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1. 发明专利

JP2002068621A OPERATION STATE OUTPUT DEVICE OF ELEVATOR 失效
公开(公告)号：JP2002068621A
公开(公告)日：2002-03-08
申请号：JP2000265998
申请日：2000-08-30
申请人： HITACHI LTD
发明人： HOSHINO TAKAMICHI , SAITO HIDEJI , FUJINO ATSUYA , YONEDA KENJI
IPC分类号： B66B3/00 , B66B5/00
摘要： PROBLEM TO BE SOLVED: To discriminate a door opening period from operation data storing information on a car position of an elevator and a door closing signal. SOLUTION: In this device for outputting an operation chart for indicating the car position of the elevator by reading out the operation data storing the information on the car position of the elevator, the device is provided with a means for changing a line kind or a color tone of the car position while turning off a closing signal of a door by inclusively gathering a door related signal of the elevator in the operation data, and can output the operation chart enabled to discriminate the door opening period.

2. 发明专利

JP2001145331A SNUBBER CIRCUIT OF POWER CONVERTER 失效
公开(公告)号：JP2001145331A
公开(公告)日：2001-05-25
申请号：JP32065299
申请日：1999-11-11
申请人： HITACHI LTD
发明人： OKAYASU TAKESHI , OZAWA HIROYUKI , SAITO HIDEJI
IPC分类号： H02M1/00
摘要： PROBLEM TO BE SOLVED: To prevent the break of a free wheel diode parallel connected, in a reverse polarity, to a semiconductor switching element which is one of components of a power converter, by suppressing excessive vibrating voltage generated at the reverse recovery of the diode. SOLUTION: This snubber circuit is parallel connected to the semiconductor switching element to which the free wheel diode is parallel connected in reversed polarity, and does not include a snubber diode consisting of a series connected body of a snubber resistor and a snubber capacitor, wherein a DF resistor for suppressing excessive voltage generated at the reverse recovery of the free wheeling diode is parallel connected to the snubber resistor.

3. 发明专利

JPH1094270A INVERTER APPARATUS 失效
公开(公告)号：JPH1094270A
公开(公告)日：1998-04-10
申请号：JP21290597
申请日：1997-08-07
申请人： HITACHI LTD
发明人： MORI MUTSUHIRO , SAITO RYUICHI , KIMURA ARATA , NAKADA KIYOSHI , SAITO HIDEJI , HORIE SATORU
IPC分类号： H02M7/5387 , H02P27/06 , H02P7/63
摘要： PROBLEM TO BE SOLVED: To decrease the size and noise of an inverter and to increase its frequency and reliability by a method wherein a plurality of arms which are connected across respective DC terminals and respective AC terminals and in which two parallel circuits by respective switching elements and by opposite- polarity diodes are connected in series are constituted of respective single modules. SOLUTION: A plurality of arms constituted in such a way that they are connected across respective DC terminals T1, T2, T3 and respective AC terminals T4, T5, T6 and that two parallel circuits by respective switching elements S11 to S14, S21 to S24, S31 to S34 and by diodes D11 to D14, D21 to D24, D31 to D34 whose polarity is opposite to that of the elements are connected in series are connected by respective clamping diodes Dc 11, Dc 12, Dc 21, Dc 22, Dc 31, Dc 32 are constituted of respective single modules M11, M12, M21, M22, M31, M32. In addition, a voltage across the DC terminals T1 and T2, T1 and T3, T3 and T2 as pairs is 1500V. As a result, a wiring length is made short, and wiring inductance is made small.

4. 发明专利

JPH09182446A POWER CONVERTER 失效
公开(公告)号：JPH09182446A
公开(公告)日：1997-07-11
申请号：JP33850795
申请日：1995-12-26
申请人： HITACHI LTD
发明人： KANEKO TAKASHI , HORIE SATORU , SAITO HIDEJI
IPC分类号： H02M7/48 , H02M7/5387 , H03K17/16
摘要： PROBLEM TO BE SOLVED: To obtain the power converter having the compact configuration and the high safety by decreasing the fluctuation of a voltage applied on a self-extinguishing-type element included in another serial body in switching a self-extinguishing-type element included in one serial body, and thereby decreasing a recovery voltage. SOLUTION: When this device is applied in a three-phase serial multilayered inverter, snubber capacitors 31-39 and 40-48 are mutually connected through resonance suppressing resistors 101-103, 104-106, 107-109 and 110-112. Furthermore, shubber resistors 4-6 are connected to the connecting points of the snubber capacitors, the positive side of a DC power supply 1, the negative side of a DC power supply 2 and between the connecting points, respectively. The current flowing through the snubber capacitor 33 is shown by an arrow. Since the resonance suppressing resistors 104 and 105 are present, a short-circuit path is not formed. Since the resonance current can be attenuated by the resonance resistors 104 and 105, the recovery voltage of a clamping diode 73 can be decreased, and a surge voltage applied on an IGBT 16 can be decreased.

5. 发明专利

JPH07131907A INVERTER GROUP CONTROLLER FOR ELECTRIC RAILCAR 失效
公开(公告)号：JPH07131907A
公开(公告)日：1995-05-19
申请号：JP29895893
申请日：1993-11-04
申请人： HITACHI LTD
发明人： MATSUI TAKAYUKI , TSUBOI TAKASHI , TOYODA EIICHI , HORIE SATORU , SAKATA KAZUHIRO , SAITO HIDEJI
IPC分类号： B60L9/16 , B60L15/32 , H02P5/46
摘要： PURPOSE:To prevent a train composed of a plurality of electric railcars coupled to be driven by one or more inverters from slipping or skidding by coupling the railcars by inverters and drive control means of the respective railcars via a communication network during a period in which the railcars pass a curved part, reducing torques of motors of the respective railcars and traveling at a constant speed. CONSTITUTION:A train is composed by coupling four electric railcars having AC motors 8a, 8b-11a, 11b to be driven by inverters 4-7. A communication network 3 is coupled between the inverters 4-7 of the railcars and cab controllers. Currents and speeds of the railcars are respectively detected by current detectors 15-19 and speed detectors 12a-15b, and input to the network 3. A cab controller 21 maintains a constant speed drive in which torques of the motors are reduced according to an operation command to be applied by a driver from a cab operating unit 20 until g head railcar enters bent part and he tail railcar passes through the part, and a limit speed command responsive to a.counted amount of the part is applied. suppress squeak.

6. 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.

7. 发明专利

JPH0690564A EQUIPMENT AND METHOD FOR CONTROLLING SERIES MULTIPLE INVERTER 失效
公开(公告)号：JPH0690564A
公开(公告)日：1994-03-29
申请号：JP23240691
申请日：1991-08-21
申请人： HITACHI LTD
发明人： ANDO TAKESHI , MATSUI TAKAYUKI , HORIE SATORU , SAITO HIDEJI , TOYODA EIICHI , SAKATA KAZUHIRO , NAKADA KIYOSHI
IPC分类号： H02M7/48 , H02M7/497 , H02M7/5387
摘要： PURPOSE:To obtain an appropriate PWM pulse by adding a zero-phase voltage command to a voltage command so that a PWM pulse of the minimum on-time or longer which is enough to discharge the electric charge of a capacitor may be supplied to a switching element. CONSTITUTION:A zero-phase voltage command arithmetic device 5 generates a zero phase voltage command Vn* so that it may change its polarity from positive to negative when a voltage command value of each phase of a three-phase ac voltage commands Vu*, Vv* and Vw* changes from positive to negative, and from negative to positive when negative to positive. Then, the zero-phase voltage command Vn* is added to the three-phase ac voltage commands Vu*, Vv* and Vw* and the obtained output voltage commands Vu**, Vv** and Vw** are compared with a carrier wave signal at a PWM pulse arithmetic device 3 and then a PWM pulse is generated. By this method, the output voltage command can skip over a region where a width of the carrier wave signal is small and a PWM pulse width of the minimum on-time of a switching element or longer cannot be obtained. The voltage across an output terminal of a series multiple inverter 1 is not influenced by the addition of the zero- phase voltage command Vn*.

8. 发明专利

JPH0670571A CONTROLLER FOR INVERTER DEVICE 失效
公开(公告)号：JPH0670571A
公开(公告)日：1994-03-11
申请号：JP22033392
申请日：1992-08-19
申请人： HITACHI LTD
发明人： MATSUI TAKAYUKI , HORIE SATORU , SAITO HIDEJI , OKUYAMA TOSHIAKI
IPC分类号： H02P21/00 , H02P27/04 , H02P5/408
摘要： PURPOSE:To make high-responce and high-accuracy torque control possible by a method wherein the output of current control, which controls an exciting component, is divided into the voltage command of the exciting component and the voltage command of a torque component to add them, in an AC induction motor, in which flux and current are controlled separately. CONSTITUTION:An AC induction motor, in which a DC power collected from a line through a pantograph 11 is converted into an AC voltage having a variable voltage and variable frequency by a PWM inverter 1 and is impressed on an AC motor 2 for driving an electric car, is equipped with a current controller 8, inputting an exciting current command Id*, an exciting current Id, a torque current Iq and a primary angular frequency command omega1*. The exciting current component of a rotary feild coordinate system is divided into a (d) axis voltage command and a (q) axis voltage command from a voltage command operator 5 in accordance with the primary angular frequency command omega1* or the rotating speed of the motor 2 to add them. In this case, when the output frequency of the inverter 1 is lower than a predetermined value, the exciting current component is added to the (d) axis voltage command but when the same is lower than the predetermined value, the exciting current component is added to the (q) axis voltage command.

9. 发明专利

JPH04322453A BOILING AND COOLING APPARATUS 失效
公开(公告)号：JPH04322453A
公开(公告)日：1992-11-12
申请号：JP9194491
申请日：1991-04-23
申请人： HITACHI LTD , HITACHI MITO ENG KK
发明人： SAITO KIYOSHI , SAITO HIDEJI
IPC分类号： H01L23/427
摘要： PURPOSE:To prevent steam from being diffused to the lower part of an evaporation container and to enhance the cooling performance of the title apparatus by a method wherein a steam reservoir is installed at the upper part of the evaporation container. CONSTITUTION:A steam reservoir 26 is installed at the upper part of an evaporation container 1. A flange at an insulting joint 3 connected to it is formed as an oval shape. While the inside cross section of the insulting joint 3 is being changed from the oval shape to a circular shape, the joint is connected to a bellows 4 via a circular flange. A partition plate is installed in an interruption tank 6 connected to it; the interruption tank 6 is divided into an evaporation chamber 14 and a liquid chamber 15. Thereby, the return of a coolant is made smooth, the performance of a boiling and cooling apparatus is enhanced, and the capacity of the apparatus can be made large.

10. 发明专利

JPH0447522B2 失效
公开(公告)号：JPH0447522B2
公开(公告)日：1992-08-04
申请号：JP26118385
申请日：1985-11-22
申请人： HITACHI LTD
发明人： SAITO HIDEJI , HORIE SATORU , USUI YOSHINORI , ITAHANA HIROSHI
IPC分类号： B60L3/00

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