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21. 发明专利

JPH05296243A 失效
公开(公告)号：JPH05296243A
公开(公告)日：1993-11-09
申请号：JP9515692
申请日：1992-04-15
申请人： HITACHI LTD
发明人： TAKAHASHI NAOHIKO , MATSUSHITA OSAMI , FUKUSHIMA YASUO , YONEYAMA MITSUO , HIROSHIMA MINORU , SAKANASHI TAKAFUMI
IPC分类号： F16C32/04
摘要： PURPOSE:To allow forward signals of period of rotation to pass through a resonance point at small unbalanced vibration in a magnetic bearing controller in which the forward signals of period of rotation, which are in phase with each other in order to cancel out unbalanced forces, are added as inputs to a servo circuit by employing triangle waves as the waveform of the forward signals of period of rotation. CONSTITUTION:In the power amplifier of a controller 4, the maximum value and the rate of change of supply current are limited by a transistor 9 and the inductance L of a bearing coil 2, respectively. Because the electromotive force of the bearing coil 2 cannot exceed the source voltage V of the power amplifier, the rate V/L of change of the current cannot be exceeded. When a sinewave is provided as the indicator voltage of the power amplifier, currents whose rates of change are greater than V/(Lomega) SINomegat are prevented from flowing normally because of that limit. When a triangle wave is provided, the rate of change of the current cannot be greater than V/L but its peak value can be pi/2 as large as that of the sinewave. The fundamental component of the triangle wave whose peak value is 3pV/(2Lomega) is 4/pi times as large at 4V/(pi

22. 发明专利

JPH0552219A MAGNETIC BEARING CONTROL METHOD AND ITS DEVICE 失效
公开(公告)号：JPH0552219A
公开(公告)日：1993-03-02
申请号：JP15791491
申请日：1991-05-31
申请人： HITACHI LTD
发明人： YONEYAMA MITSUO , MATSUSHITA OSAMI , TAKAHASHI NAOHIKO , FUKUSHIMA YASUO
IPC分类号： F16C32/04 , F16C39/06 , F16F15/18 , G05B5/01 , G05B21/02
摘要： PURPOSE:To control change of a rotor rotate shaft of a magnetic bearing so as to be small even high-speed rotation. CONSTITUTION:A position of a rotor is detected by means of a detector 2x. Sampling 3 is carried out with a sampling pulse synchronized with rotation, then meanize treatment 6 is done. Then, Fourier transformation 7, signal treatment 8, Fourier reverse transformation 9 are done to control the position of the rotor. The rotor position control is also carried out with a signal which is prepared by PID treating fluctuation >xi obtained through subtraction of mean value from the sampling value. Rotation is stabilized even if it is high-speed rotation.

23. 发明专利

JPH01275909A HIGH SPEED ROTATING DEVICE 失效
公开(公告)号：JPH01275909A
公开(公告)日：1989-11-06
申请号：JP10393288
申请日：1988-04-28
申请人： HITACHI LTD
发明人： SAITOU IKUHIRO , MATSUSHITA OSAMI , TAKAGI TEISHI , IDA DOSHU , YONEYAMA MITSUO
IPC分类号： G01M99/00 , F16C32/00 , G01N3/32
摘要： PURPOSE:To reduce vibratory amplitude by controlling the supply of electric current to an electromagnetic coil which holds a rotor in a set position by means of a control circuit of a servo circuit of X and Y two channels and a channel cross circuit for low path filter signals. CONSTITUTION:Each displacement of a rotor 1 in X and Y directions is detected with a displacement sensor 2, and respective displacement signals x and y are put into control circuits 5x and 5y in X and Y directions. Results of calculation are put through a power amplifier 4 into an electromagnetic coil 3 which holds the rotor 1 in a set position. Further, displacement signals x and y are put into a low path filter 6, and as for extracted low frequency constituents and y2, x2 is subtracted from y and y2 is added to x by a cross circuit so that improvement is made for attenuation force against swinging vibration caused in a rotary machine and its amplitude can be suppressed to a small value.

24. 发明专利

JPH01206116A SELF-EXCITING VIBRATION PREVENTING CONTROLLER FOR ROTARY MACHINE 失效
公开(公告)号：JPH01206116A
公开(公告)日：1989-08-18
申请号：JP3075788
申请日：1988-02-15
申请人： HITACHI LTD
发明人： SAITOU IKUHIRO , MATSUSHITA OSAMI , TAKAGI MICHIYUKI , YONEYAMA MITSUO
IPC分类号： F16C32/04
摘要： PURPOSE:To automatically extract the self-exciting vibration component and prevent it by using a computer having a tuning filter function and varying the typical frequency according to the revolution speed on the basis of the relation expression stored in the computer. CONSTITUTION:The displacement signals (x) and (y) regarding the displacement in the X and the Y direction of a rotor are sent to control circuits 4x and 4y, respectively and the operated results there of are converted via a power amplifier 5 into a control current (i), which flows through respective electromagnet coils 2. The displacement signals (x) and (y) are sent via an A/D converter to a computer 6 having the tuning filter function of which the typical frequency is that of the vibration frequency of self-exciting vibrations. The computer 6 extracts the self-exciting vibration components (xs') and (ys') only from the displacement vibration components of the rotor, and has a D/A converter 8 multiply the components (alpha) times. The processed component is at the channel crossing point added or subtracted from the signals which indicates displacement of the rotor by 90 deg. from the control circuits 4y and 4x to attenuate the self-exciting vibration. Thus the attenuation force against the forward vibration at the time of the generation of the self-exciting vibration may be improved and the self-exciting vibration be prevented automatically.

25. 发明专利

JPH01126424A ELECTROMAGNETIC BEARING CONTROL DEVICE 失效
公开(公告)号：JPH01126424A
公开(公告)日：1989-05-18
申请号：JP28328987
申请日：1987-11-11
申请人： HITACHI LTD
发明人： YONEYAMA MITSUO , MATSUSHITA OSAMI , TAKAGI MICHIYUKI
IPC分类号： F16C32/04 , H02K7/09
摘要： PURPOSE:To allow vibration to pass through its resonant point with a small resonant amplitude so as to be prevented from developing in its self-excitation by extracting a frequency component to be controlled out of the detected signal components of a rotor displacement by means of a tracking filter. CONSTITUTION:Rotor displacement signals x, y in X direction and in Y direction are input to control circuits 4x, 4y respectively and the results of calculation concerned are input to a power amplifier 5 to force a control current to flow in an electromagnet coil 2. The displacement signals x, y are input to a tracking filter 7 for a rotational frequency component so as to extract only the rotational synchronous component. X signal is multiplied by alphax to be additionally input into a channel in Y direction and y signal is multiplied by alphay to be subtractively input into a channel in x direction. Thus, when the vibration of passes through its resonant point, it can pass through with a small resonant amplitude to be prevented from developing in its self-excitation.

26. 发明专利

JPS6372916A CONTROL DEVICE FOR ELECTROMAGNETIC BEARING 失效
公开(公告)号：JPS6372916A
公开(公告)日：1988-04-02
申请号：JP21390386
申请日：1986-09-12
申请人： HITACHI LTD
发明人： MATSUSHITA OSAMI , TAKAGI TAKAYUKI , YONEYAMA MITSUO , SUGAYA TOYOMI , SAITOU IKUHIRO
IPC分类号： F16C32/04 , F16C39/06
摘要： PURPOSE:To reduce the resonance amplitude of unbalanced vibration at rotational synchronization in a control device for a magnetic levitation-type rotor supported by an electromagnetic bearing by controlling vibration due to rotation of the rotor through crossing of selecting and extracting means and signals in the X and Y directions. CONSTITUTION:A displacement signal x representing detected displacement of a rotor in the X direction is entered in a control circuit 4X, and the result is entered in power amplifiers 5, which supply control current to electromagnet coils 2. The same steps are repeated as to displacement in the Y direction. The detected displacement signals x and y are entered in a tracking filter 7 for rotational synchronization components so as to extract only rotational synchronization components Xn and Yn from the rotor displacement and vibration components. Output signals Xn and Yn from the tracking filter 7 are considered as respective differential signals Y'n and -X'n. In order to provide attenuation effect to the Y direction, the x signal is multiplied by alpha and entered in addition to a Y direction channel. On the other hand, in order to provide attenuation effect to the X direction, the y signal is multiplied by -alpha and entered in addition to a X direction channel.

27. 发明专利

JPS61262225A ELECTROMAGNETIC BEARING CONTROL DEVICE 失效
公开(公告)号：JPS61262225A
公开(公告)日：1986-11-20
申请号：JP9956485
申请日：1985-05-13
申请人： HITACHI LTD
发明人： MATSUSHITA OSAMI , TAKAGI MICHIYUKI , YONEYAMA MITSUO , SUGAYA TOYOMI
IPC分类号： F16C32/04 , F16C39/06
摘要： PURPOSE:To improve stability on forward natural frequency in the vicinity of a resonance point, according to the method wherein a trucking filter having rotation synchronism is additionally used. CONSTITUTION:In order to exert damping action in a direction Y, a signal XN is increased alpha-fold to add it to a channel in a direction Y for input. Meanwhile, in order to exert damping action in a direction X, a signal YN is increased alpha-fold to add it to a channel in a direction X for input. Addition and detection are inputted at channel cross, and this causes a reaction force to a number of revolutions synchronous component to be expressed in FN =-alphayNidenticalkxyy an dFY=+alphaXNidenticalkyxx. Thus, it is equivalent to setting to kxy 0, and this enables improvement of damping properties to forward vibration of a rotor.

28. 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。

29. 发明专利

JPH06300040A ELECTROMAGNETIC BEARING CONTROLLER 失效
公开(公告)号：JPH06300040A
公开(公告)日：1994-10-25
申请号：JP26878091
申请日：1991-09-20
申请人： HITACHI LTD
发明人： MATSUSHITA OSAMI , TAKAGI YUKISHI , YONEYAMA MITSUO , SUGAYA TOYOMI
IPC分类号： F16C32/04
摘要： PURPOSE:To suppress the imbalanced vibration by detecting the position in the radial direction of a rotor from the X and Y directions, controlling the electromagnetic coil electric current so as to hold the rotor at a set position, inputting the detection signal into a revolution speed tracking filter, and addition/subtraction-inputting each direction signal into a servocircuit. CONSTITUTION:The rotor displacement signal (x) in the X direction is inputted into a control circuit 4, and the result of the calculation is inputted into a power amplifier 5, and the control electric current is allowed to flow in an electromagnet coil 2. In case of Y direction, the same passes. The displacement signals (x) and (y) are inputted into a tracking filter 7 as the revolution synchronous component, and only the revolution synchronous components (xN) and (yN) among the displacement vibration components of the rotor are extracted. The differential signals y'N and -x'N are considered for the output signals xN and yN, taking account of only the imbalanced vibration components. In order to apply the damping action in the Y direction, the xN signal is multiplied by alpha, and the result is addition-inputted to the X-direction channel. While, in order to apply the damping action in the X direction, the (yN) signal is multiplied by -alpha, and the result is addition-inputted into the X-direction channel. Accordingly, the damping performance for the forward vibration of the rotor can be improved.

30. 发明专利

JPH06193633A MAGNETIC BEARING CONTROLLING METHOD AND DEVICE 失效
公开(公告)号：JPH06193633A
公开(公告)日：1994-07-15
申请号：JP3014993
申请日：1993-02-19
申请人： HITACHI LTD
发明人： MATSUSHITA OSAMI , YONEYAMA MITSUO , TAKAHASHI NAOHIKO , FUKUSHIMA YASUO , HIROSHIMA MINORU , KANEKI TADASHI , ABE YOSHIAKI , SAKANASHI TAKAFUMI
IPC分类号： F16C32/04
摘要： PURPOSE:To obtain a magnetic bearing controlling method and a device thereof, wherein proof stress of the magnetic bearing is improved by decreasing resonance amplitude of unbalance vibration of revolution synchronization, and also decreasing electric current to flow in the electromagnetic coil of the magnetic bearing. CONSTITUTION:Rotation synchronous components Xn, Yn multiplied by proportional coefficient delta given by coefficient multipliers 23X 23Y are added to outputs of control circuits 4X, 4Y. The purpose is to increase the spring constant, accordingly the resonance point is shifted in the higher direction. Vibration can be decreased by shifting the resonance point to the higher revolutions in the revolution range just before the resonance point. Taking of the coerfficient is the method for restraining the resonance amplitude, and is effective only in critical speed passing. After the critical speed is passed to a considevable entent, this methol is no more needed, but the control of only ABS is desired. Accordingly, when the values of the proportional coefficient alpha, beta are selected according to the revolution range, the most-effective control wherein controlled electric current is minimum in the whole revolution range is made possible.

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