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:
Feb. 11, 2003
Filed:
May. 10, 2001
Norbert Coenen, Mönchengladbach, DE;
W. Schlafhorst AG & Co., , DE;
Abstract
A method of operating an open-end spinning device ( ) whose spinning rotor ( ) is supported with its rotor shaft ( ) radially and axially positioned via a magnetic bearing arrangement ( ) which comprises two magnetic bearings with spaced permanent magnet pairs ( and ), a central position control device ( ) with actor coils ( ), and a rotor position sensor ( ). An output signal (ASLS) of the position sensor ( ) is processed in the central position control device ( ) such that a coil current (i) initiated by a controller ( ) is initially regulated toward zero by negative feedback of an integrator ( ). A positive feedback of the coil current (i) subsequently takes place by negation of the input signal (ESI) of the integrator to at least intermittently increase the coil current (i) in the actor coils ( ) and thereby lift and transfer the spinning rotor ( ) from its axial catch bearing ( ) into its operating position wherein the coil current (i) is regulated back toward zero in the actor coils ( ).