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11. 发明专利

JP2001231269A BIASED MAGNETIZATION SUPPRESSION-CONTROLLING DEVICE 失效
公开(公告)号：JP2001231269A
公开(公告)日：2001-08-24
申请号：JP2000045113
申请日：2000-02-17
申请人： HITACHI LTD
发明人： NAGATA KOICHIRO , OKUYAMA TOSHIAKI , IWAJI YOSHINAO , OKAMATSU SHIGETOSHI , KUNII KEIJI
IPC分类号： H02M7/12 , H02M7/537
摘要： PROBLEM TO BE SOLVED: To simplify a configuration, to increase sensitivity to an inrush current due to biased magnetization and at the same time to reduce the influence of DC deviation caused by the drift of a current detection value. SOLUTION: A power rectifier or an inverter that is connected to a transformer, and a biased magnetization suppression-controlling device that calculates the AC I/O voltage of the power rectifier or inverter are provided with a voltage command generation, pulse generation, voltage command correction value generation, and voltage command correction parts 11, 12, 13, and 14. In this case, the voltage command generation part 11 detects current at the primary or secondary side of the transformer, and generates an AC voltage command v* based on a speed command, the pulse generation part 12 determines a period for integrating a detection current based on the AC voltage command, the voltage command correction value generation part 13 integrates (1/s) the detection current only for the period that is prescribed by a pulse, and the voltage command correction part 14 corrects the AC voltage command according to a voltage command correction value. When the period for integrating the detection current is set to the zero-cross point of an AC phase voltage command value for integrating the detection current for integrating the detection current, the integration completion value of a period is used as the initial value of the next integration period for generating a voltage command correction value v**.

12. 发明专利

JPH08149855A CONTROL METHOD AND CONTROLLER FOR POWER CONVETER 失效
公开(公告)号：JPH08149855A
公开(公告)日：1996-06-07
申请号：JP28312094
申请日：1994-11-17
申请人： HITACHI LTD
发明人： OKUYAMA TOSHIAKI , IKIMI TAKASHI , IWAJI YOSHINAO
IPC分类号： H02M7/48 , H02M7/72 , H02P27/06 , H02P5/41
摘要： PURPOSE: To compensate the response delay of a DC current and minimize the ripple of DC voltage so as to use a smoothing capacitor of smaller value by quickening the response control from the current controller of the converter performing normal conversion to the current ripple on the DC side of the converter performing reverse conversion, more than the current controller of the converter. CONSTITUTION: A smoothing capacitor 6 is connected between the terminals of a converters 1 and 4, and both converters 1 and 4 are controlled by current controllers 10 and 15 which control several AC currents. The response control from the current controller 10 of the converter 1 performing normal conversion to the current ripple on AC side of the converter 4 performing reverse conversion is quickened more than the current controller 15 of the converter 4 performing reverse conversion. Hereby, the AC current of the converter performing normal conversion is controlled prior to that of the converter 4 performing reverse conversion. Accordingly, the response delay of the DC current is compensated, and the DC voltage ripple is minimized, whereby the capacity of the smoothing capacitor 6 can be reduced.

13. 发明专利

JPH07115799A CONTROL METHOD FOR INDUCTION MOTOR 失效
公开(公告)号：JPH07115799A
公开(公告)日：1995-05-02
申请号：JP25802293
申请日：1993-10-15
申请人： HITACHI LTD
发明人： OKUYAMA TOSHIAKI , IWAJI YOSHINAO , IKIMI TAKASHI
IPC分类号： H02P27/04 , H02P21/00 , H02P21/04 , H02P21/14 , H02P21/16 , H02P21/18 , H02P21/20 , H02P21/22 , H02P21/24 , H02P21/34 , H02P23/03 , H02P23/07 , H02P23/08 , H02P23/14 , H02P23/16 , H02P23/18 , H02P23/20 , H02P27/08
摘要： PURPOSE:To enable highly accurate control on position, speed and torque, including those in proximity to 0 deg., by estimating magnetic flux position from inductance based on a phenomenon in which inductance varies depending on the positional relation between winding and motor magnetic flux. CONSTITUTION:A.c. voltage is superposed on an output voltage command value of an inverter 1. The motor 2 current component that flows according to the result of the superposition is detected using a current component detector 7, and leakage inductance of the motor 2 winding is determined from the A.c. voltage and current. Then magnetic flux position (rotational angle) phi1 is estimated from inductance using a phenomenon in which inductance varies depending on the positional relation between the motor 2 winding and the motor 2 magnetic flux. The phase of the inverter 1 output voltage and the exciting component and torque component (equivalent to secondary current) of the motor 2 current, are controlled according to the estimated magnetic flux angle phi1. This makes possible highly accurate control on position, speed and torque, including those in proximity to zero speed.

14. 发明专利

JPH06315291A COMPUTING METHOD FOR POSITION OF MAGNETIC FLUX OF INDUCTION MOTOR, AND ITS CONTROL METHOD USING THE SAME 失效
公开(公告)号：JPH06315291A
公开(公告)日：1994-11-08
申请号：JP10215593
申请日：1993-04-28
申请人： HITACHI LTD
发明人： OKUYAMA TOSHIAKI , IWAJI YOSHINAO , IKIMI TAKASHI
IPC分类号： H02P21/00 , H02P21/18 , H02P21/22 , H02P21/24 , H02P23/07 , H02P23/08 , H02P23/16 , H02P27/04 , H02P27/08 , H02P5/408
摘要： PURPOSE:To perform a highly accurate speed-control of an induction motor inclusively of the region adjacent to zero-speed, by superimposing on the driving voltage of the motor an AC voltage having a different frequency from its frequency, and by measuring an inductance of the motor based on the current of the motor and the AC voltage, and further, by computing the position of the magnetic flux of the motor based on the inductance. CONSTITUTION:On the command value of the output voltage of an inverter 1, a sine wave AC voltage is superimposed, and the components of the current of a motor 2 which flows responding to the sine wave AC voltage through the winding of the motor 2 are sensed respectively, and further, from the AC voltage and the current the leakage inductance of the winding of the motor 2 is measured. Then, based on the phenomenon wherein the leakage inductance is varied by the positional relation between the winding and the magnetic flux of the motor 2, the position (rotational angle) of the magnetic flux is estimated. Using this estimated magnetic flux as a reference, the phase of the output voltage of the inverter 1 is controlled, and in its turn, an excitation current i1d and a torque current i1q of the motor 2 (the latter corresponds to its secondary current) are controlled. Thereby, the highly accurate speed-control of the motor 2 can be performed inclusively of the region adjacent to zero-speed.

15. 发明专利

JP2000197398A CONTROLLER FOR SYNCHRONOUS MOTOR 失效
公开(公告)号：JP2000197398A
公开(公告)日：2000-07-14
申请号：JP37282098
申请日：1998-12-28
申请人： HITACHI LTD
发明人： IWAJI YOSHINAO , OKUYAMA TOSHIAKI , AKITA YOSHITOSHI , TAKAHASHI JUNICHI
IPC分类号： H02P27/04 , H02P21/00 , H02P21/22 , H02P23/12 , H02P23/16
摘要： PROBLEM TO BE SOLVED: To enhance responsiveness by subjecting a field current command to feedforward compensation (hereinafter referred to F.F. compensation) using at least, one of a torque current command, a torque current detection value, a flux command or a flux detection value thereby suppressing transient fluctuation of flux. SOLUTION: Based on the difference between a flux command Φ* and a detection value Φc, a magnetomotive force current command operating unit 141 produces a required magnetomotive force current command IΦ* through a compensator, e.g. a proportional integration compensator. A field current command operating unit operates a field current command based on the IΦ*. In this regard, an If* is varied directly from a torque current command IT* and the Φ* by providing a flux command with a compensation gain 143 for F.F. and an F.F. compensation gain 144 for the field current command. Since a required If* is applied to a field current controller without waiting fluctuation of flux, fluctuation of flux can be suppressed significantly.

16. 发明专利

JP2000197397A CONTROLLER FOR SYNCHRONOUS MOTOR 失效
公开(公告)号：JP2000197397A
公开(公告)日：2000-07-14
申请号：JP37281998
申请日：1998-12-28
申请人： HITACHI LTD
发明人： IWAJI YOSHINAO , OKUYAMA TOSHIAKI , AKITA YOSHITOSHI , TAKAHASHI JUNICHI
IPC分类号： H02P21/00 , H02P21/22 , H02P23/12 , H02P23/16 , H02P27/04
摘要： PROBLEM TO BE SOLVED: To recover a stable region quickly when the load angle enters into an instable region by making a decision that the limit of stable operation is reached when the load angle exceeds a preset value and then increasing the field current. SOLUTION: Load angle (hereinafter referred to δc is monitored at parts number 20, for example, and an F signal is switched from 0 to 1 instantaneously when a set value δ on is exceeded. Absolute value of δc is operated and used for determining the switching time so that it can be used as it is even during recovery. In order to prevent chattering of an F signal in the vicinity of δon, a hysteresis comparator 202 is employed. A level for resetting the F signal is set by the value of δ off. A switch 18 is normally turned to '0' side and switched to '1' when the F signal outputted from the comparator 202 is 1 thus making a switching to the maximum value of an If* field converter. A setter 19 sets a maximum value for the field converter or the field circuit of a motor.

17. 发明专利

JPH10295080A THYRISTOR CONVERTOR 失效
公开(公告)号：JPH10295080A
公开(公告)日：1998-11-04
申请号：JP10003197
申请日：1997-04-17
申请人： HITACHI LTD
发明人： IWAJI YOSHINAO , OKUYAMA TOSHIAKI
IPC分类号： H02M7/162 , H02M1/12 , H02M7/12 , H02M7/17
摘要： PROBLEM TO BE SOLVED: To reduce harmonic components, which are generated in the input current of a thyristor converter and which are expressed by a specific expression by providing a single-phase AC power supply by which either an AC voltage or an AC current whose frequency is at a specified multiple of the frequency of a three-phase AC power supply is applied to the output end of the thyristor converter. SOLUTION: The waveform of the output voltage of a single-phase AC power supply 7 is a square wave, whose frequency is six times the frequency of input voltages of thyristor converters 4, 4', and its peak value is set at a prescribed value. When the voltage at the square wave is applied to output voltages of the thyristor converters 4, 4', output currents Icon1, Icon2 are shaped into a current waveform of a triangular wave. The peak value on the lower side of a current value is adjusted so as to come exactly to Icon1=0 and Icon2=0. As a result, in input currents Iu1, Iu2 of the thyristor converters 4, 4', harmonic components which are expressed by 6 m ± a first order, m=1, 3, 5,...} is increased, also an overall distorsion factor is increased, and a harmonic component which is expressed by 12 ± a first order, n=1, 2, 3,...} is reduced.

18. 发明专利

JPH10257776A PWM CONTROLLER 失效
公开(公告)号：JPH10257776A
公开(公告)日：1998-09-25
申请号：JP7456297
申请日：1997-03-11
申请人： HITACHI LTD
发明人： IWAJI YOSHINAO , OKUYAMA TOSHIAKI
IPC分类号： H02M7/48 , H02P27/08 , H02P5/41
摘要： PROBLEM TO BE SOLVED: To obtain a PWM(pulse width modulation) controller for a power converter, e.g. an inverter, in which high response PWM control can be ensured while suppressing beat phenomenon even when the carrier frequency is several times as high as a commanded frequency. SOLUTION: In a PWM generator 3 outputting a PWM waveform while determining at least one of the rise time or fall time of a pulse with respect to a command value of AC amount using a minimum unit of a specified microperiod Tc, a commander compensator 24 compensates for the conversion phase ϕ previously when the command value is converted from a DC amount to an AC amount such that the AC command value will be constant in the microperiod Tc and locks the conversion phase to a constant value ϕ' only during the interval Tc.

19. 发明专利

JPH09154283A CONTROL SYSTEM OF POWER CONVERTER 失效
公开(公告)号：JPH09154283A
公开(公告)日：1997-06-10
申请号：JP33408595
申请日：1995-11-29
申请人： HITACHI LTD
发明人： IWAJI YOSHINAO , OKUYAMA TOSHIAKI , IKIMI TAKASHI
IPC分类号： H02M7/48
摘要： PROBLEM TO BE SOLVED: To achieve the high speed for control response without the effect of a pulsating component when the pulsating component is present in the detected value of a current. SOLUTION: This system is constituted so that a voltage command value is operated by sampling the current command value of a load and the detected value of the current, the voltage command value and a triangular wave carrier are compared, PWM(pulse-width modulation) pulses are generated and driving is performed by the WMP pulses. In this case, when the current command value and the detected value of the current are sampled and the operating amount is operated, the periodicity of the pulsating component included in the detected current value is considered, and the detected current value is sampled at a period 11, which is longer than a period 13 for sampling the current command value. In the meantime, the calculation of the operating amount is performed in a short period in compliance with the sampling period 13 of the current command value.

20. 发明专利

JPH08251930A PWM CONTROLLER AND SYSTEM EMPLOYING IT 失效
公开(公告)号：JPH08251930A
公开(公告)日：1996-09-27
申请号：JP5395995
申请日：1995-03-14
申请人： HITACHI LTD
发明人： IWAJI YOSHINAO , OKUYAMA TOSHIAKI , IKIMI TAKASHI , TOBIYO MASAHIRO
IPC分类号： B21B37/46 , H02M5/297 , H02M7/48 , H02M7/5395 , H02P27/06 , H02P5/41
摘要： PURPOSE: To obtain a PWM controller for power converter in which low order harmonics and beating phenomenon can be suppressed even when the carrier frequency is several times as high as the frequency of a command value. CONSTITUTION: The PWM controller comprises a PWM modulator 3 receiving a command value from a command value generator 1 and outputting a pulse wave having width corresponding to the command value every predetermined period Δt and drives a semiconductor switching element constituting a power converter 4 based on the pulse wave thus produced. The PWM controller further comprises means 2 for sampling the command value two times or more within a predetermined period Δt and operating the mean command value within the period fit based on the sampled values. The PWM modulator can receive a mean command value from a command value compensation means to operate a pulse wave which is then outputted.

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