Can I use a VFD as a voltage converter?

In one word, no. A VFD cannot be used as a replacement for a voltage transformer. If a motor requires 400Vac, then a 400Vac source is required as an input to the 400Vac VFD. The same goes for other voltage classes, The only exception to this rule is with phase number....

What type of VFD Inverter drives are there?

The FREQROL VFD inverter drive series are available in the following flavors: FR-CS80 – Compact type: Entry-level inverter FR-D700 – Compact type: Compact \ standard FR-E700 \ FR-E800 – Modular type: All-rounder. FR-F800 – Modular type:...