Self-commissioning of a bearingless-motor drive

Seppo Saarakkala (Inventor), Victor Mukherjee (Inventor), Maksim Sokolov (Inventor), Marko Hinkkanen (Inventor), Anouar Belahcen (Inventor)

Research output: Patent


A method and apparatus for self-commissioning a bearingless-motor drive, which includes a bearingless motor and a control unit of the bearingless motor are disclosed. The motor includes at least one winding and at least one permanent magnet. The method includes generating a magnetic model, the magnetic model including a plurality of constant parameters; supplying, while the movable part remains standstill, to the at least one winding at least two unequal currents; measuring, with a magnetic sensor, flux linkages caused by said at least two unequal currents, respectively; calculating, with the magnetic model, flux linkages by inputting to the magnetic model current values equal to the currents supplied to the at least one winding; and fitting, with a least-squares fitting algorithm, at least one constant parameter in the magnetic model such that the difference between the measured and calculated flux linkages will be minimized.
Original languageEnglish
Patent numberUS 11 043 864 (B2)
IPCH02P 21/14,H02K 1/28
Priority date03/09/2018
Filing date14/08/2019
Publication statusPublished - 22 Jun 2021
MoE publication typeH1 Granted patent


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