Rotor

Abstract

Wire is suitably arranged on the outer surface of the rotor core. [Solution] The rotor comprises a rotor core made of a magnetic material and an outer reinforcing wire spirally wound around the outer surface of the rotor core. The outer reinforcing wire is made of a stranded wire formed by bundling together a plurality of fine wires. This rotor structure provides a structure in which multiple layers of fine wires are laminated on the outer surface of the rotor core. Therefore, the rotor can be suitably reinforced. In addition, since the fine wires are bundled together as a stranded wire, it is possible to prevent each fine wire from unraveling.

Description

Technical Field

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[0001] The technology disclosed in this specification relates to a rotor.

[0002] The rotor disclosed in Patent Document 1 has a wire wound around the outer peripheral surface of a rotor core. The rotor core is reinforced by the wire.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When a wire is wound around the outer peripheral surface of a rotor core in multiple layers, winding collapse may occur. This specification proposes a technology for suitably arranging a wire on the outer peripheral surface of a rotor core.

Means for Solving the Problems

[0005] The rotor disclosed in this specification includes a rotor core made of a magnetic material and an outer peripheral reinforcing wire wound around the outer peripheral surface of the rotor core in a helical shape. The outer peripheral reinforcing wire is composed of a stranded wire formed by bundling a plurality of thin wires.

[0006] In this rotor, since the outer peripheral reinforcing wire composed of a stranded wire formed by bundling a plurality of thin wires is wound around the outer peripheral surface of the rotor core, a structure in which the thin wires are laminated on the outer peripheral surface of the rotor core in multiple layers is realized. Further, since the thin wires are bundled as a stranded wire, each thin wire is prevented from coming apart due to winding collapse or the like. Therefore, the rotor core can be effectively reinforced by the outer peripheral reinforcing wire.

Brief Description of the Drawings

[0007] [Figure 1]Side view of the rotor in the embodiment. [Figure 2] Partial cross-sectional view of the outer perimeter reinforcing wires. [Figure 3] Partial cross-sectional view of the rotor [Modes for carrying out the invention]

[0008] The rotor 10 in the embodiment shown in Figure 1 is used by being positioned inside the stator of a motor. The rotor 10 rotates around the rotation axis AX. The rotor 10 has a shaft 20, a rotor core 30, and an outer reinforcing wire 70.

[0009] The shaft 20 has a cylindrical shape concentric with the rotating shaft AX and functions as the output shaft of the motor.

[0010] The rotor core 30 is made of a magnetic material having high magnetic permeability (e.g., a soft magnetic material, a hard magnetic material, etc.). For example, the rotor core 30 may be made of multiple electromagnetic steel sheets stacked in the axial direction. The rotor core 30 has a cylindrical shape. The rotor core 30 is fixed to the shaft 20 concentrically with the rotation axis AX. Although not shown, multiple permanent magnets are fixed inside the rotor core 30. The rotor core 30 has an outer circumferential surface concentric with the rotation axis AX.

[0011] The outer reinforcing wire 70 is wound spirally around the outer surface of the rotor core 30. The outer reinforcing wire 70 is wound around the rotor core 30 in such a way that tension is applied to it. The outer reinforcing wire 70 is wound around the outer surface of the rotor core 30 over a wide area from near one end face to near the other end face. As shown in Figure 2(a), the outer reinforcing wire 70 is made up of stranded wires formed by bundling multiple thin wires 72. Each thin wire 72 is made of a magnetic material. As shown in Figure 3, the outer reinforcing wire 70 is wound so as to form a single layer on the outer surface of the rotor core 30. Therefore, the thin wires 72 are layered on the outer surface of the rotor core 30.

[0012] When the rotor 10 rotates, centrifugal force is applied to the rotor core 30. The deformation of the rotor core 30 is suppressed because the outer reinforcing wire 70 is wound around the outer surface of the rotor core 30. In particular, since the fine wires 72 are layered on the outer surface of the rotor core 30, the rotor core 30 is strongly reinforced. Therefore, deformation of the rotor core 30 due to centrifugal force is effectively suppressed. Furthermore, since the outer reinforcing wire 70 is made of a magnetic material, high magnetic properties can be obtained in the rotor 10.

[0013] In addition, there is a technique for layering fine wires 72 on the outer surface of the rotor core 30, in which thin single wires 72 are wound in multiple layers on the outer surface of the rotor core 30. However, in this technique, fine wires 72 can get caught between the fine wires 72 below them, or between the electromagnetic steel sheets that make up the rotor core 30, resulting in problems such as the fine wires 72 becoming disorganized or their distribution becoming irregular. In contrast, in the rotor 10 of this embodiment, stranded wires made by bundling multiple fine wires 72 are wound around the outer surface of the rotor core 30 as outer reinforcing wires 70, so the fine wires 72 are bundled together and their unraveling is prevented. Therefore, the disorganization of the fine wires 72 can be prevented. As a result, the fine wires 72 are wound regularly on the outer surface of the rotor core 30 and are densely arranged. Therefore, the rotor 10 can be effectively reinforced and the magnetic properties of the rotor 10 can be effectively improved. Furthermore, the regular distribution of the thin wires 72 improves the dimensional accuracy of the outer diameter of the rotor 10, making it possible to narrow the gap between the rotor 10 and the stator, thereby improving the performance of the motor. In addition, since the rotor 10 can be manufactured by winding only one layer of outer reinforcing wire 70, the manufacturing cost of the rotor 10 can be reduced.

[0014] In the above embodiment, the outer reinforcing wire 70 was wound around the outer surface of the rotor core 30 in only one layer, but the outer reinforcing wire 70 may be wound around the outer surface of the rotor core 30 in two or more layers. Even in this case, winding collapse can be suppressed compared to winding a single thin wire 72 of the same thickness.

[0015] Furthermore, as shown in Figure 2(b), a stranded wire that has been pressure-molded to have a square cross-section may be used as the outer reinforcing wire 70. With this configuration, the occupancy rate of the fine wires 72 on the outer surface of the rotor core 30 can be increased, and the strength and magnetic properties of the rotor core 30 can be improved more effectively.

[0016] Although embodiments have been described in detail above, these are merely illustrative and do not limit the scope of the claims. The technologies described in the claims include various modifications and changes to the specific examples illustrated above. The technical elements described in this specification or drawings exhibit technical usefulness individually or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Furthermore, the technologies illustrated in this specification or drawings achieve multiple objectives simultaneously, and achieving even one of these objectives constitutes technical usefulness. [Explanation of Symbols]

[0017] 10: Rotor, 20: Shaft, 30: Rotor core, 70: Outer perimeter reinforcing wire, 72: Thin wire

Claims

[Claim 1] It is a rotor, A rotor core made of magnetic material, Outer reinforcing wire material wound helically around the outer surface of the rotor core, It has, The outer reinforcing wire is composed of a stranded wire made up of multiple thin wires. Rotor.

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