Method and apparatus for retracting head and braking motor of a disc drive device
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United States of America Patent
Stats
-
Apr 14, 1987
Grant Date -
N/A
app pub date -
Mar 5, 1986
filing date -
Mar 5, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The head assembly of a disc drive device is retracted upon the interruption of power to that device by utilizing the emf that is generated by the disc drive spindle motor as a result of the rotation of that motor following power interruption. Then, after a delay sufficient to allow the head assembly time to retract, the spindle motor is dynamically braked. Dynamic braking is achieved by utilizing a voltage to which a capacitor has been charged during normal operation to energize switching elements which effectively short circuit the motor windings.
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