AYK550-UH-038A-4+K465 VFD (also referenced as AYK550‑UH‑038A‑4+K465) is a variable frequency drive (VFD) used to control the speed and torque of AC electric motors, often in HVAC (Heating, Ventilation, and Air Conditioning) and industrial motor applications. It is designed to optimize motor performance, improve energy efficiency, and provide smooth speed control.