Patent ID: 8179012
Filing Date: 2012-05-15
Classification: G04C,H02K

Abstract:
1. An electromechanical transducer formed of a rotor and at least one coil, wherein the rotor is formed of first, second and third parts made of magnetic material with respectively first, second and third superposed central zones, a first, axially polarised, bipolar magnet being arranged between the first and second central zones and a second bipolar magnet axially polarised in an opposite direction to that of the first magnet being arranged between the second and third central zones, the first and third parts each including N tongues, where N is a number greater than one, which extend radially and regularly from the central zone and the second part including 2N tongues, of which N first tongues are folded such that their respective end zones are arranged approximately in a first geometrical plane in which the tongues of said first part are located, and of which N second tongues are folded such that their respective end zones are arranged approximately in a second geometrical plane in which the tongues of said third part are located, the N first tongues of the second part being located respectively opposite the N tongues of the third part and the N second tongues of said second part being located opposite the N tongues of the first part, said at least one coil being located between the first and second geometrical planes of the rotor such that, when the rotor is rotating, the end zones of the rotor tongues pass opposite said at least one coil.