Transient dynamic analysis of ferro-fluid bearing spindle motor |
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Authors: | J Yang S Chen Q Zhang Z Liu |
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Affiliation: | (1) Data Storage Institute, Singapore 117608 E-mail: dsijyang@dsi.nus.edu.sg, SG |
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Abstract: | With areal recording density of hard disk drives (HDD) historically growing at an average of 60% per year and fast spindle
speed to continue to reduce access time, it is becoming increasingly more difficult to maintain the precise positioning required
of the GMR heads to read and write data. Any unexpected vibration will cause the data written to a wrong data track. Consequently,
the dynamic behaviors of HDD spindle systems and their potential influences on track misregistration are key issues in disk
drive design. With rapid advances in the emerging consumer device market, the fluid bearing spindle motors, which have low
NRRO, low acoustic noise and high damping, are being developed as next generation spindles. This paper is to study transient
dynamic performance of HDD ferro-fluid bearing spindle systems. The FEA based component mode synthesis method is used to reduce
the overall spindle system dimensions. The effect of the unbalanced magnetic pulls (UMP) due to two different types of motor
configurations (balanced and unbalanced configurations) on the dynamic behaviors of spindle system was investigated. The simulated
results show that the motor with balanced configuration provides better spindle dynamic performance due to absence of UMP.
The UMP derived from the unbalanced configuration can result in some frequency resonance interactions and adversely affect
the HDD servo-tracking system.
Received: 5 July 2001/Accepted: 17 October 2001 |
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