Rotating electric machine rotor and electromagnetic retarder assembly and generator

Abstract

The invention relates to a rotor (2) of a rotating electrical machine, the rotor comprising: - a central ring (4) for mounting around a rotating shaft; - a cylindrical body (6) having an inner face (10) facing the central ring, an outer face (12) opposite the inner face, and a lateral mounting face (14), the cylindrical body being coaxial with the central ring; - a mounting arm (8) connected to the central ring and to the lateral mounting face of the cylindrical body. The outer face of the cylindrical body has an edge adjacent to the lateral mounting face, called the first edge (18); said first edge has 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 abbreviation: Figure 1

Description

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

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

[0002] A rotor of an electromagnetic retarder and generator assembly is known, comprising a central ring for mounting on a rotating shaft, a side flange, and a cylindrical body coaxial with the central ring. The flange consists of a ring-shaped plate connecting the inner ring to the cylindrical body. The cylindrical body constitutes the armature of the retarder.

[0003] Such a rotor is described in French patent application FR 18 55 848 filed in the name of the applicant. However, the cylindrical body can deform after a large number of uses due to being 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 propose a rotor that does not deform over time under the effect of heat. It would also be desirable to improve the cooling of the cylindrical body. Summary of the invention

[0005] The present invention relates to a rotor for a rotating electrical machine, in particular an electromagnetic retarder for a vehicle, the rotor being adapted to rotate about an axis of rotation in a direction of rotation, the axis of rotation extending along an axial direction, the rotor comprising: - a central ring intended to be mounted around a rotating shaft; - a cylindrical body having an inner face arranged opposite the central ring, an outer face opposite the inner 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 has an edge adjacent to the lateral fixing face, called the first edge; said first edge includes a slope inclined towards the axis of rotation. Advantageously, this slope increases the amount of air passing through the - above the external surface of the cylindrical body. The amount of air entering the cooling channels is increased. Because the air was introduced into the cooling channels through a larger opening, the airflow velocity within the cooling channels is increased.

[0006] The features described in the following paragraphs may optionally be implemented. They may be implemented independently of each other or in combination with each other: - the slope is inclined at an angle between 10 degrees and 30 degrees relative to the axis of rotation. - The rotor further comprises a ring coaxial with the cylindrical body, the ring is arranged around the cylindrical body; the ring includes a lateral end set back from the lateral fixing face in the axial direction, the lateral end of the ring being away 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 along the axial direction; and in which the width of the slope is greater than the distance between the lateral end and the lateral face of attachment. - 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 convex and having a concavity oriented towards the front when considering the direction of rotation of the rotor. - The external face of the cylindrical body has a second edge opposite the first edge and in which the rotor further has a plurality of second cooling fins arranged on a part of the external face of the cylindrical body, the second cooling fins being arranged parallel to each other, along the second edge, the second cooling fins being convex and having a concavity oriented towards the rear when considering the direction of rotation of the rotor. - At least part of the external face of the cylindrical body includes reliefs. - The reliefs include undulations; said undulations comprising a succession of hollows and circular curves 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 forms a retarder armature, the central ring comprising a generator inductor positioned opposite the inner face of the stator. Brief description of the figures

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

[0009] [Fig.2] is a radial cross-sectional view of the rotor illustrated in [Fig.1];

[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 part of the rotor illustrated in [Fig.1];

[0012] [Fig.5] is a schematic radial cross-sectional view of part of a ra assembly electromagnetic retarder and generator comprising a rotor illustrated in [Fig.1]. Detailed description of the invention

[0013] With reference to [Fig. 1], 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 designed to rotate around an axis of rotation XX extending along an axial direction A. For the purposes of this description, a radial plane PR is defined perpendicular to the axis of rotation XX.

[0015] The rotor 2 includes 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 the cylindrical body.

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

[0017] The cylindrical body 6 comprises an inner face 10 disposed 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 has ten mounting arms. The mounting arms 8 are regularly distributed around the central ring.

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

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

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

[0022] The slope 22 has a width L along 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 portion 26 having the shape of a truncated cone. The truncated cone-shaped portion 26 is adjacent to the lateral fixing face 14.

[0024] Advantageously, the slope 22 increases the amount of air passing over the external surface of the cylindrical body. Consequently, the amount of air entering the cooling channels 30 is increased because the opening allowing air introduction is wider. As a greater quantity of air is introduced into the cooling channels, the air velocity within 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 curves centered on a point on the axis of rotation XX.

[0026] According to an unrepresented variant, the reliefs 28 include bosses, indentations or roughness.

[0027] Advantageously, these reliefs 28 create disturbances in the layer of air passing over the outer face of the cylindrical body. These disturbances increase the cooling of the cylindrical body 6.

[0028] Advantageously, the truncated cone-shaped portion 26, or in other words the slope 22, is smooth. It has no raised areas. This smooth surface makes it possible to increase the quantity and speed of 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 partially on the slope 22 of the external face 12 of the cylindrical body. The first cooling fins are blade-shaped. The median plane PM of the first cooling fins 38 is oriented at an angle between 40 degrees and 60 degrees with respect to the radial plane PR. Preferably, this angle θ (theta) is approximately 45 degrees. The first cooling fins 32 are convex. They have a concavity oriented forward with respect to 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 outer face of the cylindrical body. The second cooling fins 36 are blade-shaped. The second cooling fins 36 are convex. They have a concavity oriented towards the rear when considering the direction of rotation R of the rotor. In other words, a normal vector to the concave face is directed in the opposite direction 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 extending along the second edge 20.

[0032] In the illustrated, but not limiting, embodiment, the cylindrical body 6 comprises a third and a fourth row of cooling fins 36, visible in [Fig. 2]. The cooling fins of the third and fourth rows 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 numeral 36 and are not described again.

[0033] Preferably, the rotor 2 further comprises a ring 44 coaxial with the cylindrical body 6. The ring 44 is arranged around the cylindrical body. The ring 44 has a width less than the width of the cylindrical body. It is positioned above a central portion of the cylindrical body. The ring 44 covers the cooling fins 36 of the third row, the cooling fins 36 of the fourth row, a portion of the cooling fins 32 of the first row, and a portion of the cooling fins 36 of the second row. The cooling fins 32, 36, together with the ring 44, form cooling channels 30, visible in [Fig. 1].

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

[0035] The first lateral end 46 is set back along the axial direction A from the lateral mounting face 14 of the cylindrical body. The lateral end 46 of the ring is positioned away from the lateral mounting 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 along the axial direction.

[0036] With reference to figures 3 and 4, the slope 22 preferably has a width L along 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 not limiting in any way, the second lateral end 48 is also arranged in recess along the axial direction A of 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 conformed according to the characteristics mentioned above.

[0039] The stator 50 comprises an outer face 52 and an inner face 54. The outer face 52 carries a retarder inductor 56 arranged opposite an inner face 10 of the cylindrical body. The inner 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 inner face 54 of the stator.

Claims

Demands

1. Rotor (2) of a rotating electrical machine, in particular of an electromagnetic slow-speed motor for a vehicle, the rotor (2) being adapted to rotate about an axis of rotation (XX) in a direction of rotation (R), the axis of rotation extending along an axial direction (A), the rotor (2) comprising: - a central ring (4) intended to be mounted around a rotating shaft; - a cylindrical body (6) having an inner face (10) disposed opposite the central ring, an outer face (12) opposite the inner 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 outer face (12) of the cylindrical body has an edge adjacent to the lateral fixing face, called the first edge (18); said first edge (18) includes 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 with respect to the axis of rotation (XX).

3. Rotor (2) according to any one of claims 1 and 2, further comprising a ring (44) coaxial with the cylindrical body (6), the ring (44) is arranged around the cylindrical body; the ring (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 ring being away 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) along 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 mounting face (14).

5. Rotor (2) according to any one of claims 1 to 4, further comprising a plurality of first cooling fins (32) arranged at least partially 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 convex and having a concavity oriented towards the front when considering the direction of rotation (R) of the rotor.

6. Rotor (2) according to claim 5, wherein the outer face (12) of the cylindrical body has 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 outer 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 convex 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, wherein at least a portion of the external face (12) of the cylindrical body comprises reliefs (28).

8. Rotor (2) according to claim 7, wherein the reliefs (28) comprise undulations; said undulations comprising a succession of hollows and circular curves 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 outer face (52) and an inner face (54); the outer face (52) carrying a retarder inductor (56) arranged opposite an inner face (10) of the cylindrical body; the inner face (54) carrying a generator armature (58); the rotor being formed 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) disposed opposite the inner face (54) of the stator.

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