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:
Sep. 20, 2011
Filed:
Jan. 31, 2007
Thomas Hoppe, Altdorf, DE;
Thomas Hoppe, Altdorf, DE;
Siemens Aktiengesellschaft, München, DE;
Abstract
Electric machines which are excited with permanent magnets are to be improved in terms of their smoothness of operation and their loss properties. For this purpose, an electric machine is proposed comprising a first active part () on which one electric magnet () and at least one permanent magnet () are mounted, and a second active part () which has a multiplicity of pole teeth () and which interacts magnetically with the first active part (). The pole teeth () are spaced apart from one another in a non-uniform fashion in the direction () of the movement of the electric machine and/or have different average widths from one another, with the respective width of a tooth being measured in the direction () of movement and being averaged in terms of the extent of the tooth in the transverse direction with respect to the direction of travel. The geometry of the tooth causes the harmonics of the magnetic field to be influenced in a selective fashion. The second active part can be implemented cost-effectively as, for example, a simple punched sheet-metal part.