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:
Dec. 03, 2013
Filed:
Dec. 08, 2009
Panu Kurronen, Lappeenranta, FI;
Panu Kurronen, Lappeenranta, FI;
The Switch Drive Systems Oy, Lappeenranta, FI;
Abstract
A permanent magnet module for a rotor of a permanent magnet electrical machine is presented. The permanent magnet module comprises: a stack of ferromagnetic steel sheets () having a groove in the direction perpendicular to the ferromagnetic steel sheets, and a permanent magnet () located in the groove and arranged to produce magnetic flux that penetrates a surface () of the stack of ferromagnetic steel sheets. The surface has a shape suitable for forming a desired magnetic flux density distribution into an air-gap of the permanent magnet electrical machine. The permanent magnet module further comprises a base-plate () made of solid ferromagnetic steel. The base plate is located at an opening () of the groove and constitutes together with the groove an aperture in which the permanent magnet is located.