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31. 发明专利

JPH02179300A VARIABLE-SPEED GENERATOR 失效
公开(公告)号：JPH02179300A
公开(公告)日：1990-07-12
申请号：JP33178788
申请日：1988-12-29
申请人： HITACHI LTD , HESCO
发明人： HIRANO KAZUAKI , OKUYAMA TOSHIAKI , YASAKA YASUHIRO
IPC分类号： H02P9/00
摘要： PURPOSE:To reduce the capacity of a controller by controlling the terminal voltage and frequency of an induction generator to predetermined values by the use of a regenerative inverter for regenerating the secondary power of the induction generator to the primary side of the induction generator. CONSTITUTION:A generator has a secondary current controller for full-wave rectifying the secondary current of an induction generator 1 and regulating the secondary current corresponding to the load of the induction generator 1 by the operation of a DC chopper 20 for short-circuiting to turn OFF the output side, and a controller 22 for controlling the terminal voltage and frequency of the induction generator 1 to predetermined values by a regenerative inverter 21 for regenerating the secondary power of the induction generator 1 to the primary side of the induction generator 1. Thus, the capacity of the regenerative inverter 21 is proportional to the secondary power, its capacity can be set to 1/several of the generated power, the element of the DC chopper 20 may be one to largely reduce the capacity of the controller.

32. 发明专利

JPH0241691A STARTER FOR ROTARY ELECTRIC MACHINE AND STARTING METHOD THEREFOR 失效
公开(公告)号：JPH0241691A
公开(公告)日：1990-02-09
申请号：JP19114488
申请日：1988-07-30
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： NAGURA OSAMU , TSUJI EIJI , YASAKA YASUHIRO , NAKAGAWA HIROTO
IPC分类号： H02P1/46 , H02P1/52
摘要： PURPOSE:To enable thyristor starting of a rotary electric machine by connecting an oscillator which can output a voltage having a desired frequency to a controller at the time of starting, and connecting a slip phase detector for detecting a slip phase frequency to the controller after the start is completed. CONSTITUTION:A changeover switch 13a and a circuit breaker 10 are opened and a changeover switch 13b and a circuit breaker 11 are closed at the time of start. Thus, a thyristor converter 7 is connected to the primary side of an AC-excited synchronous generating motor 1. A controller 4 controls a cycloconverter 3 connected to the secondary side of a generating motor in response to a voltage having a desired frequency to be output from an exciting pattern generator 14. When the start is completed to approach a synchronizing speed, the switch 13b is opened, the switch 13a is closed to supply the output of a slip phase detector 6 to the controller. The breaker 11 is opened, and the breaker 10 is closed.

33. 发明专利

JPH01271669A VARIABLE SPEED GENERATION SYSTEM 失效
公开(公告)号：JPH01271669A
公开(公告)日：1989-10-30
申请号：JP9834988
申请日：1988-04-22
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： F03B15/08 , H02P9/04 , H02P9/14
摘要： PURPOSE:To maintain stable rotating speed irrespective of the condition of loads by keeping the frequency of the AC exciting current of a variable speed generator constant in a partial load zone having a fear of generating unstable oscillation. CONSTITUTION:A switchover means 12 optionally selects and outputs one of the output signals of a frequency command signal generating means 11 for generating signals of a defined constant frequency and a phase detector 2. An AC exciting means generates an AC exciting power for a variable speed generator 1 based on the output of the switchover means 12. As the frequency of the AC exciting current of the variable speed generator 1 is kept constant, the variable speed generator 1 acts as a synchronizer, to perform a constant speed operation at a rotating speed which is determined by the difference between the frequency of a power system at this time and the frequency of the AC exciting current.

34. 发明专利

JPH01238448A ROTOR PROTECTOR FOR ROTARY ELECTRIC MACHINE 失效
公开(公告)号：JPH01238448A
公开(公告)日：1989-09-22
申请号：JP6332188
申请日：1988-03-18
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： NAGURA OSAMU , FURUKAWA YOSHIO , YASAKA YASUHIRO , SHIRATA SHINSAKU , TSUJI EIJI , KITA EIZO , NAKAGAWA HIROTO
IPC分类号： H02K17/12
摘要： PURPOSE:To protect a secondary exciting winding from overvoltage by providing on a rotor an auxiliary winding which is independent of the secondary exciting winding and connecting the terminal of this auxiliary winding to a switch which is caused to make and break by a radical change in magnetic flux in the air gap. CONSTITUTION:When a failure occurs to cause an armature winding to be superposed by a dc component, thereby causing an overvoltage to be induced at a secondary exciting winding 1 by a change in magnetic flux in the air gap, thyristors 3a, 3b are turned on to shortcircuit auxiliary windings 2a, 2b. This shortcircuit current generates a counter-magnetic flux which offsets the changed magnetic flux in the air gap, so that the radical change in magnetic flux in the air gap is suppressed to prevent the overvoltage from being generated at the secondary exciting winding 1. Since two pairs of auxiliary windings 2a, 2b are shifted a half pole, either of the auxiliary windings 2a, 2b is located on the direct-axis of the pole, thereby ensuring that the above suppression is performed.

35. 发明专利

JPS63310366A SYNCHRONOUS MACHINE 失效
公开(公告)号：JPS63310366A
公开(公告)日：1988-12-19
申请号：JP14315787
申请日：1987-06-10
申请人： HITACHI LTD
发明人： YASAKA YASUHIRO , FURUKAWA YOSHIO
IPC分类号： H02K55/04
摘要： PURPOSE:To improve maintainability and controllability, by employing superconducting field winding in a synchronous machine and feeding current through a rotary transformer therefor. CONSTITUTION:A rotor having a magnetic pole 7 is provided inside of the stator 8 of generator, and a yoke 9 is provided on the outer circumference of a shaft 11. A field winding 10 composed of wound hollow superconductor internally cooled with liquid nitrogen is fixed to the pole 7. The field winding 10 is coupled through a superconducting lead 12 with a superconducting rotor side transformer coil 5, and a core 3 is arranged at the stator side while facing a stator transformer coil 2 so as to form a magnetic path. The coil 2 is coupled with a static exciter 1. Consequently, stator side current is not required to be coupled with rotor side current through a brush or the like, and current in the field winding 10 can be controlled through coupling of flux of superconducting coil.

36. 发明专利

JPS63310365A BRAKE RESISTOR FOR SUPERCONDUCTING TURBINE GENERATOR 失效
公开(公告)号：JPS63310365A
公开(公告)日：1988-12-19
申请号：JP14315687
申请日：1987-06-10
申请人： HITACHI LTD
发明人： YASAKA YASUHIRO , FURUKAWA YOSHIO
IPC分类号： H02K55/04
摘要： PURPOSE:To make superconducting turbine generator compact, by placing a normal conducting limit resistor at rotary side, and providing a superconducting generator to be used exclusively for feeding power to the limit resistor upon interruption of load and a superconducting switch for opening/closing the circuit thereof. CONSTITUTION:A power generating system employs a water turbine 8 as a prime mover and a superconducting turbine generator 1 as a driven machine. In the generator 1, a rotor coil and a stator coil consist of a superconducting coil and these superconducting coils are coreless structure. And these coils are magnetically shielded with superconducting member. A field coil 2 and a power generating coil 3 constitute a superconducting generator having a disc rotor coil arrangement for supplying power to a brake resistor 7 only when the load is interrupted. Superconducting members are employed entirely except the brake resistor 7 employing normal conducting resistor. Excessive energy of turbine is converted through the brake resistor 7 into thermal energy so as to suppress over speed and over pressure.

37. 发明专利

JPS63178800A VARIABLE-SPEED GENERATOR 失效
公开(公告)号：JPS63178800A
公开(公告)日：1988-07-22
申请号：JP806187
申请日：1987-01-19
申请人： HITACHI LTD , KANSAI ELECTRIC POWER CO
发明人： FURUKAWA YOSHIO , YASAKA YASUHIRO , NAGURA OSAMU , HARAGUCHI EIJI , NAKAGAWA HIROTO , ONO YASUTERU
IPC分类号： H02P9/00 , H02P9/14 , H02P9/42
摘要： PURPOSE:To enable a generator quickly to perform the juxtaposed reentry to a system, keeping no-load effective exciting condition even when the load is cut out, by giving no frequency beyond allowable limits to a frequency converter. CONSTITUTION:To a single feeder to send control signals in a frequency converter 9 are provided the first reference frequency device 11a where the frequency in the system constitutes a function a and the second reference frequency device 11b generating specified frequency. In addition, in a circuit to control the frequency converter 9 is provided a changeover switching device 16 where in the normal operation of a variable-speed generator 5 the output of the first frequency device 11a turns out the control signal of a frequency control device 10 and in the load runout of the variable-speed generator 5 the output of the second reference generator 11b turns out the control signal of the frequency control device 10.

38. 发明专利

JPS6364546A CURRENT COLLECTOR OF ROTARY ELECTRIC MACHINE 失效
公开(公告)号：JPS6364546A
公开(公告)日：1988-03-23
申请号：JP20370186
申请日：1986-09-01
申请人： HITACHI LTD
发明人： SHIRATA SHINSAKU , NIWA SADAHIKO , SAKAI KOICHI , YASAKA YASUHIRO
IPC分类号： H02K13/00 , H01R39/08
摘要： PURPOSE:To reduce influence of carbon dust and heat generation, by a method wherein a slip ring in neutral point phase is disposed at down side in the axial direction in comparison to any slip ring of other phases. CONSTITUTION:Slip rings 3-6 are installed on a rotary shaft 1 through an insulator 2, and brushes 7-10 abut on the slip rings 3-6 thereby a current collector is constituted. In this case, U-W phases from AC secondary excitation windings and N phase in the neutral point phase are arranged in sequence in the axial direction, and the slip ring 6 in N phase is disposed to the lowermost step of the slip rings 3-5 of U-W phases. Root of cooling of each of the slip rings 3-6 and exhaust of carbon dust is performed by air supply from upper side and exhaust from lower side by a fan 11. In this constitution, collection of carbon dust and generated heat amount in U-W phases is applied to N phase, but since allowance of current and voltage in N phase in much higher than that in other U-W phases, the stable current collector can be constituted.

39. 发明专利

JPS61190814A SUPERCONDUCTOR 失效
公开(公告)号：JPS61190814A
公开(公告)日：1986-08-25
申请号：JP3006185
申请日：1985-02-18
申请人： HITACHI LTD , HITACHI SERVICE ENG
发明人： KUROISHI KAZUO , YASAKA YASUHIRO
IPC分类号： H01F6/06 , H01B12/02 , H01B12/16

40. 发明专利

JPS5946704A Superconductive conductor 失效
公开(公告)号：JPS5946704A
公开(公告)日：1984-03-16
申请号：JP15653882
申请日：1982-09-10
申请人： Hitachi Ltd
发明人： YASAKA YASUHIRO , IMURA HIROYA , HOSHI AKIRA , ONO KENICHI
IPC分类号： H01B5/00

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