Kabushiki Kaisha Yaskawa Denki

Other

Keisei Inoki

Toshihiro Hanada

Yasuhiko Kaku

Hideaki Iura

Kazuhiro Tsuruta

Nobuhiro Umeda

Takehiko Komiya

Masashiro Tanaka

Hirotaka Karakama

Takahiro Uchino

Yasufumi Yoshiura

Kozo Ide

Tetsuro Izumi

Wennong Zhang

Ryuichi Oguro

Takahiro Saeki

Satoshi Sueshima

Kunimasa Ando

Hiroyuki Imayoshi

Kazuhide Takao

Shinichi Akimoto

Shigenori Takayama

Shoji Konakahara

Tsutomu Kubo

Yoichi Yano

Shuichi Mihara

Kengo Nakahara

Soki Kaku

A power conversion deviceincludes a matrix converter circuitincluding a plurality of switching elements and being configured to perform bidirectional power conversion between alternating current power on a primary side and alternating current power on a secondary side, a power conversion control unitconfigured to switch on and off the plurality of switching elements in unison with a carrier wave to cause an alternating current on the secondary side to follow a control command, and a carrier wave changing unitconfigured to change, based on a nearness level between a frequency on the primary side and a frequency on the secondary side, a frequency of the carrier wave.

Power conversion device, power conversion method, and program

The power conversion device may include: power conversion circuitry configured to perform a power conversion for outputting a driving power to an induction motor; and control circuitry. The control circuitry may be configured to: receive a master command phase from a master power conversion device; generate a voltage command having a command phase in a rotating coordinate system based on a torque target value, wherein a rotating magnetic field for driving a rotor of the induction motor is generated to rotate with the rotating coordinate system; calculate a rotation phase of the rotating coordinate system based on a command phase difference between the master command phase and the command phase to reduce the command phase difference; and control the power conversion circuitry to output the driving power to the induction motor, in synchronization with the master power conversion device, based on the rotation phase and the voltage command.

Power conversion device

A power conversion apparatus includes: matrix converter circuitry configured to perform bidirectional power conversion between a primary side and a secondary side; and control circuitry configured to: calculate a deterioration level based on a secondary side current of the matrix converter circuitry, a carrier frequency, and a primary-secondary frequency difference between a primary side frequency and a secondary side frequency of the matrix converter circuitry; and output a deterioration notification in response to determining that the deterioration level exceeds a predetermined level.

Bidirectional power conversion

A power conversion apparatus includes: matrix converter circuitry configured to perform bidirectional power conversion between a primary side and a secondary side; and control circuitry configured to: select a first control mode in response to determining that a command-primary frequency difference between a command frequency and a primary side frequency of the matrix converter circuitry is above a predetermined threshold, wherein the first control mode includes causing a secondary side frequency of the matrix converter circuitry to follow the command frequency; select a second control mode in response to determining that the command-primary frequency difference is below the threshold, wherein the second control mode includes maintaining a primary-secondary phase difference between a secondary side phase and a primary side phase of the matrix converter circuitry within a predetermined target range; and control the matrix converter circuitry in accordance with a selection of the first control mode or the second control mode.

A matrix converter includes a power converter circuit connectable on one side thereof with an alternating-current supply via a high-frequency filter and connectable on another side thereof with an alternating-current motor; a snubber circuit connected with a one-side line for connecting the high-frequency filter and the power converter circuit; a discharge switch discharging a charge accumulated in the snubber circuit depending on a voltage of the snubber circuit; and a control circuit configured to execute controlling the power converter circuit on the basis of a carrier frequency in test such that a test voltage is applied to the alternating-current motor, changing the carrier frequency in test on the basis of an operation state of the discharge switch, and determining constants of the alternating-current motor on the basis of a response state of the alternating-current motor at the time when the test voltage is applied.

Matrix converter and method for determining constants of alternating-current motor

A power conversion apparatus includes a power converter to directly convert AC power having a frequency into AC power having a different frequency. A gate driver drives the power converter. A gate drive signal generator generates a gate drive signal supplied to the gate driver. Two cutoff devices are coupled between the gate driver and the gate drive signal generator, and supply or cut off the gate drive signal to the gate driver based on a command from an external apparatus. At least one of the two cutoff devices generates a feedback signal. An analyzer determines whether the one cutoff device has an abnormality based on the command and the feedback signal. A cutoff controller controls another one of the two cutoff devices to cut off the gate drive signal to the gate driver when the analyzer determines that the one cutoff device has the abnormality.

Power conversion apparatus and method for analyzing for abnormality in power conversion apparatus having cutoff devices

The motor driving system includes a driving state amount detector configured to detect a driving state amount, a motor control part configured to perform a power supply control, a higher control part capable of outputting a higher control command to the motor control part, and a safety requesting part that inputs a safety request signal to the motor control part. The motor control part includes a motor control circuit part that performs the power supply control, a mode selecting and executing part configured to select and execute either a first safety function mode or a second safety function mode, and a comparing and monitoring processing part that compares the driving state amount and a predetermined operation monitoring pattern, when the safety request signal is inputted.

Motor driving system, motor controller, and safety function expander

A motor controller capable of detecting an oscillation of a feedback loop and performing gain adjustment while updating a gain value of a control unit is provided. The motor controller includes an electric motor, an operation-amount detector, a control unit, a machine, a disturbance signal generator which generates a sweep sine wave, a compensation-driving-force detector, a vibration calculator, an oscillation detector, a vibration storage, a simulated open-loop gain calculator, a gain changer, and an automatic gain changer, and detects an oscillation by processing a response signal in time series on the basis of a first threshold regarding to a magnitude of vibration and a second threshold regarding a frequency.

Motor controller

It is an object of the invention to provide a motor control apparatus capable of ensuring a control function even for a large inertia moment ratio. In a motor control apparatus including a position detecting portion (B) of a motor () for driving a mechanism a moment of inertia of which is unknown, a speed calculating portion (C), a position control portion () for outputting a speed reference by inputting a difference between a position reference and a position of the motor, a speed control portion () for inputting a difference between the speed reference and a speed of the motor, a torque control portion () for controlling a torque of the motor from a torque reference, and an inertia variation restraining portion () for outputting the torque reference by predicting a disturbance of the motor from the torque reference and the speed of the motor, the motor control apparatus further includes a phase compensating portion () for inputting the speed reference and inputting a speed advancing a phase to the speed control portion as a new speed reference, regards the torque of the motor generated by a deviation in a set value with regard to an actual moment of inertia as a disturbance and compensates for the disturbance by the inertia variation restraining portion () and the phase compensating portion ().

Motor control apparatus

A control constant adjusting apparatus in a control apparatus of a robot or a machine tool, etc. is disclosed. This control constant adjusting apparatus includes a speed control part (), an estimation part (), an identification part () and an adjustment part (). The identification part () makes identification of inertia J obtained from a ratio between a value |SFTr| in which an absolute value |FTr| of a value FTr obtained by passing a torque command Tref of the speed control part () through a predetermined high-pass filter is integrated with respect to time at a predetermined interval [a, b] and a value |SFTr'| in which an absolute value |Ftr&#x2032;| of a value FTr&#x2032; obtained by passing a model torque command Tref&#x2032; of the estimation part () through a predetermined high-pass filter is integrated with respect to time at the same interval only when a speed Vfb&#x2032; of a model in the estimation part () matches with a motor speed Vfb in the speed control part () at a value other than zero.

Control constant adjusting apparatus

A electric motor control device is provided for controlling an electric motor which actuates a movable member of a machine through a transmitting mechanism. When a torque command is given as motion command signal ( ) to servo device ( ), servo device ( ) sends input torque signal ( ) corresponding to motion command signal ( ) to electric motor ( ), which is energized. Movable member ( ) is thus moved, producing vibrations. Servo device ( ) outputs input torque signal ( ) equivalent to input torque signal ( ), and input torque signal ( ) and rotational speed signal ( ) are stored in memory device ( ). Analyzing device ( ) analyzes the frequencies of input torque signal ( ) and rotational speed signal ( ) according to an FFT, and outputs analytical result ( ).

Growing community of inventors

Fukuoka, Japan

Keisei Inoki