WO2005076439A1

WO2005076439A1 - Rotary electrical generating machine with dual electrical energy source

Info

Publication number: WO2005076439A1
Application number: PCT/EP2005/000157
Authority: WO
Inventors: Lino Soga
Original assignee: Sincro S.R.L.
Priority date: 2004-02-06
Filing date: 2005-01-11
Publication date: 2005-08-18
Also published as: ITVI20040016A1

Abstract

The invention concerns a rotary electrical generating machine that supplies a dual electrical energy source, characterised in that it has a single casing (1), as well as two couples, 5 each formed from a stator (3, 3') and a rotor (4' and 4'' ), which can also be morphologically quite different to each other, the rotors .being fitted onto the same shaft (2). The machine can thus act as a dual electrical energy source, for example acting at the same time as direct current 10 generator, as well as as a mono-phase or three-phase alternating current generator.

Description

Title: ROTARY ELECTRICAL GENERATING MACHINE WITH DUAL ELECTRICAL ENERGY SOURCE

Description

The present finding concerns a rotary electrical generating machine with dual electrical energy source.

It is known that in many technical fields there is often the need to make use of many electrical energy sources with even substantially different parameters.

As an example, we quote the need, in some industries, to simultaneously have both a high direct current, but low voltage, to be used in the field of welding, and an alternating current for supplying power to three-phase or mono-phase apparatuses.

In most cases, two different energy sources are simply used, but it has also been attempted to obtain this result through a single rotary electric machine.

Regarding this, indeed, rotary electric machines have been made that have, at the recesses of the stator, two galvanically separate windings, one of which is used for alternating current power supply, whereas the other is used for direct current power supply, of course provided suitable rectification.

The fact that this pair of windings, which, by necessity, must be electrically contiguous, is foreseen, gives rise first of all to substantial design and constructive complications. Secondarily, it is clear that the electromagnetic fluxes due to the armature reactions that are generated in these two contiguous windings interact with each other, sometimes randomly and the end result is to give rise to an irregular flux in the air gap, with problems concerning the regularity of the voltage generated.

In particular, the problem is accentuated in the case in which, as often occurs, one of the two windings is used to supply power in direct current to a welding system, because in such a case the current that circulates in the relative winding has very substantial irregularities, which cannot avoid affecting the flux generated by such a current, as specified previously. The purpose of the present finding is that of making a rotary electrical generating machine that is able to provide a dual electrical energy source, but that does not have the drawbacks specified above. This is obtained, according to the finding, by foreseeing that the machine has a single shaft and a single casing, but that it also has two couples each formed from a rotor and a stator, also morphologically quite different to each other, said rotors, however, being fitted onto the same shaft. In this way the winding that ends at one of the stators shall be able to provide direct current, whereas the winding that ends at the other stator shall be able to provide a power supply with alternating current.

These and other characteristics of the finding shall now be described in detail, with reference to one particular embodiment thereof, given only as a non-limiting example, with the help of the attached table of drawings, where: fig. 1 represents a side view of the device according to the finding; - fig. 2 represents a longitudinal section view, carried out according to the lines II-II of fig. 1.

As can be seen in the figures, the device according to the finding consists of a rotary electrical generating machine that has a single casing 1, as well as a single shaft 2. Vice-versa, the machine has two couples, each formed from a stator 3' and 3' ' and a rotor 4' and 4' ' .

From figure 2 it can be seen that both the rotors and the stators can even be morphologically very different to each other, but in any case the rotors shall both be fitted onto the same drive shaft. The rotors can be of the wound type, or else they can have permanent magnets. In practice, the electrical machine is placed in rotation by a suitable run motor until the nominal number of revolutions is reached.

From the output terminal of the machine it is therefore possible to obtain a mono-phase or three-phase power supply in alternating current, as well as a power supply in direct current to be used, for example, to supply an electric welder with power.

With respect to an electric machine of the type described previously, which has a single pack of plates (stator-rotor) used both for the output of the welder and for that of the alternating current generator, the following advantages are obtained:

1. the current generation system is completely independent from the welding system; 2. the possible damaging of the windings of one of the two systems still allows the other to work correctly;

3. a perfect galvanic separation between the windings of the two systems is obtained without any particular provision;

4. the mutual insulation of the respective lines from electromagnetic disturbances is ensured;

5. it is possible to foresee two voltage adjustment systems, which are completely autonomous and also of different types to each other.

It should be noted that with the device according to the finding it is possible to foresee two independent rotors, which also have different polarities, with different external diameters, which greatly eases the design of the system.

The present finding can also take up different shapes and appearances with respect to those illustrated and described previously, maintaining its essential characteristics, without for this reason departing from the scope of protection of the patent.

Claims

1. ROTARY ELECTRICAL GENERATING MACHINE WITH DUAL ELECTRICAL ENERGY SOURCE, characterised in that it has a single casing (1) and a single rotary shaft (2), as well as two couples, each formed from a rotor (4' and 4''), as well as a from a stator (3, 3' ) , both of the rotors (4', 4'') being fitted onto the shaft.

2. MACHINE, according to claim 1, characterised in that it provides a power source in direct current and a power source in mono-phase or three-phase alternating current.

3. MACHINE, according to claim 1, characterised in that it provides two power sources in alternating current .

4. MACHINE, according to claim 1, characterised in that one of the rotors (4') is of the wound type, whereas the other rotor (4^A ) is of the type with permanent magnets.