US 11,722,082 B2
Method and device for controlling a synchronous machine without a position sensor by means of unique assignment of the flux linkage to the rotor position
Peter Landsmann, Munich (DE); Sascha Kuehl, Munich (DE); and Dirk Paulus, Munich (DE)
Assigned to KOSTAL Drives Technology GmbH, Luedenscheid (DE)
Filed by KOSTAL Drives Technology GmbH, Luedenscheid (DE)
Filed on May 18, 2022, as Appl. No. 17/747,054.
Application 17/747,054 is a continuation of application No. PCT/EP2020/083056, filed on Nov. 23, 2020.
Claims priority of application No. 19000531 (EP), filed on Nov. 25, 2019.
Prior Publication US 2022/0286071 A1, Sep. 8, 2022
Int. Cl. H02P 21/18 (2016.01); H02P 25/089 (2016.01)
CPC H02P 21/18 (2016.02) [H02P 25/089 (2016.02); H02P 2203/05 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for use with a synchronous machine having a stator and a rotor with or without permanent magnets, the method comprising:
measuring electric current of the synchronous machine responsive to the synchronous machine being actuated via clocked terminal voltages;
determining a magnetic flux linkage based on the clocked terminal voltages and the measured electric current;
storing multiple profiles of the magnetic flux linkage as a function of rotation of the rotor in a model for different electric current values, from which a profile is selected according to the measured electric current;
using the selected profile of the magnetic flux linkage as a function of rotation of the rotor, under a boundary condition of an at least two-dimensional electric current vector that is unchanged in coordinates of the stator, to detect a position of the rotor, wherein only the magnetic flux linkage and the electric current vector, and the stored profiles of the magnetic flux linkage, are used for detecting the position of the rotor, and the position of the rotor is neither directly nor indirectly fed back to detect a subsequent position of the rotor; and
controlling the synchronous machine according to the rotor position.