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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： | 10/15页 |
| 文件大小： | 269K |
| 代理商： | AN-1090 |
15
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10
Field-Weakening Controller
Field weakening is required for wide speed range applications. Back EMF (BEMF) of a motor
increases with speed up to the point that inverter output voltage reaches its maximum level.
Further increase in motor speed requires flux weakening to maintain the motor terminal voltage at
its maximum possible level as shown in Figure 13.
M
Speed
M
Inverter
voltage
Limit
Crossover
Speed
Figure 13. Field-Weakening Characteristics
Figure 14 shows a block representation of the Field-Weakening Controller dynamics. The output
of the controller (Fwk_Id) represents a d-axis current component, which opposed the rotor
magnet flux (Flux). By injecting a negative d-axis current, the resultant flux can be reduced and
hence the motor voltage can be limited to stay within the ceiling voltage of the inverter output.
The control loop gain increases with motor frequency as shown in Figure 14. Inside the Field-
Weakening controller, gain modulation is used to decouple the variation of loop gain due to motor
frequency.
-
+
Modulation
level
Ld
Motor
Frequency
Flux
+
+
Voltage to
modulation
conversion
Motor
Controller
Field-
Weakening
Controller
Fwk_Id
B
Figure 14. Field-Weakening Control Dynamics
Figure 15 shows the Field-weakening controller. This controller is implemented in the MCE
application. As can be seen from this figure, when modulation exceed a prescribed level specified
by FwkLvl, a negative d-axis current (Fwk_Id) will start and lowering down the main flux. The
Field-Weakening controller acts as a modulation index limiter. The gain modulation block serves
to compensate the increase in loop gain due to increase in motor frequency as mentioned earlier.
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