Frequency Characteristics of BEMF, Cogging Torque and UMF in a HDD Spindle Motor due to Unevenly Magnetized PM
- Title
- Frequency Characteristics of BEMF, Cogging Torque and UMF in a HDD Spindle Motor due to Unevenly Magnetized PM
- Author
- 장건희
- Keywords
- BEMF; cogging torque; magnetization
- Issue Date
- 2013-06
- Publisher
- IEEE; 1999
- Citation
- IEEE Transactions on Magnetics IEEE Trans. Magn. Magnetics, 2013, 49(6), 2578-2581
- Abstract
- This research mathematically derives the frequency equations of back electromotive force (BEMF), cogging torque and unbalanced magnetic force (UMF) of a brushless DC (BLDC) motor due to unevenly magnetized permanent magnet (PM). The proposed mathematical equations are experimentally validated by comparing with the measured BEMF, cogging torque and UMF of a hard disk drive (HDD) spindle motor with 12 poles and 9 slots (12P9S). Only 3-multiple harmonics originated from uneven magnetization of the PM in the spindle motor with 12P9S introduce same frequency components to BEMF and slot-multiple harmonics to cogging torque, respectively. However, other harmonics of the uneven magnetization of PM except the 3-multiple harmonics introduce slot-multiple +/- 1 harmonics to UMF.
- URI
- http://ieeexplore.ieee.org.access.hanyang.ac.kr/document/6522243/http://hdl.handle.net/20.500.11754/46478
- ISSN
- 0018-9464
- DOI
- 10.1109/TMAG.2013.2245317
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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