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| 型号： | AN-1090 |
| 厂商： | International Rectifier |
| 英文描述： | Controller Dynamics and Tuning |
| 中文描述： | 控制器动力学和调整 |
| 文件页数： | 14/15页 |
| 文件大小： | 269K |
| 代理商： | AN-1090 |
15
In addition to the iMotion control IC, gate driver IC (IRS2631) of the iMotion chip set also provides
over voltage protection. The gate driver IC can be configured to protect dc bus over voltage in the
event of control IC failure using also the zero vector injection method.
Interior Permanent Magnet Motor Control
The motor torque developed by a permanent magnet motor is given by:
(
q
d
q
d
q
I
I
L
L
I
FluxM
2
Where
P
number of rotor poles
L
d
, L
q
d and q-axis inductance (d axis aligns to rotor magnet).
I
d
, I
q
d and q-axis current components.
FluxM
Flux linkage of permanent magnet
There are two torque components associated with the motor torque equation. The first
component (Cylindrical torque) is due to interaction between rotor magnet flux and stator q-axis
current. The second component (reluctance torque) is due to motor saliency (difference in d and
q inductance). This saliency term is negligible (Ld = Lq) in Surface Mounted Permanent magnet
(SPM) motors. In the case of an Interior Permanent Magnet Motor (IPM) where Lq not equal to
Ld, the torque per ampere rating is boosted by the saliency torque term. In motoring operation, a
negative Id injection will contribute to the increase in reluctance torque.
Figure 21a shows the current vector trajectory for optimal torque per ampere generation of an
IPM motor. As current magnitude increases, the current angle advancement also increases which
indicates an increase in d-axis current demand in the negative direction. The required current
angle for optimal torque per ampere generation is depicted in Figure 21b. In iMotion control IC,
this optimal current characteristics is approximated by a linear fit as shown in Figure 21b. Two
parameters (AngDel and AngLim) are used to characterize the behavior of optimal current angle
for generating maximum torque per ampere. Parameter AngDel fixes the slope of the linear line
and parameter AngLim limits the maximum allowable angle advancement. Parameter
configurator computes AngDel with 2 points (zero and rated current point). The implementation of
this linear interpolation and the calculation of command d-q current are shown in Figure 22.
www.irf.com
14
)
(
)
P
Torque
+
=
Cylindrical
Torque
Reluctance
Torque
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