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Many welding and fabrication shops operate with single-phase electrical service, while equipment such as welders, plasma cutters, and other metalworking machines often require three-phase power to perform at full capacity.
A rotary phase converter(link) provides a practical solution by generating balanced three-phase power from existing single-phase electricity. This allows welding and fabrication equipment to operate reliably without the cost of installing utility three-phase service.
American Rotary’s AD Digital Smart Series(link) is a high-performance digital rotary phase converter designed to power welding and metalworking equipment. The AD series uses a solid-state microsmart controller to maintain balanced power for voltage-sensitive machines and mixed-load fabrication environments.
Explore American Rotary phase converters for welders designed to generate reliable three-phase power from single-phase electrical service for fabrication shops, welding operations, and metalworking equipment.
Explore real installations, customer stories, and step-by-step guides from the largest phase converter video library on YouTube.
Watch how American Rotary power runs CNC machines, welders, farm equipment, woodworking tools, and more — all with clean, steady, reliable power built in the USA.
Our Advantages
In-stock equipment ships quickly so you can keep your operation running without delays.
American Rotary equipment is designed for real-world shop environments, with reliable components and proven performance.
From common applications to specialized setups, we stock a range of solutions ready to ship. If you don’t see what you need, we can help source it.
Choosing the right equipment matters. Our team helps you select the correct solution based on your application and requirements.
My old rotary phase converter gave 30 years of faithful service before it went up in smoke. With customers asking when I’d be operational, I researched every manufacturer and the choice was clear on American Rotary. First impression when it ... READ MORE
FAA Certified Machine Shop Owner
Very good company to do business with. The salesman Lenny treated me like I was a big company. I was shopping for a roto phase for my home machine shop. He had all the time in the world for me. ... READ MORE
Rodney Mears
A quick google search pointed me toward American Rotary. It wasn’t their website or their pricing but the number of videos and testimonials about the quality of their product and the great service. I wasn’t disappointed. I called on a ... READ MORE
Carl DiPaolo
I purchased this unit for a tenant in a commercial property that needed 3 phase power and the cost for the utility company to bring it in was significantly higher with much longer times to complete the project. The phase ... READ MORE
Matt Peace
I tried an inexpensive digital converter that made my machine motors very hot due to unbalanced power. A person I bought a milling machine from said he had an American Rotary and was very happy with the quality, so I ... READ MORE
Brad Everett
When I started, the garage had a single 120 V receptacle behind a shelf. Now, there (4) duplex 120A receptacles, (1) NEMA 16,20 A 240/120V with a DPDT switch to select voltages. 30A 50A 1 phase receptacles. Two 20A, one ... READ MORE
Raymond Jensen
I called in a talked to a representative told them I have a refrigeration unit I was looking to run 3 phase to, gave them the specs and was recommended the ADX 10. I ordered it super fast shipping got ... READ MORE
Jonathan Arrington
I had to move my workshop due to rent increases. The one I found didn’t have 3 phase. I found some cheap crappy digital shifter…didn’t work. Then I found American Rotary, they are the real deal! I am able to ... READ MORE
Mike Chinn
para todos los hispanohablantes America Rotary 100% recomendado fácil de instalar fácil de manejar fácil de cablear todo perfectamente gracias por su ayuda para poner en funcionamiento mi máquina edgebanding 3 Phase For all Spanish speakers, American Rotary 100% recommended. ... READ MORE
Neftaly Bustos Custom
Just got my ADX 5 up and running couldn’t be happier with my decision to purchase this excellent customer service and tech support. A++++++
... READ MOREMark Anderson
Absolutely love what american rotary does. Had a wonderful experience with their support team the phase converter we purchased and the transformer were supper easy to install definitely recommend buying from them. Customer service is 10/10
... READ MORECustom Machined Concepts | Andrey Girenko
American Rotary is an awesome company to work with, Mike was/is very helpful in answering my questions and getting me what I needed to get my shop ready for a new machine, giving me an option to either piggy back ... READ MORE
Charles Nelson
A phase converter for welders allows fabrication shops to operate three-phase welding equipment using standard single-phase electrical service.
By converting single-phase electricity into balanced three-phase power, a phase converter allows machines such as MIG welders, TIG welders, grinders, CNC mills, and other fabrication equipment to operate normally without installing utility three-phase power.
For many metalworking shops, using a phase converter is significantly more affordable than upgrading electrical infrastructure to bring in utility three-phase service.
Yes. A phase converter can run most welding equipment, including MIG welders, TIG welders, and stick welders.
Rotary phase converters generate balanced three-phase power, allowing welding equipment to start and operate at full capacity. Because of this, rotary phase converters are typically preferred for fabrication shops and metalworking applications.
Choosing the correct phase converter depends on the size of your electrical service, the type of equipment in your shop, and the total load you plan to run.
Many applications follow a common sizing guideline where the phase converter capacity is roughly twice the horsepower of the largest motor load.
It is also important to consider the types of equipment being powered, since fabrication shops often operate multiple machines such as welders, grinders, and CNC machines.
Learn more: How to Choose a Three Phase Converter for Welders →
Rotary phase converters are commonly used to power a wide range of fabrication and metalworking equipment.
Typical machines include:
Because rotary phase converters generate balanced three-phase power, they can often run multiple machines as long as the total electrical load remains within the converter’s rated capacity.
