The BO2820N2B series is a compact 28mm brushless DC outer rotor motor designed for sensorless operation. Engineered for high reliability and efficiency, it offers versatile voltage options (12V, 24V, 36V). Customization includes lead wire and shaft length, special coils, gearheads, encoders, and dedicated drivers. Ideal for UAVs and aeromodelling applications where space, weight, and performance are critical.
| Parameter | Unit | BO2820N2B01-140-12.0 | BO2820N2B02-140-24.0 | BO2820N2B03-140-36.0 |
|---|---|---|---|---|
| Voltage | V | 12.0 | 24.0 | 36.0 |
| Terminal resistance | Ω | 0.14 | 0.58 | 1.22 |
| No-load speed | rpm | 14000 | 14000 | 14000 |
| No-load current | A | 0.48 | 0.24 | 0.16 |
| Stall torque | mNm | 698 | 664 | 718 |
| Stall current | A | 86.3 | 41.2 | 29.6 |
| Nominal torque | mNm | 68.5 | 75 | 73 |
| Nominal speed | rpm | 10350 | 10680 | 11310 |
| Nominal current | A | 9.1 | 4.7 | 3.0 |
| Max. output power | W | 256 | 244 | 263 |
| Max. efficiency | % | 85.6 | 85.1 | 85.9 |
| Back-EMF constant | mV/rpm | 0.9 | 1.7 | 2.6 |
| Torque constant | mNm/A | 8.1 | 16.2 | 24.4 |
| KV Value | rpm/V | 1168 | 585 | 389 |
| Speed/torque gradient | rpm/mNm | 20.1 | 21.2 | 19.5 |
| Rotor inertia | gcm² | 19 | 19 | 19 |
| Weight | g | 41 | 41 | 41 |
| Thermal resistance housing-ambient | K/W | 2.3 | 2.3 | 2.3 |
| Thermal resistance winding-housing | K/W | 2 | 2 | 2 |
| Thermal time constant motor | s | 280 | 280 | 280 |
| Thermal time constant winding | s | 37 | 37 | 37 |
| Operating temperature range | °C | -40~+120 | -40~+120 | -40~+120 |
| Thermal class of winding | °C | 180 | 180 | 180 |
| Axial play | mm | 0.012 | 0.012 | 0.012 |
| Radial play | mm | 0.008 | 0.008 | 0.008 |
| Axial load dynamic | N | 5 | 5 | 5 |
| Axial load static | N | 80 | 80 | 80 |
| Radial load at 3 mm from mounting face | N | 29 | 29 | 29 |
| No. of pole pairs | 7 | 7 | 7 | |
| Bearings | 2 ball bearings | 2 ball bearings | 2 ball bearings | |
| Commutation | Sensorless | Sensorless | Sensorless | |
| Protection class | IP | 20 | 20 | 20 |
Technical specifications are for guidance only, as the individual drives and motors are configured for specific applications. Subject to technical and visual changes.
| Parameter | Unit | BO2820N2B01-140-12.0 |
|---|---|---|
| Voltage | V | 12.0 |
| Terminal resistance | Ω | 0.14 |
| No-load speed | rpm | 14000 |
| No-load current | A | 0.48 |
| Stall torque | mNm | 698 |
| Stall current | A | 86.3 |
| Nominal torque | mNm | 68.5 |
| Nominal speed | rpm | 10350 |
| Nominal current | A | 9.1 |
| Max. output power | W | 256 |
| Max. efficiency | % | 85.6 |
| Back-EMF constant | mV/rpm | 0.9 |
| Torque constant | mNm/A | 8.1 |
| KV Value | rpm/V | 1168 |
| Speed/torque gradient | rpm/mNm | 20.1 |
| Rotor inertia | gcm² | 19 |
| Weight | g | 41 |
| Thermal resistance housing-ambient | K/W | 2.3 |
| Thermal resistance winding-housing | K/W | 2 |
| Thermal time constant motor | s | 280 |
| Thermal time constant winding | s | 37 |
| Operating temperature range | °C | -40~+120 |
| Thermal class of winding | °C | 180 |
| Axial play | mm | 0.012 |
| Radial play | mm | 0.008 |
| Axial load dynamic | N | 5 |
| Axial load static | N | 80 |
| Radial load at 3 mm from mounting face | N | 29 |
| No. of pole pairs | 7 | |
| Bearings | 2 ball bearings | |
| Commutation | Sensorless | |
| Protection class | IP | 20 |
Technical specifications are for guidance only, as the individual drives and motors are configured for specific applications. Subject to technical and visual changes.
| Parameter | Unit | BO2820N2B02-140-24.0 |
|---|---|---|
| Voltage | V | 24.0 |
| Terminal resistance | Ω | 0.58 |
| No-load speed | rpm | 14000 |
| No-load current | A | 0.24 |
| Stall torque | mNm | 664 |
| Stall current | A | 41.2 |
| Nominal torque | mNm | 75 |
| Nominal speed | rpm | 10680 |
| Nominal current | A | 4.7 |
| Max. output power | W | 244 |
| Max. efficiency | % | 85.1 |
| Back-EMF constant | mV/rpm | 1.7 |
| Torque constant | mNm/A | 16.2 |
| KV Value | rpm/V | 585 |
| Speed/torque gradient | rpm/mNm | 21.2 |
| Rotor inertia | gcm² | 19 |
| Weight | g | 41 |
| Thermal resistance housing-ambient | K/W | 2.3 |
| Thermal resistance winding-housing | K/W | 2 |
| Thermal time constant motor | s | 280 |
| Thermal time constant winding | s | 37 |
| Operating temperature range | °C | -40~+120 |
| Thermal class of winding | °C | 180 |
| Axial play | mm | 0.012 |
| Radial play | mm | 0.008 |
| Axial load dynamic | N | 5 |
| Axial load static | N | 80 |
| Radial load at 3 mm from mounting face | N | 29 |
| No. of pole pairs | 7 | |
| Bearings | 2 ball bearings | |
| Commutation | Sensorless | |
| Protection class | IP | 20 |
Technical specifications are for guidance only, as the individual drives and motors are configured for specific applications. Subject to technical and visual changes.
| Parameter | Unit | BO2820N2B03-140-36.0 |
|---|---|---|
| Voltage | V | 36.0 |
| Terminal resistance | Ω | 1.22 |
| No-load speed | rpm | 14000 |
| No-load current | A | 0.16 |
| Stall torque | mNm | 718 |
| Stall current | A | 29.6 |
| Nominal torque | mNm | 73 |
| Nominal speed | rpm | 11310 |
| Nominal current | A | 3.0 |
| Max. output power | W | 263 |
| Max. efficiency | % | 85.9 |
| Back-EMF constant | mV/rpm | 2.6 |
| Torque constant | mNm/A | 24.4 |
| KV Value | rpm/V | 389 |
| Speed/torque gradient | rpm/mNm | 19.5 |
| Rotor inertia | gcm² | 19 |
| Weight | g | 41 |
| Thermal resistance housing-ambient | K/W | 2.3 |
| Thermal resistance winding-housing | K/W | 2 |
| Thermal time constant motor | s | 280 |
| Thermal time constant winding | s | 37 |
| Operating temperature range | °C | -40~+120 |
| Thermal class of winding | °C | 180 |
| Axial play | mm | 0.012 |
| Radial play | mm | 0.008 |
| Axial load dynamic | N | 5 |
| Axial load static | N | 80 |
| Radial load at 3 mm from mounting face | N | 29 |
| No. of pole pairs | 7 | |
| Bearings | 2 ball bearings | |
| Commutation | Sensorless | |
| Protection class | IP | 20 |
Technical specifications are for guidance only, as the individual drives and motors are configured for specific applications. Subject to technical and visual changes.
