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1. 发明专利

JP2000197396A CONTROLLER FOR SYNCHRONOUS MOTOR 失效
公开(公告)号：JP2000197396A
公开(公告)日：2000-07-14
申请号：JP37281698
申请日：1998-12-28
申请人： HITACHI LTD
发明人： AKITA YOSHITOSHI , OKUYAMA TOSHIAKI , IWAJI YOSHINAO , TAKAHASHI JUNICHI , TOMINO YOJI , SAKEGAWA TAKASHI
IPC分类号： H02P27/04 , H02P21/00 , H02P21/22 , H02P23/12 , H02P23/16
摘要： PROBLEM TO BE SOLVED: To stabilize operation of a synchronous motor by operating the limit (upper limit) value of torque current satisfying stability conditions previously based on a field current detection value and limiting a torque current command value with the limit value. SOLUTION: A limiter value operating unit 19 is provided with the output from a field current detector 14, i.e., a field current value, and then a limiter value is operated based on a field current detection value and outputted. More specifically, a limit value of torque current command value is operated based on the magnitude of field current. Malfunction, e.g. step out, can thereby be eliminated and the motor can be operated stably at all times. Even when the field current drops abruptly down to zero due to abnormality of a field converter, the load angle δ does not exceed 90 deg. to cause instability and the torque current can be decreased quickly while sustaining a stabilized state.

2. 发明专利

JPH1042569A CONTROLLER FOR OUTPUT OF PULSE WIDTH MODULATION CONVERTER 失效
公开(公告)号：JPH1042569A
公开(公告)日：1998-02-13
申请号：JP19307396
申请日：1996-07-23
申请人： HITACHI LTD
发明人： IWAJI YOSHINAO , OKUYAMA TOSHIAKI
IPC分类号： G01R21/133 , H02M7/48 , H02P27/06 , H02P5/41
摘要： PROBLEM TO BE SOLVED: To enhance the responsiveness of an entire control system, even if a large amount of ripple components is contained in a detected value, by adding up the present sample value and a sample value in the past in the specified synchronous pulse width modulation period. SOLUTION: A sample signal is generated in a sample signal generator 13 and is output to a sample hold device 12. The sample hold device 12 samples a value from a current detector 4 and holds the value. The value of current is sampled in the sample hold device 12 four times in the half period of carrier frequency and is read to a microcomputer 15. In order to cancel the ripple components contained in these current sample values, the values of the four samples in the past, including the present detected value, are averaged. A value obtained as the result of this current detected value compensation is used for control arithmetic operation as a new current detected value. A voltage command value obtained in a current controller 152 is outputted to a pulse width modulation controller 16, which controls a power converter 2.

3. 发明专利

JP2000060196A CONTROLLER FOR POWER CONVERTER 失效
公开(公告)号：JP2000060196A
公开(公告)日：2000-02-25
申请号：JP22562098
申请日：1998-08-10
申请人： HITACHI LTD
发明人： IWAJI YOSHINAO , OKUYAMA TOSHIAKI , TAKAHASHI JUNICHI , AKITA YOSHITOSHI
IPC分类号： H02P27/04 , H02P21/00 , H02P21/22 , H02P23/07 , H02P23/16 , H02P27/08
摘要： PROBLEM TO BE SOLVED: To prevent the occurrence of phase shift, the drop in torque and excess current by limiting the AC voltage commands of all phases with the same rate and changing the output value of an AC voltage limitter, when the phase voltage of one of AC voltage commands exceeds a prescribed value that is previously set. SOLUTION: An AC voltage command computing element 1 reads the rotation speed command and the rotation speed of an induction motor 8 and the value of current flowing in an induction motor 8, operates AC voltage commands Vu0, Vv0 and Vw0 based on the values and outputs them to a zero-phase adder 2. The zero-phase adder 2 outputs voltage commands Vu1, Vv1 and Vw1, to which zero-phases are added, to an AC voltage limitter 3. The AC voltage limitter 3 limits all the voltage commands Vu1, Vv1 and Vw1 with the same rate, when the phase voltage of one of voltage commands Vu1, Vv1 and Vw1 exceeds prescribed value and cauges the output values of Vu2, Vv2 and Vw2 to be changed.

4. 发明专利

JPH11164569A THYRISTOR CONVERTER 失效
公开(公告)号：JPH11164569A
公开(公告)日：1999-06-18
申请号：JP32985597
申请日：1997-12-01
申请人： HITACHI LTD
发明人： IWAJI YOSHINAO , OKUYAMA TOSHIAKI
IPC分类号： H02M7/48 , H02M7/497 , H02M7/5387
摘要： PROBLEM TO BE SOLVED: To provide a thyristor converter which is capable of materializing high power factor. SOLUTION: This system is equipped with a thyristor converter 4 which receives the input of a DC power and outputs on AC power to a three-phase AC power source 1, and a single-phase AC power source 7 which adds the AC voltage the frequency of which is six times the frequency of the three-phase AC power source 1 and moreover the phase of which substantially accords with the phase of the three-phase AC power source 1 with the input end of the thyristor converter 4.

5. 发明专利

JPH09201056A POWER CONVERTER SYSTEM 失效
公开(公告)号：JPH09201056A
公开(公告)日：1997-07-31
申请号：JP2311896
申请日：1996-01-16
申请人： HITACHI LTD
发明人： IWAJI YOSHINAO , OKUYAMA TOSHIAKI , IKIMI TAKASHI , TOBIYO MASAHIRO
IPC分类号： H02J3/38 , H02J3/01 , H02M1/12 , H02M3/28 , H02M7/12 , H02M7/155 , H02M7/17 , H02M7/493 , H02M7/48
摘要： PROBLEM TO BE SOLVED: To suppress harmonics which flow out when a plurality of converters are dispersedly arranged by detecting the phase of the electric power supplied from power systems at every power converter and generating a triangular-wave carrier by synchronizing the carrier to the power phase and, at the same time, arbitrarily setting the phase of the carrier. SOLUTION: A command value generator 4 computes a voltage command and outputs the command aiming at the electric power required for a load device 10 and with the purpose of making the power factor of a converter 71 to '1'. A power phase detector 8 detects the phase of electric power and a phase command generator 9 generates a synchronous signal so as to synchronize a triangular-wave signal to the phase of supplied electric power. A triangular wave generator 52 generates the triangular-wave carrier based on the phase command from the phase command generator 9 and a PWM controller 5 generates a PWM pulse by comparing the carrier with the output signal of the command value generator 4. Thus the phase of the triangular-wave carrier of each converter is set by giving a power phase detecting function to each converter and realizing power supply synchronizing PWM in each converter.

6. 发明专利

JPH11305803A CONTROLLER 失效
公开(公告)号：JPH11305803A
公开(公告)日：1999-11-05
申请号：JP11459198
申请日：1998-04-24
申请人： HITACHI LTD
发明人： MOROOKA YASUO , INABA HIROMI , NAKAHARA TAKASHI , OKADA TAKASHI , TOBIYO MASAHIRO , IWAJI YOSHINAO
IPC分类号： B21B37/00 , B21B37/58 , G05B13/02 , G05B13/04 , G05B19/19 , H02P25/098 , H02P29/00 , H02P5/00
摘要： PROBLEM TO BE SOLVED: To exclude any constraint on the responding performance of each control system, to clarify a physical phenomenal relation between each controller and the state variable of an object to be controlled, and to simplify adjustment by applying a prescribed response function previously decided by a designer for plural control systems to the object to be controlled, and designing a controller in each control system. SOLUTION: This is a controller for deciding the control arithmetic function of a controller from a transfer function 1 of an object to be controlled, and adjusting the manipulated variable of the object to be controlled according to the decided control arithmetic function. In this case, the control arithmetic function of a first controller 2 is decided so that a closed loop/open loop transfer function or a closed loop transfer function in a control system including the object to be controlled and the first controller 2 can be made coincident with a previously decided first transfer function, and the control arithmetic function of a second controller 3 is decided so that a transfer function up to a state variable at a point at which disturbance is impressed to the object to be controlled can be made coincident with a previously decided second transfer function for a closed loop control system constituted of the controller and the first controller 2. Then, the sum signal of the outputs of the first and second controllers 2 and 3 can be obtained as the manipulated variable of the object to be controlled.

7. 发明专利

JPH11299243A POWER CONVERTING APPARATUS WITH NO HIGHER-HARMONICS 失效
公开(公告)号：JPH11299243A
公开(公告)日：1999-10-29
申请号：JP10434698
申请日：1998-04-15
申请人： HITACHI LTD
发明人： IWAJI YOSHINAO , OKUYAMA TOSHIAKI
IPC分类号： H02J3/01 , H02M1/12 , H02M7/12 , H02M7/217
摘要： PROBLEM TO BE SOLVED: To obtain a power converting apparatus wherein the value of its power factor is equal to 1 and its higher harmonics can be suppressed, by so controlling two power converters that the waveforms of their output DC currents become analogous to the specific waveforms repeated alternately within a specific range. SOLUTION: Diode rectifiers 4, 4' are connected with the secondary sides of transformers 2, 3 whose primary sides are connected with a three-phase AC power supply 1, and the rectifiers 4, 4' are connected in series. As the transformer 2 is of Δ-Δ connection type and the transformers 3 is of Δ-Y connection type, a secondary side voltage has a phase difference of 30 deg. compared with a primary side voltage. Further, output voltage Vrec1, Vrec2 of the diode rectifiers include respectively the ripple components six times the power supply frequency, and DC voltage is fed to a load device 6 through the ripple reductions performed by smoothing capacitors 5, 5'. Moreover, controlling the output voltages of single-phase AC power supplies 7, 8, output currents Irec1, Irec2 of the respective rectifiers are so controlled as to repeat alternately their waveforms of x=0-30 deg. and x=150-180 deg. when f(x) represents sin x, As a result, the higher-harmonics of a power converting apparatus can be made zero in principle and a power factor of 1 is realized.

8. 发明专利

JPH1198900A CURRENT CONTROLLER FOR POWER CONVERTER 失效
公开(公告)号：JPH1198900A
公开(公告)日：1999-04-09
申请号：JP25645297
申请日：1997-09-22
申请人： HITACHI LTD
发明人： IWAJI YOSHINAO , OKUYAMA TOSHIAKI
IPC分类号： H02M7/48 , H02P21/00 , H02P21/22 , H02P23/07 , H02P23/16 , H02P27/04 , H02P27/08
摘要： PROBLEM TO BE SOLVED: To realize high response control of an AC load by adding the difference between the current command value and the actual value an AC amount at the d-axis or the q-axis of rotary coordinate to the q-axis or d-axis through a cross controller and subjecting the cross controller to differential or incomplete differential compensation. SOLUTION: A speed controller 9 reads in a speed command ωr* of an induction motor 5 and an actual speed ωr detected by a speed detector 6 and operates current commands i1d*, i1q*. A PI controller proportionally integrates the difference between a speed command ωr* and the actual speed ωr to produce a torque current command i1q* and an exciting current command setter sets an exciting current command i1d*. A current controller 12 operates the voltage command for the induction motor 5 from the current command values i1d*, i1q* and current detection values i1d, i1q and a noninterference compensator 13 operates an interference voltage value between d-axis and q-axis based the current value. It is added to the output from a voltage controller 12 to produce the voltage commands v1d*, v1q* of d-axis and q-axis and an AC voltage is applied from a PWM converter 2 to the induction motor 5 thus driving the induction motor 5.

9. 发明专利

JP2005341799A Speed-regulating device of induction machine 审中-公开
标题翻译：感应电机调速装置
公开(公告)号：JP2005341799A
公开(公告)日：2005-12-08
申请号：JP2005246900
申请日：2005-08-29
申请人： Hitachi Ltd , 株式会社日立製作所
发明人： AKITA YOSHITOSHI , OKUYAMA TOSHIAKI , IWAJI YOSHINAO , SUGIYAMA SHIGERU
IPC分类号： H02P23/00 , H02P5/46 , H02P27/05 , H02P5/415
摘要： PROBLEM TO BE SOLVED: To provide the speed-regulating device of the induction machine, each of which can independently control the speed of a plurality sets of the induction motors, and further can generate tendency in compactness of thd device, and which can reduce the cost. SOLUTION: Switching elements 4a, 4b, 4c are respectively connected between DC output terminals of electronic power rectifiers 3a, 3b, 3c connected to the secondary side of a plurality of sets of induction machines 2a, 2b, 2c, speed control means 8a, 8b, 8c for on/off-controlling the switching elements, in order to control the output current of the power rectifier, according to the deviation between the detected value of the rotational speed and its command value of the induction machine are respectively constituted, relating to the plurality sets of the induction machines; a common capacitor 9 is connected via diodes 5a, 5b, 5c, in parallel with each switching element; and additionally, the diode is connected in a direction of guiding the output current of the power rectifier to the capacitor, when the operation of the switching element is turned off, and further, a power inverter 10 is connected between the terminals of the capacitor, to regenerate secondary power in an AC power source 1. COPYRIGHT: (C)2006,JPO&NCIPI
摘要翻译：要解决的问题：为了提供感应电动机的调速装置，其可以独立地控制多组感应电动机的速度，并且还可以产生装置的紧凑性的趋势，以及哪些可以降低成本。解决方案：开关元件4a，4b，4c分别连接在与多组感应电动机2a，2b，2c连接的二次侧的电力整流器3a，3b，3c的直流输出端子之间，速度控制装置 8a，8b，8c，用于对开关元件进行开/关控制，以便根据转速的检测值与感应电机的指令值之间的偏差分别构成控制功率整流器的输出电流涉及多组感应电机; 公共电容器9经由二极管5a，5b，5c与各开关元件并联连接; 此外，当切换元件的动作关闭时，二极管在将功率整流器的输出电流引导到电容器的方向上连接，而且电力逆变器10连接在电容器的端子之间，在AC电源1中再生二次电源。版权所有（C）2006年，JPO＆NCIPI

10. 发明专利

JP2001238455A MULTIPLE POWER CONVERTER 失效
公开(公告)号：JP2001238455A
公开(公告)日：2001-08-31
申请号：JP2000050462
申请日：2000-02-22
申请人： HITACHI LTD
发明人： IWAJI YOSHINAO , OKUYAMA TOSHIAKI , NAGATA KOICHIRO , OKAMATSU SHIGETOSHI
IPC分类号： H02M7/493 , H02M7/48
摘要： PROBLEM TO BE SOLVED: To realize regenerative operation of a load apparatus to be driven with a multiple power converter through the addition of only a small number of parts and control, without having to increase the size of the apparatus. SOLUTION: A multiple power converter comprises a multiple power converter 3 of single phase through serial connection of a plurality units of inverter 4 and AC side, and drives a three-phase induction motor 6 with an three-phase AC outputted from connections of a plurality of multiple power converter. A unit inverter 5 of multiple power converter of each phase is provided with a damping resistance unit 51 to process the regenerative energy from a motor, a motor application voltage calculator, a regeneration on/off discriminator, a switching signal generator, a regenerative torque current zero setter, and a regenerative torque current instruction generator, are provided as a controller 8. A terminal voltage of the motor is measured or estimated simultaneously, when deceleration of motor is started when decelerating or stopping of the operation of rotating motor is conducted. When the terminal voltage is lowered from the preset value, the motor is broke regeneratively and stopped.

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