Patent ID: 9562385
Date: 2017-02-07
CPC Classifications: E05F,E05Y,F16H,H02P

Claim:
1. A door operator system comprising an electric motor having an output shaft, a current-time position detecting device and a winding shaft for winding or unwinding a movable barrier, the output shaft of the electric motor being coupled to the winding shaft, wherein the current-time position detecting device comprises: a first gear coupled to the output shaft of the electric motor or the winding shaft; a first angular position sensing unit provided for detecting a first angular position of the first gear; a revolution counting unit for counting a number of revolutions of the first gear; and an arithmetic unit electrically connected to both of the first angular position sensing unit and the revolution counting unit, the arithmetic unit receiving the first angular position from the first angular position sensing unit and the number of revolutions from the revolution counting unit and calculating a number of total circumferential intervals of the output shaft of the electric motor or the winding shaft based on: where D is the number of the total circumferential intervals of the output shaft of the electric motor or the winding shaft, La is the number of revolutions of the first gear, A is the first angular position, and X is a number of circumferential intervals per revolution of the first gear.