NDLI: Effect of rotor eccentricity on spindle vibration in magnetically symmetric and asymmetric BLDC motors

Content Provider	IEEE Xplore Digital Library
Author	Kyung-Tae Kim Kang-Moon Hwang Gun-Yong Hwang Tae-Jong Kim Weui-Bong Jeong Chul-U Kim
Copyright Year	2001
Description	Author affiliation: Sch. of Mech. Eng., Pusan Nat. Univ., South Korea (Kyung-Tae Kim)
Abstract	The permanent magnet motor is often the most important element in hard disk drive (HDD) spindles and also a frequent source of vibration and acoustic noise. Ecentricity between stator and rotor is inevitably introduced during the manufacturing process, such as mass unbalance, shaft bow and bearing tolerances. This paper analytically discusses the effects of rotor eccentricity on motor performance for symmetric and asymmetric motors, such as local traction, unbalanced force, cogging torque, back EMF, phase current and torque ripple. Based on the results of the unbalanced radial forces, the radial runout of the spindle motor is analyzed using finite element transfer matrices. An asymmetric motor, mostly chosen to reduce the cogging torque, shows a worse effect on cogging torque, unbalanced force and radial runout when the eccentricity exists. It also adversely affects the flux linkage and introduces variation of the phase back EMF depending on winding and rotating eccentricity, thus yielding increased mutual torque ripple.
Sponsorship	IEEE Ind. Electron. Soc.
Starting Page	967
Ending Page	972
File Size	437362
Page Count	6
File Format	PDF
ISBN	0780370902
DOI	10.1109/ISIE.2001.931604
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-06-12
Publisher Place	South Korea
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Torque Traction motors Rotors Forging Magnetic levitation Magnetic flux Permanent magnet motors Hard disks Acoustic noise Stators
Content Type	Text
Resource Type	Article

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