In my opinion, the only reason you might want a static converter is if the entire project absolutely has to be done dirt cheap, and it's for a simple, basic motor like a bench grinder or a coolant pump.įor virtually anything else, get a VFD- especially if you're trying to run a mill or lathe. The drawback is they cost a bit more, and take a bit more work to wire in (you aren't supposed to have switches between the VFD and the motor, so you have to wire the machine's controls to operate the VFD controls. This is a much better unit, giving true 3-phase power to the motor, and providing a wide range of additional features, such as infinitely variable speed, soft-start, instant reversing, and so forth. The device with the digital readout, however, is a VFD, a Variable Frequency Drive. The benefit is that they're dirt-cheap, if cost is an issue and the power loss isn't.
The one that only gives 2/3rds power is a Static Phase Converter, and basically just runs the motor on two of it's three phases.
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