Self-Sensing Control of Open-End Winding PMSMs Fed by an Asymmetrical Hybrid Multilevel Inverter

Salvatore Foti, Antonio Testa, Giacomo Scelba, Salvatore De Caro and Giuseppe Scarcella
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Salvatore Foti: Department of Engineering (D.I), University of Messina, 98166 Messina, Italy
Antonio Testa: Department of Engineering (D.I), University of Messina, 98166 Messina, Italy
Giacomo Scelba: Department of Electrical, Electronic and Computer Engineering (D.I.E.E.I.), University of Catania, 95123 Catania, Italy
Salvatore De Caro: Department of Engineering (D.I), University of Messina, 98166 Messina, Italy
Giuseppe Scarcella: Department of Electrical, Electronic and Computer Engineering (D.I.E.E.I.), University of Catania, 95123 Catania, Italy

Energies, 2022, vol. 15, issue 9, 1-16

Abstract: The paper presents a self-sensing control technique for a special type of multilevel motor drive featuring an Open-end Winding Permanent-Magnet Synchronous Motor fed on one side by a main multilevel inverter (MLI) and on the other side by an auxiliary two-level inverter (TLI). In order to minimize the power losses, the MLI manages the machine active power operating at a low-switching frequency. The TLI instead acts as an active power filter and operates at a higher switching frequency and a lower DC-Bus voltage than the MLI. The current control task is shared between the two inverters, as a predictive action is exerted by the MLI, while a feedback action is accomplished by the TLI. Common sensorless rotor position estimation techniques cannot be straightforwardly applied on such a system, due to the particular drive structure. Therefore, a specific technique has been carried out, able to ensure satisfactory efficiency and control performance in all the operating speed ranges by optimally exploiting the different features of the two inverters. Simulation and experimental results confirm the effectiveness of the proposed approach.

Keywords: multilevel inverter; Open-end Winding; sensorless motor drive; low frequency modulation; high efficiency (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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