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. 17, 2002
Filed:
Jul. 30, 2001
Guenter Schwesig, Erlangen, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
The present invention makes possible a safety function for speed monitoring in the case of all induction machines operated on an inverter without a sensor system, in that a determined setpoint stator frequency value (&phgr; *) is limited and monitored in a two-channel mode in two systems with approximate redundancy, deriving from this in each system respective sets of control signals for the electrical valves of the inverter, which can be compared with one another in two systems of monitoring electronics. In the event of fault detection, two-channel switching off takes place. The circuit arrangement according to the invention can additionally be subjected to enforced dynamization.