Direct Torque Control for Permanent-Magnet Synchronous Machines Based on Duty Ratio Modulation

• Published in: IEEE transactions on industrial electronics (1982) Vol. 62; no. 10; pp. 6160 - 6170
• Main Authors: Niu, Feng, Li, Kui, Wang, Yao
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.10.2015; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Balancing; Direct torque control (DTC); duty ratio modulation (DRM); Flux; Inverters; Mathematical model; Modulation; permanent magnet synchronous machine (PMSM); Permanent magnets; Reduction; Ripples; stator flux ripple; Stator windings; Stators; Torque; Torque control; torque ripple; Voltage control; Weight reduction; Direct torque control (DTC); permanent-magnet synchronous machine (PMSM); stator flux ripple; duty ratio modulation (DRM); torque ripple
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2015.2426678

This paper proposes a novel duty ratio modulated direct torque control (DDTC) to concurrently reduce torque ripple and stator flux ripple that are typically associated with conventional direct torque control (DTC). Three different methods of duty ratio determination are presented to achieve various control objectives, namely DDTC-final, DDTC-mean and DDTC-rms. Additionally, adjustable error weight coefficients are introduced to balance the torque ripple reduction and stator flux ripple reduction. Experimental results are presented to validate the effectiveness of proposed DDTC. Furthermore, the comparative evaluation of proposed DDTC, conventional DDTC and DTC is conducted on the basis of several criteria to verify the superiority of proposed DDTC.