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公开(公告)号：JPH01204900A
公开(公告)日：1989-08-17
申请号：JP3009488
申请日：1988-02-12
Applicant: NAT AEROSPACE LAB
Inventor： NITTA KEIJI , AZUMA HISAO , OTSUBO KOJI , OGUCHI MITSUO , TANEMURA TOSHIHARU , NAKAJIMA ATSUSHI , NAKAMURA YOSHIHIRO , YOSHIMURA SHOICHI , INOUE YASUTOSHI , MATSUMOTO KOTARO , KIBE SEISHIROU , FUJIMORI YOSHINORI , EGUCHI KUNIHISA
Abstract: PURPOSE:To make a spacecraft platform constructible as one structural body without giving any adverse effect on environmental conditions in both elements by connecting the rotating element at the outside to the nonrotating element at the inside through magnetic force in a noncontact state. CONSTITUTION:A spacecraft platform is constituted of a nonrotating element 1 at a central part capable of offering microgravity for space environmental utilization such as the rearing of flora and fauna in space, various astronomical observations, science and engineering experiments and so on, and both rotating elements 5, 6 to generate artificial gravity and offer such environment as making a human being active so comfortably over a long period of time. In this case, the nonrotating element 1 and the rotating elements 5, 6 are coupled together in noncontact by a magnetic coupling part 7. This noncontact part 7 is made into a structure coupled with a rotary coupling part 14 magnetically in and around a nonrotating coupling part 13 or a part of the nonrotating element 1 via a void 15, and thereby it is constituted so as to have both relatively rotated by a motor 16.
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公开(公告)号：JPS62270824A
公开(公告)日：1987-11-25
申请号：JP11238886
申请日：1986-05-16
Applicant: NAT AEROSPACE LAB
Inventor： MURAKAMI TSUTOMU , NAKAJIMA ATSUSHI
Abstract: PURPOSE:To increase the rigidity in axial direction and utilize electric magnet effectively by installing a stator and a rotor, furnishing a solenoid at said stator, and equipping either of the stator and rotor with a plurality of permanent magnets. CONSTITUTION:Flux PHI1 running out from the N pole of permanent magnets 17, 18 returns to S pole via magnetic circuits situated on the way. That is, the flux PHI1 flows into No.3 stator yoke 15 from No.1 stator yoke 13 through No.1 and No.3 rotor yokes 22, 24 and a shortcircuiting magnetic substance 26, and further flows into No.2 stator yoke 14 via No.4 stator yoke 16 and No.4, No.2 rotor yokes 25, 23. As a result, magnetic attraction force is applied to each gap magnetic path G11-G14. At this time, displacement of rotor 12 is sensed by a location sensor 30 for X-axis, to allow current to flow through coils 20a, 20c of solenoids 21a, 21c, and thereby change in the attraction force due to displacement of flux PHI1 caused by permanent magnets 17, 18 is cancelled.
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公开(公告)号：JPS58122299A
公开(公告)日：1983-07-20
申请号：JP195382
申请日：1982-01-09
Applicant: NAT AEROSPACE LAB
Inventor： MURAKAMI TSUTOMU , OOKAMI YOSHIAKI , OKAMOTO OSAMU , NAKAJIMA ATSUSHI
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公开(公告)号：JPH0886315A
公开(公告)日：1996-04-02
申请号：JP24840994
申请日：1994-09-16
Applicant: NAT AEROSPACE LAB
Inventor： NAKAJIMA ATSUSHI , MIYAGAWA YOSHIO , SUDO TAKAO
IPC: F16C32/04
Abstract: PURPOSE: To improve floating force ad resetting force by adding a second permanent magnet inside or near a superconductor, and arranging it so as to show porality opposed to a first permanent magnet. CONSTITUTION: A disc-like magnetic body 11 made of soft iron on a floating side is arranged on a position opposed to a superconductor 10 on a supporting side. A circular permanent magnet 12 is arranged around a surface faced to the side of the super electroconductive body 10 of the magnetic body 11. A columnar permanent magnet 13 is arranged on a center portion. The permanent magnets 12 and 13 are arranged such that they have opposed polarities. Magnetic flux from the permangnet magnets 12, 13 is distributed similarly to the conventional case. The magnetic body 11 on the floating side is floated by repulsion due to Meissner effect. Simultaneously, in the high temperature superconductor 10, resetting force is generated and floating is stabilized by attracting force of a dummy permanent magnet generated inside caused by pinning effect. A second permanent magnet 14 having polarity opposed to the permanent magnet 12 on the floating side is provided on a rear surface of the superconductor 10. Larger repulsion is generated through a pinning center portion, and floating force is further improved.
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公开(公告)号：JPH06185526A
公开(公告)日：1994-07-05
申请号：JP128291
申请日：1991-01-10
Applicant: NAT AEROSPACE LAB , EBARA RES CO LTD , EBARA CORP
Inventor： NAKAJIMA ATSUSHI , MURAKAMI TSUTOMU , SHINOZAKI HIROYUKI , SHIRAO YUJI , KANEMITSU YOICHI
IPC: F16C32/04
Abstract: PURPOSE:To improve axial directional rigidity, that is, passive stable rigidity and to decrease radial directional rigidity, that is, unstable rigidity by setting ratio of the axial directional rigidity to the radial directional rigidity to almost 1.0 or more. CONSTITUTION:In a passive stable magnetic bearing arranged between a rotary part, formed of a rotor and a rotary shaft, and a fixed part provided between the rotor and the rotary shaft, to support the rotary part in the axial direction relating to the fixed part, permanent magnets 1, 2 in a rotary unit side and permanent magnets 4, 5 in a fixed unit side are respectively formed in a ring shape and magnetized in a Z direction of the rotary shaft. The permanent magnets 1, 2 interpose a ring-shaped magnetic material 7 made of ferromagnetic substance from above and below, and the permanent magnets 4, 5 interpose a ring-shaped magnetic material 9 made of ferromagnetic substance from above and below, to arrange magnetic poles so as to be repulsed each other. Accordingly, magnetic flux density between the magnetic materials 7, 9 is easily placed in a saturated condition, to improve axial directional rigidity of the passive stable magnetic bearing.
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Patent Agency Ranking
公开(公告)号：JPH0559282B2
公开(公告)日：1993-08-30
申请号：JP27035287
申请日：1987-10-28
Applicant: NAT AEROSPACE LAB , EBARA SOGO KENKYUSHO KK , EBARA MFG
Inventor： HYAMA HIROKUNI , WATANABE KAZUHIDE , NAKAJIMA ATSUSHI , MURAKAMI TSUTOMU
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公开(公告)号：JPH03202701A
公开(公告)日：1991-09-04
申请号：JP34277489
申请日：1989-12-29
Applicant: NAT AEROSPACE LAB , EBARA RES CO LTD , EBARA CORP
Inventor： NAKAJIMA ATSUSHI , TAKIZAWA MINORU , MURAKAMI TSUTOMU , KANEMITSU YOICHI , SHIRAO YUJI
Abstract: PURPOSE:To make it possible to measure accurate displacement by providing two pairs of coils, i.e. total of four coils, on one side of each sensor of pairs of sensors which are arranged so as to face each other, wiring the two coils in series, and arranging the coils so that the polarities of the neighboring coils are opposite. CONSTITUTION:U-shaped sensor cores 11 - 14 are fixed to an annular supporting member 21 so that gaps are provided between a body to be detected 20 and the cores. A pair of sensor coils 1 and 2, a pair of sensor coils 3 and 4, a pair of sensor coils 5 and 6 and a pair of sensor coils 7 and 8 are provided at the respective poles of the cores 11 - 14. When the body 20 is displaced in the direction Y, the inductances of the coils 1 and 2 and 5 and 6 are changed. When the body 20 is displaced in the direction X, the inductances of the coils 3 and 4 and 7 and 8 are changed. The displacement of the body 20 can be detected by utilizing the changes in inductances. At this time, the coils are arranged so that the directions of the magnetic fluxes generated in the respective coils are directed in the reverse directions to each other when, e.g. the coils 1 and 2 are wired in series. Thus, the electromotive forces generated in the coils 1 and 2 are offset. Therefore the accurate displacement can be measured.
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公开(公告)号：JPS62255614A
公开(公告)日：1987-11-07
申请号：JP9469786
申请日：1986-04-25
Applicant: NAT AEROSPACE LAB , EBARA RES CO LTD
Inventor： MURAKAMI TSUTOMU , NAKAJIMA ATSUSHI , HIYAMA HIROKUNI , INANAGA SEI , WATANABE KAZUHIDE
IPC: F16C32/04
Abstract: PURPOSE:To obtain almost the same stable flotation as that of simultaneous starting by making a time of transient build-up current flow very short and staggering plural bearing starting times. CONSTITUTION:A current necessary for a control reduces abruptly and a margin for starting a next magnetic bearing is produced in a power supply capacity when a flotation article 1 is moved in its floating direction even if the capacity of a power supply 7 has a transient build-up capacity only for one magnetic bearing. Further, a time of a transient build-up current flow is very short because the movement of an article in the transient build-up time is very fast. Accordingly, plural magnetic bearings 2, 3,... can be started successively and stable flotation can be performed can be performed without largely disarranging the position of the flotation article 1.
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公开(公告)号：DE69019491D1
公开(公告)日：1995-06-22
申请号：DE69019491
申请日：1990-12-21
Applicant: NAT AEROSPACE LAB , EBARA RES CO LTD , EBARA CORP
Inventor： NAKAJIMA ATSUSHI , TAKIZAWA MINORU , MURAKAMI CHIKARA , KANEMITSU YOICHI , SHIRAO YUJI
Abstract: An inductance-type displacement sensor (30) which can measure the displacement of a measured object (17) of magnetic material without any contact with the object. A pair of series connected coils (15,16) is provided adjacent to the object (17) so that the inductance of the coils (15,16) varies in response to a displacement of the object (17) from a predetermined position. The inductance, the number of windings, the direction of the windings and the section of each of the cores are so set that the magnetic flux produced by one of the coils runs in a direction opposite to that of the magnetic flux produced by the other coil and the densities of the respective magnetic fluxes are identical with each other.
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公开(公告)号：DE10319491A1
公开(公告)日：2004-02-26
申请号：DE10319491
申请日：2003-04-30
Applicant: NAT AEROSPACE LAB OF JAPAN CHO
Inventor： YANAGISAWA TOSHIFUMI , NAKAJIMA ATSUSHI , KIMURA TAKEO
Abstract: From a plurality of pictures 1 - 1 through 1 - 3 captured at successive time intervals, pictures 2 - 1 through 2 - 3 of regions determined in accordance with the movement of the celestial object are cut out. By deriving median values in regard to the same pixels in each of the cut-out pictures 2 - 1 through 2 - 3 , a median value picture 3 - 1 is created. By deriving median values, the influence of large numbers of fixed starts that hinder the detection of the moving celestial object that moves in the cut-out pictures is eliminated, and only the moving celestial object is permitted to remain. When deriving median value, pixel values indicating singular values are eliminated in advance, so that the effects of the images of large bright light sources and the lost pixels that output no pixel values are effectively reduced. Further, when an average value picture is created using a plurality of median value pictures previously obtained, the detection limit increases and a dark moving celestial object that cannot be detected using a single observation picture can be extracted.
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