Rotor for a synchronous generator

Abstract

The invention concerns a rotor for a synchronous generator having a plurality of salient poles regularly disposed on the outer periphery of a rim, each pole comprising a coil with two external terminals said, respectively, first terminal and second terminal, the poles being arranged so that two adjacent poles have either their respective first terminals or their respective second terminals facing each other, the rotor further comprising at least a first connection between first terminals and/or at least a second connection between second terminals, the rotor being characterized in that the first connection and the second connection comprises a plurality of elongated conductive plates whose each ends (A, B) are secured via a single securing mean on facing terminals.

Claims

1. Rotor for a synchronous generator having a plurality of salient poles regularly disposed on the outer periphery of a rim and spaced by spaces called pole interspaces, each pole comprising a coil with two external terminals called, respectively, first terminal and second terminal, the poles being arranged so that two adjacent poles have either their respective first terminals or their respective second terminals facing each other, the rotor further comprises one or both of a first connection between facing first terminals or a second connection between facing second terminals, and wherein at least one of the first connection or the second connection comprises a plurality of elongated conductive plates, each conducting plate having opposite ends secured with a single securing means to the facing first or second terminals.

2. Rotor according to claim 1, wherein at least one of the first connection and the second connection is flexible.

3. Rotor according to claim 1, wherein at least one of the first connection and the second connection is resilient.

4. Rotor according to claim 1, wherein the single securing means are engaged through a respective hole made on the end of the elongated conductive plate and on the first or second terminal to which the end is secured.

5. Rotor according to claim 1, wherein each securing means comprises a single bolt.

6. Rotor according to claim 1, wherein external terminals emerge in the pole interspace.

7. Rotor according to claim 1, wherein the external terminals are bent or folded so as to impose a convex shape to the elongated conductive plates.

8. Rotor according to claim 1, wherein the elongated conductive plates comprise a central section having a reduced width with respect to a width of the ends of the conductive plates.

9. Rotor according to claim 1, wherein the two facing second terminals are powered terminals connected to an excitation current supply.

10. Rotor according to claim 1, wherein adjacent salient poles have opposite magnetic polarities.

11. Rotor according to claim 1, wherein each elongated conductive plate is made of a metal.

12. A synchronous generator comprising a rotor according to claim 1.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) Other characteristics and advantages will emerge in the description that follows of the embodiments of the rotor for a synchronous generator according to the invention, given as non-restrictive examples, with reference to the appended illustrations wherein:

(2) FIG. 1 is a schematic representation of connection means supported on the rim for a high rotation speed rotor known in the state of the art,

(3) FIG. 2 is a schematic representation of connection means for a low rotation speed rotor known in the state of the art,

(4) FIG. 3 is a schematic representation of a section of a rotor according to the present invention,

(5) FIG. 4 is a schematic representation of the first connection according to the present invention,

(6) FIG. 5 is a cross section of the schematic representation of the first connection of FIG. 4,

(7) FIG. 6 is a top view of the first connection of FIG. 4.

DETAILED DISCLOSURE OF EMBODIMENTS

(8) FIG. 3 represents a rotor 100 for a synchronous generator according to the present invention.

(9) In particular, the rotor 100 comprises a plurality of salient poles 200 regularly disposed on the outer periphery of a rim 300.

(10) Each salient pole 200 comprises a coil which, when circulated by an excitation current, produces a magnetic field.

(11) Each coil comprises two external terminals said, respectively, first terminal 201 (FIG. 3, 4, 5, 6) and second terminal 202 (FIG. 3).

(12) In particular, two adjacent poles 200 are arranged to have either their respective first terminals 201 or their respective second terminals 202 facing each other.

(13) In other words, two adjacent salient poles 200 are arranged to have opposite polarities.

(14) Advantageously, external terminals emerge from poles in a pole interspace.

(15) The rotor 100 according to the present invention further comprises at least a first connection 401 between first terminals 201 and/or at least a second connection 402 between second terminals 202 (FIG. 3).

(16) The first connection and the second connection comprise a plurality of elongated conductive plates, advantageously not supported by the rim.

(17) In particular, each elongated conductive plate comprises a central section C and two ends A and B, each which are secured, with a securing means, respectively, to one and the other terminal of facing terminals.

(18) The first connection and/or the second connection may be flexible.

(19) By “flexible”, it is meant the connections can overcome some deformation when a force stemming from the rotor rotation is applied to them. In particular, it is meant connections having dimensions and/or mechanical properties (for example the Young Modulus) adjusted so that no breaking occurs when a force stemming from rotor rotation is applied to them.

(20) The skilled person with his general knowledge is able to choose the most appropriate materials and dimensions for providing flexible first and or second connections compatible for their implementation in the context of the present invention.

(21) Advantageously, the first connection and/or second connection may be resilient.

(22) By “resilient”, it is meant the connections can overcome some deformation, but limited to elastic deformation, when a force stemming from the rotor rotation is applied to them. In particular, it is meant connections having dimensions and/or mechanical properties (for example the Young Modulus) adjusted so that no breaking occurs when a force stemming from rotor rotation is applied to them.

(23) The skilled person with his general knowledge is able to choose the most appropriate materials and dimensions for providing resilient connections compatible for their implementation in the context of the present invention.

(24) The securing means can, advantageously, be engaged through two cooperating holes made on the end of the considered elongated conductive plate and on the terminal to which said end is secured.

(25) For example, the securing mean can comprise, but not limited to, a bolt/nut assembly, a screw, a rivet (FIG. 6).

(26) Advantageously, each elongated conductive plate is made of a metal. For example, the metal comprises copper or aluminum.

(27) The consideration of a single securing mean, for example a single bolt, per end for attaching the elongated conductive plate to two facing terminals improves the flexibility of the connection which is therefore less sensitive to salient poles displacement.

(28) Furthermore, the fact that the connection between facing terminals is ensured by a plurality of elongated conductive plates globally reduces the effect of the mass of said connection, and, as a consequence, the sensitivity to a stress induced by the rotation of the rotor.

(29) In a particular embodiment, the external terminals are bent or folded so as to impose a convex shape to the elongated conductive plates (FIG. 5). This configuration further improves the flexibility of the connection means and as a consequence reduces their sensitivity to the relative displacement of the salient poles.

(30) Advantageously, the central section C of the elongated conductive plates has a reduced width with respect to the ends A and B.

(31) This reduced width makes it possible to create ventilation spaces between the elongated conductive plates. This ventilation limits the temperature increase due to the heating occurring during rotation of the rotor.

(32) The rotor can further comprise a current supply connected to two second terminals 202, said powered terminals.

(33) The invention also concerns a synchronous generator, in particular a synchronous hydrogenerator, which comprises the rotor according to the present invention.