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Conference Papers Year : 2013

Autonomous dielectric elastomer generator using electret


Dielectric elastomers can work as a variable capacitor to convert mechanical energy such as human motion into electrical energy. Nevertheless, scavengers based on dielectric elastomers require a high voltage source to polarize them, which constitutes the major disadvantage of these transducers. We propose here to combine dielectric elastomer with an electret, providing a quasi-permanent potential, thus replacing the high voltage supply. Our new scavenger is fully autonomous, soft, lightweight and low cost. Our structure is made of a dielectric elastomer (Polypower from Danfoss) and an electret developing a potential of -1000V (Te on from Dupont). The transducer is designed speci cally to scavenge energy from human motion. Thus, it works on pure-shear mode with maximum strain of about 50% and it is textured in 3D form because electret is not deformable. The shape of the hybrid structure is critical to insure huge capacitance variation and thus higher scavenged energy. We present in this paper our process for the optimization of the 3D shape that leads us to the developpment and characterization of our rst prototype. From an appropriate electromechanical analytical model, an energy density of about 1.48mJ.g-1 is expected on an optimal electrical load. Our new autonomous dielectric generator can produce about 0.55mJ.g-1 on a resistive load, and can further be improved by enhancing the performance of dielectric elastomer such as dielectric permittivity or by increasing the electret potential.


Electric power
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Dates and versions

hal-00803650 , version 1 (22-03-2013)


  • HAL Id : hal-00803650 , version 1


Thanh Vu Cong, Claire Jean-Mistral, Alain Sylvestre. Autonomous dielectric elastomer generator using electret. SPIE Smart Structures 2013, Mar 2013, San Diego, United States. ⟨hal-00803650⟩
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