Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kaisha

Kei Terada

Hidetoshi Ikeda

Tetsuaki Nagano

Kazutaka Takahashi

Takashi Isoda

Kiyoshi Maekawa

Yoshihiro Marushita

Masahiko Yoshida

Tetsuya Tanabe

Akira Tanabe

Yuji Igarashi

Yoshihiko Kinpara

Hisao Sakurai

Masanori Ozaki

Yuji Nishizawa

Kazuya Nakamura

Yasunobu Harada

Akira Hatai

Hiroto Takei

Satoshi Aoki

Shigetoshi Kunieda

Emiko Hayasaka

Shigeo Jimbo

A selection device includes: an information acquisition unit acquiring machine specification information, operation pattern information, and mechanical component specification information; a capacity calculation unit calculating capacity of a motor required for operating the machine based on the machine specification information, the operation pattern information, and the mechanical component specification information; a motor selection unit selecting a motor based on the capacity and information held in a motor database; an amplifier selection unit selecting an amplifier based on information on the selected motor and information held in an amplifier database; a mechanical component selection unit selecting the mechanical component based on the mechanical component specification information, the information about the motor selected by the motor selection unit, and information held in a mechanical component database; and a display unit displaying selection results obtained by the motor selection unit, the amplifier selection unit, and the mechanical component selection unit.

Selection device, selection method, and recording medium

To provide an electric power conversion device that converts direct current power supplied from a direct-current power supply into alternating current power, the electric power conversion device includes six switching elements constituted by a voltage-driven transistor that uses a wide bandgap semiconductor and a diode, and a drive circuit that controls a voltage for driving the transistor at a time of turning off the switching elements based on a predetermined voltage profile specifying that the transistor is operated in a non-linear region.

Electric power conversion device and surge voltage suppressing method

An integrated servo system and a method of controlling a motor is provided. The integrated servo system includes a position detector which determines original position data of a motor and a position signal processor which determines a position of the motor based on the determined position data. The integrated servo system further includes a servo controller circuit which controls the motor based on the determined position data and a parallel bus through which the determined position data is transmitted from the position signal processor to the servo controller circuit.

Integrated servo system

To stably control a driving object to approach and contact a pressure object at a low impact, to suppress a vibration generated when the driving object presses the pressure object, and to enable a motor controller to operate based on a simple command, a regression torque controller of the motor controller limits a torque-control velocity command to up to a velocity limit value vlim defined based on a contact velocity between a driving object and a pressure object and outputs the torque-control velocity command, and a velocity controller of the motor controller calculates a torque command so that a motor velocity can follow the torque-control velocity command output from the regression torque controller.

Motor controller

Provided is a motor control device which realizes automatic adjustment of control of a motor for driving a mechanical load through a simple operation. The motor control device includes: a follow-up control unit () for receiving detection information of a detector () to output a torque command signal and output a status of motor control of a motor () as a control status amount signal, when a command signal regarding the motor control to be output from an upper-level controller is absent; an oscillation detection unit () for receiving the control status amount signal and detecting oscillation of a control status amount to output an oscillation detection signal; and an automatic adjustment unit () for receiving the oscillation detection signal to monitor a control status of the motor () and adjust a control parameter of the follow-up control unit () only when abnormality is detected.

Motor control device

If there is static friction, the magnetic pole position estimation is completed at the time when error torque used for magnetic pole position estimation becomes less than the friction, so that there remains magnetic pole error. A problem has been that when the error torque becomes less than a forward static friction, there remains a positive magnetic pole deviation and when the error torque becomes less than a backward static friction, there remains a negative magnetic pole deviation. By shifting in the negative direction and the positive direction initial values for estimating a magnetic pole error in operation sets, a true pole-error estimation value is estimated in the use of a pole-error estimation value having a positive magnetic pole error obtained by the positive shift operation and a negative one obtained by the negative shift operation, which can reduce estimation error due to the static friction.

Magnetic pole position estimation method for AC synchronous motor

A computing unit simulates an ideal operation of a vibration excitation actuator by using at least a model operation parameter and the vibration-excitation movable mass data and calculates a parameter corresponding to acceleration/deceleration thrust for moving the vibration-excitation movable mass. A vibration isolation controller determines a control content of a vibration isolation driving unit based on the parameter corresponding to the acceleration/deceleration thrust and controls an operation of the vibration isolation driving unit so that a force canceling a reaction force, which acts on an apparatus when a vibration-excitation movable mass is moved, acts on the apparatus by moving the vibration isolation movable unit.

Vibration isolation control system

An accurate load position control is made possible even when rigidity of a load drive system using a motor is relatively low. Load position signal xis a present-position measurement value of a load, and after compensation in response to a phase delay thereof has been performed by a stability compensation circuit, the high-frequency portion thereof is taken as a control-target position signal xby replacing, in a position-signal combination circuit, a motor position signal xm as a present-position measurement value of a motor, and then the control-target position signal xis fed back to a position control circuit. Thereby, a torque command signal indicating a torque target value for driving the load is outputted.

Machine position control device

In a servo controller according to the invention, a position feedback correction unit () calculates a first-axis position feedback signal (pmfb) based on a first-axis position (pm) as a self-axis position, and a second-axis position (pm) as an other-axis position; and a deviation between a model position (pa) and the first-axis position feedback signal (pmfb) is inputted from a subtracter () to a position control unit (), which performs positional control to output a velocity command. A velocity feedback correction unit () calculates a first-axis velocity feedback signal (wmfb) from a first-axis velocity (wm) as the self-axis velocity, and a second-axis velocity (wm) as the other-axis velocity; and the velocity control unit () adds a model velocity (wa) and the velocity command outputted from the position control unit (), and subtracts the first-axis velocity feedback signal (wmfb) therefrom, and outputs a feedback torque command (Tfb) based on the corrected velocity command.

Servo controller

An objective is to obtain a high robust position controller and a controlling method therefor, with respect to their technique in which control gain, in order to prevent an overshoot due to frictions, is most suitably adjusted. The position controller having a feedforward system includes: a friction-coefficient-estimated-value setting unit for setting arbitrary friction-coefficient-estimated-values; an overshoot-prevention-gain calculator for determining speed-integral-term feedforward gain, based on estimated friction-coefficient values set by the friction-coefficient-estimated-value setting unit; and a speed feedforward multiplying unit for calculating the product of the speed-integral-term feedforward gain multiplied by a feedforward command value that is based on a positional command; the multiplication product from the speed feedforward multiplying unit being used to reduce the feedforward term.

Position controller and controlling method therefor

In a motor control device according to the invention, upon velocity control of a motor, a superimposed signal generating unitoutputs a superimposed signal idh of a repetitive waveform, such as a triangular wave or a sine wave. A d-axis current command generating unitadds the superimposed signal idh generated by the superimposed signal generating unitto a d-axis current command idc*0 and outputs a d-axis current command idc*. An axial misalignment detecting unit(, and) receives the d-axis current command idc* and a q-axis current command iqc* and outputs an axial misalignment angle estimation value &#x394;&#x3b8;^. An axial misalignment correction unitreceives the axial misalignment angle estimation value &#x394;&#x3b8;^ and an actual detected position &#x3b8;m and outputs a position after correction &#x3b8;m'. Therefore, detection and correction can be performed in real time through calculation at a given timing during a normal operation.

A control device for an induction motor controlling torque generation of the induction motor with high precision includes a rotation speed detector which detects the rotation speed of the induction motor, a current detector which detects a primary current of the induction motor; an amplifying unit which amplifies deviation between an estimated primary current obtained from a magnetic flux observing device and the primary current obtained from the current detector; a magnetic flux observing device which estimates an estimated secondary magnetic flux and an estimated primary current of the induction motor based upon the rotation speed obtained from the rotation speed detector, the primary voltage of the induction motor and the deviation signal obtained from the amplifying unit, and a control unit which controls a voltage applied to the induction motor based upon the estimated secondary magnetic flux obtained from the magnetic flux observing device. In this arrangement, the amplifying unit amplifies the deviation of the primary current based upon feedback gains consisting of eight respectively independent factors. Thus, it is possible to provide torque control with high precision even at the time of low-speed operation.

Method of controlling induction motor

The present invention provides a variable-speed control system which is capable of estimating saturation voltages of respective switching elements in the inverter operation to execute the saturation voltage compensation and thus getting an inverter output voltage indicated by a command value.

Power converter device

An acceleration signal generating portion inputs a machine velocity vm of a drive machine and outputs an acceleration signal af of low frequency. Also, a pseudo torque signal generating portion inputs a torque command &tgr;r, removes the noise, and outputs a pseudo torque signal &tgr;f of low frequency. Also, a torque error signal calculating portion subtracts a product of the acceleration signal af and a previous mechanical constant estimated value Je(k&minus;1) calculated in a multiplication circuit from the pseudo torque signal &tgr;f of low frequency, and outputs a torque error signal &tgr;err as a disturbance torque estimated value &tgr;d0. Also, a mechanical constant estimation gain portion estimates the mechanical constant by inputting a torque error derivative signal d&tgr;err that is generated by torque error derivative signal generating portion by inputting a torque error signal &tgr;err. Also, a mechanical constant estimation gain portion starts or stops to update the mechanical constant estimating operation, based on a disturbance torque estimated value &tgr;d0, or alters the mechanical constant estimation gain. Also, a mechanical constant estimated value operating portion adds the previous mechanical constant estimated value Je(k&minus;1) to the error output from the mechanical constant estimation gain portion , and outputs the mechanical constant estimated value Je(k).

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Tokyo, Japan

Kei Terada