US Patent Issued to Otis Elevator on Sept. 22 for "Elevator machine braking" (Connecticut Inventor)

ALEXANDRIA, Va., Sept. 24 -- United States Patent no. 12,744,477, issued on Sept. 22, was assigned to Otis Elevator Co. (Farmington, Conn.).

"Elevator machine braking" was invented by Prasanna Nagarajan (Farmington, Conn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "An elevator machine assembly includes a motor and an elevator drive configured to control power supply to the motor. The elevator drive includes at least a plurality of converter switches and an energy storage device that is situated to be charged in response to the motor generating a back emf as the motor rotates in response to a torque applied to the motor when the elevator drive is not providing power to the motor. A short-circuiting module ...