| Abstract |
Piezoelectric mechanisms are more and more used in space applications requiring precise positioning
functions for scientific payloads or optical functions. Indeed, piezoelectric actuators are generally
deemed of being good candidates for driving and control compact mechanisms. They offer advantages
like:
· fine precision,
· low power consumption,
· fast time response,
· and easier implementation.
For the application of these new components, an adapted electronic must be used to obtain the
command of the actuators. The use of an unsuited driver can ruin the accuracy of the mechanism.
To comply with the space applications needs, the “FB-LA75 SPACE” has to comply with many
requirements besides the functional ones: space environment in terms of vibration, radiation and
thermal vacuum, but also in terms of quality of design and reliability.
After a brief recall about the original “Amplified Piezo Actuators” family and the qualified actuators
designed by Cedrat Technologies, a high accuracy driving electronic development is proposed in order
to obtain the full characteristics of the mechanism.
The study and the accuracy budget are also described: phase stability, thermal stability, noise budget.
The paper will conclude with:
· a discussion of these new performances,
· estimated capabilities for the future,
· application perspectives. |
