Rotor core

Abstract

The rotor core provided by the utility model can inhibit the deformation of the rotor core when the bridge component provided separately from the rotor core is assembled to the rotor core and the generation of residual stress in the rotor core. The rotor core is provided with a magnet insertion hole, the magnet insertion hole has a plurality of magnet insertion portions, and the bridge component formed by a non-magnetic body is inserted into the inside. The rotor core is provided with a bridge insertion portion, the bridge insertion portion is arranged at a position where the magnet insertion hole is respectively divided into a plurality of regions including the magnet insertion portion, and the bridge component is inserted. The rotor core is provided with a resin portion at a portion of the magnet insertion hole other than the magnet insertion portion and the bridge insertion portion.

Description

Technical Field

[0001] This utility model relates to a rotor core. Background Technology

[0002] Conventionally, rotor cores with bridge components arranged in a manner that divides the holes for permanent magnets are known (for example, see Patent Document 1). In Patent Document 1, the bridge components are formed of a non-magnetic material and are installed in a fitting hole that is part of the holes for permanent magnets by press-fitting and thermoforming. The bridge components are, for example, inserted into a rotor core in a heated and expanded state. In Patent Document 1, by having such bridges, the mechanical strength of the rotor core is improved.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2009-201269

[0004] However, in Patent Document 1, the bridge component is inserted into the rotor core in a heated and expanded state, and therefore its shape and size are set to correspond to the shape and size of the fitting hole. If a press-fit or thermoforming method is used to insert such a bridge component into the fitting hole, there is a possibility of rotor core deformation or residual stress in the rotor core. As a result, the strength of the rotor core may decrease. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a rotor core that can suppress the deformation of the rotor core and the generation of residual stress in the rotor core when the bridge component, which is separately set from the rotor core, is assembled on the rotor core.

[0006] The above objective is achieved by a rotor core having a magnet insertion hole with multiple magnet insertion portions for inserting a bridge component formed of a non-magnetic material. The rotor core has bridge insertion portions positioned to divide the magnet insertion hole into multiple regions including the magnet insertion portions for inserting the bridge component. A resin portion is provided in the portion of the magnet insertion hole other than the magnet insertion portions and the bridge insertion portions.

[0007] A rotor core capable of suppressing rotor core deformation and the generation of residual stress in the rotor core when the bridge component, which is separately configured from the rotor core, is assembled with the rotor core. Attached Figure Description

[0008] Figure 1 This is an explanatory diagram of a rotor having a rotor core with an implementation method.

[0009] Figure 2 This is an enlarged view of a magnetic pole formed on the rotor in the embodiment.

[0010] Figure 3 It is Figure 2The X partial solution is used to schematically illustrate an enlarged view of the state. Detailed Implementation

[0011] (Implementation Method)

[0012] Figure 1 The rotor 1 shown includes a rotor core 10, a first permanent magnet 21 embedded in the rotor core 10, and a second permanent magnet 22. The rotor 1, together with a stator (not shown) consisting of three phases (U, V, and W), forms a rotary motor. The rotary motor formed by the rotor 1 is a permanent magnet synchronous rotary motor, also known as an IPM (Interior Permanent Magnet) motor. A rotating shaft (not shown) is fixed at the center of the rotor 1. In this embodiment, the rotor 1 forms an 8-pole, 24-slot motor. However, the form of the motor is not limited to this, and various conventionally known forms can be used.

[0013] The rotor 1 has an even number of evenly spaced components arranged circumferentially, separated by the q-axis. Figure 1 The rotor core 10 has eight magnetic poles 2. The polarities of the even-numbered magnetic poles 2 alternate and reverse circumferentially. Each magnetic pole 2 has a magnet insertion hole 11. (Refer to...) Figure 2 Each magnetic pole 2 has a circumferentially symmetrical structure with respect to the d-axis. Furthermore, the circumferential center of the magnet insertion hole 11 coincides with the d-axis. The magnet insertion hole 11 has a circumferentially symmetrical shape with respect to the d-axis.

[0014] The magnet insertion hole 11 has a first region 11a on one side of the circumferential direction relative to the d-axis. The magnet insertion hole 11 has a bridge insertion portion 11b in the area through which the d-axis passes, and a second region 11c on the other side of the circumferential direction relative to the d-axis. A resin portion 30 is provided in the magnet insertion hole 11. The resin portion 30 will be described in detail later.

[0015] The first region 11a has a first magnet insertion portion 11a1. A first permanent magnet 21 is inserted into the first magnet insertion portion 11a1. The first region 11a has a first air hole 11a2 on the side closer to the bridge insertion portion 11b than the first magnet insertion portion 11a1, that is, on the side closer to the d-axis. The first air hole 11a2 is filled with resin material. The first region 11a has a second air hole 11a3 on the side farther from the bridge insertion portion 11b than the first magnet insertion portion 11a1, that is, on the side closer to the q-axis. The second air hole 11a3 is filled with resin material. The resin material filling the first air hole 11a2 and the second air hole 11a3 is, for example, a thermoplastic resin, and conventionally known resin materials can be used. The first air hole 11a2 and the second air hole 11a3 form part of the resin portion 30. In addition, for ease of understanding, the resin portion 30 is shaded in the figures.

[0016] The bridge insertion portion 11b is formed in the region through which the d-axis passes. The bridge insertion portion 11b is configured such that its length direction aligns with the radial direction of the rotor core 10. The bridge insertion portion 11b is inserted... Figure 3 The bridge component 25 is shown. The bridge component 25 connects the inner and outer peripheral sides of the magnet insertion hole 11 in the rotor core 10.

[0017] The bridge component 25 is formed of a non-magnetic material. The bridge component 25 has a main body portion 25a extending radially when assembled with the rotor core 10. The bridge component 25 has a first tapered portion 25b at one end and a second tapered portion 25c at the other end. The dimensions of the first tapered portion 25b and the second tapered portion 25c are smaller on the side closest to the main body portion 25a and increase in size as they move outwards. The bridge insertion portion 11b has a shape corresponding to the shape of the first tapered portion 25b and the second tapered portion 25c. That is, the magnet insertion hole 11 has engaging portions 11b1 on both the radially outer and radially inner sides of the rotor core 10. The first tapered portion 25b and the second tapered portion 25c are respectively disposed within the engaging portions 11b1. Similar to the first air hole 11a2 and the second air hole 11a3, resin material is filled around the bridge component 25. The resin material forms a resin portion 30. Thus, centrifugal force, i.e., the radial force of the rotor core 10, acts on the bridge component 25. In addition, the bridge component 25 may also have other shapes to replace the first cone 25b and the second cone 25c.

[0018] The second region 11c has a second magnet insertion portion 11c1. A second permanent magnet 22 is inserted into the second magnet insertion portion 11c1. The second region 11c has a third air hole 11c2 on the side closer to the bridge insertion portion 11b than the second magnet insertion portion 11c1, that is, on the side closer to the d-axis. The third air hole 11c2 is filled with resin material. The second region 11c has a fourth air hole 11c3 on the side of the second magnet insertion portion 11c1 away from the bridge insertion portion 11b, that is, on the side closer to the q-axis. The fourth air hole 11c3 is filled with resin material. Similar to the first air hole 11a2 and the second air hole 11a3, the third air hole 11c2 and the fourth air hole 11c3 form part of the resin portion 30.

[0019] A resin portion 30 is disposed within the magnet insertion hole 11. The resin portion 30 is disposed within the magnet insertion hole 11, excluding the first magnet insertion portion 11a1, the second magnet insertion portion 11c1, and the bridge insertion portion 11b. Thus, in the rotor 1, the portion excluding the first permanent magnet 21, the second permanent magnet 22, and the bridge component 25 constitutes the resin portion 30. The resin portion 30 also extends between the inner peripheral wall surface 111 of the magnet insertion hole 11 and the first permanent magnet 21. Furthermore, the resin portion 30 extends between the inner peripheral wall surface 111 of the magnet insertion hole 11 and the second permanent magnet 22. Additionally, it extends between the inner peripheral wall surface 111 of the magnet insertion hole 11 and the bridge component 25. Therefore, the first permanent magnet 21, the second permanent magnet 22, and the bridge component 25 are fixed within the magnet insertion hole 11 by the resin portion 30. The resin portion 30 forms an insulating layer.

[0020] The bridge component 25 increases the strength of the rotor 1. As a result, the rotor 1 can rotate at a higher speed. The bridge component 25 is formed of a non-magnetic material. Therefore, short circuits in the magnetic flux can be suppressed. Consequently, the rotor 1 can rotate efficiently, and its rotational speed can be increased or its size can be reduced.

[0021] In the rotor 1 of this embodiment, the bridge component 25 is fixed and assembled to the rotor core 10 by curing the resin material. If a hot-press fitting or press-fitting method is used to assemble the bridge component 25 to the rotor core 10, there is a possibility of deformation of the rotor core 10 and residual stress in the rotor core 10. In contrast, with resin materials, compared to hot-press fitting, construction can be carried out in a very low temperature range, avoiding processing accompanied by overheating and component deformation. Therefore, deformation of the rotor core 10 or residual stress in the rotor core 10 can be avoided. This improves the strength of the rotor 1. Furthermore, the resin portion 30 also improves the strength of the rotor 1. By improving the strength of the rotor 1, the rotational speed of the rotor 1 can be increased.

[0022] Fixing with resin materials is also more cost-effective than hot pressing or pressing.

[0023] [Effect]

[0024] In this embodiment, the rotor core 10 has a resin portion 30 within the magnet insertion hole 11, excluding the magnet insertion portions 11a and 11c and the bridge insertion portion 11b. The resin portion 30 secures the bridge component 25 disposed within the magnet insertion hole 11. The resin portion 30 can secure the bridge component 25 without requiring processing that could lead to overheating or component deformation. Therefore, deformation and residual stress during the assembly of the bridge component 25 to the rotor core 10 can be suppressed.

[0025] The embodiments of the present utility model have been described in detail above, but the present utility model is not limited to the specific embodiments described above. Various modifications and alterations can be made within the scope of the spirit of the present utility model as described in the scope of protection claimed in this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1…Rotor; 2…Magnetic pole; 10…Rotor core; 11…Magnet insertion hole; 11a…First region; 11a1…First magnet insertion part; 11a2…First air hole; 11a3…Second air hole; 11b…Bridge insertion part; 11c…Second region; 11c1…Second magnet insertion part; 11c2…Third air hole; 11c3…Fourth air hole; 21…First permanent magnet; 22…Second permanent magnet; 25…Bridge component; 25a…Main body part; 25a…First cone part; 25b…Second cone part; 30…Resin part; 111…Inner peripheral wall surface.

Claims

1. A rotor core having a magnet insertion hole having a plurality of magnet insertion portions for inserting a bridge component formed of a non-magnetic material into the interior, wherein, The rotor core includes a bridge insertion portion, which is positioned to divide the magnet insertion hole into multiple regions, allowing the bridge component to be inserted. A resin portion is provided in the part of the magnet insertion hole other than the magnet insertion part and the bridge insertion part.

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