Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1981-09-28
1983-02-01
Wolff, John H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360105, G11B 554, G11B 2102
Patent
active
043719031
ABSTRACT:
In a disc drive including a disc having a magnetic surface and supported for rotation on a spindle, a spindle motor for driving the spindle, a linear motor having a positioner coil for radially moving a head support structure along the disc surface, and a circuit responsive to an emergency condition for causing the linear motor positioner coil to retract the head support structure, there is disclosed an improvement wherein the spindle motor is a rotating magnet DC motor and the kinetic energy stored in the rotating spindle mass is used to provide the energy required to unload the heads upon the occurrence of an emergency situation. Under emergency conditions, the spindle motor windings are switched directly to the linear motor positioner coil and the spindle motor acts as a generator to supply the head retract energy.
REFERENCES:
patent: 3473099 (1969-10-01), Miller
patent: 3626264 (1971-12-01), Halfhill et al.
patent: 3629679 (1971-12-01), Halfhill
patent: 3956766 (1976-05-01), Hanson et al.
patent: 4005485 (1977-01-01), Opocensky
patent: 4237501 (1980-12-01), Barmache et al.
patent: 4241366 (1980-12-01), Nishida et al.
DMA Systems Corporation
Wolff John H.
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