Omron Corporation

Satoshi Miyagawa

Hitoshi Fukuhara

Takeshi Kiribuchi

Hideto Hamabashiri

Shinya Yuasa

Sunao Takemura

Masaaki Yagi

The power conversion device includes an inverter circuit in which one or a plurality of current limitation circuits that limit an electric current flowing in each of legs are provided and a control unit that controls, when a target voltage or a target current of the inverter circuit is outside a predetermined range, the current limitation circuits such that the electric current flowing in each of the legs is not limited and alternately performs the ON/OFF control of the two switching elements of each of the legs with a dead time in between and controls, when the target voltage or the target current is within the predetermined range, the current limitation circuits such that the electric current flowing in each of the legs is limited and alternately performs the ON/OFF control the two switching elements of each of the legs of the inverter circuit without the dead time in between.

Power conversion device having an inverter circuit including current limitation circuits and a control circuit controlling same

Provided is a motor control device that can detect an abnormality of a motor at an early stage. A motor control device includes: a control unit that calculates a voltage command value based on an input current command value and controls drive of the motor by using the calculated voltage command value; a virtual motor unit that simulates the value of a current flowing through the motor, based on the voltage command value calculated by the control unit and a plurality of parameters related to specifications of the motor; and a determination unit that determines whether or not the motor is in an abnormal state by comparing the current command value input to the control unit and the current value simulated by the virtual motor unit.

Motor control device

The present invention easily inhibits an influence of a dead time on voltage control without requiring a user to consider a specific usage condition or the like of each motor control device. A control circuit () controls a step-down converter circuit () to step down a DC voltage to be applied to an inverter circuit () so that a duty of a PWM signal becomes greater than a dead time (Td).

A monitoring system has a plurality of monitoring terminals communicably connected to each other. Each monitoring terminal has an imaging portion for imaging a monitoring area allocated to an own-terminal, a tracing portion for processing an imaged image of the imaging portion and tracing a target person traveling in the monitoring area, a tracing information creation portion for creating tracing information associating the target person traced by the tracing portion with tracing start time, tracing stop time, and characteristic information of the target person, a tracing information storage portion for storing the tracing information created by the tracing information creation portion, and a tracing information notification portion for notifying the tracing information created by the tracing information creation portion to the other monitoring terminals.

Growing community of inventors

Kyoto, Japan

Satoshi Miyagawa