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AN2388 датащи(PDF) 49 Page - STMicroelectronics

номер детали AN2388
подробное описание детали  Sensor field oriented control
PDF  54 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2388 датащи(HTML) 49 Page - STMicroelectronics

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AN2388
Software design
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************************************************************************************
**************************SVPWM Calculation Block Diagram*
************************************************************************************
************************
The right sector can be found it by means this simple rule.
Sector determination:
if Vref1>0 THEN A_Sector=1, ELSE A_Sector=0;
if Vref2>0 THEN B_Sector=1, ELSE B_Sector=0;
if Vref3>0 THEN C_Sector=1, ELSE C_Sector=0;
Sector= A_Sector+2* B_Sector+4*C_Sector
Inside the proper sector, it must be calculated the duration of the two sector boundary
vectors application as shown below:
Timing calculation
The final step is to compute the three necessary duty cycle to provide to power devices
depending on which sector the voltage vector defined by
.
f
C
E
x
inverse
Vdc
V
inverse
d
q
f
F
D
x
inverse
Vdc
V
inverse
qSqrt
f
A
x
inverse
Vdc
V
inverse
qSqrt
n
n
n
15
.
1
0
4
0
_
_
*
2
3
_
2
3
15
.
1
0
2
0
_
_
*
2
3
_
2
15
.
1
11
5
0
_
_
3
_
⎯→
⎯
=
=
⎯→
⎯
=
=
⎯→
⎯
=
=
Calculate voltage reference
Evaluate sector and duration of two
boundary vectors
Compute the 3 necessary duty
cycles assigning to the right
motor phase according to the sector
β
α V
V ,



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