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Registered Member #16018
Joined: Fri May 03 2013, 07:19PM
Location:
Posts: 53
I live in a area where there is no three phase. I think that rotary phase converters are expensive to but and there is not uncharted info on the web about them.
PS I am using it for a mot stack what would be a good hp
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
With varying degrees of cheapness and easiness
1) Move to an area with three phase
2) Buy or build a triple inverter, fed from a PFC corrected DC supply fed from your single phase. Presumably you will want to draw lots of power, so anything other than PFC corrected will be very anti-social
3) See if you can score a rotary converter off eBay
4) Get a large 3 phase motor. Run it on one phase, starting it either with capacitor to another phase, or spinning it up with an electric drill. It will then run as a motor/generator in one, producing three phases which may or may not have some degree of balance. * This is probably the editor's choice *
5) Use a phase lead and a phase lag network to produce two more phases from your single phase. This tends only to work well for one fixed load, the balance will go all over the place as the load changes.
6) Your area *will* be supplied by 3 phase (for area = large enough), they just won't all come out together in one premises. Walk up and down your road dragging a long wire behind you, chatting to the neighbours. Measure the voltage from their phase to the wire you have in your hand. Roughly 0v = same phase. Roughly 1.7 * phase voltage, another phase. Recruit two neighbours on two different phases for a three phase party. By the way, I didn't suggest this. It contravenes common sense for safety, and probably the supply company's byelaws. Depending on how the meters are implemented, a line current with no neutral current flowing could look like tampering, which could get you into trouble. It will trip any GFI or RCD devices, you would need to use a huge common mode choke at each premises to force the correct neutral current to flow.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
If you are going to power a MOT stack, I see no other solution than using a large 3 phase gasolin driven generator, you will need one with that can supply double the wattage rating of what you will consume.
Dr. Slacks ideas of building converters or use motors run on one phase have the problem that you still only have the power available from a single phase, now distributed out on 3, so you wont gain any total current advantage.
I have a general feeling from most of your threads here on the forum that you are seeking for the most highest voltages, highest currents etc without having the proper background knowledge from experimenting with smaller circuits first.
What is the scope of building a 3 phased MOT stack? Why do you ask for larger transformers than MOTs in another thread? If you just want to draw long arcs there are better alternatives in building a HV SMPS.
Registered Member #311
Joined: Sun Mar 12 2006, 08:28PM
Location:
Posts: 253
What is the reason for wanting 3-phase if it's something you're building yourself, as opposed to an existing 3-phase device? Any conversion solution will have some loss, so running direct off the single phase supply is going to give the most power.
Registered Member #3324
Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276
mikeselectricstuff wrote ...
What is the reason for wanting 3-phase if it's something you're building yourself, as opposed to an existing 3-phase device? Any conversion solution will have some loss, so running direct off the single phase supply is going to give the most power.
I Agree with this, however i was looking into designing a six-phase or three-phase HV inverter for some reason @ 10Kw, i think it was to bring down IGBT cost.. but you also needed more of them... so i scrapped that for now.
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What is the cheapest and most easy way to get three phase
