US 12,463,570 B2
Stable and passive observer-based V/Hz control for induction motors
Marko Hinkkanen, Espoo (FI); and Lauri Tiitinen, Espoo (FI)
Assigned to ABB Schweiz AG, Baden (CH)
Filed by ABB Schweiz AG, Baden (CH)
Filed on Sep. 27, 2023, as Appl. No. 18/475,971.
Claims priority of application No. 22199833 (EP), filed on Oct. 5, 2022.
Prior Publication US 2024/0128905 A1, Apr. 18, 2024
Int. Cl. H02P 21/13 (2006.01); H02P 21/14 (2016.01)
CPC H02P 21/13 (2013.01) [H02P 21/141 (2013.01)] 17 Claims
OG exemplary drawing
 
15. An electric drive configured to drive an induction motor, the electric drive comprising an inverter and a computing device having a processor, and a memory storing instructions that, when executed by the processor, cause the computing device to:
obtain a stator current vector of the induction motor;
estimate, using a state observer for a stator and/or rotor flux linkage vector of the induction motor, the stator and/or rotor flux linkage vector based on the stator current vector, a voltage reference vector and a stator angular frequency reference, wherein the state observer is a speed-sensorless reduced-order state observer based on a mathematical model of the induction motor;
perform speed-sensorless state-feedback control based on the estimated stator and/or rotor flux linkage vector, the stator current vector, a stator flux linkage reference vector and the stator angular frequency reference so as to calculate a stator voltage reference vector; and
apply the stator voltage reference vector to the inverter for feeding the induction motor.