Nsk Corporation

Keiji Kashimoto

Seiichi Kobayashi

Shigeru Endo

Shin Kumagai

Hideaki Kawada

Takaaki Sekine

Shigeo Shinohara

Takeshi Senba

Atsushi Ooshima

Tetsuya Kodama

Atsushi Horikoshi

Tamotsu Oumi

Yasuhiro Shimizu

Haruhiko Kamiguchi

Satoh Kouichi

Naoki Hyoudou

Mitsuo Shimoda

Masayuki Aoki

An electric power steering apparatus for generating a PWM signal based on a calculated steering assist command value, PWM-controlling a motor via a motor drive circuit including switching elements, and assist-controlling a steering system that a motor relay is inserted between the motor drive circuit and the motor, includes a steering status detecting section that detects a steering status of a steering wheel, outputs a longtime steering holding signal when detecting that the steering status is a longtime steering holding status, and outputs a normal steering signal when detecting that the steering status is a normal steering status, and a motor current control section that determines a motor current control value for controlling a motor current flowing in the motor relay in accordance with the longtime steering holding signal or the normal steering signal.

Electric power steering apparatus

A motor control apparatus includes a steering column having inserted therein a steering shaft to which steering torque is transmitted, a reduction gear box coupled to the steering shaft, and an electric motor that transmits a steering assisting force to the steering shaft via a reduction mechanism in the reduction gear box. The electric motor and its control unit including a control board mounted with a control circuit, are provided side by side in the reduction gear box. A connection terminal of the electric motor is electrically connected to the control unit directly. This minimizes a connection distance between the control unit and the electric motor.

Electric power steering apparatus and method of assembling the same

To provide an electric power steering apparatus in which it is possible to reduce a size of the entire structure of a control unit while sufficiently showing a heat radiation effect of heat generating members. The electric power steering apparatus includes a steering columnhaving inserted therein a steering shaftto which steering torque is transmitted, a reduction gear boxcoupled to the steering shaft, and an electric motorthat transmits a steering assisting force to the steering shaftvia a reduction mechanism in the reduction gear box. In the reduction gear box, a motor mounting sectionfor mounting the electric motoris formed at an end face in a direction perpendicular to an axis of the steering shaftand a control-unit mounting sectionfor mounting a control unitfor controlling to drive the electric motoris formed near the motor mounting section

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Maebashi, Japan

Keiji Kashimoto