AN1917D Freescale Semiconductor / Motorola, AN1917D Datasheet - Page 6

• Manufacturer Part Number: AN1917D
• Description: 3-Phase PM Synchronous Motor Control with Quadrature Encoder Using DSP56F80x
• Manufacturer: Freescale Semiconductor / Motorola

6
Target Motor Theory
For a common 3-phase PM Synchronous motor, a standard 3-phase power stage is used. The same
power stage is used for AC induction and BLDC motors. Such a power stage for 3-phase PM
Synchronous motors is illustrated in
independent switching. The power transistors are switched in the complementary mode. The sinewave
output is generated using a PWM technique.
Figure 3-3. Sinewave Voltage Output Applied onto a PM Synchronous Motor
Voltage
Output
U
DCB
GND
0
C1
PWM_Q1
PWM_Q2
60
3-Phase PMSM Control with Quadrature Encoder
Freescale Semiconductor, Inc.
Phase A
For More Information On This Product,
Figure 3-4. 3-Phase Power Stage
120
Q1
Q2
Go to: www.freescale.com
Figure
Phase_A
PWM_Q3
PWM_Q4
3-4. The power stage utilizes six power transistors with
180
Phase B
240
Q3
Q4
Phase_B
PWM_Q5
PWM_Q6
300
Phase C
360
Q5
Q6
Phase_C
Electrical
Angle
MOTOROLA