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. 02, 2004
Filed:
Mar. 14, 2001
Ralf Hartramph, Albershausen, DE;
Festo AG & Co., Esslingen, DE;
Abstract
A direct electrodynamic linear drive comprising a drive coil system composed of coils arranged in a row alongside each other on an elongated ferromagnetic core, which coil is able to be supplied with a switched exciting voltage. The drive coil system has a ferromagnetic tube fitting around it, on whose inner side a plurality of permanent magnets are arranged in a row in the longitudinal direction of the tube. The core provided with the drive coil system is adapted to function as a stator and the tube having the permanent magnets as an armature. In this arrangement the ferromagnetic tube serves as a guide tube, as a magnetic return member and as a holder means for the permanent magnets, the possibility of a simple and accurate longitudinal guiding of the tube meaning that elongated units with a small cross section may be manufactured.