17S78

17S78 Brush DC Coreless Motor

17S78

The 17S78 design combines a high grade magnet with precious metal commutation in a dense package size. This coreless DC motor can deliver a torque greater than 2.8 mNm continuously, reaching up to 78% efficiency while maintaining a long lifetime.

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 17S78-208P.1 17S78-209E.1 17S78-210E.1
Motor Diameter (in) 0.669 0.669 0.669
Motor Diameter (mm) 17 17 17
Shaft Play - Axial (in) 0.0059 0.0059 0.0059
Shaft Play - Axial (mm) 0.15 0.15 0.15
Shaft Play - Radial (in) 0.0012 0.0012 0.0012
Shaft Play - Radial (mm) <0.03 <0.03 <0.03
Back EMF Constant (V/1000 rpm) 0.57 0.95 0.67
Continuous Current, Max (A) 0.5 0.32 0.38
Continuous Torque, Max (mNm) 2.6 2.8 2.4
Continuous Torque, Max (oz-in) 0.37 0.4 0.34
Mechanical Time Constant (ms) 12.8 11.3 15
Motor Regulation (10³/Nms) 255 225 300
No-Load Current, Typical (mA) 25 8.4 18
No-Load Speed (rpm) 10280 12430 10865
Nominal Voltage (V) 6 12 7.5
Rotor Inertia (gcm²) 0.5 0.5 0.5
Rotor Inertia (oz-in-sec² 10ˉ⁶) 7.078 7.078 7.078
Torque Constant (mNm/A) 5.4 9.1 6.4
Torque Constant (oz-in/A) 0.76 1.29 0.91
Weight (g) 19 19 19
Weight (oz) 0.67 0.67 0.67
Ambient Operating Temperature, Max: Rotor (°C) 100 100 100
Ambient Operating Temperature, Max: Rotor (°F) 212 212 212
Ambient Operating Temperature Range: Motor (°C) -30 to 85 -30 to 85 -30 to 85
Ambient Operating Temperature Range: Motor (°F) -22 to 185 -22 to 185 -22 to 185
Continuous Speed, Max (rpm) 10000 10000 10000
Efficiency 68% 78% 69%
Friction Torque (mNm) 0.12 0.08 0.12
Friction Torque (oz-in) 0.017 0.011 0.017
Output Power (W) 1.7 1.8 1.6
Rotor Inductance (mH) 0.15 0.35 0.23
Shaft Load, Max - Axial (5 mm. from bearing) (N) 1.5 1.5 1.5
Shaft Load, Max - Axial (5 mm. from bearing) (oz) 5.4 5.4 5.4
Shaft Load, Max - Radial (5 mm. from bearing) (N) 100 100 100
Shaft Load, Max - Radial (5 mm. from bearing) (oz) 359.6 359.6 359.6
Stall Torque at Nominal Voltage (mNm) 4.3 5.9 3.9
Stall Torque at Nominal Voltage (oz-in) 0.61 0.84 0.55
Terminal Resistance (Ohm) 7.5 18.6 12.2
Thermal Resistance (rotor/body) (°C/W) 13 / 38 13 / 38 13 / 38
Thermal Time Constant (rotor/stator) (s) 7 / 400 7 / 400 7 / 400
Document Document Type Language File Type
17S78 Specification Page Specification Page
17S78 drawing 2D Drawing
17S78 3D drawing 3D Drawing
Portescap MotionCompass: Guide to Interactive Motor Selection (brochure) Brochure