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Frequency Characteristics of BEMF, Cogging Torque and UMF in a HDD Spindle Motor due to Unevenly Magnetized PM
- Authors
- Kang, Kyung-Jin; Jang, Gunhee; Sung, Sae Jin
- Issue Date
- Jun-2013
- Publisher
- Institute of Electrical and Electronics Engineers
- Keywords
- BEMF; cogging torque; magnetization; UMF
- Citation
- IEEE Transactions on Magnetics, v.49, no.6, pp 2578 - 2581
- Pages
- 4
- Indexed
- SCI
SCIE
SCOPUS
- Journal Title
- IEEE Transactions on Magnetics
- Volume
- 49
- Number
- 6
- Start Page
- 2578
- End Page
- 2581
- ISSN
- 0018-9464
1941-0069
- 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.
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