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:
Mar. 17, 2026
Filed:
May. 07, 2020
Inventio Ag, Hergiswil, CH;
Roman Hopp, Nuremberg, DE;
Thomas Eilinger, Küssnacht a/Rigi, CH;
INVENTIO AG, Hergiswil, CH;
Abstract
An elevator system drive includes: an electric machine: a first converter electrically connected to an alternating current source and the electric machine: a drive controller controlling the drive: a drive safety circuit unit electrically connected to a safety circuit of the elevator system, to a controller of the elevator system, and to the drive controller; and at least one mechanical brake that is closed by a brake closing command from the elevator system controller. The drive safety circuit unit operates in a first operating state wherein it transmits an emergency stop command coming from the elevator system safety circuit directly and without delay to the first converter, and operates in a second operating state wherein it relays a modified emergency stop command coming from the elevator system safety circuit, with a delay, to the first converter to ensure safe braking of the elevator system even if the mechanical brakes fail.