Motor rotor and die

Abstract

A motor rotor comprises: an iron core; the permanent magnet assembly comprises a plurality of circumferential magnetizing permanent magnets and a plurality of radial magnetizing permanent magnets, the circumferential magnetizing permanent magnets generate a magnetic field approximately in the circumferential direction, the radial magnetizing permanent magnets generate a magnetic field approximately in the radial direction, and the radial magnetizing permanent magnets and the circumferential magnetizing permanent magnets are alternately arranged on the radial periphery of the iron core; wherein a plurality of grooves are formed in the radial periphery of the iron core, the grooves are recessed inwards in the radial direction, and the circumferential magnetizing permanent magnets are partially assembled in the corresponding grooves; and the groove is internally provided with an elastic supporting piece, and the elastic supporting piece is configured to support the radial inner wall of the circumferential magnetizing permanent magnet.

Description

Technical Field

[0001] This utility model relates to a motor rotor and a mold, and more specifically, to a motor rotor and a corresponding mold that are easier to assemble. Background Technology

[0002] During the assembly of the motor rotor, the permanent magnet assembly is first arranged on the radial outer periphery of the iron core and placed into a mold. Then, injection molding material is injected into the injection hole to fix the rotor assembly and the iron core together. However, tolerances may exist during the processing of the permanent magnets, resulting in uneven lengths of the permanent magnets. This means that permanent magnets that are too long cannot be placed into the mold, while permanent magnets that are too short will form large gaps and reduce the performance of the electrode rotor.

[0003] Therefore, it is desirable to propose a motor rotor that improves upon the shortcomings of the aforementioned prior art. Utility Model Content

[0004] According to a first aspect of this utility model, a motor rotor is provided, comprising: an iron core; and a permanent magnet assembly including a plurality of circumferentially magnetized permanent magnets and a plurality of radially magnetized permanent magnets. The circumferentially magnetized permanent magnets generate a magnetic field in a generally circumferential direction, and the radially magnetized permanent magnets generate a magnetic field in a generally radial direction. The plurality of radially magnetized permanent magnets and the plurality of circumferentially magnetized permanent magnets are alternately arranged on the radial outer periphery of the iron core. The radial outer periphery of the iron core is provided with a plurality of grooves, which are recessed inward along the radial direction. The circumferentially magnetized permanent magnets are partially assembled in the corresponding grooves. Furthermore, an elastic support member is provided within the groove, and the elastic support member is configured to support the radial inner wall of the circumferentially magnetized permanent magnet.

[0005] According to this scheme, grooves are provided on the iron core to facilitate the positioning of the permanent magnet during the assembly of the motor rotor. Furthermore, by providing elastic supports within the grooves, the elastic supports remain against the permanent magnet during assembly, thus avoiding assembly difficulties or performance degradation caused by uneven magnet length.

[0006] In some designs, adjacent circumferentially magnetized permanent magnets can come into contact with radially magnetized permanent magnets.

[0007] In some designs, the motor rotor may also include an injection-molded body that is filled inside the motor rotor to secure the permanent magnet assembly and the iron core together.

[0008] In some designs, an injection hole can be formed on the radially inner side of the elastic support, and a portion of the injection-molded body fills the injection hole.

[0009] In some designs, the resilient support may include two supports arranged symmetrically about the groove, with a gap between them.

[0010] In some designs, the injection body in the injection hole can contact the radial inner wall of the circumferentially magnetized permanent magnet through a notch.

[0011] According to this scheme, after the injection-molded body fills the injection hole, it can closely contact the radial inner wall of the circumferentially magnetized permanent magnet, thereby increasing the radial positioning strength and connection strength of the permanent magnet.

[0012] In some embodiments, the support may include a support end and a support root, the support end being located circumferentially inside the groove relative to the support root, a notch being formed between the two support ends, the support end being configured to support the radial inner wall of the circumferentially magnetized permanent magnet during the assembly of the motor rotor, and the support root being connected to the circumferential sidewall of the groove.

[0013] According to the scheme, during the assembly of the permanent magnet, the support end of the elastic support is always in contact with the permanent magnet, thereby avoiding assembly difficulties or performance degradation caused by uneven length of the permanent magnet.

[0014] In some designs, the iron core may have multiple protrusions located on both sides of the corresponding groove, and the two protrusions between adjacent grooves form an assembly space for the radially magnetized permanent magnet.

[0015] In some designs, the outer diameter of the circumferentially magnetized permanent magnet can be smaller than that of the radially magnetized permanent magnet.

[0016] In some designs, a positioning groove can be formed on the radial outer side of the circumferentially magnetized permanent magnet.

[0017] In some designs, the radial length of the positioning groove can be between 0.45 mm and 0.55 mm.

[0018] In some designs, the outer circumferential length of the circumferentially magnetized permanent magnet can be between 5.5 mm and 10.5 mm.

[0019] In some designs, the circumferential length of the notch can be greater than the length of the support root.

[0020] In some designs, the radial width at the support end can be smaller than the radial width at the support root.

[0021] According to a second aspect of the present invention, a mold is provided for manufacturing an electric motor rotor according to a first aspect of the present invention. The mold has a receiving space for accommodating the electric motor rotor. The mold is provided with a plurality of bosses that protrude inward in the radial direction, and circumferentially magnetized permanent magnets are located between the corresponding bosses and grooves.

[0022] According to the scheme, the groove of the iron core corresponds to the boss of the mold, which increases the positioning strength of the permanent magnet, shortens the manufacturing time of the motor rotor, reduces the error rate when assembling the permanent magnet, and improves production efficiency.

[0023] In some designs, the boss can mate with a positioning slot.

[0024] According to the scheme, the boss of the mold corresponds to the positioning groove on the outer surface of the permanent magnet, which facilitates the circumferential and radial positioning of the permanent magnet during assembly, thereby improving assembly efficiency. Attached Figure Description

[0025] Figure 1 A schematic diagram of a motor rotor according to an embodiment of the present invention is shown;

[0026] Figure 2 yes Figure 1 A magnified view of a portion of the view;

[0027] Figure 3 A perspective view of an iron core according to an embodiment of the present invention is shown;

[0028] Figure 4 A plan view of an iron core according to an embodiment of the present invention is shown;

[0029] Figure 5 yes Figure 4 A magnified view of a portion of the view;

[0030] Figure 6 A schematic diagram of an assembled motor rotor according to an embodiment of the present invention is shown;

[0031] Figure 7 yes Figure 6 A magnified view of a portion of the image.

[0032] Figure label:

[0033] 100 motor rotor

[0034] 110 iron core

[0035] 112 Groove

[0036] 114 Protrusions

[0037] 122 circumferentially magnetized permanent magnet

[0038] 123 Positioning slot

[0039] 124 radially magnetized permanent magnets

[0040] 130 Elastic Support

[0041] 131 Support

[0042] 132 injection hole

[0043] 134 Support end

[0044] 135 Supporting Body

[0045] 136 Supporting Roots

[0046] 137 Gap

[0047] 140 injection molded body

[0048] 200 molds

[0049] 202 convex platform

[0050] x Width of injection hole

[0051] y Length of injection hole

[0052] a. Length of the gap

[0053] b. Length of the supporting body

[0054] e Length of the supporting root Detailed Implementation

[0055] To make the objectives, solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Unless otherwise stated, the terms used herein have their ordinary meanings in the art. The same reference numerals in the drawings represent the same parts.

[0056] For clarity, unless otherwise explicitly stated, the directional terms used in this document are defined as follows: the radial direction refers to the direction passing through and perpendicular to the central axis of the motor rotor; the circumferential direction refers to the direction perpendicular to both the central axis and the radial direction (the tangential direction along the circumference).

[0057] Figure 1A schematic diagram of a motor rotor 100 according to an embodiment of the present invention is shown. The motor rotor 100 mainly includes an iron core 110 and a permanent magnet assembly, which is arranged on the radial outer periphery of the iron core 110. The permanent magnet assembly includes a circumferentially magnetized permanent magnet 122 and a radially magnetized permanent magnet 124. The circumferentially magnetized permanent magnet 122 generates a magnetic field generally along the circumferential direction, and the radially magnetized permanent magnet 124 generates a magnetic field generally along the radial direction. The circumferentially magnetized permanent magnet 122 and the radially magnetized permanent magnet 124 are alternately arranged on the radial outer periphery of the iron core 110. Optionally, the circumferentially magnetized permanent magnet 122 and the radially magnetized permanent magnet 124 are in contact with each other. Preferably, the outer diameter of the circumferentially magnetized permanent magnet 122 can be smaller than the outer diameter of the radially magnetized permanent magnet 124, so that a positioning groove 123 can be formed on the radial outer side of the circumferentially magnetized permanent magnet 122. The positioning groove 123 facilitates the assembly of the permanent magnet. Optionally, the radial length of the positioning groove 123 can be between 0.45 mm and 0.55 mm, and preferably, the radial length of the positioning groove 123 can be 0.5 mm. Optionally, the outer circumferential length of the circumferentially magnetized permanent magnet 122 can be between 5.5 mm and 10.5 mm. It should be understood that, although Figure 1 The diagram shows ten pairs of circumferentially magnetized permanent magnets 122 and radially magnetized permanent magnets 124, but the present invention is not limited thereto. The motor assembly 100 may include any number of circumferentially magnetized permanent magnets 122 and radially magnetized permanent magnets 124.

[0058] Figure 3 and Figure 4 The diagrams show a perspective view and a plan view of the iron core 110. The iron core 110 has multiple grooves 112 on its radially outer periphery. These grooves 112 are recessed radially inward, and each groove 112 corresponds to a corresponding circumferentially magnetized permanent magnet 122. The circumferentially magnetized permanent magnet 122 is partially assembled in the corresponding groove 112. Specifically, the radially inner side of the circumferentially magnetized permanent magnet 122 is assembled in the corresponding groove 112. Furthermore, the iron core 110 may also have multiple protrusions 114 located on both sides of the corresponding groove 112. Two protrusions 114 between adjacent grooves 112 form an assembly space for the radially magnetized permanent magnet 124.

[0059] An elastic support 130 is provided within the groove 112, and the elastic support 130 is configured to support the circumferentially magnetized permanent magnet 122 during the assembly of the permanent magnet. For example... Figure 5As shown, an injection hole 132 can be formed on the radially inner side of the elastic support 130, and the elastic support 130 includes two support bodies 131, which are symmetrically arranged about the groove 112, and a notch 137 is formed between the two support bodies 131. During the assembly of the motor assembly 100, injection molding material 140 (e.g., bulk molding material BMC) is injected into the injection hole 132. The molten injection molding material 140 fills the injection hole 132 and flows to the outside of the iron core 110 through the notch 137, so that the injection body 140 fills the gap that may exist between the permanent magnet and the iron core 110 (i.e., the injection body 140 contacts the radially inner wall of the circumferentially magnetized permanent magnet 122), thereby fixing the permanent magnet and the iron core 110 together and increasing the radial positioning strength and connection strength of the permanent magnet.

[0060] like Figure 5 As shown, the support 131 includes a support end 134, a support body 135, and a support root 136. The support end 134 is close to the center of the groove 112, and the support root 136 is close to the circumferential sidewall of the groove (e.g., Figure 5 (As shown in the upper and lower walls), the support body 135 is located between the support end 134 and the support root 136. During the assembly of the motor rotor 100, the support end 134 supports the radial inner wall of the circumferentially magnetized permanent magnet 122, such that during the assembly of the permanent magnet, the support end 134 of the elastic support 130 always abuts against the permanent magnet (e.g., the upper and lower walls). Figure 2 As shown in the diagram, this avoids assembly difficulties or performance degradation caused by uneven permanent magnet length. Specifically, if the length of the circumferentially magnetized permanent magnet 122 is too large, the support end 134 of the elastic support member 130 is compressed inward, providing sufficient space to accommodate the circumferentially magnetized permanent magnet 122, thus making its assembly easier. Conversely, if the length of the circumferentially magnetized permanent magnet 122 is too small, the support end 134 of the elastic support member 130 can extend outward, resulting in a smaller or even no gap between the circumferentially magnetized permanent magnet 122 and the iron core 110, thereby improving the performance of the motor rotor 100. The support root 136 connects to the circumferential sidewall of the groove 112, thereby fixing it to the iron core 110.

[0061] Optionally, such as Figure 5As shown, the length y of the injection hole 132 can be 8.6 mm, and the width x can be 2.5 mm. The length a of the notch 137 can be 1 mm, the length b of the support body 135 can be 3.8 mm, and the length e of the support root 136 can be 0.5 mm. The length b of the support body 135 is the distance from the edge of the notch 137 to the position flush with the edge of the injection hole 132, and the length e of the support root 136 is the distance from the position flush with the edge of the injection hole 132 to the edge of the groove 112. It should be understood that the above dimensions are merely exemplary, and this utility model is not intended to limit the specific dimensions of the components and structures.

[0062] Figure 6 A schematic diagram of assembling a motor rotor 100 according to an embodiment of the present invention is shown. First, the iron core 110 and permanent magnet assembly (multiple circumferentially magnetized permanent magnets 122 and multiple radially magnetized permanent magnets 124) are placed in a mold 200. Then, molten injection molding material 140 is filled into injection holes (e.g., injection hole 132). After the molten injection molding material 140 cools and solidifies, it forms an injection molded body 140, which fixes the permanent magnets to the iron core 110. In the prior art, because the outer diameter of the circumferentially magnetized permanent magnets is smaller than that of the radially magnetized permanent magnets, the permanent magnets need to be manually arranged before assembly and then placed into the mold sequentially, which increases production time significantly.

[0063] Therefore, such as Figure 7 As shown, the mold 200 proposed in this utility model has multiple bosses 202, which protrude inward in the radial direction. Each boss 202 corresponds to a corresponding circumferentially magnetized permanent magnet 122 and a corresponding groove 112, with the circumferentially magnetized permanent magnet 122 located between the corresponding boss 202 and groove 112. This increases the positioning strength of the permanent magnet and reduces the error rate during assembly, thereby improving production efficiency. More specifically, the bosses 202 of the mold 200 can cooperate with the positioning grooves 123 of the motor rotor 100, facilitating circumferential and radial positioning of the permanent magnet during the assembly of the motor rotor 100, eliminating the need for manual arrangement of the permanent magnet before assembly, thus improving assembly efficiency.

[0064] This document describes in detail several exemplary embodiments of the present invention with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the concept of the present invention, and various technical features and structures proposed in the present invention can be combined without exceeding the protection scope of the present invention, which is determined by the appended claims.

Claims

1. A motor rotor, characterized in that, include: Iron core; A permanent magnet assembly includes a plurality of circumferentially magnetized permanent magnets and a plurality of radially magnetized permanent magnets, wherein the circumferentially magnetized permanent magnets generate a magnetic field in a generally circumferential direction and the radially magnetized permanent magnets generate a magnetic field in a generally radial direction, and the plurality of radially magnetized permanent magnets and the plurality of circumferentially magnetized permanent magnets are alternately arranged on the radial outer periphery of the iron core. The iron core has multiple grooves on its radial outer periphery, and the grooves are recessed inward along the radial direction. The circumferentially magnetized permanent magnet is partially assembled in the corresponding groove. Furthermore, the groove is provided with an elastic support member, which is configured to support the radial inner wall of the circumferentially magnetized permanent magnet.

2. The motor rotor according to claim 1, characterized in that, Adjacent circumferentially magnetized permanent magnets and radially magnetized permanent magnets are in contact with each other.

3. The motor rotor according to claim 2, characterized in that, It also includes an injection-molded body that fills the motor rotor to secure the permanent magnet assembly and the iron core together.

4. The motor rotor according to claim 3, characterized in that, An injection hole is formed on the radially inner side of the elastic support, and a portion of the injection-molded body fills the injection hole.

5. The motor rotor according to claim 4, characterized in that, The elastic support includes two support bodies, which are symmetrically arranged about the groove, and a gap is formed between the two support bodies.

6. The motor rotor according to claim 5, characterized in that, The injection-molded body in the injection hole contacts the radial inner wall of the circumferentially magnetized permanent magnet through the notch.

7. The motor rotor according to claim 5, characterized in that, The support includes a support end and a support root, the support end being located circumferentially inside the groove relative to the support root, the notch being formed between the two support ends, the support end being configured to support the radial inner wall of the circumferentially magnetized permanent magnet during assembly of the motor rotor, and the support root being connected to the circumferential sidewall of the groove.

8. The motor rotor according to claim 1, characterized in that, The iron core is provided with multiple protrusions, which are located on both sides of the corresponding grooves. The two protrusions between adjacent grooves form the assembly space of the radially magnetized permanent magnet.

9. The motor rotor according to claim 1, characterized in that, The outer diameter of the circumferentially magnetized permanent magnet is smaller than the outer diameter of the radially magnetized permanent magnet.

10. The motor rotor according to claim 1, characterized in that, A positioning groove is formed on the radial outer side of the circumferentially magnetized permanent magnet.

11. The motor rotor according to claim 10, characterized in that, The length of the positioning groove along the radial direction is between 0.45 mm and 0.55 mm.

12. The motor rotor according to claim 1, characterized in that, The outer circumferential length of the circumferentially magnetized permanent magnet is between 5.5 mm and 10.5 mm.

13. The motor rotor according to claim 7, characterized in that, The circumferential length of the notch is greater than the length of the support root.

14. The motor rotor according to claim 7, characterized in that, The radial width of the support end is smaller than the radial width of the support root.

15. A mold for manufacturing an electric motor rotor according to any one of claims 1 to 14, characterized in that, The mold has a receiving space to accommodate the motor rotor; The mold is provided with multiple bosses that protrude inward along the radial direction, and the circumferentially magnetized permanent magnet is located between the corresponding bosses and grooves.

16. The mold according to claim 15, characterized in that, The boss engages with the positioning groove.

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