JP3608280B2

JP3608280B2 - Processing method of rotor core

Info

Publication number: JP3608280B2
Application number: JP35058895A
Authority: JP
Inventors: 精石田; 憲昭岩渕; 竜一郎富永
Original assignee: Yaskawa Electric Corp
Current assignee: Yaskawa Electric Corp
Priority date: 1995-12-22
Filing date: 1995-12-22
Publication date: 2005-01-05
Anticipated expiration: 2015-12-22
Also published as: JPH09182386A

Description

【０００１】
【発明の属する技術分野】
本発明は、回転電機の回転子コアの外表面の仕上げ加工方法に関する。
【０００２】
【従来の技術】
従来、回転電機の回転子コアはプレス等で打ち抜いた円板状の電磁鋼板を積層して軸に焼き嵌めし、高速回転等で加工精度を極端に要求される場合は外表面を切削や研削加工により精密仕上げしていた。
【０００３】
【発明が解決しようとする課題】
ところが、回転子コアの外表面を切削や研削加工する場合は、プレス加工による大きなかえりは除去できるものの、切削や研削は機械的に表面を削り取るため、加工面に微小なかえりが残ったり、微細な切粉が積層面間に詰まることもあり、電磁鋼板間の絶縁を安定して得難く、回転子コアの表面に渦電流が生じ易かった。
【０００４】
【課題を解決するための手段】
上記課題を解決するため、本発明は、表面に絶縁被膜を施した電磁鋼板を所定の形状に打ち抜き、積層して形成した誘導電動機用の回転子コアの外表面を機械加工し、前記回転子コアの外表面以外の表面をマスキングし、その後エッチングする回転子コアの加工方法において、軸方向の両側から与圧し、外表面を軸方向に溶接して前記回転子コアを形成し、軸に前記回転子コアとＣＬリング補強用のカラを焼き嵌めしたのちに、エッチングをすることを特徴としており、請求項２に記載の発明は、表面に絶縁被膜を施した電磁鋼板を所定の形状に打ち抜き、積層して形成した磁気軸受用の回転子コアの外表面を機械加工し、前記回転子コアの外表面以外の表面をマスキングし、その後エッチングする回転子コアの加工方法において、前記回転子コアの両側面に密着させて前記回転子コアと非磁性体の円板状の変位検出器用のターゲットを軸に焼き嵌めした後に、エッチングをすることを特徴とするものである。
【０００５】
【発明の実施の形態】
表面に絶縁被膜を施した電磁鋼板を所定の形状に打ち抜き、積層して形成した回転子コアの外表面を機械加工したのち、外表面以外をマスキングし、エッチングする。
回転子コア外表面の微小なかえりや微細な切粉が除去され、渦電流の生じ難い回転子コアを製作出来る。
【０００６】
【実施例】
以下、図面に基づき実施例を説明する。
図１は、誘導電動機の回転子に適用する場合の、ワークを示す断面図である。
絶縁被膜を施した電磁鋼板を所定の形状に打ち抜いたコア多数枚を積層し、おのおのの電磁鋼板間に隙間が生じないように、軸方向の両側から与圧して、外表面を軸方向に溶接して回転子コア１を形成する。
軸に回転子コア１を焼き嵌めし、加工前のワークを形成する。
図２は、磁気軸受の回転子に適用する場合の、ワークを示す断面図である。
回転子コア１の両側面に密着させて、非磁性体の円板状のターゲット２を軸４に焼き嵌めし、加工前のワークを形成する。
図３は、誘導電動機の回転子に適用する場合の、他のワークを示す断面図である。
カラ２Ｃには、ＣＬリング１４を収納し、その外径側を接触・支持するくぼみ２１を設けてある。
短絡バー１３と両端のＣＬリング１４をダイカストにより一体にした回転子コア１の両側面に、ＣＬリング１４の外径側にカラ２Ｃのくぼみ２１の内径を密に接触させて、軸４に回転子コア１とカラ２Ｃを焼き嵌めし、加工前のワークを形成する。
なお、図示はしないが、リラクタンスモータやその他の回転電機の場合は、回転子コアを軸に焼き嵌めし、加工前のワークを形成する。
【０００７】
以下に、本発明の実施例の加工ステップを示す。
ステップ１加工前のワークを旋盤や研削盤にセットし、回転子コア１の外径を、エッチングによるミクロン・オーダの仕上げ代δを残した外径Ｄｏに加工し、エッチングする外表面１２を形成する。
ステップ２外表面１２以外の全ての面を、樹脂膜やテープ等のマスキング材５によりマスキングし、ワーク３を形成する。
ステップ３ワーク３を、例えば硝酸１０％と燐酸１０％を溶かした処理液を入れたエッチング漕（図示せず）にどぶ漬けし、外表面１２のみをエッチングする。
ステップ４エッチングが完了すると、エッチング漕からワーク３を引き上げ、回転子コア１の外表面に付着した処理液を水洗もしくは中和する。
ステップ５マスキング材５を剥離する。
【０００８】
図２のワークの場合は、ターゲット２を変位検出器のターゲットとしてそのまま使用し、図３のワークの場合は、両側のカラ２ＣをＣＬリング１４の補強部材としてそのまま使用する。
なお、ステップ２で形成したワーク３の回転子コア１の外表面１２に、処理液をハケ塗りしたり、スプレーで吹きつけ、所定時間経過後、回転子コア１の外表面に付着した処理液を水洗もしくは中和し、ステップ５に移行してもよい。この場合は、工程が簡単になる。
さらに、リラクタンスモータや永久磁石形同期電動機のように、円板を積層して形成した回転子コアに、本加工方法を適用できることは言うまでもない。
【０００９】
【発明の効果】
以上述べたように、本発明は、回転子コアの外表面のかえりと積層面間に目詰まりした切粉をエッチングによりほぼ完全に除去するので、おのおのの電磁鋼板が絶縁被膜を介し電気的にほぼ完全に絶縁され、回転子コア表面に渦電流が生じ難くなるという効果がある。
【図面の簡単な説明】
【図１】本発明を誘導電動機の回転子に適用する場合の、ワークを示す断面図。
【図２】本発明を磁気軸受の回転子に適用する場合の、ワークを示す断面図。
【図３】本発明を他の誘導電動機の回転子に適用する場合の、ワークを示す断面図。
【符号の説明】
１回転子コア
１２外表面
１３短絡バ−
１４ＣＬリング
２ターゲット
２ｃカラ
２１くぼみ
３ワーク
４軸
５マスキング材
δ 仕上げ代[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for finishing an outer surface of a rotor core of a rotating electrical machine.
[0002]
[Prior art]
Conventionally, the rotor core of a rotating electrical machine is made by laminating disc-shaped magnetic steel sheets punched with a press etc. and shrink-fitting on the shaft, and when the processing accuracy is extremely required by high-speed rotation etc., the outer surface is cut or ground Precision finished by processing.
[0003]
[Problems to be solved by the invention]
However, when cutting or grinding the outer surface of the rotor core, large burr due to pressing can be removed, but since cutting and grinding mechanically scrapes the surface, there is a slight burr remaining on the work surface. As a result, it was difficult to stably obtain insulation between the electromagnetic steel sheets, and eddy currents were easily generated on the surface of the rotor core.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is to machine the outer surface of a rotor core for an induction motor formed by punching a magnetic steel sheet having an insulating coating on a surface into a predetermined shape and laminating the rotor, In a method of processing a rotor core that masks a surface other than the outer surface of the core and then etches it, pressurization is performed from both sides in the axial direction, the outer surface is welded in the axial direction, and the rotor core is formed. Etching is performed after the rotor core and the collar for reinforcing the CL ring are shrink-fitted, and the invention according to claim 2 is for punching a magnetic steel sheet having an insulating coating on a surface into a predetermined shape. In the rotor core machining method, the outer surface of the rotor core for magnetic bearings formed by lamination is machined, the surface other than the outer surface of the rotor core is masked, and then etched. A disc-shaped target displacement detector of brought into close contact with both sides of the core the rotor core and non-magnetic material after the shrink fitting in the axial, and is characterized in that the etching.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
After the outer surface of the rotor core formed by laminating and laminating a magnetic steel sheet with an insulating coating on the surface is machined, the portions other than the outer surface are masked and etched.
By removing fine burr and fine chips on the outer surface of the rotor core, it is possible to manufacture a rotor core that is less likely to generate eddy currents.
[0006]
【Example】
Embodiments will be described below with reference to the drawings.
FIG. 1 is a cross-sectional view showing a workpiece when applied to a rotor of an induction motor.
A large number of cores made by punching electrical steel sheets with insulating coatings into a predetermined shape are stacked, and the outer surface is welded in the axial direction by applying pressure from both sides in the axial direction so that there is no gap between the magnetic steel sheets. Thus, the rotor core 1 is formed.
The rotor core 1 is shrink fitted on the shaft to form a workpiece before processing.
FIG. 2 is a cross-sectional view showing a workpiece when applied to a rotor of a magnetic bearing.
A non-magnetic disk-shaped target 2 is shrink-fitted onto the shaft 4 in close contact with both side surfaces of the rotor core 1 to form a workpiece before processing.
FIG. 3 is a cross-sectional view showing another workpiece when applied to a rotor of an induction motor.
The collar 2C is provided with a recess 21 that houses the CL ring 14 and contacts and supports the outer diameter side thereof.
The shorting bar 13 and the CL rings 14 at both ends are integrated with each other by die casting, the inner diameter of the hollow 21 of the collar 2C is in close contact with the outer diameter side of the CL ring 14, and the shaft 4 rotates. The child core 1 and the collar 2C are shrink-fitted to form a workpiece before processing.
Although not shown, in the case of a reluctance motor or other rotating electric machine, the rotor core is shrink-fitted around a shaft to form a workpiece before processing.
[0007]
The processing steps of the embodiment of the present invention are shown below.
Step 1 The workpiece before processing is set on a lathe or grinding machine, and the outer diameter of the rotor core 1 is processed into an outer diameter Do that leaves a finishing allowance δ of micron order by etching to form an outer surface 12 to be etched. To do.
Step 2 Mask all surfaces except the outer surface 12 with a masking material 5 such as a resin film or a tape to form the workpiece 3.
Step 3 The work 3 is immersed in an etching trough (not shown) containing a treatment solution in which, for example, 10% nitric acid and 10% phosphoric acid are dissolved, and only the outer surface 12 is etched.
Step 4 When the etching is completed, the work 3 is pulled up from the etching trough, and the treatment liquid adhering to the outer surface of the rotor core 1 is washed or neutralized.
Step 5 The masking material 5 is peeled off.
[0008]
In the case of the workpiece of FIG. 2, the target 2 is used as it is as the target of the displacement detector, and in the case of the workpiece of FIG. 3, the collars 2 </ b> C on both sides are used as they are as the reinforcing members of the CL ring 14.
In addition, the treatment liquid is applied to the outer surface 12 of the rotor core 1 of the work 3 formed in Step 2 by brushing or spraying with a spray, and after a predetermined time has elapsed, the treatment liquid adhered to the outer surface of the rotor core 1. May be washed with water or neutralized, and the process may proceed to Step 5. In this case, the process becomes simple.
Furthermore, it goes without saying that the present processing method can be applied to a rotor core formed by stacking disks such as a reluctance motor and a permanent magnet synchronous motor.
[0009]
【The invention's effect】
As described above, the present invention removes clogged chips between the burr on the outer surface of the rotor core and the laminated surface almost completely by etching, so that each electrical steel sheet is electrically connected via an insulating coating. There is an effect that eddy currents are hardly generated on the surface of the rotor core, being almost completely insulated.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a workpiece when the present invention is applied to a rotor of an induction motor.
FIG. 2 is a cross-sectional view showing a workpiece when the present invention is applied to a rotor of a magnetic bearing.
FIG. 3 is a sectional view showing a workpiece when the present invention is applied to a rotor of another induction motor.
[Explanation of symbols]
1 Rotor core 12 Outer surface 13 Short-circuit bar
14 CL ring 2 Target 2c Color 21 Indent 3 Work 4 Axis 5 Masking material δ Finishing allowance

Claims

A magnetic steel sheet with an insulating coating on the surface is punched into a predetermined shape, the outer surface of the rotor core for induction motors formed by lamination is machined, and the surface other than the outer surface of the rotor core is masked, In the processing method of the rotor core to be etched thereafter ,
Applying pressure from both sides in the axial direction, welding the outer surface in the axial direction to form the rotor core, and performing etching after shrinking the rotor core and the collar for reinforcing the CL ring on the shaft. A method for processing a rotor core.

Punching a magnetic steel sheet with an insulating coating on the surface into a predetermined shape, machining the outer surface of the rotor core for magnetic bearing formed by lamination , masking the surface other than the outer surface of the rotor core , In the processing method of the rotor core to be etched thereafter,
Rotor core processing characterized in that etching is performed after the rotor core and a non-magnetic disc-shaped target for a displacement detector are closely fitted to both sides of the rotor core and shrink-fitted on a shaft. Method.