A new Bernard–Praly-like observer for sensorless IPMSMs. (June 2022)

• Record Type: Journal Article
• Authors: Verrelli, Cristiano Maria; Carfagna, Emilio; Frigieri, Matteo; Crinto, Andrea Stefano; Lorenzani, Emilio
• Is Part Of: Automatica. Volume 140(2022)
• Publication Date: 2022-06
• Subjects: Interior Permanent Magnet Synchronous Motors -- Adaptive observer -- Persistency of excitation -- Sensorless control; Automatic control -- Periodicals; Automation -- Periodicals; 629.805
• DOI: 10.1016/j.automatica.2022.110266
• Languages: English
• ISSNs: 0005-1098

Abstract

Abstract: A slight extension of the global Bernard–Praly gradient adaptive observer – originally presented for nonsalient-pole surface Permanent Magnet Synchronous Motors (PMSMs) and recently proved to own local exponential convergence properties under well-known observability conditions – is here designed and proposed for Interior Permanent Magnet Synchronous Motors (IPMSMs) (with relatively small saliency) in the case in which the q -axis current is constant. It guarantees local exponential estimation – from stator current and voltage measurements – of both the stator fluxes and the sinusoidal/co-sinusoidal functions of the motor electrical angle, with no modification of the previous persistency of excitation condition requirements. Such an extension complements – at least locally – a previous analysis concerning IPMSMs under constant d -axis current. Applications to the sensorless control of IPMSMs (with realistic simulations) are included.