Products

Miniature Linear Actuator

20DAM-K - Miniature Linear Actuator

20DAM-K

Miniature Linear Motor

The smallest of our miniature linear stepper motor line, is the 20DAM-K which is a high-performance captive miniature linear actuator that provides up to 30.6 N of linear force in a 20mm frame size.  The miniature linear motor is a can stack stepper motor with a built-in leadscrew to directly convert rotary motion into linear motion. Using the basic can stack stepper motor design, the miniature linear stepper actuator has a 15 degree step angle. The rotor magnet sits on a thermoplastic nut captured between two ball bearings secured in the end caps. Depending on the level of integration required, the DLA can be captive (limited travel) or non-captive (extended travel).

As the step error is non-cumulative, high accuracies are achieved across long or short travel distances, meaning costly positional feedback devices such as encoders can be eliminated. Miniature linear motors can be operated in single step, half step or micro stepping modes leading to improved resolution and quieter operation.

Motor Highlights

  • High continuous linear force output for size
  • Digitally controlled - easy to use with a micro processor
  • Cost effective - compact design, lower integration cost
  • Maintenance free - no brushes to replace
  • Unipolar and bipolar winding options
  • Captive and non-captive linear actuator designs
  • Long life - ball bearing design

Customization Available

  • Coil modifications - resistance and inductance.
  • Magnets - to yield higher linear force or reduced detent levels
  • Higher strength plastics for higher impact forces
  • Reduced or increased detent force to suit the application
  • Screw - metric or imperial tips, length
  • Special flanges, connectors, end of motion detection sensors
  • Wire harness - connectors, pins, lead length, shrink tubing

Applications

Specification + Detail
Resources
Metric English 
Winding{%|%}unit 20DAMXXD1B-K 20DAMXXD1U-K 20DAMXXD2B-K 20DAMXXD2U-K
Diameter{%|%}in 0.79 0.79 0.79 0.79
Diameter{%|%}mm 20.0 20.0 20.0 20.0
Length (mm)
Length (in)
Operating Voltage #{%|%}V 5.00 5.00 12.00 12.00
Resistance per Phase, ± 10%{%|%}Ohms 20.0 20.0 115.2 115.2
Inductance per Phase, typ{%|%}mH 7.2 3.8 40.8 20.3
Nominal Phase Current, 2 ph. On (A)
Nominal Phase Current, 1 ph. On (A)
Back-EMF Constant (V/1000 rpm)
Back EMF Amplitude (V/ksteps/s)
Holding Torque, MIN (mNm)
Holding Torque, MIN (oz-in)
Holding Torque Typical (mNm)
Holding Torque Typical (oz-in)
Holding Torque, 1.5x nominal current (mNm)
Holding Torque, 1.5x nominal current (oz-in)
Detent Torque, Typical (mNm)
Detent Torque, Typical (oz-in)
Rated Current per Phase, 1 Phase ON{%|%}A 0.35 0.35 0.14 0.14
Detent Torque, Max (mNm)
Detent Torque, Max (oz-in)
Rotor Inertia (kgm²10^-7)
Rotor Inertia (oz-in-sec²10^-6)
Nominal Voltage (Volt)
Optimization (rpm)
No-Load Speed (rpm)
No-Load Current (mA)
Max continuous mechanical power (@ 25°C)
Max continuous Current (A)
Max Continuous Torque (mNm)
Max Continuous Torque (oz-in)
Terminal Resistance (W)
Output Power (W)
Stall Torque (oz-in)
Stall Torque (mNm)
Efficiency (%)
Speeds up to (rpm)
Torque up to (oz-in)
Torque up to (mNm)
Current up to (thermal limits)
Torque Constant (mNm/A)
Torque Constant (oz-in/A)
Motor Regulation R/k² (10³/Nms)
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 (onz-in)
Friction Torque (mNm)
Rotor Inductance (mH)
Mechanical Time Constant (ms)
Thermal Time Constant (C/W)
Absolute accuracy 2 ph. On, Full step mode (degree)
Ambient Temperature Range, Operating (°C)
Ambient Temperature Range, Operating (°F)
Rotor Operating Temperature Range (°C)
Rotor Operating Temperature Range (°F)
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)
Shaft Load Max Axial (lb)
Shaft Load Max Axial (N)
Shaft Load Max Radial (lb)
Shaft Load Max Radial (N)
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-energized){%|%}N 20.9 20.9 20.9 20.9
Min. Holding Force @ 0.001" (0.0254 mm) / Step (Un-energized){%|%}oz 75.0 75.0 75.0 75.0
Min. Holding Force @ 0.002" (0.0508 mm) / Step (Un-energized){%|%}N 11.1 11.1 11.1 11.1
Min. Holding Force @ 0.002" (0.0508 mm) / Step (Un-energized){%|%}oz 40.0 40.0 40.0 40.0
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-energized){%|%}N 2.8 2.8 2.8 2.8
Min. Holding Force @ 0.004" (0.1016 mm) / Step (Un-energized){%|%}oz 10.0 10.0 10.0 10.0
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 30.60 20.90 30.60 20.90
Min. Holding Force @ rated current @ .001" (0.0254 mm) / Step{%|%}oz 110.00 75.00 110.00 75.00
Min. Holding Force @ rated current @ .002" (0.058 mm) / Step{%|%}N 20.90 13.90 20.90 13.90
Min. Holding Force @ rated current @ .002" (0.058 mm) / Step{%|%}oz 75.00 50.00 75.00 50.00
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 11.10 8.30 11.10 8.30
Min. Holding Force @ rated current @ .004" (0.1016 mm) / Step{%|%}oz 40.00 30.00 40.00 30.00
Stroke Length, Typ{%|%}mm 15.0 15.0 15.0 15.0
Stroke Length, Typ{%|%}in 0.6 0.6 0.6 0.6
Steps per Revolution 24 24 24 24
Ambient temperature range, operating{%|%}°C -20 to +70 -20 to +70 -20 to +70 -20 to +70
Ambient temperature range, operating{%|%}°F -4 to +158 -4 to +158 -4 to +158 -4 to +158
Maximum Coil Temperature{%|%}°F 266 266 266 266
Maximum Coil Temperature{%|%}°C 130 130 130 130
Bearing Type Ball Bearing Ball Bearing Ball Bearing Ball Bearing
Insulation Resistance at 500 VDC{%|%}Mohms 20 20 20 20
Dielectric Withstanding Voltage{%|%}VAC 650 for 2 seconds 650 for 2 seconds 650 for 2 seconds 650 for 2 seconds
Number of lines available
Output signal
Supply Current - maxium (mA)
Supply Current - stand-by (μA)
Supply Current - typical (mA)
Supply Voltage (V)
Direction of rotation ( = / ≠)
Max. Recommended Input Speed (rpm)
Number of gear stages
Number of lines available
Thermal Resistance (C/W)
Natural Resonance Frequency @nominal current (Hz)
Electrical time constant (ms)
Angular Acceleration (nominal current)
Radial Shaft Play (µm)
Axial Shaft Play (µm)
Max Radial Shaft Load (oz)
Max Radial Shaft Load (N)
Max Axial Shaft Load (oz)
Max Axial Shaft Load (N)
Weight{%|%}g 25.0 25.0 25.0 25.0
Weight{%|%}oz 0.88 0.88 0.88 0.88
Leadwire AWG 28, UL 1429 AWG 28, UL 1429 AWG 28, UL 1429 AWG 28, UL 1429
Type of encoder
Power rate, nominal current (kW/s)
Step Angle ± 1 Step ± 1 Step ± 1 Step ± 1 Step
Input Power (W) 2.50 2.50 2.50 2.50
Stepper Type
Document Technology Document Type Language File Type
20DAM-K drawing Linear Stepper Actuator DXF Drawing  
20DAM-K Specification Sheet Linear Stepper Actuator Specification Page  
20DAM-K 3D Drawing Linear Stepper Actuator 3D  
About Stepper Linear Actuators (brochure) Linear Stepper Actuator Literature  
Stepper Linear Actuator Speed vs. Torque Curves specifications Linear Stepper Actuator Specification Page  
Miniature Motors for Automated Solutions (brochure) Literature