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1. 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.

2. 发明专利

JPS63224692A CONTROLLER FOR MOTOR AND CONTROL METHOD THEREFOR 失效
公开(公告)号：JPS63224692A
公开(公告)日：1988-09-19
申请号：JP5402187
申请日：1987-03-11
申请人： HITACHI LTD
发明人： MATSUSHITA OSAMI , YONEYAMA MITSUO , TAKAGI KIYOUJI , IZUMI HIDEKI , OOTAKE SHIYOUJI , IDA DOSHU
IPC分类号： H02P23/00 , H02P21/05 , H02P23/04 , H02P23/07 , H02P25/10
摘要： PURPOSE:To change the intensity of magnetic flux density, and to reduce the force of motor-pull by mounting a detector detecting motor-pull in the rectangular two directions of horizontality and verticality in a cross section orthogonal to the shaft of a rotor for a motor. CONSTITUTION:Signals detected from a detector 1 in the X direction and a detector 2 in the Y direction detecting the force of motor-pull generated by the eccentricity of a rotor for an induction motor are input to a control section 3. A signal lowering the force of motor-pull is obtained through arithmetic operation from the phase of three-phase AC voltage detected from an alternating voltage detector 4 for a power supply 6 and the detecting signals from the X detector 1 and the Y detector 2. A current distributor 5 adjusting currents fed to a coil for a stator from the power supply 6 in the induction motor 7 is controlled by the acquired control signal.

3. 发明专利

JPS6165912A Solenoid-type thrust bearing 失效
标题翻译：电磁阀型轴承
公开(公告)号：JPS6165912A
公开(公告)日：1986-04-04
申请号：JP18457884
申请日：1984-09-05
申请人： Hitachi Ltd
发明人： SUGAYA TOYOMI , MATSUSHITA OSAMI , YONEYAMA MITSUO , TAKAGI KIYOUJI
IPC分类号： F16C32/04 , F16C39/06
CPC分类号： F16C32/0476 , F16C32/0461 , F16C32/047 , F16C32/0485
摘要： PURPOSE:To obtain assembling of a thrust bearing without removing a revolving yoke by winding up the cables of electromagnets, which face each other through a revolving yoke, in the same direction and moreover enabling a bearing case to be splitted into two or more pieces with respect to the peripheral direction. CONSTITUTION:Half bearing cases 14, which can be integrated into one cylindrical body connecting them by means of bolts, are prepared. On the periphery of the cases 14 are arranged E-leg-type iron cores 11 at an equal interval, and cables are wound up in such a manner that the three upper half E-leg-type iron cores are integrated into one body. When this thrust bearing is assembled into a rotor, the half structures are inserted from the both upper and lower sides and bolted up, and finally the cable connectors 15 are connected to each other.
摘要翻译：目的：通过将相互面对的电磁铁的电缆卷绕在相同的方向上，通过将电磁铁的电缆卷起来，可获得推力轴承的组装，而不必拆下旋转轭，此外，可以将轴承箱分为两个或多个，相对于周边方向。规定：半轴承箱14可以通过螺栓组装成一个连接它们的圆柱体。在壳体14的周围以相同的间隔设置有E型腿型铁芯11，并且将电缆以三个上半部E型腿型铁芯形成为一体的方式卷起。当该推力轴承组装成转子时，半结构从上下两侧插入并螺栓固定，最后将电缆连接器15彼此连接。

4. 发明专利

JPS6459454A METHOD AND DEVICE FOR FOURIER TRANSFORMATION 失效
公开(公告)号：JPS6459454A
公开(公告)日：1989-03-07
申请号：JP21541187
申请日：1987-08-31
申请人： HITACHI LTD
发明人： MATSUSHITA OSAMI , TAKAGI KIYOUJI , YONEYAMA MITSUO , SUGAYA TOYOMI , KANEKO RYOICHI
IPC分类号： G06F17/14
摘要： PURPOSE:To speed up a processing, by updating a first oscillating waveform value stored in a storage part to the latest sampled oscillating waveform value and performing operation based on the difference between the updated oscillating waveform value and said first oscillating waveform value by an arithmetic processing part. CONSTITUTION:When data is continuously fetched at every oscillating waveform sampling time, contents stored in the storage part are x0, x1,...xN-1, and xN before sampling of a certain oscillating waveform and are x1, x2,...xN, and xN+1 after sampling. That is, x0 is removed from the contents of stored oscillating waveform values and xN+1 is added to those at the time of sampling the oscillating waveform. Since data x1-xN are left in the storage part, Fourier transformation is executed and added xN+1 and removed x0 to perform the operation in accordance with a simple transformation equation. Thus, the processing speed is increased.

5. 发明专利

JPH02280652A LINEAR MOTOR UNIT 失效
公开(公告)号：JPH02280652A
公开(公告)日：1990-11-16
申请号：JP10003989
申请日：1989-04-21
申请人： NAT SPACE DEV AGENCY , HITACHI LTD
发明人： MATSUSHITA TADASHI , FURUKAWA MASAO , SAITOU IKUHIRO , MATSUSHITA OSAMI , TAKAGI KIYOUJI
IPC分类号： H02K33/12 , F25B9/14 , H02K33/00
摘要： PURPOSE:To perform highly accurate centering and to make a linear motor unit compact by arranging a detector for detecting displacement of linear motor shaft in the linear motor shaft and arranging an electromagnetic bearing at the outer diameter side of the linear motor shaft. CONSTITUTION:In a linear motor unit mainly composed of a linear motor shaft 1 and a linear drive motor 2 for reciprocating the linear motor shaft 1, an electromagnetic bearing 3 is arranged at the inside of the linear motor 2 in order to control radial force such that the linear motor shaft 1 is held in neutral position. Displacement detectors 4 for controlling the electromagnetic bearing 3 are arranged at the inside of the linear motor shaft 1 at two positions in X and Y directions with respect to the electromagnetic bearing, and displacement of the linear motor shaft 1 is detected at the inner diameter side. The displacement detector 4 is arranged on a displacement detector fixing member 5 arranged in the linear motor shaft 1. By such arrangement, centering can be carried out with high accuracy.

6. 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.

7. 发明专利

JPH02178770A DEVICE AND METHOD FOR FOURIER TRANSFORMATION 失效
公开(公告)号：JPH02178770A
公开(公告)日：1990-07-11
申请号：JP33403488
申请日：1988-12-28
申请人： HITACHI LTD
发明人： YOSHIDA TOYOMI , MATSUSHITA OSAMI , KONO TAKASHI , TAKAGI KIYOUJI
IPC分类号： G01R23/16 , G06F17/14
摘要： PURPOSE:To make Fourier transformation strong against a noise and an error by Fourier-transforming oscillation waveform values after storing one, at least, of sampled new oscillation waveform values, and simultaneously, removing one, at least, of old oscillation waveform values. CONSTITUTION:The sampled new oscillation waveform value of every period is stored, and simultaneously, one, at least, of the old oscillation waveform value having been stored is removed, and a complex amplitude value in every sampling period is obtained from the complex amplitude value obtained before from difference between one, at least, of the new oscillation waveform values and one, at least, of the old oscillation waveform values. Then, when an oscillation waveform is synchronized with a sampling section, one, at least, of N pieces of sampled data is remarked, and it is averaged. Thus, since the sampled data is a few, possibility to pick up the noise is reduced, and even though the noise is picked up, it can be eliminated by averaging processing.

8. 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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