Performance Improvement of Operating Three-Degree-of-Freedom Spherical Permanent-Magnet Motor
- Authors
- Lee, Heun-Jae; Park, Hyeon-Jeong; Ryu, Gwang-Hyeon; Oh, Song Yee; Lee, Ju
- Issue Date
- Nov-2012
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Double-air-gap; humanoid joint system; positioning torque; spherical motor; three-degree-of-freedom (3-DOF)
- Citation
- IEEE TRANSACTIONS ON MAGNETICS, v.48, no.11, pp.4654 - 4657
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON MAGNETICS
- Volume
- 48
- Number
- 11
- Start Page
- 4654
- End Page
- 4657
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/164319
- DOI
- 10.1109/TMAG.2012.2200470
- ISSN
- 0018-9464
- Abstract
- This paper describes performance of operating three-degree-of-freedom (3-D.O.F.) spherical permanent-magnet motor with a finite-element-analysis and experimental studies. Torque and efficiency comparison was made for two different models; the pure iron processed stator core model with a Guide-frame structure, and powder formed stator core model with a Guide-frame structure. As a post study to compensate the defect of the guide frame structure, a double-air-gap operating three-degree-of-freedom spherical permanent-magnet motor has been proposed. Double air-gap type has a single stator, double air-gap between the outer rotor and the inner rotor. Moreover, the double air-gap type, which does not have a guide frame, has a higher torque density, better efficiency, and greater applicability. Finally, the estimated performance has been proven via experiment conducted under the proposed efficiency measurement method.
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