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AN2009 bảng dữ liệu(PDF) 34 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  PWM MANAGEMENT FOR 3-PHASE BLDC MOTOR DRIVES USING THE ST7MC
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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AN2009 bảng dữ liệu(HTML) 34 Page - STMicroelectronics

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PWM MANAGEMENT FOR 3-PHASE BLDC MOTOR DRIVES USING THE ST7MC
7.3 REGISTERS CONFIGURATION TO ACCELERATE THE DEMAGNETIZATION.
The ST7MC allows you to program different PWM configurations in sensorless mode. In
sensor mode, the demagnetization event is useless as the feedback information is not read
from the windings.
In order to minimize the demagnetization time in sensorless mode, the ST7MC allows you to
modify the PWM direction between the step commutation and the end of demagnetization.
In sensorless mode the OS2 bit in register MCRB enables the PWM on the high side or low
side channels between the commutation and the demagnetization event.
Table 3. OS bits in MCRB register
D event: Demagnetization
C event: Commutation
Z event: BEMF zero voltage crossing event
OS2 bit
PWM after C and
before D
OS1 bit
PWM after D and
before Z
OS0
PWM after Z and
before next C
0
On High Channels
0
On High Channels
0
On high
channels
1
On low
channels
1
On Low Channels
0
On high
channels
1
On low
channels
1
On Low Channels
0
On High Channels
0
On high
channels
1
On low
channels
1
On Low Channels
0
On high
channels
1
On low
channels



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