A single FFU draws only ~150W, but a cleanroom with hundreds of units running 24/7 consumes tens of kilowatts. If every unit generates harmonics and low power factor, the whole plant power quality degrades: transformer heating, line losses, and interference with precision equipment.
The RSP5021 motor driver uses FOC vector control for smooth, low-ripple torque and efficient full-speed operation.
On the power stage, active PFC shapes input current to follow voltage: power factor rises from ~0.6 (no PFC) to a measured 0.989, while THD drops to ~10% at 30W and as low as 6% at rated 100W — meeting and exceeding commercial equipment harmonic limits.
These figures come from lab measurements, with third-party harmonic testing started in May 2026. Per the product upgrade plan, every hardware revision or material change triggers re-testing.
For cleanroom owners: high power factor means lower distribution capacity and electricity bills; low harmonics protects the plant grid — the core value of the FFU group control system.