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:
Jan. 17, 2012
Filed:
Mar. 27, 2007
Ian Bird-radolovic, Västerås, SE;
Peter Eriksson, Västerås, SE;
Ian Bird-Radolovic, Västerås, SE;
Peter Eriksson, Västerås, SE;
ABB AB, Västerås, SE;
Abstract
A control system for controlling an industrial robot and a method thereof. A control unit generates a control signal for controlling the motor. At least one drive unit controls the motor. The drive unit includes a switching unit adapted to convert DC current to alternating current to the motor in dependence on the control signal. A safety unit generates a stop signal for stopping the robot upon occurrence of a safety event. The drive unit disables the switching unit upon receiving the stop signal. The safety unit generates the stop signal with a time delay with respect to the safety event. The control unit generates the control signal in such a way that the motor is electrically braked during the time delay. The control system transfers the stop signal to the brake, which mechanically brakes the motor upon receiving the stop signal, and delays the stop signal to the drive unit so that the brake receives the stop signal before the drive unit to ensure that the mechanical brake is applied before the switching unit is disabled.