Flux Sliding-mode Observer Design for Sensorless Control of Dual Three-phase Interior Permanent Magnet Synchronous Motor

  • Shen, Jian-Qing ;
  • Yuan, Lei ;
  • Chen, Ming-Liang ;
  • Xie, Zhen
  • Received : 2013.03.20
  • Accepted : 2014.05.07
  • Published : 2014.09.01


A novel equivalent flux sliding-mode observer (SMO) is proposed for dual three-phase interior permanent magnet synchronous motor (DT-IPMSM) drive system in this paper. The DT-IPMSM has two sets of Y-connected stator three-phase windings spatially shifted by 30 electrical degrees. In this method, the sensorless drive system employs a flux SMO with soft phase-locked loop method for rotor speed and position estimation, not only are low-pass filter and phase compensation module eliminated, but also estimation accuracy is improved. Meanwhile, to get the regulator parameters of current control, the inner current loop is realized using a decoupling and diagonal internal model control algorithm. Experiment results of 2MW-level DT-IPMSM drives system show that the proposed method has good dynamic and static performances.


Dual three-phase IPMSM;Equivalent flux linkage;Sliding-mode observer;Sensorless control


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