Converter reactor selection problem - Database & Sql Blog Articles

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1. Selection of rated AC current The rated AC current is the long-term operating current of the reactor designed from the aspect of heat, and sufficient high-order harmonic components should be considered. That is, the current actually flowing through the output reactor is the output current of the inverter motor load.
2, voltage drop voltage drop refers to the actual voltage drop across the reactor coil when the actual rated current is 50HZ. Usually choose a voltage drop of about 4V ~ 8V.
3, the choice of inductance The rated inductance of the reactor is also an important parameter! If the inductance is not properly selected, it will directly affect the voltage drop under the rated current, causing a malfunction. The amount of inductance depends on the cross-sectional area of ​​the reactor core and the number of turns of the coil and the adjustment of the air gap.
The selection of the inductance of the output reactor is determined according to the length of the cable within the rated frequency range, and then the cross-sectional area of ​​the core and the cross-sectional area of ​​the conductor under the corresponding inductance are selected according to the actual rated current of the motor to determine the actual voltage drop. .
4, the inductance and cable length corresponding to the rated current:
Cable length rated output current inductance
300 meters 100A46μH
200A23μH
250A16μH
300A13μH
600 meters 100A92μH
200A46μH
250A34μH
300A27μH
The ideal reactor should be kept constant at rated AC current and below. As the current increases, the inductance decreases.
When the rated current is more than 2 times, the inductance is reduced to 0.6 times the rated inductance.
When the rated current is greater than 2.5 times, the inductance is reduced to 0.5 times the rated inductance. When the rated current is greater than 4 times, the inductance is reduced to 0.35 times the rated inductance.