Sensorless PMSM Drive Implementation by Introduction of Maximum Efficiency Characteristics in Reference Current Generation

Željko Plantić, Tine Marčič, Miloš Beković and Gorazd Štumberger
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Željko Plantić: Energy Institute Hrvoje Požar, 10001 Zagreb, Croatia
Tine Marčič: Energy Agency of the Republic of Slovenia, 2000 Maribor, Slovenia
Miloš Beković: Power engineering institute, Faculty of Electrical Engineering and Computer Science; University of Maribor, 2000 Maribor, Slovenia
Gorazd Štumberger: Power engineering institute, Faculty of Electrical Engineering and Computer Science; University of Maribor, 2000 Maribor, Slovenia

Energies, 2019, vol. 12, issue 18, 1-14

Abstract: This paper presents the efficiency improvement in a speed closed-loop controlled permanent magnet synchronous machine (PMSM) sensorless drive. The drive efficiency can be improved by minimizing the inverter and the PMSM losses. These can be influenced by proper selection of DC-bus voltage and switching frequency of the inverter. The direct (d-) and quadrature (q-) axis current references generation methods, discussed in this paper, further improve the efficiency of the drive. Besides zero d-axis current reference control, the maximum torque per ampere (MTPA) characteristic is normally applied to generate the d- and q-axis current references in vector controlled PMSM drives. It assures control with maximum torque per unit of current but cannot assure maximum efficiency. In order to improve efficiency of the PMSM drive, this paper proposes the generation of d- and q-axis current references based on maximum efficiency (ME) characteristic. In the case study, the MTPA and ME characteristics are theoretically evaluated and determined experimentally by measurements on discussed PMSM drive. The obtained characteristics are applied for the d- and q-axis current references generation in the speed closed-loop vector controlled PMSM drive. The measured drive efficiency clearly shows that the use of ME characteristic instead of MTPA characteristic or zero d-axis current in the current references generation improves the efficiency of PMSM drive realizations with position sensor and without it—sensorless control.

Keywords: magnetic loss; maximum efficiency (ME) characteristic; maximum torque per ampere (MTPA) characteristic; modeling; permanent magnet synchronous machine (PMSM); sensorless control (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: 2019
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