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1. 发明专利

JPH01314016A INPUT SIGNAL CONVERTING METHOD FOR DIGITAL SERVO SYSTEM 失效
公开(公告)号：JPH01314016A
公开(公告)日：1989-12-19
申请号：JP14372488
申请日：1988-06-13
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： NAGASE HIROSHI , MUTO NOBUYOSHI , MIYASHITA KUNIO , SUGIURA YASUYUKI , KOBAYASHI SUMIO , NAKAGAWA KAZUYUKI
IPC分类号： H03M1/60
摘要： PURPOSE:To attain inexpensive input signal conversion with high accuracy by converting once an analog command signal into a pulse signal having a frequency proportional to the command signal and detecting the said frequency. CONSTITUTION:A voltage/frequency converter (V/F converter) 1 receives an analog speed command signal and outputs a pulse signal having a frequency proportional to the level. The output of the V/F converter 1 is given to a counter 2, which counts number of pulses from the V/F converter 1 and just after a microcomputer circuit 101 reads the value for each prescribed read time, the counter 2 is reset by a reset signal from the microcomputer circuit 101. In this case, the count of the counter 2 is a value proportional to the pulse frequency, that is, the input analog signal and a digital signal proportional to the analog command signal is extracted. Then the digital command signal with high accuracy is obtained from the analog command signal with inexpensive constitution.

2. 发明专利

JPS6460285A CONTROLLER FOR INDUCTION MOTOR 失效
公开(公告)号：JPS6460285A
公开(公告)日：1989-03-07
申请号：JP21551787
申请日：1987-08-31
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： MUTO NOBUYOSHI , SAKAI KEIJIRO , IGARASHI SADAYUKI , UEDA AKITERU , TOMITA HIROYUKI
IPC分类号： H02P27/08 , H02M7/48
摘要： PURPOSE:To allow an induction motor to be stably driven with current respon siveness fully ensured even in high speed range, by increasing the frequency of a carrier wave when the motor speed exceeds the limits where the pulse number of a PWM signal comes to be reduced rapidly. CONSTITUTION:A DC power supply 10 is applied to an induction motor 40 through a PWM inverter 20. Comparators 91, 93 compares each voltage com mand signal with the carrier wave from a carrier wave generator 113. They produce three-phase PWM signals and a gate drive circuit 100 produces gate signals in correspondence with these PWM signals and applies them to each power switching element of a PWM inverter 20. The carrier wave frequency from the carrier wave generator 113 is variably controlled by the command from a carrier wave frequency command generator 112 in accordance with the rotating speed of the induction motor 40.

3. 发明专利

JPH0232785A CONTROL OF AC SERVO MOTOR 失效
公开(公告)号：JPH0232785A
公开(公告)日：1990-02-02
申请号：JP18183988
申请日：1988-07-22
申请人： HITACHI LTD , HITACHI KEIYO ENG
发明人： NAGASE HIROSHI , MUTO NOBUYOSHI , MIYASHITA KUNIO , SUGIURA YASUYUKI , KOBAYASHI SUMIO , NAKAGAWA KAZUYUKI
IPC分类号： H02P21/00 , H02P21/06 , H02P21/22 , H02P23/07 , H02P23/08 , H02P23/16 , H02P23/18 , H02P25/026 , H02P27/04 , H02P27/08
摘要： PURPOSE:To make a control device common to an induction motor and a synchronous motor by switching the command of current portion in the same direction as in the flux of an AC motor with the induction motor and synchronous motor. CONSTITUTION:A q-axis current command Iq* is found in accordance with the deviation of a speed detection signal omegar from a speed command signal omegar*. A d-axis current command Id* is found in accordance with the speed detection signal omegar. On the other hand, a flux position detective means 9a finds a flux position signal theta* based on the d-axis current command Id*, q-axis current command Iq* and speed detection signal omegar. A current command operational means 10 operates the primary current command from the d-axis current command, q-axis current command and position signal. In case a control device is applied to a synchronous motor, a switching means 8 is switched over to make the d-axis current command Id* zero and the flux position detecting system is changed over. The control device can be shared by the induction motor and synchronous motor.

4. 发明专利

JP2000095453A CONTROL DEVICE FOR ELEVATOR 失效
公开(公告)号：JP2000095453A
公开(公告)日：2000-04-04
申请号：JP26429298
申请日：1998-09-18
申请人： HITACHI LTD
发明人： ONUMA NAOTO , HOKARI SADAO , NAGASE HIROSHI , KISHIKAWA KOSEI , FURUHASHI MASAYA , MUTO NOBUYOSHI
IPC分类号： B66B1/30 , B66B3/00 , H02P21/00 , H02P21/22 , H02P21/36 , H02P23/07 , H02P23/16 , H02P27/04 , H02P27/08
摘要： PROBLEM TO BE SOLVED: To set an appropriate control constant in an installed condition and obtain favorable comfortableness by providing a means automatically measuring the electric constant of a motor, and setting the control constant from the measured constant. SOLUTION: A control constant used for torque control of an elevator is set based on the electric constant of a motor from a motor constant computing means 200. Under the stop condition of the elevator, an inverter 40 is used to let flow direct current in a motor 60, and the primary resistance of the motor is measured. Similarly under the stop condition, alternating current is let flow in the motor 60, and the secondary resistance of the motor is measured. Exciting inductance is measured under the operating condition elevatably driving the elevator. Further, from measurement of compound leakage inductance, primary and secondary leakage inductances are computed. Under the installed condition, these electric constants of the motor are automatically measured, an appropriate control constant can be set, and hereby favorable comfortableness can be obtained.

5. 发明专利

JP2000053335A DRIVE CONTROL DEVICE FOR ELEVATOR 失效
公开(公告)号：JP2000053335A
公开(公告)日：2000-02-22
申请号：JP22028098
申请日：1998-08-04
申请人： HITACHI LTD
发明人： OMIYA AKIHIRO , MUTO NOBUYOSHI
IPC分类号： B66B1/06 , B66B1/30
摘要： PROBLEM TO BE SOLVED: To maintain high efficiency and restrain vertical vibration of a car even when load impressed onto a motor changes, by inputting deviation of outputs from respective estimation means of load torque, generation torque to a simulation means for vibration reverse transmission characteristic, and by injecting the output into a torque command. SOLUTION: An elevator is generally in a region where machine natural frequency easily resonates with drive frequency of a motor, the frequency is excited by torque ripple of the motor to degrade comfortableness of the elevator. The vibration has a mode overlapped with speed of the motor. Thus, load torque vibration is estimated using motor detection speed ωM (300), the estimated value is passed through a simulation means for vibration reverse transmission characteristic derived based on response characteristic from input torque to an elevator machine series drive pulley to car vertical vibration (302), and thereby, component for restraining vertical vibration of a car 90 can be calculated. By injecting this into a torque command, the vibration can be restrained and suitable comfortableness can be secured.

6. 发明专利

JPH11235081A LOAD DEVICE DRIVE SYSTEM 失效
公开(公告)号：JPH11235081A
公开(公告)日：1999-08-27
申请号：JP3833498
申请日：1998-02-20
申请人： HITACHI LTD
发明人： SHIRAKAWA SHINJI , MUTO NOBUYOSHI , KOMATSU SEIJI
IPC分类号： H02M7/48 , H02P7/00 , H02P25/098 , H02P29/00
摘要： PROBLEM TO BE SOLVED: To provide a load device drive system which can suppress radiation of electromagnetic waves. SOLUTION: An electric converter housing 1 and a motor housing 2 are fixed on a conductor board 3 with screws 5 at respective bottom surfaces. The impedance of a feedback route from the motor housing 2 to the electric converter housing 1 through the conductor board 3 is small, therefore, a phase difference between noise current running through a wire 4 and noise current running through the electric converter housing 1 from the motor housing 2 via the conductor board 3 becomes small, so that the amount of electromagnetic waves radiated toward a space becomes small.

7. 发明专利

JPH10310342A ELEVATOR GUIDE DEVICE 失效
公开(公告)号：JPH10310342A
公开(公告)日：1998-11-24
申请号：JP12526297
申请日：1997-05-15
申请人： HITACHI LTD , HITACHI BUILDING SYST CO LTD
发明人： KOMIYA KENKICHI , ANDO TAKEYOSHI , KONYA MASAHIRO , MUTO NOBUYOSHI
IPC分类号： B66B7/02 , B66B11/02
摘要： PROBLEM TO BE SOLVED: To provide a control method for an elevator guide device reducing horizontal vibration of a car. SOLUTION: Output of an acceleration detector 71 fitted to the upper part of a car 1 is amplified by an amplifier 61 of a control device 6a and sent to a current amplifier 62 by a supplementary control means 8 for amplifying an attractive force command of an electromagnet according to frequency, so as to supplement the attractive force command and to convert an electromagnet current of a magnetic guide 51 by the current amplifier 62. As to the other magnetic guide 52, the phase is reversed by a phase reversing means 63 provided behind the amplifier 61, and the current of an electromagnet is converted by a current amplifier 62.

8. 发明专利

JPH10304667A PWM CONVERTER DEVICE 失效
公开(公告)号：JPH10304667A
公开(公告)日：1998-11-13
申请号：JP10569497
申请日：1997-04-23
申请人： HITACHI LTD
发明人： HOKARI SADAO , MUTO NOBUYOSHI , ONUMA NAOTO , MITSUNE SHUNSUKE
IPC分类号： G05F5/00 , H02M7/12 , H02M7/21 , H02P27/06 , H02P5/41
摘要： PROBLEM TO BE SOLVED: To drive PWM pulse duration modulation converter by taking DC voltage command suited to power supply voltage and required power of load, and usually setting smoothing capacitor voltage low. SOLUTION: This converter device involves a PWM converter 3, connected to an AC power source 1 through an AC reactor 2, a smoothing capacitor 4 connected to the DC side of the PWM converter 3, a load device which uses the smoothing capacitor 4 as a voltage source, and controls the input current of the PWM converter so that the voltage of the smoothing capacitor 4 is a voltage based on a DC voltage command value, whereas this device is provided with a means 11 which detects AC power supply voltage, a means 27 which detects the power of the load device, and a means 16 which generates the DC voltage command, based on the detected power supply voltage and load power.

9. 发明专利

JPH09272663A DRIVE CONTROLLER FOR ELEVATOR 失效
公开(公告)号：JPH09272663A
公开(公告)日：1997-10-21
申请号：JP8234296
申请日：1996-04-04
申请人： HITACHI LTD
发明人： OMIYA AKIHIRO , MUTO NOBUYOSHI
IPC分类号： B66B1/06 , B66B1/30
摘要： PROBLEM TO BE SOLVED: To hold high efficiency and suppress vertical vibration of a riding car, when load applied on an electric motor is changed in any state, by inputting deviation of an output of a load torque estimation means and a generated torque estimation means into a torque instruction. SOLUTION: A momentary torque generated inside an electric motor 60 is so controlled that the ratio of an excitation current and torque current following transitionally at high efficiency is held in relation to a torque instruction τR. At the same time, a vibration component of the electric motor loading torque is estimated and a vibration control signal τT is inputted into the torque instruction τR so as to miniaturize the vertical vibration of a riding car 90. The vibration of the riding car 90 is decreased, while controlling the electric motor 60 at high efficiency including its transitional state. This constitution can provide high energy saving effects and enlarge vibration control effects.

10. 发明专利

JPH09149646A PWM CONVERTER CONTROLLER 失效
公开(公告)号：JPH09149646A
公开(公告)日：1997-06-06
申请号：JP30244995
申请日：1995-11-21
申请人： HITACHI LTD
发明人： HOKARI SADAO , MUTO NOBUYOSHI , ONUMA NAOTO
IPC分类号： H02M7/12 , H02M7/155 , H02M7/48 , H02M7/72 , H02P27/06 , H02P7/63
摘要： PROBLEM TO BE SOLVED: To control so as to obtain a sine wave current whose power supply power factor is 1 and which has very little harmonic components by a method wherein the AC side voltage of a PWM converter is controlled in accordance with the resultant vector value of a current control means and a power supply voltage compensating means. SOLUTION: When the voltage of a smoothing capacitor 4 drops, a voltage command Ed ' from a DC voltage setting device 901 is compared with a voltage value Ed from a DC voltage detector 8 by an adder 902 and the amplitude value Im ' of the input current of a PWM converter 3 is outputted by a voltage control unit 903 so as to make the deviation between the command and the detected value zero and a phase θs ' which is synchronized with an AC power supply 1 is outputted from a power supply phase calculating unit 911. An input current command is ' is outputted from a current command calculating unit 912 in accordance with the amplitude value Im ', the phase θs ' and a sine function and compared with an actual input current value is from a current detector 7 by an adder 905 and a voltage signal Δec ' by which the AC side voltage of the PWM converter 3 is so regulated as to make the deviation between the command and the actual value zero is outputted from a current control unit 906. As a result, the control by which a sine wave current whose power supply power factor is 1 and which has vert little harmonic components can be obtained is realized.

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