Pirelli Tyre S.p.a.

Politecnico Di Torino

Fabio Freschi

Federico Mancosu

Massimo Brusarosco

Elvio Bonisoli

Stefano Tornincasa

Paolo Guglielmi

Maurizio Repetto

Vincenzo Cirimele

Sandro Moos

A capacitive element is manufactured by using the multilayer printed circuit board technology. The body of the element includes a layer of dielectric material interposed between two layers of conductive material arranged on opposite sides of the layer of dielectric material. Each layer of conductive material is in turn covered, on its free side, with an external covering layer. The material for making the layer of dielectric material is chosen among materials having: &#x2014;a dielectric permeability &#x3b5;&#x3e;1, &#x2014;a dielectric rigidity k&#x3e;100 kV/mm, and &#x2014;a loss figure Df&#x2264;0.002. Furthermore, the dimensions of the layer of dielectric material are greater than the dimensions of the layers of conductive material, so as to limit the edge effects that might cause discharge phenomena and make the capacitive element flexible.

Capacitor for resonant circuits in power applications

A method and system for generating electric energy in a tire includes a device including a housing that extends according to a longitudinal axis X, at least one electrical winding, a magnet movable within the housing along the longitudinal axis, and a force providing element positioned at at least one of two opposite ends of the housing, which is adapted to exert on the magnet a force along said longitudinal axis. The device is fixed on a crown portion of the tire; the tire is rotated on a rolling surface so as to determine variations of forces that act on the device every time the device passes, due to the rolling of the tire, at a footprint of the tire; the force exerted by the force providing element and the variations of forces along the longitudinal axis are exploited so as to cause variations of the magnet position with respect to the at least one electrical winding; and the electric energy generated across the at least one electrical winding as a consequence of the variations of the position of the magnet with respect to the electrical winding is collected.

Method for generating electric energy in a tire

Growing community of inventors

Turin, Italy

Fabio Freschi