Mitsubishi Electric Corporation

Akihiro Sawada

Makoto Matsumoto

Hiroki Uchida

Takaaki Tanaka

Naoki Itoi

Yuichi Muramoto

Hisakazu Yamane

Fumino Suzuki

An electric motor control device includes a current detection unit, an interface unit, a switching unit, and an arithmetic processing unit. A detection signal of a current detected by the current detection unit is input to the interface unit. The interface unit includes a plurality of filters having time constants different from one another, and performs filtering processing on the detection signal. The switching unit controls power supplied to an electric motor. The arithmetic processing unit uses, as a selected filter, a filter selected from among the plurality of filters based on the length of a control pulse. The arithmetic processing unit uses, as a detected current value, a value obtained by A/D conversion of a processed signal that is the detection signal on which the filtering processing has been performed with the selected filter.

Electric motor control device

Provided is a motor control apparatus that suppresses a steep rush current to a charging circuit and that can quickly start driving of a motor without depending on a current-limiting resistor. The motor control apparatus according to the present disclosure includes an inverter for driving a motor, a charging circuit for supplying electric power to the inverter, a relay circuit for connecting a charging circuit and a power supply terminal, a control unit for controlling the inverter and the relay circuit, and a pre-charging circuit that is provided in parallel with the relay circuit, that starts charging from the power supply terminal to the charging circuit after a power switch for connecting an external power source with the power supply terminal is turned on, and that completes charging of the charging circuit before the control unit starts operation thereof.

Motor control apparatus

Dew condensation in a housing of an inverter device can be prevented. The inverter device includes: a housing accommodating a power electronic element and an electrolytic capacitor; an opening formed in the housing; a thermal insulator disposed along a periphery of the opening; and a water jacket having a body portion, and a flow-in pipe and a discharge pipe for cooling water, the water jacket being disposed such that a first surface of the body portion closes the opening from an outside of the housing, with the thermal insulator interposed therebetween. The power electronic element is mounted on the first surface of the body portion, and the electrolytic capacitor is mounted in the housing so as to be in contact with an inner surface of the housing.

Inverter device

A voltage control unit is configured to: control, in accordance with an output voltage signal and an output current signal, output power of a rectifying unit to a voltage lower than a voltage by which an amount of generated power of a magneto AC generator becomes maximum; control a transformation ratio in accordance with the output voltage signal and the output current signal so as to improve power generation efficiency of the magneto AC generator one of when an rpm variation signal indicates an decelerating state and when the rpm variation signal indicates that a variation in rpm indicates a value smaller than a predetermined constant; and control the transformation ratio so as to decrease the output power of the rectifying unit when the rpm variation signal indicates an accelerating state.

Growing community of inventors

Tokyo, Japan

Akihiro Sawada