A magnetic yoke fixing structure for an axial magnet motor

Abstract

This utility model relates to the field of motor technology and discloses a magnetic yoke fixing structure for an axial magnet motor, comprising: an annular groove on the top surface of the magnetic yoke back plate, multiple upward-through limiting grooves on the circumference of the annular groove, and horizontally positioned limiting lugs in each of the multiple limiting grooves; each limiting lug and the bottom of the limiting groove are provided with corresponding first positioning holes; the magnetic yoke is annular and bonded to the annular groove, with multiple magnetic yoke lugs on the circumference of the magnetic yoke, each magnetic yoke lug extending below the limiting lug in the limiting groove, and a second positioning hole corresponding to the first positioning hole on the magnetic yoke lug; positioning pins are inserted into the two first positioning holes and the second positioning hole; multiple magnets are bonded to the top of the magnetic yoke in a circular shape; this fixing structure eliminates the use of screws; reduces the thickness of the magnetic yoke back plate, thereby reducing the overall thickness of the motor; maintains the structural integrity of the magnetic yoke back plate and increases its strength; and maintains the integrity of the magnetic circuit in the magnetic yoke, making the magnetic circuit more uniform.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a magnetic yoke fixing structure for an axial magnet motor. Background Technology

[0002] In existing technologies, the magnetic yoke of axial magnet motors is usually fixed by adhesive bonding, screw fixing, or a combination of both.

[0003] However, the glue fixing method has the risk of weak adhesion and yoke falling off; the screw fixing method requires drilling threaded holes in the yoke back plate. Drilling holes in the yoke will affect the magnetic circuit direction in the yoke, making the magnetic circuit uneven. At the same time, it will reduce the structural strength of the back plate. In addition, since the thread depth affects the thickness of the back plate, it will increase the total thickness of the axial magnet motor. Utility Model Content

[0004] This utility model proposes an axial magnet motor yoke fixing structure to solve the shortcomings of the prior art. The fixing structure eliminates the use of screws; reduces the thickness of the yoke back plate, thereby reducing the total thickness of the motor; maintains the structural integrity of the yoke back plate and increases its strength; and maintains the integrity of the magnetic circuit in the yoke, making the magnetic circuit more uniform.

[0005] The technical solution of this utility model is: an axial magnet motor yoke fixing structure, comprising:

[0006] The magnetic yoke back plate has an annular groove on its top surface. The annular groove has multiple upward-through limiting grooves in its circumference. Each of the multiple limiting grooves has a horizontally arranged limiting lug. Each limiting lug and the bottom of the limiting groove has a corresponding first positioning hole.

[0007] The magnetic yoke is ring-shaped and bonded to an annular groove. The yoke has multiple magnetic yoke lugs on its circumference, and each of the magnetic yoke lugs corresponds to a specific limiting groove. Each magnetic yoke lug extends into the limiting groove below the limiting lug. The magnetic yoke lugs have second positioning holes corresponding to the first positioning holes. Positioning pins are inserted into the two first positioning holes and the second positioning holes. The top of the magnetic yoke is circular and has multiple magnets bonded to it.

[0008] In at least one embodiment of this utility model, the limiting ear is located in the middle of the inner wall of the limiting groove, and the distance between one side of the limiting ear and the side wall of the limiting groove is greater than the width of the magnetic yoke ear. When the limiting ear abuts against the side wall of the limiting groove, the first positioning hole and the second positioning hole correspond to each other. The limitation of the side width of the limiting ear can ensure that when the magnetic yoke is installed into the annular groove from top to bottom, the magnetic yoke ear can be smoothly embedded into the limiting groove from the side of the limiting ear.

[0009] In at least one embodiment of this utility model, the gap between the first positioning hole on each of the limiting ear pieces and the positioning pin is filled with adhesive; the adhesive further serves to fix the yoke and prevent the positioning pin from falling off, thereby ensuring the yoke is securely fixed.

[0010] In at least one embodiment of the present invention, the circumferential direction of the magnetic yoke abuts against the inner wall of the annular groove.

[0011] In at least one embodiment of the present invention, the bottom of the plurality of limiting grooves is flush with the bottom of the annular groove.

[0012] In at least one embodiment of the present invention, a plurality of the limiting grooves are evenly arranged on the inner wall of the annular groove, the magnetic yoke back plate is integrally formed with the plurality of limiting ear pieces, and the plurality of magnetic yoke ear pieces are integrally formed with the magnetic yoke.

[0013] In at least one embodiment of the present invention, the two sides of the plurality of magnets respectively abut against the two inner walls of the annular groove.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention proposes a magnetic yoke fixing structure for an axial magnet motor. By employing a combination of adhesive bonding, locking lugs and yoke lugs, and locating pin connections, the yoke is securely fixed. Unlike existing screw-based fixing methods, this structure eliminates depth requirements for the second locating hole on the yoke, allowing for positioning by aligning the first and second locating holes. This maximizes the structural integrity and strength of the yoke backplate, eliminating the need for extensive material reduction machining and preserving the integrity and uniformity of the magnetic circuit. Furthermore, the yoke and magnet thicknesses are designed without compatibility issues with screw heads, reducing the yoke backplate thickness and consequently the overall motor thickness. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall assembly structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the magnetic yoke backplate structure of this utility model;

[0019] Figure 4 This is a partially enlarged structural diagram of the magnetic yoke backplate of this utility model;

[0020] Figure 5 This is a schematic diagram of the magnetic yoke structure of this utility model;

[0021] Figure 6 This is a partially enlarged schematic diagram of the magnetic yoke structure of this utility model;

[0022] Figure 7 This is a schematic diagram of the magnet structure of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Magnetic yoke back plate; 11. Annular groove; 12. Limiting groove; 121. Limiting lug; 121. First positioning hole; 2. Magnetic yoke; 21. Magnetic yoke lug; 211. Second limiting hole; 3. Positioning pin; 4. Magnet. Detailed Implementation

[0025] The accompanying drawings in this invention are not strictly drawn to scale, and the specific dimensions and quantity of each structure can be determined according to actual needs. The drawings described in this invention are merely structural schematic diagrams.

[0026] To make the objectives, technical solutions, and advantages of the embodiments 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. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the described embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "inner," "outer," "upper," "lower," "far," "near," "front," and "rear" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] When using screw connections for existing magnetic yokes, two issues need to be considered.

[0029] First, the height of the screw head. The screw head height cannot be compatible with the relationship between the yoke thickness, the magnet thickness, and the air gap. The screw head may protrude into the air gap, which will increase the thickness of the motor yoke in the motor structure design. The yoke thickness and the magnet thickness must be able to meet or include the screw head height.

[0030] Secondly, there are requirements regarding the depth of the threaded holes that mate with the screws. Generally, the magnetic yoke is mounted on the rotor backplate, and the rotor backplate material is generally divided into two types: aluminum and iron. The aluminum material is generally aluminum alloy, with 6061 and 7075 being the most commonly used. When using screws to connect these materials, the depth of the threaded holes is generally designed to be twice the nominal diameter of the thread. This means that the thickness of the backplate needs to be matched to the screws used when designing it. Therefore, the thickness of the magnetic yoke backplate (and the aforementioned rotor backplate or backplate) is limited during the design process. Generally, the smallest screw that can be used is M3. Taking an M3 screw as an example, the thread length of the threaded hole will reach 6 mm, and the drilling depth needs to be increased by the top depth of the bottom hole, which is about 2.5 mm. Without penetrating the backplate, the minimum thickness of the backplate at the threaded hole should be 8.5 mm. However, this thickness can be further reduced if the structure meets the strength requirements. In other words, if screws are not used, an 8.5 mm thick backplate is not required to meet the strength requirements.

[0031] The positioning hole in this invention has no thickness requirement; positioning is achieved simply by aligning the hole positions. This eliminates the need for screws, allowing for a reduction in backplate thickness while still meeting strength requirements.

[0032] At the through-holes where the screws are located on the back plate of the magnetic yoke, because the holes are drilled, there is no material in this area. However, since the magnetic circuit propagates within the metal part of the magnetic yoke, the magnetic circuit will be denser on both sides of the hole in order to connect, while it will be relatively uniform in other areas without holes. Overall, the magnetic circuit is uneven. On the other hand, a magnetic yoke without holes (or with only limit holes without depth requirements) will have a more uniform magnetic circuit compared to a magnetic yoke with threaded holes of greater depth.

[0033] Combination Figures 1 to 7 As shown, an axial magnet motor yoke fixing structure includes:

[0034] The magnetic yoke back plate 1 has an annular groove 11 on its top surface. The annular groove 11 has multiple upward-through limiting grooves 12 in its circumference. Each limiting groove 12 has a horizontally arranged limiting ear piece 121. Each limiting ear piece 121 and the bottom of the limiting groove 12 have a corresponding first positioning hole 122.

[0035] The magnetic yoke 2 is annular and is bonded to the annular groove 11. The magnetic yoke 2 has multiple magnetic yoke lugs 21 around its circumference. The multiple magnetic yoke lugs 21 correspond one-to-one with multiple limiting grooves 12. Each magnetic yoke lug 21 extends into the limiting groove 12 below the limiting lug 121. The magnetic yoke lug 21 has a second positioning hole 211 corresponding to the first positioning hole 122. Positioning pins 3 are inserted into the two first positioning holes 122 and the second positioning hole 211. Specifically, the top of the positioning pin 3 is lower than the upper surface of the limiting lug 121. The top of the magnetic yoke 2 is circular and has multiple magnets 4 bonded to it.

[0036] As an alternative embodiment, the limiting ear 121 is located in the middle of the inner wall of the limiting groove 12. The distance between one side of the limiting ear 121 and the side wall of the limiting groove 12 is greater than the width of the magnetic yoke ear 21. When the limiting ear 121 abuts against the side wall of the limiting groove 12, the first positioning hole 122 and the second positioning hole 211 correspond. The limitation of the side width of the limiting ear 121 can ensure that when the magnetic yoke 2 is installed into the annular groove 11 from top to bottom, the magnetic yoke ear 21 can be smoothly inserted into the limiting groove 12 from the side of the limiting ear 121. Then, the magnetic yoke 2 is rotated to make the first positioning hole 122 and the second positioning hole 211 correspond.

[0037] As an alternative embodiment, the gap between the first positioning hole 122 on each limiting ear piece 121 and the positioning pin 3 is filled with adhesive; the adhesive further serves to fix the yoke and prevent the positioning pin 3 from falling off, thereby ensuring the secure fixation of the magnetic yoke 2.

[0038] As an alternative embodiment, the circumferential direction of the magnetic yoke 2 abuts against the inner wall of the annular groove 11; this design enables precise and stable fixation within the annular groove 11, and ensures that the first positioning hole 122 and the second positioning hole 211 precisely correspond after the magnetic yoke 2 rotates.

[0039] As an alternative embodiment, the bottom of the plurality of limiting grooves 12 is flush with the bottom of the annular groove 11; the above limitation ensures that there is no transition between the limiting grooves 12 and the annular groove 11, so that the magnetic yoke 2 can also be a flat plate, which generally reduces the processing difficulty of the magnetic yoke back plate 1 and the magnetic yoke 2.

[0040] As an alternative embodiment, multiple limiting grooves 12 are evenly arranged on the inner wall of the annular groove 11, the magnetic yoke back plate 1 and multiple limiting lugs 121 are integrally formed, and multiple magnetic yoke lugs 21 are integrally formed with the magnetic yoke 2. While ensuring structural strength, the processing difficulty of the magnetic yoke back plate 1 and the magnetic yoke 2 is reduced.

[0041] As an alternative embodiment, the two sides of the plurality of magnets 4 respectively abut against the two inner walls of the annular groove 11; the above limitation enables the plurality of magnets 4 to be stably and accurately installed on the top of the magnetic yoke 2.

[0042] The assembly method of this embodiment:

[0043] Apply glue into the annular groove 11 in the magnetic yoke back plate 1;

[0044] Align the magnetic yoke lugs 21 of the magnetic yoke 2 with the limiting grooves 12 of the magnetic yoke back plate 1, place the magnetic yoke 2 into the magnetic yoke back plate 1, and rotate the magnetic yoke 2 until the sidewalls of the magnetic yoke lugs 21 of the magnetic yoke abut against the limiting grooves 12, thereby aligning the two first positioning holes 122 and the second positioning hole 211.

[0045] Insert the positioning pin 3 sequentially into the two first positioning holes 122 and the second positioning hole 211;

[0046] Fill the gap between the installed positioning pin 3 and the end of the first positioning hole 122 on 1042 with glue.

[0047] Magnets 4 are then attached to yoke 2 in sequence to complete the structural assembly.

[0048] The above embodiments are merely specific implementations of this utility model patent, used to illustrate the technical solution of this utility model patent, and not to limit it. The protection scope of this utility model patent is not limited thereto. Although this utility model patent has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features within the technical scope disclosed in this utility model; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions implemented by this utility model patent, and should all be covered within the protection scope of this utility model.

Claims

1. A magnetic yoke fixing structure for an axial magnet motor, characterized in that, include: The magnetic yoke back plate (1) has an annular groove (11) on its top surface. The annular groove (11) has multiple upward-through limiting grooves (12) in its circumference. Each of the multiple limiting grooves (12) has a horizontally arranged limiting ear (121). Each limiting ear (121) and the bottom of each limiting groove (12) has a corresponding first positioning hole (122). The magnetic yoke (2) is annular and is bonded to the annular groove (11). The magnetic yoke (2) has multiple magnetic yoke lugs (21) circumferentially. The multiple magnetic yoke lugs (21) correspond one-to-one with the multiple limiting grooves (12). Each magnetic yoke lug (21) extends into the limiting groove (12) below the limiting lug (121). The magnetic yoke lug (21) has a second positioning hole (211) corresponding to the first positioning hole (122). Positioning pins (3) are inserted into the two first positioning holes (122) and the second positioning hole (211). The top of the magnetic yoke (2) is circular and has multiple magnets (4) bonded to it.

2. The magnetic yoke fixing structure of an axial magnet motor according to claim 1, wherein The limiting ear (121) is located in the middle of the inner wall of the limiting groove (12). The distance between one side of the limiting ear (121) and the side wall of the limiting groove (12) is greater than the width of the magnetic yoke ear (21). When the limiting ear (121) abuts against the side wall of the limiting groove (12), the first positioning hole (122) and the second positioning hole (211) correspond to each other.

3. The magnetic yoke fixing structure of an axial magnet motor according to claim 1, wherein The gap between the first positioning hole (122) on each of the limiting ear pieces (121) and the positioning pin (3) is filled with adhesive.

4. The axial magnet motor yoke fixing structure of claim 1, wherein The circumferential direction of the magnetic yoke (2) abuts against the inner wall of the annular groove (11).

5. The axial magnet motor yoke fixing structure of claim 1, wherein The bottom of the plurality of limiting grooves (12) is flush with the bottom of the annular groove (11).

6. The axial magnet motor yoke fixing structure as described in claim 1, characterized in that, Multiple limiting grooves (12) are evenly arranged on the inner wall of the annular groove (11). The magnetic yoke back plate (1) and multiple limiting ear pieces (121) are integrally formed, and multiple magnetic yoke ear pieces (21) and magnetic yoke (2) are integrally formed.

7. The axial magnet motor yoke fixing structure of claim 1, wherein The two sides of the plurality of magnets (4) respectively abut against the two inner walls of the annular groove (11).

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