Rotary Actuators for space applications. DTA 1300 series.

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DTA 1301. Actuador rotatorio de altas prestaciones, alto par de retención, para aplicaciones espaciales
DTA 1301. Actuador rotatorio de altas prestaciones, alto par de retención, para aplicaciones espaciales
  • Country: Spain
  • Start date: --
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The DTA 1301 product has the same modular architecture and shares certain key components with the other qualified DTA products, achieving full product qualification incrementally over the results already obtained. The development activities were funded by means of the company's own R&D&i resources and with the support of ESA/CDTI through ARTES programs.

The DTA product family is 100% free of export restrictions.

Flight references:

This product is a direct evolution of the HDRA actuator, which has flown in the SAR deployment mechanism of the Sentinel-1 satellite and the Gaia Deployable Sunshield Assembly.


  • 2- or 4-phase electric stepper motor with redundant windings.
  • Reduction stage combining HD and planetary gear, delivering a 500:1 reduction ratio, excellent torque capacity and torsional stiffness.
  • Enhanced positioning accuracy and repeatability. Excellent angular resolution and high stiffness.


  • Deployable radiator actuation.
  • Actuation of large antennae and structures.

Chart of characteristics:

Motor Step Angle Deg  1
Reduction Ratio    > 500
Output Step Angle Deg  < 0.002
Shaft Load Capability Axial N  > 10000
Shaft Load Capability Transverse N  > 8000
Shaft Load Capability Moment Nm  > 250
Torsional stiffness Nm/rad  11000 @ zero load 
Detent Torque Nm  > 45 
Output Torque @ nom speed Nm  > 100 
 > 25
Total Assembly Weight (including harness) Kg  2.5

Power (full step)

 2 ph < 20 Wave
< 40 Full
 4 ph < 10
Thermal range: Operating ºC  -40 to +100



  • Use of waveguides or wiring routing through the central opening.
  • Use of different types of sensor (potentiometers, CAPS, etc.).
  • Available in biaxial gimbal configuration.
  • Electrical I/F by means of discrete wires or connectors.
  • Possibility of adding heaters to the outside or the inside of the device.

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