Rotary Incremental Actuators
Moog’s Rotary Incremental Actuator family provides a range of compact, closely integrated motion control units designed for precise positioning in demanding spacecraft applications. Each actuator combines a permanent magnet stepper motor with a high‑performance transmission, either a Harmonic Drive® speed reducer or a multi‑stage reduction system, to deliver high holding torque, zero backlash, and excellent torsional stiffness in a low‑profile package. Coaxial nesting of the motor and transmission elements enables efficient use of space, supports large‑capacity output bearings, and minimizes overall mass while maintaining high load capability.
Overview
Across the family, Moog offers actuator configurations optimized for different size, torque, and interface requirements, including the M8, Type 1, 2, 3, 5, Micro3 and HT‑1 family of products. These actuators share a common design philosophy emphasizing low weight, high stiffness, and reliable stepper‑motor performance. Optional features such as potentiometer or resolver position feedback and 2, 3 or 4-phase motor configurations allow tailoring to mission‑specific needs. With proven actuator heritage and consistent mechanical architecture, the Moog rotary incremental actuator family provides a scalable, flight‑ready solution for precision spacecraft mechanisms.
