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The electromagnetic (EM) sources of the acoustic noise are very concerned in the spindle motor used in the hard disk drives (HDDs). Identifying the effects of these sources is important for high performance hard disk drive products. The electromagnetic analysis results in this paper show that, when the spindle motor is driven by brushless DC (BLDC) mode, the EM torque ripples can be categorized as...
Both symmetric and asymmetric armature windings are applied in the spindle motors used in hard disk drives. Consider the influence of the drive current in the windings, the analysis to the unbalanced-magnetic-pull (UMP) generated in the motor becomes more difficult. Besides the intrinsic and extrinsic components, the additional UMP can also induced by the current, and the UMP could thus be serious...
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