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.
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