28L28

28L28 Brush DC Coreless Motor

28L28

Featuring a cost effective design with an Alnico magnet, this 28L28 brush DC motor continuously delivers a torque up to 20 mNm while reaching up to 80% efficiency and maintains a long lifetime.

Product Highlights

  • Ironless construction
  • Alnico magnet for high performance
  • 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

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Part Number 28L28-219.49 28L28-410E.49 28L28-413E.49 28L28-416E.49
Motor Diameter (in) 1.102 1.102 1.102 1.102
Motor Diameter (mm) 28 28 28 28
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) 0.0007 0.0007 0.0007 0.0007
Shaft Play - Radial (mm) <0.018 <0.018 <0.018 <0.018
Back EMF Constant (V/1000 rpm) 2.24 7.1 5.2 4.26
Continuous Current, Max (A) 0.95 0.28 0.4 0.53
Continuous Torque, Max (mNm) 19.9 18.5 19.4 21
Continuous Torque, Max (oz-in) 2.82 2.62 2.75 2.97
Mechanical Time Constant (ms) 13.5 16.7 17.8 21
Motor Regulation (10³/Nms) 13 15.4 13.4 11.8
No-Load Current, Typical (mA) 22 6.6 9 11
No-Load Speed (rpm) 5300 5000 5325 5590
Nominal Voltage (V) 12 36 28 24
Rotor Inertia (gcm²) 10.4 11 13.5 17.5
Rotor Inertia (oz-in-sec² 10ˉ⁶) 147.224 155.718 191.109 247.734
Torque Constant (mNm/A) 21.4 67.8 49.7 40.7
Torque Constant (oz-in/A) 3.03 9.6 7.04 5.76
Weight (g) 125 125 125 125
Weight (oz) 4.41 4.41 4.41 4.41
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) 8000 8000 8000 8000
Efficiency (%) 80 78 80 82
Friction Torque (mNm) 0.47 0.45 0.45 0.45
Friction Torque (oz-in) 0.067 0.064 0.064 0.064
Output Power (W) 9.6 9 9.3 10
Rotor Inductance (mH) 0.5 5.2 3.2 2.4
Shaft Load, Max - Axial (5 mm. from bearing) (N) 6 6 6 6
Shaft Load, Max - Axial (5 mm. from bearing) (oz) 21.6 21.6 21.6 21.6
Shaft Load, Max - Radial (5 mm. from bearing) (N) 250 250 250 250
Shaft Load, Max - Radial (5 mm. from bearing) (oz) 899.2 899.2 899.2 899.2
Stall Torque at Nominal Voltage (mNm) 43 34 32 50
Stall Torque at Nominal Voltage (oz-in) 6.09 4.81 4.53 7.08
Terminal Resistance (Ohm) 5.95 71 33 19.5
Thermal Resistance (rotor/body) (°C/W) 5 / 12 5 / 12 5 / 12 5 / 12
Thermal Time Constant (rotor/stator) (s) 13 / 760 13 / 760 13 / 760 13 / 760
Document Document Type Language File Type
28L28 Specification Page Specification Page
28L28 drawing 2D Drawing
28L28 3D drawing 3D Drawing
Portescap MotionCompass: Guide to Interactive Motor Selection (brochure) Brochure