White paper: the ultrasonic piezo drive for high-accuracy positioning
Cedrat Technologies S.Acontact supplier
‘The ultrasonic piezo drive: an innovative solution for high-accuracy positioning’
Piezo-electric motors have been successfully developed for various applications such as autofocus drives in camera lenses and handling equipment for semiconductor production. Their high speed and accurate positioning capability, combined with a favourable holding torque in unpowered condition, make piezo motors also very attractive for actuation purposes in spacecraft mechanisms. However, so far only a few studies have been reported considering their suitability for actual use in space. Piezo motors use a combination of piezo-electric and friction forces to generate a progressive motion of an output element. This white paper from Cedrat Technologies introduces a new concept of a versatile piezo motor driven at ultrasonic frequency, and it elaborates on a number of space-related issues such as the compatibility with the relevant mechanical and thermal environment. Furthermore, the possible implementation in different space mechanisms is discussed, with specific focus on miniaturised equipment as needed for small satellites.
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Stepping piezoelectric actuators based on the stick-slip effect inherently make use of a friction contact between stator and rotor. This contact defines the actuator’s performance but is prone to wear and tear. For broad use, the actuator has to be able to perform around one million strokes. To assess the actuator’s performance in terms of force, speed, mechanical output, electrical input and long-term stability under different load and environmental conditions, as well as different ...
According to Cedrat Technologies, future aeronautics are more likely to use electric actuators than hydraulic actuators. Existing amplified piezo actuators (APAs) with steel shells are good candidates. Lighter carbon shells are being developed to further increase their efficiency. For helicopter rotor blade applications this evolution is almost unavoidable, but it is also very interesting for other domains.
Developed in collaboration with Florent Capriani from EMBL, the FPS200M is made of two amplified piezo actuators (APA200Ms) facing each other with a special optical head.
This paper from Cedrat Technologies presents the development of the largest piezo actuator ever designed based on low-voltage PZT. This actuator is able to provide more than 20kN of force in dynamic operation (60kN in static operation). The purpose of low-frequency vibration generation is to improve the quality of parts production in the field of manufacturing and machining process.
Amplified piezoelectric actuators offer the advantage of large deformation (up to eight per cent) and large strokes. Because of a prestress applied to the piezo ceramics and an efficient mechanical amplifier, they can produce large strokes both in static and dynamic conditions including resonance. For these reasons, these actuators can be used for micro-positioning, structure shaping, structure active damping and more.