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access icon free Torque-ripple reduction of SRM using optimised voltage vector in DTC

© The Institution of Engineering and Technology
Received 18/10/2017, Accepted 02/01/2018, Revised 05/12/2017, Published 03/01/2018

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.

Inspec keywords: reluctance motor drives; magnetisation; machine vector control; voltage control; torque control

Other keywords: optimised voltage vector; direct torque control; control rules; voltage vector selection; magnetisation characteristics; 12/8-pole three-phase SRM drive system; nonuniform torque; torque ripple reduction strategies; DTC algorithms; switched reluctance motors; motor doubly salient structure; sector zones

Subjects: Mechanical variables control; Synchronous machines; Drives; Control of electric power systems; Voltage control

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