Development and Laboratory Testing of a Self-Excited Synchronous Machines without Permanent Magnets

Fabrizio Marignetti, Roberto Luigi Di Stefano, Guido Rubino and Paolo Conti
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Fabrizio Marignetti: Department of Engineering, University of Cassino and South Lazio, 03043 Cassino, Italy
Roberto Luigi Di Stefano: Department of Engineering, University of Cassino and South Lazio, 03043 Cassino, Italy
Guido Rubino: Department of Engineering, University of Cassino and South Lazio, 03043 Cassino, Italy
Paolo Conti: Department of Engineering, University of Cassino and South Lazio, 03043 Cassino, Italy

Energies, 2020, vol. 13, issue 15, 1-19

Abstract: Today, self-excited synchronous machines are the object of increasing interest because they use neither brushes nor permanent magnets. In fact, the price of rare earth metals is considerably high and still raising. This is the main reason why researchers are looking for suitable alternatives to permanent magnets in the construction of rotating electrical machinery. This paper deals with the design and laboratory testing of a synchronous machine with an efficient layout and an economic construction. The proposed self-excited machine exploits the space harmonics of the magneto-motive force to produce the excitation field. The model analysis is based on the computation of the back EMFs that are associated to the magneto motive force components. The mathematical model suggests an easy way to decouple the rotor windings. The machine has been built and experimental tests have been performed in order to validate the electrical behavior.

Keywords: self-excited synchronous machines; electromagnetic modeling; fractional slots; PM-less rotating machines; space MMF harmonics (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: 2020
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