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AN2009 Datasheet(PDF) 6 Page - STMicroelectronics

Part # AN2009
Description  PWM MANAGEMENT FOR 3-PHASE BLDC MOTOR DRIVES USING THE ST7MC
PDF  39 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2009 Datasheet(HTML) 6 Page - STMicroelectronics

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PWM MANAGEMENT FOR 3-PHASE BLDC MOTOR DRIVES USING THE ST7MC
Figure 3. Reading the BEMF (Step
Σ4)
Figure 4. Six-step, 120° drive: control signal on the transistor gate
C
A
B
HV
T4
T1
T0
T3
T2
T5
D0
D2
D4
D3
D5
D1
Read BEMF
on phase C
BEM
F
M
T0
T1
T2
T3
T4
T5
A
B
C
Node
Step
Σ1
Σ2
Σ3
Σ4
Σ5
Σ6
Σ1
Σ2
Σ3
HV
0
HV
0
HV
0
Switch
BEMF Voltage
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Note: voltages are represented without any PWM or demagnetization effect.



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