Three-phase brushless sensorless motor controller for fan drives and other BLDC applications, providing smooth speed control, reliable bidirectional operation, and built-in overcurrent protection. Key benefits: - Precise speed control from 0 to 100 percent using a 270 degree linear potentiometer, making it easy to tune fan or motor speed for optimal airflow or power use. - Bidirectional operation for forward and reverse rotation, enabling reversible fans or motor applications without additional wiring. - Built-in current protection with a 15 amp limit to protect the motor and controller from overloads. - Compact footprint and barrier terminal connections for secure wiring and flexible installation in tight spaces. Main features and specifications: - Motor type supported: three-phase brushless DC sensorless motors. - Input voltage: DC 5 to 36 volts. Specific operating voltage should match the motor rated voltage. - Recommended operating guidance: use the controller within the motor rated voltage range, typically within 5 to 24 volts for common small BLDC motors. - Maximum output current: 15 amps. Overcurrent protection set at 15 amps. - Speed control method: 270 degree linear potentiometer type, 100K potentiometer with integrated switch. - Speed range: 0 to 100 percent. - Direction: supports forward and reverse rotation. - Connection: barrier terminal for power and motor phase wiring. - Size: 6 cm by 8 cm (2.36 by 3.15 inches). - Sensorless control, suitable for motors that do not require Hall sensors. Performance and compatibility notes: - The power supply must be capable of supplying higher current than the motor running current to ensure stable operation. - Ensure correct DC polarity when connecting the input supply. Do not connect AC mains or 220V household power to this controller. - Match the controller input voltage to the motor rated voltage for reliable performance and to avoid damage. Typical applications: - Fan and ventilation systems: precise speed control for axial or centrifugal BLDC fans in cabinets, enclosures, or ventilation ducts. - Hobby and small machinery projects: controlling three-phase brushless motors in pumps, blowers, or model equipment where reversible operation and adjustable speed are required. - Equipment cooling: adjustable-speed drives for server racks, industrial controllers, or custom cooling solutions where compact size and simple wiring are priorities. What makes this controller stand out: - Simple and intuitive speed adjustment with a linear 270 degree potentiometer and on/off switch built into the knob. - Compact design with secure barrier terminals for reliable long-term connections in DIY or retrofit installations. - Sensorless three-phase control suitable for a wide range of BLDC motors rated within the supported voltage and current limits. Installation tips: - Verify the motor rated voltage and ensure the controller input voltage matches that rating. - Use a DC power source with adequate current capacity above the motor working current. - Secure all wiring in the barrier terminals and observe correct phase and polarity connections. - Do not connect AC mains or 220V to the controller. This motor controller provides a compact, reliable solution for controlling three-phase brushless DC motors up to 15 amps, offering easy speed adjustment, bidirectional operation, and integrated protection for a range of fan and small motor applications.