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hpower Rings

Description

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.

Technical Data

(See Datasheet PDFs below this chart for the complete list of product variations)

4 Example ProductsUNITHPSt 1000/10-5/07HPSt 1000/25-15/100HPSt 1000/10-5/7 VS18HPSt 1000/35-25/100 VS45
Motionμm71007100
CapacitynF151800151800
StiffnessN/μm210160210160
Resonant FrequencykHz50103510
Dimensions – Lmm99024107
Outer Diametermm13401845

Series RA

Description

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.

Technical Data

(See Datasheet PDFs below this chart for the complete list of product variations)

4 Example ProductsUNITRA 12/24RA 50/35RA 12/24SGRA 50/35SG
Part #P-401-10P-406-10P-401-11P-406-11
Motion Open Loop (±10%)*μm1250
Motion Closed Loop (±0.2%)μm1040
Capacitance (±20%)**μF2.9242.924
StiffnessN/μm1608016080
Resolution Open Loop***nm0.030.1
Resolution Closed Loopnm0.52.0
Dimensions – Lengthmm36.570.536.570.5
Outer Diametermm24352435
*Typical value measured with an NV 40/1 CLE amplifier. **Typical value for small electrical field strength. ***The resolution is only limited by the noise of the power amplifier.

Series R

Description

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.

Technical Data

(See Datasheet PDFs below this chart for the complete list of product variations)

3 Example ProductsUNITR 12/14R 25/20R 50/20
Part #P-401-00P-404-00P-406-00
Motion Open Loop (±10%)*μm122550
Capacitance (±20%)**μF2.91224
StiffnessN/μm16016080
Resolution Open Loop***nm0.030.050.1
Dimensions – Heightmm13.52754
Outer Diametermm142020
*Typical value measured with an NV 40/1 CLE amplifier. **Typical value for small electrical field strength. ***The resolution is only limited by the noise of the power amplifier.