FLYWHEEL GENERATOR WITH IMPROVED IGNITION PILOT DEVICE

Abstract: FLYWHEEL GENERATOR WITH IMPROVED IGNITION PILOT DEVICE, comprising a plurality of main coils (3) and at least one pilot coil of said ignition system (4) in a wheel-spoke type statoric unit round which a rotor with permanent NORTH-SOUTH means is destined to turn for the respective energizing of said coils, in which: the said statoric unit presents at least one pilot coil for the ignition system (4), moved sideways from the lying plane of said main coils (3); said rotor presents at least two anular bands of magnetic influence: - the first one being more extended (F) so as to activate the said main coils (3), - at least the second one being less extended (f) to activate said pilot coil (4).

Description: The subject of the present invention is a FLYWHEEL GENERATOR WITH IMPROVED IGNITION PILOT DEVICE. The invention has a special and convenient, although not exclusive, application for use in the sector of flywheel generators for internal combustion motors especially, although not exclusively, for vehicles with two and three wheels. In the present state of art it is known that in order to effect ignition in a regular and efficient manner, the following are used: - a stator comprising a wheel-spoke type, lamellar pack, on the spokes of which windings are made so as to form a plurality of windings; - a sector-type rotor of permanent magnets arranged in an anular form and corresponding to the respective number of windings to be energized; The above in order to realize: - a plurality of main coils (so as to charge ignition capacitor means, to charge the battery and power supply for vehicle services), prearranged radially on the same number of spokes or on chordal cores; - at least one pilot coil destined to control and regulate the moment and manner of said discharge of said ignition capacitor means. It is to be noted that the pilot coil is always the smallest and does not necessarily have to be placed in equiangular division with the others; this is also in order so as not to make the generator too bulky, and therefore it is usually placed between the two spokes of the main coils. Problems arise when it is necessary to adjust the position and dimensioning, as well as reaching the number of sparks per rev (number of polar pairs). Other problems also regard the necessity of at least the static balance (conditions of indifferent balance of rotor), and preferably of the dynamic balance (revolving balance, of axial nature too) in order to avoid oscillations and vibrations in the rotor-bearing axis. Other solutions foresee inter-spoke lamellar appendixes involving a pair of coils, energized in opposite ways, respectively from a NORTH polarity and a SOUTH one of two adjacent magnetic sectors utilized to energize the other coils (main coils). However, in this case too, although the solution solves many problems, it is complicated and expensive. The present invention, according to the characteristics given in the attached claims, solves the problem by: - shifting the pilot soil sideways on a band of rotary magnetic influence (f) which does not interest the said main coils (F); - determining an anular extension which corresponds to the rotoric magnetic means of energizing (f), arranged next to the side of the anular band involved in energizing said main coils (F). The advantages obtained with this innovation consist essentially in the fact that: - the number of pilotings, and therefore the number of ignitions per rev of the rotor, is freed from the number of the generator's polarities; - a considerable simplicity in construction is reached; - the rotor is more easily and safely balanced; - the pilot coil can be better regulated in the optimal position and dimensioned in a rational way, independently of construction constraints, both of the rotoric system and that of the statoric one. The permanent magnetic means of the rotoric system are advantageously realized in a plastoferrite ring, comprising: - a wide anular band (F) with the entire circumference sub-divided in a plurality of areas, magnetized alternatively NORTH-SOUTH, - at least one narrower, adjacent anular band (f), comprising at least one neutral arc and at least two sectors magnetized NORTH-SOUTH. This solution gives complete balance, not only static but also dynamic, as the plastoferrite is uniformly distributed in the rotor independently of the respective magnetization. The invention is hereafter explained in more detail with the help of drawings showing the preferential realization solutions, the execution details of which are not to be held as limiting, but only as examples. Figure 1 gives a front prospect of a first rotor with a plastoferrite, magnetic, energizing ring. Figure 1′ gives a front prospect of an alternative way of realizing the rotor by using several magnetic sectors, for example, in ceramic, opportunely removed or displaced to work on the level of the main coils on one side and on that of the secondary coil on the other. Figure 2 gives a view from above of the stator with the pilot coil out of axis in respect to the main coils, as per the invention. With reference to figure 1, it can be seen that with 2 is ndicated the rotoric containing casing, and that inside it there is a plastoferrite ring comprising, as per the invention, sectors which are magnetically activated from NORTH to SOUTH(1), a couple of which extend over the entire width of the plastoferrite ring whereas a neutral, that is to say, non-magnetized, semi-anular, lateral band (1′) extends beyond them. By coupling the rotor of Fig. 1 with the stator of Fig. 2, the main coils (3) will be energized by the magnetized sectors (1) of the wider, main energizing band (F), while the secondary, pilot coil of the ignition system (4) arranged, according to the invention, out of the revolving plane of magnetic influence (f), is energized in a completely independent way which is not tied to the said energizing sectors of the main coils (3) ... According to Figure 1′, instead of extending a corresponding NORTH-­ SOUTH magnetization laterally in the neutral, non-magnetized band (1′), magnet plates or sectors, for example, made of ceramic, will be arranged in such a way that at least a pair corresponding to the respective pilot coil (4) is displaced (1) or extended to a width greater than that of the other plates or other sectors destined to energize the main coils (3). It can be seen from Figure 2 that the pilot coil (4) is placed at the side in respect to the anular surface of magnetic influence (F) of the main coils (3), so as to be independently influenced by a band having adjacent magnetization (f).

Claims: 1. FLYWHEEL GENERATOR WITH IMPROVED IGNITION PILOT DEVICE, comprising a plurality of main coils (3) such as, for example, coils to charge the capacitor means for the ignition system, to charge the accumulators, to power the service systems, etc., and at least one pilot coil of said ignition system (4), in a wheel-spoke type statoric unit shaping, round which, a rotor having permanent NORTH-SOUTH magnetic means is destined to turn for the respective energizing of said coils, characterized by the fact that: - said statoric unit presents at least one pilot coil for the ignition system (4), shifted sideways out of the lying place of said main coils (3); - said rotor presents at least two anular bands of magnetic influence, - the first being more extended (F) so as to activate the said main coils (3), - at least the second one being less extended (f) so as to activate the said pilot coil (4). 2. FLYWHEEL GENERATOR WITH IMPROVED IGNITION PILOT DEVICE, as per claim 1, characterized by the fact that said anular bands of magnetic influence are realized in a plastoferrite ring having a plurality of sectors magnetized NORTH-SOUTH, of which: - a part extends for the entire width, equal to the sum of said bands of magnetic influence (F+f), and - a part extends for a lesser width, excluding the activation band (f) of said pilot coil (4). 3. FLYWHEEL GENERATOR WITH IMPROVED IGNITION PILOT DEVICE, as per claim 1, characterized by the fact that said anular bands of magnetic influence are realized by an anular arrangement of magnetic NORTH-­ SOUTH sectors, of which: - a part extends coplanarly to the anular width only of surface influence of said main coils; - a part extends for the entire width of magnetic influence of said pilot coil (f), and for a predominant part at least of the said main coils' (F) surface of influence. 4. FLYWHEEL GENERATOR WITH IMPROVED IGNITION PILOT DEVICE, as per claim 1, characterized by the fact that said anular bands of magnetic influence are realized by an anular arrangement of magnetic NORTH-­ SOUTH sectors of equal lateral extension, of which: - a part extends coplanarly, to the anular width only of said main coils' surface influence; - a part is shifted so as to exercise a magnetic influence on said pilot coil (f) too.

Inventors: LEONARDI, DANIO
Applicants: DUCATI ENERGIA S.P.A.
Application year: 1988
Main classification: F02P1
IPC codes: H02K21, F02P1, F02P3