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This research investigates numerically and experimentally the characteristics of axial unbalanced magnetic force (UMF) due to axial asymmetry of magnetic design in the spindle motor of a hard disk drive, and its effect on the acoustic noise and vibration. It shows that the least common multiple (LCM) harmonic of pole and slot of the acoustic noise and vibration are originated from axial UMF. It also...
The characteristics of the axial unbalanced magnetic force (UMF) in brushless dc (BLDC) motors were numerically and experimentally investigated. Three-dimensional finite element analysis was conducted to characterize the axial UMF. An experimental device was also developed to measure the axial UMF and verify the simulated results. The axial asymmetry of the permanent magnet (PM) with respect to the...
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