JP3183382U - Rotor core, rotor and motor - Google Patents

Abstract

The present invention provides a rotor core or the like in which a caulking recess and a bolt hole are not formed.
In a rotor core 10 in which a plurality of magnetic thin plates 10a to 10n are laminated, the plurality of magnetic thin plates 10a to 10n of the rotor core 10 are joined together and integrated by bonding. The adhesive is a thermosetting adhesive, a thermoplastic adhesive, an elastomer adhesive, or a composite adhesive.
[Selection] Figure 1

Description

  The present invention relates to the structure of a rotor core. Furthermore, this invention relates to the rotor provided with such a rotor core, and the motor provided with such a rotor.

  The motor has a stator and a rotor arranged in the stator. These stator and rotor are formed by laminating a plurality of electromagnetic steel plates. FIG. 4 is a cross-sectional view of a stator composed of a plurality of magnetic thin plates in the prior art described in Patent Document 1. In FIG. 4, a plurality of magnetic thin plates 100 a to 100 g are stacked, whereby the stator 100 is formed.

  As can be seen from FIG. 4, a caulking protrusion 101a is formed on one surface of the magnetic thin plate 100a. A caulking recess 102a is formed on the other surface of the magnetic thin plate 100a at a position corresponding to the caulking protrusion 101a. The other magnetic thin plates 100b to 100g have the same configuration. As shown in FIG. 4, a plurality of magnetic thin plates 100a to 100g are sequentially stacked so that the caulking protrusion 101a of the magnetic thin plate 100a is press-fitted into the caulking recess 102b of the adjacent magnetic thin plate 100b. Other magnetic thin plates are laminated in the same manner, thereby forming a stator core.

  FIG. 5 is an end view of a rotor core in the prior art as described in Patent Document 2. In FIG. 5, a plurality of slots 201 are formed on the end surface of the rotor core 200. These slots 201 extend in the axial direction of the rotor core 200 and are formed at equal intervals in the circumferential direction. A magnet 202 is inserted into each slot 201.

  Further, a plurality of bolt holes 210 are formed at equal intervals in the circumferential direction on the end surface of the rotor core 200. The rotor core 200 is formed by laminating a plurality of magnetic thin plates. These magnetic thin plates are integrated with each other by tightening the tightening bolt 211 through the bolt hole 210.

Utility Model No. 63-55753 Japanese Utility Model Publication No. Sho 62-27010

  However, when the rotor core formed in this way is rotated, stress concentration during rotation occurs near the caulking recess and the bolt hole, and the strength of the rotor decreases. In particular, when the rotor is rotated at a high speed, the strength of the rotor is significantly reduced around the caulking concave portion.

  The present invention has been made in view of such circumstances, and a rotor core in which no caulking recesses and bolt holes are formed, a rotor including such a rotor core, and such a rotor. It aims at providing the motor provided with.

In order to achieve the above-described object, according to a first device, a rotor core is formed by laminating a plurality of magnetic thin plates, and the plurality of magnetic thin plates of the rotor core are integrated together by bonding. A rotor core is provided that is characterized in that
According to a second device, in the first device, the plurality of magnetic thin plates are combined and integrated with each other by a thermosetting adhesive.
According to a third device, in the first device, the plurality of magnetic thin plates are combined and integrated with each other by a thermoplastic adhesive.
According to a fourth device, in the first device, the plurality of magnetic thin plates are combined and integrated with each other by an elastomer-based adhesive.
According to a fifth aspect, in the first aspect, the plurality of magnetic thin plates are combined and integrated with each other by a composite adhesive.
According to the sixth aspect, there is provided a rotor including the rotor core according to any one of the first to fifth aspects, and a plurality of magnets arranged inside the rotor core.
According to the seventh invention, an electric motor having the rotor of the sixth invention is provided.

  In the present invention, since the plurality of magnetic thin plates are bonded to each other by bonding, it is not necessary to form a caulking recess and a bolt hole. For this reason, stress does not concentrate in a certain place at the time of rotation, and therefore the strength of the rotor core can be increased. Therefore, it is possible to further increase the maximum rotational speed of the rotor including the rotor core.

It is a perspective view of the rotor core based on this invention. FIG. 2 is an end view of a rotor including the rotor core shown in FIG. 1. It is a fragmentary sectional view of the motor containing the rotor core shown by FIG. It is sectional drawing of the laminated body which consists of a some magnetic thin plate in a prior art. It is a top view of the rotor core in a prior art.

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the following drawings, the same members are denoted by the same reference numerals. In order to facilitate understanding, the scales of these drawings are appropriately changed.
FIG. 1 is a perspective view of a rotor core according to the present invention. As shown in FIG. 1, a rotor core 10 according to the present invention is formed by laminating a plurality of magnetic thin plates 10a to 10n. In each of the magnetic thin plates 10a to 10n, a plurality of slots 21 are formed at equal intervals in the circumferential direction. In the embodiment shown in FIG. 1, eight slots 21 are formed. As shown in FIG. 1, when a plurality of magnetic thin plates 10 a to 10 n are stacked, each slot 21 extends in the axial direction of the rotor core 10.

  FIG. 2 is an end view of the motor including the rotor core shown in FIG. In FIG. 2, a magnet 22 is inserted and arranged in each of the plurality of slots 21, thereby forming a rotor 20. These magnets have the same dimensions and the same magnetic force, and extend in the axial direction of the rotor 20. An inner peripheral surface 31 of the stator 30 is shown around the rotor 20, and the rotor 20 and the stator 30 constitute a motor 40.

  FIG. 3 is a partial cross-sectional view of the rotor core shown in FIG. As shown in FIG. 3, an adhesive layer 11 exists between adjacent magnetic thin plates 10a and 10b. In other words, in the present invention, adjacent magnetic thin plates 10a and 10b are joined to each other by an adhesive. As can be seen from FIG. 3, the other magnetic thin plates 10 b to 10 n are similarly joined to each other by the adhesive layer 11. Therefore, in the present invention, all the magnetic thin plates 10a to 10n are joined by the adhesive to form the rotor core 10.

  In such a configuration, there is no need to form a caulking recess and a bolt hole as in the prior art. Therefore, stress concentration does not occur when the rotor 20 including the rotor core 10 is rotated, and the strength of the rotor core 10 can be increased.

  Further, the adhesive used for the adhesive layer 11 is preferably a thermosetting adhesive containing a thermosetting resin as a main component. In this case, the adhesive layer 11 that is insoluble and infusible can be formed by heating the adhesive. Such a thermosetting adhesive is, for example, an epoxy resin adhesive or a phenol resin adhesive.

  Alternatively, the adhesive used for the adhesive layer 11 may be a thermoplastic adhesive containing a thermoplastic resin as a main component. In this case, the adhesive layer 11 is formed by dissolving or heat-melting the adhesive in a solvent. Such a thermoplastic adhesive is, for example, an acrylic resin adhesive.

  Alternatively, the adhesive used for the adhesive layer 11 may be an elastomer-based adhesive containing a thermoplastic elastomer or the like as a main component. Such an elastomer adhesive is, for example, a silicone rubber adhesive.

  Alternatively, the adhesive used for the adhesive layer 11 may be a composite adhesive. Such a composite adhesive is, for example, a mixture of a flexible polymer such as an elastomer or a thermoplastic resin and a hard resin such as an epoxy resin or a phenol resin.

  Naturally, the case where the adhesive layer 11 is formed by an adhesive different from these adhesives is also included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Rotor core 10a-10n Magnetic thin plate 11 Adhesive layer 20 Rotor 21 Slot 22 Magnet 30 Stator 40 Motor

Claims (7)

A rotor core in which a plurality of magnetic thin plates are laminated,
The rotor core according to claim 1, wherein the plurality of magnetic thin plates of the rotor core are joined together by bonding.   2. The rotor core according to claim 1, wherein the plurality of magnetic thin plates are combined and integrated with each other by a thermosetting adhesive.   2. The rotor core according to claim 1, wherein the plurality of magnetic thin plates are joined and integrated with each other by a thermoplastic adhesive.   2. The rotor core according to claim 1, wherein the plurality of magnetic thin plates are combined and integrated with each other by an elastomer-based adhesive.   2. The rotor core according to claim 1, wherein the plurality of magnetic thin plates are combined and integrated with each other by a composite adhesive. The rotor core according to any one of claims 1 to 5,
A rotor comprising a plurality of magnets arranged inside the rotor core.   An electric motor having the rotor according to claim 6.

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