Source and reduction of uneven magnetization of a permanent magnet of a HDD spindle motor
- Authors
- Lee, C.J.; Lee, C.I.; Jang, G.H.
- Issue Date
- Dec-2010
- Publisher
- IEEE
- Keywords
- HDD spindle motor; Magnetizer; Permanent magnet; Surface flux density; Uneven magnetization
- Citation
- Digest of the Asia-Pacific Magnetic Recording Conference 2010, APMRC 2010, pp.1 - 2
- Indexed
- SCOPUS
- Journal Title
- Digest of the Asia-Pacific Magnetic Recording Conference 2010, APMRC 2010
- Start Page
- 1
- End Page
- 2
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/173329
- ISSN
- 0000-0000
- Abstract
- Uneven magnetization of a permanent magnet (PM) generates the cogging torque with slot harmonics and the unbalanced magnetic force which are the major sources of vibration and noise in a HDD spindle motor. This research investigates the several sources of uneven magnetization of a ring-shaped PM by analyzing the transient finite element analysis in a capacitor-discharge impulse magnetizer. Developed simulation model is verified by comparing the simulated surface magnetic flux density along the ring-shaped PM with measured one. This research shows that the positioning error of magnetizing coil in the magnetizing yoke is dominant source of the uneven magnetization. High magnetic field intensity in the magnetization moment due to high magnetizing voltage or back yoke decreases the uneven magnetization of PM by compensating the coil positioning.
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