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11. 发明专利

JPS62255582A VARIABLE SPEED WATER PUMPING SYSTEM 失效
公开(公告)号：JPS62255582A
公开(公告)日：1987-11-07
申请号：JP9984886
申请日：1986-04-30
申请人： HITACHI LTD
发明人： KUWABARA HISAO , BANDO AKIRA , HAYASHI SHIGEAKI , YOKOYAMA ISAO , NAKAGAWA HIROTO
IPC分类号： F03B15/04
摘要： PURPOSE:To correspond to an electric power system control such as an automatic frequency control or the like, by permitting a regulation of a motor output in accordance with an external command signal while water is pumped up. CONSTITUTION:When a pump head H and a motor output command P0E are given, a motor output is given to a secondary winding phase angle calculation unit 16 so that a secondary winding excitation amount setting unit 17 sets an exciting amount of a secondary winding considering an actual rotational speed N and phase units 22a-23c control excitation for causing an actual motor output to coincide with the command signal. On the other hand, when the pump head H and the motor output command P0E are input, an optimum guide vane opening function generator 33 produces an optimum guide vane opening YOPT. A servo system 14 for operating a guide vane is controlled based on the output for regulating an amount of water passing through a pump. With this arrangement, operation is effected at a rotational speed of maximum efficiency which is different depending on an output.

12. 发明专利

JPS62291476A VARIABLE SPEED TYPE PUMP SYSTEM 失效
公开(公告)号：JPS62291476A
公开(公告)日：1987-12-18
申请号：JP9984986
申请日：1986-04-30
申请人： HITACHI LTD
发明人： KUWABARA HISAO , BANDO AKIRA , HAYASHI SHIGEAKI , YOKOYAMA ISAO , ONO YASUTERU
IPC分类号： F03B15/04
摘要： PURPOSE:To assure a sure pumping start-up by computing an optimum rotation speed command and an optimum guide vane opening command by preliminarily setting the actual rotation speed at a high level upon start-up, and then by controlling the actual rotation speed to decrease to the optimum rotation speed. CONSTITUTION:When a motor output command POE is given, an optimum rotation speed NOPT is output from an optimum rotation speed function generator 30 according to the command POE and a pump head H. The deflection between the optimum rotation speed NOPT and an actual rotation speed N is then calculated by an adding unit 31. The signal of the deflection is output to a guide vane compensation signal circuit 32. An optimum guide vane opening signal YOPT is output from an opening guide vane opening function generator 33 with the command POE and the pump head H as the inputs. The signal synthesized by the signal YOPT and a guide vane compensation signal DELTAYN are given to a hydraulic servo mechanism 14 from the adding unit 34 to control the opening of the guide vane. The actual rotation speed is controlled such that it is once increased before the actual pumping operation beings and, upon start-up, is converged thereafter on the optimum rotation speed.

13. 发明专利

JPS62282171A VARIABLE SPEED PUMPING SYSTEM 失效
公开(公告)号：JPS62282171A
公开(公告)日：1987-12-08
申请号：JP9985086
申请日：1986-04-30
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： KUWABARA HISAO , OGIWARA MASASHIGE , BANDO AKIRA , HAYASHI SHIGEAKI , YOKOYAMA ISAO , ONO YASUTERU
IPC分类号： F03B15/04
摘要： PURPOSE:To realize an economic design of a cyclo-converter by automatically modifying an optimal rotary speed command to be determined according to a drive output command then operating at the outside of a forbidden band. CONSTITUTION:A rotary speed deviation signal outputted from an adding section 31 is fed to a guide vane opening correction signal circuit 32 then corrected by a signal fed from an optimal guide vane opening function generator 33 and fed to a hydraulic servo mechanism 14 for operating a guide vane. If there is a possibility that the optimal rotary speed will be within a forbidden band, the driving output is corrected automatically so as to set such that the lower limit of the forbidden band will be the upper limit based upon a rotary speed command. consequently, the forbidden band causes no actual trouble and an economic design of a cyclo-converter can be realized.

14. 发明专利

JPS62282169A VARIABLE SPEED PUMPING EQUIPMENT 失效
公开(公告)号：JPS62282169A
公开(公告)日：1987-12-08
申请号：JP9984486
申请日：1986-04-30
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： SHIOZAKI JUNICHI , KUWABARA HISAO , BANDO AKIRA , ONO KENICHI , SAKAYORI AKIHIRO , HITOMI ICHIRO , MINATO MASAHIRO , HAYASHI SHIGEAKI
IPC分类号： F03B15/04 , F03B15/16 , H02J15/00 , H02P9/42
摘要： PURPOSE:To enable regulation of a motor load by controlling a frequency converter such that an effective power detection level approaches to a command level then correcting an effective power command signal and inputting to a variable speed driver. CONSTITUTION:A frequency converter controller 35 controls the output frequency of a power converter 3 according to an output signal from a position detector 28 while simultaneously controls the power converter 3 according to a signal from a speed controller 6 or a power controller 8. The power controller 8 functions to reduce the difference of an effective power command signal PE01 to zero and a frequency controller 34 produces a correction signal PE01 for the effective power command PE01. Consequently, the motor load can be regulated and the system can be employed in the power system control such as AFC operation.

15. 发明专利

JPS60132118A CORROSION PROTECTIVE TYPE SHAFT STRUCTURE 失效
公开(公告)号：JPS60132118A
公开(公告)日：1985-07-15
申请号：JP23966483
申请日：1983-12-21
申请人： KANSAI ELECTRIC POWER CO , HITACHI LTD
发明人： HOTSUTA TEIJI , HAYASHI SHIGEAKI , TAKEUCHI MAMORU , HOSAKA NOBUYOSHI , NEMOTO SADAO , KAWAI JIYUICHIROU
IPC分类号： F16C3/02 , F16C35/073 , F16D1/072
摘要： PURPOSE:To protect a shaft from corrosion and at the same time prevent the fatigue crack due to corrosion from generating by a simple structure wherein members impregnated with substance to form passive state film is employed as corrosion protective material. CONSTITUTION:A member 7 impregnated with corrosion inhibitor is inserted in the portion A of a shaft 1. As for the portion B of the shaft 1, corrosion is prevented by inserting the member 7 impregnated with corrosion inhibitor in a position at the stress concentration portion 5 of the shaft 1 and at the same time on the inner peripheral surface of a cylinder 8 inserted between a bearing 10 and the shaft 1.

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