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1. 发明专利

JPH07184338A ROTOR FOR ROTARY ELECTRIC MACHINE 失效
公开(公告)号：JPH07184338A
公开(公告)日：1995-07-21
申请号：JP32708493
申请日：1993-12-24
申请人： HITACHI LTD , CHUBU ELECTRIC POWER
发明人： YASAKA YASUHIRO , OKA KIYOSHI , TAKAHASHI NOBUHIRO , TEZUKA YOSHIBUMI , SHIMOMURA HIROAKI
IPC分类号： H02K3/51
摘要： PURPOSE:To provide a rotor for a rotary electric machine which can be protected from damage due to centrifugal force of rotation by preventing a bind part from burning of the large sized rotor having a coil end supported by a sufficient strength. CONSTITUTION:A coil end 5 protruded outward from a groove of an iron core is fixed by a bind material of organic chemical fiber, and also non-combustible coating layers 7 is formed in the periphery of this bind material.

2. 发明专利

JPH07123613A SUPERCONDUCTING MAGNETIC DEVICE 失效
公开(公告)号：JPH07123613A
公开(公告)日：1995-05-12
申请号：JP26456593
申请日：1993-10-22
申请人： HITACHI LTD , TOKYO ELECTRIC POWER CO , KOKUSAI CHODENDO SANGYO GIJUTS , SHIKOKU ELEC POWER
发明人： TANAKA SHOJI , MORIMOTO HIROSHI , YASAKA YASUHIRO , SUZUKI HIROKAZU , ENDO MASAHIKO , SUZUKI TAKEYA , MURAKAMI MASAHITO , TAKAICHI HIROSHI
IPC分类号： H02J15/00 , F16F15/30 , H02J3/30 , H02K7/09 , H02K9/00
摘要： PURPOSE:To offer a superconducting magnetic device that provides a larger magnetic levitation force between a high temperature superconductor and levitating magnet, increased rotation energy stored in a flywheel generator, smaller rotor vibrations, and stable and uniform rotation. CONSTITUTION:A superconducting magnetic device is provided with a high- temperature superconductor 1, magnetic bearings comprising a levitating magnet opposed to the high temperature superconductor, flywheel 7, power supply 11 to supply or take out electric power, and pressure reducing device 17 installed on a generator coolant tank equipped with a coolant tank 3 to store coolant for high temperature superconductor. The device increases, stabilizes, and uniforms the levitation force of the magnetic bearings, increases rotation energy stored in a flywheel generator, and reduces rotor vibration.

3. 发明专利

JPH0775391A APPLICATION METHOD OF VARIABLE SPEED GENERATOR 失效
公开(公告)号：JPH0775391A
公开(公告)日：1995-03-17
申请号：JP21950793
申请日：1993-09-03
申请人： HITACHI LTD , CHUBU ELECTRIC POWER
发明人： OKA KIYOSHI , YASAKA YASUHIRO , SAITO KEIJI , SHIBUYA AKIRA , TAKAHASHI NOBUHIRO , TEZUKA YOSHIBUMI , SHIMOMURA HIROAKI
IPC分类号： H02J3/24 , H02P9/00 , H02P9/14
摘要： PURPOSE:To stabilize power by preventing fluctuation due to voltage drop in a system power. CONSTITUTION:When the voltage drop of transmission lines 2 and 3 increases due to a grounding accident and a load side power decreases, the output of a variable speed generator 5 connected to the load side is adjusted and a load side power 3 is temporarily increased, thus preventing the voltage drop of a system power and hence preventing the fluctuation of the system power and stabilizing power.

4. 发明专利

JPH05199661A POWER CONVERSION DEVICE 失效
公开(公告)号：JPH05199661A
公开(公告)日：1993-08-06
申请号：JP857092
申请日：1992-01-21
申请人： HITACHI LTD
发明人： NAGURA OSAMU , YASAKA YASUHIRO , TSUJI EIJI , MORIMOTO HIROSHI
IPC分类号： H02J3/34 , H02P11/06
摘要： PURPOSE:To improve a resistance against disturbance generated in a power system by supplying an AC exciting current to an AC-excited rotary electric machine from an AC exciter connected to the system. CONSTITUTION:A DC-excited synchronous motor 13 has a revolving field type, its armature winding is connected to a power system 10 of a power source side, and an exciting current is supplied from a DC exciter 14 to its field winding. An AC-excited generator 23 also has a revolving field type, its armature winding is connected to a power system 20 of the power source side, but its rotor has three-phase distributed field windings. An AC exciter 24 having a thyristor element and arbitrarily controlling an output frequency, an output voltage and an output current is connected to the rotor to supply an AC exciting current thereto. Accordingly, the exciters 14, 24 are not affected by influence of disturbance generated in the systems 20, 10 to which the exciters 14, 24 are not connected. Thus, resistances against the disturbances generated in the systems 10, 20 are improved.

5. 发明专利

JPH0279752A ASSEMBLING METHOD AT SITE OF ROTOR FOR LARGE-SIZED ROTARY ELECTRIC MACHINE, HOUSING OF GENERATING STATION AND PIT 失效
公开(公告)号：JPH0279752A
公开(公告)日：1990-03-20
申请号：JP22870888
申请日：1988-09-14
申请人： HITACHI LTD
发明人： SHIRATA SHINSAKU , YASAKA YASUHIRO , NAGURA OSAMU , TSUJI EIJI , AKAGAWA HIROTAKA , SUZUKI MAKOTO
IPC分类号： E02B9/00 , H02K15/00 , H02K15/02 , H02K15/06
摘要： PURPOSE:To conduct the title assembling method efficiently and safely at low cost by dividing and performing assembly work executed while holding a rotor under an erected state and assembly work executed while sustaining the rotor under a horizontal state. CONSTITUTION:When a rotor 10 is assembled, a yoke 14 is laminated on the outer circumference of a spider 13 first under the state A in which the spider 13 having a center as a shaft is erected in a pit 1 by utilizing a crane 50. Cores 15 are laminated on the outer circumference of the yoke 14. The rotor 10 to which said operation is completed is brought down under the state B in which the rotor 10 is laid down in the pit 1 by operating the crane 50. A winding is inserted to the slot sections of the cores 15 under the state, and the terminal sections of the winding are connected. Binding stretching operation in which binding wires composed of steel wires, etc., are wound tightly on the outer circumferential sections of the winding terminal sections 17 is conducted. Brazing operation for unifying the binding wires is performed.

6. 发明专利

JPH01243835A SHORTCIRCUIT DETECTION DEVICE IN EXCITATION CIRCUIT OF ROTATING ELECTRIC MACHINE 失效
公开(公告)号：JPH01243835A
公开(公告)日：1989-09-28
申请号：JP6956588
申请日：1988-03-25
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： YASAKA YASUHIRO , FURUKAWA YOSHIO , NAGURA OSAMU , SHIRATA SHINSAKU , KITA EIZO , NAKAGAWA HIROTO , ONO YASUTERU
IPC分类号： H02K11/00 , H02K19/36
摘要： PURPOSE:To prevent an earth detection device from being subjected to insulation breakdown and to improve reliability, by connecting a line shortcircuit detection resistance of a line shortcircuit detection device to the earth side of a limiting resistance of the earth detection device. CONSTITUTION:A line shortcircuit detection device 40 connects series circuits of a voltage dividing resistance R1 and a line shortcircuit detection resistance r1, which is a variable resistance, respectively to a three-phase circuit of an AC excitation circuit 37. These series circuits are formed into a three-phase bridge in a Y-connection. An earth side of a limiting resistance R2 is connected to the neutral point of this three-phase bridge to complete the constitution. Both terminals of the line shortcircuit detection resistance r1 and the earth detection circuit resistance r2 are introduced to a detection section 6 respectively. Since the line shortcircuit detection resistance r1 is connected to the earth side of the limiting resistance R2, no potential of an isolation amplifier of the line shortcircuit detection device 40 will be so high against the earth as before that the occurrence of shortcircuit there can be prevented.

7. 发明专利

JPS63265516A GROUND-FAULT DETECTOR FOR THREE-PHASE AC CIRCUIT 失效
公开(公告)号：JPS63265516A
公开(公告)日：1988-11-02
申请号：JP9737887
申请日：1987-04-22
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： FURUKAWA YOSHIO , NIWA SADAHIKO , YASAKA YASUHIRO , NAGURA OSAMU , HARAGUCHI EIJI , NAKAGAWA HIROTO , ONO YASUTERU
IPC分类号： G01R31/02 , H02H3/17
摘要： PURPOSE:To enable an apparatus to operate even at 0-several Hz by providing said apparatus with a first comparator for comparing a double end voltage of ground-fault detection resistance with its set point and with a second comparator for comparing the absolute value of a terminal voltage or its hourly variation of said ground-fault detection resistance with the set point thereof. CONSTITUTION:In a first detection circuit, a terminal voltage of detection resistance r is sampled by a sample and hold circuit 9, and its absolute value ¦B¦ is taken by an absolute value circuit 12 and further compared with the set point of said voltage by a comparison circuit 14. In a second detection circuit, the difference voltage between a sampled voltage A and a sampled value B of the first detection circuit is computed by a differential amplifier 10, its absolute value ¦A-B¦ is obtained by an absolute value circuit 11, and further said absolute value ¦A-B¦ is compared with the set point of said difference voltage by a comparator 13. Then, a ground fault is detected by said first and second detection circuits.

8. 发明专利

JPS6343554A WOUND-ROTOR TYPE INDUCTION GENERATOR 失效
公开(公告)号：JPS6343554A
公开(公告)日：1988-02-24
申请号：JP18349986
申请日：1986-08-06
申请人： HITACHI LTD
发明人： YASAKA YASUHIRO
IPC分类号： H02K17/42
摘要： PURPOSE:To reduce voltage ripple caused by slots, by letting the slot number per pole and per phase of a rotor be an irreducible fraction and by selecting its denominator for a specified number. CONSTITUTION:In a WOUND-ROTOR type induction generator, and stator core 2 in respective equal intervals slots 3 and 4, are provided on both rotor core 1 coils 5 and 6 carrying three-phase alternate currents are wound at respective insides of the slots. The slot number per pole and per phase on the rotor side is 3/2, while that on the stator side is 2. (That is, the denominator of the irreducible fraction of the slot number per pole and per phase of a rotor will not be a divisor of the denominator of the irreducible fraction of the slot number per pole and per phase of a stator.) Thus, the voltage ripple caused by the rotor slots 3 can be brought to zero.

9. 发明专利

JPS6028226B2 失效
公开(公告)号：JPS6028226B2
公开(公告)日：1985-07-03
申请号：JP11455678
申请日：1978-09-20
申请人： HITACHI LTD
发明人： HIGUCHI SHIGEO , IWASAKI TSUTOMU , SATO KOJI , HIRAMA YUKIO , WATABE MASATOSHI , WACHI YASUYUKI , YASAKA YASUHIRO
IPC分类号： H02K1/24

10. 发明专利

JPS6084808A SUPERCONDUCTING COIL 失效
公开(公告)号：JPS6084808A
公开(公告)日：1985-05-14
申请号：JP19233683
申请日：1983-10-17
申请人： JAPAN ATOMIC ENERGY RES INST , HITACHI LTD
发明人： TADA EISUKE , YOSHIDA KIYOSHI , KATOU TAKASHI , ANDOU TOSHINARI , SHIMAMOTO SUSUMU , YASAKA YASUHIRO
IPC分类号： H01F6/00 , H01F6/04 , H01L39/04 , H01F7/22
摘要： PURPOSE:To balance a flow rate of cooling medium and improve pre-cooling performance by providing a diffusion plate to diffuse the coolant medium introduced between the spacers provided near a cooling medium introducing port. CONSTITUTION:A diffusion plate 10 is affixed to the spacer near a helium introducing port 5 by inserting the groove of spacer 3 to a guide. Thereby, the helium gas for cooling entering from the helium introducing port 5 is once diverged in the helium diffusion chamber formed by the spacer 3, diffusion plate 10 and internal wall of container 2, then flows as indicated by the arrow mark, cooling the coil. Therefore, the flow rate of helium gas is balanced uniformly pre-cooling the coil. Therefore, the pre-cooling performance is improved and the coil itself is superior in cost, weight and size, resulting in the compact appearance.

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