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:
May. 18, 2004
Filed:
Oct. 25, 2002
Erkki Lantto, Helsinki, FI;
High Speed Tech Oy Ltd., Espoo, FI;
Abstract
A method for determining the position of the rotor ( ) of an electric machine in the radial direction (X, Y) and in the axial direction (Z) applies a cogged ring ( ), through which the shaft ( ) of the rotor ( ) is placed. The shaft ( ) is provided with an auxiliary ring ( ) placed substantially at the cogged ring ( ). The cogged ring is provided with at least three sets of cogs, wherein the cogs of the first set ( ) are used to measure the movement of the shaft ( ) in the radial direction (X, Y), the cogs of the second ( ) and third ( ) sets are used to measure the movement of the shaft ( ) in the axial direction (Z), and that the cogs of the second ( ) and third ( ) sets are placed, in the axial direction (Z), at least partly in a different location in relation to each other.