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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： | 12/15页 |
| 文件大小： | 269K |
| 代理商： | AN-1090 |
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Figure 17. Field-Weakening Control Responses,
Vertical: Id command (digital counts) Horizontal: Time (0.1 sec/ div)
Critical Over Voltage Protection
In order to achieve high-speed operation under limited voltage capability, motor flux is
suppressed by injection of a negative d-axis current (Field-weakening) to the motor. In case of an
inverter shunt down at high speeds, all inverter devices will be disabled and the negative d-axis
field forcing will be lost. Under such circumstance, the motor flux will resume and motor voltage
will build up according to motor Ke as shown in Figure 18. This is a critical over voltage condition
in which the motor BEMF builds up and charges the dc bus capacitor voltage to an exceedingly
large value.
Inverter
shunt down
M
Speed
M
Inverter
voltage
Limit
Voltage
increase
Speed
Figure 18. Inverter Shunt Down during Field-Weakening
In iMotion control IC (3xx series), the critical over voltage protection is implemented in MCE
application software. Critical over voltage condition is detected by comparing dc bus voltage
feedback to a configurable voltage level (configurable by Parameter Configurator: dc bus critical
voltage). When critical over voltage is detected, command bit CriticalOv (inputs of MCE module
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