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http://dx.doi.org/10.5370/JEET.2018.13.4.1558

Variable-magnitude Voltage Signal Injection for Current Reconstruction in an IPMSM Sensorless Drive with a Single Sensor  

Im, Jun-Hyuk (Dept. of Electrical Engineering, Hanyang University)
Kim, Sang-Il (Dept. of Electrical Engineering, Hanyang University)
Kim, Rae-Young (Dept. of Electrical and Biomedical Engineering, Hanyang University)
Publication Information
Journal of Electrical Engineering and Technology / v.13, no.4, 2018 , pp. 1558-1565 More about this Journal
Abstract
Three-phase current is reconstructed from the dc-link current in an AC machine drive with a single current sensor. Switching pattern modification methods, in which the magnitude of the effective voltage vector is secured over its minimum, are investigated to accurately reconstruct the three-phase current. However, the existing methods that modify the switching pattern cause voltage and current distortions that degrade sensorless performance. This paper proposes a variable-magnitude voltage signal injection method based on a high frequency voltage signal injection. The proposed method generates a voltage reference vector that ensures the minimum magnitude of the effective voltage vector by varying the magnitude of the injection signal. This method can realize high quality current reconstruction without switching pattern modification. The proposed method is verified by experiments in a 600W Interior permanent magnet synchronous machine (IPMSM) drive system.
Keywords
Current reconstruction; High frequency voltage signal injection; IPMSM; Single current sensor;
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