Brushless motor RB-3640-68 series

BLDC12 V24 V

Product overview

Key facts for engineering buyers

• Product category: Brushless DC Motors (BLDC)
• Motor family: Outer rotor BLDC
• Brand / manufacturer: KWC Motor (Dongguan KWC Machinery Co., Ltd.)
• Typical applications: mixers, centrifuges, fans, pumps

Specification signals

• Diameter: 36 mm
• Body length: 40 mm
• Torque (series max): up to 269.9 g·cm

Target applications & solutions

• Medical & laboratory equipment: Designed for centrifuges, mixers and surgical power tools; outer-rotor high inertia supports speed stability at high rpm.
• Industrial fluid handling & air-moving: Suitable for high-power blowers/fans, micro pumps, water pumps and electric actuators; high power density for driving high-resistance loads.

Technical specifications (table)
Model | Operating Voltage Range | Nominal Voltage | No-Load Speed | Max Efficiency Speed | Max Efficiency Torque | Output (at Max Efficiency)
RB-3640-68-N-01 | 9.0V - 14.0V | 12.0V | 7,930 rpm | 6,405 rpm | 269.9 g·cm | 26.46 W
RB-3640-68-N-02 | 19.0V - 26.0V | 24.0V | 3,420 rpm | 2,920 rpm | 114.1 g·cm | 11.19 W
RB-3640-68-N-03 | 19.0V - 26.0V | 24.0V | 16,020 rpm | 13,416 rpm | 241.2 g·cm | 33.2 W
RB-3640-68-N-04 | 8.0V - 26.0V | 12.0V | 4,475 rpm | 3,840 rpm | 204.0 g·cm | 8.04 W

Comparison (summary)
Comparison Item | KWC RB-3640-68 (40 mm outer rotor) | Standard 36 mm motor
Torque smoothness | Excellent (high rotor inertia) | Standard
Torque output | Extremely high (max 269.9 g·cm) | Limited by body length
Power density | Very high (max 33.2 W) | Standard
Body length | 40 mm (high-power version) | Varies

Customization notes

• Shaft length and type (D-shaft / threaded), mounting hole pattern
• Performance parameters: voltage, speed, torque
• Pre-assembly options: gearboxes, encoders, lead wires, terminals
• Control board, EMC and noise countermeasures per customer requirements

Purchasing FAQ

• Minimum order quantity (MOQ): Flexible. Samples available (1–5 pcs). Pilot runs typically 100–500 pcs; mass production from ~1,000 pcs depending on spec.
• Packaging: Industrial blister trays + reinforced outer cartons; palletized export packing available.

Features / technical specifications

• Model family: RB-3640-68 series (outer-rotor BLDC)
• Rotor type: Outer rotor
• Diameter: 36 mm
• Body length: 40 mm
• Maximum torque (series): up to 269.9 g·cm
• Maximum no-load speed observed: up to 16,020 rpm
• Nominal voltages: 12.0 V and 24.0 V (varies by model)
• Operating voltage ranges: 8.0V–26.0V depending on model
• Maximum output (at max efficiency): up to 33.2 W
• Typical target applications: mixers, centrifuges, fans, pumps, medical/lab equipment, fluid handling and air-moving systems