Mechanical-electric energy converter and watch part comprising t

Details Mechanical-electric energy converter and watch part comprising t Mechanical-electric energy converter and watch part comprising t

1999-06-15

2000-03-21

Miska, Vit

Horology: time measuring systems or devices

Chronological

With supplemental power source

368204, G04B 100, G04L 300

Patent

active

060410221

DESCRIPTION:

BRIEF SUMMARY
The present invention has for its object a converter of mechanical energy into electrical energy and the timepieces using these converters.
Portable electric apparatus, as well as electronic quartz timepieces, use essentially, as an energy source, batteries or accumulators. The principal drawback of these latter is their limited lifetime. It is for this reason of interest to replace these electrical energy sources by a mechanical energy source and a converter for mechanical energy into electrical energy.
Converters for mechanical energy into electrical energy are known. European patent application 0 665 478 discloses an electronic watch comprising a toothed wheel (4) secured to an oscillating mass (8). The toothed wheel drives several rotors disposed at the periphery of a plate. In International patent application PCT 89/06833, there is described an electronic watch comprising an oscillating mass coupled with the rotor of a generator through a speed multiplying gear train.
The energy converters described in these mentioned patent applications have in common the following drawbacks: must be a substantial speed multiplication, which gives rise to consumption space and increase in the cost of the converter. which results in decrease of the overall output of the converter.
The object of the present invention is to overcome the mentioned drawbacks by providing a new type of converter as defined in claim 1.
The invention will be better understood from a reading of the following description, with reference to the accompanying drawings, in which:
FIG. 1 shows a first example of embodiment of the converter according to the invention.
FIG. 2 shows the respective positions of the rotor of the generator of FIG. 1 as a function of those of the toothed rotor;
FIG. 3 shows a second embodiment of the converter according to the invention;
FIG. 4 shows a first example of use of the converter according to the invention;
FIG. 5 shows a second embodiment of the converter according to the invention;
FIG. 6 shows the electromagnetic brake used in the example of FIG. 5.
FIG. 7 shows the device for measuring the mean speed of the transmission wheels.
FIG. 8 shows a third embodiment of the converter according to the invention .
FIG. 1 shows a first embodiment of the converter according to the invention. This converter has a toothed wheel 11 turning under the influence of a mechanical energy source, either an oscillating mass, or a coil spring. The toothed wheel 11 drives the pinion 12, secured to the rotor 13, of an electromagnetic generator. This rotor, constituted by a permanent cylindrical magnet, is disposed in an air gap of substantially cylindrical shape, provided in a stator of ferro-nickel material. The flux generated by the rotor is coupled with the winding 15 of the generator. On the cylindrical surface of the stator air gap, there are provided two semicircular openings 16a and 16b to give the rotor a magnetic reluctance couple.
FIG. 2 shows the respective positions of the rotor of the generator as a function of that of the toothed wheel 11. At the time t=T1, the pinion of the rotor of the generator is located between the teeth 1 and 2 of the toothed wheel, the latter exerting no couple on the rotor. The rotor, under the influence of the magnetic reluctance couple, is located on the axis R. At time t=T2, the toothed wheel 11, turning in the clockwise direction, drives the pinion of the rotor of the generator and spaces it by an angle .alpha.0 relative to its initial position. At time t=T3, the tooth 2 of the toothed rotor being no longer in engagement with the pinion of the rotor of the generator, the rotor disengages and oscillates about its rest position, which is to say the axis R, under the influence of the magnetic reluctance couple. Given the very low inertia of the rotor, this latter can attain very high angular speeds (an angular speed exceeding 600 rad/sec). The high frequency oscillating movement of the rotor permits obtaining, at the terminals of the winding 15 of the generator, a high level induced voltage.
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REFERENCES:
patent: 2791732 (1957-05-01), Jones
patent: 4091302 (1978-05-01), Yamashita
patent: 4156825 (1979-05-01), Kondo et al.
patent: 4242745 (1980-12-01), Mutrno
patent: 4644246 (1987-02-01), Knapen
patent: 4853580 (1989-08-01), Sula
patent: 4939707 (1990-07-01), Magao
patent: 5751091 (1998-05-01), Takahashi et al.

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