The output reactor is mainly used in industrial automation system engineering, especially when the inverter is used, it is used to extend the effective transmission distance of the inverter, and effectively suppress the instantaneous high voltage generated when the IGBT module of the inverter is switched.
There are two types of output reactors:
1.1, iron core output reactor
A core output reactor is used when the carrier frequency of the inverter is less than 3KHZ.
1.2, ferrite output reactor
When the carrier frequency of the inverter is less than 6KHZ, a ferrite output reactor is used.
In order to compensate for the influence of the distributed capacitance of the connecting cable between the inverter and the motor, the harmonics of the inverter output are effectively suppressed, and the noise of the inverter is reduced to avoid premature aging of the motor insulation or early damage of the motor. The output reactor installed in the input and output protection circuits of the inverter is used to reduce the du/dt value at the motor terminals. When a long cable is connected between the inverter and the motor, the output reactor can reduce the peak value of the load current. However, an output reactor set at the output of the frequency converter cannot be used to reduce the peak value of the transient voltage on the motor.
Output reactors play a major role in the following two aspects:
1. Increase the effective transmission distance of the inverter
When the length of the cable output from the inverter to the motor is greater than the specified value of the product, an output reactor should be added to compensate the charge and discharge of the coupling capacitor when the long cable runs, to avoid overcurrent of the inverter and increase the efficiency of the inverter to the motor. Transmission distance.
2, effectively suppress the instantaneous high voltage when the IGBT switch
The function of increasing the output reactor at the output of the inverter is to output the reactor to effectively suppress the instantaneous high voltage generated when the IGBT of the inverter is switched, and to reduce the adverse effect of this voltage on the cable insulation and the motor.
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