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초록
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.
키워드
BEMF; cogging torque; magnetization; UMF; Back electromotive force; BEMF; Cogging torque; Frequency components; Hard disk drives; Mathematical equations; Spindle motors; Surface flux; UMF; Unbalanced magnetic force; Electromotive force; Hard disk storage; Harmonic analysis; Magnetic recording; Magnetization; Torque
- 제목
- Characteristics of BEMF, cogging torque and UMF in a HDD spindle motor due to magnetization of PM
- 저자
- Kang, Kyungjin; Jang, Gun hee; Sung, Sangjin
- 발행일
- 2013-01
- 유형
- Conference Paper
- 저널명
- 2012 Digest APMRC - Asia-Pacific Magnetic Recording Conference: A Strong Tradition. An Exciting New Look!
- 페이지
- 1 ~ 2