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. 28, 2009
Filed:
Dec. 12, 2007
Reinhardt L. Willig, Maynard, MA (US);
Donald C. Fyler, Needham, MA (US);
William P. Kelleher, Acton, MA (US);
Reinhardt L. Willig, Maynard, MA (US);
Donald C. Fyler, Needham, MA (US);
William P. Kelleher, Acton, MA (US);
United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A hysteresis-start permanent magnet rotor having a non-magnetic rotor shaft, a permanent magnet rigidly attached to a center portion of the non-magnetic rotor shaft, a non-magnetic spacer on each side of the permanent magnet, each non-magnetic spacer rigidly attached to the non-magnetic rotor shaft, to form a non-magnetic spacer-permanent magnet-non-magnetic spacer combination, a hysteresis ring on each side of the non-magnetic spacer-permanent magnet-non-magnetic spacer combination, each hysteresis ring being rigidly attached to the non-magnetic rotor shaft. A stator-segment is around each of the hysteresis rings and a stator-segment is around the permanent magnet, each stator-segment separated from a next stator-segment by a non-magnetic spacer.