Products

28LT12 Brush DC Coreless Motor

28LT12 - 28LT12 Brush DC Coreless Motor

28LT12

The 28LT12 is a cost efficient solution for applications requiring acceleration (start/stop) with a long brush lifetime.

Motor Highlights

  • Ironless construction

  • Alnico magnet

  • Graphite/copper commutation

  • Long brush lifetime

  • Winding possibilities

  • Low self heating

Customization Available

  • Shaft lengths
  • Special coils
  • Cables and connectors
  • Ball bearings
  • Fixation holes

Applications

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Specification + Detail
Resources
Metric English 
Winding{%|%}unit 28LT12-219.49 28LT12-416E.49
Diameter{%|%}in 1.10 1.10
Diameter{%|%}mm 28 28
Nominal Voltage{%|%}V 18.0 32.0
Optimization{%|%}rpm
No-Load Speed{%|%}rpm 7,860 7,345
Type
Resolution{%|%}line counts
Supply Voltage{%|%}V
Supply Current - typical{%|%}mA
Supply Current - maxium{%|%}mA
Supply Current - stand-by{%|%}μA
Rise time{%|%}ns
Fall time{%|%}ns
No-Load Current{%|%}mA 65.0 35.0
Max continuous mechanical power{%|%}@ 25°C
Max continuous Current{%|%}A
Max Continuous Torque{%|%}mNm
Max Continuous Torque{%|%}oz-in
Terminal Resistance{%|%}Ω 6.2 19.9
Output Power{%|%}W 19.0 20.0
Stall Torque{%|%}oz-in 8.92 9.20
Stall Torque{%|%}mNm 63.00 65.00
Efficiency{%|%}% 72 73
Speeds up to{%|%}rpm 10,000 10,000
Torque up to{%|%}oz-in 3.26 3.40
Torque up to{%|%}mNm 23.00 24.00
Current up to, thermal limits{%|%}Amp 1.13 0.63
Back-EMF Constant{%|%}V/1000 rpm 2.24 4.26
Torque Constant{%|%}mNm/A 21.4 40.7
Torque Constant{%|%}oz-in/A 3.03 5.76
Motor Regulation R/k²{%|%}10³/Nms 13 12
Motor regulation k/R½{%|%}mNm/W
Motor regulation k/R½{%|%}oz-in/W
Internal resistance - phase to phase (W)
Line to Line resistance at connectors (Ω)
Inductance - phase to phase (mH)
Friction Torque{%|%}oz-in 0.197 0.201
Friction Torque{%|%}mNm 1.39 1.42
Rotor Inductance{%|%}µH 500 2,400
Mechanical Time Constant{%|%}ms 14.0 21.0
Rotor Inertia{%|%}gcm²
Rotor Inertia{%|%}gcm² 10.700 17.800
Thermal Resistance{%|%}C/W 5/12 5/12
Thermal Time Constant{%|%}C/W 27/760 27/760
Weight{%|%}oz 4.76 4.76
Weight{%|%}g 135.0 135.0
Absolute accuracy 2 ph. On, Full step mode (degree)
Ambient working temperature range (C)
Ambient working temperature range (F)
Bearing Type
Detent Torque, Max (mNm)
Detent Torque, Max (oz-in)
Dielectric Withstanding Voltage (VAC)
Holding Torque, MIN (mNm)
Holding Torque, MIN (oz-in)
Inductance per Phase, typ (mH)
Insulation Resistance at 500 VDC (Mohms)
Leadwire
Maximum Coil Temperature (C)
Maximum Coil Temperature (F)
Operating Voltage (VDC)
Rated Current per Phase, 1 Phase ON (A)
Resistance per Phase, ± 10% (Ohms)
Rotor Inertia (oz-in-sec²10{%SUP%}-6{%/SUP%})
Electrical time constant (ms)
Max motor speed (rpm)
Ambient storage temperature range (C)
Ambient storage temperature range (F)
Ball bearings preload (N)
Axial static force without shaft support (N)
Max winding temperature (C)
Max Winding Temperature (C)
Max Winding Temperature (F)
Max winding temperature (F)
Hall Sensor Elecrical Phasing (degree)
Typical Housing Material
Continuous Stall Current (A)
Peak Torque for 1s (mNm)
Peak Torque for 1s (oz-in)
Peak Current (A)
Max Axial Shaft Load (N)
Max Axial Shaft Load (oz)
Max Radial Shaft Load (N)
Max Radial Shaft Load (oz)
Shaft Load Max Axial (lb)
Shaft Load Max Axial (N)
Shaft Load Max Radial (lb)
Shaft Load Max Radial (N)
Length (in)
Length (mm)
Steps per Revolution
Back EMF Amplitude (V/ksteps/s)
Nominal Phase Current (1 ph. On) (A)
Nominal Phase Current (2 ph. On) (A)
Angular Acceleration (nominal current)
Axial Shaft Play (µm)
Holding Torque Typical (mNm)
Holding Torque Typical (oz-in)
Holding Torque, 1.5x nominal current (mNm)
Holding Torque, 1.5x nominal current (oz-in)
Natural Resonance Frequency @nominal current (Hz)
Power rate (nominal current) (kW/s)
Radial Shaft Play (µm)
Max. Force* @ .001" (0.0254 mm) / Step (N)
Max. Force* @ .001" (0.0254 mm) / Step (oz)
Max. Force* @ .002" (0.0508 mm) / Step (N)
Max. Force* @ .002" (0.0508 mm) / Step (oz)
Max. Force* @ .004"(0.1016 mm) / Step (N)
Max. Force* @ .004"(0.1016 mm) / Step (oz)
Stroke Length, Typ{%|%}mm
Stroke Length, Typ{%|%}in
Min. Holding Force (Unenergized) @ .0005" (0.0127 mm) / Step{%|%}N
Min. Holding Force (Unenergized) @ .0005" (0.0127 mm) / Step{%|%}oz
Min. Holding Force @ 0.001" (0.0254 mm) / Step (Un-energised) (N)
Min. Holding Force @ 0.001" (0.0254 mm) / Step (Un-energised) (oz)
Min. Holding Force @ 0.002" (0.0508 mm) / Step (Un-energised) (N)
Min. Holding Force @ 0.002" (0.0508 mm) / Step (Un-energised) (oz)
Min. Holding Force (Unenergized) @ 0.003" (0.0762 mm) / Step (Un-energized){%|%}N
Min. Holding Force (Unenergized) @ 0.003" (0.0762 mm) / Step (Un-energized){%|%}oz
Min. Holding Force @ 0.004" (0.1016 mm) / Step (Un-energised) (N)
Min. Holding Force @ 0.004" (0.1016 mm) / Step (Un-energised) (oz)
Min. Holding Force @ rated current @ .0005" (0.0127 mm) / Step{%|%}N
Min. Holding Force @ rated current @ .0005" (0.0127 mm) / Step{%|%}oz
Min. Holding Force @ rated current @ .001" (0.0254 mm) / Step{%|%}N
Min. Holding Force @ rated current @ .001" (0.0254 mm) / Step{%|%}oz
Min. Holding Force @ rated current @ .002" (0.058 mm) / Step{%|%}N
Min. Holding Force @ rated current @ .002" (0.058 mm) / Step{%|%}oz
Min. Holding Force @ rated current @ .003" (0.0762 mm) / Step{%|%}N
Min. Holding Force @ rated current @ .003" (0.0762 mm) / Step{%|%}oz
Min. Holding Force @ rated current @ .004" (0.1016 mm) / Step{%|%}N
Min. Holding Force @ rated current @ .004" (0.1016 mm) / Step{%|%}oz
Output signal{%|%}MHz
Direction of rotation ( = / ≠)
Max. Recommended Input Speed (rpm)
Number of gear stages
Electrical phase shift{%|%}degree
Duty cycle{%|%}%
Maximum count frequency{%|%}kHz
Maximum speed @ 512 ppr{%|%}10{%SUP%}-7{%/SUP%} x kgm²
Maximum speed @ 1024 ppr{%|%}10{%SUP%}-7{%/SUP%} x kgm²
Operating Temperature Range: Rotor{%|%}°C 100C 100C
Operating Temperature Range: Motor{%|%}°C -30C to 85C -30C to 85C
Operating Temperature Range: Motor{%|%}°F -22F to 185F -22F to 185F
Operating Temperature Range: Rotor{%|%}°F 212F 212F
Code wheel moment of inertia{%|%}10{%SUP%}-7{%/SUP%} x kgm²
Linear Travel Accuracy
Input Power (W)
Input Power (W)
Stepper Type
Document Technology Document Type Language File Type
28LT12 drawing Brush DC DXF Drawing  
28LT12 Specification Sheet Brush DC Specification Page  
28lt_12 3D drawing Brush DC 3D  
Miniature Motors for Automated Solutions (brochure) Literature  
Portescap MotionCompass: Guide to Interactive Motor Selection (brochure) Literature