Data centers are rewriting the rules for motor drives — and harmonics are at the center
For years, harmonic distortion was treated as a cost of doing business — something you managed with an external filter cabinet bolted on after the fact. A new analysis from Interact Analysis suggests that assumption is quietly expiring, and data centers are the reason.
The demand signal
According to Interact Analysis (Rising demand for low-harmonic motor drives from data centers boom, June 2026), low-voltage AC drive revenues sold into the data-center sector exceeded $200 million in 2025, up 12.5% year over year, with the firm projecting 8.3% annual growth through 2030 — before counting indirect sales through HVAC OEMs whose equipment ends up inside data centers.
What’s notable isn’t just the growth; it’s how early we are. Interact Analysis estimates the global penetration of low-harmonic drives at roughly 5.6% in 2025, rising to about 7.5% by 2030. The Americas lead the world at ~11% — driven, the report notes, partly by aging grid infrastructure that is more sensitive to harmonic pollution. For anyone building in North America, that combination — low penetration, high sensitivity, rising standards — is the definition of an inflection point.
Why the shift is happening
The report attributes the move to two reinforcing pressures. First, power quality: data centers are dense with nonlinear loads — switch-mode power supplies and drives — that inject harmonic currents, producing voltage distortion, equipment overheating and additional losses. Where continuity of supply is the entire value proposition, those effects aren’t a nuisance; they’re a risk to the mission. Tightening standards, IEEE 519 chief among them, are turning harmonic mitigation from an option into a design prerequisite.
Second, total cost of ownership. Low-harmonic drives carry a higher upfront price, but they reduce system losses and cut the redundant design that harmonic problems force elsewhere in the electrical system. Over the life of a facility, the report argues, that math increasingly favors doing it right at the source.
Crucially, this isn’t only a data-center story. Interact Analysis is explicit that low-harmonic drives are already established wherever power quality is non-negotiable — water treatment and hospitals among them. Data centers are simply the fastest-moving edge of a broader shift.
The strategic point everyone should read twice
The report’s most important observation is about where the competition is going: away from standalone hardware performance and toward system-level architecture and “grid friendliness.” As it puts it, the marginal advantage of raw hardware specs is diminishing, while the ability to design a clean, coordinated system is rising. Vendors that understand the application — not just the component — will win the segments that matter.
Where SmartD fits
This is the thesis SmartD was built on. Conventional drives use IGBT switching that produces sharp PWM pulses, then rely on external filters to clean up the mess — on both the grid side (harmonics) and the motor side (voltage stress). The Clean Power VFD™ takes a different path. Built on SiC (Silicon Carbide) MOSFETs with a multilevel architecture and an Active Front End (AFE), it delivers a pure, filterless sine wave — addressing harmonics and motor stress at the source rather than downstream.
In practice that means input harmonics below 5% THDi against the IEEE 519 reference, with power factor near unity and regenerative braking — and it does this without external filter cabinets, in up to half the footprint of a filtered system. At the City of Stratford, a Clean Power VFD held total harmonic distortion below 3% on a 1,400-foot cable run with no filters added — the kind of result the report describes when it notes that some ultra-low-harmonic systems reach 3% THDi or lower under the right conditions.
There’s a second benefit the harmonics-only framing tends to miss. Because the output is a true sine wave, the same drive that keeps the grid clean also protects the motor — less insulation and bearing stress, contributing to longer asset life. In a data center, that motor is running a chiller, a CRAH fan or a cooling pump on a duty cycle that never really stops. Removing failure points — starting with the external filter, which is one more thing to size, house, wire and maintain — is exactly the “system-level” advantage Interact Analysis says the market is starting to reward.
The takeaway for specifiers
Interact Analysis is careful to note that low-harmonic drives are a scenario-driven capability, not a universal default, and that cost remains a real barrier. Fair. But if you’re designing a data center — new build or retrofit — in a region where the grid is sensitive and IEEE 519 is in the spec, the question is shifting from “which filter do we add?” to “what if the drive didn’t need one?”
That’s a design conversation worth having early. It’s usually cheaper to remove a cabinet on paper than to install one in the field.
Read the Interact Analysis report →
Sources: Interact Analysis, “Rising demand for low-harmonic motor drives from data centers boom,” June 2026. SmartD case data: City of Stratford deployment. Clean Power VFD™ is a trademark of SmartD Technologies. IEEE 519 compliance is evaluated at the point of common coupling / project level.
This post is also available in:
