| 摘要 |
An automatically-openable-and-closable-door operating apparatus uses a capacitor torque motor in order to automatically open or close the door. When opening or closing the door, an exciting coil of the motor is first short-circuited as the door approaches the open or close terminal so that the motor undergoes a dynamic braking to absorb an inertia of the door and to decelerate the door. Thereafter the short-circuiting or connection and the disconnection across the exciting coil are repeated alternately to have the motor produce a driving force and a braking force alternately so that the door may be brought into its opening or closing terminal position at a low speed without accompanied by shocks.
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