Nidec Corporation

Nidec Elesys Corporation

Fujimori Kogyo Co., Ltd.

Eiji Wada

Kazuki Harada

Naoki Hayashi

Toshiyuki Takeda

Tokuji Tatewaki

Hiromitsu Ohashi

Takashi Kitamura

Kaori Nabeshi

Osamu Maeshima

Hitoshi Kuroyanagi

Masatoshi Matsuzaki

Naoshi Itagaki

Teizo Sugimoto

Hiroshi Kimura

Shiro Yamamoto

A power conversion device may include a first inverter to which one end of each phase winding of a motor is coupled, a second inverter to which the other end of each phase winding is coupled, and a switch circuit having at least one of a first switch element that switches between connection and disconnection of the first inverter to and from a ground, a first protection circuit being coupled in parallel to the first switch element, and a second switch element that switches between connection and disconnection of the second inverter to and from the ground, a second protection circuit being coupled in parallel to the second switch element.

Power conversion device, motor drive unit, and electric power steering device

A power conversion device may include a first inverter to which a first end of each phase winding of the electric motor is coupled; a second inverter to which a second end of each phase winding is coupled; a first phase isolation relay circuit structured to switch between connection and disconnection of the one end of each phase winding to and from the first inverter; and a first neutral point relay circuit to which the one end of each phase winding is coupled and which is structured to switch between connection and disconnection of the one end of each phase winding to and from the one end of each other phase winding.

Power conversion device, motor drive unit, electric power steering device, and relay module

A power conversion device includes a first inverter connected to first ends of windings of each phase of a motor, a second inverter connected to second ends of the windings of each phase, a phase separation relay circuit to switch between connection and disconnection between the first ends of the windings of each phase and the first inverter, a neutral point relay circuit connected to the first ends of the windings of each phase and to switch between connection and disconnection between the first ends of the windings of each phase, a first switching element to switch between connection and disconnection between the second inverter and a power supply, and a second switching element to switch between connection and disconnection between the second inverter and a ground.

A vehicle-mounted electronic controller includes a motor case that accommodates an electric motor, a lid body of the motor case, power circuitry including switching circuits that supply driving signals to the electric motor, and control circuitry including a control circuit that controls the switching circuits. The case further accommodates the power circuitry and the control circuitry. The lower surface of the lid body contacts the power circuitry. Each of the case and the lid body has a heat radiation property. The upper surface of the lid body is exposed. A vehicle-mounted mechanically/electrically integrated electric motor includes the vehicle-mounted electronic controller and the electric motor.

Vehicle-mounted electronic control unit and vehicle-mounted mechanically/electrically integrated electric motor

A power conversion device according to an embodiment of the present invention includes a first inverter to which one end of each of n phase windings (n is an integer of three or more) included in an electric motor is coupled, a second inverter to which the other end of each phase winding is coupled, and a switch circuit having at least one of: a first switch element that switches between connection and disconnection of the first inverter and ground, and a second switch element that switches between connection and disconnection of the second inverter and ground.

A power conversion device may include a first inverter to which a first end of each phase winding is coupled; a second inverter to which a second end of each phase winding is coupled; a plurality of switching elements provided in the first and second inverters; a control circuit structured to perform n-phase conduction control on the first and second inverters; and a detection circuit structured to detect a failure in the switching elements. The control circuit is structured such that, when the detection circuit has detected a failure in any of the plurality of switching elements, the control circuit changes the control of the first and second inverters from the n-phase conduction control to m-phase conduction control using m phases of the n phases different from the phase of a winding coupled to the failed switching element, m being an integer not smaller than two and smaller than n.

An electronic control apparatus configured to control electric power steering and provided integrally with an electric motor is electrically connected to an ignition switch and which assists a rotation operation of a steering column by rotation of the electric motor. A first magnetism detecting element configured to operate using power supplied via the ignition switch to output a first set of rotation angle signals of the electric motor. A second magnetism detecting element configured to operate continuously using continuously supplied power to output a second set of rotation angle signals of the electric motor. A controller configured or programmed to generate rotation angle information about the electric motor based on the first set of rotation angle signals and the second set of rotation angle signals outputted while the ignition switch is stopped and to calculate a position of a steering wheel from the generated rotation angle information.

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Kawasaki, Japan

Eiji Wada