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#1

How to you create a 3 phase from one phase?

How to you create a 3 phase from one phase?
08-18-2013 10:17 PM
Top #2
The simplest method of creating a good 3 phase power source from a single phase source is to mechanically drive a 3 phase motor from a single phase motor. Other methods of accomplishing this electrically are readily available as well. Please do some research under the term "Phase converter". The approach best utilized is dependent on the amount of power required.
08-18-2013 10:18 PM
Top #3
Depends on the current/power needed to be drawn from the output and the application/load type, you can easily modify a 3ph/3ph double conversation UPS to use single phase input instead of 3 so you can get 3 please output from single phase source.
08-18-2013 10:19 PM
Top #4
Use 1-phase to 3-phase converter. In which you have to give 1-phase to rotor of generator and output will be 3-phase from stator. Only thing is that this converter generator should be design in winding in such a way so that rotor winding will induce 3-phase supply from stator.
08-18-2013 10:19 PM
Top #5
Variable frequency drives have been used to accept 240 volt single phase and will output 3 phase but need to be derated for the higher input phase currents. You statement does not provide any parameters such as voltage/capacity/application that would help in pointing towards a potential solution.
08-18-2013 10:20 PM
Top #6
Use winding change in motor. Rotor is of special made. Stator winding is designed to maintain 3-phase and use a capacitor in between two phase and output will be 3-phase.
We had designed in my previous company such a 1-phase to 3-phase generator. These converter are used in locomotives.
08-18-2013 10:21 PM
Top #7
If its an AC alternator whose nameplate indicates 3phase. Then its possible to change from parallel star to series star or vice versa (RESTRAPPING). But if the plate indicates single phase i don't think its possible based on the 120 degrees displacement concept between phase.
08-18-2013 10:22 PM
Top #8
One phase to three phase conversion can be useful only in domestic or in isolated environments. Anyway, besides limited scope, there are limitations of power. The efficiency is too low for extended uses. Can only be an emergency solution.
From the simple capacitor to sophisticated converters performance increase, suitable the price. Technical efficiency in opposition to financial.
Are usually more handy three phase sources.
08-18-2013 10:23 PM
Top #9
For less than 5 HP, by far the most efficient and easy way to convert single phase to three phase are the variable speed motor drives out that can be equipped with single phase front ends, and provide variable frequency three phase power. I have one on my Powermatic wood lathe (3 HP) and could not be happier, not just for the ability to use a three phase motor, but also soft start, dynamic breaking, speed control, and direction control.

A lot smaller and lighter than the rotophase options.

There are a lot of choices in this area, and you seem to get what you pay for in features.
08-18-2013 10:24 PM
Top #10
It would help to know what you are trying to achieve. Anyway, just for the mental exercise, you could convert the single phase to dc. I am assuming here that the voltage is ac in the first place. The dc could then be used to feed the field windings of a three-phase main alternator assembly. Of course, you will need a suitable prime mover to turn the field at the rpm necessary to generate at the voltage and frequency you require. This of course will be a very crude generator, as we have not even considered voltage regulation, here.
08-19-2013 09:47 PM
Top #11
Many option for your question, depending on what would be used for ?
all comment above are good answer, the point is must be use converter.
- Transformer 1 Phase to 3 Phase
- Inverter from 1 Phase to 3 Phase
But for installation motor 3 Phase with source 1 Phase, you can use capacitor for it.
08-19-2013 09:48 PM
Top #12
A phase converter is a device that converts electric power provided as single phase to multiple phase or vice-versa. The majority of phase converters are used to produce three phase electric power from a single-phase source, thus allowing the operation of three-phase equipment at a site that only has single-phase electrical service.
08-27-2013 09:21 PM
Top #13
You can use a phase converter. A single-phase motor can drive a three-phase generator, which will produce a high-quality three-phase source but with high cost for apparatus.

Electronic means of creating three phase where the incoming power is rectified, and the three phase power is synthesized with electronics. Power electronic devices directly produce a three-phase waveform from single-phase power, using a rectifier and inverter combination. This also offers the advantage of variable frequency.

A digital phase converter uses a rectifier and inverter to create a single voltage with power electronics, which is added to the two legs of the single-phase source to create three-phase power. Unlike a phase converting VFD, it cannot vary the frequency and motor speed since it generates only one leg which must match the voltage and frequency of the single-phase supply. It does have the advantage of a sine-wave output voltage and excellent voltage balance between the phases.

Rotary phase converters constructed from a three-phase electric motor or generator "idler". These normally require some kind of starting aid and capacitors to improve phase balance and power factor. This is a two motor solution. One motor is not connected to a load and produces the three phase power, the second motor driving the load runs on the power produced.

Static conversion techniques in which the motor is run at less than full efficiency mainly on two of the legs of the three phase motor. Current is sometimes injected into the third leg with a capacitor or transformer arrangements that provide imperfect phase shift. In these systems the motor must be derated.