Direct Drive Applications: Possible Replacement of Rare-Earth Permanent Magnet Motors

Chaelim Jeong, Luca Cinti and Nicola Bianchi
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Chaelim Jeong: Department of Electrical Engineering, Tongmyong University, Busan 48520, Korea
Luca Cinti: Department of Industrial Engineering, University of Padova, 35122 Padova, Italy
Nicola Bianchi: Department of Industrial Engineering, University of Padova, 35122 Padova, Italy

Energies, 2021, vol. 14, issue 23, 1-14

Abstract: This paper deals with the possibility to replace rare-earth permanent magnet (PM) motors in direct drive applications. According to previous researches, there are alternatives such as surface-mounted PM motors and spoke-type motors adopting Ferrite PMs, synchronous reluctance motors, with or without the assistance of low-energy PMs. Few studies have been carried out to compare all models at once, thus it is hard to choose which type motor is to be preferred as a valid alternative of rare-earth PM motors in direct drive applications. In this paper, the representative candidates listed above are analyzed and the results are compared with that of a rare-earth PM motor, which is considered as a reference motor. Additionally, the demagnetization phenomenon of the motors with Ferrite PMs is deeply analyzed because this kind of PM may be easily demagnetized by the stator flux. Finally, both strengths and weaknesses of each alternative motors are highlighted.

Keywords: alternative motor; demagnetization; direct drive; ferrite permanent magnet; neodymium permanent magnet; rare-earth; synchronous motors; torque motor (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: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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