ALEXANDRIA, Va., June 5 -- United States Patent no. 12,278,527, issued on April 15, was assigned to Innomotics GmbH (Numberg, Germany).
"Cage rotor and method for the production thereof" was invented by Klaus Buttner (Hollstadt, Germany), Klaus Kirchner (Ostheim, Germany) and Matthias Warmuth (Windshausen, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A conductor bar of a cage rotor of an asynchronous machine has a longitudinal extension and includes first and second sections in the longitudinal extension. The first section has a hardness which is lower than a hardness of the second section and is realized through soft annealing, brief inductive heating or heating by a flame so as to enable a compre...