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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...
The drag torque of a hard disk drive (HDD) is a key variable to its spindle motor. It should be accurately tested during R&D and mass productions of HDDs. This paper reviews its existing measurement methods currently used by HDD industry first. Then an effective method to measure the drag torque is introduced. Through the proposed method, the drag torque can be measured more precisely and easily
The runout measuring machine for spindle motor in hard disk drive (HDD) using vision technology has been developed. The runout measuring machine performance analysis is necessary to prove the confidence of the measurement data. The measuring machine performance analysis is based on the measurement system specification measurement data and international measurement standards. This paper briefly describes...
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