Design of Hydrodynamic Bearing for Miniature Hard Disk Drives

Asada, Takafumi; Saitou, Hiroaki; Itou, Daisuke

doi:10.1109/tmag.2007.902978

Cited by 15 publications

(3 citation statements)

References 6 publications

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“…Currently, groove geometries that are being widely used in HDD thrust bearings are mainly a spiral or a herringbone grooved geometries. Several investigators have conducted numerical analysis predictions of these grooves for HDD bearing performance [1][2][3][4][5]. There were also some attempts at improving the dynamic stiffness and damping of HDD spindle by introducing permanent magnetic thrust plates into the bearing spindle structure [6] or introducing magnetic fluid as lubricants [7].…”

Section: Introductionmentioning

confidence: 99%

Optimum Design of Oil Lubricated Thrust Bearing for Hard Disk Drive with High Speed Spindle Motor

Sunami

Ibrahim

Hashimoto

2013

International Journal of Rotating Machinery

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This paper presents the application of optimization method developed by Hashimoto to design oil lubricated thrust bearings for 2.5 inch form factor hard disk drives (HDD). The designing involves optimization of groove geometry and dimensions. Calculations are carried out to maximize the dynamic stiffness of the thrust bearing spindle motor. Static and dynamic characteristics of the modeled thrust bearing are calculated using the divergence formulation method. Results show that, by using the proposed optimization method, dynamic stiffness values can be well improved with the bearing geometries not being fixed to conventional grooves.

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Section: Introductionmentioning

confidence: 99%

Optimum Design of Oil Lubricated Thrust Bearing for Hard Disk Drive with High Speed Spindle Motor

Sunami

Ibrahim

Hashimoto

2013

International Journal of Rotating Machinery

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“…The hydrodynamic bearings are more compact than hydrostatic bearings, but in start/stop state or low-speed conditions, the frictional force is large and eccentric problem is inevitable. 7,8 In terms of magnetic levitation bearings, an active position feedback system is necessary which makes the control system more complicated. 9,10 As a kind of potential smart materials, piezoelectric ceramics have been widely used in the fields of ultrasonic motors, 11,12 ultrasonic machining, 13,14 and ultrasonic transportation.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Suspending force modeling based on nonlinear acoustics and high-speed running experiments for an ultrasonic journal bearing

Wang

Bai

et al. 2014

Advances in Mechanical Engineering

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As a kind of promising noncontact bearings, ultrasonic bearings actuated by smart materials such as lead zirconate titanate ceramics show a good application prospect in high-speed machines and precision-measuring devices. The suspending force is one of the most important parameters that play a dominated role on the bearing’s static and dynamic performance. A suspending force model based on acoustic radiation theory for cylindrical object near sound source is built to predict the radial carrying capacity of an ultrasonic bearing actuated by three piezoelectric transducers. To validate the model, an ultrasonic bearing prototype is developed and a testing system is established. For observing the bearing’s dynamic running performance at high speeds, the bearing’s running experiment is carried out and the rotor center’s trajectory data and frequency spectrum are acquired to analyze the bearing’s dynamic characteristics at high speeds. The suspending force model and running performance experiments will contribute to the design, detection, and test of this type of bearings.

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Experimental and parametric studies of 0.85-in. hard disk drives spindle motor vibration

Shen

Okamoto

et al. 2009

Microsyst Technol

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This paper is to document major research results from the authors' recent experimental and numerical studies of spindle motor vibration of 0.85-in. hard disk drives (HDD). Experimental studies indicate that spindle vibration of 0.85-in. HDD is very sensitive to its supporting fixture design. A poorly designed fixture can lead to spurious modes that do not reflect true vibration characteristics of the HDD. Experimental measurements also indicate that vibration of 0.85-in. HDD primarily consists of base plate vibration as opposed to rocking motion of the spinning disk pack, also known as (0,1) unbalanced modes, which dominates vibration of 3.5-in. HDD. For the numerical studies, simulation results from a component modes synthesis agree very well with the experimental measurements. Moreover, the dominance of the base plate vibration observed in the experimental studies results from the fact that the lowest natural frequency of the base plate is significantly smaller than that of the spinning disk in 0.85-in. HDD. Finally, a parametric study is conducted to identify critical parameters that significantly affect the spindle vibration of 0.85-in. HDD. Results of the parametric study indicate that rigidity of the base plate and locations of the radial bearing are the most critical parameters.

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Design of Hydrodynamic Bearing for Miniature Hard Disk Drives

Cited by 15 publications

References 6 publications

Optimum Design of Oil Lubricated Thrust Bearing for Hard Disk Drive with High Speed Spindle Motor

Optimum Design of Oil Lubricated Thrust Bearing for Hard Disk Drive with High Speed Spindle Motor

Suspending force modeling based on nonlinear acoustics and high-speed running experiments for an ultrasonic journal bearing

Experimental and parametric studies of 0.85-in. hard disk drives spindle motor vibration

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