Solar Array Drive Assemblies

Moog has over 40 years of experience with solar array drive assemblies (SADA), for both Earth orbit and planetary missions. The solar power application is one of the most established for Moog actuators and biaxial gimbals.

Type 1 SADA

The Type 1 Solar Array Drive Assembly offers a minimum weight, minimum power solution for positioning solar array panels at the lower end of the size/power spectrum. Continuous rotation of the solar array is facilitated by the integration of a slip ring assembly on the output of the actuator, and the rear accessory section of the Type 1 actuator is available for a position feedback device-potentiometer or encoder.

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Type 2 SADA

The single axis Type 2 Solar Array Drive Assembly (SADA) is based on the Type 2 Rotary Incremental Actuator. The standard actuator has been produced with numerous design variations to meet mission requirements for many applications. The features that vary are interface parameters and power transfer requirements. All of the listed Type 2 SADA designs are configured with harmonic drive gear sets, potentiometers for position sensing, and a slip ring assembly for power and signal transfer. Key specification parameters for a typical qualified unit are shown in the table below. The Type 2 SADA easily interfaces with the Moog 2 or 4 channel Electronic Control Unit for a complete system solution.

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Type 3/5 SADA

The single axis Type 3/5 Solar Array Drive Assembly (SADA) is based on the Type 3 Rotary Incremental Actuator with a Type 5 sized Harmonic Drive gear transmission and output duplex pair. This standard SADA has varied over many applications to meet mission requirements. Generally, the items that tend to vary are interface parameters and power transfer requirements. All of the represented Type 3/5 SADA designs are configured with Harmonic Drive gear sets, potentiometers for position sensing and a slip ring assembly for power transfer.

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Eddy Current Damper

The Eddy Current Damper is a rate-limiting device that has been successfully applied in solar array and antenna deployment, boom deployment, backup release mechanisms and door/cover deployments. The damper has a proven record of long life in space, exhibiting smooth operation and excellent thermal stability.

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