Motor assembly

Abstract

The invention provides a motor assembly. The motor assembly comprises a rotor iron core, a stator iron core, an end plate assembly and a plurality of windings, the stator iron core is arranged on the periphery of the rotor iron core in a sleeving mode, and a plurality of first tooth parts extending in the radial direction of the stator iron core are arranged on the inner circumferential face of the stator iron core at intervals in the circumferential direction of the stator iron core; the end plate assemblies are arranged at the two ends of the stator core in the axial direction, the end plate assemblies are provided with a plurality of second tooth parts at intervals in the circumferential direction, the second tooth parts extend in the radial direction, the number of the second tooth parts is the same as that of the first tooth parts, and the second tooth parts and the first tooth parts are arranged in a one-to-one correspondence mode; the number of the windings is the same as that of the first tooth parts, and each winding is wound outside the second tooth parts and the first tooth parts; wherein the end plate assembly is made of a soft magnetic composite material. The motor assembly provided by the invention can improve the power density of the motor.

Description

Technical Field

[0001] This application relates to the field of motor technology, and in particular to a motor assembly. Background Technology

[0002] Permanent magnet synchronous motors have advantages such as high efficiency, high power density, and high power factor, and have been widely used. However, the existing motor stators have wire frames at the ends to support the motor windings. The wire frames occupy a certain amount of space at the ends of the motor stator, resulting in considerable waste at the ends of the motor stator, which in turn prevents further improvement in the power density of the motor. Summary of the Invention

[0003] This application provides a motor assembly to improve the power density of the motor assembly.

[0004] To address the aforementioned technical problems, this application provides a motor assembly comprising a rotor core, a stator core, an end plate assembly, and multiple windings. The stator core is sleeved on the outer periphery of the rotor core, wherein the inner circumferential surface of the stator core is provided with multiple first teeth extending radially at intervals along its circumference; the end plate assembly is disposed at both ends of the stator core in its axial direction, wherein the end plate assembly is provided with multiple second teeth extending radially at intervals along its circumference, the same number as the first teeth, and the second teeth are arranged in a one-to-one correspondence with the first teeth; the number of windings is the same as the number of first teeth, and each winding is wound around the second teeth and the first teeth; wherein the end plate assembly is made of a soft magnetic composite material.

[0005] In one embodiment, the motor assembly further includes a plurality of magnets spaced circumferentially around the outer periphery of the rotor core, wherein a first dimension of the rotor core and the magnets added together in the axial direction is greater than a second dimension of the stator core and the end plate assembly added together in the axial direction.

[0006] In one embodiment, the motor assembly further includes a snap-fit ​​component that snaps axially onto the end of the first tooth and abuts against the end of the second tooth.

[0007] In one embodiment, the snap-fit ​​assembly is made of an insulating soft magnetic composite material.

[0008] In one embodiment, the third dimension of the snap-fit ​​assembly in the axial direction is smaller than the first dimension and larger than the second dimension, and the two ends of the snap-fit ​​assembly in the axial direction protrude from the two ends of the stator end plate assembly and the stator core.

[0009] In one embodiment, the circumferential dimension of the snap-fit ​​assembly is larger than the circumferential dimensions of the first tooth and the second tooth.

[0010] In one embodiment, the snap-fit ​​assembly includes two snap-fit ​​members, each having a groove. One snap-fit ​​member is located at one axial end of the first tooth, and the other snap-fit ​​member is located at the other axial end of the first tooth.

[0011] In one embodiment, a protrusion is formed at the end of the first tooth in a radial direction, and the circumferential dimension of the protrusion is smaller than the circumferential dimension of the first tooth, wherein the protrusion is disposed in a groove.

[0012] In one embodiment, the end plate assembly includes a plurality of first end plates and a plurality of second end plates. The plurality of first end plates are disposed at the first end of the stator core in the axial direction, wherein each first end plate includes N second teeth spaced apart in the circumferential direction; the plurality of second end plates are disposed at the second end of the stator core in the axial direction, wherein each second end plate includes M second teeth spaced apart in the circumferential direction, wherein M>=N and N>=1.

[0013] In one embodiment, a plurality of first end plates are integrally formed; or a plurality of second end plates are integrally formed.

[0014] In one embodiment, the stator core is an integral stator core; and / or the rotor core is an integral rotor core.

[0015] In one embodiment, the stator core is a composite soft magnetic material stator core; and / or the rotor core is a composite soft magnetic material rotor core.

[0016] The beneficial effects of this application are as follows: the motor assembly includes a rotor core, a stator core, an end plate assembly, and multiple windings. The stator core is sleeved on the outer periphery of the rotor core. The inner circumferential surface of the stator core is provided with multiple first teeth that extend radially at intervals along its circumference. The end plate assembly is located at both ends of the stator core in its axial direction. The end plate assembly is provided with multiple second teeth that extend radially at intervals along its circumference and have the same number as the first teeth. The second teeth correspond one-to-one with the first teeth. The number of windings is the same as the number of first teeth. Each winding is wound around the second teeth and the first teeth. The end plate assembly is made of soft magnetic composite material. The endplate assembly of this application is made of composite soft magnetic material. Therefore, the SMC endplate assembly of this application has insulation properties, which can reduce the eddy current loss of the motor assembly when the motor assembly is in a high-frequency operating mode. In addition, the SMC endplate assembly also has high magnetic permeability. As part of the magnetic link of the motor assembly, the SMC endplate assembly participates in the electromagnetic energy conversion, which enables the motor assembly to increase the power density without increasing the effective electromagnetic space. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of the structure of an embodiment of the motor assembly provided in this application; Figure 2 yes Figure 1 An exploded view of part of the motor assembly in the embodiment; Figure 3 yes Figure 1 The schematic diagram of the winding structure is not shown in the embodiments; Figure 4 yes Figure 1 A cross-sectional view of one embodiment of the motor assembly; Figure 5 This is a schematic diagram of the structure of an embodiment of the stator core provided in this application; Figure 6 This is a structural schematic diagram of an embodiment of the first end plate / second end plate provided in this application; Figure 7 This is a schematic diagram of an embodiment of the card connector provided in this application.

[0018] Reference numerals: 10 Motor assembly; 110 Rotor core; 120 Stator core; 121 First tooth; 122 First yoke; 123 Protrusion; 130 End plate assembly; 131 First end plate; 132 Second end plate; 133 Second tooth; 1311 Second yoke; 140 Winding; 150 Magnet; 160 Snap-fit ​​assembly; 161 Snap-fit ​​piece; 1611 Positioning part; 1612 Groove. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that if the embodiments of this application involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this application involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0022] This application provides a motor assembly 10, see reference. Figures 1 to 7 The motor assembly 10 includes a rotor core 110, a stator core 120, an end plate assembly 130, and a plurality of windings 140. The stator core 120 is sleeved on the outer periphery of the rotor core 110 and is coaxially arranged. The stator core 120 includes a first yoke 122 and a first tooth 121. Specifically, the inner circumferential surface of the stator core 120 is provided with a plurality of first teeth 121 extending radially at intervals along its circumference. Adjacent first teeth 121 are connected by the first yoke 122, and a receiving groove for accommodating windings 140 is formed between adjacent first teeth 121. The end plate assembly 130 is provided at both ends of the stator core 120 in its axial direction. The end plate assembly 130 is provided with a plurality of second teeth 133 extending radially at intervals along its circumference, and the number of second teeth 133 is the same as the number of first teeth 121. The second teeth 133 are arranged one-to-one with the first teeth 121. The number of windings 140 is the same as the number of first teeth 121. Each winding 140 is wound around the second teeth 133 and the first teeth 121. The end plate assembly 130 is made of soft magnetic composite material.

[0023] The stator core 120 can be a laminated stator core 120 or a one-piece stator core 120, which is not limited here. Similarly, there is a rotor core 110, which can be a laminated rotor core 110 or a one-piece rotor core 110, which is not limited here.

[0024] The endplate assembly 130 is an endplate assembly made of soft magnetic composite (SMC), and is referred to as SMC endplate assembly 130 for short. The SMC is composed of high-purity iron powder or alloy powder, such as iron-phosphorus alloy, iron-silicon alloy, etc. The surface of these magnetic particles is coated with a thin layer of insulating material (such as phosphate, resin, etc.) to form an insulating layer, giving the particles good electrical insulation. Specifically, the SMC endplate assembly 130 can be pure iron SMC, iron-phosphorus alloy SMC, iron-silicon alloy SMC, iron-cobalt alloy SMC, iron-nickel alloy SMC, etc., and is not limited thereto.

[0025] The end plate assembly 130 of the motor assembly 10 in this application is made of composite soft magnetic material. Therefore, the SMC end plate assembly 130 of this application has insulation properties, which can reduce the eddy current loss of the motor assembly 10 when the motor assembly 10 is in a high-frequency operating mode. In addition, the SMC end plate assembly 130 also has high magnetic permeability. As part of the magnetic link of the motor assembly 10, the SMC end plate assembly 130 participates in electromagnetic energy conversion, which enables the motor assembly 10 to increase the power density without increasing the effective electromagnetic space.

[0026] In one embodiment, the end plate assembly 130 includes a plurality of first end plates 131 and a plurality of second end plates 132. The plurality of first end plates 131 are disposed at a first end of the stator core 120 in the axial direction; the plurality of second end plates 132 are disposed at a second end of the stator core 120 in the axial direction. Each first end plate 131 includes N second teeth 133 spaced apart circumferentially; each second end plate 132 includes M second teeth 133 spaced apart circumferentially, wherein M>=N, N>=1.

[0027] Each first end plate 131 includes N second teeth 133 spaced apart circumferentially. This means that each of the multiple first end plates 131 provided in this application has N second teeth 133 spaced apart circumferentially, and adjacent second teeth 133 are connected by a second yoke 1311. The number N of the second teeth 133 on the first end plate 131 is divisible by the number of first teeth 121 on the stator core 120. The number is at least one, but can also be three, four, six, etc., and is not limited here. For example, when the number of first teeth 121 is 24, N can be 2, 3, 4, 6, 8, 12, etc. The multiple first end plates 131 form a core ring with the same structure as the stator core 120.

[0028] Each second end plate 132 includes M second teeth 133 spaced apart circumferentially. This means that each of the multiple second end plates 132 provided in this application has M second teeth 133 spaced apart circumferentially, and adjacent second teeth 133 are connected by a second yoke 1311. The number M of the second teeth 133 on the second end plate 132 is divisible by the number of first teeth 121 in the stator core 120, and the number is at least one, but can also be two, three, four, six, etc., without limitation. For example, when the number of first teeth 121 is 24, M can be 1, 2, 3, 4, 6, 8, 12, etc. The multiple second end plates 132 form a core ring with the same structure as the stator core 120.

[0029] In this configuration, the first tooth 121 is provided with corresponding second teeth 133 at both ends in the axial direction. When the number of second teeth 133 on the first end plate 131 is the same as the number of second teeth 133 on the second end plate 132, the number of multiple first end plates 131 and multiple second end plates 132 is the same. When the number of second teeth 133 on the first end plate 131 is different from the number of second teeth 133 on the second end plate 132, the number of multiple first end plates 131 and multiple second end plates 132 is different. Since the number of second teeth 133 on the second end plate 132 is greater than the number of second teeth 133 on the first end plate 131, the number of first end plates 131 is greater than the number of second end plates 132, thereby ensuring that the number of second teeth 133 on multiple first end plates 131 is the same as the number of second teeth 133 on multiple second end plates 132.

[0030] The end plate assembly 130 of this embodiment is provided with a plurality of first end plates 131 and a plurality of second end plates 132. The first end plates 131 and the second end plates 132 may include one or more second teeth 133. When the number of second teeth 133 on the first end plates 131 and the second end plates 132 is the same, the structures of the first end plates 131 and the second end plates 132 are the same, and only one end plate mold needs to be developed, which can reduce the mold development cost and thus reduce the cost of the motor assembly 10. When the second teeth 133 on the first end plates 131 and the second end plates 132 have two or more second teeth 133, compared with an end plate with only one second tooth 133, the assembly steps can be reduced and the assembly speed of the motor assembly 10 can be increased.

[0031] In one embodiment, to reduce costs and increase the assembly speed of the motor assembly 10, multiple first end plates 131 are integrally formed. Understandably, during the assembly of the motor assembly 10, the integrally formed first end plates 131 do not need to be individually connected to the stator core 120; only the annular first end plates 131 need to be installed. This greatly reduces assembly steps, increases the assembly speed of the motor assembly 10, thereby increasing production speed and reducing costs.

[0032] In one embodiment, to further reduce costs and increase the assembly speed of the motor assembly 10, multiple second end plates 132 are integrally formed. Understandably, during the assembly of the motor assembly 10, the integrally formed second end plates 132 do not need to be individually connected to the stator core 120; only the annular second end plates 132 need to be installed. This greatly reduces assembly steps, increases the assembly speed of the motor assembly 10, thereby increasing production speed and reducing costs.

[0033] In one embodiment, a plurality of first end plates 131 are integrally formed, and a plurality of second end plates 132 are also integrally formed. In this case, the first end plates 131 and the second end plates 132 have the same structure, and can use the same mold, reducing costs and increasing the assembly rate of the motor assembly 10, thereby increasing production speed and further reducing costs.

[0034] In one embodiment, M=N, meaning that the number of second teeth 133 on the first end plate 131 and the second end plate 132 is the same. Since the number of second teeth 133 on the first end plate 131 and the second end plate 132 in this embodiment is the same, the structures of the first end plate 131 and the second end plate 132 in this embodiment are completely identical, requiring only one type of mold, thus reducing costs.

[0035] In one embodiment, the motor assembly 10 further includes a plurality of magnets 150, which are circumferentially spaced around the outer periphery of the rotor core 110. The first dimension L1 of the rotor core 110 and the magnets 150 added together in the axial direction is greater than the second dimension L2 of the stator core 120 and the end plate assembly 130 added together in the axial direction. Specifically, the first dimension L1 of the rotor core 110 and the magnets 150 refers to the axial dimension of the component formed by the rotor core 110 and the magnets 150. The second dimension L2 of the stator core 120 and the end plate assembly 130 added together in the axial direction is the axial dimension of the component formed by the stator core 120 and the end plate assembly 130. In the circumferential direction, adjacent magnets 150 have different magnetic polarities; for example, N-pole magnets 150 are adjacent to S-pole magnets 150 on both sides. The number of magnets 150 can be the same as the number of first teeth 121; or the number of magnets 150 can be different from the number of first teeth 121. For example, the number of magnets 150 is greater than the number of first teeth 121, or the number of magnets 150 is less than the number of first teeth 121. This is not limited here.

[0036] In this embodiment, the first axial dimension L1 of the rotor core 110 and magnet 150 is greater than the second axial dimension L2 of the stator core 120 and end plate assembly 130. Specifically, in the axial direction, the two ends of the rotor core 110 and magnet 150 protrude beyond the two ends of the stator core 120 and end plate assembly 130. The fact that the first axial dimension L1 of the rotor core 110 and magnet 150 is greater than the second axial dimension L2 of the stator core 120 and end plate assembly 130 allows the rotor core 110 and magnet 150 to concentrate magnets, further improving the power density of the motor assembly 10.

[0037] In one embodiment, the motor assembly 10 further includes a snap-fit ​​assembly 160, which axially snaps onto the end of the first tooth 121 and abuts against the end of the second tooth 133. The snap-fit ​​assembly 160 is used to limit the winding 140, preventing displacement of the winding 140 during operation of the motor assembly 10. The snap-fit ​​assembly 160 can be made of a material with insulating properties; or it can be made of a metal material covered with an insulating layer for insulation, which is not limited here. Specifically, after the shaped winding 140 is fitted onto the first tooth 121, the snap-fit ​​assembly 160 snaps onto the first tooth 121, and then the second tooth 133 of the end plate assembly 130 abuts against the snap-fit ​​assembly 160. In this embodiment, the motor assembly 10 is equipped with a snap-fit ​​component 160 to prevent the winding 140 from shifting during the operation of the motor assembly 10, thereby enhancing the reliability of the motor assembly 10. In addition, the snap-fit ​​component 160 can facilitate the fitting of the molded winding 140, which is convenient for the mass production of the winding 140.

[0038] In one embodiment, the snap-fit ​​assembly 160 is made of a soft magnetic composite material that has been treated with insulation, which gives the snap-fit ​​assembly 160 insulation properties and can reduce eddy currents; in addition, the snap-fit ​​assembly 160 has high magnetic permeability, and the snap-fit ​​assembly 160 can be used as part of the magnetic link of the motor assembly 10 to participate in electromagnetic energy conversion, so that the power density of the motor assembly 10 can be increased without increasing the effective electromagnetic space.

[0039] In one embodiment, the third axial dimension L3 of the snap-fit ​​assembly 160 is smaller than the first axial dimension L1 of the rotor core 110 and magnet 150 combined, and larger than the second axial dimension L2 of the stator core 120 and end plate assembly 130 combined. Understandably, along the radial direction, the axial dimensions of the rotor core 110 and magnet 150, the snap-fit ​​assembly 160, and the stator core 120 and end plate assembly 130 decrease sequentially. Alternatively, at both axial ends, the rotor core 110 and magnet 150 protrude from both ends of the snap-fit ​​assembly 160 and from both ends of the stator core 120 and end plate assembly 130; the snap-fit ​​assembly 160 protrudes from both ends of the stator core 120 and end plate assembly 130. In this embodiment, the third axial dimension L3 of the snap-fit ​​assembly 160 is greater than the second axial dimension L2 of the stator core 120 and the end plate assembly 130, so that the rotor core 110, the magnet 150, and the snap-fit ​​assembly 160 all have the function of focusing magnets, which can improve the power density of the motor assembly 10. In addition, when the third dimension of the snap-fit ​​assembly 160 coincides with the axial end of the winding 140, the power density of the motor assembly 10 can be increased without changing the volume of the motor assembly 10. Furthermore, the two ends of the snap-fit ​​assembly 160 in the axial direction can also serve as wire frames.

[0040] In one embodiment, the circumferential dimension of the snap-fit ​​assembly 160 is larger than the circumferential dimensions of the first tooth 121 and the second tooth 133. Understandably, the larger circumferential dimension of the snap-fit ​​assembly 160 compared to the first tooth 121 ensures that the radial projections of the first tooth 121 and the second tooth 133 fall within the snap-fit ​​assembly 160. Furthermore, since the snap-fit ​​assembly 160 possesses strong magnetic conductivity, the side of the snap-fit ​​assembly 160 closest to the magnet 150 in this embodiment can also serve as a pole shoe, "guiding" and "diffusing" the magnetic field of the main magnetic pole into the air gap. This makes the magnetic field distribution within the air gap more uniform and closer to a sine wave, thereby reducing electromagnetic losses and vibration noise during the operation of the motor assembly 10.

[0041] In one embodiment, the snap-fit ​​assembly 160 includes two snap-fit ​​members 161. Each snap-fit ​​member 161 has an opening (not shown in the figure) and a groove 1612 communicating with the opening. One snap-fit ​​member 161 is located at one axial end of the first tooth 121, and the other snap-fit ​​member 161 is located at the other axial end of the first tooth 121. The motor assembly 10 includes the same number of snap-fit ​​assemblies 160 as the first tooth 121. Each snap-fit ​​assembly 160 includes two snap-fit ​​members 161 with grooves 1612. The openings of the two snap-fit ​​members 161 face the interior of the first tooth 121 and snap-fit ​​with the first tooth 121 from both axial ends of the stator core 120. By providing two snap-fit ​​members 161 to snap-fit ​​with the first tooth 121 from both axial ends, the snap-fit ​​assembly 160 of this embodiment makes the installation of the snap-fit ​​assembly 160 simple and convenient, and can improve the production efficiency of the motor assembly 10. In addition, the snap-fit ​​member 161 has a simple structure, is easy to process, and can reduce costs.

[0042] In one embodiment, a positioning portion 1611 is provided on the side of the snap-fit ​​member 161 that abuts against the end plate assembly 130. The positioning portion 1611 is configured to abut against the second tooth portion 133 to improve the assembly accuracy between the snap-fit ​​member 161 and the second tooth portion 133. Specifically, in the axial direction, the distance from the bottom wall of the groove 1612 to the end of the snap-fit ​​member 161 is greater than the axial distance of the positioning portion 1611. That is, the portion of the snap-fit ​​member 161 that protrudes from the stator assembly in the axial direction has magnetic focusing ability, which can improve the power density of the motor assembly 10.

[0043] In one embodiment, a protrusion 123 is formed radially at the end of the first tooth 121, and the circumferential dimension of the protrusion 123 is smaller than the circumferential dimension of the first tooth 121. The protrusion 123 is disposed within the groove 1612. It can be understood that, in the circumferential direction, the end of the first tooth 121 and the protrusion 123 have different dimensions, and the end dimension of the first tooth 121 is larger than the dimension of the protrusion 123 to form a boss, or in other words, the end of the first tooth 121 has a dovetail groove disposed within the groove 1612 of the snap-fit ​​member 161, which can enhance the connection stability between the snap-fit ​​member 161 and the first tooth 121.

[0044] In one embodiment, the stator core 120 is a one-piece core, wherein the one-piece core is made of a composite soft magnetic material. The stator core 120, integrally made of composite soft magnetic material, can be pure iron SMC, iron-phosphorus alloy SMC, iron-silicon alloy SMC, iron-cobalt alloy SMC, iron-nickel alloy SMC, etc., and is not limited thereto. The stator core 120 made of a specific composite soft magnetic material can be selected according to the application scenario. In this embodiment, the stator core 120 is integrally cast from composite soft magnetic material. The SMC core can reduce the eddy current loss of the motor assembly 10; in addition, the SMC core has higher permeability, and the motor assembly 10 with an SMC core can achieve higher power density in the same volume; furthermore, compared to a laminated stator core 120, the stator core 120 of this embodiment does not require subsequent assembly, which can accelerate the assembly rate of the motor assembly 10.

[0045] In one embodiment, the rotor core 110 is a one-piece core, wherein the one-piece core is made of a composite soft magnetic material. The rotor core 110, integrally made of composite soft magnetic material, can be pure iron SMC, iron-phosphorus alloy SMC, iron-silicon alloy SMC, iron-cobalt alloy SMC, iron-nickel alloy SMC, etc., and is not limited thereto. The rotor core 110 made of a specific composite soft magnetic material can be selected according to the application scenario. In this embodiment, the rotor core 110 is integrally cast from composite soft magnetic material. The SMC core can reduce the eddy current loss of the motor assembly 10; in addition, the SMC core has higher permeability, and the motor assembly 10 with an SMC core can achieve higher power density in the same volume; furthermore, compared with a laminated rotor core 110, the rotor core 110 of this embodiment does not require subsequent assembly, which can accelerate the assembly rate of the motor assembly 10.

[0046] In one embodiment, the rotor core 110 is an integral composite soft magnetic material rotor core 110, and the stator core 120 is an integral composite soft magnetic material stator core 120. The specific composite soft magnetic materials of the rotor core 110 and the stator core 120 can be the same, for example, both can be any one of pure iron SMC, iron-phosphorus alloy SMC, iron-silicon alloy SMC, iron-cobalt alloy SMC, iron-nickel alloy SMC, etc.; or the specific composite soft magnetic materials of the rotor core 110 and the stator core 120 can be different, for example, the stator core 120 can be an iron-phosphorus alloy SMC stator core 120, and the rotor core 110 can be any one of iron-silicon alloy SMC, iron-cobalt alloy SMC, iron-nickel alloy SMC, etc., which is not limited here.

[0047] The above are merely embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A motor assembly, characterized in that, The motor assembly includes: Rotor core (110); A stator core (120) is sleeved on the outer periphery of the rotor core (110), wherein the inner circumferential surface of the stator core (120) is provided with a plurality of first teeth (121) extending radially at intervals along its circumferential direction. An end plate assembly (130) is provided at both ends of the stator core (120) in its axial direction. The end plate assembly (130) is provided with a plurality of second teeth (133) that extend radially and have the same number as the first teeth (121) along the circumferential direction. The second teeth (133) are provided in a one-to-one correspondence with the first teeth (121). Multiple windings (140), the number of which is the same as the number of the first tooth (121), each of which is wound around the second tooth (133) and the first tooth (121); The end plate assembly (130) is made of soft magnetic composite material.

2. The motor assembly according to claim 1, characterized in that, The motor assembly also includes: Multiple magnets (150) are spaced apart along the circumferential direction on the outer periphery of the rotor core (110), wherein the first dimension of the rotor core (110) and the magnets (150) added together in the axial direction is greater than the second dimension of the stator core (120) and the end plate assembly (130) added together in the axial direction.

3. The motor assembly according to claim 2, characterized in that, The motor assembly also includes: The snap-fit ​​assembly (160) snaps into the end of the first tooth (121) along the axial direction and abuts against the end of the second tooth (133).

4. The motor assembly according to claim 3, characterized in that, The snap-fit ​​assembly (160) is made of a soft magnetic composite material that has been insulated.

5. The motor assembly according to claim 4, characterized in that, The third dimension of the snap-fit ​​assembly (160) in the axial direction is smaller than the first dimension and larger than the second dimension, and the two ends of the snap-fit ​​assembly in the axial direction protrude from the two ends of the stator end plate assembly and the stator core.

6. The motor assembly according to claim 4, characterized in that, The snap-fit ​​assembly (160) is larger in the circumferential direction than the first tooth (121) and the second tooth (133) are in the circumferential direction.

7. The motor assembly according to any one of claims 3-6, characterized in that, The snap-fit ​​assembly (160) includes: Two snap-fit ​​pieces (161) are provided with grooves (1612). One snap-fit ​​piece (161) is located at one end of the first tooth (121) in the axial direction, and the other snap-fit ​​piece (161) is located at the other end of the first tooth (121) in the axial direction.

8. The motor assembly according to claim 7, characterized in that, The end of the first tooth (121) is formed with a protrusion (123) along the radial direction, and the size of the protrusion (123) in the circumferential direction is smaller than the size of the first tooth (121) in the circumferential direction, wherein the protrusion (123) is provided in the groove (1612).

9. The motor assembly according to claim 1, characterized in that, The endplate assembly (130) includes: A plurality of first end plates (131) are disposed at the first end of the stator core (120) in the axial direction, wherein each first end plate (131) includes N second teeth (133) spaced apart along the circumferential direction. Multiple second end plates (132) are provided at the second end of the stator core (120) in the axial direction, wherein each second end plate (132) includes M second teeth (133) spaced apart along the circumferential direction, wherein M>=N, N>=1.

10. The motor assembly according to claim 9, characterized in that, The plurality of first end plates (131) are integrally formed; or The plurality of second end plates (132) are integrally formed.

11. The motor assembly according to claim 1, characterized in that, The stator core (120) is an integral stator core (120); and / or The rotor core (110) is an integral rotor core (110).

12. The motor assembly according to claim 11, characterized in that, The stator core (120) is a composite soft magnetic material stator core (120); and / or The rotor core (110) is a composite soft magnetic material rotor core (110).

Images