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1. 发明专利

JPH0241663A VARIABLE DC POWER EQUIPMENT 失效
公开(公告)号：JPH0241663A
公开(公告)日：1990-02-09
申请号：JP18843688
申请日：1988-07-29
申请人： HITACHI LTD
发明人： OO NORIO , YAMANOBE MASAYUKI
IPC分类号： H02M7/08 , H02M3/28 , H02M3/335 , H02M7/12
摘要： PURPOSE:To reduce the content of a ripple, and to improve accuracy by composing the title power equipment of a transformer, in which a plurality of phase are changed, a full-wave rectifier and a smoothing circuit and controlling voltage frequency by the deviation output of a feedback signal and a current voltage command value. CONSTITUTION:A variable DC power equipment consists of a converter 2 converting the AC power of a commercial power supply 1 into DC power, a smoothing capacitor 3, a high-frequency inverter 4, a transformer 5 charging the phase of the sine wave output of the inverter 4, a full-wave rectifier 6 and a smoothing device 7. A DC reactor 9 reducing a ripple and a current detector 12 are installed to the smoothing device 7. The command of a current command setter 13 is compared with the feedback signal of the current detector 12, and the high-frequency inverter 4 is driven through an automatic current regulator 11 by the deviation signal of the command and the feedback signal. The rectifier 6 conducts full-wave rectification together with a sine wave form displaced at 30 deg., and used as a variable DC power supply through the smoothing device 7, thus supplying load 8 with the deviation signal.

2. 发明专利

JP2002044980A SPEED CONTROL DEVICE FOR INDUCTION MOTOR 失效
公开(公告)号：JP2002044980A
公开(公告)日：2002-02-08
申请号：JP2000229054
申请日：2000-07-25
申请人： HITACHI LTD
发明人： AKITA YOSHITOSHI , OKUYAMA TOSHIAKI , NEMOTO JIRO , OO NORIO
IPC分类号： H02P23/00 , H02P21/22 , H02P23/07 , H02P23/16 , H02P25/16 , H02P27/05 , H02P5/28
摘要： PROBLEM TO BE SOLVED: To provide a speed control device for an induction motor which is made compact and at a low cost. SOLUTION: In the speed control device which connects a self-extinguish element 4 via a DC reactor 15 between output terminals of a converter 3, which is connected to the secondary side of the induction motor 2 and on-off controls the self-extinguish element 4 so as to control the output voltage of the converter 3, and a capacitor 16 is connected in parallel with the serial circuit of the self-extinguish element 4 and the DC reactor 15.

3. 发明专利

JPS63294293A INVERTER CONTROL DEVICE 失效
公开(公告)号：JPS63294293A
公开(公告)日：1988-11-30
申请号：JP12820687
申请日：1987-05-27
申请人： HITACHI LTD
发明人： OO NORIO
IPC分类号： H02P3/18 , H02P27/06
摘要： PURPOSE:To perform smooth speed control in natural deceleration by a load or a machine, by inserting a regeneration blocking diode capable of changing over the direction in normal and reverse rotations. CONSTITUTION:A regeneration blocking diode in normal rotation 12 and a regeneration blocking diode in reverse rotation 13 are provided. In normal deceleration, the command value of a speed setter 16 is smaller than the feedback signal of a speed detector 9, where the output of a speed regulator 15 is blocked with the regeneration blocking diode in normal rotation 12 and no speed deviation command is issued to a vector control circuit 11. On this account, in deceleration, no regenerative current of an induction motor 8 flows to DC side through an inverter transistor 6 and the DC side is prevented from getting to overvoltage. The speed of the induction motor 8 is naturally decelerated by the load and stopped. In reverse deceleration, it is controlled in the same way.

4. 发明专利

JP2000333492A DRIVER FOR AC MOTOR 失效
公开(公告)号：JP2000333492A
公开(公告)日：2000-11-30
申请号：JP14178499
申请日：1999-05-21
申请人： HITACHI LTD
发明人： TACHIKAWA MAKOTO , CHIBA HIROSHI , OO NORIO
IPC分类号： H02J3/00 , H02J3/01 , H02P1/28 , H02P23/00 , H02P27/06 , H02P7/36 , H02P7/63
摘要： PROBLEM TO BE SOLVED: To reduce the size and cost of a driver for AC motor by employing an AC reactor serving to suppress both harmonies and starting current, thereby decreasing the number of AC reactors. SOLUTION: While an AC motor 5 is driven through a power converter 1 with variable speed, an AC reactor 6 is connected between the power converter 1 and an AC power supply 8 in order to suppress harmonics generated through switching of the power converter 1. When an overcurrent flows through a PWM inverter 4 to cause a failure, rotational speed of the AC motor 5 goes to 0, and a restricted starting current flows from the AC power supply 8 to the AC motor 5 via the AC reactor 6. Since a single AC reactor 6 can serve to suppress both harmonics and starting current, the size and cost of the driver for AC motor can be reduced.

5. 发明专利

JPS62114492A CONTROLLER FOR INVERTER 失效
公开(公告)号：JPS62114492A
公开(公告)日：1987-05-26
申请号：JP25222585
申请日：1985-11-11
申请人： HITACHI LTD
发明人： OO NORIO
IPC分类号： H02P27/06 , H02M7/48
摘要： PURPOSE:To discharge the charges of a smoothing capacitor positively by the simple constitution of a device at the time of a shutdown or at the time of power interruption on abnormality by fitting a normally closed contact interlocked with an interlocking device to a discharging circuit. CONSTITUTION:An AC electromagnetic contactor 4 and a DC electromagnetic contactor 6 are brought to a closed state at the time of power interruption and at the time of the abnormality of interlocks 16, 17, and the supply of energy from an AC power supply 1 is interrupted. A driving power for a base drive circuit 11 is removed at the same time and the circuit 11 cannot be operated. Accordingly, a smoothing-capacitor residual-charge discharging circuit constituted of passive closed contacts for the AC electromagnetic contactor 4 and the DC electromagnetic contactor 6 and a smoothing-capacitor residual-charge consumption resistor 8 is mounted in order to discharge charges remaining in a smoothing capacitor 9 on power interruption and on abnormality.

6. 发明专利

JP2002027789A VELOCITY CONTROLLER OF INDUCTION MOTOR 失效
公开(公告)号：JP2002027789A
公开(公告)日：2002-01-25
申请号：JP2000203044
申请日：2000-06-30
申请人： HITACHI LTD
发明人： AKITA YOSHITOSHI , OKUYAMA TOSHIAKI , NEMOTO JIRO , OO NORIO
IPC分类号： H02P23/00 , H02P21/05 , H02P21/22 , H02P23/04 , H02P23/07 , H02P27/05 , H02P7/635
摘要： PROBLEM TO BE SOLVED: To provide a velocity controller of an induction motor which can control the flicker without any additional device. SOLUTION: A primary current of an induction motor 2 is detected with a current detector 14, a flicker element is extracted from the primary current detection signal with a flicker detection circuit 26, and an output current of a reverse converter 10 is controlled to make zero the flicker element with a flicker suppresor controller 27.

7. 发明专利

JPH11155296A POWER TRANSDUCER 失效
公开(公告)号：JPH11155296A
公开(公告)日：1999-06-08
申请号：JP32269597
申请日：1997-11-25
申请人： HITACHI LTD
发明人： OKAMATSU SHIGETOSHI , OO NORIO , TACHIKAWA MAKOTO
IPC分类号： H02P3/18 , H02P21/22 , H02P23/00 , H02P23/07 , H02P23/16 , H02P27/04 , H02P27/05 , H02P5/415
摘要： PROBLEM TO BE SOLVED: To suppress an increase in the input voltage of a regenerative converter on power recovery by stopping operation of a first switching element and the regenerative converter on the power failure of a main power supply, and at the same time by turning off a second switching element until the output voltage of a rectifier is set after the power recovery. SOLUTION: A main supply voltage being detected by a transformer 14 for detecting the main supply voltage is inputted into a rectifier REC, thus resulting in an output v1. When the v1 becomes lower than the partial pressure voltage of resistors R1 and R2, a comparator COMP changes an output v2 from H to L level. Since a monomulti MULT generates an L-level voltage with a specific time width at a leading edge of the v2, an output v3 of an AND gate AND is set to L level only for a specific period during power failure and power recovery. Also, the output v3 is connected as the stop signal of a chopper-controlling device 15 and a converter-controlling device 17, and becomes the gate signal of an IGBT6 via an insulation amplifier I-AMP and an on/off-controlling device 19.

8. 发明专利

JP2000262064A PROTECTIVE APPARATUS FOR HIGH-VOLTAGE MULTI-INVERTER 失效
公开(公告)号：JP2000262064A
公开(公告)日：2000-09-22
申请号：JP6269999
申请日：1999-03-10
申请人： HITACHI LTD
发明人： OKAMATSU SHIGETOSHI , OO NORIO
IPC分类号： H02M7/48 , H02M7/497
摘要： PROBLEM TO BE SOLVED: To attain cost reduction by inserting an AC current detector in only one phase of three-phase input of a transformer, thereby detecting short-circuit failure in a secondary circuit. SOLUTION: If two phases corresponding to the input power supply of a control circuit 54 of an inverter transistor in respective single-phase inverters are short-circuited, a power supply voltage drop detector 55 inside it comes into action and a breaker 2 is tripped through a logical sum element 72 from a logical sum element 73. If the short-circuit exists between one phase other than two phases corresponding to the input power supply of the control circuit 54 of the inverter transistor and other one phase, over-current appears, due to an influence of secondary short-circuit, in the phase in which an AC detector 3 mounted on the primary side of a transformer 4 is inserted. As a result, even in the case of small input current in which an AC motor is variably driven at a low speed, secondary short-circuit can be detected by setting a detection level to a constant increase rate relative to a normal current value to be passed. Therefore, only one AC detector on the primary side of the transformer may be only added.

9. 发明专利

JPS6190067A Testing device for dc electric motor 失效
标题翻译：直流电机测试装置
公开(公告)号：JPS6190067A
公开(公告)日：1986-05-08
申请号：JP21134984
申请日：1984-10-11
申请人： Hitachi Ltd
发明人： OO NORIO
IPC分类号： G01R31/34
摘要： PURPOSE: To prevent a decrease in operation efficiency due to the overoutput or overvoltage trip of an electric motor by providing a torque setter for setting the current of a boosting thyristor, a speed setter for setting the speed of a testing machine, etc.
CONSTITUTION: A load torque current is flowed to the boosting thyristor 3, electric motor 5, generator 4, etc., under the command of the torque setter 14. In this case, the generator 4 and electric motor 5 are reciprocal and enter a lock state. The command of the speed setter 18 is controlled by a speed controller 13 so that the deviation of the quantity of feedback of a speed detector 11 coupled directly with a track wheel 10 is zero. A speed deviation command, on the other hand, controls the current of a main thyristor 6 so that the deviation from the feedback of a current detector 2 is zero. Then, an acceleration current flows to the generator 4 through a thyristor 6 according to the command of the setter 18 to generate a torque difference between the generator 4 and electric motor 5, thereby accelerating the testing machine. Thus, the quantity of torque and the speed are set by the setters 14 and 18 individually.
COPYRIGHT: (C)1986,JPO&Japio
摘要翻译：目的：通过设置用于设置升压晶闸管的电流的转矩设定器，用于设定试验机的速度等的速度设定器，防止由于电动机的过度输出或过电压跳闸引起的运行效率的降低。构成：负载转矩电流在转矩设定器14的指令下流向升压晶闸管3，电动马达5，发电机4等。在这种情况下，发电机4和电动机5是倒数并进入锁定状态。速度设定器18的指令由速度控制器13控制，使得与履带轮10直接连接的速度检测器11的反馈量的偏差为零。另一方面，速度偏差指令控制主晶闸管6的电流，使得与电流检测器2的反馈的偏差为零。然后，加速电流根据设定器18的指令通过晶闸管6流向发电机4，以产生发电机4与电动机5之间的转矩差，从而加速试验机。因此，设定器14和18分别设定扭矩量和速度。

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