AN1914 Freescale Semiconductor / Motorola, AN1914 Datasheet - Page 17

• Manufacturer Part Number: AN1914
• Description: 3-Phase BLDC Motor Control with Sensorless Back EMF Zero Crossing Detection Using DSP56F80x
• Manufacturer: Freescale Semiconductor / Motorola

PWM1 S
PWM2 S
PWM3 S
PWM4 S
PWM5 S
PWM6 S
PWM1 S
PWM2 S
PWM3 S
PWM4 S
PWM5 S
PWM6 S
I
I
I
I
I
A
B
I
C
A
B
C
At
Ab
Bt
Bb
Ct
Cb
At
Ab
Bt
Bb
Ct
Cb
Figure 5-3. BLDC Commutation with Bipolar (Hard) Switching
Figure 5-2. 3-phase BLDC Motor Commutation PWM Signal
A-off
A-off
A-off
DSP56F80x MC PWM Module in Motor Control Applications
commutation
0
Freescale Semiconductor, Inc.
C-off
C-off
C-off
commutation
For More Information On This Product,
60
Commutation
B-off
B-off
B-off
commutation
Go to: www.freescale.com
120
60
A-off
A-off
A-off
commutation
180
C-off
C-off
C-off
commutation
240
Commutation
B-off
B-off
B-off
commutation
120
300
A-off
A-off
A-off
commutation
360
C-off
C-off
C-off
electrical angle
electrical angle
Control Technique
17