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1. 发明专利

JPH11178263A ROTOR OF ROTATING ELECTRIC MACHINE 失效
公开(公告)号：JPH11178263A
公开(公告)日：1999-07-02
申请号：JP34101797
申请日：1997-12-11
申请人： HITACHI LTD
发明人： SENBA AKIOMI , WAKUI SHINICHI , IDE KAZUMASA , MIYAGAWA IEMICHI
IPC分类号： H02K3/487
摘要： PROBLEM TO BE SOLVED: To prevent electrolytic corrosion between a wedge and an end damper ring or between a wedge and a tooth by causing wedges, a creepage block, each damper to have tapered parts, causing them to have some degree of freedom in the radial direction against a centrifugal force generated by rotation, and making the contact between substances close. SOLUTION: In the rotor of a rotating electric machine where the field winding of the rotor is pressed down by wedges against centrifugal forces, wedges 3 having tapered parts 9 at the end parts of their bodies are used. Since a wedge 3 and the touching part of an end damper ring with it meet at an angle, a relative slip occurs and the wedge 3 becomes movable in the radial direction, when a centrifugal force in the radial direction by rotation is acting. However, there is a fear of producing a slight space between each wedge 3 and the end damper ring 4, since a sufficient centrifugal force is not generated at the time of low-speed rotation on the occasion of a thyristor start. But, the wedge 3 having a tapered part enables its close adhesion, even if the member of rotation is small, and electrolytic corrosion by an overcurrent can be prevented.

2. 发明专利

JPH10322975A VENTILATING STRUCTURE OF ROTATING MACHINE 失效
公开(公告)号：JPH10322975A
公开(公告)日：1998-12-04
申请号：JP12671797
申请日：1997-05-16
申请人： HITACHI LTD
发明人： MORI HIDEAKI , MIYAGAWA IEMICHI , ISHIHARA ATSUSHI , HATTORI KENICHI
IPC分类号： H02K1/20 , H02K3/24 , H02K3/487 , H02K5/20 , H02K9/06 , H02K9/08
摘要： PROBLEM TO BE SOLVED: To reduce the outside diameter and weight of a generator, even when a high generating capacity by forming a stator so that the components of the stator are laminated with duct spacers in-between so as to form a radial dust, as wall as providing wedges which secure coils housed in the slots in the stator. SOLUTION: A stator is formed by laminating silicon steel plates. A stator core 15 is formed by laminating a large number of thin silicon steel plates, and dust spacers 16, approx. 5-10 mm in height, are inserted at a constant pitch of approx. 20-100 mm to form a radial dust. Stator coils 17 are firmly secured in the slots of the stator by means of wedges 18. For the width of the stator coils 17, some clearance is formed in the slots so that workability is ensured, and the stator insulator is prevented from being damaged by the slots when the stator coils 17 are vibrated by an electromagnetic force. As a result, the distribution of temperature in the stator of a ratating machine with a single section ventilation can be uniformed, and thus generation output higher than in ordinary cases can be obtained.

3. 发明专利

JPH07298693A STARTING CURRENT CONTROLLER AND CONTROL METHOD FOR THYRISTOR STARTING TURBINE GENERATOR 失效
公开(公告)号：JPH07298693A
公开(公告)日：1995-11-10
申请号：JP8125894
申请日：1994-04-20
申请人： HITACHI LTD
发明人： WAKUI SHINICHI , IDE KAZUMASA , OHARAGI HARUO , TAKAHASHI MIYOSHI , MIYAGAWA IEMICHI , YAGI YASUOMI
IPC分类号： H02P1/00 , H02P9/04
摘要： PURPOSE:To ensure a stabilized starting operation at low cost by suppressing the pulsating torque while simplifying the thyristor starter for turbine generator. CONSTITUTION:When a turbine generator TG is started, AC power from a station power supply is converted through a thyristor power supply 4 into DC power which is then converted through an inverter 9 into AC power having a frequency synchronized with the speed before being fed in the form of an armature current. A rotor side field winding 6 is fed with a DC field current through a converter 12. Upon receiving a speed command, an operating section 5 automatically regulates the armature current and field current of the turbine generator within the limit amplitude of pulsation in the desired steady torque at the time of starting the generator as a synchronous motor.

4. 发明专利

JPH07163097A METHOD FOR DIAGNOSING CURRENT COLLECTOR OF TURBINE GENERATOR AND ITS EXCITATION CONTROL METHOD 失效
公开(公告)号：JPH07163097A
公开(公告)日：1995-06-23
申请号：JP30498493
申请日：1993-12-06
申请人： HITACHI LTD
发明人： OHARAGI HARUO , IDE KAZUMASA , WAKUI SHINICHI , OKI NORIHIRO , TAKAHASHI MIYOSHI , MIYAGAWA IEMICHI
IPC分类号： H02K13/00
摘要： PURPOSE:To report malfunctioning of a current collector by detecting the ripple component of direct current flowing in the brushes of a generator having a stator provided with armature windings, and a rotor provided with field windings and a current collector composed of brushes and slip rings, and judging that the current collector is malfunctioning when it is larger than a specified value. CONSTITUTION:When a synchronous generator 1 is started, a starting device 4 is operated with a switch S1 off and with a switch S2 on. And direct current is supplied for excitation from a forward converter 12 to the field windings 6. Next a forward converter 8 and a reverse converter 9 are operated to accelerate the synchronous motor generator 1. When its speed reaches a specified one, the switch S2 for a starting device 4 is turned off and the switch S1 is turned on to transfer it to a power generating condition. The direct current in the field windings 6 from the start to a constant speed during power generating time is supplied from a plurality of slip rings and brushes. When the sliding between the slip rings and the brushes is bad, sparks are generated. Pulsation by the sparks is found by a GT 24 and a detector 23, and when it exceeds a specified value, malfunctioning is reported 50. As a result of this, it becomes possible to generate power stably.

5. 发明专利

JPH06261454A STARTING EQUIPMENT FOR POWER GENERATING FACILITIES 失效
公开(公告)号：JPH06261454A
公开(公告)日：1994-09-16
申请号：JP4808793
申请日：1993-03-09
申请人： HITACHI LTD
发明人： MIYAGAWA IEMICHI
IPC分类号： H02J3/01 , H02M1/12 , H02P1/52 , H02P9/02 , H02P9/04 , H02P9/08
摘要： PURPOSE:To provide a starting equipment for power generating facilities capable of preventing the temperature rise of a generator during start and of fully utilizing the advantage of thyristor start method. CONSTITUTION:A reverse converter equipment 3b made of a self-arc- extinguishing type semiconductor switching element is provided, the reverse converter equipment 3b is connected to the power generator while generators 5a driven by a plurality of gas turbines 6a are being started, and they are operated as an active filter portion 22. By doing this, higher harmonics supplied from a frequency converter equipment during starting are canceled by a compensation current output from the active filter portion 22, so that the flow of eddy current to the rotor of the generators 5a can be prevented and the temperature rise can be surely suppressed.

6. 发明专利

JPH0694507A WATER LEVEL DETECTION DEVICE AND METHOD OF CONFIRMATION OF ITS ACTION 失效
公开(公告)号：JPH0694507A
公开(公告)日：1994-04-05
申请号：JP24299892
申请日：1992-09-11
申请人： HITACHI LTD
发明人： MIYAGAWA IEMICHI , TAKAHASHI YASUHIRO
IPC分类号： G01F23/00 , G01F23/60 , G05D9/12
摘要： PURPOSE:To facilitate the confirmation of action of a level switch by providing a measuring tank connected to a water reservoir tank via upper/lower pipes and a sluice valve, a level switch and a testing valve for confirming the action of the switching in the measuring tank. CONSTITUTION:A second tank 7 is connected to the water reservoir tank 5 via sluice valves 9a, 9b. The sluice valves 9a, 9b are opened and testing valves 10a, 10b are closed usually so that the water level 6a of the water reservoir 5 and the water level 7a of the tank 7 are equalized to measure the water level of the water reservoir tank 5 by means of level switch 8. When confirming the action of the level switch 8, the valve 9a, 9b are closed. The valve 10a is closed and the valve 10b is opened so that the water in the tank 7 is discharged to a drain collector 11 to confirm the action at a low level. The valve 10a is opened and the valve 10b is closed so that the water in the tank 7 is increased to confirm the action at a high level. In this confirmation of the action, the influence from the variation of the amount of the water in the tank 7 to the whole system is so small that the confirmation of the action of the level switch 8 can be carried out even when a dynamo 1 is running.

7. 发明专利

JPH05236681A 失效
公开(公告)号：JPH05236681A
公开(公告)日：1993-09-10
申请号：JP3311592
申请日：1992-02-20
申请人： HITACHI LTD
发明人： MIYAGAWA IEMICHI , SATO HIROSHI
IPC分类号： H02K1/06 , H02K1/16 , H02K1/26 , H02K15/02
摘要： PURPOSE:To improve the changeover working efficiency by constituting the junction face between the fees supporting yoke and the rear side yoke of a fan-shaped iron core into rectilinear shape. CONSTITUTION:A fan-shaped iron core piece 5 is equipped with a junction part 9A which joins a tees supporting yoke 7 having a plurality of tees 6 with a rear yoke 8. And, this junction part 9A is made in rectilinear shape. By making it into the junction 9A in rectilinear shape (rectilinear shape includes a slant straight line) this way, for example, for the cutting work at cutting between the tees supporting yoke 7 and the rear yoke 8, it will do to cut it in rectilinear shape, so cutting work becomes easy to do. Hereby, the efficiency of the cutting work improves.

8. 发明专利

JP2000139050A ROTATING MACHINE 失效
公开(公告)号：JP2000139050A
公开(公告)日：2000-05-16
申请号：JP30983598
申请日：1998-10-30
申请人： HITACHI LTD
发明人： MORI HIDEAKI , SONOBE TADASHI , MIYAGAWA IEMICHI , KIMOTO HIROSHI , SHIBATA TAKASHI , YOKOYAMA SHINGO
IPC分类号： H02K3/24 , H02K9/00
摘要： PROBLEM TO BE SOLVED: To improve cooling capability by structuring the rows of through holes in the forward direction of a conductor and by shunting a ventilation path into rows in the forward direction of the conductor in order to form the ventilation path that continues in the circumferential direction while deviating in the shaft direction of a rotor core. SOLUTION: Cooling gas ventilation paths 20 in which a cooling gas is caused to flow in the shaft direction of a rotor core 3 while flowing in its circumferential direction are formed in winding conductors 15. Through holes 21 made up of two rows of oval through holes 21a, 21b are drilled in the plate conductors 16 except the bottommost one and interphase insulators in the longitudinal direction of the plate conductors in two rows in their width direction. The plate conductors 16 and interphase insulators continue in the circumferential direction of the rotor core 3 while shifting in its shaft direction. This structure increases the cooling area of the cooling gas, thereby making it possible to increase cooling capability.

9. 发明专利

JPH10145998A ROTOR FOR DYNAMO-ELECTRIC MACHINE 失效
公开(公告)号：JPH10145998A
公开(公告)日：1998-05-29
申请号：JP29481396
申请日：1996-11-07
申请人： HITACHI LTD
发明人： ISHIHARA ATSUSHI , MIYAGAWA IEMICHI , TAMAKI TAKASHI , TAKAYAMA KUNIHIRO , MORI HIDEAKI
IPC分类号： H02K3/24
摘要： PROBLEM TO BE SOLVED: To improve cooling efficiency and reduce a machine size, by arranging a spacer and a spacer piece between field winding end parts, and exhausting cold air from an intake port to the outside from a ventilating outlet through a ventilating path. SOLUTION: In a circulating groove 3C of a spacer 3A set up between field windings 1, cooling air adjusted in a spacer piece 3B flows. Relating to a rotor direction, cold air taken in from an end part passes through between the spacer 3A and the field winding 1 to flow into a vent hole 6 provided in a rotor barrel part 11. Relating to a rotor peripheral direction, similarly to an axial direction, the air passes through between the spacer 3A and the field winding 1, from an axial direction passage 10 set up in an internal diametric side of the field winding 1 in a central part, to be guided to a ventilating outlet 5 of the rotor barrel part 11. Since a ventilating path of strut insulator can be lessened, the insulator with a thickness about in the past worked can be used. In this way, cooling efficiency is improved, also a machine size can be contracted.

10. 发明专利

JPH0946947A ROTATOR OF ROTATING ELECTRIC MACHINE 失效
公开(公告)号：JPH0946947A
公开(公告)日：1997-02-14
申请号：JP18880595
申请日：1995-07-25
申请人： HITACHI LTD
发明人： IDE KAZUMASA , TAKAHASHI MIYOSHI , SATO YUKINORI , TAKAHASHI KAZUHIKO , MIYAGAWA IEMICHI , TANAKA YOJI
IPC分类号： H02K3/18 , H02K3/28 , H02K3/52
摘要： PROBLEM TO BE SOLVED: To increase exciting capacity without any sacrifice of a braking action against a changing magnetic field by connecting a series winding group and a shunt winding group in series for formation of a magnetic field winding. SOLUTION: With regard to a direct-axis, magnetic field windings 111, 112 are provided, each of which is connected in series to form a series winding group 110a. In the same way, magnetic field windings 113, 114 are connected in series to form a series winding group 110b. Magnetic field windings 121a, 122a, 123a, 124a and magnetic field windings 121b, 122b, 123b, 124b are accommodated in a rotator slot which is in a section of π at an electric angle with the direct-axis 21 serving as a boundary respectively, and are connected in parallel on end parts 32a, 32b side in the axial direction. These are connected in series at an end part 32b in the axial direction on one side to form a shunt winding group 120 connected in parallel. The series winding group 110a, the shunt field winding group 120 and the series winding group 110a are connected in series in order for formation of a magnetic field winding and connection to a direct current source 61.

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