Brushless motor RB-5740-68 series

BLDC12 V18 V

Product overview

RB-5740-68 is a 57 mm-class brushless DC motor (BLDC) from KWC Motor featuring a compact 38.9 mm body length and high rotor magnetic flux for elevated torque and power density. Typical top-rated torque reaches up to 700 g·cm (N-03 / N-04) with stall torque near 2.8–3 kg·cm, making the model suitable where compact high-torque or stable high-speed performance is required.

Key facts for engineering buyers

• Product category: Brushless DC Motors
• Motor family: BLDC
• Brand / manufacturer: KWC Motor, Dongguan KWC Machinery Co., Ltd.
• Typical applications: Robotics, smart lawnmowers, centrifuges, commercial food processors, AGV/service robots

Specification signals

• Diameter: 57 mm (NEMA 23-class)
• Body length: 38.9 mm (low-profile)
• Rated torque (max reported): up to 700 g·cm

Customization and sourcing notes
OEM/ODM customization is supported for operating voltage, speed, torque tuning, shaft design (length, D-shaft, threaded), mounting patterns, cable/connector options, gearbox integration, encoder/pre-assembly options and EMC/noise targets. Mechanical dimensions and electrical parameters can be adjusted per project. Pricing and lead time depend on confirmed variant, quantity and customization scope.

Target applications & solutions

• Service robotics & outdoor power: Drives for robot lawn mowers, commercial service robots and AGVs; compact 38.9 mm body facilitates integration into wheel hubs or chassis.
• Laboratory instruments & commercial food processing: Suitable for high-speed centrifuges and commercial food processors where stable low-speed torque and smooth high-speed operation are required.

Technical specifications
* Data source: KWC RB-5740-68 specification sheet. Voltage, speed and shaft length are customizable.

RB-5740-68-N-01 | Operating Voltage Range: 6.0V – 15.0V | Nominal Voltage: 12.0V | No-Load Speed: 2550 rpm | Speed @ Max Efficiency: 2370 rpm | Torque @ Max Efficiency: 131.3 g·cm | Output Power: 12.87 W
RB-5740-68-N-02 | 8.0V – 26.0V | 24.0V | 4980 rpm | 4524 rpm | 265.1 g·cm | 25.99 W
RB-5740-68-N-03 | 18.0V – 26.0V | 24.0V | 6000 rpm | 5250 rpm | 700.0 g·cm | 68.63 W
RB-5740-68-N-04 | 18.0V – 26.0V | 18.0V | 6000 rpm | 5250 rpm | 700.0 g·cm | 68.63 W

Comparison highlights (57 mm vs typical 42 mm)

• Torque capability: RB-5740-68: up to 700 g·cm vs typical 42 mm: typically < 400 g·cm
• Power output: up to ~68.6 W vs typical 42 mm: typically < 40 W
• Stall/burst torque: high burst torque (~2.8–3 kg·cm)
• Motor structure: wide-body 57 mm low-profile vs slimmer, longer form factor for smaller motors

Manufacturing, quality and order notes

• Factory-direct manufacturing with tooling workshop and automated assembly lines supports prototyping and volume production.
• Quality control: 100% inspection including noise and current tests; RoHS / REACH compliant.
• Sampling & lead times: sample delivery commonly 7–14 days; production capacity supports stable mass production.
• MOQ guidance: samples 1–5 pcs acceptable; pilot orders 100–500 pcs; recommended mass production from ~1,000 pcs.
• Packaging: industrial blister tray plus reinforced cartons; palletized export packing available.

Characteristics / technical summary

• Commercial designation: RB-5740-68
• Brand: KWC Motor (Dongguan KWC Machinery Co., Ltd.)
• Motor type: Brushless DC Motor (BLDC)
• Outer diameter: 57 mm (NEMA 23-class)
• Body length: 38.9 mm (compact low-profile)
• Rated torque (max reported): up to 700 g·cm (N-03 / N-04)
• Stall / burst torque: approx. 2.8–3 kg·cm
• Nominal voltages available: 12 V, 18 V, 24 V (model dependent)
• No-load speeds and speeds @ max efficiency: ~2,550 rpm to 6,000 rpm depending on model
• Output power (max reported): up to 68.63 W
• Customizable features: voltage, speed, torque, shaft length/type, mounting patterns, optional gears/encoders, wire harnesses, EMC/noise countermeasures
• Compliance & testing: RoHS / REACH; noise and current tested before shipment