Omron Corporation

Hitoshi Fukuhara

Yasushi Ono

Satoshi Miyagawa

Mamoru Egi

Takeshi Kiribuchi

Masahito Tanaka

Sota Kaida

A servo system including a control device and multiple servo drivers reduces noise resulting from switching. The servo system includes a control device and multiple servo drivers. Each servo driver includes a servo signal generator, a PWM calculator that generates a PWM control signal with a pulse being modulated, and an inverter. The PWM calculator performs a first process of generating, using a predetermined parameter set based on a circuit structure including the servo driver and the corresponding motor, a superimposed signal to be superimposed on the command signal, and the superimposed signal differs for each of control axes corresponding to the respective plurality of motors when the command signal is in a low voltage range. The PWM calculator performs a second process of generating the PWM control signal by adding the superimposed signal to the command signal and by comparing a resulting signal with a predetermined carrier signal.

Servo system

A processing apparatus acquires a first rise transition that is a rise transition of the temperature of a winding and a second rise transition that is a rise transition of the temperature detected by a temperature sensor in a state where voltage application for raising the temperature of the winding to a predetermined temperature is performed, determines a predetermined temperature characteristic model by calculating a predetermined parameter on the basis of the second rise transition, and further determines a winding temperature characteristic model by calculating a winding related parameter on the basis of the first rise transition.

Processing device, and determination method for winding temperature calculation model

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.

Growing community of inventors

Ritto, Japan

Hitoshi Fukuhara