DA 22 rotary actuation product

The DA 22 is a rotary actuator (servo actuator) made by Volz for the control surfaces and mechanisms of uncrewed aircraft. It converts a PWM or RS-485 command into angular movement of an output shaft, and it is built in a case 22 mm wide for platforms where space and mass are limited. It is offered in a short case of 51 mm and a long case of 71 mm, the long one giving more continuous torque.

The figures depend on the variant. The DA 22-12-2615 (short, 12 V rated) has a rated torque of 0.8 Nm, a peak torque of 1.6 Nm, a rated speed of 120 degrees per second, 210 degrees per second at no load, a rated current of 0.4 A and a peak current of 0.8 A. The DA 22-12-4112 (long, 12 V) gives 1.2 Nm rated and 3 Nm peak torque, 180 degrees per second rated speed, and 0.75 A rated and 1.7 A peak current. The 28 V variants are the DA 22-30-2630, with 0.7 Nm rated and 1.5 Nm peak torque, and the DA 22-30-4128, with 1.8 Nm rated and 3.0 Nm peak torque. The supply range of the family is 10 to 30 V. For an integrator, rated torque is what the actuator holds continuously, while peak torque and peak current set the short-term load the supply must handle, for example at the start of a movement against air load.

The case is CNC machined from saltwater-resistant aluminum, meets IP67 for dust and water resistance, and gives EMI/RFI shielding. All variants have an all-steel gear train, with the ISS gear protection system as an option. The actuators are fully programmable, including motor overload protection and a fail-safe position that is taken when the PWM command signal is lost.

For integration, the interface is PWM, with RS-485 as an option. The connector is an integrated M8 round male connector, with a MIL-specified connector or an integrated cable with a screwed cable gland as alternatives. Integrated lug mounts allow horizontal and vertical installation. Further options are an extended travel angle up to 330 degrees, a position feedback device and customized cases. Volz supplies a datasheet, STEP files and, on request, a MATLAB Simulink model.

Volz names ailerons and flaps of smaller UAVs for the short version, and flaps, control surfaces and undercarriage retraction on fixed-wing aircraft for the long version.