Automatically-openable-and-closable-door operating apparatus

Details Automatically-openable-and-closable-door operating apparatus Automatically-openable-and-closable-door operating apparatus

1977-09-15

1979-03-20

Hohauser, Herman

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

318266, 318282, H02P 736

Patent

active

041456416

ABSTRACT:
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.

REFERENCES:
patent: 3264543 (1966-08-01), Yoshida
patent: 3344327 (1967-09-01), Hutchinson et al.
patent: 3673482 (1972-06-01), Davey

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