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:
Jul. 14, 2016
GM Global Technology Operations Llc, Detroit, MI (US);
Dwarakanath V. Simili, Oakland Township, MI (US);
Bon Ho Bae, Novi, MI (US);
Aayush Gupta, Rochester Hills, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
An electric machine assembly includes an electric machine having a stator configured to have a stator current and a controller configured to receive a torque command (T). The controller has a processor and tangible, non-transitory memory on which is recorded instructions for executing a method of modifying the stator current for enhanced flux weakening. The controller is programmed to obtain a base stator current [I, I] from a look-up table based at least partially on the torque command (T). The controller is programmed to obtain a characteristic angle (θ, i=1, 2, 3) based at least partially on a value of the torque command (T) and the base stator current [I, I]. A stator current modifier [ΔI, ΔI] is obtained based at least partially on the characteristic angle (θ, i=1, 2, 3) and a flux weakening factor (ΔI) such that: ΔI=(ΔI*cosine (θ)) and ΔI=(ΔI*sine (θ)).