Door i.e. revolving door, has brake arm generating voltage between base and emitter of transistor over closing movement of revolving door wing of generator by switching on and off of electromotor

摘要

The door has an electric motor (2) whose shaft is operatively connected with a door. The electric motor is operated as a generator in the movement of the door. A transistor is arranged to control or regulate an output voltage dependent on a braking force. A stable multivibrator (V1) is adapted for controlling output voltage regulation in a brake electric circuit (3) of a brake gear (1). A brake arm (4) generates voltage between a base and an emitter of a transistor (T1) over a closing movement of a revolving door wing of the generator by switching on and off of an electromotor.