A Simple Strategy for Sensorless Speed Control for an IPMSM During Startup and Over Wide Speed Range

  • Sim, Hyun-Woo ;
  • Lee, June-Seok ;
  • Lee, Kyo-Beum
  • Received : 2013.12.11
  • Accepted : 2014.04.13
  • Published : 2014.09.01


This paper presents a hybrid sensorless control for an interior permanent magnet synchronous motor (IPMSM) for zero-, low-, and high-speed regions. Many sensorless control methods such as an observer-based estimator have been introduced. However, most of the observer-based estimators have a disadvantage at start-up and in the low-speed region. To solve this problem, a simple strategy of using a hybrid system is proposed by integrating a high-frequency (HF) signal injection method and a full-order flux observer. In addition, an HF signal injection method with only a low pass filter (LPF) is proposed to simplify the hybrid system. The hybrid system achieves high-performance drive throughout the entire speed range. The effectiveness of the proposed hybrid technique is verified by experiments using an 11-kW IPMSM drive system.


Permanent magnet synchronous motor;Sensorless control;Signal injection;Full-order observer


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Supported by : Hyosung Power & Industrial Systems Performance Group