SPIDER Automation | 36V 350W Geared Front Hub Motor | Brushless DC Motor with Planetary Gears for Electric Bicycles
The SPIDER Automation 36V 350W Geared Front Hub Motor is a brushless DC motor designed for front-wheel electric bicycle conversion and replacement applications. It incorporates an internal planetary gear mechanism that reduces motor speed through mechanical gearing and supports higher torque at the wheel. This geared hub configuration is suitable for electric bicycle drive systems requiring a compact motor integrated into the front wheel assembly.
The motor is rated at 36V and 350W and is designed for spoke-wheel configurations using compatible 20–28 inch wheels. It has 36 spoke holes, a listed rated speed of 328RPM and a rated torque of 61kg-cm. Its electrical specifications also include a rated current of 14A and a no-load current of 1,000mA. The motor is available in black or grey, with the supplied colour depending on availability.
Product Overview & Geared Hub Motor Design
A geared hub motor integrates the electric motor and a mechanical reduction mechanism within the wheel hub. In this design, internal planetary gears reduce the motor’s rotational speed and transmit the resulting torque to the wheel. This arrangement supports applications where wheel-side torque and compact motor integration are important.
This model is designed as a front-wheel brushless hub motor for electric bicycle systems. Its spoke-hole arrangement allows it to be incorporated into a compatible spoked wheel build. Correct installation requires matching the motor’s axle and mounting interface, wheel geometry, spoke requirements and electrical connections with the intended bicycle.
Technical Features & Functional Characteristics
- Brushless DC Motor Technology: Designed for operation with a compatible brushless motor controller.
- 350W Rated Power: Specified for a 350W electric bicycle drive application.
- 36V Electrical System: Intended for compatible 36V battery and controller configurations.
- Planetary Gear Reduction: Internal gearing reduces motor rotational speed and increases torque available at the wheel compared with the motor’s higher-speed input.
- Front-Wheel Installation: Designed for integration into a compatible front spoked-wheel assembly.
- 36-Hole Spoke Interface: Provides 36 spoke holes for compatible wheel-building arrangements.
- 20–28 Inch Wheel Range: Listed for use with compatible bicycle wheel sizes from 20 to 28 inches.
- Rated Torque: The listed torque is 61kg-cm, equivalent to approximately 5.98N·m.
- Rated Rotational Speed: The listed motor speed is 328RPM.
- Hall Sensor Connection: The motor description identifies Hall sensor wiring for compatible controller feedback and commutation support.
- Temperature Sensor Connection: Temperature-sensing wiring is identified for integration with compatible monitoring or controller circuitry.
- Black or Grey Colour: Available in two finishes, supplied according to stock availability.
Internal Planetary Gear Mechanism & Torque Characteristics
The motor incorporates an internal planetary gear reduction system. Planetary gearing uses a central sun gear, surrounding planet gears and a ring gear arrangement to provide speed reduction within a compact assembly. This mechanical reduction enables the motor to deliver increased torque at the wheel relative to its higher-speed motor rotation.
The listed rated torque is 61kg-cm, approximately 5.98N·m. Actual wheel performance depends on the complete gear arrangement, controller settings, battery capability, wheel size, vehicle load and operating conditions. The motor’s torque specification should therefore be considered alongside the other drive-system requirements rather than treated as a guaranteed vehicle acceleration or climbing figure.
Front Wheel & Spoke Compatibility
This motor is designed for a front-wheel spoke assembly and has 36 spoke holes. It is listed as compatible with 20–28 inch bicycle wheel sizes, allowing it to be considered for different wheel diameters within that range when the rim and spoke arrangement are suitable.
Wheel size alone does not establish complete mechanical compatibility. The rim’s spoke-hole pattern, spoke length and gauge, hub flange geometry, axle dimensions, fork spacing and available mounting clearance must match the motor and bicycle. The motor should be built into a properly tensioned wheel by a person familiar with hub motor wheel assembly.
Electrical Ratings & Motor Controller Integration
The motor is specified for a 36V electrical system, with a rated power of 350W and a rated current of 14A. It is a brushless DC motor and therefore requires a compatible brushless motor controller. The controller must match the motor’s electrical characteristics and supported sensor arrangement.
The product description identifies Hall sensor and temperature-sensing connections. These should be matched to the corresponding controller inputs where supported. Wire colours, connector types, pin assignments and temperature-sensor characteristics are not established by the supplied specifications, so the actual wiring diagram must be used for installation.
Applications
This geared front hub motor is intended for electric bicycle conversions and other compatible front-wheel drive projects designed around its voltage, power, mechanical mounting and wheel requirements.
- Electric Bicycle Conversion: Front-wheel motor integration in compatible conventional bicycles being converted to electric drive.
- Electric Bicycle Replacement: Replacement of an existing front hub motor when the voltage, mounting and wheel specifications match.
- 20-Inch E-Bikes: Suitable for compatible compact electric bicycle wheel builds using a matching 20-inch rim and spoke arrangement.
- 26-Inch E-Bikes: Front hub motor integration in compatible 26-inch electric bicycle wheel assemblies.
- 28-Inch E-Bikes: Use in compatible larger-wheel electric bicycle builds with matching mechanical dimensions.
- Urban Electric Bicycles: Geared front-wheel drive applications in suitable electric bicycles designed for urban travel.
- Electric Commuter Bicycles: Motor integration in compatible commuter bicycle platforms with matching battery and controller systems.
- Custom E-Bike Builds: Use in custom electric bicycle projects designed around a 36V geared brushless hub motor.
- Electric Bicycle Repair: Replacement of a compatible geared front hub motor during drive-system maintenance.
- Spoked Wheel Motor Projects: Wheel-building applications requiring a 36-hole front hub motor interface.
Package Includes
- 1 × 350W 36V Brushless Geared Front Hub Motor for Electric Bicycle
Product Specifications
| Parameter | Specification |
|---|---|
| Product Type | Geared Front Hub Motor |
| Motor Type | Brushless DC Motor (BLDC) |
| Motor Position | Front Wheel |
| Gear Mechanism | Internal Planetary Gears |
| Rated Voltage | 36V DC |
| Operating Power | 350W |
| Rated Current | 14A |
| No-Load Current | 1,000mA (1A) |
| Rated Speed | 328RPM |
| Rated Torque | 61kg-cm (approximately 5.98N·m) |
| Compatible Wheel Size | 20–28 inches |
| Spoke Holes | 36 |
| Hall Sensor Connection | Identified in product description |
| Temperature Sensor Connection | Identified in product description |
| Colour Options | Black or Grey (supplied according to availability) |
| Package Quantity | 1 Front Hub Motor |
Installation & Operating Recommendations
Before installation, verify the front fork mounting arrangement, wheel geometry and electrical compatibility of the motor. Since this is a geared brushless hub motor, it must be paired with a suitable 36V brushless controller that supports the motor’s Hall sensor arrangement where required.
- Check Front Fork Compatibility: Confirm axle dimensions, fork spacing, mounting interface and available clearance before fitting the motor.
- Match the Wheel and Spokes: Use a compatible 20–28 inch rim with a 36-hole pattern and spokes suited to the motor flange geometry.
- Select a Compatible Controller: Use a 36V brushless motor controller suitable for the motor’s 350W rating and electrical requirements.
- Match the Battery: Confirm that the battery’s nominal and fully charged voltages are suitable for the motor-controller system.
- Identify Sensor Connections: Match Hall sensor and temperature-sensing wires using the motor and controller wiring documentation. Do not infer pin assignments from wire colours.
- Build the Wheel Correctly: Ensure suitable spoke selection, even spoke tension and correct wheel alignment during assembly.
- Secure the Front Axle: Use the appropriate axle-retention hardware and a mounting arrangement suitable for the motor’s drive torque.
- Check Wheel Rotation: Confirm tyre clearance, wheel alignment, brake clearance and free rotation before powering the system.
- Test Under Controlled Conditions: Verify motor direction, controller response and sensor operation at low speed before normal riding.
