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Disk Drive Motor Speed Control Disclosure Number: IPCOM000052074D
Original Publication Date: 1981-Apr-01
Included in the Prior Art Database: 2005-Feb-11

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Bellamy, LR Luciani, JD [+details]


Digital control techniques are employed to control the speed of a motor driving a magnetic disk file. Disk motor speed control was formerly achieved by microprocessor algorithms which corrected the motor phase table depending on the history of former early or late sector marks recorded on the disk. The present technique achieves a 5 times improvement in speed accuracy by the use of a digital control method.