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특허 상세정보

Motor and pressure generating apparatus incorporating the motor

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) F04D-019/04   
미국특허분류(USC) 310/090.5
출원번호 US-0288120 (2002-11-05)
발명자 / 주소
출원인 / 주소
대리인 / 주소
    Crompton, Seager & Tufte, LLC
인용정보 피인용 횟수 : 10  인용 특허 : 14
초록

A compact turbo-molecular pump having a high depressurizing capability. A motor driving the pump includes a rotary shaft, the distal and basal ends of which are supported by magnetic bearings. Each magnetic bearing has a rotated magnet, which is rotated integrally with the rotary shaft, and a fixed magnet, which is opposed to the rotated magnet. The rotated and fixed magnets repel each other. The diameter of the magnetic bearing at the distal end of the rotary shaft is greater than that of the magnetic bearing at the basal end. This decreases movement of...

대표
청구항

1. A motor comprising:a rotary shaft, wherein an axial urging force is applied to the rotary shaft in a first direction when the motor is driven;a first magnetic bearing for supporting the rotary shaft; anda second magnetic bearing for supporting the rotary shaft, wherein the first and second magnetic bearings each include two magnets that repel each other, and wherein a resultant force of the repulsion of the first magnetic bearing and the repulsion of the second magnetic bearing acts in a direction opposite to the first direction. 2. A vacuum pump prov...

이 특허에 인용된 특허 (14)

  1. Liegat Siegfried (Bruchsal DEX). Apparatus for thrust compensation on shaft of rotary pump. USP1997035613831.
  2. Bohlin Leif,SEX. Bearing device. USP2001046218751.
  3. Tecza Joseph A. (Schenectady NY) Rao Dantam K. (Niskayuna NY). Damping for passive magnetic bearings. USP1996055521448.
  4. Post Richard F. (Walnut Creek CA). Dynamically stable magnetic suspension/bearing system. USP1996025495221.
  5. Forster Helmut (Neunkirchen DEX) Hini Paul (Kosbach DEX) Stransky Gerd (Alzenau DEX). Magnetic suspension bearing. USP1982074340260.
  6. Ritts Gary (19252 Harliss St. Northridge CA 91324). Magnetically balanced spinning apparatus. USP1996045506459.
  7. Hirokazu Yashiro JP; Youichi Kuwayama JP. Motor and pressure generating apparatus incorporating the motor. USP2002126498410.
  8. Post Richard F.. Passive magnetic bearing element with minimal power losses. USP1998125847480.
  9. Imlach Joseph. Passive magnetic bearing system. USP1999045894181.
  10. Delamare Jerome (Grenoble FRX) Yonnet Jean-Paul (Meylan FRX) Perrillat-Amede Denis (Annecy FRX). Rotary assembly including in particular radial support means and a magnetic axial abutment. USP1997075652473.
  11. Kotlarek Peter A. (La Crosse WI) Riffe Delmar R. (La Crosse WI). Scroll compressor with axially balanced shaft. USP1989094867657.
  12. Kroy Ralph E. (Tranada Hills CA) Catterfeld Fritz C. (Canoga Park CA). Sealed and balanced motor and fluid pump system. USP1987024644202.
  13. Fukuyama Hiromasa (Ebina JPX) Aihara Satoru (Kawasaki JPX) Murakami Masato (Tokyo JPX) Fujimoto Hiroyuki (Tokyo JPX) Kondoh Akihiro (Tokyo JPX) Takaichi Hiroshi (Tokyo JPX) Koshizuka Naoki (Tokyo JPX. Superconducting bearing unit and operating method thereof. USP1994085341059.
  14. Kanemitsu Yoichi (Kanagawa JPX) Shirao Yuji (Kanagawa JPX). Turbo molecular pump. USP1992105152679.