JPH11299144A - Structure of rotor and working of groove in high-speed rotary machine - Google Patents
Structure of rotor and working of groove in high-speed rotary machineInfo
- Publication number
- JPH11299144A JPH11299144A JP10108465A JP10846598A JPH11299144A JP H11299144 A JPH11299144 A JP H11299144A JP 10108465 A JP10108465 A JP 10108465A JP 10846598 A JP10846598 A JP 10846598A JP H11299144 A JPH11299144 A JP H11299144A
- Authority
- JP
- Japan
- Prior art keywords
- groove
- secondary conductor
- conductor metal
- diameter portion
- shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004020 conductor Substances 0.000 claims abstract description 25
- 229910052751 metal Inorganic materials 0.000 claims abstract description 24
- 239000002184 metal Substances 0.000 claims abstract description 24
- 239000000696 magnetic material Substances 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 6
- 238000004880 explosion Methods 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052802 copper Inorganic materials 0.000 abstract description 7
- 239000010949 copper Substances 0.000 abstract description 7
- 238000005304 joining Methods 0.000 abstract description 3
- 238000003466 welding Methods 0.000 abstract description 2
- 230000002706 hydrostatic effect Effects 0.000 abstract 2
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 238000005474 detonation Methods 0.000 abstract 1
- 239000002360 explosive Substances 0.000 abstract 1
- 239000011162 core material Substances 0.000 description 9
- 230000006698 induction Effects 0.000 description 4
- 238000003672 processing method Methods 0.000 description 4
- 238000010409 ironing Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/02—Asynchronous induction motors
- H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
- H02K17/168—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors having single-cage rotors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Induction Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Manufacture Of Motors, Generators (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、一般に高速回転機
を用いたターボコンプレッサ、タービン発電機等に関
し、特に高速回転機の回転子構造と溝の加工方法の改良
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a turbo compressor, a turbine generator and the like using a high-speed rotating machine, and more particularly to an improvement of a rotor structure and a groove machining method of a high-speed rotating machine.
【０００２】[0002]
【従来の技術】回転子全体が鋼塊で軸と一体的に加工さ
れているソリッドロータを用いた誘導機は二次抵抗値が
高いので始動トルクが大きく巻取機などに用いられてい
た。しかし、ソリッドロータは元来軸と一体加工されて
いるので、機械的強度が優れており高速機に適用できる
はずであるが、アルミ材や鋼材を使用したかご形ロータ
に比べると二次抵抗値が高いため、運転中の滑りが大き
く効率が悪くインバータモータなどには適用できない。
また二次損失が大きいため、運転中に温度が上昇しバラ
ンスが取り難いこともあり高速機への適用に対する課題
となっていた。そこで、本出願人は先願として出願中の
実願平１−１１３４２４号により、誘導機のソリッドロ
ータの円周面に、高導電率の金属を接着することにより
渦電流回路を形成するようにして上記の問題点を解決す
る考案を出願しており、その概要は以下の通りである。
高速回転誘導機の回転子の半体部分図を図４に、図４の
Ａ−Ａ断面を図５に示し、その構造を説明すると、磁性
体軸（心材）１の大径部１ａに長手方向に半径Ｒの溝２
が切削により複数個設けられ、この溝２と大径部１ａの
端部１ｂとに、高導電性の二次導体金属３、例えば銅が
溶射や肉盛り溶接などで接着され、機械加工により大径
部１ａと、その表面のつら（面）一表面３ａ及び短絡部
３ｂが仕上げられる。溝部のこの構造により、磁性体軸
１の表面に生ずる渦電流は、主に高導電性の二次導体金
属３の部分を流れるので、二次抵抗が低いため効率が良
く温度上昇も低いという利点を有する。2. Description of the Related Art An induction machine using a solid rotor in which the entire rotor is made of steel ingot and integrally formed with a shaft has a high secondary resistance value, and therefore has a large starting torque and has been used for winding machines and the like. However, since solid rotors are originally processed integrally with the shaft, they have excellent mechanical strength and should be applicable to high-speed machines.However, the secondary resistance is lower than that of a cage rotor using aluminum or steel. Therefore, it is not applicable to inverter motors and the like due to large slippage during operation and low efficiency.
In addition, since the secondary loss is large, the temperature rises during operation and it is difficult to achieve a balance. Therefore, the present applicant has made Japanese Patent Application No. 1-113424, which has been filed as a prior application, to form an eddy current circuit by bonding high conductivity metal to the circumferential surface of a solid rotor of an induction machine. The applicant has filed an application for solving the above problems, and the outline is as follows.
FIG. 4 is a partial view of the rotor of the high-speed rotary induction machine, and FIG. 5 is a cross-sectional view taken along the line AA of FIG. 4. Groove 2 with radius R in the direction
A plurality of highly conductive secondary conductor metals 3, for example, copper, are adhered to the groove 2 and the end 1b of the large diameter portion 1a by thermal spraying or overlay welding. The diameter part 1a, the icicle (surface) one surface 3a and the short-circuit part 3b of the surface are finished. Due to this structure of the groove, the eddy current generated on the surface of the magnetic material shaft 1 mainly flows through the highly conductive secondary conductor metal 3, so that the secondary resistance is low, so that the efficiency is high and the temperature rise is low. Having.
【０００３】また、別の従来技術として特開昭５１−２
８６０５号公報には、『かご形巻線の製造法』と題する
技術が開示されている。この技術は、同公報の特許請求
の範囲に記載されているように、外表面に開口するスロ
ットを形成した回転子の外周に導電管をはめ込み、この
導電管の上からしごき加工を施すことによって上記導電
管を上記スロット内にめり込ませた後、外表面に上記回
転子鉄心の外径に合わせて切削加工を施すことにより、
端絡環と一体の導体バーを構成することを特徴とする、
かご形巻線の製造法である。As another prior art, Japanese Patent Laid-Open No.
No. 8605 discloses a technique entitled "Method of manufacturing a cage winding". According to this technique, as described in the claims of the publication, a conductive tube is fitted on the outer periphery of a rotor having a slot formed in the outer surface, and ironing is performed on the conductive tube. After the conductive tube is sunk into the slot, by cutting the outer surface to the outer diameter of the rotor core,
Characterized by constituting a conductor bar integral with the end ring,
This is a method of manufacturing a cage winding.
【０００４】[0004]
【発明が解決しようとする課題】ところで、上記の本出
願人の先願である実願平１−１１３４２４号に開示され
た回転子では、（１）溶射や肉盛り溶接による熱影響を
受けて、心材や高導電性の二次導体金属の強度が低下す
る、（２）図６に示すように溝の半径を変更することに
より溝の断面積を変更するに際し、例えばＲ1、Ｒ2、Ｒ
3・・・等の種々の半径を有する数種類の工具を用意
し、同一の中心から同心円的に異なる半径で溝部を切削
していた、（３）心材１と高導電性の二次導体金属３と
の接合は接着であるので、高速回転による遠心力に対し
強度が懸念される、などの問題があった。The rotor disclosed in Japanese Utility Model Application No. Hei 1-113424, which is a prior application of the applicant of the present invention, has the following problems. (2) When the cross-sectional area of the groove is changed by changing the radius of the groove as shown in FIG. 6, for example, R 1 , R 2 , R
Several kinds of tools having various radii such as 3 ... Were prepared, and grooves were cut from the same center concentrically with different radii. (3) Core material 1 and highly conductive secondary conductor metal 3 Since bonding is performed by bonding, there is a problem that the strength is feared against centrifugal force due to high-speed rotation.
【０００５】また、前記の特開昭５１−２８６０５号公
報に開示された技術では、図７に示すように、絞り治具
３０により銅管の一端側を、回転子鉄心１０の端絡環１
２のテーパ１２ａに沿った形状に絞り加工する。次に、
図８に示すように、支え台４１の上に、 しごき治具４２
を装着し、その上に銅管２０を装着した回転子鉄心１０
を、銅管絞り側１２ａを下にして配置して、更にしごき
治具４２の上に回転子鉄心１０および銅管２０を包囲す
るように回転子支え治具４３を配置すること、ならび
に、回転子支え治具４３に装着された回転子鉄心１０の
上部にプレス用治具４４を使用して加圧すること、など
が記載されていて、特に大型の機構の場合、ある程度の
冷間加工施設を有する企業でないと加工できないという
問題が有り対策が要望されていた。According to the technique disclosed in Japanese Patent Laid-Open Publication No. Sho 51-28605, one end of a copper tube is connected to an end ring 1 of a rotor core 10 by a drawing jig 30 as shown in FIG.
2 is drawn to a shape along the second taper 12a. next,
As shown in FIG. 8, an ironing jig 42
And a rotor core 10 on which a copper tube 20 is mounted.
Are arranged with the copper tube drawing side 12a facing down, and a rotor support jig 43 is further arranged on the ironing jig 42 so as to surround the rotor core 10 and the copper tube 20. Pressing using a pressing jig 44 on the upper part of the rotor core 10 mounted on the child supporting jig 43 is described. Particularly, in the case of a large mechanism, a certain amount of cold working facility is required. There is a problem that processing cannot be performed unless the company has this, and measures have been demanded.
【０００６】[0006]
【課題を解決するための手段】本発明では、磁性体軸の
溝に高導電性の二次導体金属を熱間静水圧処理（ＨＩ
Ｐ）あるいは爆着などの手段で強固に接合させ、前記溝
の加工は、半径が１種類の工具を用いて溝の中心の位置
を上、下に調整し溝断面積を変更する加工方法によって
上記の課題を解決した。According to the present invention, a highly conductive secondary conductor metal is hot-hydrostatically treated (HI) in a groove of a magnetic material shaft.
P) or bonding by means of explosion or the like, and processing of the groove is performed by adjusting the center position of the groove upward and downward by using a tool of one radius to change the groove cross-sectional area. The above problem has been solved.
【０００７】[0007]
【発明の実施の形態】本発明による高速回転機の回転子
の半体部分図を図１に、図１のＡ−Ａ断面を図２に、図
２の溝部分を図３に示す。図１と図２を参照すると、回
転子の磁性体軸２１に高導電性の二次導体金属２３、例
えば銅がＨＩＰ、爆着などにより磁性体軸２１の大径部
２１ａの長手方向に等角度間隔に設けられた溝部２２、
及び大径部２１ａの端部２１ｂに強固に接合され、つら
（面）一表面を有する部分２３ａと短絡部２３ｂが形成
される。しかし、従来とは異なり、図２に示すように溝
部２２と隣の溝部２２との間の大径部２１ａの外表面
に、厚さｔが１ｍｍ以下の二次導体金属２３で全面的に
覆われて高速回転の遠心力に対しても、二次導体金属２
３が円周方向に連続した接合する構成としたので一層強
固になる。短絡部２３ｂへの二次導体金属２３の被覆の
厚さｔは、１ｍｍ以下と薄いので、この短絡部２３ｂの
存在により、高導電性の二次導体金属２３による磁気特
性の悪化を防止できる。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partial view of a half of a rotor of a high-speed rotating machine according to the present invention, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG. Referring to FIGS. 1 and 2, a highly conductive secondary conductor metal 23, for example, copper is formed on the magnetic body shaft 21 of the rotor in the longitudinal direction of the large diameter portion 21 a of the magnetic body shaft 21 by HIP, explosion, or the like. Grooves 22 provided at angular intervals,
And it is firmly joined to the end 21b of the large diameter portion 21a, and a portion 23a having one icicle (surface) surface and a short-circuit portion 23b are formed. However, unlike the related art, as shown in FIG. 2, the outer surface of the large-diameter portion 21a between the groove 22 and the adjacent groove 22 is entirely covered with a secondary conductor metal 23 having a thickness t of 1 mm or less. The secondary conductor metal 2
3 is further strengthened because it is configured to be joined continuously in the circumferential direction. Since the thickness t of the coating of the secondary conductor metal 23 on the short-circuit portion 23b is as thin as 1 mm or less, the presence of the short-circuit portion 23b can prevent deterioration of magnetic properties due to the highly conductive secondary conductor metal 23.
【０００８】さらに、溝加工を行う場合には、溝部２２
の断面積を調整する際に、図３に示すように半径Ｒの切
削工具（例えば、平面研削盤）を１種類だけ用い、図３
を参照すれば理解できるように、半径Ｒの中心位置Ｌ
を、Ｌ1、Ｌ2、Ｌ3、・・・のように変化させれば、溝
部２２の断面積を変更することができるので１種類の加
工具で溝加工を行い得る。Further, when the groove is formed, the groove 22
When adjusting the cross-sectional area of the workpiece, only one type of cutting tool (for example, a surface grinder) having a radius R is used as shown in FIG.
As can be understood by referring to FIG.
Is changed to L 1 , L 2 , L 3 ,..., The cross-sectional area of the groove portion 22 can be changed, so that the groove processing can be performed with one type of processing tool.
【０００９】[0009]
【発明の効果】本発明の高速回転機の回転子構造は、上
記のように心材と二次導体金属の接合を、ＨＩＰまたは
爆着などで行うようにしたため、従来のような熱影響
で、心材や二次導体金属の強度低下を来すことなく、溝
内の二次導体金属と隣の溝内の二次導体金属とは円周方
向に連結されているので、益々強固な接合が得られる。
さらに、前記回転子の溝の断面積を調整する際には、所
定の半径の１種類の加工具を使用し、その加工具の中心
の位置を変更して溝加工を行うようにした加工方法とす
ると、溝加工の工具は１種類用意すれば良いという利点
を有する。According to the rotor structure of the high-speed rotating machine of the present invention, the joining of the core material and the secondary conductor metal is performed by HIP or explosion as described above. Because the secondary conductor metal in the groove and the secondary conductor metal in the adjacent groove are connected in the circumferential direction without lowering the strength of the core material and the secondary conductor metal, stronger and stronger joints are obtained. Can be
Further, when adjusting the cross-sectional area of the groove of the rotor, a processing method using one type of processing tool having a predetermined radius and changing the center position of the processing tool to perform the groove processing. Then, there is an advantage that only one kind of groove machining tool needs to be prepared.
【図１】本発明による高速回転機の回転子の半体部分図
である。FIG. 1 is a partial partial view of a rotor of a high-speed rotating machine according to the present invention.
【図２】図１のＡ−Ａ断面図である。FIG. 2 is a sectional view taken along line AA of FIG.
【図３】図２に示す溝部の説明図である。FIG. 3 is an explanatory view of a groove shown in FIG. 2;
【図４】従来技術による高速回転誘導機の回転子の半体
部分図である。FIG. 4 is a partial half view of a rotor of a high-speed rotary induction machine according to the prior art.
【図５】図４のＡ−Ａ断面図である。FIG. 5 is a sectional view taken along line AA of FIG. 4;
【図６】図５に示す溝の加工方法を示す説明図である。FIG. 6 is an explanatory view showing a method of processing the groove shown in FIG. 5;
【図７】特開昭５１−２８６０５号公報による加工方法
の一部を示す側断面図である。FIG. 7 is a side sectional view showing a part of a processing method according to JP-A-51-28605.
【図８】図７の加工方法に次いで行われる加工方法の一
部を示す側断面図である。8 is a side sectional view showing a part of a processing method performed after the processing method of FIG. 7;
２１：磁性体軸（心材） ２１ａ：大径部 ２１ｂ：軸方向の端部 ２２：溝部 ２３：二次導体金属 ２３ｂ：短絡部 Ｒ：半径 21: Magnetic material shaft (core material) 21a: Large diameter portion 21b: End portion in the axial direction 22: Groove portion 23: Secondary conductor metal 23b: Short circuit portion R: Radius
Claims (3)
て、その大径部（２１ａ）の円周面の軸方向に平行に複
数本のほぼ半円弧状の溝部（２２）を有し、当該溝部
（２２）と溝部（２２）の間の短絡部（２３ｂ）を被覆
する厚さが所定値以下となるように、上記大径部（２１
ａ）の円周面全体と、上記大径部（２１ａ）の軸端部
（２１ｂ）を高導電性の二次導体金属（２３）で被覆す
るようにしたことを特徴とする高速回転機の回転子構
造。A magnetic shaft (21) of a high-speed rotating machine has a plurality of substantially semicircular grooves (22) parallel to an axial direction of a circumferential surface of a large diameter portion (21a) thereof. The large-diameter portion (21) is so formed that the thickness covering the short-circuit portion (23b) between the groove portion (22) and the groove portion (22) becomes a predetermined value or less.
A high-speed rotating machine characterized in that the entire circumferential surface of (a) and the shaft end (21b) of the large diameter portion (21a) are covered with a highly conductive secondary conductor metal (23). Rotor structure.
着などにより、磁性体軸（２１）に強固に接合して被覆
するようにしたことを特徴とする請求項１記載の高速回
転機の回転子構造。2. The high-speed rotating device according to claim 1, wherein said secondary conductor metal (23) is firmly joined to and covered with the magnetic material shaft (21) by HIP, explosion, or the like. Machine rotor structure.
機の磁性体軸（２１）の大径部（２１ａ）の溝部（２
２）を加工する際、所定の半径（Ｒ）を有する加工具を
使用し、この加工具の中心から上記磁性体軸（２１）の
中心までの距離を変更することにより、溝部（２２）の
断面積を調整することを可能としたことを特徴とする溝
の加工方法。3. The groove (2) of the large diameter portion (21a) of the magnetic shaft (21) of the high-speed rotating machine according to claim 1 or 2.
When processing 2), a processing tool having a predetermined radius (R) is used, and by changing the distance from the center of the processing tool to the center of the magnetic material shaft (21), the groove (22) can be formed. A method of processing a groove, wherein a cross-sectional area can be adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10108465A JPH11299144A (en) | 1998-04-06 | 1998-04-06 | Structure of rotor and working of groove in high-speed rotary machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10108465A JPH11299144A (en) | 1998-04-06 | 1998-04-06 | Structure of rotor and working of groove in high-speed rotary machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11299144A true JPH11299144A (en) | 1999-10-29 |
Family
ID=14485458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10108465A Pending JPH11299144A (en) | 1998-04-06 | 1998-04-06 | Structure of rotor and working of groove in high-speed rotary machine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11299144A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010011641A (en) * | 2008-06-27 | 2010-01-14 | Kofu Meidensha Electric Mfg Co Ltd | Rotor of induction motor and method of manufacturing the same |
| JP4560755B2 (en) * | 2000-11-02 | 2010-10-13 | 株式会社Ｉｈｉ | Induction motor rotor manufacturing method |
| KR101041389B1 (en) | 2010-01-20 | 2011-06-14 | 주식회사 알피에스 | All-in-one ultrahigh speed shaft with rotor and manufacturing method of the same |
| WO2013127717A1 (en) * | 2012-02-28 | 2013-09-06 | Alfred Jaeger Gmbh | Squirrel-cage rotor for a small motor and method for the production thereof |
| WO2015071468A3 (en) * | 2013-11-15 | 2015-08-06 | Coreteq Systems Ltd | Line start permanent magnet motor using a modular rotor |
| US10199897B2 (en) | 2013-11-15 | 2019-02-05 | COREteQ Systems Ltd. | Very high temperature stator construction |
| US10340777B2 (en) | 2013-11-15 | 2019-07-02 | COREteQ Systems Ltd. | Line start permanent magnet motor |
| US10367400B2 (en) | 2013-11-15 | 2019-07-30 | COREteQ Systems Ltd. | Line start permanent magnet motor using a hybrid rotor |
| US10523077B2 (en) | 2013-11-15 | 2019-12-31 | Coreteq System Ltd. | Very high temperature electrical winding |
| FR3127086A1 (en) * | 2021-09-14 | 2023-03-17 | Safran Helicopter Engines | Electric motor rotor |
-
1998
- 1998-04-06 JP JP10108465A patent/JPH11299144A/en active Pending
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| JP4560755B2 (en) * | 2000-11-02 | 2010-10-13 | 株式会社Ｉｈｉ | Induction motor rotor manufacturing method |
| JP2010011641A (en) * | 2008-06-27 | 2010-01-14 | Kofu Meidensha Electric Mfg Co Ltd | Rotor of induction motor and method of manufacturing the same |
| KR101041389B1 (en) | 2010-01-20 | 2011-06-14 | 주식회사 알피에스 | All-in-one ultrahigh speed shaft with rotor and manufacturing method of the same |
| WO2013127717A1 (en) * | 2012-02-28 | 2013-09-06 | Alfred Jaeger Gmbh | Squirrel-cage rotor for a small motor and method for the production thereof |
| US10199897B2 (en) | 2013-11-15 | 2019-02-05 | COREteQ Systems Ltd. | Very high temperature stator construction |
| GB2537276A (en) * | 2013-11-15 | 2016-10-12 | Coreteq Ltd | Line start permanent magnet motor using a modular rotor |
| WO2015071468A3 (en) * | 2013-11-15 | 2015-08-06 | Coreteq Systems Ltd | Line start permanent magnet motor using a modular rotor |
| US10340779B2 (en) | 2013-11-15 | 2019-07-02 | COREteQ Systems Ltd. | Line start permanent magnet motor using a modular rotor |
| US10340777B2 (en) | 2013-11-15 | 2019-07-02 | COREteQ Systems Ltd. | Line start permanent magnet motor |
| US10367400B2 (en) | 2013-11-15 | 2019-07-30 | COREteQ Systems Ltd. | Line start permanent magnet motor using a hybrid rotor |
| US10523077B2 (en) | 2013-11-15 | 2019-12-31 | Coreteq System Ltd. | Very high temperature electrical winding |
| GB2537276B (en) * | 2013-11-15 | 2022-04-20 | Coreteq Systems Ltd | Line start permanent magnet motor using a modular rotor |
| FR3127086A1 (en) * | 2021-09-14 | 2023-03-17 | Safran Helicopter Engines | Electric motor rotor |
| WO2023041873A1 (en) * | 2021-09-14 | 2023-03-23 | Safran Helicopter Engines | Electric motor rotor |
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