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1. 发明专利

FR2768271B1 未知
公开(公告)号：FR2768271B1
公开(公告)日：2000-11-10
申请号：FR9811249
申请日：1998-09-09
申请人： HITACHI LTD
发明人： MIURA HARUO , TAKAHASHI KAZUKI , NISHIDA HIDEO , TAKAHASHI NAOHIKO , FUKUSHIMA YASUO
IPC分类号： H02K1/28 , H02K1/27 , H02K15/02 , H02K15/03 , H02K21/12 , H02K21/16
摘要： A manufacturing method of a rotor for a permanent magnet-excited, high-speed electric rotary machine according to the present invention comprises, covering an outer circumferential surface of at least one permanent magnet by a fiber-reinforced plastic protection cover with prestress compressing in radial direction; inserting a steel sleeve into the at least one permanent magnet to form a permanent magnet assembly; preparing at least one permanent magnet assembly; inserting a rotor shaft into the steel sleeve while applying hydraulic pressure to an inner circumferential surface of the steel sleeve of the prepared at least one permanent magnet assembly to expand the steel sleeve; and then removing the hydraulic pressure to tight fit the at least one permanent magnet assembly onto the rotor shaft.

2. 发明专利

DE69319004T2 未知
公开(公告)号：DE69319004T2
公开(公告)日：1998-12-24
申请号：DE69319004
申请日：1993-03-05
申请人： HITACHI LTD
发明人： MATSUSHITA OSAMI , YONEYAMA MITSUHO , TAKAHASHI NAOHIKO , FUKUSHIMA YASUO , HIROSHIMA MINORU , KANEKI TADASHI , ABE YOSHIAKI , SAKANASHI NAOFUMI
IPC分类号： F16C39/06
摘要： A controller of a magnetic bearing controls the rotor speed with a reduced drive current while suppressing rotor vibrations. In addition to the basic Proportional, Integral and Derivative (PID) control (4X,4Y), the controller implements further control methods to ensure the stable operation of the rotor, even at rotor resonance frequencies. An automatic balancing system ("ABS", gain beta ) is applied in conjunction with at least one of: N-cross control system (cross coupling, synchronous with rotor speed, gain alpha ); N-straight control (no cross-coupling, but synchronous, gain delta ); Feed Forward (FF, gain gamma ) control where a control current is applied to generate vibrations equal and opposite to those created by the rotor. A computer (20) in the controller determines the activation of each control method in accordance with a predetermined control plan in response to the detected rotor speed by varying the control parameters alpha , beta , gamma , delta .

3. 发明专利

DE69425698T2 未知
公开(公告)号：DE69425698T2
公开(公告)日：2001-05-03
申请号：DE69425698
申请日：1994-05-17
申请人： HITACHI LTD
发明人： TAKAHASHI NAOHIKO , HIROSHIMA MINORU , MATSUSHISTA OSAMI , FUKUSHIMA YASUO
IPC分类号： F04D29/056 , F04D29/058 , F16C32/04 , F16C39/06 , G05D13/00
摘要： A magnetic bearing is provided with a simulating circuit (10) for estimating a displacement of a rotor (1) on the basis of a force which is exerted on the rotor (1). An output of the simulating circuit (10) is compared with an actual displacement signal. A delay circuit (13) and a subtracter (21) are provided to subtract a run-out which was estimated one period before the rotation of the rotor from the displacement signal. A displacement signal from which the run-out component was eliminated is set to a new displacement signal. A signal which is obtained by adding an estimation run-out of one period before, namely, an output of the delay circuit to the run-out which was estimated by comparing the output of the simulating circuit (10) with the new displacement signal is newly inputted to the delay circuit (13). Due to this, the run-out component is eliminated from the displacement signal of the magnetic bearing, a load of power amplifiers (7a, 7b) for driving electromagnets (3a, 3b) is reduced, there is a surplus for a saturation which is caused in a high frequency band, the reliability of a control system is improved, and a deterioration of a positional accuracy which is caused by the run-out is prevented.

4. 发明专利

FR2689583B1 未知
公开(公告)号：FR2689583B1
公开(公告)日：1995-02-24
申请号：FR9206445
申请日：1992-05-26
申请人： HITACHI LTD
发明人： YONEYAMA MITSUHO , MATSUSHITA OSAMI , TAKAHASHI NAOHIKO , FUKUSHIMA YASUO
IPC分类号： F16C32/04 , F16C39/06 , F16F15/18 , G05B5/01 , G05B21/02 , G05B21/00
摘要： A control method and apparatus for suppressing the vibration components of a magnetic bearing. According to this invention, a vibration wave is sampled at pulses synchronized with the rotation of a rotor, the vibration waveform sampled values at each revolution are averaged, and only the frequency components synchronized with the rotation frequency of the rotor are extracted from the vibration waveform. In addition, the extracted components are subjected to Fourier transform, processed in a frequency region and subjected to Fourier reverse transform. The sequence of these signal processes produces a signal, and the vibration components are suppressed by this signal.

5. 发明专利

DE69425698D1 未知
公开(公告)号：DE69425698D1
公开(公告)日：2000-10-05
申请号：DE69425698
申请日：1994-05-17
申请人： HITACHI LTD
发明人： TAKAHASHI NAOHIKO , HIROSHIMA MINORU , MATSUSHISTA OSAMI , FUKUSHIMA YASUO
IPC分类号： F04D29/056 , F04D29/058 , F16C32/04 , F16C39/06 , G05D13/00
摘要： A magnetic bearing is provided with a simulating circuit (10) for estimating a displacement of a rotor (1) on the basis of a force which is exerted on the rotor (1). An output of the simulating circuit (10) is compared with an actual displacement signal. A delay circuit (13) and a subtracter (21) are provided to subtract a run-out which was estimated one period before the rotation of the rotor from the displacement signal. A displacement signal from which the run-out component was eliminated is set to a new displacement signal. A signal which is obtained by adding an estimation run-out of one period before, namely, an output of the delay circuit to the run-out which was estimated by comparing the output of the simulating circuit (10) with the new displacement signal is newly inputted to the delay circuit (13). Due to this, the run-out component is eliminated from the displacement signal of the magnetic bearing, a load of power amplifiers (7a, 7b) for driving electromagnets (3a, 3b) is reduced, there is a surplus for a saturation which is caused in a high frequency band, the reliability of a control system is improved, and a deterioration of a positional accuracy which is caused by the run-out is prevented.

6. 发明专利

FR2768271A1 Permanent magnet electrical machine rotor, and construction method 未知
公开(公告)号：FR2768271A1
公开(公告)日：1999-03-12
申请号：FR9811249
申请日：1998-09-09
申请人： HITACHI LTD
发明人： MIURA HARUO , TAKAHASHI KAZUKI , NISHIDA HIDEO , TAKAHASHI NAOHIKO , FUKUSHIMA YASUO
IPC分类号： H02K1/28 , H02K1/27 , H02K15/02 , H02K15/03 , H02K21/12 , H02K21/16
摘要： The steel rotor (1) shaft (16) is an interference fit inside a steel sleeve (2) over which e.g., 5 cylindrical rare earth magnets (3) are assembled, end-to-end, their fields radially oriented. Carbon fibre wound under tension, at a very fine pitch, over the magnets, on a resin bed, forms, after oven-curing, a consolidated pre stressed protective cover. Subsequent assembly avoids the application or abstraction of heat to or from any component. After assembling the magnets with dummy end cylinders, on a mandril, the cover is applied, then cured. The dummies are removed and the ends trimmed to receive nonmagnetic end-rings (5, 6). Opt., the magnets are successively pressed into a previously manufactured cover. The sleeve (2), carrying the magnet assembly, is then subjected to hydraulic pressure, internally, via a passage (20b) at one end, which expands it enough to allow the rotor shaft to be inserted, using a hydraulic press.

7. 发明专利

DE69319004D1 未知
公开(公告)号：DE69319004D1
公开(公告)日：1998-07-16
申请号：DE69319004
申请日：1993-03-05
申请人： HITACHI LTD
发明人： MATSUSHITA OSAMI , YONEYAMA MITSUHO , TAKAHASHI NAOHIKO , FUKUSHIMA YASUO , HIROSHIMA MINORU , KANEKI TADASHI , ABE YOSHIAKI , SAKANASHI NAOFUMI
IPC分类号： F16C39/06
摘要： A controller of a magnetic bearing controls the rotor speed with a reduced drive current while suppressing rotor vibrations. In addition to the basic Proportional, Integral and Derivative (PID) control (4X,4Y), the controller implements further control methods to ensure the stable operation of the rotor, even at rotor resonance frequencies. An automatic balancing system ("ABS", gain beta ) is applied in conjunction with at least one of: N-cross control system (cross coupling, synchronous with rotor speed, gain alpha ); N-straight control (no cross-coupling, but synchronous, gain delta ); Feed Forward (FF, gain gamma ) control where a control current is applied to generate vibrations equal and opposite to those created by the rotor. A computer (20) in the controller determines the activation of each control method in accordance with a predetermined control plan in response to the detected rotor speed by varying the control parameters alpha , beta , gamma , delta .

8. 发明专利

JPH11351198A TURBO COMPRESSOR SYSTEM 失效
公开(公告)号：JPH11351198A
公开(公告)日：1999-12-21
申请号：JP29233998
申请日：1998-10-14
申请人： HITACHI LTD
发明人： NISHIDA HIDEO , MIURA HARUO , TAKAHASHI KAZUKI , FUKUSHIMA YASUO , TAKAHASHI NAOHIKO
IPC分类号： F04D27/02 , F04D29/66
摘要： PROBLEM TO BE SOLVED: To provide a turbo compressor system capable of reducing a maintenance cost while restricting noise due to blow-off during non-load operation. SOLUTION: A turbo compressor system includes turbo compressors 1a, 1b connected to a suction pipe 8 provided with a filter 35 in a suction port, a discharge pipe 10 connected to the discharge side of the final stage compressor 1b, a blow-off passage 11 having one end connected to the discharge pipe 10 and the other end connected to the suction side of the first stage compressor 1a and a blow-off valve 4 provided in the blow-off passage 11, wherein the blow-off valve 4 is open during non-load operation to guide compressed air discharged from the final stage compressor 1b via the discharge pipe 10 to the suction side of the first stage compressor 1a. A chamber 14 and a hole 15 are provided at a joint 12 between the other end of the blow-off passage 11 and the suction side of the first stage compressor 1a for using air guided via the blow-off passage 11 during non-load operation to increase the peripheral velocity component of an air flow on the suction side of the first stage compressor 1a.

9. 发明专利

JPH11201098A TWO-STAGE CENTRIFUGAL COMPRESSOR 失效
公开(公告)号：JPH11201098A
公开(公告)日：1999-07-27
申请号：JP446598
申请日：1998-01-13
申请人： HITACHI LTD
发明人： FUKUSHIMA YASUO , MIURA HARUO , NISHIDA HIDEO , TAKAHASHI NAOHIKO , TAKAHASHI KAZUKI
IPC分类号： F04D17/12 , F04B39/06 , F04D13/06 , F04D29/04 , F04D29/58
摘要： PROBLEM TO BE SOLVED: To provide a maintenance-free turbo compressor of a compact structure without using cooling water. SOLUTION: A rotor part of a high frequency motor 1 is formed at a center of a rotor 2, a low pressure stage runner 6 and a high pressure stage runner 7 are installed on both axial end parts of the rotor 2 to compose a multi-stage centrifugal compressor, and this rotor 2 is contactlessly held by radial electromagnetic shaft bearings 3, 4 and a thrust electromagnetic shaft bearing 5. The motor 1 is air-cooled, gas discharged from the low pressure stage and the high pressure stage is heat-exchanged with cooling medium liquid by an intermediate cooler 11 and a discharge cooler 12. Cooling medium liquid flowing through both coolers 11, 12 is heat-exchanged with outer air by a radiator 18. A fan 20 is provided close to the radiator 18, and part of outer air sucked by the fan is used for cooling the motor.

10. 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

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