Spindle motor control circuit

Details Spindle motor control circuit Spindle motor control circuit

1989-07-19

1991-08-06

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 7301, G11B 1546

Patent

active

050382322

ABSTRACT:
A spindle motor control circuit 20 for controlling the acceleration and position locking of a spindle motor 22 includes a first mode of operation whereby the spindle motor 22 is commutated through use of an external clock 32, 34. The control circuit 20 then causes the spindle motor 22 to be self-commutation based on the clock developed from transitions detected by a transition detector 71, which transitions are signals provided from the phase windings of the spindle motor 22. A final mode includes the reading of servo information from the servo sectors on the disc in order to control the final acceleration and position of the spindle motor 22.

REFERENCES:
patent: 4236050 (1980-11-01), Winslow et al.
patent: 4371818 (1983-02-01), Lewis
patent: 4774595 (1988-09-01), Miyake
patent: 4815063 (1989-03-01), Aoshima et al.
patent: 4843288 (1989-06-01), Volz et al.
patent: 4918544 (1990-04-01), Ishizuka et al.
patent: 4928029 (1990-05-01), Wright

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