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17N78 Brush DC Coreless Motor
17N78
The 17N78 design combines high power density and precious metal commutation. This DC coreless motor can deliver a torque up to 5 mNm continuously, reaching up to 80% efficiency while maintaining a long lifetime. Portescap coreless motors can also be customized; from shaft lengths to mounting holes, this Brush DC Coreless Motor provides quality and efficiency.
Product Highlights
- Ironless construction
- Neodymium magnet for high performance
- High power density package
- Precious metal commutation
- Long brush life
- Compact design
- Winding possibilities
- REE windings to reduce electro erosion
Customization Available
- Cable or terminal outputs
- Coil modifications - resistance and inductance
- Custom shafts - flats, knurling, diameter, length
- Fixation holes
- Sleeve or ball bearings
Applications
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Part Number | 17N78-207E.1 | 17N78-208E.1 | 17N78-210E.1 | 17N78-216E.1 |
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Motor Diameter (in) | 0.669 | 0.669 | 0.669 | 0.669 |
Motor Diameter (mm) | 17 | 17 | 17 | 17 |
Shaft Play - Axial (in) | 0.0059 | 0.0059 | 0.0059 | 0.0059 |
Shaft Play - Axial (mm) | 0.15 | 0.15 | 0.15 | 0.15 |
Shaft Play - Radial (in) | 0.0012 | 0.0012 | 0.0012 | 0.0012 |
Shaft Play - Radial (mm) | <0.03 | <0.03 | <0.03 | <0.03 |
Back EMF Constant (V/1000 rpm) | 2.67 | 2.1 | 1.4 | 0.7 |
Continuous Current, Max (A) | 0.19 | 0.25 | 0.37 | 0.86 |
Continuous Torque, Max (mNm) | 4.8 | 4.9 | 4.8 | 5.7 |
Continuous Torque, Max (oz-in) | 0.68 | 0.69 | 0.68 | 0.81 |
Mechanical Time Constant (ms) | 7.2 | 7.2 | 7.7 | 7.8 |
Motor Regulation (10³/Nms) | 99.96 | 95.05 | 96.35 | 71.29 |
No-Load Current, Typical (mA) | 3.5 | 4.9 | 7.7 | 16 |
No-Load Speed (rpm) | 8900 | 8460 | 8460 | 8480 |
Nominal Voltage (V) | 24 | 18 | 12 | 6 |
Rotor Inertia (gcm²) | 0.72 | 0.76 | 0.8 | 1.1 |
Rotor Inertia (oz-in-sec² 10ˉ⁶) | 10.192 | 10.759 | 11.325 | 15.572 |
Torque Constant (mNm/A) | 25.5 | 20.1 | 13.4 | 6.7 |
Torque Constant (oz-in/A) | 3.61 | 2.85 | 1.9 | 0.95 |
Weight (g) | 27 | 27 | 27 | 27 |
Weight (oz) | 0.95 | 0.95 | 0.95 | 0.95 |
Ambient Operating Temperature, Max: Rotor (°C) | 100 | 100 | 100 | 100 |
Ambient Operating Temperature, Max: Rotor (°F) | 212 | 212 | 212 | 212 |
Ambient Operating Temperature Range: Motor (°C) | -30 to 85 | -30 to 85 | -30 to 85 | -30 to 85 |
Ambient Operating Temperature Range: Motor (°F) | -22 to 185 | -22 to 185 | -22 to 185 | -22 to 185 |
Continuous Speed, Max (rpm) | 10000 | 10000 | 10000 | 10000 |
Efficiency (%) | 81 | 81 | 80 | 82 |
Friction Torque (mNm) | 0.09 | 0.1 | 0.1 | 0.1 |
Friction Torque (oz-in) | 0.013 | 0.014 | 0.014 | 0.014 |
Output Power (W) | 3.1 | 3.2 | 3.1 | 3.6 |
Rotor Inductance (mH) | 1.41 | 0.9 | 0.4 | 0.11 |
Shaft Load, Max - Axial (5 mm. from bearing) (N) | 1.5 | 1.5 | 1.5 | 1.5 |
Shaft Load, Max - Axial (5 mm. from bearing) (oz) | 5.4 | 5.4 | 5.4 | 5.4 |
Shaft Load, Max - Radial (5 mm. from bearing) (N) | 100 | 100 | 100 | 100 |
Shaft Load, Max - Radial (5 mm. from bearing) (oz) | 359.6 | 359.6 | 359.6 | 359.6 |
Stall Torque at Nominal Voltage (mNm) | 9.4 | 9.4 | 9.3 | 12.5 |
Stall Torque at Nominal Voltage (oz-in) | 1.33 | 1.33 | 1.32 | 1.77 |
Terminal Resistance (Ohm) | 65 | 38.4 | 17.3 | 3.2 |
Thermal Resistance (rotor/body) (°C/W) | 10 / 30 | 10 / 30 | 10 / 30 | 10 / 30 |
Thermal Time Constant (rotor/stator) (s) | 7 / 400 | 7 / 400 | 7 / 400 | 7 / 400 |
Document | Document Type | Language | File Type |
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17N78 Specification Page | Specification Page |
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17N78 drawing | 2D Drawing |
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17N78 3D drawing | 3D Drawing |
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Portescap MotionCompass: Guide to Interactive Motor Selection (brochure) | Brochure |
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