JP7049935B2 - Rotor end plate, rotor and rotary machine - Google Patents

Description

Embodiments of the present invention relate to a rotor end plate, a rotor and a rotary electric machine.

The augmentation method may be used as a method for adjusting the balance of a permanent magnet synchronous motor. In the increase method, the balance adjustment is performed by caulking and fixing the balance adjustment weight to the protrusion provided on the rotor end plate. Here, in order to fit and fix the rotor end plate to the rotating shaft of the rotor made of steel, a ring-shaped metal fitting made of steel is provided at the center of the disk made of aluminum. (Patent Document 1).

Japanese Unexamined Patent Publication No. 2012-165534

However, in the above configuration, peeling occurs between the disk portion and the metal fitting in the direction parallel to the rotation center axis of the rotor and in the rotation direction of the rotor, whereby the rotor end plate holding the rotor is formed. There is a risk of collapse.

Therefore, a rotor end plate, a rotor, and a rotary electric machine in which peeling between the disk portion and the metal fitting is suppressed are provided.

The rotor end plate according to the embodiment includes a disk portion and a filling metal, and the filling metal portion has a flat surface portion and a side surface portion, and has a disk shape having a through hole in the central portion. Is provided with a recessed portion in the axial direction, a groove portion recessed in the radial direction is provided on the side surface portion so as to form a string, and the metal constituting the disk portion is embedded in the recessed portion and the groove portion. ing.

Partially broken perspective view showing the schematic configuration of the rotary electric machine according to the embodiment. A vertical sectional view showing a schematic configuration of a rotor and a rotating shaft. Perspective view showing the schematic configuration of the rotor end plate Plan view showing the schematic configuration of the rotor end plate Vertical cross-sectional view showing the schematic configuration of the rotor end plate Enlarged vertical cross-sectional view showing the schematic configuration of the recess and the groove

Hereinafter, embodiments will be described with reference to the drawings. In the following description, the direction parallel to the rotation center axis O of the rotor is referred to as an axial direction. Further, the direction in which the rotation center axis O is coaxially rotated with respect to the rotation center axis O is referred to as a circumferential direction. Further, the direction perpendicular to the rotation center axis O is referred to as a radial direction.

FIG. 1 is a partially broken perspective view showing a schematic configuration of a rotary electric machine according to an embodiment. FIG. 2 is a vertical sectional view showing a schematic configuration of a rotor and a rotating shaft. FIG. 3 is a perspective view showing a schematic configuration of the rotor end plate, FIG. 4 is a plan view and is a view seen from the arrow direction of FIG. 5, and FIG. 5 is taken along the ABCOD line in FIG. It is a vertical cross-sectional view of the part. FIG. 6 is an enlarged vertical sectional view showing a schematic configuration of the recess 16a and the groove 16b.

As shown in FIG. 1, the rotary electric machine 1 includes a housing 2, a stator 3, and a rotor 4. The housing 2 includes a frame 5 and bearing brackets 6 and 7. The frame 5 has a substantially cylindrical shape having openings 5a and 5b on both sides, and the openings 5a and 5b are closed by disk-shaped bearing brackets 6 and 7.

Each of the bearing brackets 6 and 7 is provided with through holes 6a and 7a in the central portion, and bearing portions 6b and 7b are provided around the through holes 6a and 7a so as to form a part of the through holes 6a and 7a. Has been done. The rotating shaft 9 of the rotor 4, which will be described later, is rotatably fixed by the bearing portions 6b and 7b so as to pass through the through holes 6a and 7a. The stator 3 includes a stator core 3a and a winding 8, and is fixed in the housing 2.

As shown in FIG. 2, the rotor 4 includes a rotor core 4a. The rotor core 4a is formed by, for example, laminating a plurality of disk-shaped electromagnetic steel sheets. Further, the soft magnetic powder may be formed by pressure molding. A magnet hole 4b is provided in the rotor core 4a, and a permanent magnet 4c is embedded in the magnet hole 4b. Both ends of the rotor core 4a in the axial direction are sandwiched and fixed by end plates 10, thereby forming a cylindrical rotor 4.

The end plate 10 is configured to include a disk portion 14 and a filling metal 16, and the disk portion 14 and the filling metal portion 16 are integrally joined and arranged coaxially with the rotation center axis O in common. A through hole 12 is provided in the center of the end plate 10, and a filling metal 16 is provided around the through hole 12. A disk portion 14 is closely and integrally provided on the outer periphery of the filling metal 16 and one surface in the axial direction, and constitutes a disk-shaped end plate 10 having a through hole 12 in the center as a whole. There is.

As shown in FIGS. 3 to 5, a through hole 4d is provided in the central portion of the rotor 4 and communicates with the through hole 12 provided in the central portion of the end plate 10. The rotating shaft 9 penetrates the through holes 4d and 12, and is firmly fitted to the filling metal 16 and the rotor core 4a in the through holes 12 by shrink fitting, press fitting, or the like, so that the rotating shaft 9 is displaced in the axial direction and the rotating direction. It is fixed to the end plate 10 and the rotor core 4a so as not to move. The flat surface portion 16f, which is the axial surface of the end plate 10, is provided with a protrusion 10a for adjusting the balance of the rotor 4 by an increasing method.

4 and 5 show the detailed configuration of the end plate 10. The end plate 10 has a through hole 12 at the center thereof and has a disk shape as a whole, and a filling metal 16 is provided facing the through hole 12. The end plate 10 is formed by forming the filling metal 16 with, for example, a metal casting, that is, die-casting. The portion of the end plate 10 other than the filling metal 16 is composed of a disk-shaped metal portion.

Hereinafter, the disk-shaped metal portion of the end plate 10 other than the filling metal 16 is referred to as a disk portion 14, and the metal is referred to as a first metal. The first metal is, for example, aluminum or an aluminum alloy. Further, the filling metal 16 is made of a metal different from the first metal (hereinafter, referred to as a second metal), and the second metal is made of, for example, iron, that is, a steel material.

The filling metal 16 is provided with a recess 16a and a groove portion 16b. The recess 16a is provided in the axially flat surface portion 16f of the filling metal 16, and in the embodiment, an example in which six recesses 16a arranged in the circumferential direction are provided in this planar shape is shown. The concave portion 16a has a U-shaped shape having a curvature when viewed from the axial direction, and the concave portion having a U-shaped cross section extends in the axial direction. The inside of the recess 16a has a curvature and is rounded, and is configured so that at least an acute-angled corner is not formed. The inside of the recess 16a is embedded with the metal constituting the disk portion 14.

The groove portion 16b is provided on a surface perpendicular to the axial direction of the filling metal 16, that is, a side surface portion 16c, and in the embodiment, an example in which three groove portions 16b are provided in the circumferential direction is shown. The groove portion 16b is configured by providing a groove portion on the side surface portion 16c of the metal fitting 16 having a disk shape so as to draw a string. The cross section of the groove portion 16b constitutes a concave portion having a U-shaped curvature. The inside of the groove portion 16b has a curvature and is rounded, and is configured so that there are at least no acute-angled corners. The inside of the groove portion 16b is embedded with the metal constituting the disk portion 14.

The end plate 10, the rotor 4, and the rotary electric machine 1 according to the embodiment have the following effects.
The end plate 10 that sandwiches and fixes the rotor core 4a of the rotor 4 is composed of a filling metal 16 and a disk portion 14, and has a disk shape as a whole. The filling metal 16 is provided at the center of the end plate 10 and is fixed in contact with the rotating shaft 9.

The filling metal 16 includes a recess 16a provided in the flat surface portion 16f in the axial direction and a groove portion 16b provided in the side surface portion 16c in the radial direction. The concave portion 16a extends in the axial direction, and the inside thereof is a concave portion having a curvature and rounded round. The metal constituting the disk portion 14 is contained in the recess 16a. As a result, it is possible to prevent the filling metal 16 and the disk portion 14 from being peeled off to form a gap or to be displaced in the circumferential direction.

The groove portion 16b is provided on the side portion in the direction perpendicular to the axial direction of the filling metal 16, that is, in the radial direction. The groove portion 16b is elongated in the radial direction, and the inside thereof is a rounded groove portion having a curvature. The metal constituting the disk portion 14 is embedded in the groove portion 16b. As a result, it is possible to prevent the filling metal 16 and the disk portion 14 from being peeled off to form a gap or being displaced in the axial direction.

From the above, since it is suppressed that the filling metal 16 and the disk portion 14 are peeled off to form a gap or to be displaced in the axial direction and in the direction perpendicular to the axial direction, the pull-out in the axial direction is suppressed and the rotation is suppressed. Slip in the direction is suppressed.

Further, the insides of the recess 16a and the groove 16b are rounded with a curvature, and are configured so that there are no acute-angled corners. As a result, it is possible to prevent a gap from being created between the metal constituting the disk portion 14 embedded in the recess 16a and the groove 16b and the inner wall of the recess 16a and the groove 16b. Therefore, it is possible to suppress the occurrence of corrosion due to the air layer existing in the gap.

(Modification example)
As shown in FIG. 6, the recess 16a and the groove 16b include an inlet portion 16d and a recess inside 16e. The recess forming the recess 16a or the groove 16b becomes wider in the direction in which the recess 16a or the recess 16b extends from the inlet 16d, that is, in the axial direction in the case of the recess 16a and in the radial direction in the case of the groove 16b. Can be configured as follows. That is, the recess 16a can have a tapered shape in which the diameter of the inside 16e of the recess 16e is large in the axial direction from the inlet portion 16d.

The groove portion 16b can have a tapered shape in which the dimension of the inside of the recess 16e is large in the radial direction from the inlet portion 16d. With this configuration, since the diameter of the inlet portion 16d is smaller than the diameter of the recess inside 16e, it is possible to prevent the metal constituting the disk portion 14 embedded in the recess 16a from coming off in the axial direction.

Further, since the groove portion 16b is profitable in the radial direction from the inlet portion 16d provided on the side surface portion 16c of the disk portion 14, the metal constituting the disk portion 14 embedded in the recess inside 16e is recessed. It fits into the shapes of the 16a and the groove 16b, and is prevented from coming out of the recess 16a or the groove 16b of the metal constituting the disk portion 14. Further, since the groove portion 16b is configured to form the strings of the end plate 10, slipping in the circumferential direction, that is, the rotational direction is suppressed.

Here, the shape of the recess 16a seen from the axial direction may be not only a round shape but also a polygonal shape such as a triangle or a square, or another shape.
In the embodiment, an example in which the filling metal 16 is provided with six recesses 16a is illustrated, but there is no intention of limiting this, and any number can be used. Further, in the embodiment, an example in which the three groove portions 16b are provided is illustrated, but there is no intention of limiting the number thereof, and any number can be used.

As described above, some embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and variations thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 ... Rotor machine, 3 ... Stator, 3a ... Stator iron core, 4 ... Rotor, 4a ... Rotor iron core, 9 ... Rotating shaft, 10 ... End plate, 14 ... Disc part (first metal part), 16 ... Filling metal (second metal part), 16a ... recess, 16b ... groove, 16c ... side surface, 16d ... entrance, 16e ... inside the depression, 16f ... flat surface

Claims (8)

In the rotor end plate provided with the disk part and the filling metal,
The filling metal has a flat surface portion and a side surface portion, and has a disk shape having a through hole in the central portion.
The flat surface portion is provided with a concave portion recessed in the axial direction, and the side surface portion is provided with a groove portion recessed in the radial direction so as to form a string.
A rotor end plate in which a metal constituting a disk portion is embedded in the recess and the groove portion. The rotor end plate according to claim 1, wherein there is no acute-angled corner inside the recess constituting the recess. The rotor end plate according to claim 1 or 2, wherein there is no acute-angled corner inside the recess constituting the groove. The rotor end plate according to any one of claims 1 to 3, wherein the recess has an inlet portion and the inside of the recess, and the diameter inside the recess is larger than the diameter of the inlet portion. The rotor end plate according to any one of claims 1 to 4, wherein the metal constituting the disk portion and the metal constituting the filling metal are different. The rotor end plate according to claim 5, wherein the disk portion is made of aluminum and the filling metal is made of iron. A rotor configured with the rotor end plate according to any one of claims 1 to 6. A rotary electric machine including the rotor according to claim 7.

Images