Electromechanical actuators have drawbacks such as backlash and overshoot, which can lead to slower move and settle times. Traditional electromechanical systems require up to 10 to 20 milliseconds to move and settle into position, while the DSM piezo systems require less than 5 milliseconds. Electromechanical systems also use a significant amount of power during hold maneuvers to maintain an electric field and, thereby, to hold position. The capacitive nature of the piezoelectric load means that the actuators do not use any power to hold position.

Its composition and features ensure that the actuator can withstand extremely low or high temperatures. For example, although a standard piezo material starts to lose its piezoelectric properties above 100°C, the material and electrical connections used in DSM’s design help it to operate reliably at up to 250°C.

Where it Stands

The most difficult part of building the technology was reducing the size of the system — the actuator, drive electronics, and sensor packaging size — to offer higher power density (power per unit mass) relative to electromagnetic systems. Simultaneously, DSM’s efforts have focused on increasing the technology’s Technology Readiness Level (TRL) for future insertion into MDA platforms. DSM is continuing to pursue its miniaturization process on several fronts, including material selection and system stiffness/ control analysis.

The company, which is focusing largely on the piezo system’s military and space-related applications, has also obtained additional funding from commercial sources to continue developing these technologies for related applications.

More Information

Click here for more information on Dynamic Structures and Materials, LLC. (Source: MDA TechUpdate, Missile Defense Agency, National Technology Transfer Center Washington Operations.)