Ring type actuators are based on an open-center cylindrical design. Compared with stack type actuators, ring actuators have a higher bending stability, better heat management efficiency and allow access to the system’s axis. Given the same volume of PZT material, a ring actuator has a larger total diameter, which results in an increase in stability against bending and buckling forces applied to the actuator. Their overall larger surface also removes heat quicker from the system, which allows them to run at much higher frequencies than stack type actuators without overheating. The hpower ring series is offered with or without preload, and with or without optional casing.

Our ring actuators can achieve a motion range of up to 130µm, while generating maximum forces of up to 35kN.

The hpower rings can be customized with low temperature modification, thermostability and cooling options and even an axial cable exit, giving you more freedom and flexibility with your application design.

Series RA ring actuators consist of a large number of contacted ceramic discs. Compared with a tube actuator, the ring actuator reaches a higher stiffness and the expansion is twice as high.

Series RA piezo actuators are encased, and also include a mechanical pre-load so they can be used in dynamic applications.

Series RA actuators are available for open-loop systems, and closed-loop (strain gauge) systems.

Please ask for a screwing top plate for easy mounting of mirrors.

Series R ring actuators consist of a large number of contacted ceramic discs. Compared with a tube actuator, the ring actuator reaches a higher stiffness and the expansion is twice as high.

Series R piezo actuators are without casing, and without a pre-load. They are only connected at the ceramic top and ground plate. These ring actuators (without a pre-load) should not be used in dynamic applications.

Series R actuators are for open-loop systems only.

Please ask for a screwing top plate for easy mounting of mirrors.