AN1931D Freescale Semiconductor / Motorola, AN1931D Datasheet - Page 14

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

Target Motor Theory
3.3.4 PMSM Vector Control and Field-Weakening Controller
3.3.4.1 Control in Normal Operating Range
14
Figure 3-8.
The backward (Inverse Park) transformation (from d-q to
This section describes the control regarding the required stator current vectors i
There are two speed ranges (shown in
Assume an ideal PM synchronous motor with constant stator reluctance, L
(EQ
•
•
Figure 3-8. Establishing the d-q Coordinate System (Park Transformation)
3-17.),
Control in Normal Operating Range is a control mode for a speed required below nominal
motor speed
Control in Field-Weakening Range is a control mode for a speed required above nominal
motor speed
illustrates this transformation.
(EQ 3-18.)
q
u
Sq
and
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=
3-Phase PM Synchronous Motor Vector Control
For More Information On This Product,
R
=
(EQ 3-19.)
S
i
Sq
M
cos
sin
+
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L
Field
Field
S
Figure
t d
d
can then be written as:
i
Sq
–
cos
sin
+
3-9), which differ by controlled current vector:
F
Field
Field
L
S
i
M
Sd
d
q
M
+
is:
M
Field
d
s
= const. The equations
sd
, i
sq
.
MOTOROLA
(EQ 3-29.)
(EQ 3-30.)