Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (12): 1673-1678.DOI: 10.12068/j.issn.1005-3026.2018.12.001

• Information & Control •     Next Articles

Novel Duty Ratio Modulation Strategy for PMSM DTC System

YUAN Tian-qing, WANG Da-zhi, LI Ye, WANG Xing-yu   

  1. School of Information Science & Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2017-03-08 Revised:2017-03-08 Online:2018-12-15 Published:2018-12-19
  • Contact: YUAN Tian-qing
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Abstract: In order to suppress the significant torque ripple and flux linkage ripple in CDTC(conventional direct torque control)-driven PMSM(permanent magnet synchronous motor), and to reduce the calculations in conventional duty ratio modulation strategies, a novel duty ratio modulation strategy for PMSM DTC(direct torque control) system was proposed. The impact factors of torque and flux linkage ripples could be distinguished using the proposed strategy through the active angle between stator linkage and sector vector. A new switching table was designed to ensure the optimal choice of voltage vector. The simplified duty ratio calculation equations were obtained with the minimum calculations. Simulation and experimental results show that the novel modulation strategy can maintain the dynamic response in CDTC and suppress torque and flux linkage ripples efficiently.

Key words: duty ratio modulation, PMSM(permanent magnet synchronous motor), DTC(direct torque control), torque ripple, flux linkage ripple

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