JP2020028135A - Rotor core plate, rotor core, rotor, rotor manufacturing method and rotary machine - Google Patents

Abstract

To provide a rotor core capable of reducing stress to a component and preventing deformation of the rotor core when a rotor is manufactured, specifically, when a shaft is press-fitted to the rotor core.SOLUTION: In a rotor core plate 5, a notch 3 is formed only in one place of an inner diameter side. A large number of rotor core plates 5 are laminated, a rotor core is formed, the rotor core is press-fitted to a shaft and a rotor is formed. A slight expansion to a circumferential direction occurs in the notch 3 by press-fitting stress in a press-fitted state to the shaft, and the expansion absorbs the press-fitting stress. Thus, in a shape as the entire rotor core plate 5, deformation is reduced or deformation is prevented.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotor core plate, a rotor core, a rotor, a rotor manufacturing method, and a rotating machine, and more particularly to a technique for manufacturing a rotor core (armature) of a rotating machine such as a motor.

In the process of manufacturing the rotating machine, the manufacture of the rotor core is performed by laminating a plurality of rotor core plates. The rotor core is pressed into the shaft to form a rotor.
FIG. 6 is an explanatory diagram conceptually showing deformation occurring when the rotor core is pressed into the shaft (therefore, the diagram is deformed, and there is no actual elliptical shaft). As shown in the figure, when the formed rotor core 610 is pressed into the shaft 612, stress is applied to each component, and the rotor core 610 is slightly deformed. Further, when the deformation occurs, the degree of the deformation is not uniform in the rotor core 610, and the deformation may be biased.

  Now, as for the rotor core manufacturing technique, technical proposals have been made by patent applications and the like. For example, Patent Document 1 listed below discloses an armature in which a plurality of core sheets having the same shape are axially stacked while being rotated at equal angles in the circumferential direction, as an armature that hardly causes magnetic saturation in the armature core. In the axial press-fitting holes formed in each core sheet, a plurality of concave portions that are depressed radially outward are formed at equal intervals in the circumferential direction, and the rotation lamination angle of each core sheet is set to an angle smaller than the angular interval between the concave portions. A configuration is disclosed in which the center line in the circumferential direction of each concave portion is set at a position shifted in the circumferential direction with respect to the minimum diameter portion of the base portion.

Japanese Patent Application Laid-Open No. 2015-6094, "Armature and Motor"

  The above-mentioned stress applied to the components when the rotor core is pressed into the shaft, deformation of the rotor core, and occurrence of the bias of the deformation are not preferable in order to achieve higher performance of the rotating machine. Therefore, the problem to be solved by the present invention is to eliminate the problems of the prior art, to reduce the stress on the parts during the manufacture of the rotor, particularly at the time of press-fitting the rotor core to the shaft, and to reduce the deformation of the rotor core. It is to provide technology that can do.

  As a result of studying the above problem, the present inventor has provided a notch on the inner diameter side of the rotor core plate so that the notch is widened at the time of press-fitting, and the rotor core plate is stacked while shifting the angle by rolling. The inventors have found that they can be solved, and based on this, have completed the present invention. That is, the invention claimed in the present application as a means for solving the above-mentioned problem, or at least the disclosed invention is as follows.

[1] A rotor core plate for constituting a rotor core of a rotating machine, wherein a notch is provided only at one position on an inner diameter side.
[2] A rotor core obtained by laminating the rotor core plates according to any one of [1], wherein the cutout portions are laminated at different angles.
[3] The rotor core according to [2], wherein the cutouts are stacked at a constant angle while continuously changing the angle.

[4] A rotor comprising the rotor core according to any one of [2] and [3].
[5] A rotating machine comprising the rotor according to [4].
[6] A method of manufacturing a rotor of a rotating machine, wherein a rotor core plate provided with a cutout portion only at one position on the inner diameter side is rolled, so that the cutout portion is provided for each rotor core plate. Characterized in that the method comprises a rolling process of obtaining a laminated rotor core at different angles.

  Since the rotor core plate, the rotor core, the rotor, the rotor manufacturing method, and the rotating machine of the present invention are configured as described above, according to these, the notch portion of the rotor core plate expands when the rotor core is pressed into the shaft, Stress on components due to press fitting is reduced, and deformation of the rotor core is reduced. Further, according to the rotor core and the like of the present invention, since the rotor core plates are laminated while the angular position of the notch portion is changed by rolling, the deformation of the rotor core can be reduced from being biased in one direction, and the deformation due to press fitting can be reduced. The rotor can be balanced without being biased in the direction.

  In the present invention, only one cutout portion for absorbing stress is provided. However, with such a configuration, the portion for absorbing stress is specified only at one location, and at the same time, the shape is balanced. There may be only one part that does not exist. Therefore, it becomes easy to balance between the rotor core plates and the intended balance in the final rotor core at the time of rolling. That is, it is possible to easily control the balance and the design of the balance. On the other hand, if the configuration is provided at a plurality of locations at equal intervals, it is not possible to control the balance design as in the present invention.

It is a top view showing the example of composition of the rotor core board of the present invention. FIG. 4 is an explanatory plan view illustrating an example of a shape of a cutout portion in the rotor core plate of the present invention. It is a perspective explanatory view showing the lamination method of the rotor core board of the present invention. FIG. 4 is an explanatory plan view from one end of a rotor core formed according to FIG. 3. It is a perspective explanatory view of the formed rotor. It is explanatory drawing which shows notionally deformation at the time of press-fitting a rotor core to a shaft.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a plan view showing a configuration example of a rotor core plate of the present invention. In the figure, (a) shows the form before press-fitting to the shaft, and (a ') shows the form after press-fitting. As shown in the drawing, the rotor core plate 5 has a characteristic configuration in which the notch 3 is provided only at one location on the inner diameter side. A large number of rotor core plates 5 are laminated to form a rotor core, and the rotor core is pressed into a shaft to form a rotor. In the state (a ') in which the shaft is press-fitted, the notch 3 slightly expands in the circumferential direction due to the press-fit stress, but this absorbs the press-fit stress. Therefore, the shape of the rotor core plate 5 as a whole is reduced or prevented from being deformed.

  FIG. 2 is an explanatory plan view showing an example of the shape of the notch in the rotor core plate of the present invention. As shown in the figure, the shape of the notch 3a and the like of the present rotor core plate is not particularly limited, and the notch 3a is an arc-shaped notch (a in the figure) and the notch 3b is a triangle. )), A notch on the rectangle ((c) in the figure), and any other shape as long as the press-fit stress can be absorbed.

  FIG. 3 is a perspective explanatory view showing a method of laminating the rotor core plate of the present invention. In the figure, (i) to (iii) show the process of laminating the rotor core plates. FIG. 4 is an explanatory plan view from one end of the rotor core formed in FIG. 3, and FIG. 5 is a perspective explanatory view of the formed rotor. As shown in FIGS. 3 and 4, the rotor core plates 5, 5,... Are stacked by changing the angles of the notches 3, 3,. Is done.

  As shown in FIG. 4, the present rotor core 10 may have a configuration in which the notches 3, 3,... Such a configuration can be easily formed by rolling and rolling (changing the angle) every single rotor core plate 5. Conventionally, rolling is used to reduce the unevenness of the thickness of each rotor core plate, but in the present invention, this is achieved by arranging specific portions such as notches 3, 3,... In a well-balanced manner. It is also used as a stacking technique.

  The angle changed by the transposition is not particularly limited, but is preferably a constant angle such as 45 ° or 30 ° for controlling the balance. FIG. 4 shows a case where the transposition is performed at a fixed angle of 45 ° or 135 °. Further, a method of forming a rotor core by such a rolling process and a method of manufacturing a rotor including the same are also within the scope of the present invention.

  In FIG. 5, there is a black portion (3) on the surface of the formed rotor core 10, which shows the position of the notch 3 from the outside for convenience. Therefore, the configuration is not necessary as an actual form, but such a form is also within the scope of the present invention. Further, a rotor 20 having the rotor core described above and a rotating machine (not shown) configured using the rotor 20 are also within the scope of the present invention.

  According to the rotor core plate, the rotor core, the rotor, the rotor manufacturing method, and the rotating machine of the present invention, when the rotor core is press-fitted to the shaft, the notch of the rotor core plate is widened, so that stress on parts due to press-fitting is reduced, and the rotor core is Deformation is reduced. Further, the deformation due to the press-fitting is not biased in one direction, and the rotor can be balanced. Therefore, the present invention is industrially highly applicable in the rotating machine manufacturing field and all related fields.

3, 3a, 3b, 3c Notch 5 Rotor core plate 10 Rotor core 12 Shaft 20 Rotor 610 Rotor core 612 Shaft

Claims (6)

A rotor core plate for forming a rotor core of a rotating machine, wherein a notch is provided only at one position on an inner diameter side. A rotor core comprising the rotor core plates according to claim 1 stacked, wherein the notch portions are stacked at different angles. 3. The rotor core according to claim 2, wherein the notches are stacked at a constant angle and continuously changing angles. 4. A rotor comprising the rotor core according to claim 2. A rotating machine comprising the rotor according to claim 4. A method of manufacturing a rotor of a rotating machine, wherein a notch is provided at only one position on an inner diameter side, and the notch is formed by rolling the rotor core plate so that the angle of the notch is changed for each rotor core plate. A method for manufacturing a rotor, comprising: a rolling process for obtaining a laminated rotor core.