WO2024111020A1 - Rotary electric machine - Google Patents

Rotary electric machine Download PDF

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Publication number
WO2024111020A1
WO2024111020A1 PCT/JP2022/042985 JP2022042985W WO2024111020A1 WO 2024111020 A1 WO2024111020 A1 WO 2024111020A1 JP 2022042985 W JP2022042985 W JP 2022042985W WO 2024111020 A1 WO2024111020 A1 WO 2024111020A1
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Prior art keywords
stator core
housing
electric machine
inner housing
rotating electric
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PCT/JP2022/042985
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French (fr)
Japanese (ja)
Inventor
博 青木
基男 北原
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日立Astemo株式会社
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Priority to PCT/JP2022/042985 priority Critical patent/WO2024111020A1/en
Publication of WO2024111020A1 publication Critical patent/WO2024111020A1/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/02—Casings or enclosures characterised by the material thereof

Definitions

  • the present invention relates to a rotating electric machine.
  • Cooling performance is important for the continuous operation of a rotating electric machine, and cooling the stator of the rotating electric machine in a high-temperature environment is particularly important from the perspective of extending the time that the machine can be operated continuously.
  • Patent Document 1 discloses a rotating electric machine that can dissipate heat from the stator core to the case without causing distortion of the stator core.
  • the purpose of the present invention is to provide a rotating electric machine that can achieve both improved cooling and reduced stress.
  • a rotating electric machine comprising an outer housing that houses a stator core on the radial outside of the stator core, and an inner housing that houses the stator core between the stator core and the outer housing, the inner housing having an internal axial refrigerant flow path, holding the outer housing on the radial outside and holding the stator core on its radial inside, the linear expansion coefficient of the inner housing being greater than the linear expansion coefficient of the outer housing.
  • 1 is a cross-sectional view of a rotating electric machine according to an embodiment of the present invention
  • 2 is a cross-sectional view of the motor housing of FIG. 1
  • the rotating electric machine 1 has a stator core 6 formed of electromagnetic steel plate.
  • the stator core 6 is held by an inner housing 2 and an outer housing 7 by a method such as shrink fitting.
  • the outer housing 7 accommodates the stator core 6 on the radial outside of the stator core 6.
  • the inner housing 2 accommodates the stator core 6 between the stator core 6 and the outer housing 7.
  • the inner housing 2 is formed of an aluminum material, and the outer housing 7 is formed of an iron material.
  • an iron ring-shaped outer housing 7 is provided on the outer periphery of the inner housing 2, which is a conventional motor housing.
  • the inner housing 2 has a base 2a and a connection portion 5.
  • the connection portion 5 has a loose fitting portion 4 with an axial through hole.
  • the fixing member 3 is inserted into the loose fitting portion 4, and the inner housing 2 is fixed to the rotating electric machine 1.
  • the inner housing 2 holds the outer housing 7 on its radially outer side, and holds the stator core 6 on its radially inner side.
  • the inner housing 2 is formed so that its linear expansion coefficient is greater than that of the outer housing 7.
  • the inner housing 2 changes in volume with temperature changes due to the properties of the aluminum material. Therefore, the inner housing 2 is pressed against the stator core 6 at high temperatures, and the stator core 6 is fixed in place.
  • the inner housing 2 has a number of bases 2a that form a refrigerant flow path 8 inside. Each base 2a is formed so that it is separated from the other bases 2a adjacent in the circumferential direction at a predetermined interval. Between the multiple bases 2a, connection parts 5 are formed that are adjacent to the bases 2a in the circumferential direction and connect the bases 2a to each other. The connection parts 5 are formed from a material that is less rigid than the bases 2a.
  • the rotating electric machine 1 has such a configuration, and at high temperatures the inner housing 2 acts in a tightening direction, with the multiple bases 2a coming into contact with the stator core 6. At the same time, the outer periphery of the inner housing 2 is fixed with the tightening margin that occurs between it and the outer housing 7 due to the expansion of the bases 2a that occurs at high temperatures. At high temperatures, the tightening is maintained due to the difference in linear expansion coefficient between the core 6 and the inner housing 2, which makes it possible to suppress the occurrence of gaps between the stator core 6 and the rotating electric machine 1.
  • the inner housing 2 can exert a cooling effect even when the gap between the stator core 6 and the base 2a is narrow at high temperatures, which contributes to improving the heat resistance by maintaining the cooling effect of the stator core 6, and eliminates the restriction of fixing the stator core 6 at a specified temperature when exposed to high temperatures.
  • the inner housing 2 shrinks more than the stator core 6 and outer housing 7. This causes the inner housing 2 to be tightened loosely at low temperatures, reducing the increased tightening margin that was an issue at low temperatures. This reduces the contact pressure of the housing against the stator core 6 and prevents the generation of excessive stress, maintaining the position of the inner housing 2 at low temperatures and preventing the occurrence of cracks in the inner housing 2. These also increase the design freedom of the magnetic circuit and improve the performance of the rotating electric machine 1. It also improves the reliability of holding the stator core 6.
  • connection parts 5 that connect the four base parts 2a in the circumferential direction are shown as being separated, but the base parts 2a and the connection parts 5 may be molded integrally.
  • the stator core 6 may also be fixed to the inner periphery of the inner housing 2 by a jig (not shown) that presses from the outer periphery of the outer housing 7 toward the stator core 6.
  • the housing was shrink-fitted when assembling the housing and stator, but with this invention, when removing the stator core from the housing, for example a thermostatic chamber, a controlled container that can maintain a constant temperature for long periods of time, is not required. Instead, the outermost ring is held in place by a light press fit, so shrink fitting itself is not necessary with this structure, reducing labor hours and simplifying equipment, contributing to environmental advantages.
  • the present invention eliminates the need to pay attention to concerns about a gap between the stator core 6 and the inner housing 2 that could expose the stator core 6 to the outside air, or the impact of contamination on insulation, and there is no need to consider the use of lubricating oil inside the rotating electric machine 1, making it possible to achieve both reliability and productivity.
  • the inner housing 2 has a base 2a formed into a continuous circular shape, and has a discarded hole 9 on each side adjacent in the circumferential direction of the portion where the fixing member 3 is inserted.
  • the inner housing 2 does not need to have a divided base 2a and no connecting portion 5 is required, which contributes to improved productivity.
  • the base 2a may have a recess 10 on at least one of the outer peripheral side surface and the inner peripheral side surface at a location between the refrigerant flow paths 8 as viewed in the axial direction and where the fixing member 3 is inserted.
  • Fig. 4 shows an example in which the recess 10 is provided on both the outer peripheral side surface and the inner peripheral side surface of the base 2a.
  • the recess 10 has a groove in a direction opposite to the direction in which the base 2a contacts at least one of the outer housing 7 and the stator core 6.
  • This structure ensures that the inner housing 2 does not hold the outer housing 7 or the stator core 6 on the surface that forms the recess 10. This can further reduce the stress on the stator core 6 or the stress on the outer housing 7 that occurs when the inner housing 2 holds the stator core 6. It can also contribute to improving the assembly of the rotating electric machine 1.
  • the rotating electric machine 1 includes an outer housing 7 that houses the stator core 6 on the radial outside of the stator core 6, and an inner housing 2 that houses the stator core 6 between the stator core 6 and the outer housing 7.
  • the inner housing 2 has a refrigerant flow path 8 in the axial direction inside, holds the outer housing 7 on the radial outside, and holds the stator core 6 on the radial inside, and the linear expansion coefficient of the inner housing 2 is greater than that of the outer housing 7. In this way, the objective is to provide a rotating electric machine 1 that can achieve both improved cooling and reduced stress.
  • the inner housing 2 has multiple bases 2a each having a refrigerant flow path 8.
  • the bases 2a are formed with a predetermined distance between each other base 2a adjacent in the circumferential direction. This allows the bases to be tightly held in place at high temperatures and prevents excessive stress from occurring at low temperatures.
  • the inner housing 2 includes multiple bases 2a with refrigerant flow paths 8, and connecting portions 5 formed of a material with lower rigidity than the bases 2a.
  • the bases 2a are adjacent to the connecting portions 5 in the circumferential direction.
  • the connecting portions 5 connect the multiple bases 2a to each other between the multiple bases 2a.
  • the bases 2a and the connecting portions 5 are molded integrally. This allows the inner housing 2 to accommodate expansion and contraction at high and low temperatures.
  • the base 2a has a recess 10 on at least one of the outer peripheral side surface and the inner peripheral side surface at the location where the fixing member 3 that fixes the inner housing 2 to the rotating electric machine 1 is inserted.
  • the recess 10 has a groove in the direction opposite to the direction in which the base 2a contacts at least one of the outer housing 7 and the stator core 6. In this way, the holding force can be reduced on the side of the inner housing 2 where the recess 10 is provided, which contributes to alleviating excessive stress.
  • the outer periphery of the inner housing 2 is fixed by the interference between it and the outer housing 7. This allows the inner housing 2 to be fixed to the outer housing 7 even at high temperatures.
  • the stator core 6 is fixed to the inner circumference of the inner housing 2 by a jig that presses from the outer circumference of the outer housing 7 toward the stator core 6. This allows stable fixation even when the tightening is relaxed when the temperature is cold.
  • the present invention is not limited to the above-described embodiment, and various modifications and other configurations can be combined without departing from the spirit of the invention. Furthermore, the present invention is not limited to those having all of the configurations described in the above-described embodiment, and also includes those in which some of the configurations have been omitted.
  • Reference Signs List 1 Rotating electric machine 2 Inner housing 2a Base 3 Fixing member 4 Loose fitting portion 5 Connection portion 6 Stator core 7 Outer housing 8 Coolant flow path 9 Discarding hole 10 Recess

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

Abstract

The present invention provides a rotary electric machine comprising an outer housing that is disposed on the radially outward side of a stator core and that accommodates said stator core, and an inner housing that is disposed between the stator core and the outer housing and that accommodates the stator core, wherein: the inner housing has a refrigerant flow path in the axial direction of the interior, holds the outer housing on the radially outer side, and holds the stator core on the radially inner side; and the coefficient of linear expansion of the inner housing is greater than the coefficient of linear expansion of the outer housing.

Description

回転電機Rotating Electric Machine
　本発明は、回転電機に関する。 The present invention relates to a rotating electric machine.
　回転電機の連続運転には、冷却性能が重要であり、特に、高温環境において回転電機のステータが冷却されることは、連続運転可能時間を延ばす観点から重要視されている。例えば、特許文献１では、ステータコアの歪みを発生させることなく、ステータコアの熱をケースに放熱することができる回転電機について開示されている。 Cooling performance is important for the continuous operation of a rotating electric machine, and cooling the stator of the rotating electric machine in a high-temperature environment is particularly important from the perspective of extending the time that the machine can be operated continuously. For example, Patent Document 1 discloses a rotating electric machine that can dissipate heat from the stator core to the case without causing distortion of the stator core.
特開２０２０－１２０４８９号公報JP 2020-120489 A
　特許文献１に記載の構成では、電磁鋼板であるステータコアをモータハウジングに焼き嵌めする方法を採用する場合、モータハウジングはアルミ材質であるため、線膨張差によって低温時にステータコアに対してハウジングによる過大な締付けが発生する。このようにすると、ハウジングに過大な応力が発生し亀裂が起こる可能性がある。また、このような応力発生を避けるために締め代を減らした場合、逆に高温時にはステータコアとハウジングの間に隙間ができてしまい、保持力が確保できずかつステータコア内径側のコア開きが発生する。よって、冷却効果が発揮できずにステータ保持に伴う信頼性を損なう課題が生じる。 In the configuration described in Patent Document 1, when a method of shrink-fitting a stator core, which is an electromagnetic steel sheet, into a motor housing is adopted, the motor housing is made of aluminum, and therefore the difference in linear expansion causes the housing to clamp excessively against the stator core at low temperatures. This can cause excessive stress in the housing, which can lead to cracks. Furthermore, if the clamping margin is reduced to avoid such stress generation, conversely, a gap will form between the stator core and the housing at high temperatures, making it impossible to ensure holding force and causing the core to open on the inner diameter side of the stator core. This means that the cooling effect cannot be achieved, and there is an issue of reduced reliability associated with stator holding.
　本発明は、冷却性の向上と発生応力の緩和を両立できる回転電機を提供することが目的である。 The purpose of the present invention is to provide a rotating electric machine that can achieve both improved cooling and reduced stress.
　固定子コアの径方向外側で前記固定子コアを収容するアウターハウジングと、前記固定子コアと前記アウターハウジングとの間で前記固定子コアを収容するインナーハウジングと、を備える、回転電機であって、前記インナーハウジングは内部の軸方向に冷媒流路を有し、径方向外側で前記アウターハウジングを保持し、かつその径方向内側で前記固定子コアを保持し、前記インナーハウジングの線膨張率は、前記アウターハウジングの前記線膨張率より大きい。 A rotating electric machine comprising an outer housing that houses a stator core on the radial outside of the stator core, and an inner housing that houses the stator core between the stator core and the outer housing, the inner housing having an internal axial refrigerant flow path, holding the outer housing on the radial outside and holding the stator core on its radial inside, the linear expansion coefficient of the inner housing being greater than the linear expansion coefficient of the outer housing.
　冷却性の向上と発生応力の緩和を両立できる回転電機を提供できる。 We can provide a rotating electrical machine that can achieve both improved cooling and reduced stress.
本発明の一実施形態に係る、回転電機の断面図1 is a cross-sectional view of a rotating electric machine according to an embodiment of the present invention; 図１のモータハウジングの断面図2 is a cross-sectional view of the motor housing of FIG. 1; 変形例１Variation 1 変形例２Variation 2
　以下、図面を参照して本発明の実施形態を説明する。以下の記載および図面は、本発明を説明するための例示であって、説明の明確化のため、適宜、省略および簡略化がなされている。本発明は、他の種々の形態でも実施する事が可能である。特に限定しない限り、各構成要素は単数でも複数でも構わない。 Below, an embodiment of the present invention will be described with reference to the drawings. The following description and drawings are examples for explaining the present invention, and some parts have been omitted or simplified as appropriate for clarity of explanation. The present invention can also be implemented in various other forms. Unless otherwise specified, each component may be singular or plural.
　図面において示す各構成要素の位置、大きさ、形状、範囲などは、発明の理解を容易にするため、実際の位置、大きさ、形状、範囲などを表していない場合がある。このため、本発明は、必ずしも、図面に開示された位置、大きさ、形状、範囲などに限定されない。 The position, size, shape, range, etc. of each component shown in the drawings may not represent the actual position, size, shape, range, etc., in order to facilitate understanding of the invention. Therefore, the present invention is not necessarily limited to the position, size, shape, range, etc. disclosed in the drawings.
（本発明の一実施形態と全体構成）
　（図１）
　回転電機１は、電磁鋼板で形成されている固定子コア６を有している。固定子コア６は、焼き嵌め等の方法により、インナーハウジング２とアウターハウジング７とによって保持されている。アウターハウジング７は、固定子コア６の径方向外側で固定子コア６を収容している。インナーハウジング２は、固定子コア６とアウターハウジング７との間で固定子コア６を収容している。インナーハウジング２はアルミ材質で形成され、アウターハウジング７は鉄の材質で形成されている。本発明は、従来のモータハウジングであるインナーハウジング２の外周に、鉄製のリング形状であるアウターハウジング７を設けている形状である。 (One embodiment of the present invention and overall configuration)
(Figure 1)
The rotating electric machine 1 has a stator core 6 formed of electromagnetic steel plate. The stator core 6 is held by an inner housing 2 and an outer housing 7 by a method such as shrink fitting. The outer housing 7 accommodates the stator core 6 on the radial outside of the stator core 6. The inner housing 2 accommodates the stator core 6 between the stator core 6 and the outer housing 7. The inner housing 2 is formed of an aluminum material, and the outer housing 7 is formed of an iron material. In the present invention, an iron ring-shaped outer housing 7 is provided on the outer periphery of the inner housing 2, which is a conventional motor housing.
　インナーハウジング２は、基部２ａと接続部５を有している。接続部５は、軸方向に貫通孔を備える遊嵌部４を有している。遊嵌部４に固定部材３が挿通されることで、インナーハウジング２は回転電機１に固定されている。 The inner housing 2 has a base 2a and a connection portion 5. The connection portion 5 has a loose fitting portion 4 with an axial through hole. The fixing member 3 is inserted into the loose fitting portion 4, and the inner housing 2 is fixed to the rotating electric machine 1.
（図２）
　インナーハウジング２は、その径方向外側でアウターハウジング７を保持し、かつその径方向内側で固定子コア６を保持している。また、インナーハウジング２の線膨張率は、アウターハウジング７の線膨張率より大きくなるように形成されている。インナーハウジング２は、アルミ材質の性質によって、温度変化によって体積変化する。そのため、インナーハウジング２は、高温時に固定子コア６に押し付けられ、固定子コア６が固定される。 (Figure 2)
The inner housing 2 holds the outer housing 7 on its radially outer side, and holds the stator core 6 on its radially inner side. The inner housing 2 is formed so that its linear expansion coefficient is greater than that of the outer housing 7. The inner housing 2 changes in volume with temperature changes due to the properties of the aluminum material. Therefore, the inner housing 2 is pressed against the stator core 6 at high temperatures, and the stator core 6 is fixed in place.
　インナーハウジング２は、内部に冷媒流路８を形成している複数の基部２ａを有している。基部２ａは、それぞれ周方向に隣接する他の基部２ａと所定の間隔を空けて分割されるように形成されている。複数の基部２ａ同士の間には、基部２ａと周方向に隣接し、かつ基部２ａ同士を接続する接続部５が形成されている。接続部５は、基部２ａよりも剛性の低い素材で形成されている。 The inner housing 2 has a number of bases 2a that form a refrigerant flow path 8 inside. Each base 2a is formed so that it is separated from the other bases 2a adjacent in the circumferential direction at a predetermined interval. Between the multiple bases 2a, connection parts 5 are formed that are adjacent to the bases 2a in the circumferential direction and connect the bases 2a to each other. The connection parts 5 are formed from a material that is less rigid than the bases 2a.
　回転電機１は、このような構成を有することで、高温時にはインナーハウジング２は締め付け方向に働き、複数の基部２ａが固定子コア６と接触する。これと同時に、インナーハウジング２の外周側が、高温時に発生する基部２ａの拡張によって、アウターハウジング７との間で発生する締め代で固定される。高温時においてコア６とインナーハウジング２と間の線膨張係数差によって締付が保持されることで、固定子コア６と回転電機１との隙間の発生を抑制できる。 The rotating electric machine 1 has such a configuration, and at high temperatures the inner housing 2 acts in a tightening direction, with the multiple bases 2a coming into contact with the stator core 6. At the same time, the outer periphery of the inner housing 2 is fixed with the tightening margin that occurs between it and the outer housing 7 due to the expansion of the bases 2a that occurs at high temperatures. At high temperatures, the tightening is maintained due to the difference in linear expansion coefficient between the core 6 and the inner housing 2, which makes it possible to suppress the occurrence of gaps between the stator core 6 and the rotating electric machine 1.
　また、インナーハウジング２は高温時に固定子コア６と基部２ａとの間の隙間が狭くなっている状態であっても、冷却効果を発揮することができるため、固定子コア６の冷却効果を維持して耐熱性向上に貢献し、かつ高温に関して所定の温度内に留めながら固定させるような制限がなくなる。 In addition, the inner housing 2 can exert a cooling effect even when the gap between the stator core 6 and the base 2a is narrow at high temperatures, which contributes to improving the heat resistance by maintaining the cooling effect of the stator core 6, and eliminates the restriction of fixing the stator core 6 at a specified temperature when exposed to high temperatures.
　逆に、低温時には、固定子コア６およびアウターハウジング７に比べて、インナーハウジング２が大きく収縮する。これにより、低温時はインナーハウジング２の締め付けが緩くなる方向に働き、低温時に課題となっていた増加する締め代を減らすことができる。これにより、固定子コア６に対するハウジングの接触圧力が緩和され、過大な応力の発生を防ぐことで、低温時のインナーハウジング２の姿勢が保持され、インナーハウジング２のクラック発生等を防ぐことができる。また、これらにより磁気回路の設計自由度が上がり、回転電機１の性能も向上させることができる。また、固定子コア６を保持する信頼性が向上する。 Conversely, at low temperatures, the inner housing 2 shrinks more than the stator core 6 and outer housing 7. This causes the inner housing 2 to be tightened loosely at low temperatures, reducing the increased tightening margin that was an issue at low temperatures. This reduces the contact pressure of the housing against the stator core 6 and prevents the generation of excessive stress, maintaining the position of the inner housing 2 at low temperatures and preventing the occurrence of cracks in the inner housing 2. These also increase the design freedom of the magnetic circuit and improve the performance of the rotating electric machine 1. It also improves the reliability of holding the stator core 6.
　なお、図２では周方向に４つの基部２ａを接続する４つの接続部５が分割されるように図示されているが、基部２ａと接続部５が一体に成形されていてもよい。 In addition, in FIG. 2, the four connection parts 5 that connect the four base parts 2a in the circumferential direction are shown as being separated, but the base parts 2a and the connection parts 5 may be molded integrally.
　また、固定子コア６は、アウターハウジング７の外周側から固定子コア６に向かって圧入する治具（図示せず）によって、インナーハウジング２の内周側に固定されていてもよい。 The stator core 6 may also be fixed to the inner periphery of the inner housing 2 by a jig (not shown) that presses from the outer periphery of the outer housing 7 toward the stator core 6.
　本発明は、従来ハウジングとステータの組み立て時に、ハウジングを焼き嵌めしていたことで、ステータコアをハウジングから取り出す場合、例えば長時間一定温度に保つことができるような制御を施した容器である恒温槽が不要になる。代わりに、最外周のリングが軽圧入で保持されるため、本構造では焼き嵌め自体が不要となり、工数の削減および設備の簡素化を実現でき、環境優位性に貢献する。 　In the past, the housing was shrink-fitted when assembling the housing and stator, but with this invention, when removing the stator core from the housing, for example a thermostatic chamber, a controlled container that can maintain a constant temperature for long periods of time, is not required. Instead, the outermost ring is held in place by a light press fit, so shrink fitting itself is not necessary with this structure, reducing labor hours and simplifying equipment, contributing to environmental advantages.
　また、本発明により、固定子コア６とインナーハウジング２との間に隙間が空いて、固定子コア６が外気にさらされる懸念や、コンタミによる絶縁影響などに注意を向ける必要がなくなり、かつ、回転電機１の室内での潤滑油の使用についても考慮する必要もないため、信頼性と生産性を両立できる。 In addition, the present invention eliminates the need to pay attention to concerns about a gap between the stator core 6 and the inner housing 2 that could expose the stator core 6 to the outside air, or the impact of contamination on insulation, and there is no need to consider the use of lubricating oil inside the rotating electric machine 1, making it possible to achieve both reliability and productivity.
（第１変形例）
（図３）
　インナーハウジング２は基部２ａを一続きに連続する円形状にして、かつ固定部材３を挿通する箇所の周方向に隣接する両側に、それぞれ捨て穴９を有している。このように、基部２ａを一体に成形し、前述した実施形態で設けた接続部５の代わりに捨て穴９を形成することにより、インナーハウジング２は、基部２ａを分割して設け、かつ接続部５を設ける必要がなくなるため、生産性の向上に貢献できる。 (First Modification)
(Figure 3)
The inner housing 2 has a base 2a formed into a continuous circular shape, and has a discarded hole 9 on each side adjacent in the circumferential direction of the portion where the fixing member 3 is inserted. By integrally molding the base 2a in this way and forming the discarded hole 9 instead of the connecting portion 5 provided in the above-described embodiment, the inner housing 2 does not need to have a divided base 2a and no connecting portion 5 is required, which contributes to improved productivity.
（第２変形例）
（図４）
　基部２ａは、軸方向から見て冷媒流路８同士の間でかつ固定部材３を挿通する箇所において、外周側面と内周側面のうち少なくとも一方に凹部１０を備えていてもよい。なお、図４では、基部２ａの外周側面と内周側面の両方に凹部１０を備えている例を示した。凹部１０は、基部２ａがアウターハウジング７と固定子コア６のうち少なくとも一方に対して接触する方向とは逆の方向に、溝を有している。 (Second Modification)
(Figure 4)
The base 2a may have a recess 10 on at least one of the outer peripheral side surface and the inner peripheral side surface at a location between the refrigerant flow paths 8 as viewed in the axial direction and where the fixing member 3 is inserted. Note that Fig. 4 shows an example in which the recess 10 is provided on both the outer peripheral side surface and the inner peripheral side surface of the base 2a. The recess 10 has a groove in a direction opposite to the direction in which the base 2a contacts at least one of the outer housing 7 and the stator core 6.
　このような構造により、インナーハウジング２は、凹部１０を形成している側の面で、アウターハウジング７や固定子コア６を保持しないようにしている。よって、インナーハウジング２が固定子コア６を保持する際に発生する固定子コア６に対する応力、あるいはアウターハウジング７に対する応力をより緩和できる。また、回転電機１の組み立て性の向上にも貢献できる。 This structure ensures that the inner housing 2 does not hold the outer housing 7 or the stator core 6 on the surface that forms the recess 10. This can further reduce the stress on the stator core 6 or the stress on the outer housing 7 that occurs when the inner housing 2 holds the stator core 6. It can also contribute to improving the assembly of the rotating electric machine 1.
　以上説明した本発明の一実施形態によれば、以下の作用効果を奏する。 The embodiment of the present invention described above provides the following effects.
（１）回転電機１は、固定子コア６の径方向外側で固定子コア６を収容するアウターハウジング７と、固定子コア６とアウターハウジング７との間で固定子コア６を収容するインナーハウジング２と、を備える。インナーハウジング２は内部の軸方向に冷媒流路８を有し、径方向外側でアウターハウジング７を保持し、かつ径方向内側で固定子コア６を保持し、インナーハウジング２の線膨張率は、アウターハウジング７の線膨張率より大きい。このようにしたことで、冷却性の向上と発生応力の緩和を両立できる回転電機１を提供することが目的である。 (1) The rotating electric machine 1 includes an outer housing 7 that houses the stator core 6 on the radial outside of the stator core 6, and an inner housing 2 that houses the stator core 6 between the stator core 6 and the outer housing 7. The inner housing 2 has a refrigerant flow path 8 in the axial direction inside, holds the outer housing 7 on the radial outside, and holds the stator core 6 on the radial inside, and the linear expansion coefficient of the inner housing 2 is greater than that of the outer housing 7. In this way, the objective is to provide a rotating electric machine 1 that can achieve both improved cooling and reduced stress.
（２）インナーハウジング２は、冷媒流路８を備える複数の基部２ａを備える。基部２ａは、それぞれ周方向に隣接する他の基部２ａと所定の間隔を空けて形成される。このようにしたことで、高温時には締め付け保持され、低温時には過大な応力の発生を防ぐことができる。 (2) The inner housing 2 has multiple bases 2a each having a refrigerant flow path 8. The bases 2a are formed with a predetermined distance between each other base 2a adjacent in the circumferential direction. This allows the bases to be tightly held in place at high temperatures and prevents excessive stress from occurring at low temperatures.
（３）インナーハウジング２は、冷媒流路８を備える複数の基部２ａと、基部２ａよりも剛性の低い素材で形成されている接続部５とを備える。基部２ａは、接続部５と周方向に隣接する。接続部５は、複数の基部２ａ同士の間で、複数の基部２ａ同士を接続する。基部２ａと接続部５は、一体に成形されている。このようにしたことで、高温時と低温時のインナーハウジング２の膨張および収縮に対応できる。 (3) The inner housing 2 includes multiple bases 2a with refrigerant flow paths 8, and connecting portions 5 formed of a material with lower rigidity than the bases 2a. The bases 2a are adjacent to the connecting portions 5 in the circumferential direction. The connecting portions 5 connect the multiple bases 2a to each other between the multiple bases 2a. The bases 2a and the connecting portions 5 are molded integrally. This allows the inner housing 2 to accommodate expansion and contraction at high and low temperatures.
（４）基部２ａは、インナーハウジング２を回転電機１に固定する固定部材３を挿通する箇所において、外周側面と内周側面のうち少なくとも一方の面に凹部１０を備える。凹部１０は、基部２ａがアウターハウジング７と固定子コア６のうち少なくとも一方に対して接触する方向とは逆の方向に、溝を有している。このようにしたことで、インナーハウジング２において凹部１０を設けている側は保持力を減らすことができるため、過大な応力の緩和に貢献できる。 (4) The base 2a has a recess 10 on at least one of the outer peripheral side surface and the inner peripheral side surface at the location where the fixing member 3 that fixes the inner housing 2 to the rotating electric machine 1 is inserted. The recess 10 has a groove in the direction opposite to the direction in which the base 2a contacts at least one of the outer housing 7 and the stator core 6. In this way, the holding force can be reduced on the side of the inner housing 2 where the recess 10 is provided, which contributes to alleviating excessive stress.
（５）インナーハウジング２の外周側が、アウターハウジング７との間で発生する締め代によって固定される。このようにしたことで、高温時にインナーハウジング２がアウターハウジング７に固定される。 (5) The outer periphery of the inner housing 2 is fixed by the interference between it and the outer housing 7. This allows the inner housing 2 to be fixed to the outer housing 7 even at high temperatures.
（６）固定子コア６は、アウターハウジング７の外周側から固定子コア６に向かって圧入する治具によって、インナーハウジング２の内周側に固定される。このようにしたことで、冷温時に締め付けが緩和された場合でも、安定した固定性を発揮させることができる。 (6) The stator core 6 is fixed to the inner circumference of the inner housing 2 by a jig that presses from the outer circumference of the outer housing 7 toward the stator core 6. This allows stable fixation even when the tightening is relaxed when the temperature is cold.
　なお、本発明は上記の実施形態に限定されるものではなく、その要旨を逸脱しない範囲内で様々な変形や他の構成を組み合わせることができる。また本発明は、上記の実施形態で説明した全ての構成を備えるものに限定されず、その構成の一部を削除したものも含まれる。 The present invention is not limited to the above-described embodiment, and various modifications and other configurations can be combined without departing from the spirit of the invention. Furthermore, the present invention is not limited to those having all of the configurations described in the above-described embodiment, and also includes those in which some of the configurations have been omitted.
１　回転電機
２　インナーハウジング
　２ａ　基部
３　固定部材
４　遊嵌部
５　接続部
６　固定子コア
７　アウターハウジング
８　冷媒流路
９　捨て穴
１０　凹部 Reference Signs List 1 Rotating electric machine 2 Inner housing 2a Base 3 Fixing member 4 Loose fitting portion 5 Connection portion 6 Stator core 7 Outer housing 8 Coolant flow path 9 Discarding hole 10 Recess

Claims (6)

  1. 　固定子コアの径方向外側で前記固定子コアを収容するアウターハウジングと、前記固定子コアと前記アウターハウジングとの間で前記固定子コアを収容するインナーハウジングと、を備える、回転電機であって、
    　前記インナーハウジングは、内部の軸方向に冷媒流路を有し、前記径方向外側で前記アウターハウジングを保持かつ径方向内側で前記固定子コアを保持し、
    　前記インナーハウジングの線膨張率は、前記アウターハウジングの前記線膨張率より大きい
    　回転電機。     1. A rotating electric machine comprising: an outer housing that accommodates a stator core on a radially outer side of the stator core; and an inner housing that accommodates the stator core between the stator core and the outer housing,
    the inner housing has an internal axial coolant flow path, holds the outer housing on the radially outer side, and holds the stator core on the radially inner side;
    The rotating electric machine, wherein the linear expansion coefficient of the inner housing is greater than the linear expansion coefficient of the outer housing.
  2. 　請求項１に記載の回転電機であって、
    　前記インナーハウジングは、前記冷媒流路を備える複数の基部を備え、
    　前記基部は、それぞれ周方向に隣接する他の前記基部と所定の間隔を空けて形成される
    　回転電機。     2. The rotating electric machine according to claim 1,
    the inner housing includes a plurality of base portions each including the refrigerant flow passage;
    The base portions are each formed with a predetermined interval between adjacent base portions in a circumferential direction.
  3. 　請求項１に記載の回転電機であって、
    　前記インナーハウジングは、前記冷媒流路を備える複数の基部と、前記基部よりも剛性の低い素材で形成されている接続部とを備え、
    　前記基部は、前記接続部と周方向に隣接し、
    　前記接続部は、複数の前記基部同士の間で、複数の前記基部同士を接続し、
    　前記基部と前記接続部は、一体に成形されている
    　回転電機。     2. The rotating electric machine according to claim 1,
    the inner housing includes a plurality of base portions each having the refrigerant flow path, and a connecting portion formed of a material having a lower rigidity than the base portions,
    The base portion is adjacent to the connection portion in a circumferential direction,
    The connection portion connects the plurality of base portions to each other between the plurality of base portions,
    The base portion and the connection portion are integrally formed.
  4. 　請求項３に記載の回転電機であって、
    　前記基部は、前記インナーハウジングを前記回転電機に固定する固定部材を挿通する箇所において、外周側面と内周側面のうち少なくとも一方の面に凹部を備え、
    　前記凹部は、前記基部が前記アウターハウジングと前記固定子コアのうち少なくとも一方に対して接触する方向とは逆の方向に、溝を有している
    　回転電機。     4. The rotating electric machine according to claim 3,
    the base portion has a recess in at least one of an outer peripheral side surface and an inner peripheral side surface at a position where a fixing member for fixing the inner housing to the rotating electric machine is inserted,
    the recess has a groove in a direction opposite to a direction in which the base contacts at least one of the outer housing and the stator core.
  5. 　請求項１に記載の回転電機であって、
    　前記インナーハウジングの外周側が、前記アウターハウジングとの間で発生する締め代によって固定される
    　回転電機。     2. The rotating electric machine according to claim 1,
    an outer circumferential side of the inner housing is fixed by a tightening margin generated between the inner housing and the outer housing.
  6. 　請求項１に記載の回転電機であって、
    　前記固定子コアは、前記アウターハウジングの外周側から前記固定子コアに向かって圧入する治具によって、前記インナーハウジングの内周側に固定される
    　回転電機。     2. The rotating electric machine according to claim 1,
    the stator core is fixed to the inner periphery of the inner housing by a jig that presses the stator core from the outer periphery of the outer housing toward the stator core.
PCT/JP2022/042985 2022-11-21 2022-11-21 Rotary electric machine WO2024111020A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019017187A (en) * 2017-07-07 2019-01-31 Ntn株式会社 Rotary electric machine, in-wheel motor drive device including the same, and manufacturing method of rotary electric machine
WO2020213052A1 (en) * 2019-04-16 2020-10-22 日産自動車株式会社 Rotating electric machine
JP2022114150A (en) * 2021-01-26 2022-08-05 本田技研工業株式会社 Rotary electric machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019017187A (en) * 2017-07-07 2019-01-31 Ntn株式会社 Rotary electric machine, in-wheel motor drive device including the same, and manufacturing method of rotary electric machine
WO2020213052A1 (en) * 2019-04-16 2020-10-22 日産自動車株式会社 Rotating electric machine
JP2022114150A (en) * 2021-01-26 2022-08-05 本田技研工業株式会社 Rotary electric machine

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