The 1221N5M2B series features 12mm micro DC coreless motors with precious metal commutation, delivering high efficiency and reliability for demanding applications. Designed for precision in medical devices, healthcare products, robotics, and industrial automation. Customizable with shaft lengths, special coils, or gearheads to suit specialized requirements. Ideal for compact installations requiring smooth operation and long service life.
| Parameter | Unit | 1221N5M2B27-28-3.0 | 1221N5M2B34-78-3.3 | 1221N5M2B55-79-3.3 | 1221N5M2B45-84-5.0 | 1221N5M2B58-91-12.0 |
|---|---|---|---|---|---|---|
| Voltage | V | 3.0 | 3.3 | 3.3 | 5.0 | 12.0 |
| Terminal resistance | Ω | 37 | 6.4 | 6.9 | 9.8 | 50 |
| No-load speed | rpm | 2800 | 7800 | 7900 | 8400 | 9100 |
| No-load current | mA | 5 | 12 | 15 | 10 | 5 |
| Stall torque | mNm | 0.7 | 2.0 | 1.8 | 2.8 | 2.9 |
| Stall current | mA | 80 | 520 | 480 | 510 | 240 |
| Nominal torque | mNm | 0.1 | 0.2 | 0.2 | 0.5 | 0.5 |
| Nominal speed | rpm | 2410 | 7020 | 7020 | 6890 | 7530 |
| Nominal current | mA | 20 | 60 | 70 | 100 | 50 |
| Max. output power | W | 0.05 | 0.41 | 0.37 | 0.61 | 0.69 |
| Max. efficiency | % | 56 | 72 | 68 | 74 | 73 |
| Back-EMF constant | mV/rpm | 1.0 | 0.4 | 0.4 | 0.6 | 1.3 |
| Torque constant | mNm/A | 9.6 | 3.9 | 3.9 | 5.6 | 12.3 |
| Speed/torque gradient | rpm/mNm | 3900 | 3900 | 4400 | 3000 | 3100 |
| Rotor inertia | gcm² | 0.15 | 0.15 | 0.15 | 0.15 | 0.15 |
| Weight | g | 10.4 | 10.4 | 10.4 | 10.4 | 10.4 |
| Thermal resistance housing-ambient | K/W | 33.3 | 33.3 | 33.3 | 33.3 | 33.3 |
| Thermal resistance winding-housing | K/W | 35.3 | 35.3 | 35.3 | 35.3 | 35.3 |
| Thermal time constant motor | s | 144 | 144 | 144 | 144 | 144 |
| Thermal time constant winding | s | 120 | 120 | 120 | 120 | 120 |
| Operating temperature range | °C | -20~+85 | -20~+85 | -20~+85 | -20~+85 | -20~+85 |
| Thermal class of winding | °C | 130 | 130 | 130 | 130 | 130 |
| Axial play | mm | 0.02~0.15 | 0.02~0.15 | 0.02~0.15 | 0.02~0.15 | 0.02~0.15 |
| Radial play | mm | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 |
| Axial load dynamic | N | 0.8 | 0.8 | 0.8 | 0.8 | 0.8 |
| Axial load static | N | 30 | 30 | 30 | 30 | 30 |
| Radial load at 3 mm from mounting face | N | 1 | 1 | 1 | 1 | 1 |
| No. of pole pairs | 1 | 1 | 1 | 1 | 1 | |
| Bearings | 2 ball bearings | 2 ball bearings | 2 ball bearings | 2 ball bearings | 2 ball bearings | |
| Commutator | metal 5 segments | metal 5 segments | metal 5 segments | metal 5 segments | metal 5 segments | |
| Protection class | IP | 40 | 40 | 40 | 40 | 40 |
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 | 1221N5M2B27-28-3.0 |
|---|---|---|
| Voltage | V | 3.0 |
| Terminal resistance | Ω | 37 |
| No-load speed | rpm | 2800 |
| No-load current | mA | 5 |
| Stall torque | mNm | 0.7 |
| Stall current | mA | 80 |
| Nominal torque | mNm | 0.1 |
| Nominal speed | rpm | 2410 |
| Nominal current | mA | 20 |
| Max. output power | W | 0.05 |
| Max. efficiency | % | 56 |
| Back-EMF constant | mV/rpm | 1.0 |
| Torque constant | mNm/A | 9.6 |
| Speed/torque gradient | rpm/mNm | 3900 |
| Rotor inertia | gcm² | 0.15 |
| Weight | g | 10.4 |
| Thermal resistance housing-ambient | K/W | 33.3 |
| Thermal resistance winding-housing | K/W | 35.3 |
| Thermal time constant motor | s | 144 |
| Thermal time constant winding | s | 120 |
| Operating temperature range | °C | -20~+85 |
| Thermal class of winding | °C | 130 |
| Axial play | mm | 0.02~0.15 |
| Radial play | mm | 0.025 |
| Axial load dynamic | N | 0.8 |
| Axial load static | N | 30 |
| Radial load at 3 mm from mounting face | N | 1 |
| No. of pole pairs | 1 | |
| Bearings | 2 ball bearings | |
| Commutator | metal 5 segments | |
| Protection class | IP | 40 |
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 | 1221N5M2B34-78-3.3 |
|---|---|---|
| Voltage | V | 3.3 |
| Terminal resistance | Ω | 6.4 |
| No-load speed | rpm | 7800 |
| No-load current | mA | 12 |
| Stall torque | mNm | 2.0 |
| Stall current | mA | 520 |
| Nominal torque | mNm | 0.2 |
| Nominal speed | rpm | 7020 |
| Nominal current | mA | 60 |
| Max. output power | W | 0.41 |
| Max. efficiency | % | 72 |
| Back-EMF constant | mV/rpm | 0.4 |
| Torque constant | mNm/A | 3.9 |
| Speed/torque gradient | rpm/mNm | 3900 |
| Rotor inertia | gcm² | 0.15 |
| Weight | g | 10.4 |
| Thermal resistance housing-ambient | K/W | 33.3 |
| Thermal resistance winding-housing | K/W | 35.3 |
| Thermal time constant motor | s | 144 |
| Thermal time constant winding | s | 120 |
| Operating temperature range | °C | -20~+85 |
| Thermal class of winding | °C | 130 |
| Axial play | mm | 0.02~0.15 |
| Radial play | mm | 0.025 |
| Axial load dynamic | N | 0.8 |
| Axial load static | N | 30 |
| Radial load at 3 mm from mounting face | N | 1 |
| No. of pole pairs | 1 | |
| Bearings | 2 ball bearings | |
| Commutator | metal 5 segments | |
| Protection class | IP | 40 |
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 | 1221N5M2B55-79-3.3 |
|---|---|---|
| Voltage | V | 3.3 |
| Terminal resistance | Ω | 6.9 |
| No-load speed | rpm | 7900 |
| No-load current | mA | 15 |
| Stall torque | mNm | 1.8 |
| Stall current | mA | 480 |
| Nominal torque | mNm | 0.2 |
| Nominal speed | rpm | 7020 |
| Nominal current | mA | 70 |
| Max. output power | W | 0.37 |
| Max. efficiency | % | 68 |
| Back-EMF constant | mV/rpm | 0.4 |
| Torque constant | mNm/A | 3.9 |
| Speed/torque gradient | rpm/mNm | 4400 |
| Rotor inertia | gcm² | 0.15 |
| Weight | g | 10.4 |
| Thermal resistance housing-ambient | K/W | 33.3 |
| Thermal resistance winding-housing | K/W | 35.3 |
| Thermal time constant motor | s | 144 |
| Thermal time constant winding | s | 120 |
| Operating temperature range | °C | -20~+85 |
| Thermal class of winding | °C | 130 |
| Axial play | mm | 0.02~0.15 |
| Radial play | mm | 0.025 |
| Axial load dynamic | N | 0.8 |
| Axial load static | N | 30 |
| Radial load at 3 mm from mounting face | N | 1 |
| No. of pole pairs | 1 | |
| Bearings | 2 ball bearings | |
| Commutator | metal 5 segments | |
| Protection class | IP | 40 |
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 | 1221N5M2B45-84-5.0 |
|---|---|---|
| Voltage | V | 5.0 |
| Terminal resistance | Ω | 9.8 |
| No-load speed | rpm | 8400 |
| No-load current | mA | 10 |
| Stall torque | mNm | 2.8 |
| Stall current | mA | 510 |
| Nominal torque | mNm | 0.5 |
| Nominal speed | rpm | 6890 |
| Nominal current | mA | 100 |
| Max. output power | W | 0.61 |
| Max. efficiency | % | 74 |
| Back-EMF constant | mV/rpm | 0.6 |
| Torque constant | mNm/A | 5.6 |
| Speed/torque gradient | rpm/mNm | 3000 |
| Rotor inertia | gcm² | 0.15 |
| Weight | g | 10.4 |
| Thermal resistance housing-ambient | K/W | 33.3 |
| Thermal resistance winding-housing | K/W | 35.3 |
| Thermal time constant motor | s | 144 |
| Thermal time constant winding | s | 120 |
| Operating temperature range | °C | -20~+85 |
| Thermal class of winding | °C | 130 |
| Axial play | mm | 0.02~0.15 |
| Radial play | mm | 0.025 |
| Axial load dynamic | N | 0.8 |
| Axial load static | N | 30 |
| Radial load at 3 mm from mounting face | N | 1 |
| No. of pole pairs | 1 | |
| Bearings | 2 ball bearings | |
| Commutator | metal 5 segments | |
| Protection class | IP | 40 |
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 | 1221N5M2B58-91-12.0 |
|---|---|---|
| Voltage | V | 12.0 |
| Terminal resistance | Ω | 50 |
| No-load speed | rpm | 9100 |
| No-load current | mA | 5 |
| Stall torque | mNm | 2.9 |
| Stall current | mA | 240 |
| Nominal torque | mNm | 0.5 |
| Nominal speed | rpm | 7530 |
| Nominal current | mA | 50 |
| Max. output power | W | 0.69 |
| Max. efficiency | % | 73 |
| Back-EMF constant | mV/rpm | 1.3 |
| Torque constant | mNm/A | 12.3 |
| Speed/torque gradient | rpm/mNm | 3100 |
| Rotor inertia | gcm² | 0.15 |
| Weight | g | 10.4 |
| Thermal resistance housing-ambient | K/W | 33.3 |
| Thermal resistance winding-housing | K/W | 35.3 |
| Thermal time constant motor | s | 144 |
| Thermal time constant winding | s | 120 |
| Operating temperature range | °C | -20~+85 |
| Thermal class of winding | °C | 130 |
| Axial play | mm | 0.02~0.15 |
| Radial play | mm | 0.025 |
| Axial load dynamic | N | 0.8 |
| Axial load static | N | 30 |
| Radial load at 3 mm from mounting face | N | 1 |
| No. of pole pairs | 1 | |
| Bearings | 2 ball bearings | |
| Commutator | metal 5 segments | |
| Protection class | IP | 40 |
Technical specifications are for guidance only, as the individual drives and motors are configured for specific applications. Subject to technical and visual changes.
