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    MAGNETIC BEARING
    4.
    发明专利
    MAGNETIC BEARING 失效

    公开(公告)号：JPS58137618A

    公开(公告)日：1983-08-16

    申请号：JP2013982

    申请日：1982-02-10

    Applicant: NAT AEROSPACE LAB ,  MITSUBISHI ELECTRIC CORP

    Inventor： OOKAMI YOSHIAKI ,  KIDA TAKASHI ,  HAGIWARA SHIROU ,  TSUCHIYA KAZUO ,  YABUUCHI YOSHINORI

    IPC: F16C32/04 ,  F16C39/06

    Abstract: PURPOSE:To provide a magnetic bearing capable of withstanding the centrifugal force when rotating at a high speed by shifting permanent magnets to the stator side and constituting a magnetic path so that the magnetic flux of the permanent magnet is superimposed on that of the electromagnet. CONSTITUTION:A hollow cylindrical electromagnets 3 are provided on the side of the stator 6, and hollow cylindrical permanent magnets 4A and 4B magnetized in the axial direction are provided at both upper and lower ends of the electromagnet 3. On the rotor side, are provided magnetic poles 2 which are in linkage with the magnetic flux due to the permanent magnets 4A and 4B and further with the magnetic flux due to the electromagnets, through gaps. When the magnetic flux (solid line) of the permanent magnets and the magnetic flux (dotted line) of the electromagnets are superimposed on each other and an exciting current is supplied so that the magnetic flux of the electromagnets flows in the direction shown by arrow indicated by dotted line, the magnetic flux of a gap g2 is decreased, and that of a gap g3 is increased, thus the upward attractive force being strengthened. As described above, since the permanent magnets have been shifted to the stator side, the permanent magnet does not undergo the influence of the centrifugal force.

    MAGNETIC BEARING
    7.
    发明专利
    MAGNETIC BEARING 失效

    公开(公告)号：JPS5794127A

    公开(公告)日：1982-06-11

    申请号：JP17017380

    申请日：1980-12-02

    Applicant: NAT AEROSPACE LAB

    Inventor： MURAKAMI TSUTOMU ,  OOKAMI YOSHIAKI

    IPC: F16C32/04 ,  F16C32/06

    Abstract: PURPOSE:To obtain a simple structured magnetic bearing of strong axial rigidity by means of three respective opening magnetic paths between a rotor and a division of a stator, one electromagnetic coil and one permanent magnet. CONSTITUTION:A rotor 1 consists of one yoke 3 comprising a magnetic substance. A stator 2 is divided at least into three pieces and interconnected by a non-magnetic connector 7. Each division 2a-2d of this stator 1 consists of cross- sectional rectangular yokes 8a-8d and cross-sectional angular frame electromagnetic yokes 9a-9d with opened upside. Permanent magnets 10a-10d are placed between the yokes 8 and 9 and electromagnetic coils 11a-11d are placed in a part of the electromagnetic yoke 9 respectively. Three opening magnetic paths 13, 14 and 15 are formed between the rotor 1 and the stator 2. Since the first opening magnetic path 13 is an exclusive path for magnetic flux phi1 of a magnet 10 and magnetic flux density need not be controlled by magnetic flux phi2 from the electromagnetic coil 11, magnetic flux can be fully elevated.

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