Mitsumi Electric Company Ltd.

Shu Hayashi

Masato Aoki

Makio Abe

Takatoshi Itagaki

A motor control circuit includes a control circuit configured to output a pulse width modulation signal for controlling a switching operation of an inverter circuit, the inverter circuit being configured to supply an alternating current power to a motor, and includes a speed-change detecting circuit configured to detect a change in a speed command signal and, output, in response to the change meeting and exceeding a predetermined limit, a signal indicating that the speed command signal has changed to the control circuit to cause the control circuit to change a duty cycle of the pulse width modulation signal, the speed command signal specifying a target value of a rotational speed of the motor.

Motor control circuit and motor controller

A motor control circuit includes a control circuit configured to control a switching operation of an inverter circuit, the inverter circuit being configured to supply an alternating current power to a motor, and includes a determination-information generating circuit configured to generate at least one determination value that conveys information on whether the motor malfunctions or deteriorates. The motor control circuit includes a determination circuit configured to determine whether the motor malfunctions or deteriorates based on the determination value to output, as an interrupt signal, a signal indicating that the motor malfunctions or deteriorates to the control circuit.

Growing community of inventors

Tokyo, Japan

Shu Hayashi