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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.
| Name | UNIT | RA 12/24 | RA 50/35 | RA 12/24 SG | RA 50/35 SG |
|---|---|---|---|---|---|
| Part # | - | P-401-10 | P-406-10 | P-401-11 | P-406-11 |
| Motion in Open-Loop (±10%)* | µm | 12 | 50 | – | – |
| Motion in Closed-Loop (±0.2%) | µm | – | – | 10 | 40 |
| Capacitance (±20%)** | µF | 2.9 | 24.0 | 2.9 | 24.0 |
| Stiffness | N/µm | 160 | 80 | 160 | 80 |
| Blocking force | N | 2000 | 4000 | 2000 | 4000 |
| Pre-load | N | 300 | 500 | 300 | 500 |
| Resolution in Open-Loop*** | nm | 0.03 | 0.1 | – | – |
| Resolution in Closed-Loop | nm | – | – | 0.5 | 2.0 |
| Length | mm | 36.5 | 70.5 | 36.5 | 70.5 |
| Outer Diameter (D2) | mm | 24 | 35 | 24 | 35 |
| Inner Diameter (D1) | mm | 9 | 14 | 9 | 14 |
*Typical value measured with an NV 40/1 CLE amplifier. **Typical value for small electrical field strength. ***Resolution limited only by amplifier and metrology noise.
Standard Series
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