Mitsubishi Electric Corporation

Hiroshi Sugie

Takayuki Nakagawa

Takashi Okamuro

Shuya Sano

Hirokazu Sakuma

Yuichi Nagata

Daisuke Koyama

Hiroyuki Takeda

Masahiro Ougiwari

The present invention includes drive unitsandthat change a relative position between a wire electrodeand a workpieceby moving a position of wire guideand, drive control unitsandthat drive the drive unitsandbased on a machining shape on the workpiece, respectively, a correction-amount storage unitthat previously stores therein a position correction amount for the wire electrodecorresponding to a machining condition, a correction-amount reading unitthat reads the position correction amount corresponding to the machining condition from the correction-amount storage unit, and a wire-position correction unitthat causes the drive control unitsandto correct a relative distance between the wire electrodeand the workpiecebased on the read position correction amount.

Wire electric discharge machining apparatus and control device

A motor drive device in embodiments includes: a motor drive unit that generates a current for driving a motor on a basis of a position command and a position detection value of the motor; a motor-coil ambient-temperature estimation unit that calculates a motor-coil ambient-temperature estimation value by correcting an output value of a temperature sensor provided in a peripheral portion of a motor coil of the motor by using a filter including both a phase-lead characteristic and a low-pass characteristic; a motor-coil increased-temperature estimation unit that calculates a motor-coil increased-temperature estimation value on a basis of the current; and a motor-coil protection unit that limits the current on a basis of the motor-coil ambient-temperature estimation value and the motor-coil increased-temperature estimation value.

Motor drive device

An upper-level control device includes a communication control unit that transmits a command, which is used after a command that is currently executed and includes an execution order, to an electric motor control device during electric motor control devices respectively perform driving controls of electric motors, and each of the electric motor control devices includes a command storage unit configured to store a plurality of commands, a communication control unit that stores the command received from the upper-level control device in the command storage unit in the execution order, and a command-follow-up control unit that performs a follow-up control of the electric motors based on the command. When the command storage unit is fully filled with the commands, the communication control unit stores a newly received command in the command storage unit by overwriting the newly received command in an area where an executed command is stored.

Electric motor control system and communication method

A position detection error correcting method that corrects position detection errors using a limited storage capacity, by calculating position detection error correction values by four simple arithmetic operations at startup to reduce a startup time delay and consumption of a storage capacity even when a portion containing steep error variations exists. Detection error correction values of a position detector are expressed by a correction function using a periodic function, and correction parameters of the correction values are stored in advance in a non-volatile memory. At startup, these correction parameters are read out, and a position detection error correction value corresponding to each detected position is calculated and stored in a random access memory. The output position detection error correction value detector corresponding to each detected position is read out from the random access memory and a corrected detected position value corrected for the detected position value error is calculated.

Growing community of inventors

Chiyoda-ku, Japan

Hiroshi Sugie