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:
Feb. 23, 2021
Filed:
Jul. 10, 2017
Vetco Gray Scandinavia As, Sandvika, NO;
Terje Hjertvikrem, Stavanger, NO;
Vetco Gray Scandinavia AS, Sandvika, NO;
Abstract
A control system is disclosed for an electric actuator comprising an electric motor, an external supply of electric energy, an energy storage device and a first motor control module which controls the supply of energy to the motor in normal operation. A second motor control module controls the supply of energy to the motor in fail-safe mode. The first motor control module and the second motor control module are connected in parallel via a fail-safe switch which is arranged to override the control executed by the first motor control module to set the control system in fail-safe mode by activation of the second motor control module in either case of: the energy level in the energy storage device reaching, or falling below, a predetermined value, or failure in the external energy supply, or in response to an operator command. A method of controlling an electric actuator in a control system is also disclosed.