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VFD: Current Source Inverter (CSI)

The VFD current source inverter (CSI) uses an SCR input to produce a variable voltage DC link. The inverter section also uses SCRs for switching the output to the motor. The current source inverter controls the current in the motor. The motor must be carefully matched to the VFD.
VFD Current Source Inverter
Current spikes, caused by switching, can be seen in the output. At low speeds current pulses can causes the motor to cog.
VFD Current Source Inverter Voltage/Current curve

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