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.
Click on the link above to download the white paper.
Pin pullers are used to hold, lock or secure deployable or moving parts on spacecrafts during their launching. These ‘one shot’ actuators used to be based on explosive charges.
Tuned mass dampers are simple and efficient devices for the suppression of machine tool chatter, which is one of the principal effects limiting productivity in many machining processes. However, their effectiveness depends on a proper tuning of the damper dynamics to the dynamics of the machine. This involves the dynamic characterisation of the machining process, in order to identify the critical resonance frequency.
This white paper focuses on a bistable harvester designed and invented by the SYMME laboratory using amplified piezoelectric actuator (APA) technology and the industrial know-how of Cedrat Technologies.
White paper: active cardiac stabiliser — first in-vivo experiments using a robotised device download
Off-pump coronary artery bypass grafting (CABG) is still today a technically difficult procedure. In fact, the mechanical stabilisers used to locally suppress the heart excursion have been demonstrated to exhibit significant residual motion. Cedrat Technologies proposes a novel active stabiliser that is able to compensate for this residual motion.
The amplified piezoelectric actuator (APA) integrating a mechanical amplifier can be interesting where the efficiency of the standard actuators is poor. In this paper from Cedrat Technologies, the electrical harvesting characteristics of the APA in a proof mass configuration is studied.