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PDF AN-1090 Data sheet ( Hoja de datos )
| Número de pieza | AN-1090 | |
| Descripción | Controller Dynamics and Tuning | |
| Fabricantes | International Rectifier | |
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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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Once current regulator diagnostic is executed, step current response can be observed from trace
function or current probes on w-phase. It is recommended to use current probe to observe step
current response. Figure 4 shows (current probe) the step current response of w-phase when
Current Reg diagnostic function is executed. In this figure, 25% step rated motor current is
commanded. The step level can be controlled by parameter ParkI (inside Current Reg Diagnostic
function). Figure 5 shows the expanded version of Figure 4. The measured current loop response
is critically damped at 0.65 msec time constant (0 – 66.3% of final steady value), which is
approximately equal to the anticipated current regulator bandwidth response (1/1500 =
0.667msec).
25%
0%
Figure 4. Step Current Response
0.65 msec
Figure 5. Step Current Response (Expanded Time Scale)
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Speed
Gain
Modulation
FwkLvl
FwkKi
+
-
FwkKxMod
Gain
Integrate
and
Output limit
Fwk_Id
(to Inner-loop IdRefExt)
- FwkLim
Dv (Sensorless Foc
output)
modulation
computation
Qv (Sensorless Foc
output)
Figure 15. Field-Weakening Controller Block
With gain modulation incorporated, the control loop gain is decoupled from motor frequency.
Figure 16 shows a simplified representation of the Field-weakening control dynamic. The
equivalent transfer function of Figure 16 is a first order lag system. Parameter M in Figure 16 is a
function of motor inductance, nominal dc bus voltage and the motor crossover frequency (function
of motor Ke). Parameter configurator sets the field-weakening controller gain (FwkKi) based on
parameter M and a prescribed field-weakening loop response (0.25 sec).
FwkKi
Modulation
level +
-
1
M
S
Figure 16. Simplified Field-Weakening Control Dynamics
The response of the Field-weakening loop can be observed from the command d-axis current
(using MCEDesigner trace function). Under light Field-weakening condition (-10% rated motor
current on field-weakening controller output current), a step change (-2%) in the modulation limit
level (FwkLvl) is issued. When modulation limit reduces, the Field-Weakening controller
increases d-axis motor current (negative) in order to reduce motor flux and satisfy the modulation
limit (voltage limit). Figure 17 shows a step change in FwkLvl and the response of the command
d-axis current. First order response is exemplified from Figure 17. The tuning of the Field-
Weakening controller is straightforward since it only involves one controller gain. The response of
the Field-Weakening controller should be high enough to catch up with speed changes. In
practice, most appliance applications do not require high dynamic speed changes in Field-
Weakening region. Therefore the response of Field-weakening can be relaxed (typically: 0.1 to
0.4 sec response time. Parameter configurator preset to 0.25sec).
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| PDF Descargar | [ Datasheet AN-1090.PDF ] | |
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