Three-phase generator boost circuit
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United States of America Patent
Stats
-
Feb 1, 2000
Grant Date -
N/A
app pub date -
Jul 23, 1999
filing date -
Feb 19, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A three-phase generator boost circuit for augmenting the back electromotive force produced by a spindle motor of a disk drive is disclosed. First and second nodes provide normal connection to a source of DC voltage for the spindle motor and a second motor connected between the first and second nodes. A commutator is connected to a sequencer to operate the spindle motor. In the event of catastrophic shutdown, two of the lower commutator switches are operated to short circuit the two stator coils having the highest and lowest voltages to store energy in the coils. The commutator switches are then operated to discharge current through the nodes to a storage capacitor for the second motor.
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