17N78

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

Part Number 17N78-207E.1 17N78-208E.1 17N78-210E.1 17N78-216E.1
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
17N78 Specification Page Specification Page
17N78 drawing 2D Drawing
17N78 3D drawing 3D Drawing
Portescap MotionCompass: Guide to Interactive Motor Selection (brochure) Brochure