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    SUPERCONDUCTING BEARING
    12.
    发明专利
    SUPERCONDUCTING BEARING 失效

    公开(公告)号：JPH08152022A

    公开(公告)日：1996-06-11

    申请号：JP27764192

    申请日：1992-09-03

    申请人： ALLIED SIGNAL INC

    发明人： TOOMASU KEE RITSUJINII JIYUNIA ,  MAASHIYARU PII SABIRU

    IPC分类号： F16C32/04 ,  H01F6/00

    摘要： PURPOSE: To increase a load capacity by providing permanent magnets laminated in alternating polarity for generating magnetic fields, a magnetic metal shim for giving a gap for increasing a magnetic flux gradient between a pair of adjacent permanent magnets, and a superconducting member for communicating one surface with magnetic fields from the pair of adjacent permanent magnets. CONSTITUTION: One surface of a laminated structure 14 is placed to face a superconducting member 12, permanent magnets 16a to 16c are arrayed in alternating polarity, and a magnetic flux line flows between the N and S poles of the permanent magnets 16a and 16c, and between the magnetic poles of the adjacent magnets. Thus, the number of magnetic flux lines per unit area is increased, a magnetic flux density is increased between the N and S poles in one surface of the laminated structures 16b and 16c, the length of the magnetic flux line becomes short, and a magnetic flux gradient is increased. A non-magnetic shim 17 is arranged among the permanent magnets 16a to 16c to reduce magnetic flux leakage. During an operation, the superconducting member 12 is cooled, and the load capacity and stiffness of a thrust bearing 10 are greatly increased as an operation temperature is reduced equal to a critical temperature Tc or lower.

    MEASURING METHOD OF RF PULSE FREQUENCY
    15.
    发明专利
    MEASURING METHOD OF RF PULSE FREQUENCY 失效

    公开(公告)号：JPH07318598A

    公开(公告)日：1995-12-08

    申请号：JP15506795

    申请日：1995-05-19

    申请人： ALLIED SIGNAL INC

    发明人： PEI HOWA ROO ,  ERIOTSUTO JIEI GURIIN

    IPC分类号： G01R23/02 ,  G01R23/14 ,  G01R23/165 ,  G01R23/173 ,  G01S7/02 ,  G01S7/288 ,  G06F11/22

    摘要： PURPOSE: To enable the frequency of RF pulses to be measured at an RF signal frequency with high precision by computing the RF pulse stream frequency by adding an intermediate pulse stream frequency and a control frequency. CONSTITUTION: An input signal generated by an unit under test UUT device is converted to a pulse stream of a low frequency having an intermediate frequency IF. A mixer 22 receives as input a test signal from a signal supply source 20 and a control frequency generated from a local oscillator 24 and outputs an IF signal as a difference between those frequencies. The IF signal is passed through a BPF26 so as to eliminate undesirable high frequency component. The IF signal is subjected to sampling by means of a digitizer 28, transferred to a signal processor 30 and subjected to frequency analysis. The desirable frequency of the IF signal is about 20 to 30% of a digitized sampling frequency. It is desirable that an least two cycles of the IF signal passed a down converter under the sampling frequency of a selected digitizer exist inside of each captured pulse of test signal.