Characteristics of BEMF, Cogging Torque and UMF in a HDD Spindle Motor due to Magnetization of PM

被引：0
|
作者：
Kang, K. J. [1 ]
Jang, G. H. [1 ]
Sung, S. J. [1 ]
机构：
[1] Hanyang Univ, PREM, Seoul 133791, South Korea
来源：
2012 DIGEST ASIA-PACIFIC MAGNETIC RECORDING CONFERENCE (APMRC) | 2012年
关键词：
BEMF; cogging torque; UMF; magnetization; BRUSHLESS DC MOTORS;
D O I：
暂无
中图分类号：
TP301 [理论、方法];
学科分类号：
081202 ;
摘要：
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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页数：2
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