Kabushiki Kaisha Yaskawa Denki

Toshihiro Sawa

Mitsujiro Sawamura

Eiji Yamamoto

Tsuneo Joe Kume

Sumitoshi Sonoda

Kenji Yamada

Katsutoshi Yamanaka

Hidenori Hara

Kozo Ide

Takehiko Komiya

Sadao Ishii

Michihiko Zenke

Jun Oyama

Masanobu Miyazato

Syuuichi Fujii

Toshiyuki Osuga

Koichi Hirano

Xiaorong Xia

Eijiro Tajima

Tuneo Kume

To be able to restrain a height of a machine even when the machine is large-sized and smoothly move a table in XY&#x3b8; directions. An alignment apparatus includes two translational freedom degree guide portion (), one rotational freedom degree guide portion (), a translational drive/translational/rotational freedom degree mechanism module () including a linear motor provided at one of the translational freedom degree guide portion (), a machine base portion (), a reference generator portion (), a two-dimensional position sensor (), a calculating portion of compensation value (). At least three of the translational drive/translational/rotational freedom degree mechanism modules () are uniformly arranged to a table ().

Alignment apparatus

A control device is provided for a synchronous motor, which drives the synchronous motor through a voltage operated PWM inverter and controls a torque and a speed of the motor, including a unit for causing a PWM carrier signal to have an arbitrary phase difference between two phases such UV, VW, or WU in three phases of U, V, and W, a unit for extracting a high frequency voltage and a high frequency current, which are thus generated from a detecting voltage or a command voltage and a detecting current, and a unit for estimating a position of a magnetic flux or position of a magnetic pole by using the high frequency voltage and the high frequency current which are excited.

Control device for synchronous motor

A protection apparatus and a protection method of a PWM cycloconverter wherein when the PWM cycloconverter is shut off, a surge voltage or an overcurrent is not produced on the output side are provided. A protection apparatus of a PWM cycloconverter is made up of fault detection means for detecting a fault of the PWM cycloconverter, operation stop means for turning off at least some of the uni-directional semiconductor switches to of the PWM cycloconverter if a fault signal occurs, continuous flow means for allowing a load current of the PWM cycloconverter to continuously flow if at least some output phases of the PWM cycloconverter become open, and protection switching means for turning on and off the unidirectional semiconductor switches of the PWM cycloconverter based on the fault signal output from the fault detection means.

Protection apparatus and protection method of PWM cycloconverter

Multiplex pulse-width modulation power converter

Power converting apparatus and method using a multiple three-phase PWM

Bridge type power converter

Method of starting a permanent-magnet synchronous motor equipped with

An inverter driving method for has an arrangement polyphase induction motor, for altering a plurality of winding connections of the motor and a storage arrangement for a plurality of motor control constant groups preset corresponding to the respective winding connections so as to perform optimal vector control. When the classification of the winding connection is selected, one set of motor control constant groups corresponding to the winding connection is read out of the storage arrangement and applied to a control unit of the induction motor as control constants.

Inverter driving method for induction motors

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Fukuoka, Japan

Toshihiro Sawa