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Characteristics of BEMF, cogging torque and UMF in a HDD spindle motor due to magnetization of PM
- Authors
- Kang, Kyungjin; Jang, Gun hee; Sung, Sangjin
- Issue Date
- Jan-2013
- Publisher
- IEEE
- Keywords
- BEMF; cogging torque; magnetization; UMF
- Citation
- 2012 Digest APMRC - Asia-Pacific Magnetic Recording Conference: A Strong Tradition. An Exciting New Look!, pp.1 - 2
- Indexed
- SCOPUS
- Journal Title
- 2012 Digest APMRC - Asia-Pacific Magnetic Recording Conference: A Strong Tradition. An Exciting New Look!
- Start Page
- 1
- End Page
- 2
- Abstract
- This research mathematically derives the frequency components of back electromotive force (BEMF), cogging torque and unbalanced magnetic force (UMF) of a hard disk drives (HDD) spindle motor with 12 poles and 9 slots (12P9S) due to unevenly magnetized permanent magnet (PM). Only 3-multiple harmonics originated from uneven magnetization of PM introduces 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. The proposed mathematical equations are experimentally validated by comparing measured BEMF, cogging torque and UMF with measured surface flux density of PM.
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Related Researcher
- Jang, Gun Hee
- COLLEGE OF ENGINEERING (SCHOOL OF MECHANICAL ENGINEERING)