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:
Sep. 26, 2017
Filed:
Aug. 02, 2016
GM Global Technology Operations Llc, Detroit, MI (US);
Xin Jing, Rochester, MI (US);
Brian A. Welchko, Oakland, MI (US);
Constantin C. Stancu, Auburn Hills, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
An electric machine assembly includes an electric machine, an inverter configured to provide pulse-width modulation characterized by a switching frequency and a controller. The controller has a processor and tangible, non-transitory memory on which is recorded instructions for executing a method of controlling the switching frequency to minimize a beat frequency phenomenon. Execution of the instructions by the processor causes the controller to obtain a first function (G) and a second function (G) based at least partially on the original pulse ratio (PR). The original pulse ratio (PR) is a ratio of the switching frequency and a predefined fundamental frequency. If each of a plurality of conditions are met, a new pulse ratio (PR) is determined based at least partially on the original pulse ratio (PR), the first function (G) and the second function (G).