Sensorless threephase brushless DC motor controller with Hall operation that can run directly from power; no external signals required. Designed for speed regulation of threephase brushless motor driven equipment such as air pumps, water pumps, oil pumps, fans and other industrial control tools. Stepless speed control via potentiometer with a singlebutton interface to achieve smooth acceleration and deceleration. Wide input voltage range 626V DC; compact power controller with a small footprint. Key benefits and features Direct poweron operation: works without needing external control signals, simplifying installation and startup. Sensorless control: Hall design suitable for a variety of threephase BLDC motor applications. Simple speed adjustment: potentiometerbased continuous speed control plus a singlebutton control for easy ramping. Broad compatibility: intended for air pumps, water pumps, oil pumps, fans and similar industrial equipment using threephase brushless motors. Small form factor with power: compact size yet capable of handling typical BLDC motor demands within the 626V range. 23 practical use scenarios Industrial air pump: regulate airflow in ventilation or aeration systems by adjusting speed to meet demand without external signal wiring. Pump system control: manage liquid flow in water or oil pump lines by varying speed to match process requirements. Small cooling or ventilation fan: control enclosure cooling or machine cabinet ventilation with simple, reliable handoff from power on to desired speed. Compatibility and performance highlights Threephase brushless motor compatibility with sensorless (Hall) control for straightforward integration. Wide voltage operation from 6V to 26V DC supports a range of compact BLDC motors. Compact, power design preserves space in tight installations while delivering reliable performance.