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High-frequency response current direct demodulation method for sensorless control of interior permanent magnet synchronous motor drives

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Abstract

Sensorless schemes are mainly used in fault-tolerant control of interior permanent magnet synchronous motor (IPMSM) drives. Traditional sensorless methods with injection of high-frequency (HF) carrier signals into the stationary reference frame have a stable performance. However, phase shifts caused by conventional high-pass filters (HPFs) decrease the estimation accuracy. Besides, the demodulation process is usually complicated, which increases the difficulty of application. To solve these problems, this study presents an HF-induced current direct demodulation method. Rotor position angle can be solved from the sampled currents at adjacent moments without demodulation signals. Therefore, the errors related to filters in the rotor position estimation are eliminated. Besides, the efficiency of the demodulation algorithm is improved. Furthermore, an online compensation method for cross-saturation effect is proposed. Experimental results verify that the proposed strategy can obtain an accurate rotor position with good steady-state and dynamic performance.

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Authors and Affiliations

  1. School of Automation, Northwestern Polytechnical University, Xi’an, China

    Wenzhen Li & Jinglin Liu

  2. Department of Electronic Engineering, University of York, York, YO10 5DD, UK

    Chao Gong

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  1. Wenzhen Li
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  2. Jinglin Liu
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Correspondence to Jinglin Liu.

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Li, W., Liu, J. & Gong, C. High-frequency response current direct demodulation method for sensorless control of interior permanent magnet synchronous motor drives. J. Power Electron. 22, 784–795 (2022). https://doi.org/10.1007/s43236-022-00401-5

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  • DOI: https://doi.org/10.1007/s43236-022-00401-5

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