JPH0721081Y2 - Canned motor rotor - Google Patents
Canned motor rotorInfo
- Publication number
- JPH0721081Y2 JPH0721081Y2 JP1987101610U JP10161087U JPH0721081Y2 JP H0721081 Y2 JPH0721081 Y2 JP H0721081Y2 JP 1987101610 U JP1987101610 U JP 1987101610U JP 10161087 U JP10161087 U JP 10161087U JP H0721081 Y2 JPH0721081 Y2 JP H0721081Y2
- Authority
- JP
- Japan
- Prior art keywords
- rotor
- thin
- chamber
- main shaft
- rotor core
- 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.)
- Expired - Lifetime
Links
- 239000011261 inert gas Substances 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 239000004020 conductor Substances 0.000 description 10
- 229910052782 aluminium Inorganic materials 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 229910052742 iron Inorganic materials 0.000 description 7
- 239000000470 constituent Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 229910000976 Electrical steel Inorganic materials 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 241000499489 Castor canadensis Species 0.000 description 1
- 235000011779 Menyanthes trifoliata Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Landscapes
- Motor Or Generator Frames (AREA)
- Manufacture Of Motors, Generators (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、キャンドモータの回転子に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a rotor of a canned motor.
従来、キャンドモータの回転子は空気中で加熱除湿した
状態で回転子鉄心が嵌挿された薄肉円筒即ちキャン両端
と回転子側板とを溶接する共に、更に回転子側板と回転
子主軸とを溶接して回転子室を形成し、該回転子室にロ
ータ鉄心及び２次導体を密閉する構造であった。Conventionally, the rotor of a canned motor is welded to the rotor side plate and the rotor side plate while the thin-walled cylinder in which the rotor core is inserted, that is, both ends of the can and the rotor side plate are welded while being heated and dehumidified in air. Then, the rotor chamber is formed, and the rotor core and the secondary conductor are sealed in the rotor chamber.
しかしながら上記従来構造のキャンドモータの回転子に
おいては、回転子室に密封された空気には酸素が含まれ
ており、この酸素が回転子鉄心の構成材料である珪素鋼
板及び２次導体の構成材料であるアルミニウム（又は
銅）と反応し酸化及び腐食するという問題がある。However, in the above-described conventional canned motor rotor, the air sealed in the rotor chamber contains oxygen, and this oxygen is the constituent material of the rotor core, the silicon steel plate and the constituent material of the secondary conductor. However, there is a problem in that it reacts with aluminum (or copper), which causes the oxidation and corrosion.
また、この酸化及び腐食のため、回転子室内に鉄錆がで
き、この鉄錆の固まりがモータの運転、停止の都度キャ
ンをたたきキャンの寿命を短縮させたり、腐食部がキャ
ンを内側から押し上げキャンを膨張させ、キャンが固定
子側に接触し回転子を拘束し、ひいてはモータ焼損を招
くという問題があった。In addition, due to this oxidation and corrosion, iron rust is generated in the rotor chamber.The iron rust mass hits the can every time the motor is operated or stopped, and the corrosive part pushes up the can from the inside. There has been a problem that the can expands, the can comes into contact with the stator side, restrains the rotor, and eventually causes motor burnout.
また、酸化及び腐食により水素ガスが発生する場合は、
回転子内の圧力が上昇し、モータ運転による回転子加熱
と相まって、回転子室内のガス膨張によりキャンが膨張
し、固定子と回転子が接触して回転子を拘束、ひいては
モータ焼損を招くという問題もあった。If hydrogen gas is generated due to oxidation and corrosion,
The pressure inside the rotor rises, and the can expands due to the gas expansion in the rotor chamber combined with the heating of the rotor by the motor operation, and the stator and rotor come into contact with each other to restrain the rotor and eventually burn the motor. There was also a problem.
本考案は上述の点に鑑みてなされたもので、上記問題点
を除去し、回転子室内で珪素鋼板及びアルミニウム（又
は銅）等の腐食がなく、キャン寿命が長く且つ回転子と
固定子の接触や回転子の拘束によるモータ損傷のないキ
ャンドモータの回転子を提供することにある。The present invention has been made in view of the above-mentioned problems, and eliminates the above-mentioned problems, does not corrode silicon steel plate and aluminum (or copper), etc. in a rotor chamber, has a long can life, and has a long rotor and stator. An object of the present invention is to provide a rotor of a canned motor that does not damage the motor due to contact or restraint of the rotor.
上記問題点を解決するため本考案は、キャンドモータの
回転子を内径が回転子鉄心の外周に略等しい１個の薄肉
円筒と、外径が回転子鉄心の外径と略等しく且つ中央部
に回転子主軸が貫通する貫通穴が形成され更に同心円状
の波形が形成された２枚の薄肉側板とを具備し、該薄肉
円筒を回転子鉄心の外周に嵌挿すると共に前記２枚の薄
肉側板をその貫通穴に回転子主軸を通して薄肉円筒の両
端部に当接し、該当接部を溶接して該薄肉円筒と２枚の
薄肉側板を一体にすると共に回転子主軸の外周と薄肉側
板の貫通穴との当接部を溶接して回転子鉄心を密封する
回転子室を形成し、該回転子室に不活性ガス又は乾燥空
気を封入したことを特徴とする。In order to solve the above problems, the present invention provides a rotor of a canned motor with a thin cylinder having an inner diameter substantially equal to the outer circumference of the rotor core, and an outer diameter substantially equal to the outer diameter of the rotor core and at a central portion. A thin-walled side plate having a through-hole through which the rotor main shaft penetrates and further having a concentric circular corrugation formed therein. The thin-walled cylinder is fitted into the outer periphery of the rotor core, and the two thin-sided plates are provided. Through the main shaft of the rotor through the rotor spindle and contact both ends of the thin-walled cylinder, and welding the contacting portions to integrate the thin-walled cylinder and the two thin-walled side plates and through holes of the outer circumference of the rotor spindle and the thin-walled side plate. A rotor chamber for sealing the rotor core is formed by welding the abutting part of the rotor and the rotor core, and inert gas or dry air is enclosed in the rotor chamber.
また、前記回転子室内を減圧したことを特徴とする。Further, the inside of the rotor chamber is decompressed.
キャンドモータの回転子を上記の如く構成することによ
り、回転子室内に不活性ガス又は乾燥空気が封入されて
いるため、回転子鉄心の構成材料である珪素鋼板及び２
次導体の構成材料であるアルミニウム（又は銅）酸化及
び腐食するという問題がなくなる。従って、従来のよう
に回転子室内に鉄錆の固まりができ、モータの運転、停
止の都度キャンをたたいてキャンの寿命を短縮させた
り、腐食部がキャンを内側から押し上げキャンを膨張さ
せ、キャンが固定子側に接触し回転子を拘束させ、ひい
てはモータ焼損を招くとい問題がなくなる。また、回転
子室に不活性ガス又は乾燥空気を封入しているから、従
来のように水分がある場合、該水分と回転子鉄心の鉄及
び２次導体のアルミニウムとが反応して水素が発生し、
回転子室内の圧力が上昇し、モータ運転による回転子加
熱と相まって、回転子室内のガス膨張によりキャンが膨
張し、固定子と接触し回転子を拘束させ、モータ焼損を
招くという問題がなくなる。By constructing the rotor of the canned motor as described above, since the inert gas or the dry air is enclosed in the rotor chamber, the silicon steel plate and 2 which are the constituent materials of the rotor core are provided.
The problem of oxidation and corrosion of aluminum (or copper), which is the constituent material of the secondary conductor, is eliminated. Therefore, iron rust can be formed in the rotor chamber as in the past, and the life of the can is shortened by hitting the can each time the motor is operated or stopped, or the corroded portion pushes the can from the inside to expand the can. There is no problem that the can comes into contact with the stator side and restrains the rotor, which in turn causes motor burnout. Further, since the rotor chamber is filled with inert gas or dry air, when there is water as in the conventional case, the water reacts with the iron of the rotor core and the aluminum of the secondary conductor to generate hydrogen. Then
There is no problem that the pressure in the rotor chamber rises, the heating of the rotor causes the motor to operate, and the can expands due to the gas expansion in the rotor chamber, comes into contact with the stator and restrains the rotor, and causes motor burnout.
また、側板に同心円状の波形が形成された薄肉板を用い
るので、回転子室内の圧力が若干上昇しても、この薄肉
側板が軸方向に撓み、キャンの外側への膨張力を吸収す
るため、固定子と回転子が接触して回転子を拘束するこ
とがない。Also, since a thin plate with concentric corrugations is used for the side plates, even if the pressure inside the rotor chamber rises slightly, the thin side plates flex in the axial direction and absorb the expansion force to the outside of the can. , The stator and the rotor do not come into contact with each other to restrain the rotor.
以下、本考案の一実施例を図面に基づいて説明する。 An embodiment of the present invention will be described below with reference to the drawings.
第１図は本考案に係るキャンドモータの回転子の構造を
示す断面図、第２図はその一部拡大図である。FIG. 1 is a sectional view showing the structure of a canned motor rotor according to the present invention, and FIG. 2 is a partially enlarged view thereof.
図において、11は薄肉円筒即ちキャンであり、該キャン
11はその内径が回転子鉄心13の外周に略等しく、ステン
レス鋼等の薄肉の非磁性体金属でできている。12は側板
であり、該側板12は同心円状の波形が形成された円板で
あり、該側板12の外径は回転子鉄心13の外径と略等しく
且つ中央部に回転子主軸15が貫通する穴が形成されてい
る。キャン11を回転子鉄心13の外周に嵌挿すると共に側
板12を回転子主軸15が中央部の穴を貫通させて回転子鉄
心13の側部に当接させる。この状態でキャン11の両端部
と側板12の外周の当接部に溶接部16を形成して溶接する
と共に回転子主軸15と側板12との当接部に溶接部17を形
成して溶接し、回転子鉄心13と２次導体14からなる回転
子を密封する回転子室18を形成する。該回転子室18に、
例えばヘリウム、アルゴン等の不活性ガスや乾燥空気を
封入する。In the figure, 11 is a thin-walled cylinder or can.
The inner diameter of 11 is substantially equal to the outer circumference of the rotor core 13, and is made of a thin non-magnetic metal such as stainless steel. Reference numeral 12 denotes a side plate, the side plate 12 is a circular plate on which concentric corrugations are formed, the outer diameter of the side plate 12 is substantially equal to the outer diameter of the rotor core 13, and the rotor main shaft 15 penetrates through the central portion. A hole is formed. The can (11) is fitted around the rotor core (13) and the side plate (12) is brought into contact with the side part of the rotor core (13) with the rotor main shaft (15) penetrating through the central hole. In this state, welded portions 16 are formed at both end portions of the can 11 and the outer peripheral contact portion of the side plate 12 for welding, and welded portions 17 are formed at the contact portion between the rotor main shaft 15 and the side plate 12 for welding. A rotor chamber 18 for sealing the rotor, which is composed of the rotor core 13 and the secondary conductor 14, is formed. In the rotor chamber 18,
For example, an inert gas such as helium or argon or dry air is enclosed.
上記構造の回転子を、例えば真空ポンプ駆動用キャンド
モータに使用した場合、即ち回転子が真空又は減圧状態
にさらされる場合は、空気又は真空ポンプ系のガスによ
る熱の伝導（対流等による）が少ないためロータ温度は
高温（150〜250°Ｃ）となる。このため回転子室18内の
不活性ガスＧはボイルシャルルの法則に従って膨張し、
キャン11を内側から膨張させることになる。また、回転
子室18内に水分があった場合は、珪素鋼板の鉄と２次導
体14のアルミニウムが次の反応で腐食し、水素ガスを生
成する。When the rotor having the above structure is used in, for example, a canned motor for driving a vacuum pump, that is, when the rotor is exposed to a vacuum or a reduced pressure state, heat conduction (by convection etc.) due to air or gas in the vacuum pump system is caused. Since the amount is small, the rotor temperature becomes high (150 to 250 ° C). Therefore, the inert gas G in the rotor chamber 18 expands according to Boyle-Charles' law,
The can 11 will be inflated from the inside. Further, when there is water in the rotor chamber 18, the iron of the silicon steel plate and the aluminum of the secondary conductor 14 are corroded in the next reaction to generate hydrogen gas.
鉄 Fe＋2H2O＝Fe(OH)2＋Ｈ２↑ アルミニウム 2Al＋6H2O＝2Al(OH)3＋3H2↑ この水素ガスは回転子室18内に当初密封された不活性ガ
ス又は乾燥空気にプラスされた状態となり、回転子室18
内の圧力が上昇する。Iron Fe + 2H 2 O = Fe (OH) 2 + H 2 ↑ Aluminum 2Al + 6H 2 O = 2Al (OH) 3 + 3H 2 ↑ This hydrogen gas was added to the inert gas or dry air initially sealed in the rotor chamber 18. State, rotor chamber 18
The pressure inside rises.
また、水分はモータ運転に伴い回転子が温度上昇し、水
のベーバー温度を越えるためベーバーして約1700倍の体
積となるため一気に回転子室18内の圧力を高め、キャン
11を膨張させることになる。In addition, the temperature of the rotor increases with the operation of the motor, and since the temperature of the rotor exceeds the Beaver temperature of water, the water will be vaporized and the volume will increase to about 1700 times.
11 will be inflated.
上記問題を解決する手段として、本実施例では水分の回
転子室18内への混入を防止するため、キャン11の両端と
側板12及び側板12と回転子主軸15の密閉溶接時を回転子
の除湿及び加熱乾燥（通常100〜150°Ｃ）直後とすると
共に、ヘリウム、アルゴン等の不活性ガス又は乾燥空気
を密封することにより防止した。また、この場合モータ
の運転状態における回転子温度に近いか又はそれより高
い温度で密封すると回転子室18内は減圧状態となり回転
子室18の内圧上昇を抑制することができる。As means for solving the above problem, in this embodiment, in order to prevent water from being mixed into the rotor chamber 18, both ends of the can 11, the side plates 12, and the side plate 12 and the rotor main shaft 15 are hermetically welded to the rotor. Immediately after dehumidification and heat drying (usually 100 to 150 ° C.), it was prevented by sealing an inert gas such as helium or argon or dry air. Further, in this case, if the temperature is sealed at a temperature close to or higher than the rotor temperature in the operating state of the motor, the inside of the rotor chamber 18 will be in a depressurized state and an increase in the internal pressure of the rotor chamber 18 can be suppressed.
なお、上記構造の回転子において、回転子室18の空間容
積を極力小さくするためには、側板12の形状を第２図に
示すように２次導体14に当接する部分を平坦で、２次導
体14の側面に密接する形状とし、更に側板12の２次導体
14と回転子主軸15の間隙部分に位置する部分を回転子鉄
心13側に屈曲させた形状にすることにより、回転子室18
の空間容積を極力小さくすることができる。In the rotor having the above structure, in order to reduce the space volume of the rotor chamber 18 as much as possible, the shape of the side plate 12 is flat as shown in FIG. The secondary conductor of the side plate 12 has a shape that closely contacts the side surface of the conductor 14.
By making the portion located in the gap between the rotor 14 and the rotor main shaft 15 bent toward the rotor core 13 side, the rotor chamber 18
The space volume of can be minimized.
以上説明したように本考案によれば、下記のような優れ
た効果がある。As described above, the present invention has the following excellent effects.
回転子室に不活性ガスを封入することにより、回転子
鉄心の構成材料である珪素鋼板及び２次導体の構成材料
であるアルミニウム（又は銅）が酸化及び腐食すること
がなくなる。By filling the rotor chamber with the inert gas, the silicon steel plate which is the constituent material of the rotor core and the aluminum (or copper) which is the constituent material of the secondary conductor are prevented from being oxidized and corroded.
また、回転子室内に鉄錆の固まりができ、モータの運
転、停止の都度キャンをたたいてキャンの寿命を短縮さ
せたりすることがなく、キャンの寿命がながくなる。Further, iron rust is formed in the rotor chamber, and the life of the can is reduced without hitting the can each time the motor is operated or stopped, thereby reducing the life of the can.
腐食がないから腐食部がキャンを内側から押し上げた
り、水素発生により回転子室内の圧力が上昇したりし
て、キャンが固定子側に接触し回転子を拘束させ、ひい
てはモータ焼損を招くという問題がなくなる。Since there is no corrosion, the corroded part pushes up the can from the inside or the pressure in the rotor chamber rises due to hydrogen generation, the can comes into contact with the stator side and restrains the rotor, eventually causing motor burnout. Disappears.
側板に同心円状の波形が形成された薄肉板を用いるの
で、回転子室内の圧力が若干上昇しても、この薄肉側板
が軸方向に撓み、キャンの外周側（半径方向）への膨張
力を吸収するため、固定子と回転子が接触して回転子を
拘束することがない。Since a thin plate with concentric corrugations is used for the side plates, even if the pressure inside the rotor chamber rises slightly, this thin side plate flexes in the axial direction and the expansion force to the outer peripheral side (radial direction) of the can is increased. Since it absorbs, the stator and the rotor do not come into contact with each other to restrain the rotor.
第１図は本考案に係るキャンドモータの回転子の構造を
示す断面図、第２図はその一部拡大図である。 図中、11……キャン、12……側板、13……回転子鉄心、
14……２次導体、15……回転子主軸、16,17……溶接
部、18……回転子室。FIG. 1 is a sectional view showing the structure of a canned motor rotor according to the present invention, and FIG. 2 is a partially enlarged view thereof. In the figure, 11 …… can, 12 …… side plate, 13 …… rotor core,
14 …… Secondary conductor, 15 …… Rotor main shaft, 16,17 …… Welded part, 18 …… Rotor chamber.
Claims (2)
薄肉円筒と、外径が回転子鉄心の外径と略等しく且つ中
央部に回転子主軸が貫通する貫通穴が形成され更に同心
円状の波形が形成された２枚の薄肉側板とを具備し、 前記薄肉円筒を回転子鉄心の外周に嵌挿すると共に前記
２枚の薄肉側板をその貫通穴に回転子主軸を通して前記
薄肉円筒の両端部に当接し、該当接部を溶接して該薄肉
円筒と２枚の薄肉側板を一体にすると共に前記回転子主
軸の外周と前記薄肉側板の貫通穴との当接部を溶接して
前記回転子鉄心を密封する回転子室を形成し、該回転子
室に不活性ガス又は乾燥空気を封入したことを特徴とす
るキャンドモータの回転子。1. A thin-walled cylinder having an inner diameter substantially equal to the outer circumference of a rotor core, and an outer diameter substantially equal to the outer diameter of the rotor core, and a through hole through which a rotor main shaft penetrates is formed in a central portion. Two thin side plates having concentric corrugations formed therein, wherein the thin cylinder is fitted around the outer periphery of a rotor core, and the two thin side plates are passed through the rotor main shaft through the rotor main shaft to form the thin cylinder. Abutting against both ends of the thin-walled cylinder and the two thin-sided plates by welding the corresponding contacting parts, and welding the abutting part between the outer periphery of the rotor spindle and the through-hole of the thin-sided plate. A rotor for a canned motor, characterized in that a rotor chamber for sealing the rotor core is formed, and an inert gas or dry air is enclosed in the rotor chamber.
る実用新案登録請求の範囲第（１）項記載のキャンドモ
ータの回転子。2. A rotor for a canned motor according to claim 1, wherein the inside of the rotor chamber is decompressed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987101610U JPH0721081Y2 (en) | 1987-06-30 | 1987-06-30 | Canned motor rotor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987101610U JPH0721081Y2 (en) | 1987-06-30 | 1987-06-30 | Canned motor rotor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS646759U JPS646759U (en) | 1989-01-13 |
| JPH0721081Y2 true JPH0721081Y2 (en) | 1995-05-15 |
Family
ID=31330762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987101610U Expired - Lifetime JPH0721081Y2 (en) | 1987-06-30 | 1987-06-30 | Canned motor rotor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0721081Y2 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5540680U (en) * | 1978-09-09 | 1980-03-15 | ||
| JPS5540679U (en) * | 1978-09-09 | 1980-03-15 | ||
| JPS5950740A (en) * | 1982-09-16 | 1984-03-23 | Mitsubishi Electric Corp | Stator for canned motor |
| JPS58192449A (en) * | 1982-04-30 | 1983-11-09 | Mitsubishi Electric Corp | Stator for canned motor |
-
1987
- 1987-06-30 JP JP1987101610U patent/JPH0721081Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS646759U (en) | 1989-01-13 |
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