PA-R-135-4 rotary actuation product

The Pegasus PA-R-135-4 is a micro, low-profile rotary servo actuator from Pegasus Actuators for professional use in unmanned aircraft, robotics and industrial machines. It turns a PWM command into a controlled angular position of the output shaft, using a DC motor with neodymium magnets, a digital positioning controller and a magnetic angle sensor.

The mass is 65 g. Rated torque is 30 Ncm (42 oz-in) and stall torque is above 60 Ncm (84 oz-in), the latter limited by a slip clutch. A lock-out torque of 80 Ncm (113 oz-in) plus 20 percent is specified for the PA-SC overload protection. Gear train backlash is below 0.5 degrees and the electrical travel angle is plus or minus 45 degrees, while the mechanical travel is 360 degrees with no end stops. Speed at rated torque is 225 degrees per second at 6 VDC and 175 degrees per second at 12 and 24 VDC; no-load speed is 425 degrees per second at 6 VDC and 410 degrees per second at 12 and 24 VDC.

The actuator is offered for three supply voltages: 6 VDC (6 to 8 VDC), 12 VDC (8 to 16 VDC) and 24 VDC (18 to 32 VDC). Standby current is 20 mA. Short-time peak current is 1300 mA, 700 mA or 330 mA, and continuous stall current is 680 mA, 300 mA or 170 mA, for 6, 12 and 24 VDC respectively, limited by an overload protection circuit.

For integration, the standard input is a TTL-level PWM signal, with a differential PWM signal through an RS485 transceiver or an RS485 data protocol as options. The minimum detectable signal step is at most 0.25 microseconds and is adjustable. Position feedback is a differential analog signal of 0 to 5 V. The connection is a 30 cm pigtail without connector as standard, or a Gienair SuperFly series 881 seven-pin connector; length and connector can be specified by the customer.

The case is CNC-machined aluminium, bead blasted and anodized, and rated IP67 for water and dust, with a four-point vertical and three-point horizontal fixation. The gear train uses hardened steel spur gears with two ball races on the output shaft. Operating temperature is -40 to +60 degrees C, up to +100 degrees C on special request, and storage temperature is -40 to +70 degrees C. Vibration is tested to IEC 68-2-6 / EN 60068-2-6 and shock to IEC 68-2-32.

Typical applications are control surfaces and flaps, throttle and valve actuation, gimbal and payload mechanisms on UAVs, and other positioning tasks in harsh environments where a small, sealed servo actuator is needed.