FA-2840RB Coreless Brushless DC Motor
FA-2840RB is a 25W large-diameter coreless brushless DC motor with 28mm outer diameter and 40mm body length. Equipped with double ball bearings, it integrates 3-channel hall sensor and built-in NTC temperature sensor to realize real-time temperature monitoring and stable closed-loop speed regulation. This model comes with four winding variants covering 12V and 24V industrial voltages, with separate high-speed and high-torque performance curves. It adopts integrated 9-pin all-black wiring harness; planetary gearbox and multi-type encoders are available as matched accessories.
• Dimension: Φ28mm × Length 40mm
• Rated Power: 25W
• Voltage Options: 12V(03A/01A) / 24V(04A/02A)
• Double ball bearings + 3CH Hall sensor + NTC overheat sensor
• Integrated 9Pin all-black wiring; Optional planetary gearbox & encoder
Mechanical Dimensions
Dimensions are in mm. Please refer to the datasheet for tolerances and mounting details.
Performance Parameters
| Motor specifications | 03A | 01A | 04A | 02A | |
|---|---|---|---|---|---|
| Nominal voltage | V | 12 | 12 | 24 | 24 |
| No load speed | rpm | 9000 | 12500 | 9000 | 12500 |
| No load current | mA | 100 | 150 | 700 | 90 |
| Nominal speed | rpm | 8100 | 11300 | 8100 | 11300 |
| Nominal torque | mNm | 12.73 | 18.34 | 12.65 | 20 |
| Nominal current | A | 1.09 | 2.14 | 0.56 | 1.17 |
| Stall torque | mNm | 134 | 0.57 | 4.59 | 2.8 |
| Stall current | A | 10.53 | 21.05 | 24.95 | 17.97 |
| Terminal resistance | Ω | 1.14 | 0.57 | 375 | 520 |
| Torque constant | mNm/A | 12.47 | 8.98 | 3.9 | 3.43 |
| Speed constant | rpm/V | 750 | 1041 | 375 | 520 |
| Mechanical time constant | ms | 3.88 | 3.74 | 3.9 | 3.43 |
| Rotor inertia | gcm² | 5.78 | 5.78 | 5.78 | 5.78 |
Optical Gearbox
| N/A | |
|---|---|
Optional encoder
| N/A | |
|---|---|
Terminal data
| Terminal data | ||
|---|---|---|
| Teminal model :Pin 1 ~ Pin 3 XHP-3 XH2.5 AWG24铁氟龙线 | Pin 4 ~ Pin 5 | MOLEX SD-51021-006 PH1.25 AWG26 PE排线 |
| Pin 1 电机绕组Motor winding 3 黑色Black | Pin 2 电机绕组 Motor winding 1 黄色Yellow | Pin 3 电机绕组Motor winding 2 红色Red |
| Pin 4 温控传感器NTC 黑色Black | Pin 5 霍尔传感器Hall GND 黑色Black | Pin 6 霍尔传感器Hall Vcc 3.3~5V 黑色Black |
| Pin 7 霍尔传感器Hall sensor 1 黑色Black | Pin 8 霍尔传感器Hall sensor 2 黑色Black | Pin 9 霍尔传感器Hall sensor 3 黑色Black |
Other Specifications
| Other specifications | |||
|---|---|---|---|
| Operating temperature range | -20…+80℃ | Bearing type | Ball bearings |
| Number of pole pairs | 1 | Weight of motor | 105g |
| Number of phases | 3 |
Engineering Overview
FA-2840RB coreless BLDC removes iron cogging torque and brush abrasion, delivering smooth low-vibration rotation and long service life. Built-in NTC sensor realizes real-time overheat detection to improve operation safety. Integrated 9Pin wiring simplifies assembly and reduces signal interference. 12V/24V multi-winding options cover diverse equipment demands, with high stall torque to handle medium-heavy loads. Matched gearbox and encoders support high-precision closed-loop speed and position control.
Typical Applications:
• High-end handheld beauty & tattoo devices
• Portable dental & surgical precision instruments
• Medium-load miniature robot joint actuators
• Laboratory precision testing micro drive modules