A rotor

Abstract

Wire members are appropriately arranged on an outer peripheral surface of a rotor core. The present application provides a rotor having: a rotor core composed of a magnetic material; and an outer peripheral reinforcing wire member spirally wound on an outer peripheral surface of the rotor core. The outer peripheral reinforcing wire member is composed of a stranded wire in which a plurality of thin wires are twisted. According to the structure of the rotor, a structure in which a plurality of thin wires are stacked on the outer peripheral surface of the rotor core can be obtained. Therefore, the rotor can be appropriately reinforced. In addition, since the thin wires are twisted into the stranded wire, the thin wires can be prevented from being collapsed.

Description

Technical Field

[0001] The technology disclosed herein relates to a rotor. Background Technology

[0002] The rotor disclosed in Japanese Patent Application Publication No. 2016-082773 has wire wound around the outer periphery of the rotor core to strengthen the rotor core. However, when multiple layers of wire are wound around the outer periphery of the rotor core, coil collapse may occur. Utility Model Content

[0003] This disclosure proposes a technique for appropriately arranging wires on the outer circumferential surface of a rotor core to effectively strengthen the rotor core through the outer circumferential reinforcing wires.

[0004] The rotor disclosed herein comprises: a rotor core made of magnetic material; and an outer peripheral reinforcing wire wound in a spiral shape around the outer peripheral surface of the rotor core. The outer peripheral reinforcing wire is composed of a stranded wire made of multiple fine wires twisted together.

[0005] In this rotor, an outer reinforcing wire, consisting of strands of multiple fine wires twisted together, is wound around the outer circumference of the rotor core, thus achieving a structure with multiple layers of fine wires stacked on the outer circumference of the rotor core. Furthermore, because the fine wires are twisted together, it prevents the individual wires from unraveling due to collapse or other reasons. Therefore, the rotor core can be effectively strengthened using the outer reinforcing wire. Attached Figure Description

[0006] Figure 1 This is a side view of the rotor in an embodiment.

[0007] Figure 2A This is a partial cross-sectional schematic diagram illustrating one embodiment of the peripheral reinforcing wire.

[0008] Figure 2B This is a partial cross-sectional schematic diagram of another illustrative embodiment of the peripheral reinforcing wire.

[0009] Figure 3 This is a partial cross-sectional view of the rotor. Detailed Implementation

[0010] Figure 1 The rotor 10 of the illustrated embodiment is used inside the stator of the motor. The rotor 10 rotates about the rotation axis AX. The rotor 10 has a shaft 20, a rotor core 30, and outer peripheral reinforcing wires 70.

[0011] Shaft 20 has a cylindrical shape that is concentric with the rotating shaft AX and functions as the output shaft of the motor.

[0012] The rotor core 30 is made of a magnetic material with high permeability (e.g., soft magnetic material, hard magnetic material, etc.). For example, the rotor core 30 may be composed of multiple electromagnetic steel plates stacked axially. The rotor core 30 has a cylindrical shape. The rotor core 30 is fixed to the shaft 20 concentrically with the rotation shaft 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 shaft AX.

[0013] The outer peripheral reinforcing wire 70 is spirally wound around the outer peripheral surface of the rotor core 30. The outer peripheral reinforcing wire 70 is wound around the rotor core 30 to apply pressure to the rotor core 30. The outer peripheral reinforcing wire 70 is wound around the outer peripheral surface of the rotor core 30 over a relatively large area from near one end face to near the other end face.

[0014] exist Figure 2A In one illustrative embodiment shown, the outer reinforcing wire 70 is composed of a stranded wire formed by twisting together multiple fine wires 72. Each fine wire 72 is made of a magnetic material.

[0015] exist Figure 2B In another illustrative embodiment shown, the outer reinforcing wire 70 can be a stranded wire with a quadrilateral cross-section, which is press-formed. According to this structure, the occupancy rate of the fine wires 72 on the outer peripheral surface of the rotor core 30 can be further increased, and the strength and magnetic properties of the rotor core 30 can be improved more effectively.

[0016] like Figure 3 As shown, the outer reinforcing wire 70 is wound in a manner that forms a single layer on the outer peripheral surface of the rotor core 30. Therefore, multiple layers of fine wires 72 are overlapped on the outer peripheral surface of the rotor core 30.

[0017] When the rotor 10 rotates, centrifugal force is applied to the rotor core 30. The outer reinforcing wire 70 is wound around the outer circumferential surface of the rotor core 30, thereby suppressing deformation of the rotor core 30. Specifically, multiple layers of fine wires 72 are overlapped on the outer circumferential surface of the rotor core 30, thus strongly reinforcing the rotor core 30. Therefore, deformation of the rotor core 30 caused by centrifugal force can be appropriately suppressed. Furthermore, the outer reinforcing wire 70 is made of a magnetic material, thus achieving high magnetic properties in the rotor 10.

[0018] Furthermore, as a technique for overlapping multiple layers of fine wires 72 on the outer peripheral surface of the rotor core 30, there is a technique for winding single, thin wires 72 in multiple layers on the outer peripheral surface of the rotor core 30. However, in this technique, the fine wires 72 may enter between the lower layers of the fine wires 72, or between the electromagnetic steel plates constituting the rotor core 30, resulting in problems such as the fine wires 72 collapsing or irregular distribution. In contrast, in the rotor 10 of the present disclosure embodiment, a stranded wire formed by twisting multiple fine wires 72 is wound as an outer peripheral reinforcing wire 70 on the outer peripheral surface of the rotor core 30, thus the fine wires 72 are combined together, preventing them from unraveling. Therefore, the collapse of the fine wires 72 can be prevented. Therefore, on the outer peripheral surface of the rotor core 30, the fine wires 72 are wound regularly and closely arranged. Therefore, the rotor 10 can be effectively strengthened, and the magnetic characteristics of the rotor 10 can be effectively improved. Furthermore, due to the regular distribution of the fine wires 72, the dimensional accuracy of the outer diameter of the rotor 10 is improved, which allows for a narrower gap between the rotor 10 and the stator, thus improving motor performance. Additionally, the rotor 10 can be manufactured by winding only one layer of the outer reinforcing wire 70, thereby reducing the manufacturing cost of the rotor 10.

[0019] Furthermore, in the above embodiment, only one layer of outer peripheral reinforcing wire 70 is wound on the outer peripheral surface of the rotor core 30, but two or more layers of outer peripheral reinforcing wire 70 may also be wound on the outer peripheral surface of the rotor core 30. In this case, collapse can be suppressed compared to the case of winding a single thin wire 72 with the same thickness.

[0020] Although the embodiments have been described in detail above, they are merely illustrative and do not limit the scope of the claims. The technology described in the claims includes technologies obtained by various modifications and alterations to the specific examples illustrated above. The technical elements described in this specification or drawings exert their technical usefulness individually or in various combinations, and are not limited to the combinations recited in the claims at the time of application. In addition, the technology illustrated in this specification or drawings achieves multiple objectives simultaneously, and achieving one of these objectives is itself technically useful.

[0021] Explanation of reference numerals in the attached figures 10: Rotor 20: Axis 30: Rotor core 70: Peripheral reinforced wire 72: Thin line

Claims

1. A rotor characterized by, have: The rotor core is made of magnetic material; and The outer reinforcing wire is spirally wound around the outer circumferential surface of the rotor core. The outer reinforcing wire is composed of a stranded wire made of multiple thin wires twisted together.

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