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POLYMERS AND PIEZOELECTRIC MATERIALS FOR ULTRASONIC MOTORS

Objective


The main achievements and results of the project are listed below:
1. Due to the present state of the art, the output mechanical power is limited for industrial applications below 20 watts.
2. Finite element modelling including viscoelastic and dielectric losses has been used for stator design optimization. A new temporal approach has been fully implemented in the scope of the project to simulate the unilateral stator-rotor contact. Transient phenomena have been taking into account. This software tool enables the designer to optimize the contact surface and the pressure between stator and rotor for the best operating conditions.
3. Stator manufacturing conditions have been analysed and characterized.
4. New friction layers have been applied on reference piezomotor, characterized and tested on full scale conditions. Some materials and process methods have been given very good results to improve drastically the mechanical output power. In comparison with the former state of the art, an increase of 300% has been observed. Life duration has been enhanced in parallel.
5. Different electronic suppliers and drivers have been designed and tested. This study emphasized the excellent capability of the high precision positioning of the piezomotor (< 0,01 ) and the very high flexibility of the driving possibilities (voltage, frequency, phase). A scale down size low cost electronic control unit has been developped for automotive applications.
6. New and present hard piezomaterials have been investigated. This study led that piezomaterial characteristics are of very high importance to increase output mechanical power and efficiency. Different materials have been realized and tested under actual operating conditions. Even in the same family of product, poling conditions, process method, high electrical field, temperature effect, bonding conditions impact strongly on the final performances.
7. The three piezomotor applications have been prototyped and tested. All the prototypes complied successfully with the requirements.
The project detailed in this proposal is aimed at the design, development and demonstration of linear and rotary piezoelectric motor. This will involve significant innovative approaches to the design of actuators presenting high torque for a low power, good self maintain torque and low acoustic noise.

Tow end users industries are part of the consortium to keep the project coherent with the market needs. To achieve the technical, a scientific team has been gathered to address each diffuclt point.

TECHSONIC will be en charge of the numerical simulations and the design of the motors.

STETTNER will focus on the piezoceramic improvement.

The tribology aspect and the coupling between the stator and rotor will be addressed by ARMINES.

The polymer formulation to ensure optimal motor performances will be done by THOMSON-SINTRA ASM.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

TECHSONIC
Address
Route Des Alisiers Zac Des 3 Moulins
06600 Antibes
France

Participants (5)

ASSOCIATION POUR LA RECHERCHE ET LE DEVELOPPEMENT DES METHODES ET PROCESSUS INDUSTRIELS
France
Address
Avenue Claude Daunesse Cnrs Ura 1374
06565 Valbonne
Magneti Marelli SpA
Italy
Address
Viale A Borletti 61-63
20011 Milano
STETTNER GMBH & CO
Germany
Address
Am Winkelsteig 1
8560 Lauf
Societá Gf Galileo Sma Srl
Italy
Address
Via Albert Einstein 35
50013 Campi Bisenzio
THOMSON SINTRA
France
Address
525 Route Des Dolines Sophia Antipolis
06561 Valbonne