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:
Apr. 19, 2011
Filed:
Aug. 09, 2007
Thomas Hoppe, Lemgo, DE;
Thomas Hoppe, Lemgo, DE;
Siemens Aktiengesellschaft, München, DE;
Abstract
An electric motor with a magnet free main drive component, as stator or secondary part, having a measuring system for determining positions and directions with increased resolution is proposed. Said electric motor comprises a first engine part (), being moveable in relation to a second engine part (). A number of magnetic field sensor devices () of the measuring system are attached on the first engine part (), being separated from each other along the direction of movement. The second engine part () comprises magnet free pole-teeth (), being also separated from each other along the direction of movement. Each of the magnetic field sensor devices () has at least one magnet, the magnetic field thereof being directed through one of the pole-teeth () for detection by a sensor of the magnetic field sensor device. The space between each two of the magnetic field sensor device () is different to the space between each two of the pole-teeth (). Thus, refined determination of the position, for example with a synchronous linear motor with permanent magnet free secondary part can be achieved.