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1. 发明专利

JPH0548080B2 失效
公开(公告)号：JPH0548080B2
公开(公告)日：1993-07-20
申请号：JP6362383
申请日：1983-04-13
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： KOBAYASHI SUMIO , NINOMYA JUICHI , TOMITA HIROYUKI , IBORI SATOSHI , IGARASHI SADAYUKI
IPC分类号： H02P27/08 , H02P21/00 , H02P21/04 , H02P21/22 , H02P21/36 , H02P23/00 , H02P23/03 , H02P23/07 , H02P7/62

2. 发明专利

JPS6281990A CONTROLLER FOR INDUCTION MOTOR 失效
公开(公告)号：JPS6281990A
公开(公告)日：1987-04-15
申请号：JP22007785
申请日：1985-10-04
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： IGARASHI SADAYUKI , NINOMIYA JUICHI , MIURA SATOSHI , IKENO SHOJI , TOMITA HIROYUKI
IPC分类号： H02P27/04 , H02P21/00 , H02P21/22 , H02P21/36 , H02P23/07 , H02P23/08 , H02P23/16 , H02P23/24 , H02P27/06
摘要： PURPOSE:To conduct regenerative braking up to a value in the vicinity of a low-speed command from a high-speed command, and to prevent the reverse rotation of a motor by detecting the code conversion of primaty angular frequency and interrupting feed. CONSTITUTION:When a forward-rotation command 35 is inputted to a negative- phase detector 37, the detector 37 outputs a signal when an output from an adder 14, primary angular frequency w1, changes to a negative code from a positive code. The output signal is transmitted over an error amplifying circuit 11 and a transistor drive circuit 20. The error amplifying circuit 11 short-circuits and resets an integral element, and brings a torque-current component command it to zero. On the other hand, the transistor drive circuit 20 receives the output signal from the negative-detector 37, brings an output from an inverter 4 as a frequency conversion means to zero and interrupts feed to an induction motor 2.

3. 发明专利

JPH07270180A APPARATUS FOR SUPPLYING POWER TO ENCODER 失效
公开(公告)号：JPH07270180A
公开(公告)日：1995-10-20
申请号：JP31151794
申请日：1994-12-15
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： KOBAYASHI SUMIO , IKENO SHOJI , IGARASHI SADAYUKI
IPC分类号： G01D5/245 , G01D5/244 , G08C19/00 , H02K11/00
摘要： PURPOSE:To correct to a desired output voltage of an encoder power feed circuit by obtaining a decreased amount of voltage of a power feed line from a voltage of an encoder fed back to the encoder power feed circuit. CONSTITUTION:A voltage signal line 42A is set to feed back a voltage of an encoder 2 to a controller 1, which is connected in series to a resistance R5. A terminal voltage PVf of the encoder 2 is proportionally divided between a resistance 5 and a resistance 6, and input to an INV terminal of an IC11. In this constitution, an output voltage PV of an encoder source feed circuit is first adjusted by a variable resistance VR1, so that the desired voltage PVf is impressed to the encoder 2. Even when a decreased amount of voltage of an encoder cable 4 is changed in accordance with a change of surrounding temperatures, the output voltage PV of the encoder power feed circuit can be automatically corrected.

4. 发明专利

JPH01174284A SPEED DETECTOR USING RESOLVER 失效
公开(公告)号：JPH01174284A
公开(公告)日：1989-07-10
申请号：JP32707787
申请日：1987-12-25
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： IGARASHI SADAYUKI , CHIBA HIROSHI , SAKAI KEIJIRO
IPC分类号： H02P29/00 , H02P29/20
摘要： PURPOSE:To realize a speed control in a wide range and a position control of high accuracy in an electric motor by setting an excitation frequency of a resolver in its excitation power supply circuit to a high value in a speed control condition and to a low value in a position control condition. CONSTITUTION:In accordance with a speed control operation mode set by an operator, a speed control condition signal 1 is input to a control unit 3 of an electric motor 7. Thus the control unit 3 outputs an excitation frequency instruction signal 4 of excitation frequency fe, determined from a maximum rotary speed, to an excitation power supply circuit 5 of a resolver 8. While in accordance with a position control operation mode set by the operator, the electric motor 7 is decelerated obtaining a low speed thereafter the speed control condition signal 1 is released, and a position control condition signal 2 is input. In this way, the control unit 3 outputs an excitation frequency instruction signal 4 of excitation frequency fe lower than that in the before said speed control condition determined from resolving power of a rotary speed.

5. 发明专利

JPS6373896A NOISE WARNING DEVICE OF MOTOR CONTROLLER 失效
公开(公告)号：JPS6373896A
公开(公告)日：1988-04-04
申请号：JP21394486
申请日：1986-09-12
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： IGARASHI SADAYUKI , MIURA SATOSHI , SUGAI HIROSHI , KOBAYASHI SUMIO
IPC分类号： H02P29/00 , H02P7/00
摘要： PURPOSE:To provide a simple device for warning that noise is superposed to a command signal by employing a method of indicating and warning that the noise level on a speed signal exceeds a prescribed value. CONSTITUTION:A speed control member 6 performs speed control of a motor 7 corresponding to the deviation between speed command and speed detection values. If the speed command signal with noise superposed thereto is inputted in a high pass filter 2, DC and low-frequency components are filtered and only high frequency components are outputted. This output is converted to an absolute value and smoothed by an absolute value smoothing circuit 3 in the next stage. Further a discrimination circuit 4 discriminates whether the smoothed output exceeds a prescribed value or not, and if it exceeds the prescribed value an indication lamp 5 is lit. In this constitution, it is easily seen that noise exceeding the prescribed value is superposed to the speed command signal.

6. 发明专利

JPS60226778A CONTROLLER OF REGENERATIVE CONVERTER 失效
公开(公告)号：JPS60226778A
公开(公告)日：1985-11-12
申请号：JP8190984
申请日：1984-04-25
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： IGARASHI SADAYUKI , NINOMIYA JIYUICHI , KOBAYASHI SUMIO
IPC分类号： H02P3/14 , H02M7/66 , H02M7/72 , H02P3/18
摘要： PURPOSE:To control the change rate of a regenerative current substantially constantly by using the difference between a regeneration starting voltage produced by adding the prescribed value to the peak value of an interphase voltage and a DC voltage as a regenerative current command. CONSTITUTION:A voltage setter 26 detects the peak value of an interphase voltage of received AC voltage, and outputs a regeneration starting voltage E0 added with the prescribed value to the peak value. When a DC voltage E becomes higher than the voltage E0, a voltage error amplifier 14 generates a regenerative current command value I0. A deviation between the value I0 and a regenerative current detected value I is compared through a current error amplifier 18 with a triangular wave from a triangular wave generator 20. The output of the compared result is input together with the output of a phase detector 25 to AND gates 37-39 to control ON or OFF the switching transistors 61-66 of a regenerative converter.

7. 发明专利

JPS5944977A Ac power source control system 失效
标题翻译：交流电源控制系统
公开(公告)号：JPS5944977A
公开(公告)日：1984-03-13
申请号：JP15452782
申请日：1982-09-07
申请人： Hitachi Ltd
发明人： NINOMIYA JIYUICHI , IBORI SATOSHI , NAGASE HIROSHI , IGARASHI SADAYUKI , SUGAI HIROSHI
IPC分类号： H02M7/48
CPC分类号： H02M7/48 , H02P2207/01 , H02P2207/05
摘要： PURPOSE:To enhance the responsiveness of controlling an AC power source by detecting the rate of change of the output current command value and altering the gain of a feedback system in response to the rate of change, thereby automatically controlling the controlling and responding characteristics in response to the rate of change of the output current command value. CONSTITUTION:Main switching elements 2A, 2B are PWM-switched in response to the error signal which is obtained from an error amplifier 7 as the difference between the output current command value and the output current detection value, thereby controlling the feedback so that the instantaneous value of the output current supplied to a motor converges to the instantaneous value of the output current command value. Further, a multiplier 15 is provided, and the amplitude of a carrier signal which is inputted to a comparator 9 is varied in response to the control signal by the multiplier 15. As a result, the PWM operation which is performed by the comparator 9 with the error signal as a modulation input signal is performed on the basis of the carrier signal which is varied in amplitude by the control signal.
摘要翻译：目的：通过检测输出电流指令值的变化率和响应变化率改变反馈系统的增益来增强交流电源的控制响应，从而自动控制响应中的控制和响应特性到输出电流指令值的变化率。构成：主开关元件2A，2B响应于从误差放大器7获得的误差信号作为输出电流指令值和输出电流检测值之间的差值进行PWM开关，从而控制反馈，使得瞬时提供给电动机的输出电流的值收敛到输出电流指令值的瞬时值。此外，提供乘法器15，并且输入到比较器9的载波信号的幅度响应于乘法器15的控制信号而改变。结果，由比较器9执行的PWM操作与基于通过控制信号在幅度上变化的载波信号来执行作为调制输入信号的误差信号。

8. 发明专利

JPH0538181A CONTROLLER FOR INDUCTION MOTOR 失效
公开(公告)号：JPH0538181A
公开(公告)日：1993-02-12
申请号：JP31131691
申请日：1991-10-31
申请人： HITACHI LTD
发明人： SUGAI HIROSHI , CHIBA YUTAKA , NINOMIYA JUICHI , NAGASE HIROSHI , IGARASHI SADAYUKI
IPC分类号： H02P21/00 , G01L5/00 , H02P27/04 , H02P27/06
摘要： PURPOSE:To provide a controller for induction motor which can maintain predetermined operating conditions regardless of torque variation of the induction motor. CONSTITUTION:Amultiplier 12 delivers a signal representing the torque of an induction star to a function generator 23 which then generates an exciting current control signal IM having predetermined functional relation with the signal T, and a vector operating circuit 6 generates primary current commands iu, iv, iw to be fed to respective phases of the induction motor. Consequently, exciting current decreases as the torque decreases and thereby the induction motor is operated at maximum efficiency while furthermore, air gap flux of the induction motor decreases to suppress electromagnetic noise thus realizing noise reduction.

9. 发明专利

JPS6348176A REVERSE-CONNECTION PROTECTIVE ALARM DEVICE FOR DC POWER-CONSUMING APPARATUS 失效
公开(公告)号：JPS6348176A
公开(公告)日：1988-02-29
申请号：JP18845686
申请日：1986-08-13
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： IKENO SHOJI , IGARASHI SADAYUKI , MIURA SATOSHI , CHIBA HIROSHI , SUGAI HIROSHI
IPC分类号： H02M1/00 , H02P3/18
摘要： PURPOSE:To protect a regenerative braking device or the like from being reverse-connected, by providing the input circuit of DC voltage with a reverse- blocking diode for blocking direct current in the direction opposite to that on working, and an indication circuit. CONSTITUTION:By connecting the terminal P of the DC voltage source of a regenerative braking device 2 to one end of a discharge resistance 7 and by connecting the other end of the discharge resistance 7 to the collector of a power transistor 8 via a reverse-connection preventive circuit 15 and by connecting the emitter of the transistor 8 to a terminal N, a regenerative braking circuit is composed. The reverse-connection preventive circuit 15 consists of a reverse-blocking diode 11 for blocking direct current in the direction opposite to that on working, a light-emitting device 13 connected to the reverse- blocking diode 11 in parallel with each other, and a protective resistance 12.

10. 发明专利

JPS62189986A CONTROL DEVICE OF INDUCTION MOTOR 失效
公开(公告)号：JPS62189986A
公开(公告)日：1987-08-19
申请号：JP2884486
申请日：1986-02-14
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： TOMITA HIROYUKI , NINOMIYA JUICHI , IGARASHI SADAYUKI , YAMAZAKI TADASHI
IPC分类号： H02P27/04 , H02P3/18 , H02P21/00 , H02P21/22 , H02P21/36 , H02P23/07 , H02P23/08 , H02P23/16
摘要： PURPOSE:To miniaturize a regenerative power treating circuit and simplify the circuit constitution during regenerative operation of an induction motor, by a method wherein torque current component command is made in a speed reduction command manner lower than a predetermined regenerative treatment capacity of the regenerative power treating circuit. CONSTITUTION:Output of an exciting current component setting means 16 and a torque current component command means 40 is supplied to a control means 50, and a frequency converting means 4 is controlled. The torque current component command means 40 is provided with a speed reduction pattern generating circuit 21 between a speed setting device 7 and a subtractor 10. Speed reduction pattern of the speed reduction pattern generating circuit 21 is set so that the regenerative power becomes less than the allowable regenerative power of the frequency converting means 4, and during regenerative operation of an induction motor 2, the induction motor 2 is controlled by the speed reduction patter of the speed reduction pattern generating circuit 21.

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