Linear actuators
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Modular Test bed for Performance Assessment of Piezoelectric Stick-Slip Actuators
19 June 2023
Stepping piezoelectric actuators based on the stick-slip effect inherently make use of a friction contact between stator and rotor. This contact defines not only the actuator’s performance but also is prone to wear and tear. For broad use, the actuator has to be able to perform around 1 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 friction partners, a dedicated test-bed for a LSPA30µXS motor by Cedrat Technologies has been set up.
Module Stepping Piezoelectric Actuator: A versatil way of micro-positioning actuation
10 January 2016
Stepping Piezoelectric Actuators (SPA’s) – based on the Piezoelectric Friction-Inertial Actuation (PFIA) principle – are made from Cedrat Technologies Amplified Piezoelectric Actuators (APA). They use the stickslip principle to couple high resolution positioning (cm) and low volume (10cm), allowing easier multi-DoF mechanism developments and miniaturization possibilities – is presented. Results obtained on three innovative engineering models – linear long stroke, rotary and three-DoF actuators – are presented, giving the reader actual benefits of this concept and allow addressing new applications such as consumer goods and medical devices.
Moving Iron Controllable Actuator : Performances in close loop control
19 June 2023
Moving iron controllable actuator (MICA) is a highly controllable Actuator. It has a robust mobile part with elastic guiding for a long life. The article presents the performances of the MICA when it is driven in a closed loop and shows impressive results achieved by IDEKO on a SOLARUCE milling machine.
MRF actuator for high force locking and damping applications
12 January 2010
The MRF actuators are new electromechanical components using Magneto Rheological Fluids (MRF). These smart fluids are characterized by their ability to change their rheological properties versus applied magnetic field. They can switch from a liquid to an almost solid body. This effect is reversible and operates within a few milliseconds. MRF are used to create controllable dampers, smart shock absorbers or brakes. After having developed several MRF actuators with an original characteristic (presenting a blocking force at rest), Cedrat Technologies was asked to develop a very challenging new MRF damper which goal can be summed up with a few words: “small size and high force”.
MRF actuators
7 January 2008
The MRF Actuators is a new electromechanical component using Magneto Rheological Fluids (MRF). The benefit of these smart fluids is their capability to alter their rheological properties – their viscosity in particular – compared to applied magnetic field.
MRI compliant micro-motors for medical and biomedical applications
19 June 2023
The performances offered by Magnetics Resonance Imaging (MRI) are widely recognized and used by practitioners. Mainly used for diagnostic issues, MRI becomes more and more an interventional tool in image-assisted classic or robotic surgery. However, constraints imposed by the MRI strong magnetic field and strong magnetic gradients in terms of material and architecture are often obstacles to MRI guided robotics. Designers have to deal with the few choices offered to them to build a robot which will be able to respond to severe specifications, in terms of space limitations, magnetic field sensitivity and image impact. Piezoelectric micro-motors are good candidates to fulfil these requirements in several fields of applications.