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Analysis of Three Synchronous Drive Modes for the Starting Performance of Spindle Motors

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4 Author(s)
S. Lin ; Data Storage Inst., Singapore ; C. Bi ; Q. Jiang ; H. N. Phyu

In sensorless operation of spindle motors in hard disk drives (HDD), open-looped starting is used to spin up the motor from standstill to a speed that is high enough to reliably detect back-electromotive force (back-EMF) generated in the armature windings. Then the back-EMF zero-crossing points (ZCP) will be used to detect speed and position for closed-looped control. This paper studies three open-looped starting modes for spindle motor. Six-step, which is currently used in HDD, twelve-step, and sine wave starting are illustrated and compared. The simulation results show that twelve-step and sine wave starting can obtain much better starting performance for spindle motors.

Published in:

IEEE Transactions on Magnetics  (Volume:43 ,  Issue: 9 )