US 12,103,432 B2
Method for operating an electric machine of a motor vehicle, system and motor vehicle
Andreas Jacob, Munich (DE); Jovan Knezevic, Munich (DE); and Raphael Weingartner, Garching (DE)
Assigned to Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
Appl. No. 17/778,222
Filed by Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
PCT Filed Nov. 11, 2020, PCT No. PCT/EP2020/081748
§ 371(c)(1), (2) Date May 19, 2022,
PCT Pub. No. WO2021/115712, PCT Pub. Date Jun. 17, 2021.
Claims priority of application No. 10 2019 133 634.1 (DE), filed on Dec. 10, 2019.
Prior Publication US 2022/0402403 A1, Dec. 22, 2022
Int. Cl. B60L 58/27 (2019.01); B60L 15/20 (2006.01); B60L 58/26 (2019.01); H01M 10/615 (2014.01); H01M 10/625 (2014.01); H01M 10/63 (2014.01); H01M 10/663 (2014.01); H01M 50/249 (2021.01); H02P 29/62 (2016.01)
CPC B60L 58/27 (2019.02) [B60L 15/20 (2013.01); B60L 58/26 (2019.02); H01M 10/615 (2015.04); H01M 10/625 (2015.04); H01M 10/63 (2015.04); H01M 10/663 (2015.04); H01M 50/249 (2021.01); H02P 29/62 (2016.02); B60L 2220/14 (2013.01); B60L 2240/421 (2013.01); B60L 2240/425 (2013.01); B60L 2240/545 (2013.01); H01M 2220/20 (2013.01); H02P 2207/05 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for operating an electric machine in a form of a synchronous machine of a motor vehicle, wherein the synchronous machine is operable in an efficient operating mode with optimum power losses and in an inefficient operating mode which increases power losses, the method comprising:
in order to provide an operating-point-specific torque, controlling the synchronous machine in the efficient operating mode such that a stator of the synchronous machine generates a synchronous rotating field which rotates synchronously with a rotor of the synchronous machine; and
in order to increase heat losses of the synchronous machine, wherein the heat losses are usable to heat at least one component of the motor vehicle, transferring the synchronous machine into the inefficient operating mode in which an asynchronous rotating field acts on the synchronous rotating field, wherein the asynchronous rotating field superposes heat-loss-increasing harmonics on a fundamental wave of the synchronous rotating field while maintaining the operating-point-specific torque.