The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 24, 2018
Filed:
Sep. 20, 2016
Kone Corporation, Helsinki, FI;
KONE CORPORATION, Helsinki, FI;
Abstract
An elevator includes an elevator car and lifting machinery including a traction sheave, an electromechanical machinery brake, and an electric motor having a rotor. The traction sheave, the electromechanical machinery brake and the rotor of the electric motor are connected via a shaft, whereby the lifting machinery moves the elevator car upwards and downwards in a vertically extending elevator shaft controlled by a main control unit. The direction of rotation and the rotation speed of the rotor of the electric motor is detected with a sensor, the amplitude of the brake current provided to the machinery brake is measured, the amplitude of the brake current is increased until a first moment when the shaft and thereby also the rotor of the electric motor starts to rotate, which is detected by the sensor, the brake current is disconnected momentarily at the first moment, the torque acting on the shaft and the corresponding load in the elevator car at the first moment is determined based on the measured amplitude of the brake current at the first moment, whereby said torque is used in the main control unit for controlling the lifting machinery.