Small electromechanical transducer, in particular a timepiece generator

Abstract

The invention relates to a smal electromechanical transducer, in particular a timepiece generator. The electromechanical transducer includes a rotor and two coil, the rotor being 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 secondcentral 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 include N tongues, where N is a number greater than one (N>1), which extend radially 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 in a first geometrical plane (26) 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 are located respectively opposite the N tonguesof the third part whereas the N second tongues of said second part are located opposite the N tongues of the first part. The two coils are 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.

Description

technical field [0001] The invention relates to an electromechanical sensor consisting of a rotor having a plurality of magnetic poles and at least one planar coil (relatively low in height) arranged so that when the rotor rotates, the magnetic poles of the rotor pass through all opposing said at least one coil. [0002] In particular, the electromechanical sensor defines a clock generator, ie a generator of small size or a magnetoelectric microgenerator. [0003] In particular, the clock generator according to the invention is used to incorporate a clock operation of the type disclosed in particular in EP Patent No. 239820 or 679968. Background technique [0004] A generator of the above-mentioned type with a multi-pole rotor is disclosed in German utility model DE 1811389 (U). This generator comprises a rotor consisting of a central shaft carrying two rims made of magnetic material, on the periphery of which are arranged permanent magnets of alternating polarity, six per...

AI Technical Summary

Problems solved by technology

However, this generator has several major disadvantages

First, it's relatively complex and troublesome

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