US 12,341,449 B2
Method for determining a rotational angle position of a rotor of a multiphase electrical machine, and frequency converter
Torben Jonsky, Hannover (DE); and Heiko Stichweh, Springe (DE)
Assigned to Lenze SE, Aerzen (DE)
Appl. No. 17/798,703
Filed by Lenze SE, Aerzen (DE)
PCT Filed Feb. 11, 2021, PCT No. PCT/EP2021/053280
§ 371(c)(1), (2) Date Mar. 20, 2023,
PCT Pub. No. WO2021/160713, PCT Pub. Date Aug. 19, 2021.
Claims priority of application No. 10 2020 201 710.7 (DE), filed on Feb. 11, 2020.
Prior Publication US 2023/0253902 A1, Aug. 10, 2023
Int. Cl. H02P 21/24 (2016.01); H02P 6/185 (2016.01); H02P 21/18 (2016.01); H02P 21/22 (2016.01); H02P 27/08 (2006.01)
CPC H02P 21/22 (2016.02) [H02P 21/18 (2016.02); H02P 27/08 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for determining a rotational angle position of a rotor of a multi-phase electrical machine, the method comprising the steps of:
generating phase voltages for the multi-phase electrical machine by way of pulse-width modulation, in accordance with a drive voltage vector circulating in a stator-fixed coordinate system; and
executing, during a determination time interval, the steps of:
a) generating a test voltage vector;
vectorially adding the test voltage vector and an instantaneous drive voltage vector to form a sum vector, and
outputting the sum vector and measuring a resulting variation in a current vector formed from the phase currents;
b) repeating step a) a number n of times, with a changed rotational angle position and/or a changed value of the drive voltage vector, and with a changed test voltage vector, such that a total of n+1 different test voltage vectors and sum vectors are generated, and n+1 resulting changes of the current vector are measured; and
c) estimating the rotational angle position of the rotor in accordance with the total of n+1 measured variations in the current vector.