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1. 发明专利

JPH06319263A INVERTER APPARATUS 失效
公开(公告)号：JPH06319263A
公开(公告)日：1994-11-15
申请号：JP21028191
申请日：1991-07-26
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： MATSUI TAKAYUKI , HORIE SATORU , SAITO HIDEJI , TOYODA EIICHI , SAKATA KAZUHIRO , KAWAKAMI TETSUYA , ANDO TAKESHI , TSUBOI TAKASHI , NAKAMURA KIYOSHI , NAKADA KIYOSHI , TSUTSUI YOSHIO , TANAMACHI TOKUNOSUKE
IPC分类号： B60L9/16 , H02M7/48 , H02M7/497 , H02M7/515 , H02P27/06 , H02P27/08 , H02P7/63
摘要： PURPOSE:To prevent overcurrent and the stoppage of operation by generating a PWM signal with a DC power supply having a neutral point and providing a short-circuit detector and a switch for every unit inverter at the time of driving a multiple inverter having a plurality of unit inverters. CONSTITUTION:A voltage command arithmetic unit 4 generates three-phase AC voltage commands VU* to VW* from a DC power supply having a neutral point with a frequency command f1, and it is inputted to a PWM signal arithmetic unit 3. The arithmetic unit 3 generates a PWM signal to drive a multiple inverter 1 made up of a plurality of unit inverters. The multiple inverter 1 outputs a three-phase AC to rotate a motor 2. A filter circuit 5 detects a current or a voltage for every unit inverter of the multiple inverter 1 to output it to an absolute-value circuit 6. The absolute value sought in the circuit 6 is added 7 to a reference signal SC* to output a deviation to a decision device 8. The unit inverter in which the deviation is not less than a predetermined value is determined to be in the fault phase to fix an output at a zero by opening a path from a direct-current circuit. Thereby, the operation thereof is continued with the remaining sound phases.

2. 发明专利

JPH0583976A ALTERNATING CURRENT MOTOR CONTROLLER AND ELECTRIC ROLLING STOCK CONTROLLER WITH THIS 失效
公开(公告)号：JPH0583976A
公开(公告)日：1993-04-02
申请号：JP23779691
申请日：1991-09-18
申请人： HITACHI LTD , HITACHI TECHNO ENG , HITACHI MITO ENG KK
发明人： MATSUI TAKAYUKI , HORIE SATORU , SAITO HIDEJI , TOYODA EIICHI , SAKATA KAZUHIRO , ANDO TAKESHI , TSUBOI TAKASHI , KAWAKAMI TETSUYA , TAKAKU TOSHIHIKO
IPC分类号： H02P21/00 , B60L9/16 , B60L9/22 , B60L15/02 , H02P21/08 , H02P27/04 , H02P27/06 , H02P27/08
摘要： PURPOSE:To perform stable torque control in the whole operation region by providing a means for controlling the primary current vector of a motor and a means for controlling the slip frequency of the motor, and performing torque control by a vector control system in a low-speed operation region and by a slip frequency control system in the high-speed operation region. CONSTITUTION:A PWM inverter 1 converts DC voltage into 3-phase AC voltage and supplies it to an induction motor 2 to run an electric rolling stock. Forward/ backward command signals and power running/braking command signals outputted from a main controller 7 are put into a control command generator 6. The control command generator 6 generates an exciting current command signal and a torque current command signal for the induction motor 2 on the basis of a filter capacitor voltage signal, a primary angular frequency command signal, the power running/braking command signals and the forward/backward command signals, and transmits them to a voltage command calculator 5, a current controller 8, and a slip angular frequency calculator 19. And the PWM inverter 1 is controlled by both slip frequency control and vector control.

3. 发明专利

JPH0746849A INVERTER 失效
公开(公告)号：JPH0746849A
公开(公告)日：1995-02-14
申请号：JP26837991
申请日：1991-09-19
申请人： HITACHI LTD , HITACHI TECHNO ENG , HITACHI MITO ENG KK
发明人： MATSUI TAKAYUKI , HORIE SATORU , SAITO HIDEJI , TOYODA EIICHI , SAKATA KAZUHIRO , ANDO TAKESHI , TSUBOI TAKASHI , KAWAKAMI TETSUYA , TAKAKU TOSHIHIKO
IPC分类号： H02M7/497 , H02M7/515 , H02M7/5387 , H03K17/04 , H03K17/10 , H03K17/12 , H03K17/56 , H02M7/48
摘要： PURPOSE:To make uniform the loss of switching elements by employing semiconductor devices having low forward voltage drop for the second and third switching elements and semiconductor elements having high switching rate for the first and fourth switching elements. CONSTITUTION:When a series multiplex inverter 1 is subjected to V/f control, the interval where the output voltage goes zero in proportion to the output frequency decreases thus increasing the average current of outside switching elements in proportion to the output frequency although the average current of inside switching elements is substantially constant. In this regard, switching elements having low forward voltage drop are employed for the inside switching elements S2, S3 constituting each phase whereas switching elements having short turn OFF time are employed for the outside switching elements S1, S4. Consequently, the loss due to forward voltage drop of the inside switching element decreases more than the increase of loss due to forward voltage drop of the outside switching element. This constitution prevents increase of loss even it the switching frequency is increased.

4. 发明专利

JPH04334976A INVERTER AND DRIVE SYSTEM FOR AC MOTOR 失效
公开(公告)号：JPH04334976A
公开(公告)日：1992-11-24
申请号：JP10411491
申请日：1991-05-09
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： MATSUI TAKAYUKI , HORIE SATORU , KAWAKAMI TETSUYA , SAITO HIDEJI , TOYODA EIICHI , SAKATA KAZUHIRO , TSUBOI TAKASHI , NAKAMURA KIYOSHI , NAKADA KIYOSHI , TSUTSUI YOSHIO , TANAMACHI TOKUNOSUKE
IPC分类号： B60L3/00 , B60L9/22 , H02H7/122 , H02M7/483 , H02M7/497 , H02P27/06
摘要： PURPOSE:To eliminate the overcurrent due to an erroneous firing and produce a low-harmonic a.c. output by providing a means for switching between two modes that have, respectively, two and three a.c. phase voltage levels. CONSTITUTION:A switch 8 judges the timing of switching between 3-level mode and 2-level mode in response to an inverter output command. After a judgment, the switch 8 supplies an output to a series multiple inverter 4, an indicator 4, and PWM signal processor 18. This completes an operation of switching. If an erroneous firing occurs, a current including a large d.c. component. flows, and the current is led to a neutral point in a d.c. circuit through a diode that connects the neutral point and a switching element. The overcurrent flows to the neutral point along the broken line shown. The magnitude of this d.c. current is limited by reactors 45 and 47. As a result, the overcurrent due to an erroneous firing is prevented, and it is thus possible to produce a low- harmonic a.c. output useful environment involving a lot of noise.

5. 发明专利

JP2002096980A ELEVATOR MAINTENANCE FEE CALCULATION SYSTEM 失效
公开(公告)号：JP2002096980A
公开(公告)日：2002-04-02
申请号：JP2000289111
申请日：2000-09-22
申请人： HITACHI BUILDING SYS CO LTD , HITACHI LTD
发明人： SAKATA KAZUHIRO , ONISHI TOMOJI , TSUYAMA TSUTOMU , KUBOTA KOJI , SUENAGA TORU , HOSAKA MITSUO , KANEZAKI MORIO , GOKO HIROSHI , ISOBE TAKAYUKI , ISSHIKI KANAME
IPC分类号： B66B5/00
摘要： PROBLEM TO BE SOLVED: To provide an elevator maintenance fee calculation system for calculating the costs needed to compensate wear and deterioration, based on the number of elevator startups and operating hours, mainly under actual load, for the purpose of achieving the costs of wear and deterioration compensation which elevator users will admit. SOLUTION: The elevator maintenance fee calculation system calculates the general maintenance fee for a passenger elevator by use of a variety of maintenance costs including the costs of wear and deterioration compensation based on the number of elevator startups and operating hours. An actually loaded condition measuring means 8 for accumulating and measuring actually loaded conditions in which a car 1 is operated while carrying passengers is provided inside an elevator control device 2, and the costs of wear and deterioration compensation are calculated on the basis of the measurements made by the means 8.

6. 发明专利

JP2001283014A INTERNET SALES SYSTEM OF SCREW TYPE HOME ELEVATOR 失效
公开(公告)号：JP2001283014A
公开(公告)日：2001-10-12
申请号：JP2000099030
申请日：2000-03-31
申请人： HITACHI LTD , HITACHI BUILDING SYS CO LTD , HITACHI MITO ENG KK
发明人： NAKAMA YOSHINOBU , SAKATA KAZUHIRO , NARA TOSHIHIKO , MORITA AKIHIKO , UENO AKIO
IPC分类号： B66B3/00 , G06Q10/00 , G06Q30/06 , G06Q50/00 , G06Q50/08 , G06F17/60
摘要： PROBLEM TO BE SOLVED: To improve sales job efficiency by supporting a job concerning the sales of a home elevator. SOLUTION: Computers 5 and 6 communicable with the computer 3 of the seller 2 of the home elevator through the Internet 1 are installed in a construction firm office 4. The computers 5 and 6 are provided with functions to display the specification input pictures for inputting the specification of the home elevator and outputting a drawing including the combination of the home elevator and the home. Then, a drawing including the combination of the home elevator and the home is prepared by the seller's computer 3 based on the specification of the home elevator inputted through the Internet 1 and the drawing is outputted to the Internet 1.

7. 发明专利

JPH0729749B2 失效
公开(公告)号：JPH0729749B2
公开(公告)日：1995-04-05
申请号：JP18734889
申请日：1989-07-21
申请人： HITACHI LTD
发明人： SAKATA KAZUHIRO , CHIBA HISAO
IPC分类号： B66B25/00 , B66B29/00 , G05B9/03 , G05B23/02

8. 发明专利

JPH04189269A CONTROL UNIT FOR WAITER 失效
公开(公告)号：JPH04189269A
公开(公告)日：1992-07-07
申请号：JP31392790
申请日：1990-11-21
申请人： HITACHI LTD
发明人： SAKATA KAZUHIRO , NAKAZAWA SATOSHI
IPC分类号： B66B1/14 , B66B1/46 , B66B3/00
摘要： PURPOSE:To allow a dumb waiter to be immediately operated on any floor by the operation of a specified person by removing a designation call button from an operation board on each floor, and moving it to a portable device having an infrared remote controller formed for exclusive use. CONSTITUTION:A designation call button constituting a call registering means in an operation board 26 on each floor is removed, the designation call button is provided in a portable device 45 having an infrared remote controller integrated thereto, and the infrared remote control signal of this portable device 45 is received by a receiver device 48 provided on the side of a hatch 42 for carrying in and out a load on each floor. Namely, as the operation is conducted by the remote controller 45 formed for exclusive use, only a person using the remote controller 45 can operate a dumb waiter, and the same effect as the operation by a key is obtained. Thus, as the operation can be conducted on any floor if the person has only the remote controller 45, there is no necessity for the person to go to a specified floor each time to conduct the key operation.

9. 发明专利

JPH03256108A RESET CIRCUIT FOR DIGITAL SYSTEM 失效
公开(公告)号：JPH03256108A
公开(公告)日：1991-11-14
申请号：JP5367290
申请日：1990-03-07
申请人： HITACHI LTD
发明人： KASAI SHOJI , HIROSE MASAYUKI , SAKATA KAZUHIRO , SUGIYAMA MASAO
IPC分类号： G06F1/24
摘要： PURPOSE:To prevent the generation of runaway in a microprocessor or miswriting in a memory by connecting a voltage monitoring IC with a a low operation power supply voltage to the output of the other voltage monitoring IC so that these ICs are used for resetting the microprocessor and turning on/off a power supply for the memory. CONSTITUTION:The voltage monitoring IC 1 is connected to the output of the voltage monitoring IC 2 with the low operation power supply voltage, the node between both the ICs 1, 2 is connected to the reset terminal of the microprocessor 3, a reset line L6 inputted to the chip select (CS) terminals of respective memories 5, a decoding circuit 4 for decoding an address bus L9, and the output lines L8 of the circuit 4 are connected to the other CS terminals of respective memories 5, and the micropocessor 3 and the memories 5 are connected to a data bus L7. When the operation of the IC 1 exceeds the operable voltage point (a) of the processor at the rise of the power supply, a reset signal is outputted. The reset signal is outputted before the IC 2 arrives at the point (a). Thereby, an OR logic between the outputs of the ICs 1, 2 is outputted to the line L6. Since the IC 1 is reset before the operation of the microprocessor 3, the microprocessor 3 can be prevented from generating runaway.

10. 发明专利

JPH0289785A DEVICE FOR CONTROLLING FLUID PRESSURE ELEVATOR 失效
公开(公告)号：JPH0289785A
公开(公告)日：1990-03-29
申请号：JP23930288
申请日：1988-09-24
申请人： HITACHI LTD
发明人： HIROSE MASAYUKI , SASAKI HIDEKAZU , SAKATA KAZUHIRO
IPC分类号： B66B1/04 , B66B5/02
摘要： PURPOSE:To surely prevent the abnormal lowering of a riding cage even at the time of the failure of a lowering operation pilot valve or a lowering main control valve by operating a lifting main control valve or the lifting main control valve and a lifting pump at the time of operating an abnormal lowering detecting circuit. CONSTITUTION:An abnormal lowering detecting circuit 18 detects the lowering of a riding cage at a speed above a defined range with respect to a defined command. When this circuit 18 is operating, a lifting main control valve or the lifting main control valve and a lifting pump are operated, to prevent the abnormal lowering of the riding cage while making the riding cage travel to a door zone to rescue passengers.

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