The motor may be bigger because it is 1800 rpm vs 3600 rpm for the siren. That does not mean it will do better as a phase converter. As others have said, 2x hp minimum, especially with no balancing capacitors to bring voltage on generated leg up. Rule of thumb for generators and motors is I believe ...

You do not really need a siren specific control box. You will need a motor starter, I think a NEMA size 3 (careful when you look as the single phase horse power will be rated lower and what you need to go by) with appropriate overloads to protect the motor as ones that large are not usually internal...

I’ve used both phase converters and VFD’s. The VFD in my opinion is the way to go, alows long ramp time so no start surge, efficient, small, and simple to start/run once set up. That said, if the siren is the only forseable three phase equipment you will own replacing with a single phase motor is th...

With what you are asking you really probably need to get someone who knows what they are doing with electricity to assist you. This is a bit more involved than just plugging into an outlet with more to go wrong. A dryer outlet is not going to be enough. The only outlet in a residential setting that ...

A generator is not going to be cheap regardless. I’d say you are probably best off looking for a military surplus unit as they have better motor start ability than a civilian unit, also are available 3 phase in smaller sizes. They used be cheap, not so much anymore. The only kind I ever see that are...

As far as rotary, for a siren go twice the hp at a minimum. More is better.

You probably won’t run it long enough for bearing damage, more of a long term thing from my understanding. Old winding a bigger concern, use a load reactor on the drive. If going rotary just get a cheap three phase motor and build your own. With the 50a outlets drive probably would be better. Don’t ...

Driving the motor wouldn’t be hard from batteries, but I also doubt it could be done for $3000. I think some manufactures have off the shelf VFD drives that will accept a dc input into their buss(all of them rectify to dc anyway). That could be powered from batteries but the major issue being it wou...

I haven’t seen one in person, but most solenoids I’ve seen where rather simple coils. Personally I’d probably get some magnet wire and re wind it myself.
Has anyone here attempted that?

Better depends on your application. For municipalities three phase would generally be preferred. Smaller wires, simpler motors, cheaper motors. However, for most siren enthusits single phase would be preferred or even required to be able to run a siren. A normal residence dose not have three phase a...