Magnetic levitation control device and hybrid type magnetic bearing
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02K-001/27
H02K-007/09
F16C-032/04
출원번호
US-0383842
(2010-07-12)
등록번호
US-9203280
(2015-12-01)
우선권정보
JP-2009-167937 (2009-07-16)
국제출원번호
PCT/JP2010/004512
(2010-07-12)
§371/§102 date
20120113
(20120113)
국제공개번호
WO2011/007544
(2011-01-20)
발명자
/ 주소
Masuzawa, Toru
Sasaki, Eisuke
출원인 / 주소
IBARAKI UNIVERSITY
대리인 / 주소
Birch, Stewart, Kolasch & Birch, LLP
인용정보
피인용 횟수 :
1인용 특허 :
6
초록▼
A bias magnetic flux is formed so as to be passed through the electromagnet core of an electromagnet, and a bypass magnetic path, serving as a magnetic path for a control magnetic flux, is formed in parallel with a permanent magnet, the bypass magnetic path being magnetized in a direction in which p
A bias magnetic flux is formed so as to be passed through the electromagnet core of an electromagnet, and a bypass magnetic path, serving as a magnetic path for a control magnetic flux, is formed in parallel with a permanent magnet, the bypass magnetic path being magnetized in a direction in which passage of the bias magnetic flux is blocked, and thus, even if the permanent magnet and the electromagnet are disposed in locations where the mutual magnetic fluxes of the permanent magnet and the electromagnet are superimposed, the control magnetic flux formed by the electromagnet is passed through the bypass magnetic path, whereby loss of the control magnetic flux can be suppressed. Thereby, the permanent magnet and the electromagnet can be disposed in locations where the mutual magnetic fluxes are superimposed, whereby the device can be made smaller in size.
대표청구항▼
1. A magnetic levitation control device for controlling the position of an object to be magnetically levitated with respect to an electromagnet by means of a bias magnetic flux formed by a biasing permanent magnet and a control magnetic flux formed by an electromagnet with two magnetic poles facing
1. A magnetic levitation control device for controlling the position of an object to be magnetically levitated with respect to an electromagnet by means of a bias magnetic flux formed by a biasing permanent magnet and a control magnetic flux formed by an electromagnet with two magnetic poles facing the object to be magnetically levitated closely, wherein the biasing permanent magnet is set between two places facing the two magnetic poles of the electromagnet in the object to be magnetically levitated, so that direction of the bias magnetic flux and direction of the control magnetic flux are same in the electromagnet, anda bypass magnetic path, in which a part of the control magnetic flux passes through a path separate from the biasing permanent magnet, is formed in a farther side of the object to be magnetically levitated from the electromagnet than the biasing permanent magnet, andat least one permanent magnet, forming a magnetic flux in the by pass magnetic path having the same direction as the control magnetic flux passing through the bypass magnetic path, is set in a farther side of the object to be magnetically levitated from the electromagnet than the biasing permanent magnet, so that passage of the bias magnetic flux in the bypass magnetic path is blocked. 2. The magnetic levitation control device according to claim 1, wherein, two permanent magnets in the bypass magnetic path are provided, facing the two magnetic poles of the electromagnet, respectively, and the magnetic force of the two permanent magnets is set such that the magnetic flux densities in the respective gaps between the respective two magnetic poles of the electromagnet and the object to be magnetically levitated are equal to each other. 3. A hybrid type magnetic bearing for controlling the position of a magnetically levitated rotor with respect to an electromagnet by means of a bias magnetic flux formed by a biasing permanent magnet and a control magnetic flux formed by an electromagnet with two magnetic poles facing the object to be magnetically levitated closely, wherein the biasing permanent magnet is set between two places facing the two magnetic poles of the electromagnet in the magnetically levitated rotor, so that direction of the bias magnetic flux and direction of the control magnetic flux are same in the electromagnet, anda bypass magnetic path, in which a part of the control magnetic flux passes through a path separated from the biasing permanent magnet, is formed in a father side of the magnetically levitated rotor from the electromagnet than the biasing permanent magnet, andat least one permanent magnet, forming a magnetic flux in the bypass magnetic path having the same direction as the control magnetic flux passing through the bypass magnetic path, is set in a farther side of the magnetically levitated rotor from the electromagnet than the biasing permanent magnet, so that passage of the bias magnetic flux in the bypass magnetic path is blocked, whereinthe biasing permanent magnet which is concentrically disposed, being magnetized in the radial direction, and the bypass magnetic path connecting between the respective magnetic poles of the biasing permanent magnet are provided in the magnetically levitated rotor, andthe two magnetic poles of the electromagnet face the magnetically levitated rotor from the axial direction, and the electromagnet controls the axial position of the magnetically levitated rotor. 4. The hybrid type magnetic bearing according to claim 3, wherein, as the permanent magnet of the bypass magnetic path, a permanent magnet is provided which is concentrically disposed, being magnetized in the axial direction of the magnetically levitated rotor. 5. The hybrid type magnetic bearing according to claim 4, wherein, the two permanent magnets in the bypass magnetic path are provided, facing the two magnetic poles of the electromagnet, respectively, and the magnetic force of the two permanent magnets is set such that the magnetic flux densities in the respective gaps between the respective two magnetic poles of the electromagnet and the object to be magnetically levitated are equal to each other. 6. A hybrid type magnetic bearing for controlling the position of a magnetically levitated rotor with respect to an electromagnet by means of a bias magnetic flux formed by a biasing permanent magnet and a control magnetic flux formed by an electromagnet with two magnetic poles facing the object to be magnetically levitated closely, wherein the biasing permanent magnet is set between two places facing the two magnetic poles of the electromagnet in the magnetically levitated rotor, so that direction of the bias magnetic flux and direction of the control magnetic flux are same in the electromagnet, anda bypass magnetic path, in which a part of the control magnetic flux passes through a path separated from the biasing permanent magnet, is formed in a farther side of the magnetically levitated rotor from the electromagnet than the biasing permanent magnet, andat least one permanent magnet, forming a magnetic flux in the bypass magnetic path having the same direction as the control magnetic flux passing through the bypass magnetic path, is set in a farther side of the magnetically levitated rotor from the electromagnet than the biasing permanent magnet, so that passage of the bias magnetic flux in the bypass magnetic path is blocked, whereinthe biasing permanent magnet, being cylinder-shaped and magnetized in the axial direction, and the bypass magnetic path connecting between the respective magnetic poles of the biasing permanent magnet are provided in the magnetically levitated rotor, andthe electromagnet is disposed such that the two magnetic poles of the electromagnet face the magnetically levitated rotor from a radial direction, the electromagnet controlling the position of the magnetically levitated rotor in the radial direction.
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이 특허에 인용된 특허 (6)
Okada, Yohji; Kanebako, Hideki; Abe, Keisuke, Controlled radial magnetic bearing.
Hol, Sven Antoin Johan; Van Eijk, Jan; De Klerk, Angelo Cesar Peter; Van Der Schoot, Harmen Klaas, Lithographic apparatus and motor for use in the apparatus.
Stadnik Ivan P. (ulitsa Kievskaya ; 134-A ; kv. 18 Simferopol SUX) Klevets Nikolai I. (ulitsa Z. Kosmodemyanskoi ; 16 Simferopol SUX) Gridnev Alexandr I. (ulitsa Gorkogo ; 85-B ; kv. 31 Vladimir SUX), Multipolar rotor for electric machine with interpolar and polar magnets.
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