Publication Date

Spring 1997

Degree Type

Master's Project

Degree Name

Master of Science in Engineering (MSE)

Department

General Engineering

First Advisor

Dr. Fred Barez

Abstract

The trend of increasing storage capacity and decreasing form factor is still a key challenge in hard disk drive (HDD) development. The next generation models of high performance hard drives will require spindle motors of higher speed with low cogging torque and ripples to reduce vibration and be able to pack more data tracks. The main causes of vibration in the spindle motor, which results in acoustic noise in the drive are the defects of rolling ball bearing and magnet-pole/stator-slot configurations. This thesis project focuses on the slotless stator and non-contact bearing in the spindle motor. Some fundamental aspects of the brushless spindle motors are included for comprehensibility. The project emphasizes on the study and investigation of a spindle motor based on published literature to identify the limitations and common problems of today’s motors in disk drives. The possible solutions are then established to meet requirements for the next generation of HDD. For clarity, numerical and analytical calculations are used to compare with published data where appropriate. In addition, rigorous analytical approach to design is avoided and detailed design information is not provided.

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