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:
Aug. 08, 2023
Filed:
Dec. 31, 2020
Trane International Inc., Davidson, NC (US);
Fredrik Boxberg, Espoo, FI;
Charles J. Peterson, La Crosse, WI (US);
Yubo Nian, La Crosse, WI (US);
Petri J. Mäki-Ontto, Espoo, FI;
Lauri Juhani Salmia, Espoo, FI;
Russell T. Abbott, Caledonia, MN (US);
Tomas Fajt, La Crosse, WI (US);
Seth M. McGill, Brookings, SD (US);
TRANE INTERNATIONAL INC., Davidson, NC (US);
Abstract
Permanent magnet rotors for electric motors, particularly electric motors for use in compressors, improve the electromagnetic efficiency of the motor. The rotors can include retention of surface permanent magnets using one or more of retaining features on the motor and/or pole spacers interfacing with corresponding features on a rotor core, the use of a monolithic magnet in the rotor, and/or use of a carbon fiber sleeve. The rotor can include an eddy current shield, disposed on the rotor core, on a surface of the rotor, or located within a sleeve surrounding the rotor. The rotor can be sized such that an air-gap between the rotor and a stator of a motor using the rotor is a predetermined amount that reduces electromagnetic losses such as eddy current losses.