Phase Technologies LLC

Phase Technologies LLC Global Headquarters:
222 Disk Drive
Rapid City, SD 57701 This was the first major advancement of phase conversion technology in decades.

Who We Are

Phase Technologies is a power electronics manufacturer located in Rapid City, South Dakota. Founded in 1999, Phase Technologies developed the world’s first digital phase converter, called the Phase Perfect® Digital Phase Converter. Recognized as the world’s leading manufacturer of phase converter technologies, the company expanded the technology into variable frequency drives (VFDs) in

the irrigation, water pumping, HVAC and oil & gas industries. Specializing in VFDs with Active Front End technology, Phase Technologies produces the only low harmonic, fully regenerative, phase-converting VFD that complies with IEEE 519, the international standard for allowable harmonic levels on utility mains. The company has an extensive product line-up of low harmonic, fully regenerative drives in both three-phase and phase-converting models. Our Story

Phase Technologies relies on a team of in-house power electronics and mechanical design engineers to develop innovative products, encompassing all aspects of hardware and firmware design. All products are manufactured at our facilities in the USA under exacting quality standards. In-house processes include printed circuit board population, wire assemblies, and our own proprietary magnetics fabrication. The company operates a certified UL 508A panel shop to integrate our drives into rugged outdoor panels with custom options for applications including irrigation, oil and gas production, and general industrial control. The custom integrations are part of the manufacturing process, not an afterthought. Integrity and honesty are the cornerstones of customer interaction at Phase Technologies. Knowledgeable sales experts are available to help customers select the right product to fit their needs, and we partner with the best distributors and dealers to make our products available with industry best lead times and local service. Typical manufacturing lead time is 3-7 business days. Experts in our customer service department are standing by to answer any technical questions and provide the support to keep your application up and running.

Join Rory Penfold for a practical, contractor-focused session on Variable Frequency Drives (VFDs)—covering how they work...
05/28/2026

Join Rory Penfold for a practical, contractor-focused session on Variable Frequency Drives (VFDs)—covering how they work, pump system performance, motor protection, harmonics, troubleshooting, and installation best practices to ensure reliable real-world performance.

05/21/2026

Were headed to the Sunshine State!

Next week May 28-30th we will be attending the Florida Ground Water Association

Stop by and see us!

05/20/2026

⚡️Alpha Drive Unboxing ⚡️

Unlike traditional systems that experience pressure fluctuations and reduced flow as demand increases, Alpha Drive continuously adjusts speed and flow to deliver steady, reliable water pressure when it matters most.

Engineered for performance. Built for reliability.

https://youtu.be/ySojLB750cQTake an inside look at the people, technology, and innovation driving Phase Technologies.⚡🦅🇺...
05/18/2026

https://youtu.be/ySojLB750cQ
Take an inside look at the people, technology, and innovation driving Phase Technologies.⚡🦅🇺🇸 💥

Take an inside look at the people, technology, and innovation driving Phase Technologies. ⚡From engineering and manufacturing to testing and assembly, this b...

We received an incredible testimonial from one of our customers! Here is what he had to say:One of my favorite machines ...
05/13/2026

We received an incredible testimonial from one of our customers! Here is what he had to say:

One of my favorite machines is my 1965 Burke Millrite milling machine with a 1 HP Reuland 3-phase motor. I bought this machine 20 years ago with a small, off-brand phase convertor, but the motor never ran very strong. I decided to upgrade, but the options are very limited, with rotary convertors being the most prevalent. What pain that looked like. Bulky, expensive, and out of the question for a space-limited shop.

Then I found Phase Technologies, even though they
manufacture large industrial systems, they are putting the same quality into and addressing a huge need in easy, cost-effective phase conversion for even a home shop. With the Phase Perfect Residential Pro. This system is a simple answer to a common problem. It's easy to understand and install; voltage outputs are exactly within the advertised specs, and my prized 61-year-old machine runs better than I've ever known.

I've worked with, designed, and built electronics of many types throughout my long career. I am a perfectionist and recognized quality when I see it. Their products are built here in the USA by people that obviously have a deep sense of pride in the products they manufacture.

I highly recommend that anyone in a similar situation to look at this amazing product line. You'll be equally impressed.

Paul,
New Mexico

05/06/2026
Shoutout to Dwyer Water Wells and their incredible work with this poultry farm. The setup is powered by our Alpha Drives...
04/10/2026

Shoutout to Dwyer Water Wells and their incredible work with this poultry farm. The setup is powered by our Alpha Drives (pictured), and we truly appreciate them for trusting our technology to keep everything running efficiently and reliably.

Thank you for choosing us to be part of your operation. We’re excited to see the continued progress with this project! 🙌

https://www.phasetechnologies.com/products/vfd/ad

Address

222 Disk Drive
Rapid City, SD
57701

Opening Hours

Monday 8am - 5pm
Tuesday 8am - 5pm
Wednesday 8am - 5pm
Thursday 8am - 5pm
Friday 8am - 5pm

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