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Three-phase motors will run on single-phase power. What they WON'T do is start. There is no easy way to re-wire such a large motor to run on a single phase.

Properly sized capacitors and a special relay is sometimes used on sewage lift stations (poopie stations is what we call them) to run the 3-phase pumps on single phase.

I've seen 10 hp motors used. Sometimes a lift station is needed where 3-phase power is not available The motor will not develop it's full horsepower, only about 2 thirds. A push-button can be used in place of the relay, but you will have to push the button until the motor starts then let go. If the motor stops you will need to push the button again. Usually expect several hundred micro-farads to be needed.

I have used old A/C motor-run capacitors in parallel to experimentally determine the actual size (capacitance) needed. Be sure to use correct working voltage capacitors. DANGER!!! Electricity can EASILY kill you and capacitors can blow up in your face!!!

I've seen crazy people attempt to rope-start three-phase motors (it works), connect phase converters, all sorts of weird stuff. In reality, single-phase 5hp motors are available, so the a good recommendation is to trade-in the 3-phase motor for a 1-phase motor of the size you need.


To run a three phase equipment from a single phase source, you will need something called a "phase converter".

Before you go out and buy one, find out if a single phase motor is available to match your requirements. It will probably be an easier solution for you if you can do that.


Depending on your application, another option with such a large motor is to get a "Variable Frequency Drive". These are somewhat expensive but will take in a single-phase input and output 3-phase.


As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.




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โˆ™ 2010-08-22 10:19:23
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Q: How do you convert or rewire a 5hp 3 phase motor to a single phase motor?
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How do you convert or rewire a 20HP 3 phase motor to single phase motor?

The winding design of the motor will not economically allow this to work. You would have to drive a 3 phase generator to supply it.

How do you convert or rewire a 3 phase motor to a single phase?

Many electric motors have a single phase connection available. If not, there are a few choices but I would suggest hiring an electrician to do the work.

How do you convert or rewire a 5HP 3 phase motor to two phase motor diagram?

I assume that by two-phase, you really are talking about a supply with two hot wires and a neutral, such as 120/240 volt. This is single phase power, it just has power taps on both ends of the transformer winding, the neutral is the center tap. I don't think it is possible to convert or rewire your motor. A large 3 phase motor must be run on a 3 phase electrical supply. It will not run and will overheat if you try to connect it to a single phase supply. The only way to make a 3 phase supply from a single phase supply is to use a converter like a motor-generator set. That would be way more expensive than getting a new motor.

Can you rewire a half hp 3 phase motor for 220 single phase?

As far as I know you cannot . You can however get a phase converter which takes 220 volt single phase input and converts it to 3 phase output.

How do you rewire a 3 phase 2 speed 480 volt motor to operate on 220 volt single phase power?

you dont you have to buy a step down transformer or a new motor

110 220 motor that is a single phase how to rewire it to 120V from 220V?

If it is a six wire motor go to

How do you convert a 0.37kw 4 pole 3 phase motor to single phase?

The motor cannot be altered to work on single phase power. You will either have to put in a new single phase motor or use a phase convertor box. Do a google search for phase convertor - you will find plenty.

Can you change 3 phase compressor to single phase compressor?

If you are referring to an air compressor motor then yes. A single phase and three phase motor can be interchanged. They have to have the same horsepower though because the compressor manufacturer has calculated the needed HP to turn the compressor over. You may need to rewire for the single phase motor unless the single phase voltage is the same as what the three phase voltage was. If this is the case just use two legs of the three phase voltage supply. The overload protection will have to be changed to reflect the higher current used by the single phase motor.

Can I convert Single phase to three phase for resistance heating?

Single phase can't be turned into 3-phase by any reasonable means. But on the other hand resistance heating is fairly straight forward. If only the fuse rating is high enough it might be possible to rewire a 3-phase heater to run from a single-phase source.

How do you convert or rewire a 5hp 3-phase motor to a single-phase motor?

To run any three phase equipment from a single phase source you will need something called a "phase converter" that can handle the full power of the motor. Phase convertors are very expensive so, before you go out and buy one, find out if a single phase motor is available to match your requirements. It will probably be an easier and cheaper solution for you if you can do that. If you already have a three phase motor that is in good condition, you may be able to find a local dealer who would part-exchange it - or even swap it - it for a good quality used single phase motor with a warranty. It is simply not worth destroying a perfectly good three phase motor! Converting or rewiring a three phase motor to run on single phase is not a simple job to do, nor is it worth doing, because the work required would cost a lot to do. It is simply not a practical proposition. That fact is true even for a professional electrical engineer who has all the right equipment to be able to do it.

Can you convert single phase electric motor to three phase connection?

It is impractical to do a conversion from single phase to 3-phase unless the motor already has the necessary windings and connections built into it. Consult the motor's rating plate and installation guide or handbook.It may also be worth asking a motor dealer, or, if it is a large industrial motor, the manufacturer, to see if they will exchange your single-phase motor for a used 3-phase one that is in good condition.

Can you convert three phase electric motor to single phase motor?

Not without having all the coils re-wound which would probably cost more than buying a single-phase motor to do the job. You can alternatively use a phase converter, that converts single phase to three, to run your motor. You can make these (plans on the internet), or purchase a converter (more expensive), but easier than re-winding the motor which is impractical).

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