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Title of Journal: Microsyst Technol

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Abbravation: Microsystem Technologies

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Springer-Verlag

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DOI

10.1007/bf02003651

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1432-1858

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Analysis of PDT noise originating from driving met

Authors: Sangjin Sung Gunhee Jang Changjin Lee Kyungjin Kang
Publish Date: 2012/06/16
Volume: 18, Issue: 9-10, Pages: 1365-1371
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Abstract

This paper investigates the prominence discrete tone PDT noise originating from the driving method of a hard disk drive HDD spindle motor with 12 poles and 9 slots Torque ripple of a HDD is reconstructed by the multiplication of measured back electromotive force BEMF and measured switching current It shows that the frequency components of PDT noise match with those of torque ripple It also investigates the frequency change of PDT noise due to two driving methods which have the different switchingoff periods to detect the zerocrossing of the BEMF The BEMF has odd harmonics of the number of pole pair but the current has even harmonics of the number of pole pair due to the switchingoff period as well as those odd harmonics of BEMF We theoretically derive the torque equation in terms of the frequency components of BEMF and switching current We also verify that the even harmonics of the driving current due to driving method generate the 54th harmonic of torque ripple and show that the pure sinusoidal BEMF with the 6th harmonic can decrease the 36th harmonic of torque ripple as well as PDT noise in the HDD spindle systems

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