US 12,308,768 B2
Method and apparatus for controlling flux of an electric drive unit for heat generation
Yuying Shi, Novi, MI (US); Vinod Chowdary Peddi, Shelby Township, MI (US); and Brian A. Welchko, Oakland Township, MI (US)
Assigned to GM Global Technology Operations LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Apr. 13, 2023, as Appl. No. 18/299,979.
Prior Publication US 2024/0348185 A1, Oct. 17, 2024
Int. Cl. H02P 21/22 (2016.01); B60H 1/00 (2006.01); B60H 1/22 (2006.01); H02P 6/00 (2016.01); H02P 27/06 (2006.01)
CPC H02P 21/22 (2016.02) [B60H 1/00392 (2013.01); B60H 1/2218 (2013.01); H02P 27/06 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method for operating an electric drive unit including a rechargeable energy storage system (RESS) that is electrically connected to an inverter that is operatively coupled to a polyphase alternating current (AC) motor, the method comprising:
receiving a torque command corresponding to a torque to be produced by the AC motor;
receiving a heat level request corresponding to a heat to be generated within the electric drive unit;
determining a voltage level for the RESS;
determining an initial current command for operating the AC motor that is responsive to the torque command based upon the voltage level for the RESS;
determining a flux level in a flux-intensifying region that is responsive to the heat level request;
determining a final current command based upon the initial current command and the flux level, wherein the final current command is responsive to the torque command and to the heat level request, and wherein the final current command includes operating in the flux-intensifying region; and
commanding operation of the inverter responsive to the final current command.