• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A shield or guide to reduce leakage flux in the vicinity of the air gap of a permanent magnet is provided by positioning magnetic sleeves or plates in engagement with surfaces of the permanent magnet adjacent the air gap. The sleeves or plates are polarized at their surfaces which engage the permanent magnet. Each sleeve or plate has its surface which abuts the permanent magnet of the same polarity as the portion of the permanent magnet which it engages. The sleeves or plates may be flexible. Ferrites and cobalt-rare earths are satisfactory magnetic materials for the sleeves and plates.
    公开号:SU824901A3
    申请号:SU731974624
    申请日:1973-10-25
    公开日:1981-04-23
    发明作者:Джеймс Паркер Роллин
    申请人:Дженерал Электрик Компани (Фирма)；
    IPC主号:
    专利说明:

    (54) MAGNETIC SYSTEM
    权利要求:
    Claims (2)
    [1]
    This invention relates to permanent magnet magnetic systems. Magnetic systems are known that contain additional permanent magnets used as magnetic screens and adjoin parts of a magnetic system made of magnetic-hard material Ll. However, the shielding in this system is incomplete and the screen cannot serve as a magnetic conductor. The known magnetic system, containing a permanent magnet with two poles, forming a working air gap, and a screen made of magnetic material and located outside the constant magnet 2. In this magnetic system, the screen only partially covers the pole area and does not allow reducing streams of scattering and distortion of the main stream in the area of the air working gap. The purpose of the invention is to reduce the dispersion fluxes and distortions of the main flux in the air gap region. The goal is achieved by the fact that the screen completely surrounds the poles of the permanent magnet and is in direct contact with them so that it is not in the area of the air working gap, is made of a material having a high coercive force, and the screen forms a magnetic field with a polarity opposite to the direction the flux is scattered, and the direction of the magnetization vector of the screen is perpendicular to the direction of the magnetization vector of a constant magnet. FIG. 1 shows a magnetic system with a hollow cylindrical permanent magnet; in fig. 2 and 3, embodiments of a magnetic sietema with a rectangular permanent magnet. The magnetic system contains a hollow. a cylindrical permanent magnet made of alnico, having a north pole N and a south pole S. A cartridge 1 is adjacent to the north pole of the magnet, made of magnetic material, and a 2f sleeve also made of magnetic material to the south pole. The sleeves 1 and .2, which form the screen, are oriented in a magnetic field in such a way that their outer surfaces have the polarity opposite to the polarity of the magnet pole, and the inner surfaces have a polarity that coincides with the polarity of the magnet 3. As a result, 1x magnetic field emitted by a 3 "magnet. Thus, in this magnetic system, a change in the magnetic flux emitted by the sleeve from the alnico is ensured, and a large part of the flow reflects from back to the sleeve made of alnico. A sufficiently accurate and correct choice of the thickness of the magnetic sleeves 1 and 2 ensures that the magnetic flux density on the outer surface of the magnet 3 is almost close to zero. Under these conditions, the magnetodvolving force of the sleeves 1 and 2 accurately compensates for the magnetomotive force of the surface creating a leakage of magnetic flux from the magnet 3. The described magnetic flux shielding system can work with any permanent magnet or magnet system; The most advantageous is the use of this system in the operation of circuits consisting of permanent magnets made with large cores, providing magnetic flux penetrating large air gaps. The magnetic system contains two permanent magnets 4 and 5, made of alnico, with poles N and S. Part 6, made of steel, is a magnetic conductor. Directly to the north pole of the magnet 4 are adjacent magnetic plates 7-9, and to the south pole - plates 10-12. Here, the magnetic plates 14 7-9 and 10-12 are guiding reflectors of the magnetic flux emitted by the magnets 4 and 5. The magnetic plates 7-9 and 10-12 should preferably be made of magnetic materials consisting of rare earth elements in mixtures with cobalt. The use of such plates as shields preventing leakage of the magnetic flux increases the weight of the permanent magnet very slightly and to a greater extent provides an increase in the effective yield of the magnetic flux. In the gap with high permeability during the experiments it was found that the optimal gap with the corresponding value of the magnetic flux density can be increased by 35%. Claims The invention is a magnetic system containing a permanent magnet with two poles forming a working air gap, and a screen made of magnetic material and located on the outside of the permanent magnet. In order to reduce the scattering fluxes and distortions of the main flux in the area of the air working gap, the screen completely surrounds the poles of the permanent magnet and is in direct contact with them so that it is not in the area of the air working gap, it is made of a material that has a high coercive width. forms a magnetic field with polarity; the opposite of the etched flux is the scattering, and the direction of the magnetization vector of the screen is perpendicular to the direction of the magnetization vector of the permanent magnet. Sources of information taken into account in the examination 1.G. Staats. J. AppJ.Phys. 37 No. 3, p. 1154.
    [2]
    2. US patent number 3593229, H 01 F 7 / Op, 1968.
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    类似技术:
    公开号 | 公开日 | 专利标题
    SU824901A3|1981-04-23|Magnetic system
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    GB792020A|1958-03-19|Improvements in or relating to the magnetic focusing of electron beams
    JPS55104187A|1980-08-09|Television receiver
    JPS5615530A|1981-02-14|Manufacture of color picture tube
    JPS59139689A|1984-08-10|Magneto-resistance element
    JPS55136961A|1980-10-25|Moving coil type device
    JPS57100416A|1982-06-22|Shutter device of electromagnetic drive
    SU1320781A2|1987-06-30|Device for magnetizing annular multipole highly coercive permanent magnets with internal magnetic poles
    GB1206459A|1970-09-23|Convergence device for triple-gun colour television receiver
    GB615257A|1949-01-04|Improvements in or relating to electron microscopes and other electronic apparatus employing electron lenses
    JPS59181505A|1984-10-16|Permanent magnet type magnetic attracting apparatus
    JPS52100195A|1977-08-22|Permanent magnet for electronic lens
    JPH0193031A|1989-04-12|Magnetron
    同族专利:
    公开号 | 公开日
    GB1454754A|1976-11-03|
    FR2204854B1|1979-08-03|
    JPS5629930Y2|1981-07-16|
    NL7314663A|1974-05-01|
    FR2204854A1|1974-05-24|
    US3781736A|1973-12-25|
    DE2347039A1|1974-05-09|
    ES419858A1|1976-07-01|
    JPS49132595A|1974-12-19|
    JPS5596614U|1980-07-04|
    IT995956B|1975-11-20|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2012115534A2|2011-02-22|2012-08-30|Закрытое Акционерное Общество "Нанотехнология Мдт"|Magnetic module|FR1114606A|1954-11-18|1956-04-16|Csf|Improvements to permanent magnets|
    US2925517A|1957-05-23|1960-02-16|Bell Telephone Labor Inc|Electron beam focusing magnetic circuit|
    GB886916A|1958-10-28|1962-01-10|Roe A V & Co Ltd|Improvements in or relating to magnetic circuits employing permanent magnets or electro magnets|
    GB842531A|1958-12-24|1960-07-27|Mullard Ltd|Permanent magnets|
    NL287237A|1961-12-27|
    DE1801974A1|1968-10-09|1970-05-27|Deutsche Edelstahlwerke Ag|Low-scatter permanent magnet system for magnetic dynamic speakers, microphones, etc.|
    US3768054A|1972-04-03|1973-10-23|Gen Electric|Low flux leakage magnet construction|JPS5158323U|1974-10-31|1976-05-08|
    CS213709B1|1979-03-13|1982-04-09|Vaclav Landa|Anizotropous permanent magnets|
    US4359706A|1979-12-18|1982-11-16|Arnold Flack|Magnet pole pieces and pole piece extensions and shields|
    US4549155A|1982-09-20|1985-10-22|The United States Of America As Represented By The United States Department Of Energy|Permanent magnet multipole with adjustable strength|
    US4672346A|1984-04-11|1987-06-09|Sumotomo Special Metal Co., Ltd.|Magnetic field generating device for NMR-CT|
    IT1218679B|1986-09-12|1990-04-19|Marubeni Kk|MAGNETIC THERAPEUTIC DEVICE|
    US5949316A|1995-08-24|1999-09-07|The United States Of America As Represented By The Secretary Of The Army|Magnetic reluctor structures and methods|
    US6573817B2|2001-03-30|2003-06-03|Sti Optronics, Inc.|Variable-strength multipole beamline magnet|
    US7079319B2|2002-02-08|2006-07-18|Rene Helbing|Optical signal control device and method for utilizing same|
    JP4941938B2|2007-10-10|2012-05-30|三菱自動車工業株式会社|Capacitance change detection circuit, touch panel, and determination method|
    US8736136B2|2011-02-16|2014-05-27|Toyota Motor Engineering & Manufacturing North America, Inc.|Magnetic field manipulation in switched reluctance motors and design method|
    US8736128B2|2011-08-10|2014-05-27|Toyota Motor Engineering & Manufacturing North America, Inc.|Three dimensional magnetic field manipulation in electromagnetic devices|
    US8810345B1|2013-08-23|2014-08-19|J. Thomas Goserud|Device for retrieving and securing golf ball marks|
    US10137582B2|2016-11-18|2018-11-27|Wahl Clipper Corporation|Flux bridge for pivot motors|
    EP3382678B1|2017-03-27|2019-07-31|Ecole Polytechnique Federale De Lausanne |An electromagnetic actuator|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US30109472A| true| 1972-10-26|1972-10-26|
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