Hitachi, Ltd.

Yuuki Ejiri

Tomoo Ito

Hiroshi Kamifuji

Hisato Tsuruta

A torque motor including a housing, a shaft member extending through the housing and supported by bearings, a stationary core in the housing and at least one coil fixed to the shaft member and arranged for rotation with respect to the stationary core within a finite range. Magnets are fixed to the housing for imparting rotational force to the coil and support members are provided in the housing for fixedly supporting the stationary core. The coil is provided with oppositely disposed free ends and extends across the stationary core between the free ends such that each of the free ends projects beyond an outer peripheral surface of the stationary core without contacting the stationary core. The support members include at least two plate members on opposite sides of the shaft member, the magnets being within the housing at portions other than where the support members are disposed.

Torque motor having a coil with finite turning range

An apparatus for controlling an opening degree of a throttle valve comprises a motor including a rotor, a detector for detecting the opening degree of the throttle valve, and a control unit for outputting a command to the motor so as to swing the throttle valve to the desired opening degree which is determined by the control unit in accordance with the information representing the engine condition. The apparatus further comprises a one-piece shaft which includes a throttle valve shaft and an output shaft of the rotor of the motor.

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Katsuta, Japan

Yuuki Ejiri