Removable type magnetic recording/reproducing device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
N/A
app pub date -
Jan 9, 2001
filing date -
Jan 14, 1997
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
In a motor drive for driving a motor having three-phase coils in both a high rotation speed mode making the motor at a high rotation speed and a low rotation speed mode making the motor at a low rotation speed which is extremely lower than the high rotation speed, the motor drive comprises a mode selection circuit for making a connection of the three-phase coils unipolar and bipolar connections on the high and the low rotation speed modes, respectively. A frequency generation pattern detects a rotation speed of the motor. On the basis of the rotation speed detected by the frequency generation pattern, a combination of a PLL circuit and a driving transistor drives the motor at the high and the low rotation speeds on the high and the low rotation speed modes, respectively.
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