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. 12, 2020
Filed:
Aug. 21, 2018
Baldor Electric Company, Fort Smith, AR (US);
Robert F. McElveen, Anderson, SC (US);
Richard J. Budzynski, Simpsonville, SC (US);
Baldor Electric Company, Fort Smith, AR (US);
Abstract
A rotor for an LSIPM comprises a plurality of permanent magnets defining a number of poles ('P') of the LSIPM, and a plurality of rotor bars spaced about the rotor defining a rotor bar area ('BA'). The rotor bars are formed of a conductive material having an associated conductivity (“σ”). End members are disposed on axial opposite ends of the rotor core. The end members are in electrical contact with the rotor bars. The end members are formed from a material having an associated conductivity (“σ”). Each end ring member has a minimum geometric cross sectional area (“ERA”) and outer diameter that generally corresponds to the rotor core outer diameter. The ERA is greater than 0.5 times the rotor bar area per the number of poles (BA/P) times a ratio of the rotor bar material conductivity to the end member material conductivity (σ/σ).