On Tue, Jan 4, 2022 at 8:36 PM Grant Taylor via cctalk < cctalk@classiccmp.org> wrote:
> My limited understanding is that VFDs simulate / emulate various > frequencies by turning the output on and off (at full input voltage) > such that the (sliding) /average/ of the output looks like it's a at a > lower voltage. That's how all buck switching power supplies work. It's just a question of how much low-pass filtering you do on the output. A switching power supply to power sensitive electronics that requires good voltage regulation and low ripple contains electrolytic capacitors on the output. A VFD may or may not. The specs on the VFD should tell you about the output characteristics. If you're just going to power a three-phase synchronous motor, then no filtering is needed. The inductance of the motor windings and the mechanical characteristics of the motor will filter it just fine.
