Honda Motor Co., Ltd.

Keisuke Urushihara

Shinobu Ochiai

Masayuki Arai

Keigo Andoh

An electric motor control system includes an inverter, an element temperature observation data acquiring device, a rotational speed upper limit setting device, and a rotational speed limiter. The inverter includes switching elements. The element temperature observation data acquiring device is configured to acquire element temperature observation data indicating an observation value of a temperature of the switching elements of the inverter. The rotational speed upper limit setting device is configured to set a rotational speed upper limit of an electric motor in accordance with the observation value of the temperature of the switching elements so as to satisfy a first condition that a voltage applicable to the switching elements in a case where the electric motor is operated at the rotational speed upper limit is lower than or equal to a withstand voltage of the switching elements.

Electric motor control system

An electric motor control apparatus suppressing power loss caused by driving an electric motor acting as a motor with a generated output of an electric motor acting as a generator. The electric motor control apparatus comprises a PAM controlled motor selecting unit () for determining which of 'control pattern 1' and 'control pattern 2' should be executed by comparison in total power loss, where a voltage control unit on the power generation side () performs voltage transformation with a PWM control in a first inverter () and generates a drive voltage for a second electric motor () with a PAM control in a second inverter () in the control pattern 1 and a voltage control unit on the driving side () outputs a rectified voltage from a generated voltage of a first electric motor () without voltage transformation in the first inverter () and generates a drive voltage for the second electric motor () with a PWM control in the second inverter () in the control pattern 2.

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Wako, Japan

Keisuke Urushihara