US 12,294,321 B2
Methods and system for estimating electric machine position offset
Yingfeng Ji, Northville, MI (US); Yang Xu, Canton, MI (US); Michael W. Degner, Novi, MI (US); and Jiyao Wang, Canton, MI (US)
Assigned to Ford Global Technologies, LLC, Dearborn, MI (US)
Filed by Ford Global Technologies, LLC, Dearborn, MI (US)
Filed on Oct. 12, 2022, as Appl. No. 18/046,046.
Prior Publication US 2024/0128907 A1, Apr. 18, 2024
Int. Cl. H02P 21/00 (2016.01); H02P 21/18 (2016.01); H02P 21/22 (2016.01)
CPC H02P 21/18 (2016.02) [H02P 21/22 (2016.02)] 20 Claims
OG exemplary drawing
 
1. A method for operating an electric drive system, comprising:
via a controller, generating a pulsed torque current command and a zero flux current command, and operating the electric drive system via the pulsed torque current command and the zero flux current command, where the pulsed torque current command and the zero flux current command generate currents flowing through windings of the electric drive system; and
estimating an estimated offset angle between an electric machine rotor reference position and an electric machine position sensor reference position responsive to data generated while operating the electric drive system according to the pulsed torque current command and the zero flux current command.