US 12,413,164 B2
Method for operating an electric machine, device, electric machine, and motor vehicle
Erick Falcon Alva, Bad Staffelstein (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Appl. No. 18/254,719
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Nov. 5, 2021, PCT No. PCT/EP2021/080723
§ 371(c)(1), (2) Date May 26, 2023,
PCT Pub. No. WO2022/117277, PCT Pub. Date Jun. 9, 2022.
Claims priority of application No. 10 2020 215 352.3 (DE), filed on Dec. 4, 2020.
Prior Publication US 2024/0007034 A1, Jan. 4, 2024
Int. Cl. H02P 21/16 (2016.01); B60L 15/20 (2006.01)
CPC H02P 21/16 (2016.02) [B60L 15/20 (2013.01); B60L 2240/421 (2013.01); B60L 2240/425 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for operating an electric machine having a rotatably mounted rotor (10) and at least one motor winding (13), the method comprising:
determining a temperature load of the machine (9), and
applying an electric motor current to the motor winding (13) to generate a specified desired torque (Mdesired) according to the temperature load, wherein when the temperature load exceeds a specified load threshold, a field strengthening mode of the machine (9) is activated, wherein the motor winding (13) in the field-strengthening mode is energized in such a way that the motor current has a positive field-forming current component (Id), and wherein when the temperature load falls below the load threshold, the motor winding (13) is energized in such a way that a torque-forming current component (Iq) of the motor current at least substantially matches the motor current.