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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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.
White paper: a bistable piezoelectric harvester for wideband mechanical frequency excitation download
Embedded systems are increasingly used in industrial applications. The energy supply is a key point for the development of such systems. Solutions based on battery have limited lifetime and the power supplies through wires are not always appropriate and easy to install. Furthermore, the battery recycling is complex and an expensive process. This paper focuses on a bistable harvester designed and invented by SYMME using APA technology.
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This data sheet presents product and warranty information regarding piezoelectric optical mechanisms from Cedrat Technologies.