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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Technical article: a new rotating voice coil motor for Meteosat third-generation satellites download
The goal of this paper from Cedrat Technologies is to present the motor that meets the requirements of the Meteosat third-generation satellite system.
Multi-degree-of-freedom (DoF) mechanisms are widely required in micro or macro manipulation fields as well as in optronics functions. Commonly available mechanisms may be divided into two main categories. The first is industrial robots (serial or parallel). These offer a large range of motion in rotation and translation. Their resolution is usually limited in the sub-millimetre range.
Technical article: compact and efficient piezo actuation chain for aeronautical applications download
Many past and ongoing studies are focusing on the use of piezo-actuators for aeronautical applications. One of the trendiest topics is the use of such devices for active flow control in aircraft in order to reduce fuel consumption and noise. However, the implementation of such systems in aircraft suffers a lack of maturity with respect to aeronautical constraints, which are high efficiency, compactness and light weight.
This paper details a test bench design and the results obtained with CNES on two-piezo ceramics stacks from two distinct suppliers. Integration into dedicated cryo actuators is also proposed as well as the associated cryo performances. The use of such cryo-compatible actuators is detailed in a fine steering tip-tilt mechanism designed to reach very high resolution and stability for the ESA EChO space mission.
In this article, Cedrat Technologies presents the moving iron controllable actuator (MICA) and its characteristics under closed-loop control operations. MICA is a magnetic actuator with a high-density force, a low-mass moving part and the capability to inverse the force with the inversion of the current. The guiding is made of blades and thus avoids friction that would introduce hysteresis.