Cogging torque of a brushless DC (BLDC) motor is a source of the vibration and noise of the hard disk drive (HDD) spindle motor, and the excitation frequencies of the cogging torques are the harmonics of the least common multiple of the poles and slots in ideal BLDC motors. However, manufacturing errors generate the additional harmonics to the cogging torque. Especially, the uneven magnetization of the permanent magnet (PM) in BLDC motors generates additional slot harmonics to the cogging torque. In small BLDC motors such as 2.5″ HDD spindle motors, the effect of additional slot harmonics is as serious as that of the fundamental harmonics of the cogging torque. A coil-positioning error of the magnetizer is a major source among the several potential sources of uneven magnetization of a ring-shaped PM in a HDD spindle motor [1]. It is difficult to estimate and to reduce the coil-positioning error when manufacturing a magnetizer. In addition, each magnetizer has different range of the coil-positioning error.
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ASME 2013 Conference on Information Storage and Processing Systems
June 24–25, 2013
Santa Clara, California, USA
Conference Sponsors:
- Information Storage and Processing Systems Division
ISBN:
978-0-7918-5553-9
PROCEEDINGS PAPER
Robust Optimal Design of the Magnetizer for a HDD Spindle Motor to Reduce the Harmonic Components of the Cogging Torque
D. H. Choi
D. H. Choi
Hanyang University, Seoul, Korea
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C. J. Lee
Hanyang University, Seoul, Korea
G. H. Jang
Hanyang University, Seoul, Korea
K. B. Kang
Hanyang University, Seoul, Korea
D. H. Choi
Hanyang University, Seoul, Korea
Paper No:
ISPS2013-2850, V001T05A001; 3 pages
Published Online:
December 4, 2013
Citation
Lee, CJ, Jang, GH, Kang, KB, & Choi, DH. "Robust Optimal Design of the Magnetizer for a HDD Spindle Motor to Reduce the Harmonic Components of the Cogging Torque." Proceedings of the ASME 2013 Conference on Information Storage and Processing Systems. ASME 2013 Conference on Information Storage and Processing Systems. Santa Clara, California, USA. June 24–25, 2013. V001T05A001. ASME. https://doi.org/10.1115/ISPS2013-2850
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