Stator structure, method of manufacturing a stator structure, and electric machine

Abstract

The application discloses a stator structure, a manufacturing method of the stator structure and a motor, and relates to the technical field of motor stators, wherein the stator structure comprises a plurality of mounting housings, a plurality of silicon steel sheet assemblies and a plurality of coil windings; the plurality of mounting housings are arranged in the circumferential direction of a central axis, and the mounting housings are provided with mounting cavities in the axial direction of the central axis; one silicon steel sheet assembly is arranged in each mounting cavity, and the silicon steel sheet assembly comprises a plurality of silicon steel sheets which are stacked in the radial direction of the central axis; and the plurality of coil windings are arranged on the circumferential sides of the plurality of mounting housings respectively, and are used for generating magnetic fields in the same direction as the central axis. In the technical scheme, the iron core is divided into a plurality of silicon steel sheets which are stacked in the radial direction of the central axis, so that the circulation path of eddy current in the silicon steel sheet can be effectively reduced, the eddy current loss can be reduced, and the heat generation can be reduced.

Description

Technical Field

[0001] This invention relates to the field of motor stator technology, and particularly to a stator structure, a method for manufacturing the stator structure, and a motor. Background Technology

[0002] Since the main magnetic flux of an axial flux motor is axial, the existing technology of stacking stator laminations along the axial direction generates closed current loops within the stator laminations when an alternating magnetic field passes through them. This produces a significant eddy current effect, which leads to energy loss and manifests as core heating. Furthermore, the axial gaps between the laminations further increase the magnetic reluctance in the magnetic circuit, reducing the overall magnetic flux that can pass through. This decrease in electromagnetic conversion efficiency and increase in internal motor losses can cause the motor temperature to rise too quickly.

[0003] Therefore, in the existing technology, based on the axial flux motor where the main flux direction is axial, the existing stator lamination arrangement has a serious problem of overheating. Summary of the Invention

[0004] The main objective of this invention is to propose a stator structure, a method for manufacturing the stator structure, and a motor. In particular, it relates to a stator structure designed to solve the problem of severe heat generation in existing stator lamination arrangements based on the axial flux motor, where the main flux direction is axial.

[0005] To achieve the above objectives, the stator structure proposed in this invention includes: multiple mounting housings, multiple silicon steel sheet assemblies, and multiple coil windings; the multiple mounting housings are arranged circumferentially around a central axis, and each mounting housing has a mounting cavity extending through it along the axial direction of the central axis; each mounting cavity contains one silicon steel sheet assembly, and each silicon steel sheet assembly includes multiple silicon steel sheets, which are stacked radially along the central axis; the multiple coil windings are respectively wound around the periphery of the multiple mounting housings to generate a magnetic field in the same direction as the central axis.

[0006] In one embodiment, the silicon steel sheet assembly includes a plurality of silicon steel sheet units, each of the silicon steel sheet units including a plurality of silicon steel sheets, the plurality of silicon steel sheet units being radially stacked along the central axis, and the radius of curvature of the plurality of silicon steel sheet units gradually increasing in the direction away from the central axis.

[0007] In one embodiment, the curvatures of the plurality of silicon steel sheets in the same silicon steel sheet unit are equivalent.

[0008] In one embodiment, two adjacent silicon steel sheets are spaced apart; and / or,

[0009] The silicon steel sheet has two ends in the circumferential direction along the central axis, and the ends are spaced apart from the mounting housing.

[0010] In one embodiment, the stator structure further includes a mounting plate, and a plurality of mounting housings are circumferentially fixedly arranged on one side of the mounting plate around the central axis.

[0011] In one embodiment, a liquid storage tray is provided on the side of the mounting plate facing away from the mounting housing. The liquid storage tray is provided with a liquid storage groove facing the opening of the mounting plate. The mounting plate covers the liquid storage groove to form a liquid storage cavity. The mounting plate is provided with a plurality of slots corresponding to the liquid storage cavity. The slots are provided corresponding to the mounting housing.

[0012] In one embodiment, the slot extends radially along the central axis.

[0013] In one embodiment, the stator structure further includes an end cover, which is disposed on the side of the mounting housing away from the mounting plate. The end cover is provided with a plurality of vent grooves that extend axially along the central axis at circumferential intervals, and the vent grooves are provided corresponding to the gap between two adjacent mounting housings.

[0014] The present invention also proposes a method for manufacturing a stator structure. The stator structure includes: multiple mounting housings, multiple silicon steel sheet assemblies, and multiple coil windings; the multiple mounting housings are arranged circumferentially around a central axis, and each mounting housing has a mounting cavity extending through it along the axial direction of the central axis; each mounting cavity contains one silicon steel sheet assembly, and each silicon steel sheet assembly includes multiple silicon steel sheets, which are stacked radially along the central axis; multiple coil windings are respectively wound around the periphery of the multiple mounting housings to generate a magnetic field in the same direction as the central axis.

[0015] Obtain the mounting housing and the various silicon steel sheets;

[0016] Multiple silicon steel sheets with similar radii of curvature are stacked and fixedly connected to form the silicon steel sheet unit;

[0017] Multiple silicon steel sheet units are stacked in ascending order of radius of curvature and fixedly connected to form the silicon steel sheet assembly;

[0018] The silicon steel sheet assembly is fixed in the mounting housing;

[0019] Obtain the mounting plate and fix the mounting housing on which the silicon steel sheet assembly is fixed to the mounting plate;

[0020] Obtain the liquid storage tray and fix the mounting plate to the liquid storage tray;

[0021] The coil winding is wound around the periphery of the mounting housing, and the end cap is fixedly connected to the mounting housing.

[0022] The present invention also proposes an electric motor, the electric motor including a stator structure, the stator structure including: multiple mounting housings, multiple silicon steel sheet assemblies and multiple coil windings; the multiple mounting housings are arranged circumferentially around a central axis, and each mounting housing has a mounting cavity extending through it along the axial direction of the central axis; each mounting cavity contains one silicon steel sheet assembly, and each silicon steel sheet assembly includes multiple silicon steel sheets, which are stacked radially along the central axis; the multiple coil windings are respectively wound around the periphery of the multiple mounting housings to generate a magnetic field in the same direction as the central axis.

[0023] The technical solution of this invention employs multiple silicon steel sheets arranged radially along the base within the same mounting cavity. In the prior art, the cross-sectional area of ​​a single silicon steel sheet and the mounting cavity are almost equal. However, in the technical solution of this invention, the sum of the cross-sectional areas of the multiple silicon steel sheets is only approximately equal to the cross-sectional area of ​​the mounting cavity. Therefore, the heat generation of a single silicon steel sheet in this invention is less. Compared with the prior art, both use multiple silicon steel sheets stacked together, resulting in a smaller overall heat generation corresponding to the heat generation of a single silicon steel sheet. To limit the mounting area of ​​the silicon steel sheets and facilitate the winding of the coil, multiple mounting housings are provided, each with a through mounting cavity. Furthermore, the arrangement of the silicon steel sheets in the above solution reduces heat generation based on the axial direction of the magnetic field with the central axis as the axis; therefore, the mounting cavity is axially continuous along the central axis. The coil winding is wound around the outer wall of the mounting housing to generate a magnetic field in the same direction as the central axis. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is an exploded view of an embodiment of the stator structure provided by the present invention;

[0026] Figure 2 for Figure 1 A partial schematic diagram of the middle stator structure;

[0027] Figure 3 for Figure 1 A partial schematic diagram of the middle stator structure.

[0028] Explanation of icon numbers:

[0029] 100. Stator structure; 1. Mounting housing; 11. Mounting cavity; 2. Silicon steel sheet assembly; 21. Silicon steel sheet unit; 211. Silicon steel sheet; 3. Coil winding; 4. Mounting plate; 41. Slot; 5. Liquid storage tray; 51. Liquid storage tank; 6. End cover; 61. Vent groove.

[0030] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention 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 the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] Furthermore, if the embodiments of this invention 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. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the 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. When 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 by this invention.

[0034] Since the main magnetic flux direction of an axial flux motor is axial, the existing technology of stacking stator laminations along the axial direction generates closed current loops within the stator laminations when an alternating magnetic field passes through them. This produces significant eddy current effects, leading to energy loss and manifesting as core heating. Furthermore, the axial gaps between the laminations further increase the magnetic reluctance in the magnetic circuit, reducing the overall magnetic flux that can pass through. This decrease in electromagnetic conversion efficiency and increase internal motor losses result in excessively rapid temperature rise. Therefore, the existing technology of stacking stator laminations along the axial direction of the main magnetic flux in an axial flux motor suffers from severe heat generation problems.

[0035] This invention proposes a stator structure.

[0036] Please see Figures 1 to 3 In one embodiment of the present invention, the stator structure 100 includes: multiple mounting housings 1, multiple silicon steel sheet assemblies 2, and multiple coil windings 3; the multiple mounting housings 1 are arranged circumferentially around a central axis, and each mounting housing 1 has a mounting cavity 11 extending through it along the axial direction of the central axis; each of the multiple silicon steel sheet assemblies 2 has one silicon steel sheet assembly 2 disposed in each mounting cavity 11, and each silicon steel sheet assembly 2 includes multiple silicon steel sheets 211, which are stacked radially along the central axis; the multiple coil windings 3 are respectively wound around the periphery of the multiple mounting housings 1 to generate a magnetic field in the same direction as the central axis. (The central axis is collinear with the central axes of the mounting plate 4, the liquid storage tray 5, and the end cover 6.)

[0037] The heating of silicon steel sheet 211 is caused by eddy currents, and the heat generation is related to the magnitude of the eddy currents. The generation of eddy currents can be calculated using Faraday's law of electromagnetic induction: ε = -dΦ / dt, where ε is the induced electromotive force generated by the alternating magnetic field, Φ is the magnetic flux, t is time, the sign indicates the direction, and dΦ / dt represents the rate of change of magnetic flux with time (differentializing the magnetic flux with respect to time). The resistance of silicon steel sheet 211 is R. According to Ohm's law, I = ε / R, where I is the corresponding induced current (eddy current). The heat generation is the integral of the heating power P over a period of time. The heating power P is calculated as follows: P = ε² / R = (-dΦ / dt)² / R = I²*R. Since the change in the magnetic field is not easily adjusted, reducing the value of the resistance R can reduce the heat generation. Eddy currents are generated in the cross-section of silicon steel sheet 211 perpendicular to the magnetic field direction. The larger the flow area of ​​the cross-section, the smaller the resistance of the eddy current loop, and the more severe the heat generation. Therefore, it is necessary to minimize the area through which the magnetic flux flows through a single silicon steel sheet 211 to reduce the heat generation of the single silicon steel sheet 211.

[0038] The technical solution of this invention employs multiple silicon steel sheets 211 arranged radially along the base within the same mounting cavity 11. In the prior art, the cross-sectional area of ​​a single silicon steel sheet 211 and the mounting cavity 11 are almost equal. However, in the technical solution of this invention, the sum of the cross-sectional areas of the multiple silicon steel sheets 211 is only approximately equal to the cross-sectional area of ​​the mounting cavity 11. Therefore, the heat generation of a single silicon steel sheet 211 in the technical solution of this invention is less. Compared with the prior art, both use multiple silicon steel sheets 211 stacked together, so the overall heat generation corresponding to the heat generation of a single silicon steel sheet 211 is smaller. To limit the mounting area of ​​the silicon steel sheets 211 and facilitate the winding of the coil, multiple mounting housings 1 are provided, each with a through mounting cavity 11. Furthermore, the arrangement of the silicon steel sheets 211 in the above solution reduces heat generation based on the axial direction of the magnetic field with the central axis. Therefore, the mounting cavity 11 is axially penetrating along the central axis. The coil winding 3 is wound around the outer wall of the mounting housing 1 to generate a magnetic field in the same direction as the central axis.

[0039] The low filling rate of silicon steel sheets 211 in the coil winding 3 of the stator structure 100 leads to the following problems: 1. Increased iron loss: A low filling rate of silicon steel sheets 211 means that there are more non-magnetic areas inside the iron core. These areas increase the generation of eddy currents, and eddy current losses increase accordingly, thus reducing the efficiency of the motor. 2. Reduced magnetic flux density: A low filling rate of silicon steel sheets 211 causes the magnetic flux path to become discontinuous, reducing the magnetic flux density and affecting the output power and efficiency of the motor. 3. Increased temperature rise: Due to the increased eddy current losses, the temperature rise of the motor will increase, which may lead to aging of the insulation material during long-term operation and shorten the service life of the motor. 4. Increased vibration and noise: The thermal effect and magnetic fluctuations generated by eddy currents may lead to increased vibration and noise in the motor, affecting the operating stability and user comfort of the motor. 5. Reduced mechanical strength: A low filling rate of silicon steel sheets 211 may lead to a decrease in the structural strength of the iron core, weakening its ability to resist mechanical stress and affecting the mechanical reliability of the motor. 6. Affected dynamic response of the motor: Due to the changes in magnetic flux density and iron loss, the dynamic response characteristics of the motor may be affected, such as changes in starting, acceleration, and braking performance. In conclusion, the filler ratio of silicon steel sheet 211 has a significant impact on motor performance. A low filler ratio can lead to various adverse effects, reducing the overall performance and reliability of the motor. Therefore, during the design and manufacturing process of motors, it is essential to ensure an appropriate filler ratio of silicon steel sheet 211 to optimize the motor's electromagnetic performance and operating efficiency.

[0040] Therefore, the filling rate of the silicon steel sheets 211 within the coil winding 3 needs to meet a certain numerical range. In one embodiment, the mounting cavity 11 is fan-shaped, and the silicon steel sheets 211 are stacked radially along the central axis. The radius of curvature of the corresponding mounting unit gradually increases away from the central axis, ensuring the mounting cavity 11 is filled sufficiently to prevent overfilling and the aforementioned adverse effects. The mounting unit is a silicon steel sheet unit 21, and the silicon steel sheet assembly 2 includes multiple silicon steel sheet units 21. These multiple silicon steel sheet units 21 are stacked radially along the central axis, and the radius of curvature of the multiple silicon steel sheet units 21 gradually increases away from the central axis. This maximizes the filling rate requirement.

[0041] Even when the 211 silicon steel sheet filling rate is insufficient, the following measures can be taken to reduce eddy current losses, thereby reducing heat generation: 1. Use thinner 211 silicon steel sheets: Using thinner 211 silicon steel sheets can reduce the path length of eddy currents, thus reducing eddy current losses. Although thinner 211 silicon steel sheets may increase the number of sheets and the spacing, it generally helps to reduce eddy current losses. 2. Optimize the core shape: The design should consider using a core with a small cross-sectional area and a long length to reduce eddy current losses. At the same time, a reasonable core shape can help improve the magnetic field distribution and reduce the generation of eddy currents. 3. Use a stacked structure: By dividing the core into multiple thin sheets and using insulating material to separate or space each sheet, the circulation path of eddy currents inside the core can be effectively reduced, thus reducing eddy current losses. 4. Improve the performance of the core wafers: Selecting silicon steel 211 material with higher resistivity can further reduce eddy current losses. 5. Adjust the magnetic flux density: Appropriately reducing the magnetic flux density in the transformer or increasing the effective area of ​​the core can reduce eddy current losses. 6. Use staggered windings: When winding the coil, using a staggered layout can make the magnetic fields of each part cancel each other out, reducing the generation of eddy currents.

[0042] If the mounting unit is changed from silicon steel sheet unit 21 to silicon steel sheet 211, then the size of each silicon steel sheet 211 in the same mounting cavity 11 will be different. Furthermore, a thinner silicon steel sheet 211 helps reduce the path length of eddy currents, thereby reducing eddy current losses. Therefore, a thinner silicon steel sheet 211 results in a larger quantity, and many silicon steel sheets 211 of different sizes increase the processing time and cost. Therefore, multiple silicon steel sheet units 21 include multiple silicon steel sheets 211, which are stacked radially along the central axis, with the curvature of the multiple silicon steel sheets 211 in the same silicon steel sheet unit 21 being roughly equivalent. This reduces processing complexity. This will create gaps between the silicon steel sheet assembly 2 and the mounting housing 1 on both sides of the central axis in the circumferential direction, reducing the silicon steel sheet 211 filling rate to some extent, but this will not have a significant impact; on the contrary, heat dissipation can be achieved through these gaps. The fill ratio of 211 silicon steel sheets is not always better the higher it is. The fill ratio primarily affects motor efficiency by influencing iron losses and the continuity of the magnetic circuit. A higher fill ratio typically reduces air gaps within the core, thus lowering eddy current losses, as eddy currents are mainly generated in non-magnetic regions of the core (such as air gaps). Furthermore, smaller air gaps help maintain a more uniform and continuous magnetic flux path, thereby improving permeability and overall motor efficiency. However, excessively high fill ratios can lead to increased mechanical stress, potentially affecting the insulation performance and long-term stability of the 211 silicon steel sheets. Additionally, overly dense stacking can complicate cooling, impacting the motor's thermal management and efficiency. Therefore, a balance must be struck between maximizing fill ratio to optimize efficiency and ensuring structural strength and heat dissipation when designing a motor.

[0043] Therefore, under the condition of meeting the fill rate requirements: adjacent silicon steel sheets 211 are spaced apart; and / or, the silicon steel sheets 211 have two ends in the circumferential direction along the central axis, the ends being spaced apart from the mounting housing 1. Adjacent silicon steel sheets 211 are spot-welded together to achieve a fixed connection while creating a small gap between them. A smaller air gap helps maintain a more uniform and continuous magnetic flux path, thereby improving magnetic permeability and the overall efficiency of the motor, and also facilitating heat dissipation. Furthermore, it enhances the overall internal strength of the silicon steel sheet assembly 2.

[0044] To securely mount the mounting housing 1 and the silicon steel sheet assembly 2, the stator structure 100 also includes a mounting plate 4, with multiple mounting housings 1 fixedly disposed on one side of the mounting plate 4. All of these can be fixedly connected by spot welding, thereby improving the overall structural strength of the stator structure 100.

[0045] In another embodiment, to cool the silicon steel sheet 211 and prevent temperature rise from significantly affecting the stator performance, a liquid storage pan 5 is provided on the side of the mounting plate 4 facing away from the mounting housing 1. The liquid storage pan 5 has a liquid storage groove 51 opening towards the mounting plate 4. The liquid storage groove 51 is annularly arranged, and its sidewalls enclose the mounting plate 4 to form a liquid storage cavity. The mounting plate 4 has multiple slots 41 corresponding to the liquid storage cavity, and these slots 41 correspond to the mounting housing 1. Liquid in the storage cavity can enter the mounting cavity 11 through the slots 41 of the mounting plate 4 to contact the silicon steel sheet for heat exchange and cooling. If the slot 41 extends circumferentially along the central axis, then some silicon steel sheets 211 may correspond to the slot 41, while others may block it. This would prevent the liquid in the storage chamber from entering the mounting cavity 11 through the slot 41 of the mounting plate 4 to exchange heat with the silicon steel sheets 211. To improve the cooling effect, the slot 41 extends radially along the central axis. The liquid in the storage chamber then enters the mounting cavity 11 through the gaps between adjacent silicon steel sheets 211, filling the gaps within the mounting cavity 11 and exchanging heat with the silicon steel sheets 211. The coolant in the mounting cavity 11 communicates with the outside through the slot 41, allowing for heat exchange with the environment. Further heat is released into the environment through the storage pan 5, effectively reducing the temperature inside the silicon steel sheets 211 in the stator structure 100. Furthermore, compared to other oil-cooled impregnated stators, this structure eliminates the need for a separate cavity around the stator to store the heat transfer oil, effectively saving space. By installing an upper end cover 6 on the axial side of the housing 1 outside the silicon steel sheet 211, the liquid coolant is sealed in the gap space and reservoir, preventing leakage. The liquid coolant in this invention can be heat transfer oil, water, or a mixture of water and ethylene glycol.

[0046] Because the gap within the mounting cavity 11 needs to be filled with liquid coolant for heat exchange, the opening at the end of the mounting cavity 11 furthest from the mounting plate 4 needs to be sealed, hence the end cap 6 is provided. Additionally, the end cap 6 serves to press down the winding coil, preventing it from loosening. Therefore, the end cap 6 is positioned on the side of the coil winding 3 furthest from the mounting plate 4, abutting against the coil winding 3. To cool the stator as a whole, the end cap 6 has multiple vent grooves 61 spaced circumferentially, extending axially along the central axis. These vent grooves 61 correspond to the gaps between adjacent mounting housings 1, allowing heat dissipation through airflow.

[0047] The present invention also proposes a method for manufacturing a stator structure 100. The stator structure 100 includes: multiple mounting housings 1, multiple silicon steel sheet assemblies 2, and multiple coil windings 3; the multiple mounting housings 1 are arranged circumferentially around a central axis, and each mounting housing 1 has a mounting cavity 11 extending through it along the axial direction of the central axis; each of the mounting cavities 11 contains one silicon steel sheet assembly 2, and each silicon steel sheet assembly 2 includes multiple silicon steel sheets 211, which are stacked radially along the central axis; the multiple coil windings 3 are respectively wound around the periphery of the multiple mounting housings 1 to generate a magnetic field in the same direction as the central axis;

[0048] Obtain the mounting housing 1 and the various silicon steel sheets 211;

[0049] Multiple silicon steel sheets 211 with similar radii of curvature are stacked and fixedly connected to form the silicon steel sheet unit 21;

[0050] Multiple silicon steel sheet units 21 are stacked in ascending order of radius of curvature and fixedly connected to form the silicon steel sheet assembly 2;

[0051] The silicon steel sheet assembly 2 is fixed in the mounting housing 1;

[0052] Obtain the mounting plate 4, and fix the mounting housing on which the silicon steel sheet assembly is fixed to the mounting plate;

[0053] Obtain the liquid storage tray 5 and fix the mounting plate to the liquid storage tray;

[0054] The coil winding 3 is wound around the periphery of the mounting housing, and the end cover 6 is fixedly connected to the mounting housing 1.

[0055] In embodiments of the present invention, the size and position of the outer mounting housing 1 of the silicon steel sheet assembly 2 are determined by determining the number of winding slots (the gap between two adjacent mounting housings 1) and the width of the winding slots. Taking a stator structure 100 with N winding slots as an example, the silicon steel sheets 211 are evenly distributed circumferentially with an interval angle of 360 / N degrees. To ensure that the slot width remains unchanged in the radial direction, the final installation area of ​​the silicon steel sheets 211 is a fan shape. The confirmation of the size and overall structural dimensions of the silicon steel sheet assembly 2 is carried out in the following manner: First, the inner and outer diameters Ro and Ri of the silicon steel sheet assembly 2 are determined. After determining the thickness δ of the outer mounting housing 1 of the silicon steel sheet 211, the maximum radial gap for placing the silicon steel sheet 211 can be determined. In order to improve the filling rate of the silicon steel sheet 211, the radius of curvature of the stamped and bent silicon steel sheet 211 should be between (Ro-δ) and (Ri+δ). The radius of curvature is determined according to actual needs. Generally speaking, in order to improve the filling rate of the silicon steel sheet 211, the radius of curvature needs to be as close as possible to (Ri+δ). The maximum number of silicon steel sheet units 2 is determined based on the thickness σ of a single layer of silicon steel sheet 211: num = [(Ro - Ri - 2δ) / σ]. Adjustments are made according to the specific number of silicon steel sheet units 2 and the gap between them. The total number of silicon steel sheet units 2 should ensure that num = the number of silicon steel sheets 211 within a single silicon steel sheet unit 2 × the total number of silicon steel sheet units 2. Then, the radial gap value of the silicon steel sheet unit 2 is determined based on the difference between the inner and outer diameters and the total thickness of the laminate. The dimensions of the outer shell of the silicon steel sheet 211 are determined by the overall width of the stator slots. First, the winding slot width SW is determined, and the shells of the silicon steel sheets 211 are arranged in the area of ​​two adjacent slots. Further, the dimensions of each silicon steel sheet unit 2 and the dimensions of a single silicon steel sheet 211 within the silicon steel sheet unit 2 are determined using the aforementioned method.

[0056] In this scheme, the inner and outer radii of the silicon steel sheet assembly 2 are first determined, and then the position of the winding slot is determined according to the size of the winding slot, thereby determining the installation position of the silicon steel sheet 211. The silicon steel sheet 211 is placed in a closed position by arranging the mounting shell 1 on the outer layer of the conventional tooth to facilitate the filling of liquid coolant. The winding is then installed. Since the stator tooth slot is an open slot before the end cover 6 is installed, the winding is easier to install compared to the stator tooth slot produced by the traditional winding process. After the winding is installed, the upper end cover 6 is welded. Based on the design of the stator tooth slot opening 41, the processing is simple and the installation is convenient, without the need for precise positioning algorithms and equipment.

[0057] This invention also proposes an electric motor, which includes a stator structure 100. The specific structure of the stator structure 100 is as described in the above embodiments. Since this motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The stator structure 100 includes: multiple mounting housings 1, multiple silicon steel sheet assemblies 2, and multiple coil windings 3; the multiple mounting housings 1 are arranged circumferentially around a central axis, and each mounting housing 1 has a mounting cavity 11 extending through it along the axial direction of the central axis; each mounting cavity 11 contains one silicon steel sheet assembly 2, and each silicon steel sheet assembly 2 includes multiple silicon steel sheets 211, which are stacked radially along the central axis; the multiple coil windings 3 are respectively wound around the periphery of the multiple mounting housings 1 to generate a magnetic field in the same direction as the central axis.

[0058] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A stator structure, characterized by, The application relates to a stator structure, comprising: a mounting plate; a plurality of mounting housings arranged on one side of the mounting plate in a circumferential direction around a central axis of the stator, and the mounting housings are provided with mounting cavities in an axial direction of the central axis; a plurality of silicon steel sheet assemblies, each of the mounting cavities is provided with one of the silicon steel sheet assemblies, each of the silicon steel sheet assemblies comprises a plurality of silicon steel sheets, and the silicon steel sheets are arranged in a radial direction of the central axis; a plurality of coil windings arranged on circumferential sides of the mounting housings respectively, and the coil windings are used for generating magnetic fields in the same direction as the central axis; an end cover arranged on a side of the mounting housings away from the mounting plate, and the end cover is provided with a plurality of air permeation grooves arranged in a circumferential direction and penetrating the end cover in the axial direction of the central axis, and the air permeation grooves are arranged corresponding to gaps between two adjacent mounting housings.

2. The stator structure of claim 1, wherein The silicon steel sheet assembly comprises a plurality of silicon steel sheet units, each of the silicon steel sheet units comprises a plurality of silicon steel sheets, the silicon steel sheet units are arranged in the radial direction of the central axis, and the radius of curvature of the silicon steel sheet units gradually increases in a direction away from the central axis.

3. The stator structure of claim 2, wherein The radius of curvature of the silicon steel sheets in the same silicon steel sheet unit is equivalent.

4. The stator structure of claim 1, wherein Two adjacent silicon steel sheets are arranged in a spaced manner; and / or The silicon steel sheet has two ends in a circumferential direction of the central axis, and the ends are arranged in a spaced manner with the mounting housings.

5. The stator structure of claim 1, wherein A liquid storage disc is arranged on a side of the mounting plate away from the mounting housings, the liquid storage disc is provided with a liquid storage groove arranged in an opening direction of the mounting plate, the mounting plate covers the liquid storage groove to form a liquid storage cavity, a plurality of grooves are arranged on the mounting plate corresponding to the liquid storage cavity, and the grooves are arranged corresponding to the mounting housings.

6. The stator structure of claim 5, wherein The grooves extend in the radial direction of the central axis.

7. A method of manufacturing a stator structure, characterized by, Based on the stator structure in any one of claims 5 to 6, a manufacturing method of the stator structure comprises the following steps: obtaining the mounting housings and the silicon steel sheets; arranging and fixedly connecting a plurality of silicon steel sheets with equivalent radius of curvature to form the silicon steel sheet units; arranging and fixedly connecting a plurality of the silicon steel sheet units in a manner that the radius of curvature gradually increases from small to large to form the silicon steel sheet assembly; fixing the silicon steel sheet assembly in the mounting housings; obtaining the mounting plate, and fixing the mounting housings fixed with the silicon steel sheet assembly on the mounting plate; obtaining the liquid storage disc, and fixedly connecting the mounting plate and the liquid storage disc; the coil windings are arranged on the circumferential sides of the mounting housings, and the end cover is fixedly connected with the mounting housings.

8. An electric machine characterized by The application further relates to a stator structure comprising the stator structure in any one of claims 1 to 6.

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