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AN-1090のメーカーはInternational Rectifierです、この部品の機能は「Controller Dynamics and Tuning」です。 |
部品番号 | AN-1090 |
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部品説明 | Controller Dynamics and Tuning | ||
メーカ | International Rectifier | ||
ロゴ | |||
このページの下部にプレビューとAN-1090ダウンロード(pdfファイル)リンクがあります。 Total 15 pages
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15
Application Note AN-1090
IRMCF3xx Series Controller Dynamics and Tuning
By Eddy Ho, International Rectifier
Table of Contents
Page
Introduction .......................................................................................................... 2
Current Controller................................................................................................. 2
Speed Controller .................................................................................................. 6
Field-Weakening Controller ................................................................................ 10
Critical Over Voltage Protection ......................................................................... 12
Interior Permanent Magnet Motor Control .......................................................... 14
This application note describes how to tune the embedded control loops on the
IRMCF3xx series of control IC’s. This covers the IRMCF312, IRMCF311 and
IRMCF343 digital control IC’s for air-conditioning systems and the IRMCF341 IC
for washing machine applications. The control loops include the ID and IQ current
control loops, the velocity control loop, the field weakening loop, IPM control and
bus voltage protection. The note describes the equations used to derive the
control loop constants and experimental methods to tune control constant
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Current
Command +
-
KxIreg
1
S
Controller
+
A
+
Motor
V1
R (1 + S T)
I
KpIreg_D
B
Figure 1. Current Control Dynamics
Current
Command +
-
Controller
Motor
KxIreg (1 + S (KpIreg_D/KxIreg))
S
C(S)
V1
A
R (1 + S T)
I
B
Figure 2. Pole Zero Cancellation
Current
Command +
-
Controller
Motor
KxIreg
S
V
A
1
R
B
I
1
1 + S Tc
Tc = R/ (KxIreg*A*B)
Figure 3. Simplified Current Control Dynamics Due to Pole Zero Cancellation
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Speed Controller
The speed controller is the most outer-loop controller in a cascaded speed drive system. Figure 6
shows the cascaded control dynamics of the speed control loop. In practice, the inner current
loop has much higher control bandwidth than the speed controller, therefore for speed control
dynamic purpose, the inner current loop can be ignored as shown in Figure 7. Parameter M
(Figure 7) relates command current digital counts to actual current in Amps. The motor
mechanical dynamic is a first order function with mechanical time constant equals to J/F
(Inertia/Friction). Pole-zero cancellation technique (outlined in current regulator tuning section)
can be used to simplify tuning of the speed controller proportional and integral gains (KpSreg,
KxSreg). In practice, information on mechanical friction (F) is difficult to obtain. In addition,
temperature dependent friction characteristic is present in some applications. Therefore, manual
speed tuning may be required to achieve optimal speed response. Some applications cannot
tolerate high speed regulator bandwidth due to mechanical resonance present in mechanical
arrangement.
Speed
Command
Speed
Regulator
KxSreg
+
-
+
-
KpSreg
1
S
Filter
SpdFiltBW
++
-
+
Speed
Estimator
KxIreg
Controller
Current
Regulator
11
+
A
S
+
KpIreg
B
Motor
V1
R (1 + S T)
Load
-
I
Kt
1/J
+
-
1
S
F
Speed
J - Inertia
F - Friction
Kt - Torque constant
A, B, C - Conversion Gains
Figure 6. Cascaded Control Dynamics
Speed
Command
Speed
Regulator
KxSreg
+
-
+
-
KpSreg
controller
1+
S
+
Motor
Load
-
+
1
M Kt 1/J
-S
J - Inertia
F - Friction
Kt - Torque constant
C, M - Conversion Gains
F
Filter
C
SpdFiltBW
Figure 7. Simplified Speed Control Loop Dynamics
Speed
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ページ | 合計 : 15 ページ | ||
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部品番号 | 部品説明 | メーカ |
AN-1090 | Controller Dynamics and Tuning | International Rectifier |
AN-1097 | IRS2011 and IR2011 Comparison | International Rectifier |