Improvement in Torque Density by Ferrofluid Injection into Magnet Tolerance of Interior Permanent Magnet Synchronous Motor

In-Jun Yang, Si-Woo Song, Dong-Ho Kim, Kwang-Soo Kim and Won-Ho Kim
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In-Jun Yang: Department of Electrical Engineering, Hanyang University, Seoul 04763, Korea
Si-Woo Song: Department of Electrical Engineering, Hanyang University, Seoul 04763, Korea
Dong-Ho Kim: Department of Electrical Engineering, Hanyang University, Seoul 04763, Korea
Kwang-Soo Kim: Department of Mechatronics Engineering, Halla University, Wonju 26404, Korea
Won-Ho Kim: Department of Electrical Engineering, Gachon University, Seongnam 13120, Korea

Energies, 2021, vol. 14, issue 6, 1-18

Abstract: In an interior permanent magnet synchronous motor, an adhesive such as bond is generally injected into the magnet tolerance to prevent vibration of the permanent magnet within the insertion space. In this case, a disadvantage is that the magnet tolerance does not contribute to the performance. In this paper, ferrofluid is inserted to improve the torque density, utilizing the magnet tolerance. When inserting ferrofluid into the magnet tolerance, it is important to fix the magnet because conventional adhesives are not used, and it is important that the ferrofluid does not act as a leakage path within the insertion space. In this study, a new rotor configuration using a plastic barrier that satisfies these considerations was introduced. The analysis was conducted through finite element analysis (FEA), and this technique was verified by comparing the simulation results and the experimental results through a dynamo test. It was confirmed that the no-load back electromotive force in the final model increased through ferrofluid injection.

Keywords: permanent magnet (PM) motor; interior permanent magnet synchronous motor (IPMSM); ferrofluid; torque density; magnet tolerance (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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