Source and Reduction of Uneven Magnetization of the Permanent Magnet of a HDD Spindle Motor

被引：19
|
作者：
Lee, C. J. [1 ]
Lee, C. I. [1 ]
Jang, G. H. [1 ]
机构：
[1] Hanyang Univ, Dept Mech Engn, PREM, Seoul 133791, South Korea
来源：
IEEE TRANSACTIONS ON MAGNETICS | 2011年 / 47卷 / 07期
关键词：
HDD spindle motor; magnetizer; permanent magnet; surface flux density; uneven magnetization; BRUSHLESS DC MOTORS;
D O I：
10.1109/TMAG.2011.2123877
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
Uneven magnetization of a permanent magnet (PM) generates cogging torque with slot harmonics and an unbalanced magnetic force, which are the major sources of vibration and noise in a hard disk drive (HDD) spindle motor. We investigated several potential sources of uneven magnetization of a ring-shaped PM magnetized in a capacitor-discharge impulse magnetizer by transient finite element analysis. We verified our simulation model by comparing the simulated surface magnetic flux density along the ring-shaped PM with the measured flux density. Our research findings demonstrate that positioning error of the coil of the magnetizing yoke is the dominant source of uneven magnetization. High magnetic field intensity in the magnetization moment due to high magnetizing voltage or the presence of a back yoke decreases the uneven magnetization of the PM by compensating for the coil-positioning error.
引用
收藏
页码：1929 / 1932
页数：4
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