Source and reduction of uneven magnetization of a permanent magnet of a HDD spindle motor

Lee, C.J.; Lee, C.I.; Jang, G.H.

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Source and reduction of uneven magnetization of a permanent magnet of a HDD spindle motor

Lee, C.J.;
Lee, C.I.;
Jang, G.H.

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SCOPUS

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초록

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.

키워드

HDD spindle motor; Magnetizer; Permanent magnet; Surface flux density; Uneven magnetization; Cogging torque; High magnetic fields; Impulse magnetizers; Magnetic flux densities; Magnetizer; Magnetizing voltage; Positioning error; Simulation model; Slot harmonics; Spindle motors; Surface flux density; Transient finite element analysis; Unbalanced magnetic force; Uneven magnetization; Computer simulation; Finite element method; Magnetic fields; Magnetic flux; Magnetic recording; Magnetization; Permanent magnets; Surface measurement; Magnetic devices

제목: Source and reduction of uneven magnetization of a permanent magnet of a HDD spindle motor

저자: Lee, C.J.; Lee, C.I.; Jang, G.H.

발행일: 2010-12

유형: Conference Paper

저널명: Digest of the Asia-Pacific Magnetic Recording Conference 2010, APMRC 2010

페이지: 1 ~ 2