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:
Dec. 31, 2013
Filed:
Jul. 31, 2012
Sönke Kock, Schriesheim, DE;
Jens Hofschulte, Lehrte, DE;
Sönke Kock, Schriesheim, DE;
Jens Hofschulte, Lehrte, DE;
ABB AG, Mannheim, DE;
Abstract
A method and system are disclosed for heating of robots in cold environments, whereby the robot possesses permanent magnet brushless or three-phase synchronous motors with three motor phases including three stator coils (L, L, L) connected to an inverter controllable by a control-unit and with a rotor with permanent magnet excitation. A current can be applied to at least one phase of the stator coil (L, L, L) of the motor such that, if the motor stands still, a directed magnetic flux (Φ) is created which interacts with the permanent magnets of the rotor in such a way that the resulting torque will be close to zero.