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1. 发明专利

JPH06147191A MAGNETIC BEARING LOADED CENTRIFUGAL COMPRESSOR AND CENTRIFUGAL FLUID MACHINE DEVICE 失效
公开(公告)号：JPH06147191A
公开(公告)日：1994-05-27
申请号：JP30566492
申请日：1992-11-16
申请人： HITACHI LTD
发明人： HIROSHIMA MINORU , FUKUSHIMA YASUO , MATSUSHITA OSAMI , YONEYAMA MITSUO , SAKANASHI TAKAFUMI , TAKAHASHI NAOHIKO
IPC分类号： F04D29/056 , F04D29/04 , F04D29/05 , F04D29/058
摘要： PURPOSE:To improve the rotor control characteristic and the control accuracy of a magnetic bearing loaded centrifugal compressor. CONSTITUTION:A thrust sensor 24 is installed between a radial magnetic bearing 21a and a thrust magnetic bearing 22a, and mechanical dampers 17a, 17b are installed on both side shaft end areas of a rotor 11. Housings 7a-7d are separately constructed to be individually detached, Thus, it is possible to produce the effects of increasing the rotor natural frequency, improving the detecting sensitivity of a sensor, improving the damping force of a mechanical damper, and easily adjusting the capacity of a mechanical damper.

2. 发明专利

JPH02107816A ROTARY MACHINE PROVIDED WITH MAGNETIC BEARING 失效
公开(公告)号：JPH02107816A
公开(公告)日：1990-04-19
申请号：JP22739089
申请日：1989-09-04
申请人： HITACHI LTD
发明人： YONEYAMA MITSUO , MATSUSHITA OSAMI , TAKAGI MICHIYUKI
IPC分类号： F04D29/056 , F04D19/04 , F04D29/04 , F04D29/058 , F16C32/04
摘要： PURPOSE:To solve the situation of power shortage of a controller for bearing controlling by providing a rotary machine equipped with wings mounted on a rotor, magnetic radial bearing and magnetic thrust bearing pivotally supporting the rotor with a mechanical dynamic damper at the rotary section of the above mentioned rotor. CONSTITUTION:A titled rotary machine is provided with the moving wing 2 equipped to a hanging mirror rotor 1, the stationary wing 4 equipped to the internal surface of a casing 3, and a motor 6 to drive a rotary shaft 5 and is supported by a radial bearings 9a and 9b and thrusts bearings 10a to 10c. A disk 14 is in contact with a end plate 13 and fixed to it by a bolt 15. When the end plate 13 is vibrated, the contact surfaces of the end plate 13 and disk 14 perform different motion from each other because of the difference between their characteristic frequencies. For this reason, a structural damping effect is brought about resulting in the lowering of the vibration of the end plate 13. This leads to the lowering of the response magnification in passing the dangerous speed of the resonance of the wing and the resonance and bending of the end plate resulting in the solution of the situation of power shortage, and as a result, a rotary body stable up to high speed can be obtained.

3. 发明专利

JPH0272217A ELECTROMAGNETIC BEARING UNIT 失效
公开(公告)号：JPH0272217A
公开(公告)日：1990-03-12
申请号：JP21835588
申请日：1988-09-02
申请人： HITACHI LTD
发明人： TAKAGI MICHIYUKI , MATSUSHITA OSAMI , YONEYAMA MITSUO , SAITOU IKUHIRO , INOUE TOMOAKI
IPC分类号： F16C27/06 , F16C32/04 , F16C39/02 , F16C39/06
摘要： PURPOSE:To bring a vibration characteristic at time of being rotated by a protective bearing close to a state at usual time as well as to make a rotor speed down safely by supporting this protective bearing rotating in contact with the rotor at the time of electromagnetic force losing, elastically so as to relax it in the load direction, in a bearing unit which supports the rotor with a magnetic bearing. CONSTITUTION:A rotor 3 in a bearing housing 1 is supported by an electromagnetic bearing 2, and there is provided with a protective bearing 4 for maintaining rotation of this rotor 3 in case of power running down, and usually it is pulled by electromagnet 6 and elastically supported by springs 5 (5a-5d). When power has run down, electromagnetic force of the bearing 4 is lost and simultaneously attraction of the electromagnet 6 is lost as well, whereby the rotor 3 comes into contact with the protective bearing 4, and it maintains its rotation. The protective bearing 4 is being elastically supportied by the springs 5, and a spring constant is preset to be almost equal to the spring constant of the electromagnetic bearing 2 whereby a vibration characteristic at time of being rotated by the protective bearing becomes equal to that at usual time, so that there is no vibration in the rotor 3, thus the degree of safety is improvable.

4. 发明专利

JPH01294117A MAGNETIC LEVITATION TYPE OPTICALLY DRIVEN CONVEYOR 失效
公开(公告)号：JPH01294117A
公开(公告)日：1989-11-28
申请号：JP12178688
申请日：1988-05-20
申请人： HITACHI LTD
发明人： OOTAKE SHIYOUJI , MATSUSHITA OSAMI , OGATA HISANAO , TAKAGI TAKAYUKI , YONEYAMA MITSUO
IPC分类号： B61B13/08 , B60L13/04 , B65G54/02
摘要： PURPOSE:To improve the service life and reliability as well as to make non- pollution achievable by attaching each magnet to the underside and the flank of a conveying body provided with a sail with such a surface as producing a temperature difference when it is illuminated, and supporting them on a track consisting of a superconductive material subject to magnetic repulsion. CONSTITUTION:A light receiving sail 2 is set up in a conveying body 1 with a glass window made into a vacuum. Then, each magnet 4 is set up on the underside and flank of this conveying body 1 and supported on a track 5 consisting of a superconductive material subject to magnetic repulsion against the magnet 4. In this constitution, if light is applied to a black surface of the sail 2, a thrust is produced from the black side to the while side because of light pressure, so that this conveying body 1 is propelled. At this time since the conveying body 1 is floated repulsion lying between the magnet 4 and the track 5, it is moved in a noncontact state. With this constitution, since it does not include any rotational part besides noncontact, lubricating oil becomes unserviceable so that any drop in its service life is prevented from occurring.

5. 发明专利

JPS63259217A ELECTROMAGNETIC BEARING CONTROLLER FOR ROTARY MACHINE 失效
公开(公告)号：JPS63259217A
公开(公告)日：1988-10-26
申请号：JP9310187
申请日：1987-04-17
申请人： HITACHI LTD , HITACHI KOKI KK
发明人： SAITOU IKUHIRO , MATSUSHITA OSAMI , TAKAGI KIYOUJI , YONEYAMA MITSUO , SUGAYA TOYOMI , OOTAKE SHIYOUJI , AIZAWA MASAHARU , NAGATA AKIO
IPC分类号： F16C32/04
摘要： PURPOSE:To enable the passing of a small resonance amplitude by making the electromagnetic coil of the other electromagnetic bearing exert force in the reverse direction when one electromagnetic coil is applied with control current so as to control two electromagnetic bearings. CONSTITUTION:For oscillation that becomes the conical type oscillation mode, the phase becomes opposite depending upon the position of an electromagnetic bearing, i.e., above the drum or below the drum. For that reason, the control current from a power amplifier 4 is let flow to an electromagnetic coil 3b only in frequency that becomes the Z type oscillation mode by a filter 6. Therefore, the electromagnetic coil 3a of an upper electromagnetic bearing and the electromagnetic coil 3b of a lower electromagnetic bearing are each applied with suction forces which oppose each other in each direction and the control becomes possible. Accordingly, controlled by two electromagnetic bearings, it becomes possible to pass with small resonance amplitude to the oscillation that becomes the Z type oscillation mode.

6. 发明专利

JPH05321934A MAGNETIC THRUST BEARING 失效
公开(公告)号：JPH05321934A
公开(公告)日：1993-12-07
申请号：JP13047392
申请日：1992-05-22
申请人： HITACHI LTD
发明人： SAKANASHI TAKAFUMI , FUKUSHIMA YASUO , MATSUSHITA OSAMI , HIROSHIMA MINORU , YONEYAMA MITSUO , TAKAHASHI NAOHIKO
IPC分类号： F04D29/056 , F04D29/04 , F04D29/058 , F16C32/04
摘要： PURPOSE:To enable continuous operation for a long period by composing a magnetic thrust bearing of plural coils and a circular housing having the same number of coil slots as the coils for the coils to be inserted providing a protrusion at a forward end of each coil slot, and inserting plural plates in the circumferential direction. CONSTITUTION:Protrusions are provided in a housing 3 at forward ends of coil slots, a width (a) of a protruding part is set wider than a width (b) of a coil slot part, and a cut is provided at one position of a circumference of the protruding part. A coil 4 is wound at the coil slot part, a plate 5 is inserted from the cut part, and these are installed at several positions in the circumference while moving along the circumference. After assembling the coils 4 and the plates 5 in the housing 3, a varnish process is applied, insulation property of the housing 3, coils 4, and plates 5 is improved, and the coils 4 and the plates 5 are restrained to the housing 3. A magnetic bearing can thus be operated continuously for a long period, and removal of the coils 4 from the housing 3, when it is caused by reduction of restraining force between the coils 4 by secular deterioration, can be prevented by effect of the plates 5.

7. 发明专利

JPH05187442A ROTATING MACHINE EQUIPPED WITH ACTIVE ACTUATOR 失效
公开(公告)号：JPH05187442A
公开(公告)日：1993-07-27
申请号：JP2040692
申请日：1992-01-09
申请人： HITACHI LTD
发明人： YONEYAMA MITSUO , MATSUSHITA OSAMI , FUKUSHIMA YASUO , TAKAHASHI NAOHIKO , HIROSHIMA MINORU , SAKANASHI TAKAFUMI
IPC分类号： F04D29/04 , F04D29/056 , F04D29/058 , F16C32/04 , F16F15/02
摘要： PURPOSE:To reduce vibration of a rotary body by detecting increase, etc., in self-excited vibration due to labyrinth seal swirl and shaft vibration due to surging with a shaft vibrometer and then additionally applying vibration to the rotary body with swirling force synchronized with the oscillation frequency so as to suppress the vibration. CONSTITUTION:An impeller 2 of a centrifugal compressor is supported in its rotating shaft 1 by a thrust bearing 3 and a radial bearing 4. A labyrinth seal 6 consisting of plural seals in between the periphery of the rotating shaft 1 and the inner surface of a casing adjoining thereto is installed. In this case, a magnetic bearing 10 for additionally applying vibration in x, y directions to the rotating shaft l between the radial bearing 4 and a coupling 9 is provided. This is used only for suppressing overvibration. That is, when a vibration detection signal detected by a vibration sensor 7 exceeds a specified level, a switch 13 is turned on by an overvibration decision section 15 and thus the control is achieved by sine wave and cosine wave signals generated synchronously with the frequency by a PLL circuit 11 through an additional vibration controller 12.

8. 发明专利

JPH03134343A DAMPING-ADDING DEVICE FOR ELECTROMAGNETIC BEARING TYPE ROTOR 失效
公开(公告)号：JPH03134343A
公开(公告)日：1991-06-07
申请号：JP27165189
申请日：1989-10-20
申请人： HITACHI LTD
发明人： TAKAGI YUKISHI , YONEYAMA MITSUO , MATSUSHITA OSAMI , INOUE TOMOAKI
IPC分类号： F16F15/12 , F16D3/50 , F16F15/133 , F16F15/14 , F16F15/16 , F16F15/167
摘要： PURPOSE:To restrain a vibrating phenomenon of a high bending mode of a rotor by providing a damping adding means for damping vibration of the rotor at a coupling part of the rotor supported by an electromagnetic bearing and connected through the coupling part. CONSTITUTION:At the end part of a rotor shaft 1, a flange 6 constituting a coupling is installed through a boss part 6C. A diaphragm 8 in the shape matching the flange 6 is fixed to the flange 6 by a plurality of bolts 7, and one end of an intermediate axis 9 is fixed to the center hole of the diaphragm 8. An interval is formed at a predetermined range between the inner diameter surface of the boss part 6C and the outer circumference of the rotor shaft 1, and a viscous oil 10 is poured into this interval as a damping adding means. O rings 11 are provided at both ends in the axial direction of the layer of this viscous oil 10. By this constitution, even if the shaft 1 is vibrated with a high bending vibration, a damping effect of the vibration can be obtained by a damper action of the viscous oil 10.

9. 发明专利

JPH02275112A CONTROLLING DEVICE FOR MAGNETIC BEARING 失效
公开(公告)号：JPH02275112A
公开(公告)日：1990-11-09
申请号：JP9513989
申请日：1989-04-17
申请人： HITACHI LTD
发明人： TAKAGI KIYOUJI , MATSUSHITA OSAMI , YONEYAMA MITSUO , SAITOU IKUHIRO , INOUE TOMOAKI
IPC分类号： F16C32/04
摘要： PURPOSE:To simultaneously adjust a bias current flowing in two control coils of a revolving shaft by differentially adding, subtracting and exciting through the addition and subtraction of one bias command voltage based on signals of a position sensor. CONSTITUTION:Displacement signals of a position sensor 3 detecting shift in a rotor 2 are phase-compensated with a control circuit 4. A bias balance command voltage VO is added, and subtraction is made from a bias command voltage VB by No.1 differential type addition circuit 9a, and a control coil 6a is excited. The output of No.1 differential type addition circuit 9a is subtracted from a value twice the bias command voltage by No.2 differential type addition circuit 9b, then rectified and a control coil 6b is excited. Bias current flowing in two control coils can be adjusted simultaneously and easily by changing one bias command voltage, with the adoption of the device.

10. 发明专利

JPS63225720A ELECTROMAGNETIC BEARING DEVICE 失效
公开(公告)号：JPS63225720A
公开(公告)日：1988-09-20
申请号：JP5659387
申请日：1987-03-13
申请人： HITACHI LTD
发明人： TAKAGI KIYOUJI , MATSUSHITA OSAMI , YONEYAMA MITSUO , IDA DOSHU , OOTAKE SHIYOUJI
IPC分类号： F16C32/04 , F04C29/00
摘要： PURPOSE:To install an electromagnetic bearing device having a large load capacity by disposing notched portions of core-shaped electromagnetic bearings for holding parallel two-shaft rotors on the axes of the rotors in an electromagnetic bearing type screw vacuum pump. CONSTITUTION:A screw vacuum pump using a four-pole electromagnetic bearing is constructed so that electromagnetic bearings 1a, 1b are provided on the suction opening 8 side, and the lower portions of screw rotors 2a, 2b are supported by ball bearings 3a, 3b. The rotor 2a is driven by a motor 6, whereby the rotor 2b is driven through timing gears 5a, 5b to suck air through a suction opening 8 and discharge air through a discharge port 9. In this arrangement, auxiliary bearings 7a, 7b are provided on the upper end of a shaft, and shaft seals 4a, 4b are provided on the lower parts of the rotors in order to prevent entering of lubricating oil. Thus an electromagnetic bearing can be installed in a screw vacuum pump comprising parallel two-shaft rotors, so that vibration can be reduced and reliability can be improved.

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