New exponential convergence properties for Bernard–Praly observer and adaptive sensorless control of PMSMs. (November 2020)

• Record Type: Journal Article
• Authors: Verrelli, Cristiano Maria; Tomei, Patrizio
• Is Part Of: Automatica. Volume 121(2020)
• Publication Date: 2020-11
• Subjects: Permanent magnet synchronous motors -- Sensorless control -- Adaptive observer -- Persistency of excitation; Automatic control -- Periodicals; Automation -- Periodicals; 629.805
• DOI: 10.1016/j.automatica.2020.109197
• Languages: English
• ISSNs: 0005-1098

Abstract

Abstract: It is innovatively established, through a nonlinear Persistency of Excitation (PE) analysis, that the latest Bernard–Praly gradient adaptive observer – for nonsalient-pole surface Permanent Magnet Synchronous Motors (PMSMs) with uncertain flux of the permanent magnet (PM) – owns exponential convergence properties under well-known observability conditions. Such exponential properties can be crucially used to provide a new solution to the long-standing problem of guaranteeing position/speed tracking in sensorless PMSMs, in the presence of uncertain constant parameters such as load torque, PM flux and possibly stator resistance.