Motor control method for magnetic disk drive

Details Motor control method for magnetic disk drive Motor control method for magnetic disk drive

2005-03-22

2005-03-22

Sniezek, Andrew L. (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

C318S254100

Reexamination Certificate

active

06870700

ABSTRACT:
The motor drive method is for a magnetic disk drive apparatus having a magnetic disk as an information recording medium, a magnetic head for recording/reproducing information to/from the magnetic disk, and a motor for driving the magnetic disk, the motor having a connection point connecting middle points in a multi-phase Y-connection and capable of realizing a unipolar drive method for successively exciting phases and a bipolar drive method for simultaneously exciting two adjacent phases, wherein the unipolar drive method is selected when the temperature in the magnetic disk drive apparatus is lower than a predetermined temperature and the bipolar drive method is selected when the temperature exceeds the predetermined temperature. The motor stationary rotation is assured by selecting the unipolar drive method or the bipolar drive method.

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patent: 6078158 (2000-06-01), Heeren et al.
patent: 6169381 (2001-01-01), Arai et al.
patent: 6201657 (2001-03-01), Shimizu et al.
patent: 6633450 (2003-10-01), Kaneko
patent: 6753667 (2004-06-01), Sakamoto
patent: 2220283 (1991-04-01), None

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