Full-Order Sliding Mode Observer Based on Synchronous Frequency Tracking Filter for High-Speed Interior PMSM Sensorless Drives

• Main Authors: Danyang Bao, Huiming Wu, Ruiqi Wang, Fei Zhao, Xuewei Pan
• Format: Article
• Language: English
• Published: MDPI AG 2020-12-01
• Series: Energies
• Subjects: IPMSM; full-order SMO; synchronous frequency tracking filter; position sensorless; Luenberger-based observer
• Online Access: https://www.mdpi.com/1996-1073/13/24/6511

In the research of the high-speed sensorless control strategy of an interior permanent-magnet synchronous motor (IPMSM), considering the harmonic influence of inverter nonlinearity on traditional sliding mode observer method, a full-order sliding mode observer (SMO) method based on synchronous frequency tracking filtering is proposed. This method avoids the phase delay defects caused by the use of filters in traditional second-order SMO. Then, the observed extended electromotive force (EMF) signal is filtered using a synchronous frequency tracking (SFT) function. It tracks the changing stator current and filters out harmonics that are not part of the tracking signal to achieve static tracking of the stator current. Then, the rotor speed can be estimated by a Luenberger-based observer. Experimental results verify the effectiveness and feasibility of the proposed method.