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. 01, 2015
Filed:
Jun. 27, 2015
Dantam K. Rao, Schenectady, NY (US);
Dantam K. Rao, Schenectady, NY (US);
Other;
Abstract
The end windings in the stator and rotor are major sources of core-end heating in large electric machines. This invention discloses a Stealth End Winding that makes some of the end-turns within these end windings to be magnetically invisible or stealth in order to reduce the core-end heating. It employs permanent magnets in proximity of these end windings to flip the magnetic field of stealth end-turns, making them to point in a direction away from the core-end. This action reduces the magnetic field that hits the core-end, which in turn reduces core-end heating. A Stealth End Winding can potentially eliminate prevailing devices such as the flux shield, flux shunt, core-end stepping, slit-teeth etc that have been used so far to reduce the core-end heating. Elimination of core-end stepping reduces the field current thereby increase the efficiency and power rating. Elimination of flux shield reduces cost and cooling needs.