JPH01144345A - Induction motor - Google Patents
Induction motorInfo
- Publication number
- JPH01144345A JPH01144345A JP30067487A JP30067487A JPH01144345A JP H01144345 A JPH01144345 A JP H01144345A JP 30067487 A JP30067487 A JP 30067487A JP 30067487 A JP30067487 A JP 30067487A JP H01144345 A JPH01144345 A JP H01144345A
- Authority
- JP
- Japan
- Prior art keywords
- squirrel
- induction motor
- rotor
- cage
- superconducting material
- 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.)
- Granted
Links
- 230000006698 induction Effects 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 32
- 239000004020 conductor Substances 0.000 claims abstract description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 10
- 229910000831 Steel Inorganic materials 0.000 abstract description 4
- 230000001133 acceleration Effects 0.000 abstract description 4
- 239000010959 steel Substances 0.000 abstract description 4
- 229910001208 Crucible steel Inorganic materials 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 abstract description 2
- 241000555745 Sciuridae Species 0.000 description 25
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 238000005219 brazing Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
Landscapes
- Superconductive Dynamoelectric Machines (AREA)
- Induction Machinery (AREA)
Abstract
Description
【発明の詳細な説明】
〔卒業上の利用分野〕
本発明は誘導電動機にに関し、更に詳述すれば、超電導
材料を使用した新規なかご形回転子を備えた誘導電動機
に関する。DETAILED DESCRIPTION OF THE INVENTION [Graduate field of application] The present invention relates to induction motors, and more particularly to an induction motor with a novel squirrel cage rotor using superconducting materials.
かご形誘導電ａＩ機は、複数の棒状導体それぞれの両端
を相対向する二つの環状導体にて短絡したかご（籠）形
の回転子にそれ自体で閉じた短絡回路を形成させ、これ
を固定子側からの電磁誘導にて回転させ、トルク発生を
行う。A squirrel-cage induction electric machine is a cage-shaped rotor in which both ends of a plurality of rod-shaped conductors are short-circuited by two opposing annular conductors to form a short-circuit that is closed by itself, and this is fixed. It is rotated by electromagnetic induction from the slave side and generates torque.
第４図は上述のような従来の一般的な誘導電動機に用い
られるかご形回転子の構成を示すための回転軸を含む面
での断面図、第５図はその回転方向に沿う部分展開図、
第６図は鉄心の構成を示すための回転軸に直交する方向
の部分断面図である。Fig. 4 is a sectional view taken along the plane including the rotation axis to show the configuration of the squirrel cage rotor used in the conventional general induction motor as described above, and Fig. 5 is a partially exploded view along the direction of rotation. ,
FIG. 6 is a partial cross-sectional view taken in a direction perpendicular to the rotation axis to show the configuration of the iron core.
鉄心１は、電磁鋼板の薄板を多数８１層して、あごいは
鋳鋼等にて円柱状に構成されている。The iron core 1 is made up of 81 layers of thin electromagnetic steel plates, and the jaws are made of cast steel or the like in a cylindrical shape.
この鉄心１はその中心軸がモータ軸６の中心軸と一致す
る状態でモータ軸６に装着され、軸長方向の両開からそ
れぞれクランパ３，３によりモータ軸６に固定されてい
る。This iron core 1 is attached to the motor shaft 6 with its central axis aligned with the central axis of the motor shaft 6, and is fixed to the motor shaft 6 by clampers 3, 3 from both sides in the longitudinal direction of the shaft.
鉄心１の中心軸に沿う方向には第６図にその中心軸と直
交する方向の断面を示す如（、複数のスロット２がプレ
ス打抜きまたは機械加工により鉄心１を貫通する形で形
成されている。In the direction along the central axis of the iron core 1, a plurality of slots 2 are formed through the iron core 1 by press punching or machining (as shown in FIG. .
各スロット２内には、たとえば銅、アルミニュラムある
いはそれらの合金等の金属溝体製のバー４が貫通して挿
入されている。そして、各バー４゜４・・・の両端はそ
れぞれバー４と同様の金属溝体製のエンドリング（環状
導体）５，５を鑞付けまたは溶接により接続して電気的
に短絡することにより、誘導電動機のかご形量転子（二
次回路）が構成されている。A bar 4 made of a metal groove, such as copper, aluminum or an alloy thereof, is inserted through each slot 2 . Then, both ends of each bar 4, 4... are electrically short-circuited by connecting end rings (annular conductors) 5, 5 made of metal grooves similar to those of the bar 4 by brazing or welding. It constitutes the squirrel cage trochanter (secondary circuit) of the induction motor.
このような構成の従来のかご形量転子を用いた誘導電動
機は、そのかご形量転子が抵抗を有するので、第７図に
（１１にてトルク−速度特性を示す如く、負荷トルク（
４）より大きな起動トルクを発生するように諸元を設計
することにより、電圧を印加すると負荷に打ち勝って起
動し、同期速度近傍まで徐々に加速した後、同期速度よ
りわずかに低いすべりを維持して負荷トルクとバランス
した回転を行う。In an induction motor using a conventional squirrel-cage mass rotor having such a configuration, the squirrel-cage mass rotor has resistance, so the load torque (
4) By designing the specifications to generate a larger starting torque, when voltage is applied, the motor overcomes the load and starts, and after gradually accelerating to near the synchronous speed, maintains a slip slightly lower than the synchronous speed. The rotation is balanced with the load torque.
ところで、一般の電動機では起動トルクを大きくするに
は二次抵抗を大きくすればよいことはよく知られている
が、前述したようにかご形量転子を使用する誘導電動機
では、その二次抵抗としてのかご形量転子の抵抗は従来
は可変には出来ない。By the way, it is well known that in order to increase the starting torque of a general electric motor, it is sufficient to increase the secondary resistance, but as mentioned above, in an induction motor that uses a squirrel-cage rotor, the secondary resistance Conventionally, the resistance of the squirrel cage trochanter cannot be varied.
このため、かご形量転子の抵抗を固定したままで大きく
すると、起動完了後の運転時にも大きな二次抵抗に比例
した電気的損失が発生するので、運転効率が大きく低下
するという問題がある。For this reason, if the resistance of the squirrel-cage mass trochanter is fixed and increased, electrical loss proportional to the large secondary resistance will occur even during operation after startup has been completed, resulting in a problem of a significant drop in operating efficiency. .
本°発明は上述のような問題の解決を目的としてなされ
たものであり、起動時には二次抵抗としてのかご形量転
子の抵抗が大きく、起動後の運転時には二次抵抗を小さ
くすることにより高効率の運転を可能とした誘導電動機
の提供を目的とする。The present invention was made with the aim of solving the above-mentioned problems, and the resistance of the squirrel cage rotor as a secondary resistance is large at startup, and the secondary resistance is reduced during operation after startup. The purpose is to provide an induction motor that enables highly efficient operation.
本発明の誘導電動機では、かご形量転子を構成するエン
ドリング及びバーを中空あるいは溝付き形状にしてそれ
らの内部に超電導材料を充填して通常の導体にて構成さ
れるかご形量転子と、超電導材料にて構成されるかご形
量転子との二重のかご形量転子を形成するようにしてい
る。In the induction motor of the present invention, the end rings and bars constituting the squirrel cage mass trochanter are made hollow or grooved, and the insides thereof are filled with a superconducting material, and the squirrel cage mass trochanter is constructed of a normal conductor. and a squirrel cage quantum trochanter made of superconducting material to form a double squirrel cage quantum trochanter.
本発明の誘導電動機では、そのかご形量転子が通常の導
体で構成されたかご形量転子と超電導材料で構成された
かご形量転子との二重構成になるので、超電導材料の臨
界温度以上の雰囲気では従来同様の通常の導体にて構成
されたかご形量転子として、また超電導材料の臨界温度
以下に冷却された場合には低抵抗のかご形量転子になる
。In the induction motor of the present invention, the squirrel cage mass trochanter has a dual structure of a squirrel cage mass trochanter made of a normal conductor and a squirrel cage mass trochanter made of a superconducting material. In an atmosphere above the critical temperature, it functions as a squirrel-cage quantum trochanter made of a conventional conductor, and when cooled below the critical temperature of the superconducting material, it becomes a low-resistance squirrel-cage quantum trochanter.
以下、本発明をその一実施例を示す図面を参照して詳述
する。Hereinafter, the present invention will be described in detail with reference to the drawings showing one embodiment thereof.
第１図は本発明に係る誘導電動機のかご形量転子の構成
を示すための回転軸を含む面での断面図、第２図はその
回転方向に沿う部分展開図、第３図は鉄心の構成を示す
ための回転軸に直交する方向の部分断面図である。なお
、前述の従来技術の説明に用いた第４図〜第６図と同一
または相当部分には同一の参照符号を付与しである。Fig. 1 is a cross-sectional view in a plane including the rotating shaft to show the structure of the squirrel cage quantum rotor of an induction motor according to the present invention, Fig. 2 is a partially exploded view along the direction of rotation, and Fig. 3 is an iron core. FIG. 3 is a partial cross-sectional view taken in a direction perpendicular to the rotation axis to show the configuration of the device. Note that the same reference numerals are given to the same or corresponding parts as in FIGS. 4 to 6 used to explain the prior art described above.
鉄心１は電磁鋼板の薄板を多数８！ｌＪ！シて、あるい
は鋳鋼等にて円柱状に構成されている。Iron core 1 consists of many thin electromagnetic steel plates 8! lJ! It has a cylindrical shape made of steel or cast steel.
この鉄心１はその中心軸がモータ軸６の中心軸と一致す
る状態でモータ軸６に装着され、軸長方向の両側からそ
れぞれクランパ３，３によりモータ軸６に固定されてい
る。This iron core 1 is attached to the motor shaft 6 with its center axis aligned with the center axis of the motor shaft 6, and is fixed to the motor shaft 6 from both sides in the shaft length direction by clampers 3, 3, respectively.
鉄心１の中心軸に沿う方向には第３図にその中心軸と直
交する方向の断面を示す如く、複数のスロソｌ−２がプ
レス打抜きまたは機械加工により鉄心１を貴通する形で
形成されている。In the direction along the central axis of the iron core 1, as shown in the cross section in the direction perpendicular to the central axis in FIG. ing.
各スロット２内には、たとえば銅、アルミニュウムある
いはそれらの合金等の金属溝体製のバー４が貫通して挿
入されている。そして、各バー４゜４・・・の両端はそ
れぞれバー４と同様の金属導体襞のエンドリング（Ｉ！
２状導体）５，５を鑞付けまたは溶接により接続して電
気的に短絡することにより、誘導電動機のかご形量転子
（二次回路）が構成されている。A bar 4 made of a metal groove, such as copper, aluminum or an alloy thereof, is inserted through each slot 2 . Both ends of each bar 4, 4... are end rings (I!) of metal conductor pleats similar to those of bar 4.
A squirrel cage trochanter (secondary circuit) of the induction motor is constructed by electrically shorting the two conductors 5 and 5 by brazing or welding.
以Ｅの構成は従来の一般的な誘導電動機のかご形量転子
と全く同様であるが、本発明の誘導電動機ではそのかご
形量転子が、第３図に示す如く、各バー４が中空形状に
構成されていてその中空部１０にたとえば臨界温度が９
０〜１００Ｋのセラミックス系のＹ−Ｂａ−Ｃｕ−０等
の超電導材料１２が充填されている。The following structure is exactly the same as the squirrel-cage rotor of a conventional general induction motor, but in the induction motor of the present invention, the squirrel-cage rotor has each bar 4 as shown in FIG. It is configured in a hollow shape, and the critical temperature in the hollow part 10 is, for example, 9.
A superconducting material 12 such as ceramic Y-Ba-Cu-0 having a temperature of 0 to 100K is filled.
また両エンドリング５，５にはその対向面、即ち各バー
４．４が取付けられている面に溝１１が設けら゛れてお
り、この溝１１内には上述のバー４の中空部１０に充填
されているのと同様の超電導材料１２が充填されている
。そして、各バー４の中空部１０に充填されている超電
導材料１２と両エンドリング５，５の溝１１に充填され
ている超電導材料１２とは第１図及び第２図に示されて
いる如く電気的に接続されている。Further, both end rings 5, 5 are provided with a groove 11 on their opposing surfaces, that is, on the surface where each bar 4.4 is attached, and within this groove 11 there is provided a hollow portion 10 of the above-mentioned bar 4. A superconducting material 12 similar to that filled in is filled. The superconducting material 12 filled in the hollow portion 10 of each bar 4 and the superconducting material 12 filled in the grooves 11 of both end rings 5, 5 are as shown in FIGS. 1 and 2. electrically connected.
なお、このような構成の本発明の誘導電動機のかご形回
転子の実際の製造は、各バー４及びエンドリング５それ
ぞれの中空部１０及び溝１１に超電導材料１２を充填し
た後に焼成し、それぞれをそれぞれの超電導材料同士が
電気的に接続するように、溶接または鑞付けにて円筒籠
形に組み立てることにより行われる。そして、このよう
な構成を採ることにより、本発明の誘導電動機用かご形
回転子は通常の導体にて構成されるかご形回転子と、超
電導材料１２にて構成されるかご形回転子との言わば二
重構造に形成されることになる。The actual production of the squirrel cage rotor of the induction motor of the present invention having such a configuration is to fill the hollow portions 10 and grooves 11 of each bar 4 and end ring 5 with superconducting material 12, and then to sinter the superconducting material 12. This is done by assembling the superconducting materials into a cylindrical cage shape by welding or brazing so that the superconducting materials are electrically connected to each other. By adopting such a configuration, the squirrel-cage rotor for an induction motor of the present invention has a squirrel-cage rotor made of a normal conductor and a squirrel-cage rotor made of a superconducting material 12. In other words, it is formed into a double structure.
以上のように構成されたかご形回転子を備えた本発明の
誘導電動機は以下のように動作する。The induction motor of the present invention equipped with the squirrel cage rotor configured as described above operates as follows.
まず、本発明の誘導電動機は室温、より具体的には超電
導材料１２の臨界温度以上の雰囲気下で起動される。こ
の際、Ｍｉ電導材料１２は超電導状態にはな（、かご彩
画転子全体としての二次抵抗はバー４及びエンドリング
５を構成する金属導体の抵抗にて決定される値を示す。First, the induction motor of the present invention is started at room temperature, more specifically in an atmosphere above the critical temperature of the superconducting material 12. At this time, the Mi conductive material 12 is not in a superconducting state (the secondary resistance of the entire cage trochanter shows a value determined by the resistance of the metal conductor constituting the bar 4 and the end ring 5.
従って、この状態で本発明の誘導電動機の固定子に電圧
を印加すると、本発明の誘導電動機用かご形回転子は通
常の高抵抗かご形回転子あるいは深溝形回転子として作
用するので、第７図にｆｌ）にて示す従来同様のトルク
−速度特性を示す。Therefore, when voltage is applied to the stator of the induction motor of the present invention in this state, the squirrel cage rotor for the induction motor of the present invention acts as a normal high resistance squirrel cage rotor or deep groove rotor. The torque-speed characteristic similar to the conventional one is shown in the figure fl).
これに対し、起動後の加速完了時に回転子をたとえば液
体窒素等の冷媒を使用して徐々に冷却すればバー４及び
エンドリング５を構成する金属導体の抵抗が徐々に低下
するので、第７図に（２）にて示すトルク−速度特性を
示して加速する。On the other hand, if the rotor is gradually cooled down using a refrigerant such as liquid nitrogen when acceleration is completed after startup, the resistance of the metal conductors forming the bars 4 and end rings 5 will gradually decrease. It accelerates with the torque-speed characteristic shown in (2) in the figure.
そして更に、超電導材料１２の臨界温度以下にまでかご
形回転子の冷却が進むと、超電導材料１２は超電導状態
になるのでその抵抗は０になり、かご形回転子のトルク
−速度特性は第７図に（３）に示す如くになる。このよ
うに、かご形回転子を超電導材料１２の臨界温度以下に
冷却すれば、回転子電流は超電導材料１２にて構成され
る閉回路を流れることになるので、回転子損失が極めて
少なくなる。Furthermore, as the squirrel cage rotor cools down to a temperature below the critical temperature of the superconducting material 12, the superconducting material 12 enters a superconducting state, so its resistance becomes 0, and the torque-speed characteristic of the squirrel cage rotor becomes the seventh The result is as shown in (3) in the figure. In this way, if the squirrel-cage rotor is cooled to below the critical temperature of the superconducting material 12, the rotor current will flow through the closed circuit made of the superconducting material 12, and thus the rotor loss will be extremely reduced.
なお、上記実施例ではバー４は中空の棒状導体にて構成
しているが、エンドリング５同様に溝を形成してこの溝
に超電導材料１２を充填する構成でもよい。また、バー
４及びエンドリング５の中空部１０及び溝１１はそれぞ
れ複数組を設けるようにしてもよい。In the above embodiment, the bar 4 is made of a hollow rod-shaped conductor, but it may also be configured to form a groove and fill the superconducting material 12 in the same manner as the end ring 5. Further, a plurality of sets of hollow portions 10 and grooves 11 of the bar 4 and end ring 5 may be provided.
以上に詳述したように本発明の誘導電動機によれば、室
温雰囲気下で起動することにより起動特性が良好な通常
のかご形誘導電動機としての起動が可能であり、また起
動後の加速完了時には超電導材料の臨界温度以下に冷却
することにより二次抵抗をほぼ零にして回転子ｆｊｌ失
が極めて小さい高効率の誘導電動機としての運転が可能
になる。As detailed above, according to the induction motor of the present invention, it is possible to start it as a normal squirrel cage induction motor with good starting characteristics by starting it in a room temperature atmosphere, and when the acceleration is completed after starting. By cooling the superconducting material below its critical temperature, the secondary resistance is reduced to almost zero, allowing operation as a highly efficient induction motor with extremely small rotor fjl loss.
また、超電導材料を通常の金属導体にて覆うように構成
しているので、比較的脆い超電導材料を使用するような
場合にもその欠損、破壊等を防止することが可能である
。Furthermore, since the superconducting material is covered with a normal metal conductor, even when using a relatively brittle superconducting material, it is possible to prevent the chipping, destruction, etc. of the superconducting material.
“第１図は本発明の誘導電動機に備えられたかご形回転
子の回転軸を含む面での断面図、第２図はその回転方向
に沿う部分展開図、第３図は回転軸に直交する方向の部
分断面図、第４図は従来Ｑ誘導電動機に備えられたかご
形回転子の回転軸を含む面での断面図、第５図はその回
転方向に沿う部分展開図、第６図は回転軸に直交する方
向の部分断面図、第７図は本発明の誘導電動機用かご形
回転子を使用した誘導電動機及び従来のかご形誘導電動
機のトルク−速度特性のグラフである。
４・・・バー ５・・・エンドリング １０・・・
中空部１１・・・溝 １２・・・超電導材料なお、各
図中同一符号は同−又は相当部分を示す。“Figure 1 is a cross-sectional view of the squirrel cage rotor included in the induction motor of the present invention in a plane including the rotation axis, Figure 2 is a partial exploded view along the rotation direction, and Figure 3 is orthogonal to the rotation axis. FIG. 4 is a cross-sectional view of a squirrel cage rotor provided in a conventional Q induction motor in a plane including the rotating shaft, FIG. 5 is a partially exploded view along the rotating direction, and FIG. 6 is a partial sectional view taken in a direction perpendicular to the rotation axis, and FIG. 7 is a graph of torque-speed characteristics of an induction motor using the squirrel cage rotor for an induction motor of the present invention and a conventional squirrel cage induction motor. 4. ...Bar 5...End ring 10...
Hollow portion 11...Groove 12...Superconducting material Note that the same reference numerals in each figure indicate the same or corresponding parts.
Claims (1)
環状導体にて短絡したかご形回転子を備えた誘導電動機
において、 前記かご形回転子は、前記棒状導体及び環 状導体を中空形状または溝付き形状に形成し、それぞれ
の中空部または溝部に超電導材料を充填し、各棒状導体
に充填された超電導材料と両環状導体に充填された超電
導材料とを電気的に接続してなることを特徴とする誘導
電動機。[Claims] 1. In an induction motor equipped with a squirrel-cage rotor in which both ends of each of a plurality of rod-shaped conductors are short-circuited by two annular conductors facing each other, the squirrel-cage rotor is connected to the rod-shaped conductor and the annular conductor. Conductors are formed into hollow or grooved shapes, each hollow or groove is filled with superconducting material, and the superconducting material filled in each rod-shaped conductor and the superconducting material filled in both annular conductors are electrically connected. An induction motor characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62300674A JPH0736686B2 (en) | 1987-11-27 | 1987-11-27 | Induction motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62300674A JPH0736686B2 (en) | 1987-11-27 | 1987-11-27 | Induction motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01144345A true JPH01144345A (en) | 1989-06-06 |
| JPH0736686B2 JPH0736686B2 (en) | 1995-04-19 |
Family
ID=17887707
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62300674A Expired - Lifetime JPH0736686B2 (en) | 1987-11-27 | 1987-11-27 | Induction motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0736686B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01255451A (en) * | 1988-04-04 | 1989-10-12 | Canon Inc | Coreless motor and lead |
| JP2006213393A (en) * | 2005-02-07 | 2006-08-17 | Kyodo Printing Co Ltd | Packaging bag |
| US7887894B2 (en) | 2005-02-07 | 2011-02-15 | Kyodo Printing Co., Ltd. | Packaging bag and drying agent with moisture absorption indicator function |
| JP2013055733A (en) * | 2011-09-01 | 2013-03-21 | Kyoto Univ | Operation method of superconductive rotating machine and superconductive rotating machine system |
| CN110114965A (en) * | 2017-06-16 | 2019-08-09 | 株式会社东芝 | The rotor of induction conductivity |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01117641A (en) * | 1987-10-30 | 1989-05-10 | Hitachi Ltd | Fan motor |
-
1987
- 1987-11-27 JP JP62300674A patent/JPH0736686B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01117641A (en) * | 1987-10-30 | 1989-05-10 | Hitachi Ltd | Fan motor |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01255451A (en) * | 1988-04-04 | 1989-10-12 | Canon Inc | Coreless motor and lead |
| JP2006213393A (en) * | 2005-02-07 | 2006-08-17 | Kyodo Printing Co Ltd | Packaging bag |
| US7887894B2 (en) | 2005-02-07 | 2011-02-15 | Kyodo Printing Co., Ltd. | Packaging bag and drying agent with moisture absorption indicator function |
| US8268421B2 (en) | 2005-02-07 | 2012-09-18 | Kyodo Printing Co., Ltd. | Packaging bag and drying agent with moisture absorption indicator function |
| JP2013055733A (en) * | 2011-09-01 | 2013-03-21 | Kyoto Univ | Operation method of superconductive rotating machine and superconductive rotating machine system |
| CN110114965A (en) * | 2017-06-16 | 2019-08-09 | 株式会社东芝 | The rotor of induction conductivity |
| CN110114965B (en) * | 2017-06-16 | 2021-03-09 | 株式会社东芝 | Rotor of induction motor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0736686B2 (en) | 1995-04-19 |
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