Precise Control.
Proven Drives.
Variable frequency drives and soft starters built on twenty years of digital power-conversion engineering — for tight speed control, smooth starts, and motor protection on any three-phase load.
Drives Built On A Harder Problem
Phase Technologies tackled the hardest three-phase power problem there is more than twenty years ago, with the introduction of our Phase Perfect® line of modern, digital phase converters.
Overcoming the engineering challenges of creating perfectly synchronized three-phase power from a single-phase source using modern digital switching technology wasn’t easy. You have to account and constantly adjust for phase timing, voltage balance, and a host of other variables to deliver utility-quality three-phase power.
Having overcome those challenges, building three-phase and single-phase variable frequency drives (VFDs) using some of the same technology inside has resulted in an extremely robust product.
What Makes Phase Right
For Motor Control
Variable Speed
Precise speed and torque control across the full range — match the motor to the process instead of running flat-out and throttling the result.
Soft Start & Stop
Ramp motors up and down smoothly — no inrush spike on the line, no mechanical shock to belts, gears and couplings. Longer equipment life from day one.
Motor Protection
Built-in protection against overload, phase loss, over/under-voltage and stall — the drive watches the motor and shuts down before damage is done.
Energy Savings
On variable-torque loads, a motor at 80% speed draws roughly half the power. Variable speed turns wasted throttling into measurable energy savings.
Phase-Converting VFDs
Only have single-phase service? Phase-converting drives run three-phase motors from a single-phase supply — the same digital heritage as Phase Perfect®, built in.
Low Harmonics
LH Series active front-end drives meet IEEE 519 natively — no external filters — and regenerate braking energy back to the grid on high-cycle loads.
Phase Connect
Cellular monitoring for any Phase drive. Check run status, adjust setpoints, and receive fault alerts from anywhere — no site visit required.
Panel Shop Ready
Need a complete listed panel? Our UL 508A shop builds motor-control assemblies — VFD, bypass, HOA, combination starters and protection — shipped wired and tested.
Variable Frequency Drives
Phase Perfect® heritage, in a drive.
Our VFDs are built with some of the same digital switching technology that makes Phase Perfect® the gold standard in phase conversion — constantly managing phase timing and voltage balance. The result is an extremely robust drive that delivers precise variable-speed control, soft starting, and motor protection on any three-phase load.
Products For
Motor Control
From a compact standalone VFD to a low-harmonic regenerative drive or a complete panel shop build, Phase has a motor-control solution sized for your load.
LHX Series
Active front-end VFD for large, high-cycle and regenerative loads. Returns braking energy to the grid, meets IEEE 519 natively, and handles voltage imbalance with ease.
DXL Series
General-purpose three-phase VFD for fans, pumps, conveyors, compressors and machine tools. Rugged construction, wide HP range, and simple setup for everyday motor control.
Residential Drives
A drive and digital phase converter in one — run a three-phase motor with variable-speed control from a single-phase supply, with no separate rotary converter needed.
Phase Connect
Cellular-connected remote monitoring for any Phase drive. View run status, adjust setpoints, and receive fault alerts from anywhere — no Wi-Fi, no site visit required.
Motor Starters
Soft starters and motor starters for loads that don’t need variable speed — reduce inrush, protect windings, and extend motor life without a full VFD.
Filters & Reactors
Drive output filters and line reactors protect motors from VFD-induced voltage spikes and reduce harmonic distortion on shared electrical services.
Built To Spec,
Built In‑House.
Need more than a drive? Our UL 508A panel shop builds complete, listed dewatering control assemblies, including VFD, bypass, HOA, motor protection, and wiring, engineered for your pump HP, input voltage, and NEMA rating.
Built In The USA
Proudly American Made
Every Phase drive is engineered, assembled and tested at our Rapid City, South Dakota headquarters — with the industry’s fastest lead times.
BABA Compliant · Build America, Buy America