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參數(shù)資料
| 型號： | L6238 |
| 廠商： | 意法半導體 |
| 英文描述： | Sensorless Spindle Motor Driver(無傳感器主軸電機驅(qū)動器) |
| 中文描述： | 傳感器主軸電機驅(qū)動器（無傳感器主軸電機驅(qū)動器） |
| 文件頁數(shù)： | 14/35頁 |
| 文件大?。?/td> | 383K |
| 代理商： | L6238 |
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must be low enough so that the motor can follow
without slipping. This implies that to have a reli-
able algorithm, the initial frequencyand ramp rate
must be chosen for the worst case motor under
worst case conditions.
4.0 DIGITAL PLL MOTORSPEEDCONTROL
4.1 Phase Detector
The internal Phase/Frequency Detector of the
PLL has two inputs:
- referenceinput (Fref)
- feedbackinput (Fmtr)
The feedback Input is multiplexed between the in-
ternal Bemf Zero Crossing Detector and an exter-
nallyprovidedsync pulse
(EXT INDEX)
Shown in figure 10 is the classical state diagram
for a phase detector along with waveform exam-
ples.
Positive phase is defined as when the reference
falling edge occurs before the falling edge of
Fmotor and the motor speed must be increased.
Negative phase is just the opposite, requiring a
slowingof the motor speed.
As an example, the top four waveforms in figure
10 represent a positive phase condition. In this
case the ”up” signal would go low since the refer-
ence signal went low before the appearance of a
negative transition of fmotor. The falling edge of
fmotor causes the ”up” signal to revert back to a
high. The period while the ”up” signal is in a low
state is a functionof thephase difference.
Figure10:
PhaseDetector State Diagram.
L6238
14/35
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相關(guān)代理商/技術(shù)參數(shù) |
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