24V/36V 250W Three-Phase BLDC Motor Controller with PAS & Hall Sensors

This 24V/36V 250W three-phase BLDC motor controller is an electronic control unit for brushless DC motors. It drives e-bike, e-scooter and light electric vehicle motors rated up to 250 W. The board converts battery DC voltage into a three-phase motor supply sequence. Therefore it works with any 3-phase brushless motor within that power class.

Compatibility covers 24 V and 36 V lithium-ion, LiFePO₄ and sealed lead-acid (SLA) battery systems. Maximum phase current is 13 A, and the board measures just 95 × 50 × 3 mm. The controller runs both with Hall sensors (3×) and in sensorless mode. Self-learning detects motor phases and rotation direction automatically.

Control inputs include a PAS pedal assist input, a 0-5 V throttle input, three speed-switch wires and a brake cut-off input. As a result, it suits a complete pedal-assist e-bike build as well as a simple throttle-only motor setup. This is a replacement part: motor, battery, throttle and display are not included.

Key Benefits

• Self-learning setup – the controller identifies motor phases and rotation direction automatically, so no wire-swapping trial and error is needed.
• Sensored and sensorless operation – the three Hall sensor inputs are optional, and sensorless mode starts through the self-learning routine.
• Three speed modes – Low, Mid and High are selected with an external switch through the three speed wires.
• PAS pedal assist input – sensitivity adjusts according to the cadence sensor disc fitted to the bike.
• Soft-start function – smooth take-off reduces shock loads on the drivetrain and chain during starts.
• Four built-in protections – low voltage, overcurrent, short circuit and overheating are all monitored.
• Dual voltage coverage – one controller serves both 24 V and 36 V systems, so stock is simpler for repair work.
• Compact 95 × 50 × 3 mm board – it fits narrow frame cavities and small battery box compartments.

Who Is This Controller For?

This unit is designed for electric bicycles with a PAS system, electric scooters, mobility scooters and small DIY electric builds. Above all, it fits applications where the motor is a three-phase BLDC type rated at no more than 250 W. Battery compatibility spans 24 V and 36 V lithium-ion packs, LiFePO₄ packs and SLA batteries.

Throttle choice is wide. The 0-5 V input accepts a thumb throttle, a half twist grip or a full twist grip. In addition, the controller can drive motors that have no Hall sensors at all, because sensorless mode is available. That flexibility helps when the original sensor wiring is damaged or missing.

Consequently, the board suits e-bike repair technicians and DIY project builders alike. It also serves as a direct replacement when an original 250 W controller has failed. Installation is intended for indoor or moisture-protected locations.

Technical Specifications

Installation Recommendations

Observe correct polarity (+/-) and correct phase order before powering up. Connect the self-learning wires only during setup, then disconnect them once the procedure finishes. Use wire cross-sections rated for the working current of your system.

Furthermore, ensure adequate ventilation around the board. The PCB warms up under continuous load, so airflow matters in a sealed enclosure. A fuse sized to the system current is recommended in the battery circuit.

Why Choose This Controller

Most budget replacement boards lock you into one battery voltage. This one covers 24 V and 36 V packs, which reduces guesswork when the donor bike specification is unclear. The self-learning routine removes the usual phase-matching headache during a rebuild.

The four protection circuits guard against low voltage, overcurrent, short circuit and overheating. Meanwhile, soft-start keeps the initial torque surge in check, which is easier on chains and gears. Three switchable speed modes add rider control without any display unit.

Finally, the 3 mm thick board is genuinely slim. It slides into tight frame channels where thicker potted controllers simply do not fit.

Frequently Asked Questions

Will this controller work with a motor that has no Hall sensors?

• Yes. Sensorless mode is supported and activated through the self-learning routine.
• The three Hall sensor inputs remain optional rather than required.

Does it fit both 24 V and 36 V e-bike systems?

• Yes. One board covers 24 V and 36 V configurations.
• Lithium-ion, LiFePO₄ and SLA battery packs are all compatible.

Which throttles are compatible with this BLDC controller?

• Any throttle giving a 0-5 V signal works.
• Thumb throttles, half twist grips and full twist grips are all supported.

Can I use it on an e-scooter or mobility scooter?

• Yes, provided the motor is a three-phase BLDC type rated at 250 W or less.
• Small DIY electric builds are also within scope.

How do the three speed modes work?

• Low, Mid and High are selected by an external switch.
• The switch connects through the three dedicated speed wires.

Is a motor or battery included?

• No. This is a replacement part only.
• Motor, battery, throttle and display are supplied separately.

Can it be mounted outdoors on the frame?

• No IP rating applies to this board.
• Mount it inside a moisture-protected enclosure or frame cavity.

What does the self-learning function actually do?

• It detects the motor phase order and rotation direction automatically.
• Connect the learning wires during setup, then disconnect them afterwards.

With PAS input, brake cut-off, three speed modes and dual 24 V / 36 V support in a 95 × 50 × 3 mm package, this 250 W BLDC controller covers most light electric vehicle repairs and builds. Confirm your motor phase count and power rating before ordering.