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:
Mar. 14, 2000
Filed:
Apr. 22, 1999
Ralf Hartramph, Waiblingen, DE;
Wolfgang Schinkothe, Stuttgart, DE;
Festo AG & Co, Esslingen, DE;
Abstract
An electromagnetic drive system having an integrated position signal generation for use by the drive windings for the movement and power generation and as a measuring system for determining the position of the movable partial system of the drive with respect to the stationary system, so that separate measuring systems are generated. The drive system including a stationary drive coil system of a direct current linear motor, having at least two identical partial coils which are serially connected with each other induced with a pulse length modulated control signal with a constant pulse frequency and a constant circuit voltage. For the position measurement, the impedance change in the partial coils of the coil system is picked up in accordance with the principle of an inductive voltage splitter by establishing the slopes of the electric voltage paths on the partial coils at a constant point in time after switching over the pulse length modulated control signal. By using the corresponding drive circuit for position sensing, this arrangement permits the structure of very compact positioning systems without any additional measuring systems.