Rotating machines
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Inertial & Inchworm piezoelectric motors: Design and Motorization selection key aspects
14 June 2024
Piezoelectric motors have gained increasing prominence in various applications due to their unique capabilities and advantages. These motors are adapted for applications which require non-magnetic and radiation compatibility, high force/volume ratio, good unpowered stall force and low power consumption. Cedrat Technologies (CTEC) have developed inertial and inchworm motorization for a wide range of application such as Space, Defense and Nuclear. Each motorization solution has its own advantages and disadvantages which are discussed in this paper. Key aspect for the design and key element for the motorization selection are presented below.
Micromoteur et micro-actionneurs piezoélectriques de puissances
1 January 2002
The applications of piezoelectric actuators are spreading in various fields such as precise micro-positioning, shape control or vibration generation, control or damping.
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.
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.
Rotating piezo actuator for high accuracy positioning in space applications
7 January 2002
Piezo-electric motors have been successfully developed for various applications like 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.
3D ultrasonic imaging probes
1 January 2001
Implementation of 3D capabilities on ultrasonic imaging systems tantalizingly proves the high interest for this diagnosing modality. However, to become a clinical tool, 3D ultrasound has to spend further technological efforts in acquisition performance and probe size to deliver on the fly, quality volumetric images as well as current functionalities.
