JPH07245921A - Magnet rotor and manufacture thereof - Google Patents
Magnet rotor and manufacture thereofInfo
- Publication number
- JPH07245921A JPH07245921A JP6072428A JP7242894A JPH07245921A JP H07245921 A JPH07245921 A JP H07245921A JP 6072428 A JP6072428 A JP 6072428A JP 7242894 A JP7242894 A JP 7242894A JP H07245921 A JPH07245921 A JP H07245921A
- Authority
- JP
- Japan
- Prior art keywords
- metal tube
- magnet
- outer peripheral
- magnet rotor
- metal
- 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
Landscapes
- Manufacture Of Motors, Generators (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、インナーロータ型の電
動機に用いられる氷久磁石を装着した回転子に関し、特
に耐遠心力のための保護部材によって磁石を保護してな
る回転子に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor equipped with an ice permanent magnet used in an inner rotor type electric motor, and more particularly to a rotor in which the magnet is protected by a protective member for centrifugal force resistance.
【０００２】[0002]
【従来の技術】密閉型圧縮機等に使用される磁石回転子
は、遠心力によって磁石が飛散しないための補強と、磁
石粉等が回転子外部へ漏れないための密閉とを目的とし
て、保護部材によって回転子の外周部と軸方向両端部を
それぞれ積って構成される。2. Description of the Related Art Magnet rotors used in hermetic compressors are protected for the purpose of reinforcing them so that the magnets do not scatter due to centrifugal force and sealing them so that magnet powder does not leak outside the rotor. The outer peripheral portion of the rotor and both axial end portions are stacked by the members.
【０００３】図１及び図２を用いて上記回転子の構造を
説明する。この回転子は、厚肉円筒形のヨーク１の外周
部に瓦状の磁石２を複数個配置し、この磁石２の外周部
に薄肉の金属管３を嵌着し、一方磁石２の軸方向両端に
は端板４，４を装着して構成されている。The structure of the rotor will be described with reference to FIGS. 1 and 2. In this rotor, a plurality of tile-shaped magnets 2 are arranged on the outer peripheral portion of a thick-walled cylindrical yoke 1, and a thin metal tube 3 is fitted on the outer peripheral portion of the magnet 2, while the magnet 2 is axially oriented. End plates 4 and 4 are attached to both ends.
【０００４】ヨーク１は、中心部に軸孔６を有し、一般
に円形薄鉄板を多数積層してカシメクランプ部７によっ
て薄鉄板相互をかしめて固着することにより形成され
る。磁石２はフェライト等の硬質磁性材により形成され
た瓦状片よりなり、これを複数個略等配状に配置して、
金属管３の締め付けによって固定する。The yoke 1 has a shaft hole 6 in the center thereof, and is generally formed by laminating a large number of circular thin iron plates and caulking and clamping the thin iron plates with a caulking clamp portion 7. The magnet 2 is made of a tile-shaped piece made of a hard magnetic material such as ferrite.
It is fixed by tightening the metal tube 3.
【０００５】金属管３は、耐遠心力のための補強と外周
部の密封を行うものであり、引張強度に優れ且つ非磁性
体のものが適するため、一般にオーステナイト系ステン
レス鋼等が用いられ、図４に示すように、板状素材を丸
めて溶接部１０にて溶接することによって管状に形成
し、これを焼きばめまたは圧入またはその両方の組み合
わせによって嵌着する。端板４，４は、磁石２の軸方向
両端部を密閉するものであり、金属製の円形平板が使用
される。端板４，４と金属管３とはすきま嵌合となって
おり、端板４，４とヨーク鉄心１とはそれぞれの内部を
軸方向に貫通する複数のクランプピン５によって相互が
固定されている。尚、９は金属管３の端部を内径側へ折
り曲げて形成した折り曲げ部であり、このような折り曲
げ部９を設けることにより、端板４との隙間を小さくし
て密閉効果を向上させ、同時に金属管３の抜け止めを図
っている。The metal tube 3 is for reinforcing the centrifugal force and for sealing the outer peripheral portion. Since it is excellent in tensile strength and a non-magnetic material is suitable, austenitic stainless steel or the like is generally used. As shown in FIG. 4, a plate-shaped material is rolled into a tubular shape by welding at a welded portion 10, and the tubular material is fitted by shrink-fitting, press-fitting, or a combination of both. The end plates 4 and 4 seal both axial end portions of the magnet 2, and metal circular flat plates are used. The end plates 4 and 4 and the metal tube 3 are clearance-fitted, and the end plates 4 and 4 and the yoke iron core 1 are fixed to each other by a plurality of clamp pins 5 penetrating axially in the inside. There is. Reference numeral 9 is a bent portion formed by bending the end portion of the metal tube 3 toward the inner diameter side. By providing such a bent portion 9, the gap with the end plate 4 is reduced and the sealing effect is improved. At the same time, the metal tube 3 is prevented from coming off.
【０００６】また、金属管と磁石とをすきま嵌合する場
合は、図３に示すように、金属管３ａの端部に端板４
ａ，４ａをかぶせて金属管３ａの抜け止めを行い、磁石
２の相互間の隙間８等に樹脂を充填して磁石２を固定し
て構成する。When the metal tube and the magnet are fitted in a clearance, the end plate 4 is attached to the end of the metal tube 3a as shown in FIG.
The metal tube 3a is covered with a and 4a to prevent the metal tube 3a from coming off, and the gap 2 between the magnets 2 is filled with resin to fix the magnet 2.
【０００７】[0007]
【発明が解決しようとする課題】上記従来の回転子にお
いては、電動機固定子のスロットリップルに起因する空
間高調波成分、あるいはＰＷＭ型インバータ電源の電流
波形中の時間高調波成分によって、電動機の運転に伴っ
て金属管３に渦電流が発生するため、この渦電流による
損失が電動機の効率を低下させている。この損失を低減
する例として、特公昭６３−２６６２３号公報に開示さ
れる構成が提案されている。これは金属管３にスリット
を設けて渦電流の通路が細分化されるようにした構成で
あるが、磁石２の密封が必要とされる用途には使用でき
ないといった欠点や、前記スリットによって金属管の耐
遠心力強度が低下するといった欠点が存在する。In the conventional rotor described above, the operation of the electric motor is caused by the spatial harmonic component caused by the slot ripple of the electric motor stator or the time harmonic component in the current waveform of the PWM type inverter power supply. As a result, an eddy current is generated in the metal tube 3, and the loss due to this eddy current reduces the efficiency of the electric motor. As an example of reducing this loss, a configuration disclosed in Japanese Patent Publication No. 63-26623 is proposed. This is a configuration in which a slit is provided in the metal tube 3 so that the passage of the eddy current is subdivided, but it has a drawback that it cannot be used in applications where the magnet 2 needs to be sealed, and the slit causes the metal tube to be used. However, there is a drawback that the strength of centrifugal force is lowered.
【０００８】また、特開昭５９−１４８５５５号公報に
開示される構成のように、金属管に代えて金属線をコイ
ル状に巻回して構成しても同様の効果が得られるが、こ
の場合も金属線だけでは磁石の密封ができないために、
樹脂等によってモールドする必要が生じて、材料費等が
コストアップとなってしまう欠点がある。さらに連続し
た金属線を巻回した構成であるため、金属線が一箇所で
も切れるとすべての保護部材が破壊してしまう危険が存
在する。Further, as in the structure disclosed in Japanese Patent Laid-Open No. 59-148555, the same effect can be obtained by winding a metal wire in a coil shape instead of the metal tube. In this case, Since the magnet cannot be sealed only with a metal wire,
There is a drawback that the cost of materials and the like increases due to the necessity of molding with resin or the like. Further, since the continuous metal wire is wound, there is a risk that all the protective members will be broken if the metal wire is cut even at one place.
【０００９】従って、金属管によって磁石を密封し、且
つ高速回転に供する回転子にあっては、上記渦電流によ
る損失を低減するために、肉厚の薄い金属管を使用する
検討がなされてきた。ところがこの場合も、肉厚を薄く
することにより金属管の耐遠心力強度が低下するため
に、金属管が破損して磁石が飛散するといった品質保証
上の限界が存在する。特にオーステナイト系ステンレス
鋼の場合は、熱処理によって強度を高めることができな
い点が障害となっている。Therefore, in a rotor in which a magnet is hermetically sealed by a metal tube and which is subjected to high speed rotation, studies have been made to use a thin metal tube in order to reduce the loss due to the eddy current. . However, also in this case, the centrifugal resistance strength of the metal tube is reduced by reducing the wall thickness, so that there is a limit in quality assurance that the metal tube is damaged and the magnets scatter. Particularly, in the case of austenitic stainless steel, there is an obstacle in that strength cannot be increased by heat treatment.
【００１０】[0010]
【課題を解決するための手段】本発明による磁石回転子
は、金属管の内外周面の一方または両方に凹凸部を設け
たものである。A magnet rotor according to the present invention comprises a metal tube provided with an uneven portion on one or both of its inner and outer peripheral surfaces.
【００１１】また本発明による磁石回転子の製造方法
は、金属管の嵌着に先立って、金属管の内外周面の一方
または両方に凹凸部を設けるとともに、その内径が前記
磁石の外周部へ嵌入可能な寸法となるように拡管成形す
るものである。上記凹凸部を設けるに際しては、金属管
の面上を押圧または切削することによって凹凸を形成す
る。Further, in the method for manufacturing a magnet rotor according to the present invention, prior to the fitting of the metal tube, the uneven portion is provided on one or both of the inner and outer peripheral surfaces of the metal tube, and the inner diameter of the uneven portion is the outer peripheral portion of the magnet. The pipe is expanded so that the size can be fitted. When providing the uneven portion, the unevenness is formed by pressing or cutting the surface of the metal tube.
【００１２】[0012]
【作用】凹凸部の存在によって、渦電流のループが細分
化されて渦電流の絶対値が低下する。また金属管の周面
に凹凸を設けると同時に拡管成形を施すことによって、
金属管の凹凸にかかわらず、常に良好な寸法精度を得る
ことができる。With the presence of the uneven portion, the eddy current loop is subdivided and the absolute value of the eddy current is reduced. Also, by providing unevenness on the peripheral surface of the metal tube and at the same time performing tube expansion molding,
It is possible to always obtain good dimensional accuracy regardless of the unevenness of the metal tube.
【００１３】[0013]
【実施例】本発明による回転子の構成は、図１乃至図３
の実施例に示す通りであり、全体的な構成に関しては従
来の技術の欄にて説明済みのため省略する。本発明にお
いては、磁石２の外周部へ嵌着された金属管３，３ａ
は、該嵌着に先立ってその内外周面の一方または両方に
塑性変形が与えられる。金属管３，３ａの材料として
は、例えばＳＵＳ３０４のステンレスの板材を用い、
０．３ｍｍ厚，０．４ｍｍ厚等の標準肉厚の中から選定
する。即ち先ず、図４に示すように、標準肉厚の生板材
を丸めて溶接して管状に形成し、端部を所定寸法にカッ
トして素管３ｂを形成する。図中１０は溶接部を示して
いる。生板材は伸びに裕度があるため、容易に丸めるこ
とができて比較的良好な円筒を得ることができる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The rotor according to the present invention is constructed as shown in FIGS.
The description is omitted because the overall configuration has already been described in the section of the related art. In the present invention, the metal tubes 3, 3a fitted to the outer peripheral portion of the magnet 2 are used.
Is plastically deformed on one or both of its inner and outer peripheral surfaces prior to the fitting. As the material of the metal tubes 3 and 3a, for example, a stainless steel plate material of SUS304 is used,
Select from standard thicknesses such as 0.3 mm and 0.4 mm. That is, first, as shown in FIG. 4, a green plate material having a standard thickness is rolled and welded to form a tubular shape, and the end portion is cut to a predetermined size to form a raw tube 3b. In the figure, 10 indicates a welded portion. Since the green plate material has a margin of elongation, it can be easily rolled and a relatively good cylinder can be obtained.
【００１４】次に、この素管３ｂを図５に示すような成
形装置にセットする。この成形装置は、環状に配置され
たテーパ状の内径を有する押圧治具１５と、この押圧治
具１５の内側に嵌入されたテーパピン２０と、金属管３
ｂに外嵌された外コレット１８と、この外コレット１８
をテーパ面によって保持するコレットホルダ１９とによ
って構成され、テーパピン２０を図５の紙面に垂直な方
向にスライドさせると、テーパピン２０のテーパ状の外
周面と摺接する押圧治具１５の内周部が外径方向へ押圧
されて押圧治具１５が拡開し、押圧治具１５の外周面に
よって金属管３ｂの内周面が押圧を受けるように構成さ
れている。Next, the raw tube 3b is set in a molding apparatus as shown in FIG. This molding apparatus includes a pressing jig 15 that is annularly arranged and has a tapered inner diameter, a taper pin 20 that is fitted inside the pressing jig 15, and a metal tube 3.
The outer collet 18 fitted on the outer cover b and the outer collet 18
When the taper pin 20 is slid in a direction perpendicular to the paper surface of FIG. 5, the inner peripheral portion of the pressing jig 15 that is in sliding contact with the tapered outer peripheral surface of the taper pin 20 is formed. The pressing jig 15 is expanded by being pressed in the outer diameter direction, and the inner peripheral surface of the metal tube 3b is pressed by the outer peripheral surface of the pressing jig 15.
【００１５】上記押圧治具１５の外周面には、図６に示
すような凹凸部１６，１７が設けてあり、押圧治具１５
の拡開時にこの凹凸部１６，１７によって金属管３ｂの
内周部は塑性変形を受ける。このとき、金属管３ｂの外
周部１３は外コレット１８によって規制されているた
め、金属管３ｂの内周は、素管時の内周１４を境にして
凹部１１と膨出した凸部１２とを生じることになる。押
圧治具の凹凸部１６，１７の形状としては、連続的また
は断続的な螺旋状の凹凸、あるいは疣状の凹凸を散在さ
せたもの等任意に設定して構わない。螺旋状とすれば、
一般に成形型の製作が容易であるため、型費が安価とな
るメリットがある。On the outer peripheral surface of the pressing jig 15, there are provided uneven portions 16 and 17 as shown in FIG.
The inner peripheral portion of the metal pipe 3b is plastically deformed by the concave-convex portions 16 and 17 at the time of expanding. At this time, since the outer peripheral portion 13 of the metal tube 3b is regulated by the outer collet 18, the inner periphery of the metal tube 3b is divided into the concave portion 11 and the convex portion 12 that bulges with the inner peripheral portion 14 at the time of the raw pipe as a boundary. Will occur. The shape of the concavo-convex portions 16 and 17 of the pressing jig may be arbitrarily set such as continuous or intermittent spiral concavo-convex, or wart-shaped concavo-convex scattered. If it is a spiral,
Generally, since the molding die is easy to manufacture, there is an advantage that the die cost is low.
【００１６】図１０及び図１１に、金属管に設けた凹凸
面の実施例を模式的に示す。図は金属管３ｂを展開して
示したものであり、矢印Ｃの方向が軸方向を、矢印Ｄの
方向が周方向をそれぞれ表しており、斜線部２３及び２
４は例えば押圧により形成された凹部を示している。螺
旋状等の溝状の凹部を形成する場合は、図１０に示すよ
うに周方向に向けて凹部２３を形成すれば、図６に示し
た肉厚Ｔ２なる薄肉部分が存在しても、他の厚肉の凸部
が磁石外周をリング状に取り巻いているため、耐遠心力
強度は大きく、品質上の不安はない。従って、軸方向に
向けて溝状の凹部を形成することは避けねばならない。
また疣状等の凹部を形成する場合は、図１１に示すよう
な凹部２４を設ければよい。10 and 11 schematically show an example of the uneven surface provided on the metal tube. The figure shows the metal tube 3b in an expanded manner, in which the direction of arrow C represents the axial direction and the direction of arrow D represents the circumferential direction.
Reference numeral 4 denotes a recess formed by pressing, for example. In the case of forming a groove-shaped recess such as a spiral, if the recess 23 is formed in the circumferential direction as shown in FIG. 10, even if there is a thin portion having the wall thickness T2 shown in FIG. Since the thick convex portion surrounds the outer circumference of the magnet in a ring shape, the centrifugal strength is large and there is no concern about quality. Therefore, it is necessary to avoid forming a groove-shaped recess in the axial direction.
When forming a wart-shaped recess, a recess 24 as shown in FIG. 11 may be provided.
【００１７】図６及び図１０に示したような金属管３ｂ
の凹凸部は、切削によって設けてもよく、図８にこの構
成を示す。図中符号２５で示される部分が切削による凹
部であり、これにより金属管３ｂには凹部１１と凸部１
２が形成される。切削による場合は、金属管の嵌着前に
限らず、磁石の外周部に金属管を嵌着した後に外径切削
を施すようにしてもよい。また金属管の面上に凹凸を設
ける別の方法として、金属管の素材である板材の段階に
おいて、この板材の面上に押圧等によって凹凸部を設け
るようにしてもよい。A metal tube 3b as shown in FIGS. 6 and 10.
The concavo-convex portion may be provided by cutting, and this configuration is shown in FIG. A portion indicated by reference numeral 25 in the drawing is a concave portion formed by cutting, whereby the concave portion 11 and the convex portion 1 are formed in the metal pipe 3b.
2 is formed. In the case of cutting, the outer diameter cutting may be performed not only before the metal tube is fitted but also after the metal tube is fitted to the outer peripheral portion of the magnet. Further, as another method of providing unevenness on the surface of the metal tube, at the stage of the plate material which is the material of the metal tube, the uneven portion may be provided on the surface of the plate material by pressing or the like.
【００１８】図７は、金属管３ｂの内周面と外周面の両
方に凹凸を設ける場合を示している。この場合は、図５
に示したコレットホルダ１９をスライドさせることによ
って、外コレット１８ａを径方向に拡大及び縮小できる
ように構成しておき、この外コレット１８ａの内周面と
内周側の押圧治具１５の外周面とによって金属管３ｂの
内外周面を同時に押圧するように構成するものである。
外コレット１８ａの内周面には凹凸部２１，２２が、ま
た押圧治具１５の外周面には凹凸部１６，１７がそれぞ
れ対向するように設けてあり、これらの治具の凸部１６
および２２によって押圧を受ける金属管３ｂの内外周面
は、塑性変形して凹部１７および２１へ膨出して逃げ、
肉厚Ｔ３なる薄肉部が形成される。また図６に示した場
合と逆に、金属管の外周面のみに凹凸を設けるようにし
てもよいことは勿論である。FIG. 7 shows a case where unevenness is provided on both the inner peripheral surface and the outer peripheral surface of the metal tube 3b. In this case,
The outer collet 18a is configured to be radially expandable and contractable by sliding the collet holder 19 shown in FIG. 1, and the inner peripheral surface of the outer collet 18a and the outer peripheral surface of the pressing jig 15 on the inner peripheral side. Is used to simultaneously press the inner and outer peripheral surfaces of the metal tube 3b.
Concavo-convex portions 21 and 22 are provided on the inner peripheral surface of the outer collet 18a, and concavo-convex portions 16 and 17 are provided on the outer peripheral surface of the pressing jig 15 so as to face each other.
And the inner and outer peripheral surfaces of the metal pipe 3b that are pressed by 22 plastically deform to bulge into the recesses 17 and 21 and escape.
A thin portion having a wall thickness T3 is formed. Further, it is needless to say that, contrary to the case shown in FIG. 6, the unevenness may be provided only on the outer peripheral surface of the metal tube.
【００１９】図５及び図６に示す要領で、例えば内周面
に凹凸状の成形が施された金属管３ｂには、次に同じ要
領で拡管成形が施される。この様子を図９に示す。図９
に示す拡管装置は、図５に示した成形装置から外コレッ
ト１８及びコレットホルダ１９を取り去り、押圧治具１
５を外周面が滑らかな押圧治具１５ａと取り替えた構成
となっている。成形によって凹凸が形成された金属管３
ｂを押圧治具１５ａの外周部にセットし、成形工程と同
様にして押圧治具１５ａを拡開させると、押圧治具１５
ａの外周面によって金属管３ｂの内周面が押圧されて拡
管される。このようにして金属管３ｂは所望の内径まで
拡管され、磁石２の外径寸法に対して適切なしめしろま
たはすきまを有するように形成される。In the procedure shown in FIGS. 5 and 6, for example, the metal tube 3b whose inner peripheral surface is formed into a concavo-convex shape is then expanded in the same manner. This state is shown in FIG. Figure 9
In the tube expanding device shown in FIG. 5, the outer collet 18 and the collet holder 19 are removed from the molding device shown in FIG.
5 is replaced with a pressing jig 15a having a smooth outer peripheral surface. Metal tube 3 having irregularities formed by molding
b is set on the outer peripheral portion of the pressing jig 15a, and the pressing jig 15a is expanded in the same manner as in the molding step.
The inner peripheral surface of the metal tube 3b is pressed and expanded by the outer peripheral surface of a. In this way, the metal tube 3b is expanded to a desired inner diameter, and is formed to have an appropriate interference or clearance for the outer diameter of the magnet 2.
【００２０】一般に、磁石及び金属板材を丸めて溶接し
た素管は共に仕上がりの寸法精度が悪いために、両者を
嵌合させるためのしめしろまたはすきまが不適切となっ
てしまう傾向にあるが、上記のように金属管に拡管成形
を施すことによって嵌合不良が回避できる。従って、図
４に示す素管３ｂの内径寸法は、最終的に磁石２の外径
へ嵌入される時点の金属管３，３ａの内径寸法と比較し
て小さ目に形成することは勿論である。In general, both the magnet and the metal tube made by rolling and welding the metal plate material have poor finished dimensional accuracy, so that the interference or clearance for fitting the both tends to be inadequate. As described above, the fitting failure can be avoided by expanding the metal tube. Therefore, it is needless to say that the inner diameter dimension of the raw tube 3b shown in FIG. 4 is made smaller than the inner diameter dimension of the metal tubes 3, 3a at the time of finally being fitted into the outer diameter of the magnet 2.
【００２１】上記金属管に凹凸を形成する成形工程と、
金属管を拡開する拡管工程は、同一工程にて行うことも
可能であるが、一般に金属管の面上の凹凸変形が激しい
場合が多いので、成形工程の後に拡管工程を施して径寸
法を整えるようにするのが好ましい。また、金属管の軸
方向端部の面が均一な平面であった方が、折り曲げ部９
の形成が容易であったり、端板４，４ａとのはめあいが
良好であったりするため、金属管の端部近傍には凹凸部
を設けないように構成してもよい。尚、板材を丸めて溶
接して金属管を形成するものにおいては、図４に示した
溶接部１０が図５及び図９に示した押圧治具１５，１５
ａに当接しないようにして成形または拡管を行うことが
好ましい。即ち、溶接部１０は延びにくい状態となって
おり、この部分の押圧を避けることにより、溶接部の品
質上の信頼性を維持するものである。A forming step for forming irregularities on the metal tube,
The pipe expanding process for expanding the metal pipe can be performed in the same process, but in general, the unevenness on the surface of the metal pipe is often severe, so the pipe expanding process is performed after the forming process to reduce the diameter dimension. It is preferable to arrange it. In addition, the bent portion 9 should have a flat surface at the end portion in the axial direction of the metal tube.
Since it is easy to form and the fit with the end plates 4 and 4a is good, the uneven portion may not be provided in the vicinity of the end of the metal tube. In the case where the plate material is rolled and welded to form the metal pipe, the welded portion 10 shown in FIG. 4 has the pressing jigs 15 and 15 shown in FIGS. 5 and 9.
It is preferable to perform molding or tube expansion so as not to contact a. That is, the welded portion 10 is in a state in which it is difficult to extend, and by avoiding the pressing of this portion, the reliability of the quality of the welded portion is maintained.
【００２２】凹凸状の塑性変形部分が設けられ、同時に
所定の内径寸法となるように拡管された金属管３ｂは、
図１乃至図３に示す回転子の金属管３，３ａとして磁石
２の外周部に嵌着される。この回転子は、固定子内に置
かれて電動機として運転されるとき、金属管３，３ａ内
には主に高調波磁束による渦電流が発生する。しかし金
属管に設けた多数の凹凸部によって、特に薄肉厚Ｔ２の
部分で渦電流が流れ難くなり、この結果渦電流のループ
は細分化されることになる。即ち、図６において、金属
管３ｂの各凸部１２の部分に細分化された渦電流のルー
プが生じることになる。一方、肉厚Ｔ２を有する凹部１
１の部分にはループの大きな渦電流が生じるが、成形前
の均一肉厚Ｔ１を有する金属管と比較して、渦電流の絶
対値は格段に小さなものとなる。これらの結果、渦電流
損失が大幅に低減される。The metal pipe 3b provided with an uneven plastically deformed portion and expanded at the same time to have a predetermined inner diameter,
The metal tubes 3 and 3a of the rotor shown in FIGS. 1 to 3 are fitted on the outer peripheral portion of the magnet 2. When the rotor is placed in the stator and operated as an electric motor, an eddy current is generated in the metal tubes 3 and 3a mainly by the harmonic magnetic flux. However, due to the large number of uneven portions provided on the metal tube, it becomes difficult for the eddy current to flow, particularly in the portion of the thin wall thickness T2, and as a result the eddy current loop is subdivided. That is, in FIG. 6, subdivided eddy current loops are generated in the respective convex portions 12 of the metal tube 3b. On the other hand, the concave portion 1 having the wall thickness T2
A large eddy current of the loop is generated in the portion 1 but the absolute value of the eddy current is significantly smaller than that of the metal pipe having the uniform wall thickness T1 before forming. As a result, eddy current loss is significantly reduced.
【００２３】また、図６に示したような押圧成形によっ
て凹凸部を設ける場合、凹部を生じた分凸部側へ膨出す
る部分を備えることになるため、金属管の単位長さ当た
りの断面積は凹凸を形成する前後で変化がなく、従っ
て、切削によって凹凸部を設ける場合と比べて機械的強
度上は有利となる。むしろ金属管が成形によって加工硬
化することから、さらに機械的強度のアップが期待でき
る。Further, when the uneven portion is provided by the press molding as shown in FIG. 6, since the concave portion is provided with a portion which bulges toward the convex portion side, the cutoff per unit length of the metal pipe is provided. The area does not change before and after the unevenness is formed. Therefore, it is advantageous in terms of mechanical strength as compared with the case where the unevenness is formed by cutting. Rather, since the metal tube is work-hardened by molding, further increase in mechanical strength can be expected.
【００２４】発明者らの実験によれば、１馬力クラスの
密閉型圧縮機用の電動機において、Ｔ１＝０．４ｍｍ厚
のＳＵＳ３０４ステンレス管を図５及び図６に示すよう
な成形装置にセットして内周面に凹凸部を設けた場合、
Ｔ２＝０．２ｍｍ以下としたときに顕著な渦電流低減効
果が生じることが確認できた。According to the experiments conducted by the inventors, in an electric motor for a hermetic compressor of a 1-hp class, a SUS304 stainless steel tube having T1 = 0.4 mm was set in a molding apparatus as shown in FIGS. 5 and 6. When unevenness is provided on the inner peripheral surface,
It was confirmed that when T2 = 0.2 mm or less, a remarkable eddy current reduction effect occurs.
【００２５】[0025]
【発明の効果】本発明によれば、磁石の外周部に金属管
を嵌着して構成する回転子において、金属管の強度及び
密閉性を損なうことなく、高調波磁束に起因する金属管
内の渦電流が削減でき、電動機の効率を向上させること
ができる。また金属管の周面に凹凸を設けると同時に拡
管成形を施すため、凹凸を設けた金属管であっても嵌入
に適した内径に仕上げることが可能であり、磁石寸法の
ばらつきにも対応できるものである。According to the present invention, in a rotor constructed by fitting a metal tube to the outer peripheral portion of a magnet, the strength of the metal tube and the hermeticity of the metal tube are not impaired. The eddy current can be reduced and the efficiency of the electric motor can be improved. In addition, since the pipe is expanded and formed at the same time as the metal pipe is provided with irregularities, it is possible to finish even the metal pipe with irregularities to an inner diameter suitable for fitting, and to cope with variations in magnet dimensions. Is.
【００２６】さらに金属管に切れ目がないため、磁石の
密封性は良好であり、密封のための余分な材料を要する
ことなく回転子が製作できる。また金属線を巻回した従
来提案の回転子のように、保護部材の部分的な破損が全
体に及ぶ危険がなく、品質上の信頼性を著しく向上でき
るものである。Further, since the metal tube has no breaks, the magnet has a good sealing property, and the rotor can be manufactured without requiring an extra material for sealing. Further, unlike the conventionally proposed rotor in which a metal wire is wound, there is no risk that the protective member is partially damaged, and the reliability of quality can be significantly improved.
【図１】本発明の実施例を示す回転子の平面断面図。FIG. 1 is a plan sectional view of a rotor showing an embodiment of the present invention.
【図２】本発明の実施例を示す回転子の正面断面図。FIG. 2 is a front sectional view of a rotor showing an embodiment of the present invention.
【図３】本発明の別の実施例を示す回転子の正面断面
図。FIG. 3 is a front sectional view of a rotor showing another embodiment of the present invention.
【図４】金属管を示す斜視図。FIG. 4 is a perspective view showing a metal tube.
【図５】成形装置の一例を示す平面断面図。FIG. 5 is a plan sectional view showing an example of a molding apparatus.
【図６】図５の成形装置をＡ−Ｂ線にて切断、拡大して
示す正面断面図。FIG. 6 is a front cross-sectional view showing the molding apparatus of FIG. 5 by cutting along line AB and enlarging it.
【図７】成形装置の別の一例を示す図６の切断面に相当
する正面断面図。7 is a front cross-sectional view corresponding to a cut surface of FIG. 6 showing another example of the molding apparatus.
【図８】切削による金属管の凹凸部の一例を示す拡大正
面断面図。FIG. 8 is an enlarged front sectional view showing an example of an uneven portion of a metal pipe by cutting.
【図９】拡管装置の一例を示す平面断面図。FIG. 9 is a plan sectional view showing an example of a tube expanding device.
【図１０】凹凸面の実施例を示す金属管の展開図。FIG. 10 is a development view of a metal tube showing an example of an uneven surface.
【図１１】凹凸面の別の実施例を示す金属管の展開図。FIG. 11 is a development view of a metal tube showing another example of the uneven surface.
１ ヨーク ２ 磁石 ３，３ａ，３ｂ 金属管 ４，４ａ 端板 ５ クランプピン ６ 軸孔 １０ 溶接部 １１，２３，２４ 金属管の凹部 １２ 金属管の凸部 1 Yoke 2 Magnet 3,3a, 3b Metal tube 4,4a End plate 5 Clamp pin 6 Shaft hole 10 Welded portion 11,23,24 Metal tube recess 12 Metal tube projection
Claims (8)
石の外周部に金属管を嵌着して構成する磁石回転子にお
いて、前記金属管は、その内外周面の一方または両方に
凹凸部を備えていることを特徴とする磁石回転子。1. A magnet rotor having a magnet mounted on the outer peripheral portion of a yoke and a metal tube fitted on the outer peripheral portion of the magnet, wherein the metal tube has unevenness on one or both of its inner and outer peripheral surfaces. A magnet rotor characterized by comprising a section.
石の外周部に金属管を嵌着して構成する磁石回転子の製
造方法において、前記金属管の嵌着に先立って、前記金
属管の内外周面の一方または両方に凹凸部を設けるとと
もに、その内径が前記磁石の外周部へ嵌入可能な寸法と
なるように拡管成形することを特徴とする磁石回転子の
製造方法。2. A method of manufacturing a magnet rotor, wherein a magnet is mounted on an outer peripheral portion of a yoke, and a metal tube is fitted on the outer peripheral portion of the magnet. A method for manufacturing a magnet rotor, characterized in that a concavo-convex portion is provided on one or both of the inner and outer peripheral surfaces of the tube, and the tube is expanded so that the inner diameter thereof can be fitted into the outer peripheral portion of the magnet.
凹凸部を設けるようにした請求項２記載の磁石回転子の
製造方法。3. The method of manufacturing a magnet rotor according to claim 2, wherein the inner and outer peripheral surfaces of the metal tube are pressed to provide an uneven portion on the surface.
ものにおいて、前記金属管の溶接部は押圧しないように
した請求項３記載の磁石回転子の製造方法。4. The method of manufacturing a magnet rotor according to claim 3, wherein a plate is rolled and welded to form a metal tube, and the welded portion of the metal tube is not pressed.
ものにおいて、予め前記板材の面上に凹凸部を設けるよ
うにした請求項２記載の磁石回転子の製造方法。5. The method of manufacturing a magnet rotor according to claim 2, wherein the plate material is rolled and welded to form a metal tube, and an uneven portion is provided on the surface of the plate material in advance.
凹凸部を設けないようにした請求項２乃至５のいずれか
に記載の磁石回転子の製造方法。6. The method of manufacturing a magnet rotor according to claim 2, wherein the concave and convex portions are not provided in the vicinity of both axial end portions of the metal tube.
石の外周部に金属管を嵌着して構成する磁石回転子の製
造方法において、前記金属管の内外周面の一方または両
方を切削することによって、その面上に凹凸部を設ける
ようにしたことを特徴とする磁石回転子の製造方法。7. A method of manufacturing a magnet rotor in which a magnet is mounted on an outer peripheral portion of a yoke, and a metal tube is fitted on an outer peripheral portion of the magnet, wherein one or both of inner and outer peripheral surfaces of the metal tube is formed. A method of manufacturing a magnet rotor, characterized in that an uneven portion is provided on the surface by cutting.
じる前記金属管の薄肉部の肉厚が、前記凹凸部が形成さ
れる前の肉厚の半分以下となるようにすることを特徴と
する請求項２乃至７のいずれかに記載の磁石回転子の製
造方法。8. The thickness of the thin-walled portion of the metal pipe, which is caused by providing the uneven portion on the metal tube, is half or less than the thickness before the uneven portion is formed. The method for manufacturing a magnet rotor according to any one of claims 2 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6072428A JPH07245921A (en) | 1994-03-04 | 1994-03-04 | Magnet rotor and manufacture thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6072428A JPH07245921A (en) | 1994-03-04 | 1994-03-04 | Magnet rotor and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07245921A true JPH07245921A (en) | 1995-09-19 |
Family
ID=13489019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6072428A Pending JPH07245921A (en) | 1994-03-04 | 1994-03-04 | Magnet rotor and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07245921A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6963151B2 (en) * | 2002-02-04 | 2005-11-08 | Electric Boat Corporation | Composite lamina arrangement for canning of motors |
| JP2007202371A (en) * | 2006-01-30 | 2007-08-09 | Toyota Motor Corp | Rotor, its manufacturing method, rotary electric machine, and internal combustion engine |
| JPWO2022107528A1 (en) * | 2020-11-19 | 2022-05-27 |
-
1994
- 1994-03-04 JP JP6072428A patent/JPH07245921A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6963151B2 (en) * | 2002-02-04 | 2005-11-08 | Electric Boat Corporation | Composite lamina arrangement for canning of motors |
| JP2007202371A (en) * | 2006-01-30 | 2007-08-09 | Toyota Motor Corp | Rotor, its manufacturing method, rotary electric machine, and internal combustion engine |
| JPWO2022107528A1 (en) * | 2020-11-19 | 2022-05-27 | ||
| WO2022107528A1 (en) * | 2020-11-19 | 2022-05-27 | 日本発條株式会社 | Rotor, rotating electric machine, and method of manufacturing rotor |
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