Wound rotor

Abstract

The invention relates to a wound rotor (1, 100, 200) for an electric motor, comprising an insulating structure (4) and at least one coil (2) of electric wire (3) attached to said insulating structure (4), said wire (3) having a plurality of wound turns forming said coil (2), an incoming section (5) and an outgoing section (6). According to the invention, the insulating structure (4) comprises at least one guiding device (7, 10, 11, 12, 13) arranged next to said at least one coil (2) so that at least one section to be chosen from among the incoming section (5) and the outgoing section (6) of the wire (3) is inserted into said guiding device (7, 10, 11, 12, 13), said guiding device (7, 10, 11, 12, 13) serving to keep the section (5, 6) of wire (3) that has been inserted therein under mechanical tension and to keep said incoming section (5) and said outgoing section (6) spaced apart from each other.

Description

Description Title of the invention: WOUND ROTOR

[0001] The present invention relates to a wound rotor.

[0002] When manufacturing a wound rotor, it is desirable to have the most repeatable and homogeneous wire organization possible for all the turns of each pole, in order to be able to insert a holding and / or compression system as easily as possible, and therefore to guarantee its cohesion and its resistance in centrifugation.

[0003] During a pole winding operation, an input portion and an output portion of the wire are caused to cross, causing an electrical insulation problem if the wire enamel is damaged or if it deteriorates in the event of friction, for example during operation of the motor.

[0004] In addition, during a winding operation, the passage from one pole to another can also cause a loss of wire tension. This loosening of the wire does not guarantee the position and cohesion of the wires, which can lead to difficulty and / or impossibility of setting up the winding holding system.

[0005] Currently, the processes for obtaining the winding do not guarantee good homogeneity and good cohesion of the last turns, and the loosening of the wire of the last layer can lead to non-conformity of the rotor, due to: - non-fitting of the holding system, - degradation of the wire enamel, which can generate rotor scrap due to insulation faults.

[0006] A wound rotor of an electric motor according to the invention overcomes the drawbacks encountered in existing wound rotors mentioned above.

[0007] The invention relates to a wound rotor of an electric motor comprising an insulating structure and at least one coil of conductive wire fixed to this insulating structure, said wire having several wound turns forming said coil, an input section and an output section.

[0008] According to the invention, the insulating structure comprises at least one guide device arranged next to said at least one coil so that at least one section to be chosen from the input section and the output section of the wire is inserted into said guide device, said guide device serving to keep the section of wire which has been inserted therein under mechanical tension and to keep said input section and said output section away from each other. The guide device thus has a dual function: -make the section of the conductive wire inserted into it adopt a particular profile, so as to block the said section in translation and maintain all the turns of the coil under mechanical tension, -keep the input section and the output section of the wire separate from each other so that the two sections have no contact with each other.

[0009] In this way, the conductive wire is wound to form the coil with a certain mechanical tension reducing the risks of formation of loose turns. In addition, since the input section and the output section will remain at a distance from each other, the risks of short circuit between said two sections are reduced or even eliminated. Similarly, these two sections, which have little chance of coming into contact with each other, will not wear out due to mutual friction, thus preserving the integrity of the wound rotor. Each coil of wire of the wound rotor can be associated either with two guiding devices for the input section and for the output section of the electric wire, or with a single guiding device for the input section or for the output section of said conductive wire. Preferably, each guiding device is mechanical.For example, it can be represented by a slot, a groove, a groove or pins forcing the section of wire concerned to have a sinuous path. The term "insulator" attributed to the structure of the wound rotor means "electrical insulator".

[0010] According to a possible characteristic of the invention, said at least one guide device is configured so that the section of wire passing through said guide device adopts an S-shaped profile. This S-shaped profile is that adopted by the section of wire concerned when it passes through the guide device. By adopting such an S-shaped profile, the section concerned will locally extend perpendicular to the rest of said section and will thus block the wire without it being able to loosen around the spool.

[0011] According to a possible characteristic of the invention, said at least one guide device is constituted by a split pin having a slot through which the section of wire concerned passes. The slot will constitute a passage in which the section of wire concerned will be housed. Advantageously, the slot is bordered by two raised lateral edges which will prevent the section of wire concerned from coming out of said slot. The guide device is intended to ensure positional stability of the section of wire concerned passing through said guide device and adopting a particular profile. Advantageously, the slot has a bottom having dimensions slightly greater than those of the section of wire concerned, so that said section can occupy the bottom of said slot without introducing play.

[0012] According to a possible characteristic of the invention, said at least one split pin emerges from the insulating structure so as to have a first end which is in contact with said insulating structure and a second end which is opposite said first end and in which the slot has been hollowed out. The split pin therefore protrudes from the insulating structure of the wound rotor and thus forces the section of wire concerned to enlarge its path by passing through the slot of the split pin. The second end re- shows the part of the split pin which is furthest from the insulating structure.

[0013] According to a possible characteristic of the invention, the insulating structure and said at least one split pin are made in one piece. In this way, the insulating structure of the wound rotor and the various split pins will be manufactured with the same material and during the same manufacturing operation. Said insulating structure and said split pins thus form a common resulting part, made of a single material.

[0014] According to a possible characteristic of the invention, the insulating structure and said at least one split pin are made of rigid plastic material. In this way, said insulating structure and the various split pins have good mechanical strength without significantly weighing down the wound rotor.

[0015] According to a possible characteristic of the invention, the wound rotor comprises two split pins, one of which is provided to receive the input section of the conductive wire and the other is provided to receive the output section of said conductive wire. In this way, the two split pins will cause the input section and the output section to adopt particular profiles, which will contribute to maintaining good mechanical tension on the wound conductive wire forming the wire coil and which will keep said two sections away from each other.

[0016] According to a possible characteristic of the invention, the two split pins are arranged on the insulating structure at a certain distance from each other so that the input section of the wire remains at a certain distance from the output section of said wire. For such a configuration, the input section and the output section of the electric wire will not be able to come into contact with each other or become tangled.

[0017] According to a possible characteristic of the invention, said at least one guiding device consists of three studs between which the section of wire concerned passes, said three studs being arranged on the insulating structure in such a way that they will force the section of wire concerned to follow a sinuous path in the middle of said studs. These three studs between which the section concerned will pass, will force said section concerned to have a sinuous path between said studs, to allow the section to have a wire blocking function so that the turns of the coil remain taut.

[0018] According to a possible characteristic of the invention, the wound rotor comprises several coils of electric wire, and each coil of wire is associated with at least one guide device.

[0019] A wound rotor according to the invention has the advantage of comprising coils of wire having taut and therefore well-ordered turns, thanks to the judicious use of light and compact split guide pins. In addition, the split pins of a rotor according to the invention have the advantage of having a second function which is that of keeping an input section and an output section of a conductive wire at a distance. wound forming a coil of wire, to prevent wear by mutual friction of said sections.

[0020] A detailed description of a preferred embodiment of a wound rotor according to the invention is given below, with reference to the following figures:

[0021] [Fig.l] [Fig.l] is a side view of an area of ​​a wound rotor according to the invention, showing a coil of wire and two split pins,

[0022] [Fig.2] [Fig.2] is a side view of an area of ​​a wound rotor according to the state of the art, showing a coil of wire, an input section and an output section of said wire in a first configuration,

[0023] [Fig.3] [Fig.3] is a perspective view of an area of ​​a first preferred embodiment of a wound rotor according to the invention,

[0024] [Fig.4] [Fig.4] is a side view of an area of ​​a wound rotor according to the state of the art, showing a coil of wire, an input section and an output section of said wire in a second configuration,

[0025] [Fig.5] [Fig.5] is a perspective view of an area of ​​a second preferred embodiment of a wound rotor according to the invention,

[0026] [Fig.6] [Fig.6] is a schematic view of an area of ​​a third embodiment of a wound rotor according to the invention, showing a coil of wire and three pads,

[0027] Generally, a wound rotor 1 schematically comprises several poles in the form of coils 2 of conductive wire 3, and an insulating structure 4, which may for example be made of plastic, and on which said coils 2 of conductive wire 3 are fixed. The wire 3 conducting electric current is preferably made of metal. The insulating structure 4 is an insulating structure with respect to the electric current. The conductive wire 3 which is wound around a coil 2 has an input section 5 and an output section 6 between which are located a plurality of turns. A tensile force exerted on these two sections 5, 6 in opposite directions makes it possible to obtain turns wound around the coil 2, which are taut without revealing any slack parts.

[0028] Current wound rotors 1 have at least two major drawbacks: - once the tensile force has been exerted on the input section 5 and / or on the output section 6 of the conductive wire 3 to obtain a coil 2 of wire with taut turns, there is no element of the wound rotor 1 allowing this tensile force to be maintained. It therefore happens quite often that at least one turn of the coil 2 becomes loose, degrading the performance of said coil 2, -referring to figures 2 and 4, the input section 5 of the conductive wire 3 and the output section 6 of said conductive wire 3 may cross and come into contact with each other. However, such contacting of the two end sections 5, 6 may cause wear of said sections 5, 6 by mutual friction, and / or a short circuit between them, which are two prohibited events.

[0029] In order to resolve these two drawbacks, a wound rotor 100 according to the invention comprises at least one split pin 7 allowing the input section 5 and / or the output section 6 to be inserted into said split pin 7 in order to maintain a certain distance between said two sections 5, 6, and in order to block the section 5, 6 inserted into the split pin 7 in order to maintain a certain state of mechanical tension on the turns of the coil 2.

[0030] Referring to [Fig. 1], the insulating structure 4 of a wound rotor 100 according to the invention comprises as many extensions 8 as it comprises coils 2 of conductive wire. Each extension 8 is provided with several peripheral grooves 9 parallel to each other and in contact with each other. The conductive wire 3 is wound around the extension 8 passing through the peripheral grooves 9, said grooves 9 prefiguring the dimensions and the location of the turns of the coil 2 around the extension 8.

[0031] Referring to Figures 1, 3 and 5, the insulating structure 4 comprises at least two split pins 7 placed in the immediate environment of an extension 8 designed to form the coil 2. The term "immediate environment" means at a maximum distance of a few centimeters from said coil 2. Each split pin 7 is constituted by a protrusion having a first end which is in contact with the insulating structure 4, and a second end constituting the part furthest from said insulating structure 4. This second end is provided with a slot 10 intended to receive either the input section 5 of the conductive wire 3, or the output section 6 of said conductive wire 3. There is no intangible rule for the placement of the two split pins 7 relative to the extension 8 materializing the support of the coil 2.Indeed, the two split pins 7 are placed in the immediate environment of the extension 8, their position being a function of the orientation of said extension 8 on the insulating structure 4 and of the path that the input section 5 and the output section 6 of the conductive wire 3 forming the coil 2 must follow around this extension 8. The input section 5 and / or the output section 6 pass through the slot 10 of the corresponding split pin 7, said split pin 7 having the purpose of making the section 5, 6 considered adopt a localized S-shaped profile at the level of said pin 7. These split pins 7 therefore have a double function:. - ensuring the guidance of the input section 5 and the output section 6 so that they remain at a distance from each other, as illustrated in figures 1, 3 and 5, - ensuring the blocking of the section 5, 6 considered which is inserted into the split pin 7 in order to prevent any translational movement of said section 5, 6. This blocking function is optimized when the section considered 5, 6 adopts a right-angle profile when it passes through the split pin 7.

[0032] Advantageously, the insulating structure 4 and the split pins 7 are made in one piece to form a resulting part in one piece, manufactured with the same material during the same manufacturing operation.

[0033] Referring to [Fig. 6], according to another alternative embodiment of a wound rotor 200 according to the invention, each split pin 7 is replaced by a series of three studs 11, 12, 13 whose particular arrangement requires the conductive wire 3 to follow a sinuous path when it passes between said three studs 11, 12, 13. These three studs 11, 12, 13 have the same function as a split pin 7, with respect to the section 5, 6 of wire concerned.

[0034] A wound rotor 100, 200 according to the invention can be integrated into all electric motors with wound rotors and stators wound on teeth.

Claims

Claims

1. Wound rotor (1, 100, 200) of an electric motor comprising an insulating structure (4) and at least one coil (2) of electric wire (3) fixed to this insulating structure (4), said wire (3) having several wound turns forming said coil (2), an input section (5) and an output section (6), characterized in that the insulating structure (4) comprises at least one guide device (7, 10, 11, 12, 13) arranged next to said at least one coil (2) so that at least one section to be chosen from the input section (5) and the output section (6) of the wire (3) is inserted into said guide device (7, 10, 11, 12, 13), and in that said guide device (7, 10, 11, 12, 13) serves to keep the section (5, 6) of wire under mechanical tension (3) which has been inserted therein and to keep said inlet section (5) and said outlet section (6) away from each other.

2. Wound rotor according to claim 1, characterized in that said at least one guide device (7, 10, 11, 12, 13) is configured so that the section (5, 6) of wire (3) passing through said guide device (7, 10, 11, 12, 13) adopts an S-shaped profile.

3. Wound rotor according to claim 1, characterized in that said at least one guide device is constituted by a split pin (7) having a slot (10) through which the section (5, 6) of wire (3) concerned passes.

4. Wound rotor according to claim 3, characterized in that said at least one split pin (7, 10) emerges from the insulating structure (4) so ​​as to have a first end which is in contact with said insulating structure (4) and a second end which is opposite said first end and in which the slot (10) has been hollowed out.

5. Wound rotor according to any one of claims 3 or 4, characterized in that the insulating structure (4) and said at least one split pin (7) are made in one piece.

6. Wound rotor according to any one of claims 3 to 5, characterized in that the insulating structure (4) and said at least one split pin (7) are made of rigid plastic material.

7. Wound rotor according to any one of claims 3 to 6, characterized in that it comprises two split pins (7), one of which is provided to receive the input section (5) of the electric wire (3) and the other is provided to receive the output section (6) of said electric wire (3).

8. Wound rotor according to claim 7, characterized in that the two split pins (7) are arranged on the insulating structure (4) at a certain distance from each other so that the input section (5) of the wire (3) remains at a certain distance from the output section (6) of said wire (3).

9. Wound rotor according to any one of claims 1 or 2, characterized in that said at least one guide device consists of three studs (11, 1, 13) between which the section (5, 6) of wire concerned passes, said three studs (11, 12, 13) being arranged on the insulating structure (4) in such a way that they will force the section (5, 6) of wire concerned to follow a sinuous path in the middle of said studs (11, 12, 13).

10. Wound rotor according to any one of claims 1 to 9, characterized in that it comprises several coils (2) of electric wire (3), and in that each coil (2) of wire (3) is associated with at least one guide device (7, 10, 11, 12, 13).

Images