In article , Ignoramus5833 says...

You should ask about balancing capacitors and phase angle correction
capacitors.

Hm, I thought that you did not use capacitors.

Correct. Most purists consider this to be an abomination. :^)

Also you really should have at least one contactor in the setup
which will drop out (self-holding) if you lose power while the
converter is running.

Do you mean that the contactor would open a 3 phase circuit of the
power is lost on the 2 phase circuit?

No. It drops out the incoming 240 volt single phase power.
Consider the following failure mode: You are running stuff in
your shop with the converter spun up. You go upstairs to get
lunch and leave it running. While you are up there, the power
goes out and the idler motor spins down to a stop.

In the heat of the moment you forget what state the thing is
in.

The power now comes back up.

The idler motor is now 'locked rotor' and will draw a large
fault current. If for some reason the breaker or fuses do
not pop, you have a problem on your hands. A drop-out contactor
prevents this problem and is a 'must-have.'

As a data point, my setup will easily start and plug-reverse one hp
load motors, and is powered off a 15 amp 240 volt branch ckt.

Jim


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