JP2013158223A - Rotor of reluctance motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further simplify the structure supporting a lamination core in a rotor of a reluctance motor having the lamination core formed by laminating multiple magnetic steel sheets where flux barriers composed of cavities are formed.SOLUTION: A rotor of a reluctance motor of this invention includes first plate-like members and second plate-like members. Each first plate like member is a magnetic steel sheet where a flux barrier composed of a cavity is formed. The multiple first plate like members are aligned in a predetermined lamination direction. Each second plate like member is a magnetic steel sheet where the flux barrier is not formed. The second plate like members are provided at the outermost positions in the lamination direction.

Description

  The present invention relates to a rotor of a reluctance motor.

  As a rotor of a reluctance motor, a number of so-called “laminated cores” in which a large number of electromagnetic steel sheets having a flux barrier composed of air gaps (for example, through holes and slits) are laminated have been proposed (for example, Japanese Patent Laid-Open No. Hei 11- No. 215750, JP-A No. 2002-136003, JP-A No. 2003-52156, etc.). In the rotor having such a configuration, an end plate is provided outside the laminated core in the lamination direction of the electromagnetic steel plates so as to sandwich the laminated core.

  In such a conventional rotor, an electromagnetic force is generated that deforms the end of the electromagnetic steel sheet in the stacking direction so as to open outward in the stacking direction. Such an electromagnetic force is generated when magnetic flux leakage along the stacking direction occurs at the end of the stacked core. For this reason, in such a conventional rotor, in order to suppress the above-described deformation of the electromagnetic steel sheet at the end in the stacking direction, the structure for supporting the stacked core (including the end plate), It was necessary to provide high rigidity and spring elasticity that can counter the electromagnetic force described above. The present invention has been made to cope with such a problem.

<Configuration>
The rotor of the reluctance motor according to the present invention includes a first plate member and a second plate member. The first plate-like member is an electrical steel sheet in which a flux barrier composed of a gap (a slit, a through hole, or a notch) is formed. In the present invention, the plurality of first plate-like members are arranged in a predetermined stacking direction. The second plate-like member is an electromagnetic steel plate in which the flux barrier is not formed, and is provided at the outermost position in the stacking direction.

  That is, the second plate-like member and the plurality of first plate-like members are laminated in this lamination direction in this order. In other words, the second plate-shaped member is the outermost layer in the stacking direction in the stacked core formed by stacking the second plate-shaped member and the plurality of first plate-shaped members in the stacking direction. In the position.

<Action and effect>
In such a configuration, the laminated core formed by laminating the second plate-like member and the plurality of first plate-like members in the laminating direction, and provided at the outermost position in the laminating direction. A magnetic path is formed in the second plate member. Thereby, the occurrence of magnetic flux leakage at the end in the stacking direction of the stacked core is satisfactorily mitigated, and an electromagnetic force ( An electromagnetic force that causes the second plate-like member to be adsorbed to a stack of the plurality of first plate-like members is generated.

  For this reason, in such a configuration, the second plate-like member and the first plate-like member adjacent thereto are favorably prevented from being deformed toward the outside in the stacking direction. Therefore, according to such a configuration, the structure for supporting the laminated core can be further simplified.

1 is a partial cross-sectional view illustrating a schematic configuration of a reluctance motor to which an embodiment of the present invention is applied. (I) is the sectional side view which expanded a part of rotor shown by FIG. (Ii) is a side sectional view showing a conventional configuration as a comparative example. It is a perspective view which shows schematic structure of the modification of the rotor shown by FIG.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, as will be described later, it is quite natural that the present invention is not limited to the specific configurations of the embodiments described below. Various modifications (modifications) that can be made to the present embodiment are inserted in the description of the embodiment, so that understanding of the consistent description of the embodiment is hindered. Has been.

<Configuration>
FIG. 1 is a partial cross-sectional view showing a schematic configuration of a reluctance motor 1 to which an embodiment of the present invention is applied. Referring to FIG. 1, the reluctance motor 1 includes a stator 2 and a rotor 3.

  In the present embodiment, the reluctance motor 1 has a so-called inner rotor type configuration. That is, the stator 2 is formed in a substantially ring shape in plan view. The rotor 3 is provided so as to be rotatable relative to the stator 2 in a space inside the stator 2.

  (I) in FIG. 2 is an enlarged side sectional view of a part of the rotor 3 shown in FIG. Hereinafter, referring to FIG. 1 and FIG. 2 (i), the rotor 3 in the present embodiment includes a laminated core 30. The laminated core 30 has a structure in which a large number of inner core plates 31 and a pair of outer core plates 32 are laminated. The inner core plate 31 and the outer core plate 32 are formed of electromagnetic steel plates.

  A flux barrier 311 is formed at a position facing the stator 2 in the inner core plate 31 corresponding to the “first plate member” of the present invention. In the present embodiment, the flux barrier 311 is formed in an arcuate slit shape in plan view. The inner core plate 31 has a multilayer (four layers in the example of FIG. 1) flux barrier structure. That is, a plurality of (four in the example of FIG. 1) flux barriers 311 having different arc lengths are arranged concentrically.

  The plurality of inner core plates 31 having the flux barrier 311 are arranged in a stacking direction parallel to the rotation center axis of the reluctance motor 1. And the outer core board 32 which is an electromagnetic steel plate in which the above-mentioned flux barrier 311 is not formed is arrange | positioned further outside in the above-mentioned lamination direction rather than the laminated body of the several inner core board 31. FIG. That is, the outer core plate 32 corresponding to the “second plate-like member” of the present invention is provided at the outermost position of the laminated core 30 in the above-described lamination direction. As described above, in the present embodiment, the pair of outer core plates 32 are provided at the upper end and the lower end in FIG.

<Action and effect>
As shown in FIG. 2 (ii), in the conventional configuration that does not have the outer core plate 32, leakage of magnetic flux at the end in the stacking direction of the stacked body of the inner core plate 31 occurs (in the drawing). (See dashed arrow). As a result, an electromagnetic force that biases the inner core plate 31 at the end in the stacking direction to the outside in the stacking direction is generated (see the solid line arrow in the figure).

  On the other hand, as shown in (i) in FIG. 2, in the configuration of the present embodiment, in the laminated core 30 formed by laminating the outer core plate 32 and the plurality of inner core plates 31, A magnetic path is formed in the outer core plate 32 provided at the outermost position in the stacking direction (see the broken line arrow in the figure). Thereby, the occurrence of leakage of the magnetic flux at the end portion in the stacking direction of the stacked core 30 is satisfactorily mitigated. Further, as indicated by solid arrows in the figure, an electromagnetic force that urges the outer core plate 32 inward in the stacking direction (the outer core plate 32 is attracted to the stacked body of the plurality of inner core plates 31). Electromagnetic force) is generated.

  As described above, in the configuration of the present embodiment, the outer core plate 32 and the inner core plate 31 adjacent thereto are favorably prevented from being deformed toward the outside in the stacking direction. Therefore, according to this configuration, the structure for supporting the laminated core 30 can be further simplified. Specifically, the end plate adjacent to the outer side in the stacking direction with respect to the stacked core 30 may be omitted. Alternatively, in the case where such an end plate is provided, in the structure that supports the laminated core 30 including the end plate, the electromagnetic generated toward the outside in the laminating direction as shown in (ii) in FIG. There is no need for special means to counter the force.

<List of examples of modification>
Note that, as described above, the above-described embodiments are merely examples of typical embodiments of the present invention that the applicant has considered to be the best at the time of filing of the present application. Therefore, the present invention is not limited to the above-described embodiment. Therefore, it goes without saying that various modifications can be made to the above-described embodiment within the scope not changing the essential part of the present invention.

  Hereinafter, some typical modifications will be exemplified. In the following description of the modification, components having the same configurations and functions as the components in the above-described embodiment are given the same name and the same reference numerals in this modification. And about description of the said component, description in the above-mentioned embodiment shall be used suitably in the range which is not inconsistent.

  Needless to say, the modifications are not limited to those listed below. In addition, a plurality of modified examples can be applied in a composite manner as appropriate within a technically consistent range. The present invention (especially, the functional elements of the constituent elements constituting the means for solving the problems of the present invention is expressed functionally or functionally) is based on the description of the above-described embodiment and the following modifications. Should not be interpreted as limited. Such a limited interpretation is unacceptable and improper for imitators, while improperly harming the applicant's interests (rushing to file under a prior application principle).

  The present invention is not limited to the inner rotor type configuration. That is, the present invention can be similarly applied to a rotor in a so-called outer rotor type reluctance motor. There is no particular limitation on the number and structure (including shape) of the flux barrier 311.

  FIG. 3 is a perspective view showing a schematic configuration of a modification of the rotor 3 shown in FIG. In the figure, (i) shows the entire laminated core 30, and (ii) shows a state in which the outer core plate 32 is removed from the laminated core 30. As shown in FIG. 3, the laminated inner core 312, which is a laminated body of a plurality of inner core plates, may be formed in a gear shape in a plan view. That is, in this case, the inner core plate has a flux barrier 311 provided as a notch for imparting magnetic saliency to the end. Even in such a configuration, the same operations and effects as those of the above-described embodiment can be obtained.

  Other modifications not specifically mentioned are naturally included in the scope of the present invention as long as they do not change the essential part of the present invention.

  In addition, the elements that are functionally or functionally expressed in the elements constituting the means for solving the problems of the present invention are the specific structures disclosed in the above-described embodiments and modifications. Any structure capable of realizing the action or function is included. Furthermore, the contents (including the specification and the drawings) of each publication cited in the present specification can be appropriately incorporated as constituting a part of the present specification within a technically consistent range.

DESCRIPTION OF SYMBOLS 1 ... Reluctance motor 2 ... Stator 3 ... Rotor 30 ... Laminated core 31 ... Inner core board 311 ... Flux barrier 312 ... Laminated inner core 32 ... Outer core board

Japanese Patent Laid-Open No. 11-215750 JP 2002-136003 A JP 2003-52156 A

Claims (1)

A magnetic steel sheet in which a flux barrier composed of voids is formed, arranged in a predetermined stacking direction, a plurality of first plate-like members,
The magnetic steel sheet in which the flux barrier is not formed, provided at the outermost position in the stacking direction, a second plate-like member,
Are laminated in the laminating direction, the rotor of a reluctance motor.

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