US 12,445,069 B2
Method for operating an electric motor, controller, piston pump
Andreas Schmidtlein, Tamm (DE); and Christoph Emde, Leingarten (DE)
Assigned to ROBERT BOSCH GMBH, Stuttgart (DE)
Appl. No. 18/245,989
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Aug. 11, 2021, PCT No. PCT/EP2021/072405
§ 371(c)(1), (2) Date Mar. 20, 2023,
PCT Pub. No. WO2022/063481, PCT Pub. Date Mar. 31, 2022.
Claims priority of application No. 10 2020 211 994.5 (DE), filed on Sep. 24, 2020.
Prior Publication US 2023/0353070 A1, Nov. 2, 2023
Int. Cl. H02P 6/06 (2006.01); F04B 17/03 (2006.01); H02P 6/30 (2016.01); B60T 13/74 (2006.01); B60T 17/02 (2006.01)
CPC H02P 6/06 (2013.01) [F04B 17/03 (2013.01); H02P 6/30 (2016.02); B60T 13/745 (2013.01); B60T 17/02 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method for operating an electric motor of a piston pump, wherein the electric motor includes a rotor shaft, the method comprising the following steps:
actuating the electric motor with a target rotational speed and a target rotational direction for the rotor shaft as a function of a power demand;
monitoring an actual rotational speed of the rotor shaft; and
changing the target rotational direction, wherein the target rotational direction is changed for a specified period of time when the actual rotational speed is equal to zero and the target rotational speed is unequal to zero, and then actuating the electric motor again at the target rotational speed and in the target rotational direction, wherein, to actuate the electric motor, a motor winding is energized as a function of an angular position of the rotor shaft, and an actual angular position of the rotor shaft is detected and provided with an offset for the specified period of time to determine the angular position therefrom, wherein the offset is selected such that the target rotational direction of the rotor shaft is changed.