Rotor of rotating electrical machine and electromagnetic retarder and generator assembly

Abstract

The invention relates to a rotor (2) of a rotating electrical machine, the rotor comprising: - a central ring (4) intended to be mounted around a rotating shaft; - a cylindrical body (6) having an internal face (10) arranged opposite the central ring, an external face (12) opposite the internal face and a lateral fixing face (14), the cylindrical body being coaxial with the central ring; - a fixing arm (8) connected to the central ring and to the lateral fixing face of the cylindrical body. The external face of the cylindrical body comprises an edge adjacent to the lateral fixing face, called the first edge (18); said first edge comprises a slope inclined towards the axis of rotation (XX). The invention also relates to an electromagnetic retarder and generator assembly. Figure to be published with the abstract: Figure 1

Description

Title of the invention: Rotor of a rotating electrical machine and electromagnetic retarder and generator assembly Technical field of the invention

[0001] The invention relates to a rotor of a rotating machine and in particular to an electromagnetic retarder rotor for a vehicle. The invention also relates to an electromagnetic retarder and generator assembly. State of the prior art

[0002] A rotor of an electromagnetic retarder and generator assembly is known, comprising a central ring intended to be mounted on a rotating shaft, a lateral flange and a cylindrical body coaxial with the central ring. The flange is constituted by a ring-shaped plate which connects the inner ring to the cylindrical body. The cylindrical body constitutes the armature of the retarder.

[0003] Such a rotor is described in patent application FR 18 55 848 filed in the name of the applicant. However, the cylindrical body may deform after a large number of uses due to the fact that it is subjected to high temperatures. It would be desirable to further cool the armature of this rotor Presentation of the invention

[0004] It would be desirable to provide a rotor that does not deform over time under the effect of heat. It would be desirable to improve the cooling of the cylindrical body. Summary of the invention

[0005] The present invention relates to a rotor of a rotating electrical machine, in particular of an electromagnetic retarder for a vehicle, the rotor being capable of rotating around an axis of rotation in a direction of rotation, the axis of rotation extending in an axial direction, the rotor comprising: - a central ring intended to be mounted around a rotating shaft; - a cylindrical body having an internal face arranged opposite the central ring, an external face opposite the internal face and a lateral fixing face, the cylindrical body being coaxial with the central ring; - at least one fixing arm connected to the central ring and to the lateral fixing face of the cylindrical body, characterized in that the external face of the cylindrical body comprises an edge adjacent to the lateral fixing face, called the first edge; said first edge comprises a slope inclined towards the axis of rotation. Advantageously, this slope makes it possible to increase the quantity of air passing through the - above the outer surface of the cylindrical body. The amount of air entering the cooling channels is increased. As the air was introduced into the cooling channels through a wider opening, the speed of air passage in the cooling channels is increased.

[0006] The features set forth in the following paragraphs may optionally be implemented. They may be implemented independently of one another or in combination with one another: - the slope is inclined at an angle between 10 degrees and 30 degrees relative to the axis of rotation. - The rotor further comprises a crown coaxial with the cylindrical body, the crown is arranged around the cylindrical body; the crown comprises a lateral end set back from the lateral fixing face in the axial direction, the lateral end of the crown being distant from the lateral fixing face by a distance greater than 15 millimeters, said distance being measured in the axial direction. - The slope has a width in the axial direction; and in which the width of the slope is greater than the distance between the lateral end and the lateral fixing face. - The rotor further comprises a plurality of first cooling fins arranged at least partly on the slope of the external face of the cylindrical body, the first cooling fins being arranged parallel to each other, along the first edge, the first cooling fins being curved and having a concavity oriented towards the front considering the direction of rotation of the rotor. - The outer face of the cylindrical body comprises a second edge opposite the first edge and in which the rotor further comprises a plurality of second cooling fins arranged on a portion of the outer face of the cylindrical body, the second cooling fins being arranged parallel to each other, along the second edge, the second cooling fins being curved and having a concavity oriented towards the rear considering the direction of rotation of the rotor. - At least part of the external face of the cylindrical body comprises reliefs. - The reliefs comprise undulations; said undulations comprising a succession of hollows and circular roundings having as their center a point on the axis of rotation XX.

[0007] The invention also relates to an electromagnetic retarder and generator assembly, said assembly comprising a stator and a rotor; the stator comprising an external face and an internal face; the external face carrying a retarder inductor arranged opposite an internal face of the cylindrical body; the internal face carrying a generator armature; the rotor being shaped according to the characteristics mentioned above. above, the cylindrical body forming a retarder armature, the central ring comprising a generator inductor arranged opposite the internal face of the stator. Brief description of the figures

[0008] [Fig-1] is a perspective view of a part of a rotor according to the invention;

[0009] [Fig.2] is a radial sectional view of the rotor illustrated in [Fig.l];

[0010] [Fig.3] is a schematic view of a section of the cylindrical body and the crown, the cutting plane being a radial plane;

[0011] [Fig.4] is a top view of a portion of the rotor illustrated in [Fig.l];

[0012] [Fig.5] is a schematic radial sectional view of part of a ra assembly Electromagnetic retarder and generator comprising a rotor illustrated in [Fig.l]. Detailed description of the invention

[0013] With reference to [Fig.l], the invention relates to a rotor 2 of a rotating electrical machine. For example, the rotor 2 is an electromagnetic retarder rotor for a vehicle. In particular, this rotor can be mounted in an electromagnetic retarder and generator assembly as illustrated in [Fig.5].

[0014] The rotor 2 is capable of rotating around an axis of rotation XX extending in an axial direction A. For the purposes of the present description, a radial plane PR is defined perpendicular to the axis of rotation XX.

[0015] The rotor 2 comprises a central ring 4 intended to be fixed to a rotating shaft not shown, a cylindrical body 6 and fixing arms 8 connected to the central ring and to the cylindrical body.

[0016] The central ring 4 and the cylindrical body 6 are coaxial.

[0017] The cylindrical body 6 comprises an internal face 10 arranged opposite the ring central, an external face 12 opposite the internal face, a lateral fixing face 14 and a lateral face 16 opposite the lateral fixing face.

[0018] In the example illustrated by way of example and in no way limiting, the rotor 2 comprises ten fixing arms. The fixing arms 8 are regularly distributed around the central ring.

[0019] The external face 12 of the cylindrical body comprises an edge adjacent to the lateral fixing face, called the first edge 18 and an edge arranged on the opposite side, called the second edge 20.

[0020] With reference to figures 2 and 3, the first edge 18 comprises a slope 22 inclined towards the axis of rotation XX.

[0021] The slope 22 is inclined at an angle α of between 10 degrees and 30 degrees relative to the axis of rotation XX.

[0022] The slope 22 has a width L in the axial direction A.

[0023] Thus, with reference to [Fig.3], the external face 12 of the cylindrical body comprises a portion 24 having a general cylindrical shape and a portion 26 having the shape of a truncated cone. The portion 26 in the shape of a truncated cone is adjacent to the lateral fixing face 14.

[0024] Advantageously, the slope 22 makes it possible to increase the quantity of air passing over the external surface of the cylindrical body. As a result, the quantity of air entering the cooling channels 30 is increased because the opening allowing the introduction of air is wider. As a greater quantity of air is introduced into the cooling channels, the speed of passage of the air in the cooling channels is increased.

[0025] Preferably, the portion 24 having a general cylindrical shape comprises reliefs 28 shown only in [Fig.2]. In particular, in the embodiment illustrated by way of example, the reliefs 28 comprise undulations. The undulations comprise a succession of circular hollows and circular rounded portions having as their center a point on the axis of rotation XX.

[0026] According to a variant not shown, the reliefs 28 comprise bosses, depressions or roughness.

[0027] Advantageously, these reliefs 28 create disturbances in the layer of air passing above the external face of the cylindrical body. These disturbances make it possible to increase the cooling of the cylindrical body 6.

[0028] Advantageously, the portion 26 in the shape of a truncated cone, or in other words the slope 22, is smooth. It does not have any reliefs. This smooth surface makes it possible to increase the quantity of air and the speed of the air entering the cooling channels 30.

[0029] With reference to Figures 2 and 4, the cylindrical body 6 preferably comprises a plurality of first cooling fins 32 arranged at least partly on the slope 22 of the external face 12 of the cylindrical body. The first cooling fins have a lamella shape. The median plane PM of the first cooling fins 38 is oriented at an angle of between 40 degrees and 60 degrees relative to the radial plane PR. Preferably, this angle 0 (theta) is substantially equal to 45 degrees. The first cooling fins 32 are curved. They have a concavity oriented towards the front considering the direction of rotation R of the rotor. In other words, a vector normal to the concave face is directed in the direction of rotation R. The first cooling fins 32 are arranged parallel to each other. They are aligned and form a first row extending along the first edge 18.

[0030] Preferably, the cylindrical body 6 further comprises a plurality of second cooling fins 36 arranged on the cylindrical portion of the external face of the cylindrical body. The second cooling fins 36 have a lamella shape. The second cooling fins 36 are curved. They have a concavity oriented backwards considering the direction of rotation R of the rotor. In other words, a vector normal to the concave face is directed in a direction opposite to the direction of rotation R.

[0031] The second cooling fins 36 are arranged parallel to each other. The second cooling fins 36 are also parallel to the first cooling fins 32. They are aligned and form a second row which extends along the second edge 20.

[0032] In the illustrated and in no way limiting embodiment, the cylindrical body 6 comprises a third row and a fourth row of cooling fins 36, visible in [Fig.2]. The cooling fins of the third row and the fourth row are identical and oriented in the same way as the cooling fins 36 of the second row. In particular, their concave face is oriented in the same way as the cooling fins of the second row. They bear the same reference 36 and are not described again.

[0033] Preferably, the rotor 2 further comprises a crown 44 coaxial with the cylindrical body 6. The crown 44 is arranged around the cylindrical body. The crown 44 has a width less than the width of the cylindrical body. It is arranged above a central part of the cylindrical body. The crown 44 covers the cooling fins 36 of the third row, the cooling fins 36 of the fourth row, a part of the cooling fins 32 of the first row and a part of the cooling fins 36 of the second row. The cooling fins 32, 36 form with the crown 44 cooling channels 30, visible in [Fig.l].

[0034] The crown 44 comprises a first lateral end 46 located on the side of the lateral fixing face 14 and a second lateral end 38 on the opposite side.

[0035] The first lateral end 46 is arranged set back in the axial direction A from the lateral fixing face 14 of the cylindrical body. The lateral end 46 of the crown is distant from the lateral fixing face 14 by a distance D greater than 15 millimeters. Preferably, this distance D is between 15 and 30 millimeters. This distance D is measured in the axial direction.

[0036] With reference to figures 3 and 4, the slope 22 preferably has a width L in the axial direction A. The width L of the slope is greater than the distance D between the first lateral end 46 and the lateral fixing face 14.

[0037] In the embodiment illustrated in the figures and in no way limiting, the second lateral end 48 is also arranged set back in the axial direction A from the lateral face 16 of the cylindrical body.

[0038] With reference to [Fig.5], the invention also relates to an electromagnetic retarder and generator assembly 48. This assembly comprises a rotor 2 and a stator 50. The rotor 2 is shaped according to the characteristics mentioned above.

[0039] The stator 50 comprises an external face 52 and an internal face 54. The external face 52 carries a retarder inductor 56 arranged opposite an internal face 10 of the cylindrical body. The internal face 54 carries a generator armature 58. The cylindrical body 6 of the rotor 2 forms a retarder armature. The central ring 4 comprises a generator inductor 60 arranged opposite the internal face 54 of the stator.

Claims

Claims

1. Rotor (2) of a rotating electrical machine, in particular of an electromagnetic retarder for a vehicle, the rotor (2) being capable of rotating about an axis of rotation (XX) in a direction of rotation (R), the axis of rotation extending in an axial direction (A), the rotor (2) comprising: - a central ring (4) intended to be mounted around a rotary shaft; - a cylindrical body (6) having an internal face (10) arranged opposite the central ring, an external face (12) opposite the internal face and a lateral fixing face (14), the cylindrical body (6) being coaxial with the central ring (4); - at least one fixing arm (8) connected to the central ring (4) and to the lateral fixing face of the cylindrical body, characterized in that the external face (12) of the cylindrical body has an edge adjacent to the lateral fixing face, called the first edge (18); said first edge (18) comprises a slope (22) inclined towards the axis of rotation (XX).

2. Rotor (2) according to claim 1, wherein said slope (22) is inclined at an angle (a) between 10 degrees and 30 degrees relative to the axis of rotation (XX).

3. Rotor (2) according to any one of claims 1 and 2, which further comprises a crown (44) coaxial with the cylindrical body (6), the crown (44) is arranged around the cylindrical body; the crown (44) comprises a lateral end (46) set back from the lateral fixing face (14) in the axial direction (A), the lateral end (46) of the crown being distant from the lateral fixing face (14) by a distance (D) greater than 15 millimeters, said distance (D) being measured in the axial direction (A).

4. Rotor (2) according to claim 3, wherein the slope (22) has a width (L) in the axial direction (A); and wherein said width (L) of the slope is greater than the distance (D) between the lateral end (46) and the lateral fixing face (14).

5. A rotor (2) according to any one of claims 1 to 4, which further comprises a plurality of first cooling fins (32) arranged at least partly on the slope of the outer face (12) of the cylindrical body, the first cooling fins (32) being arranged parallel to each other, along the first edge (18), the first cooling fins (32) being curved and having a concavity oriented towards the front considering the direction of rotation (R) of the rotor.

6. Rotor (2) according to claim 5, wherein the external face (12) of the cylindrical body comprises a second edge (20) opposite the first edge (18) and wherein the rotor further comprises a plurality of second cooling fins (36) arranged on a portion of the external face (12) of the cylindrical body, the second cooling fins (36) being arranged parallel to each other, along the second edge (20), the second cooling fins (36) being curved and having a concavity oriented towards the rear considering the direction of rotation (R) of the rotor.

7. Rotor (2) according to any one of claims 1 to 6, in which at least a part of the external face (12) of the cylindrical body comprises reliefs (28).

8. Rotor (2) according to claim 7, in which the reliefs (28) comprise undulations; said undulations comprising a succession of hollows and circular roundings having as their center a point on the axis of rotation XX.

9. Electromagnetic retarder and generator assembly (48), said assembly comprising a stator (50) and a rotor (2); the stator (50) comprising an external face (52) and an internal face (54); the external face (52) carrying a retarder inductor (56) arranged opposite an internal face (10) of the cylindrical body; the internal face (54) carrying a generator armature (58); the rotor being shaped according to any one of claims 1 to 8, the cylindrical body (6) forming a retarder armature, the central ring (4) comprising a generator inductor (60) arranged opposite the internal face (54) of the stator.

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