このように、実施の形態５によれば、特定の回転数のときに、冷媒の吸い込み量が最大となるように、絞り栓２３が装着される径方向流路２１の個数を調節することができる。すなわち、特定の回転数のときに、固定子巻線４、永久磁石１３などを効果的に冷却することができるように回転電機を構成することはできる。   As described above, according to the fifth embodiment, the number of the radial flow paths 21 to which the throttle plugs 23 are attached can be adjusted so that the refrigerant suction amount becomes maximum at a specific rotation speed. it can. That is, the rotating electrical machine can be configured so that the stator winding 4, the permanent magnet 13, and the like can be effectively cooled at a specific rotational speed.

なお、上記実施の形態５では、実施の形態１における回転電機を用いて説明しているが、他の実施の形態による回転電機に用いても，同様の効果が得られる。   Although the fifth embodiment has been described using the rotating electrical machine according to the first embodiment, the same effect can be obtained by using the rotating electrical machine according to another embodiment.

また、上記各実施の形態では、冷媒溜まり部に接続する磁石収納穴の個数について特定していないが、必ずしも全ての磁石収納穴を冷媒溜まり部に接続する必要はなく、例えば、周方向の配列されている磁石収納穴を１つおきに冷媒溜まり部に接続してもよい。
また、上記各実施の形態では、４つの径方向流路を形成しているが、径方向流路の個数は４つ限定されず、冷却性能を考慮して、径方向流路の個数を適宜設定すればよい。 In each of the above embodiments, the number of magnet storage holes connected to the refrigerant reservoir is not specified, but it is not always necessary to connect all the magnet storage holes to the refrigerant reservoir, for example, an arrangement in the circumferential direction. Alternatively, every other magnet storage hole may be connected to the refrigerant reservoir.
In each of the above embodiments, four radial flow paths are formed. However, the number of radial flow paths is not limited to four, and the number of radial flow paths is appropriately determined in consideration of cooling performance. You only have to set it.

１ ハウジング、２ 固定子、８ 冷媒貯留部、９ ガイド部材、１０ 回転子、１１ 回転軸、１２ 回転子鉄心、１３ 永久磁石、１４ 磁石収納穴、１５ 第１端板、２０ 軸方向流路、２１ 径方向流路、２２ 冷媒溜まり部、２３ 絞り栓（絞り部）、２４ 連通路、２５ 大径部、２６ 突起（絞り部）。   DESCRIPTION OF SYMBOLS 1 Housing, 2 Stator, 8 Refrigerant storage part, 9 Guide member, 10 Rotor, 11 Rotating shaft, 12 Rotor core, 13 Permanent magnet, 14 Magnet accommodation hole, 15 1st end plate, 20 Axial direction flow path, 21 radial flow path, 22 refrigerant reservoir, 23 throttle plug (throttle part), 24 communication path, 25 large diameter part, 26 projection (throttle part).

Claims (9)

ハウジングと、
上記ハウジングに保持された固定子と、
上記ハウジングに回転可能に保持された回転軸に固着されて、上記固定子内に上記固定子と同軸に配設された回転子と、を備え、
上記回転子は、上記回転軸に装着され、複数の磁石収納穴が、それぞれ、穴方向を軸方向として、軸方向の一端から他端に至るように形成されて、周方向に配列されている回転子鉄心と、上記複数の磁石収納穴のそれぞれに収納されている永久磁石と、上記回転子鉄心の軸方向の一端面に接する状態に上記回転軸に装着されて、上記複数の磁石収納穴を覆っている第１端板と、を備える回転電機において、
上記回転軸の軸方向の一端が内部に挿入されている冷媒貯留部と、
上記回転軸の軸方向の一端から他端側に軸中心線に沿って形成された軸方向流路と、
上記第１端板の上記回転子鉄心と接する面を凹ませて上記回転軸を取り囲む環状に形成され、上記複数の磁石収納穴の少なくとも１つが接続される冷媒溜まり部と、
上記第１端板の軸方向の装着位置で、上記軸方向流路に対して直交して接続されて上記回転軸の外周面に開口し、上記冷媒溜まり部と直接、または上記第１端板の上記回転子鉄心と接する面を凹ませて形成された径方向に延びる連通路を介して接続される、少なくとも１つの径方向流路と、
上記軸方向流路から上記冷媒溜まり部に至る流路のなかの少なくとも１つの流路の一部に形成された、流路断面積を縮小する絞り部と、を有する回転電機。 A housing;
A stator held in the housing;
A rotor fixed to a rotating shaft rotatably held in the housing, and disposed in the stator coaxially with the stator, and
The rotor is attached to the rotating shaft, and a plurality of magnet housing holes are formed from the one end to the other end in the axial direction with the hole direction as the axial direction, and are arranged in the circumferential direction. A rotor core, permanent magnets housed in each of the plurality of magnet housing holes, and a plurality of magnet housing holes mounted on the rotating shaft so as to be in contact with one axial end surface of the rotor core. A rotary electric machine comprising: a first end plate covering
One end of the rotating shaft in the axial direction is inserted in the inside, and
An axial flow path formed along an axial center line from one axial end of the rotating shaft to the other end;
Refrigerant pool part formed in an annular shape surrounding the rotating shaft by denting the surface of the first end plate in contact with the rotor core, to which at least one of the plurality of magnet housing holes is connected,
At the mounting position in the axial direction of the first end plate, the first end plate is connected orthogonally to the axial flow path and opens to the outer peripheral surface of the rotating shaft, and directly with the refrigerant reservoir or the first end plate At least one radial flow path connected through a radially extending communication path formed by denting the surface in contact with the rotor iron core;
A rotary electric machine comprising: a throttle portion that is formed in a part of at least one of the flow paths from the axial flow path to the refrigerant reservoir, and reduces a cross-sectional area of the flow path. 上記絞り部は、筒状の絞り栓を上記径方向流路に装着して構成されている請求項１記載の回転電機。   The rotating electrical machine according to claim 1, wherein the throttle portion is configured by mounting a cylindrical throttle plug on the radial flow path. 大径部が、上記径方向流路の開口側に形成されており、
上記絞り栓が、上記大径部に装着されている請求項２記載の回転電機。 The large diameter portion is formed on the opening side of the radial flow path,
The rotating electrical machine according to claim 2, wherein the throttle plug is attached to the large diameter portion. 上記絞り栓は、上記径方向流路に圧入固定されている請求項２又は請求項３記載の回転電機。   The rotating electrical machine according to claim 2 or 3, wherein the throttle plug is press-fitted and fixed in the radial flow path. 上記絞り栓は、上記径方向流路に接着固定されている請求項２又は請求項３記載の回転電機。   4. The rotating electrical machine according to claim 2, wherein the throttle plug is bonded and fixed to the radial flow path. 上記絞り部は、上記連通路の上記径方向流路から上記冷媒溜まり部に至る領域の流路断面積を、上記径方向流路の流路断面積より小さくして構成されている請求項１記載の回転電機。   The narrowed portion is configured such that a flow passage cross-sectional area in a region from the radial flow passage of the communication passage to the refrigerant reservoir portion is smaller than a flow passage cross-sectional area of the radial flow passage. The rotating electrical machine described. 上記絞り部は、上記連通路の上記径方向流路から上記冷媒溜まり部に至る領域の一部の流路断面積を、上記径方向流路の流路断面積より小さくして構成されている請求項１記載の回転電機。   The restricting portion is configured such that a partial cross-sectional area of a region of the communication path from the radial flow path to the refrigerant reservoir is smaller than the cross-sectional area of the radial flow path. The rotating electrical machine according to claim 1. 上記絞り部は、上記軸方向流路から上記冷媒溜まり部に至る流路のなかの少なくとも１つの流路を除く流路に形成されている請求項１から請求項７のいずれか１項に記載の回転電機。   The said restriction | limiting part is formed in the flow path except the at least 1 flow path in the flow path from the said axial direction flow path to the said refrigerant | coolant reservoir part, The any one of Claims 1-7. Rotating electric machine. 上記冷媒貯留部より鉛直上方の位置から上記ハウジング内に供給された冷媒を上記冷媒貯留部に案内するガイド部材を備える請求項１から請求項８のいずれか１項に記載の回転電機。   The rotating electrical machine according to any one of claims 1 to 8, further comprising a guide member that guides the refrigerant supplied into the housing from a position vertically above the refrigerant reservoir to the refrigerant reservoir.
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