Stator core and axial flux motor

Abstract

The utility model discloses a stator iron core and an axial flux motor, the stator iron core comprises a plurality of iron core blocks, the plurality of iron core blocks are annularly arranged at intervals, each iron core block comprises a tooth part and shoe parts arranged at two axial sides of the tooth part, and the tooth part is provided with a cavity. According to the technical scheme, the cavities are formed in the tooth parts of the iron core blocks, magnetic flux can be distributed in the axial magnetic flux motor more uniformly, the nonuniformity of the magnetic flux is reduced, the output power and efficiency of the axial magnetic flux motor can be improved, materials are saved, the weight is reduced, the lightweight design is achieved, and the cost is reduced. And the power density of the axial magnetic flux motor can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a stator core and an axial flux electric machine. BACKGROUND

[0002] Electric machines can be divided into radial flux electric machines and axial flux electric machines, and the axial flux electric machines are widely concerned due to their compact structure, large torque density and short axial length, and are particularly suitable for occasions where the axial size is limited. However, there are still many problems in the axial flux electric machines that need to be improved, such as the overall weight and efficiency. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to at least solve one of the technical problems in the related art. To this end, the present application provides a stator core.

[0004] To achieve the above-mentioned purpose, the present application discloses a stator core, which comprises a plurality of core blocks, the plurality of core blocks are arranged in an annular manner, each core block comprises a tooth portion and a shoe portion arranged on both axial sides of the tooth portion, and the tooth portion is provided with a cavity.

[0005] In some embodiments of the present application, the surface of the tooth portion is provided with an opening, and the opening and the cavity are in communication.

[0006] In some embodiments of the present application, the opening is arranged on the side of the tooth portion away from the center of the stator core.

[0007] In some embodiments of the present application, the cavity is gradually expanded in the direction away from the center of the stator core.

[0008] In some embodiments of the present application, the part of the tooth portion located on one side in the circumferential direction of the cavity and the part of the tooth portion located on the other side in the circumferential direction of the cavity are arranged in equal thickness and / or symmetry.

[0009] In some embodiments of the present application, the depth of the cavity is greater than half of the radial dimension of the tooth portion.

[0010] In some embodiments of the present application, the cavity wall on one side in the circumferential direction of the cavity and the cavity wall on the other side in the circumferential direction of the cavity form an acute angle.

[0011] In some embodiments of the present application, along the radial direction of the stator core, the width of the end of the tooth portion away from the center of the stator core is w1, the width of the opening is w2, and the width of the end of the tooth portion facing the center of the stator core is w3, and w1-w2>2*w3 is satisfied.

[0012] In some embodiments of the present application, the core block is molded from a soft magnetic composite material.

[0013] A second aspect of the present application discloses an axial flux motor, comprising a rotor and the above-mentioned stator core, the rotor being located in the axial direction of the stator core.

[0014] The present application can make the magnetic flux more evenly distributed in the axial flux motor by setting the cavity in the tooth part of the core block, reduce the unevenness of the magnetic flux, and is conducive to improving the output power and efficiency of the motor. In addition, the design of the cavity saves materials and reduces weight, realizes lightweight design, and is conducive to improving the power density of the axial flux motor.

[0015] Other advantages of the present application will be given in part in the following description, part will become apparent from the following description, or will be understood by practicing the present application. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings shown.

[0017] Figure 1 The axial flux motor (double rotor single stator form) in some embodiments of the present application is shown in the figure.

[0018] Figure 2 The axial flux motor is shown in the figure. Figure 1 The axial flux motor is shown in the figure.

[0019] Figure 3 The stator core in some embodiments is shown in the figure.

[0020] Figure 4 The core block of the stator core in some embodiments is shown in the figure.

[0021] Figure 5 The core block of the stator core in some embodiments is shown in the figure.

[0022] Figure 6 The axial flux motor is shown in the figure. Figure 5 Another perspective view is shown in the figure.

[0023] Explanation of reference signs:

[0024] Stator core 100, core block 1000, tooth portion 1100, circumferential one side portion 1110, circumferential other side portion 1120, cavity 1130, opening 1140, shoe portion 1200, rotor 200, axial flux motor 300.

[0025] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0027] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, motion condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directionality indications also change accordingly.

[0028] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal connection of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0029] In addition, the description such as "first", "second", etc. in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed by the present application.

[0030] The first aspect of the present application discloses a stator core 100, which is combined with Figure 1 , Figure 2 , Figure 3 , Figure 4 andFigure 5 As shown, the stator core 100 includes a plurality of core blocks 1000, the plurality of core blocks 1000 are arranged in a ring shape, the core block 1000 includes a tooth portion 1100 and a shoe portion 1200, the axial two sides of the tooth portion 1100 are respectively provided with the shoe portion 1200, and the tooth portion 1100 is provided with a cavity 1130.

[0031] By providing the cavity 1130 in the tooth portion 1100 of the core block 1000, the magnetic flux can be more uniformly distributed in the interior of the axial flux motor 300, the unevenness of the magnetic flux is reduced, which is beneficial to improve the output power and efficiency of the axial flux motor 300. The design of the cavity 1130 saves materials, reduces weight, realizes lightweight design, and is beneficial to improve the power density of the axial flux motor 300.

[0032] Specifically, the axial flux motor 300 is further described below for the stator core 100. The axial flux motor 300 includes a stator and a rotor 200, and the rotor 200 is located in the axial direction of the stator. It can be understood that the axial flux motor 300 has various types, which can be in the form of double-rotor single-stator (the axial two sides of the stator are respectively provided with the rotor 200), or in the form of single-rotor double-stator (one side of the axial direction of the rotor 200 is provided with the stator, and the other side of the axial direction is also provided with the stator), or in the form of single-rotor single-stator (the rotor 200 and the stator are coaxially arranged), and of course, there is also a form of multiple-rotor multiple-stator.

[0033] The stator includes a stator core 100 and an enameled wire (not shown in the figure) wound on the stator core 100, wherein the stator core 100 includes a plurality of core blocks 1000, the plurality of core blocks 1000 are two or more, and the stator core 100 shown in the figure includes 18 core blocks 1000, and each core block 1000 needs to be wound with a corresponding enameled wire. The core block 1000 includes a tooth portion 1100 and a shoe portion 1200, the axial two sides of the tooth portion 1100 are respectively provided with the shoe portion 1200 (here, the axial direction is the axial direction of the axial flux motor 300, and the radial direction is perpendicular to the axial direction), the shoe portion 1200 is larger than the tooth portion 1100, and the enameled wire is wound on the tooth portion 1100 and is blocked by the shoe portion 1200 on the axial two sides. In this embodiment, the tooth portion 1100 is provided with a cavity 1130, and the cavity 1130 can make the magnetic flux more uniformly distributed in the interior of the axial flux motor 300, reduce the unevenness of the magnetic flux, and be beneficial to improve the output power and efficiency of the motor. And the design of the cavity 1130 can save materials, reduce costs, and at the same time reduce the weight of the stator core 100, which is beneficial to realize the lightweight design of the axial flux motor 300 and improve the power density of the axial flux motor 300.

[0034] In combination with Figure 4 and Figure 5As shown, in some embodiments, the surface of the tooth portion 1100 is provided with an opening 1140, which is in communication with the cavity 1130, so as to facilitate the machining of the cavity 1130 on the tooth portion 1100. For example, the cavity 1130 is formed by machining drilling, and the cavity 1130 is machined on the tooth portion 1100 by drilling from the outside to the inside with a drill bit, so that the opening 1140 is formed on the surface of the tooth portion 1100. For another example, the core block 1000 is formed by molding, and the cavity 1130 and the opening 1140 are formed after demolding. It is worth noting that the arrangement of the cavity 1130 and the opening 1140 increases the heat dissipation area of the tooth portion 1100, thereby facilitating the heat dissipation of the core block 1000, i.e., the heat dissipation of the stator core 100, so as to improve the distribution and transmission of heat, thereby improving the thermal stability of the axial flux motor 300, especially for the axial flux motor 300 of the double-rotor single-stator type, since the stator is located in the middle and is difficult to dissipate heat, the arrangement of the cavity 1130 and the opening 1140 on the tooth portion 1100 of the stator core 100 facilitates heat dissipation.

[0035] The opening 1140 can be arranged at multiple positions, for example, along the circumferential direction of the stator core 100, the opening 1140 is arranged on the side surface of the tooth portion 1100, although in this case the heat dissipation performance can be improved compared with the scheme without the opening 1140, but since multiple core blocks 1000 are arranged in an annular alternating manner, when the opening 1140 is arranged on the side surface of the tooth portion 1100 in the circumferential direction, the opening 1140 of any one core block 1000 corresponds to the opening of the adjacent core block 1000, and the heat dissipation will be affected by the adjacent core block 1000. In order to further improve the heat dissipation performance, in combination with Figure 3 、 Figure 4 and Figure 5 As shown, in some embodiments, the opening 1140 is arranged on the side of the tooth portion 1100 away from the center of the stator core 100. Taking the axial flux motor 300 of the double-rotor single-stator type as an example, when the opening 1140 is arranged on the side of the tooth portion 1100 away from the center of the stator core 100, the opening 1140 is open in the radial direction, the path of heat transfer between the opening 1140 and the outside is shortened, and the opening 1140 can even be directly communicated with the outside, so as to be more conducive to the heat dissipation of the stator core 100.

[0036] In combination with Figure 3 、 Figure 4 and Figure 5As shown, the cavity 1130 is arranged in a diverging manner along the direction away from the center of the stator core 100. Generally, when the plurality of core blocks 1000 are arranged in a ring shape, each core block 1000 has a sector shape as a whole, and the tooth portion 1100 and the shoe portion 1200 also have a sector shape, that is, the tooth portion 1100 is arranged in a diverging manner along the direction away from the center of the stator core 100. Based on this, the cavity 1130 is arranged in a diverging manner along the direction away from the center of the stator core 100, and under the premise that the core block 1000 has a sector shape, this can reduce the magnetic flux non-uniformity of the one end of the tooth portion 1100 close to the center of the stator core 100 and the one end of the tooth portion 1100 away from the center of the stator core 100, and further make the magnetic flux more uniformly distributed in the inner part of the axial flux motor 300.

[0037] In addition, due to the sector shape of the core block 1000, the one end of the tooth portion 1100 away from the center of the stator core 100 is relatively larger than the one end of the tooth portion 1100 close to the center of the stator core 100, which is more conducive to opening a larger opening 1140, and the larger opening 1140 is more conducive to achieving heat dissipation in the cavity 1130, and further improves the heat dissipation performance.

[0038] In combination with Figure 4 , Figure 5 and Figure 6 shown, in some embodiments, the part 1110 of the tooth portion 1100 located on one circumferential side of the cavity 1130 and the part 1120 of the tooth portion 1100 located on the other circumferential side of the cavity 1130 are arranged in equal thickness and / or symmetry, that is, the part 1110 of the tooth portion 1100 located on one circumferential side of the cavity 1130 and the part 1120 of the tooth portion 1100 located on the other circumferential side of the cavity 1130 can be arranged in equal thickness, can be arranged in symmetry, or can be arranged in both equal thickness and symmetry. By such arrangement, it is conducive to reducing the magnetic resistance of the magnetic circuit, making the magnetic circuit more smooth, and is also conducive to the uniform distribution of the magnetic flux in the circumferential direction of the stator core 100, and thus further makes the magnetic flux of the axial flux motor 300 uniformly distributed. It is worth noting that by arranging the part 1110 of the tooth portion 1100 located on one circumferential side of the cavity 1130 and the part 1120 of the tooth portion 1100 located on the other circumferential side of the cavity 1130 in equal thickness and / or symmetry, the existence of structural weak points can be avoided as much as possible.

[0039] Due to the ring-shaped arrangement of the plurality of core blocks 1000, by arranging the part 1110 of the tooth portion 1100 of each core block 1000 located on one circumferential side of the cavity 1130 and the part 1120 of the tooth portion 1100 located on the other circumferential side of the cavity 1130 in equal thickness and / or symmetry, the stability of the axial flux motor 300 during operation can be enhanced, and the noise during operation can be reduced.

[0040] In combination withFigure 6 As shown, in some embodiments, the depth of the cavity 1130 is greater than half of the radial dimension of the tooth portion 1100. Since the opening 1140 is arranged on the side of the tooth portion 1100 away from the center of the stator core 100, by designing the depth L1 of the cavity 1130 to be greater than the radial dimension L of the tooth portion 1100, it is more conducive to increase the heat dissipation area of the tooth portion 1100, especially conducive to dissipating the heat inside the core block 1000. And since the core block 1000 has a fan-shaped shape and the cavity 1130 is arranged in a gradually expanding manner away from the center of the stator core 100, by making the depth of the cavity 1130 greater than half of the radial dimension of the tooth portion 1100, it is further conducive to uniform distribution of magnetic flux, further reduces the unevenness of the magnetic flux, and further saves materials, reduces weight, and is more conducive to lightweight design.

[0041] In combination Figure 6 As shown, the cavity wall on one side of the cavity 1130 and the cavity wall on the other side of the cavity 1130 intersect to form an acute angle. The circumferential direction is the circumferential direction of the stator core 100, that is, along the circumferential direction of the stator core 100, the included angle α between the cavity wall on one side of the cavity 1130 and the cavity wall on the other side is an acute angle. By so arranging, the depth of the cavity 1130 can be designed to be greater than half of the radial dimension of the tooth portion 1100, and the acute angle arrangement also facilitates demolding of the core block 1000 during mold pressing.

[0042] In combination Figure 6 As shown, in some embodiments, along the radial direction of the stator core 100, the width of the end of the tooth portion 1100 away from the center of the stator core 100 is w1, the width of the opening 1140 is w2, and the width of the end of the tooth portion 1100 facing the center of the stator core 100 is w3, satisfying w1-w2>2*w3. By so arranging, the magnetic saturation of the tooth portion 1100 is effectively avoided, and the uniformity of the magnetic flux at the end of the tooth portion 1100 close to the center of the stator core 100 and the end of the tooth portion 1100 away from the center of the stator core 100 is further optimized, so that the magnetic flux is more evenly distributed in the inner part of the axial flux motor 300, and the motor efficiency is more improved.

[0043] In some embodiments, the core block 1000 is mold pressed from a soft magnetic composite material. The soft magnetic composite material is a composite material with soft magnetic function composed of soft magnetic ferrite and a polymer matrix. Mold pressing can complete relatively complex structure shape processing, especially when the core block 1000 contains the cavity 1130, which is more conducive to processing of the core block 1000.

[0044] The application also discloses an axial flux motor 300, in combination Figure 1 , Figure 2 ,Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown in FIG. 12, the axial flux motor 300 includes the rotor 200 and the stator core 100 described above, the stator core 100 includes a plurality of core blocks 1000, the plurality of core blocks 1000 are arranged in an annular manner, the core block 1000 includes a tooth portion 1100 and a shoe portion 1200, the tooth portion 1100 is provided with the shoe portion 1200 on both axial sides, and the tooth portion 1100 is provided with a cavity 1130, and the rotor 200 is located in the axial direction of the stator core 100. The axial flux motor 300 can be in the form of a double-rotor single-stator (the axial flux motor 300 in the figure is in the form of a double-rotor single-stator), can also be in the form of a single-rotor double-stator, and can also be in the form of a single-rotor single-stator.

[0045] By providing the cavity 1130 on the tooth portion 1100 of the core block 1000, the magnetic flux can be more uniformly distributed in the interior of the axial flux motor 300, the unevenness of the magnetic flux is reduced, the output power and efficiency of the axial flux motor 300 are improved, the cavity 1130 is designed to save materials and reduce weight, and the lightweight design is achieved, which is beneficial to improve the power density of the axial flux motor 300. It can be understood that the stator core 100 of the axial flux motor 300 of the embodiment adopts the technical solutions of the above-mentioned embodiments, and therefore at least has the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0046] The above only describes the preferred embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation, direct / indirect application in other related technical fields based on the concept of the present application and the content of the specification and drawings are included in the patent protection scope of the present application.

Claims

1. A stator core (100), characterized by, The iron core block (1000) comprises a tooth portion (1100) and a shoe portion (1200) arranged on both axial sides of the tooth portion (1100), and the tooth portion (1100) is provided with a cavity (1130).

2. The stator core (100) of claim 1, characterized in that The tooth portion (1100) is provided with an opening (1140) on the surface, and the opening (1140) and the cavity (1130) are in communication.

3. The stator core (100) of claim 2, characterized in that The opening (1140) is arranged on the side of the tooth portion (1100) away from the center of the stator core (100).

4. The stator core (100) of claim 3, characterized in that The cavity (1130) is arranged in a gradually expanding manner away from the center of the stator core (100).

5. The stator core (100) of claim 4, characterized in that The tooth portion (1100) is arranged in an equal thickness and / or symmetrical manner on the circumferential side of the cavity (1130) and on the circumferential side of the cavity (1130).

6. The stator core (100) of claim 3, characterized in that The depth of the cavity (1130) is greater than half of the radial dimension of the tooth portion (1100).

7. The stator core (100) as claimed in claim 3, characterized in that The cavity wall on the circumferential side of the cavity (1130) and the cavity wall on the circumferential side of the cavity (1130) intersect to form an acute angle.

8. The stator core (100) as claimed in claim 3, characterized in that Along the radial direction of the stator core (100), the width of the end of the tooth portion (1100) away from the center of the stator core (100) is w1, the width of the opening (1140) is w2, and the width of the end of the tooth portion (1100) facing the center of the stator core (100) is w3, and w1-w2>2*w3 is satisfied.

9. The stator core (100) as claimed in claim 1, characterized in that The iron core block (1000) is molded by a soft magnetic composite material.

10. An axial flux electric machine (300) characterized by, The rotor (200) is arranged on the axial side of the stator core (100).

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