High torque ripple is inherent in switched reluctance motors (SRMs) because of the motor's doubly salient structure and highly non-uniform torque and magnetisation characteristics. Direct torque control (DTC) for SRM is one of the torque ripple reduction strategies which gets wide attention for its simpleness and effectiveness. In this study, aiming at the torque ripple phenomenon of DTC for SRM, a novel method for torque-ripple reduction is proposed. With the new methods, sector zones were redivided into 9 and 12 sector zones based on six sector zones and new control rules were adopted. Consequently, the proposed methods make the selection of voltage vector more precise. A 12/8-pole three-phase SRM drive system was designed to verify the effectiveness of the proposed new methods. The results verified that the improved DTC algorithms with 9 and 12 sector zones could indeed minimise the torque ripple to a great extent.
Torque-ripple reduction of SRM using optimised voltage vector in DTC
IET Electrical Systems in Transportation ; 8 , 1 ; 35-43
2018-01-15
9 pages
Article (Journal)
Electronic Resource
English
reluctance motor drives , sector zones , torque ripple reduction strategies , control rules , motor doubly salient structure , voltage control , direct torque control , nonuniform torque , switched reluctance motors , magnetisation characteristics , optimised voltage vector , voltage vector selection , machine vector control , torque control , 12/8-pole three-phase SRM drive system , magnetisation , DTC algorithms
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