DTA - Rotary Actuators product range

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The highly vertical integration of activities involved in the design and manufacture of DTA actuators allows SENER Aeroespacial to offer its clients the option to adapt the products to  their specifications with a short turnaround time.

All design activities, including those for the SUM electric motors, are done by SENER Aeroespacial engineers, aided by the most modern CAD/CAE tools in the market. SENER Aeroespacial also integrates its products in one of its many ISO7 Clean Rooms, in keeping with the highest quality standards in the industry.

Each DTA actuator that is manufactured undergoes a battery of functional and environmental tests to ensure it will operate correctly during its life cycle in the extreme outer space conditions.


The DTA actuators are available in different sizes and share a modular design philosophy that relies on the following, easily modifiable components:

  • Stepper motor
  • Reduction stage (harmonic, planetary or Wolfrom gear)
  • Position sensors

The products presented here can be adapted to specific mission requirements for a nonrecurring minor cost. However, the client, when selecting one of the configurations presented here, benefits from all the design and verification work already done, which lowers costs and delivery times.

SENER Aeroespacial's experience in DTA actuators

Over its 50+ years of experience in the space sector, SENER has acquired the knowledge and abilities to specify and design rotary actuators.

This type of device is a key component in many of the over 275 flight units it has delivered. Inside these units, SENER’s actuators have already flown on the European Space Agency’s Sentinel-1, Sentinel-2 and GAIA missions.

These success stories led SENER to propose its solution to the space market and, with support from the European Space Agency, it started to develop its DTA family of products in 2014.

The range of DTA products consists of versatile components for a wide variety of applications:

  • Deployable radiators
  • Electric drive modules
  • Antenna reflectors with or without a tracking system
  • Antenna reflectors with a tracking system
  • Large, deployable structures
  • Reconfigurable appendages or payloads in on-board telecommunication platforms


Products Unit  DTA-12-100 DTA-12-120-1 DTA-6-200 DTA-4-200 DTA-4-300
Size mm 110 x 120 (diam.) 133 x 120 (diam.) 90 x 60 (diam.)  120x38 (diam.) d72 poti 154 x 38 (diam.)
Sensors mm Hall effect contactless Potentiometers Potentiometers Potentiometers none
Electrical motor   SUM-88-360 SUM-88-160 SUM-55-360 SUM-38-120-M SUM-36-120
Motor Step Angle Deg 1 2,25 1 3 3
Reduction Ratio   160:01:00 160:01:00 110:01:00 128:01:00 42:01:00
Range   Full rotation Full rotation Full rotation
(Potentiometers 270º)
Full rotation
(Potentiometers 270º)
Full rotation
Resolution  Deg 0,00625 0.014 0.009 0.023 0,071
Position accuracy Deg < 0,01 0.005 +/- 0.02 TBC +/- 0.03 TBC +/- 0.03 TBC
Repeatability Deg < 0,01 0.0021 - - -
Torsional Stiffness Nm/rad 15,000 ON/OFF @ 7.5
18,500 ON/OFF @ 25
28,500 ON @ 50
15,000 ON/OFF @ 7.5
18,500 ON/OFF @ 25
28,500 ON @ 50
3,200 1,200 1,600
Shaft Load Capability Axia  N > 10,500 > 10,500 - - -
Shaft Load Cap. Transverse  N > 8,500 > 8,500 2,400 - -
Shaft Load Capability Moment Nm 277 277 - - -
Unpowered holding torque
Nm > 25 > 25 5 - 3,75
Powered holding torque Nm > 100 > 135 20   19,6
Running torque Nm > 60 > 60 > 20   10,1 max
Total Assembly Weight Kg 2 2,2 0,8 0,7 0,6
Thermal range: Operating ºC –45 / +105 –45 / +105 –45 / +105 –45 /+105 –45 /+105
Technology Research Level (TRL)   8 8 7 7 6


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