Model HT1 Rotary Incremental Actuator

The Moog Type HT-1 Rotary Incremental Actuator is a new addition to the rotary actuator product line. It is a compact, closely integrated coaxial design composed of a small size permanent magnet stepper motor driving the output stage through a gear transmission consisting of a larger size harmonic drive. The actuator provides relatively high holding and running torque for its size. This actuator is optimized for low weight and relatively high torsional stiffness. Co-axial nesting of the motor and transmission drive elements gives the unit a small profile geometry. Nested new technology using coarse and fine potentiometers provide high resolution, telemetry with noise-free operation.

 

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Key Features:

  • Compact and closely integrated coaxial design
  • Multi-stage speed reducer provides high gear ratio
  • Provides relatively high unpowered holding and running torque for its size
  • Optimized for low weight
  • Very fine output resolution
  • Zero backlash
  • High torsional stiffness

Specifications

 

Parameter Units        Basis                Data         

Output Step Angle

Degrees Standard 0.0039
Steps per Revolution Steps Standard 92160
Max. Output Step Rate Steps/sec (Deg/sec) Maximum 400 (1.56)
Backlash Degrees Maximum <0.01°
Operating Temperature Range °C Maximum -70 to +105
Torsional Stiffness lb-in/Rad Minimum 125,000
Bending Stiffness lb-in/Rad Minimum 250,000
Axial Stiffness lb/in Minimum 88,000
Radial Stiffness lb/in Minimum 80,000
Output Load Capability Axial lbf Nominal 370
Tranverse lbf Nominal 370
Moment Lb-in Nominal 430
Fine Potentiometer Primary/Redundant 352° min. Electrical Travel 1% Linearity
Coarse Potentiometer Non-Redundant 192° min. Electrical Travel .25%
Output Torque Lb-in Minimum 300
Unpowered Holding Torque Lb-in Minimum 300
Powered Holding Torque Lb-in Minimum >450
Power Watts Maximum 10
Total Assembly Weight Lb Maximum 2.10
Inertia Capability kg-m2 Minimum 800 kg-m2

Related Markets

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Spacecraft Technologies

Moog is a proven leader in components, subsystems, and systems for spacecraft of all sizes, from smallsats to GEO spacecraft. Moog has been successfully providing spacecraft controls, inspace propulsion, and major subsystems for science, military, and commercial operations for more than 60 years.