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. 09, 2003
Filed:
Feb. 11, 2002
Thord Agne Gustaf Nilson, Tyresö, SE;
InMotion Technologies Aktiebolag, Stockholm, SE;
Abstract
A rotor for a high speed permanent magnet motor comprises a central spindle ( ), and a plurality of magnet discs ( ) stacked on the spindle ( ) and axially clamped by a clamping device ( ) on the spindle ( ) to form an axially pre-tensioned disc packet core ( ). Each magnet disc ( ) has at least one electrically insulating layer, and a reinforcement disc ( ) is provided between the magnet discs ( ) and/or between at least one of the magnet discs ( ) and the clamping device ( ). The reinforcement discs ( ) are clamped such that a clamping force generated frictional engagement is obtained between the reinforcement discs ( ) and the magnet discs ( ) by which centrifugal forces are transferred from the magnet discs ( ) to the reinforcement discs ( ) during motor operation, thereby relieving the magnet discs ( ) of tensile stress.