AN1931D Freescale Semiconductor / Motorola, AN1931D Datasheet - Page 12

• Manufacturer Part Number: AN1931D
• Description: 3-Phase PM Synchronous Motor Vector Control
• Manufacturer: Freescale Semiconductor / Motorola

Target Motor Theory
3.3.3 Vector Control Transformations
3.3.3.1 Clarke Transformation
12
Transforming the PM synchronous motor into a DC motor is based on points of view. As shown in
Section
The following transformations are involved in Vector Control:
Figure 3-7.
•
•
Transformations from a 3-phase to a 2-phase system (Clarke transformation)
Rotation of orthogonal system
—
— d-q to
3.3.2, a coordinate transformation is required.
shows how the three-phase system is transformed into a two-phase system.
i
Sb - measured
phase- b
to d-q (Park transformation)
phase- c
(Inverse Park transformation)
Freescale Semiconductor, Inc.
3-Phase PM Synchronous Motor Vector Control
i
Sc - calculated
For More Information On This Product,
i
Figure 3-7. Clarke Transformation
SE
Go to: www.freescale.com
i
Sa - measured
i
S
i
SD
phase-a
MOTOROLA