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New Design of High Switching Power Amplifier for driving Piezoelectric Actuators in aeronautic applications
19 June 2023
Nowadays, piezoelectric actuators (PA) are used in fast power actuations and high power applications as requested in machine tools or helicopters flap applications. Regarding to the low power capability and high loss ratios of linear amplifiers, Switching Power Amplifiers (SA75X) is designed by Cedrat Technologies to drive piezoelectric actuators in such applications. The switching technique (up to 100 kHz) allows high current peaks required by impulse or by high frequency applications on large piezoelectric actuators (or actuators in parallel) and allows energy harvesting.
Mechanical structure with high force amplification ratio for low frequency piezoelectric harvester application
19 June 2023
A mechanical structure based on serial stacking of level arm has been designed in order to amplify the ingoing force of the the harvester system. The outgoing force is applied upon the smart material. The deformation of the mechanical structure is based on flexural pivots using four truncated circular collars. The last amplification is based on the APA® (Amplified Piezoelectric Actuator) shell and already patented solution by Cedrat Technologies. The force amplification structure has been designed upon the request of a small volume allocated (0.3 cm3) and low frequency resonance (20 Hz) harvester
MICA actuator: highly dynamic controllable magnetic actuators
19 June 2023
Moving Iron Controllable Actuator is a concept of linear magnetic actuator that is especially designed to respond to the need of highly dynamic controllable actuators. The article presents the specificity of the actuator compared to more classical magnetic actuator concepts. It points out the interest of its properties and describes technological issues it implies. A MICA prototype has been built and its main performances are given: 800N, 20A, with a size 160*200*150. The controllability of the actuator has been demonstrated by simulation using force characteristic of MICA. Finally, the prototype will be declined in a full range of magnetic actuators as products of Cedrat Technologies.
Micro stage XY25XS
19 June 2023
The XY25XS stage is an original micro positioning mechanism developed, built and marketed by CEDRAT TECHNOLOGIES. This mechanism relieds on the Amplified Piezo Actuators (APA) technology patented by CTEC
Micromotor based on film permanent magnets
19 June 2023
A design of a single phase step micro motor is presented. The rotor has been optimised to induce the greatest magnetic energy using film permanent magnets. A special study has been performed to select the most advantageous magnetisation direction and the structure has been chosen taking into account micro technologies characteristics and the present know-how available for realisation of prototypes. A scale 2 prototype has already been realised. Its special air gap tuning for film magnet test is presented, as well as first torque measurements.
Miniature piezo mechanisms for optical and space applications
19 June 2023
Piezoelectric actuators find their first applications in active space optics. The purpose of this paper is to describe the state of the art and some applications. Piezo actuators display attractive features for space applications, such as precise positioning, unlubricated, non magnetic and compact features, and low power consumption. However, piezo mechanisms cannot be considered separately from their driving and control electronic.
