PA-R-205-4 rotary servo actuator

The PA-R-205-4 is a programmable rotary servo actuator from Pegasus Actuators, a compact DC-motor rotary actuator with contactless angle sensing for industrial and remote-controlled applications that need high reliability and a long service life.

The drive combines a DC motor with a neodymium magnet, a hardened steel spur-gear train on six ball races and a digital, programmable control board with differential analog sensor feedback. The output shaft is available as a rigid version or with the optional PA-SC overload protection. Position is measured with a contactless angle sensor, so there is no wiper to wear, and the standard travel angle is plus or minus 90°, with other angles offered on request. For flight-control, valve or gimbal duties, the rotary output moves a control surface, lever or mechanism directly.

The main figures are a continuous torque of 80 Ncm and a maximum torque above 200 Ncm. The continuous value is the load the actuator can hold or drive without exceeding its thermal limit, while the maximum value is the short-term peak for transient loads. The no-load speed is 255 °/s at 12 V DC and 245 °/s at 24 V DC, and the operating voltage is 6, 12 or 24 V DC according to the version ordered. The mass is 130 g, which is relevant where several actuators are fitted to the same aircraft.

For integration, the standard signal is a PWM signal at TTL level. Options are a differential PWM signal through an RS485 transceiver and an RS485 data protocol, and the board also provides analog feedback. The electrical connection can be a DE9 connector, a Glenair 801 connector or a cable pigtail, and the pigtail version with a Tyco MTA100 connector needs an adapter to reach the PA-Control 2 programming tool. The PA-Control 2 tool, with its adapters and cables, is used to set the actuator parameters. The aluminium case is water and dust protected to IP67 and has solid four-point horizontal and vertical fixing. An installation frame, the PA-IF-205-4-01, and levers are offered as accessories, and the maker provides datasheets, dimensional drawings for each connector option and performance graphs at 12 V and 24 V.

The only certification stated is the IP67 protection rating of the housing.

Typical applications are control-surface and flap actuation on unmanned aircraft, throttle, valve and mechanism positioning, camera and sensor pointing, and other industrial or remote-controlled systems where a small, sealed servo with a defined torque and angle is required.