Mechanical design of a non-linear resonant receiver for electrodynamic wireless energy transfer

Period, duration

march - july 2024

Profile required

M2 or final-year engineering student in Mechanics, Mechatronics or Applied Physics

Gratuity

4.05/h (standard)

Location

Annecy-le-vieux ; Maison de la mécatronique ; Symme laboratory

Subject

Context:
In many applications, deploying cables and using batteries to power sensors can be particularly complex. When it comes to powering biomedical systems in the human body (e.g. pacemakers, optogenetic devices, glucose sensors, etc.), battery replacement is a costly, complex and potentially dangerous surgical procedure.
To replace batteries for powering these in-vivo biomedical systems, one promising solution is to transfer energy wirelessly to a receiver placed inside the human body. To transfer energy safely and efficiently through the human body (which is mostly made up of water), it is preferable to use low-frequency magnetic waves. To this end, an original low-frequency energy transfer system has been developed at the SYMME laboratory (Annecy) in collaboration with CEA-LETI (Grenoble).

A transmitter (placed outside the human body) consisting of a large coil is powered by a low-frequency AC voltage source. The alternating current flowing through the coil generates a low-frequency alternating magnetic field. This alternating field causes a magnet attached to a beam to move at the level of the receiver placed in the human body. The beam begins to oscillate, deforming a piezoelectric material bonded to it. The deformation of the piezoelectric material generates an alternating voltage at its terminals, which can be rectified and conditioned to charge a capacitor powering a glucose sensor, for example.

Required work:
The aim of the internship is to study the dimensioning and mechanical design of an optimized receiver for wireless energy transfer (also known as an electromechanical antenna). The idea would be to explore original dimensioning, based on non-linear resonators, so as to be able to operate the resonator at very low frequencies while minimizing its volume and maximizing the transmitted power. The trainee's work would be broken down as follows:
- Reviewing the literature on the subject of electrodynamic wireless power transmission and understanding the models and application constraints. [10%]
- Simulation study (Matlab/Simulink) of the use of a nonlinear receiver for wireless energy transfer. Exploration of exotic nonlinear behaviors. [30%]
- Dimensioning of the receiver, and finite element simulation (COMSOL). The receiver could, for example, be based on a bistable resonant system based on buckled beams. [25%]
- Design (SolidEdge) of the receiver drawings, with a view to its manufacture, which will be subcontracted. [20%]
- Experimental validation of the receiver, on a laboratory test bench dedicated to wireless energy transfer. [15%]

Depending on the progress of the internship, a presentation at a scientific conference or the writing of a scientific article may be envisaged. This internship is part of the preparatory work for a thesis to be launched in September/October 2024, financed by the ANR.

Profile required:
Final-year Master's or engineering student in mechanics, mechatronics or applied physics, with an interest in a subject combining mechanical CAD, nonlinear dynamics, energy conversion, and multiphysics (magnetic/mechanical/electrical) systems. Writing skills and a good level of English are also expected. Knowledge of scientific computing software (Matlab/Simulink/Python), finite element simulation software (Ansys/Comsol) and/or mechanical CAD software would be a plus.

Some references on the subject:
-V.R. Challa, J.O. Mur-Miranda, and D.P. Arnold, "Wireless power transmission to an electromechanical receiver using low-frequency magnetic fields," Smart Materials and Structures, 21, 2012.
-A. Ameye, N. Garraud, P. Gasnier, D. Gibus and A. Badel, "Highly coupled hybrid transduction for low-frequency electrodynamic wireless power transfer," 2021 PowerMEMS, United Kingdom, 2021.
-A. Benhemou et al, "Design approach for post-buckled beams in bistable piezoelectric energy harvesters," 2022 Wireless Power Week, France, 2022.

 

Contact

adrien.morel
@univ-smb.fr

Project team

Adrien MOREL, teacher-researcher POLYTECH A-C / SYMME
David GIBUS, teacher-researcher POLYTECH A-C / SYMME
Ludovic CHARLEUX, teacher-researcher POLYTECH A-C / SYMME
Adrien BADEL, teacher-researcher POLYTECH A-C / SYMME