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:
Jun. 19, 2007
Filed:
Aug. 26, 2004
Bernd Sieber, Siegsdorf, DE;
Günter Oedl, Salzburg, AT;
Bernd Sieber, Siegsdorf, DE;
Günter Oedl, Salzburg, AT;
Bruckner Maschinenbau GmbH, Siegsdorf, DE;
Abstract
The invention relates to a method and to a circuit arrangement used to regulate synchronous linear motors, especially linear drive mechanisms in film drawing systems. The force (F) between the stationary primary part and the moved secondary part is determined in a sensorless manner from the voltages and currents calculated and measured in a frequency converter in a functional block, in such a manner that the integral is calculated from the active power during a time period (t) between two pulses (new) produced by an overriding control and said integral is divided by the active length (1) of the primary part. Alternatively, the force (F) can also be determined by summation of the voltages in the f-axis in order to reduce the drop in voltage in relation to the resistance (R) of the branch in the primary part. Voltages and currents are transformed on the primary part by a co-ordinate system related to the secondary part.