专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

41. 发明专利

JPS563508A CONTROL METHOD FOR ELECTRIC MOTOR VEHICLE 失效
公开(公告)号：JPS563508A
公开(公告)日：1981-01-14
申请号：JP7881079
申请日：1979-06-21
申请人： MITSUBISHI ELECTRIC CORP
发明人： UEDA YUKIO , YONEHATA YUZURU
IPC分类号： B60L9/12
摘要： PURPOSE:To lighten the current load share of thyristors and to reduce a harmonic component by performing control so that the transfer time of each rectifier may shift each other. CONSTITUTION:The first rectifier MCR1 is controlled by a firing angle alpha and the second and third rectifiers, MCR2 and MCR3, are fired to make thyristors a diode condition. Transfer is performed between the right side arms and left side arms of thyristor bridges every 1.5 cycles to lighten the current load share of thyristors TH21-TH34. On the other hand, the transfer of the second and third rectifiers, MCR2 and MCR3, is controlled to shift by 0.5 cycles respectively and driving operation is executed.

43. 发明专利

JPS5588576A SEMICONDUCTOR CONVERTER 失效
公开(公告)号：JPS5588576A
公开(公告)日：1980-07-04
申请号：JP16338778
申请日：1978-12-27
申请人： FUJI ELECTRIC CO LTD
发明人： KINOSHITA SHIGENORI
IPC分类号： B60L9/12 , H02M7/12 , H02M7/155
摘要： PURPOSE:To increase the maximum regenerating power by providing semiconductor switches which connect a commutation helping circuit to the AC power supply terminals of a converter, and semiconductor switches for inverting commutation- capacitor voltage. CONSTITUTION:An AC power supply 1 is connected to a load 5 by way of an AC- side reactor 2, a main thyristor bridge 3, and a reactor 4. A diode bridge 7 is connected to AC-side terminals a and b of the main bridge 3, and an overvoltage suppression capacitor 8 is connected to the DC side of the diode bridge 7. Furthermore, is provided a commutation helping circuit 6, wherein are connected a commutation capacitor 65 and a commutation reactor 66 which are connected in series with thyristors 61 and 62, and thyristors 63 and 64 for inverting the voltage of the commutation capacitor 65. Therefore, the effect of the AC-side reactance 2 can be eliminated, and the regenerating power from an inverter 10 can be increased.

45. 发明专利

JPS5563574A RECTIFIER DEVICE 失效
公开(公告)号：JPS5563574A
公开(公告)日：1980-05-13
申请号：JP13575378
申请日：1978-11-06
申请人： FUJI ELECTRIC CO LTD
发明人： KINOSHITA SHIGENORI
IPC分类号： H02M7/19 , B60L9/12 , H02M7/12 , H02M7/155
摘要： PURPOSE:To minimize higher harmonic components contained in the primary current of the AC converter by so setting the value of reactance of an AC converter winding that the commutation of each converter will be done in the prescribed order when each converter simultaneously starts its commutation. CONSTITUTION:A commutation current of the first converter starts to flow and during this commutation period a change of the commutation current of other converters 14-22 is held almost at zero. At the phasial angle point of the completed commutation of the first converter 12 the commutation current of the second converter 14 starts to flow and during this commutation period the current change of the other converters 16-22 is held almost at zero and at the phasial angle of the point of completed commutation of the second converter 14, the third converter 16 commutation current starts to flow. Likewise each converter commutation is done in turn and at the phasial angle of the finished commutation of the last converter 22 the communication of all converters 16-22 will finish.

46. 实用新型

JPS5554929U 失效
公开(公告)号：JPS5554929U
公开(公告)日：1980-04-14
申请号：JP13932278
申请日：1978-10-11
IPC分类号： H01F27/28 , B60L9/12 , H01F30/00 , H02M7/04 , H02M7/10 , H02M7/12 , H02M7/19 , H01F31/04

49. 发明专利

JPS5495314A ELECTRIC TRAIN CONTROLLER 失效
公开(公告)号：JPS5495314A
公开(公告)日：1979-07-27
申请号：JP201978
申请日：1978-01-13
申请人： HITACHI LTD
发明人： KOUNO TOSHIKATSU , NOZAKI YOSHIO
IPC分类号： B60L7/04 , B60L9/12
摘要： PURPOSE:To prevent a rapid change of a braking force at a change over of resistors by detecting that a vehicle speed reaches to a predetermined value with a vehicle speed detector, and then decreasing a field current to a predetermined value to change over a resistor in a dynamic brake at braking. CONSTITUTION:When a main motor 8 is operated as a separately excited generator by connecting its armature to a dynamic brake resistor 11 and closing a braking switch 15 to decrease a current of a field winding 13 through a rectifier 4d at dynamic braking, a decision circuit checks whether a vehicle speed reaches to the speed to be change over reistance of the dynamic brake resistor 11 or not base on an output from a vehicle speed detector and commands to decrease the field current to a predetermined value and the resistor is changed over with a circuit breadker 12 after detection of this decrese. By this means, a smooth change over of the brake resistor can be made without a rapid change of a braking force in a main circuit.

你已经成功收藏专利！

检索式保存成功!

IPRDB