公开(公告)号：WO1991001230A2

公开(公告)日：1991-02-07

申请号：PCT/US1990003848

申请日：1990-07-09

Applicant: SYQUEST TECHNOLOGY

Inventor： SYQUEST TECHNOLOGY ,  GRACE, Alan, G.

IPC: B60L0

CPC classification number: H02P6/14 ,  G11B19/28

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 (24) in order to control the final acceleration and position of the spindle motor (22).