公开(公告)号：US20190277078A1

公开(公告)日：2019-09-12

申请号：US16297862

申请日：2019-03-11

Applicant: MAGNA CLOSURES INC.

Inventor： Samuel R. BARUCO ,  Faraz OSSAREH ,  Bill SHAW

IPC: E05F15/686

Abstract: A powered garage door opener in a door assembly including a shaft coupled to a pulley with a cable to lift a garage door with an electric motor coupled to the shaft, includes a braking circuit for regulating the speed of the shaft when it is not actively powered by the electric motor. The braking circuit includes a first switch to connect a first braking resistor across the electric motor to provide a first braking force. A braking controller monitors the speed of the garage door and selectively commands a second switch to close and to connect a second braking resistor and to thereby cause the electric motor to apply a second braking force significantly greater than the first braking force. A rectifier is connected across the first braking resistor to provide power to a motor drive controller using the induced voltage from the turning electric motor.