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  4. Vol 9, Issue 1, 2026

A Refined Approach to Position Estimation in Sensorless Control of IPMSM Drives with Small DC-Link Capacitor Drive System

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DOI: 10.23977/jeeem.2026.090102 | Downloads: 1 | Views: 46

Author(s)

Wenjing Fan 1

Affiliation(s)

1 Dept. of Electrical and Control Engineering, Xi'an University of Science and Technology, Xi'an 710600, Shaanxi Province, China

Corresponding Author

Wenjing Fan

ABSTRACT

To address harmonic-induced speed fluctuations in small DC-link capacitor drive systems, an improved Super-Twisting-Algorithm Adaptive Observer (STA-AO) is proposed for sensorless IPMSM control. It replaces the conventional PI mechanism in a model-reference-adaptive system (MRAS) observer with a super-twisting sliding-mode algorithm. This enhances robustness, accelerates error convergence, and improves dynamic response under system parameter variations. Simulations and experiments on a drive with small film capacitors demonstrate that the STA-AO significantly increases rotor position and speed estimation accuracy. It reduces feedback loop errors, improves modulation waveforms, and suppresses current harmonics, thereby enhancing overall control stability and performance.

KEYWORDS

Permanent magnet synchronous motor; small DC-link capacitor drive system; model-reference-adaptive; super-twisting sliding-mode sensorless

CITE THIS PAPER

Wenjing Fan. A Refined Approach to Position Estimation in Sensorless Control of IPMSM Drives with Small DC-Link Capacitor Drive System. Journal of Electrotechnology, Electrical Engineering and Management (2026). Vol. 9, No.1, 8-23. DOI: http://dx.doi.org/10.23977/jeeem.2026.090102.

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