Stator and motor
By using a stator core design with a radial inner and outer layer split structure and multiple coil combinations, the problems of low stator structure stiffness and limited coils in the motor are solved, thereby improving the flexibility and efficiency of motor design.
Patent Information
- Application Number
- CN202520146097.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-01-21
AI Technical Summary
Due to limitations in manufacturing precision, the slot width of existing motor stator core structures cannot be reduced to zero, resulting in low overall structural rigidity. Furthermore, enamel film damage is easily generated between enameled wires, and the wire diameter and cross-sectional shape are also limited.
The stator core design adopts a radial inner and outer layer split structure. By combining the radial outer core and the radial inner core, and combining coil designs with various wire diameters and cross-sectional shapes, the generation of cogging torque is avoided and the flexibility of motor design is increased.
It improves the structural rigidity of the motor stator, enhances the flexibility of coil combination design, and allows for adjustment of wire diameter and cross-sectional shape according to different motor performance requirements, thereby improving motor efficiency and performance.
Smart Images
Figure CN223928138U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electric motors, and more particularly to a stator and an electric motor. Background Technology
[0002] Conventional motor stator cores are one-piece structures, requiring a certain slot width to accommodate the windings. In recent years, modular core structures have emerged, assembling multiple I-beam cores into a single, integrated core. This reduces the slot width and consequently decreases cogging torque.
[0003] It should be noted that the above description of the background technology is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background technology section of this application. Utility Model Content
[0004] The inventors discovered that in the existing structure described above, due to precision limitations in the production process, the slot width cannot be reduced to zero, and the stator core of this structure is assembled from multiple parts, resulting in low overall structural rigidity. Furthermore, since the stator coils are all wound with enameled wire around the stator core, both integrated stator cores and stator cores composed of multiple circumferentially assembled parts suffer from problems such as easy enamel film damage between enameled wires and limitations on the types of enameled wires (material, wire diameter, cross-sectional shape, etc. must be consistent).
[0005] To address one of the aforementioned problems or other similar issues, embodiments of this application provide a stator and a motor. By adopting a split structure of inner and outer layers for the stator core, the slot structure of the stator can be eliminated, avoiding the generation of cogging torque. At the same time, the flexibility of motor design is increased through various combinations of coil wire diameter and cross-sectional shape on the inner and outer split structures.
[0006] According to a first aspect of the embodiments of this application, a stator is provided, the stator comprising: a stator core, the stator core including a radially outer core and a radially inner core separately disposed in a radial direction, the radially outer core including a yoke and a plurality of first teeth equally spaced along the radially inner circumferential surface of the yoke and extending inward from the radially inner circumferential surface; the radially inner core including a cylindrical portion and a plurality of second teeth equally spaced along the radially outer circumferential surface of the cylindrical portion and extending outward from the radially outer circumferential surface, each of the second teeth being radially opposed to each of the first teeth; viewed axially, the cylindrical portion is uninterrupted. The stator core has a ring-shaped structure, wherein the radial outer end face of the second tooth is detachably connected to the radial inner end face of the first tooth; a first insulating member covering the outer peripheral surface of the first tooth of the stator core; a second insulating member covering the outer peripheral surface of the second tooth of the stator core; a first coil wound on the first insulating member; and a second coil wound on the second insulating member; wherein the diameter of the first coil is greater than or less than the diameter of the second coil, and the cross-sectional shape of the first coil is the same as or different from the cross-sectional shape of the second coil.
[0007] In some embodiments, each of the first teeth has a first positioning portion on its radial inner end face, and each of the second teeth has a second positioning portion on its radial outer end face. The second teeth and the first teeth are detachably engaged by the abutment of the second positioning portion and the first positioning portion.
[0008] In some embodiments, the first positioning part is a positioning groove and the second positioning part is a positioning protrusion, or the second positioning part is a positioning groove and the first positioning part is a positioning protrusion, and the second tooth and the first tooth are detachably engaged by engaging the positioning groove and the positioning protrusion.
[0009] In some embodiments, the radial outer end face of the second tooth and the radial inner end face of the first tooth are tightly fitted together.
[0010] In some embodiments, the stator core further includes a plurality of intermediate connecting portions, each of the intermediate connecting portions being disposed between each of the first teeth and the second teeth that are radially opposite to the first teeth. The radially outer end face of the intermediate connecting portion is detachably engaged with the radially inner end face of the first teeth, the radially inner end face of the intermediate connecting portion is detachably engaged with the radially outer end face of the second teeth, and the radially outer end face of the second teeth is detachably connected to the radially inner end face of the first teeth through the intermediate connecting portions.
[0011] In some embodiments, the ratio of the radial length of the first tooth to the radial length of the second tooth is 1:1; or, the ratio of the radial length of the first tooth to the radial length of the second tooth is in the range of 5:1 to 1:5.
[0012] In some embodiments, when viewed axially, the circumferential width of the radial inner end face of the first tooth is the same as or different from the circumferential width of the radial outer end face of the second tooth.
[0013] In some embodiments, when viewed axially, the circumferential width of the first tooth gradually decreases, increases, or remains constant from the radially outer side to the radially inner side; and / or when viewed axially, the circumferential width of the second tooth gradually decreases, increases, or remains constant from the radially inner side to the radially outer side.
[0014] In some embodiments, the radially outer iron cores of the same diameter are detachably engaged with the radially inner iron cores of different inner diameters; or,
[0015] The radially inner core of the same diameter and the radially outer core of different outer diameter are detachably joined.
[0016] According to a second aspect of the embodiments of this application, an electric motor is provided, the electric motor including the stator described in the first aspect above.
[0017] One of the beneficial effects of the embodiments of this application is that, according to the embodiments of this application, by dividing the stator core into radial inner and outer layers, the cylindrical part is in the shape of an uninterrupted ring, and is combined with pre-formed coils with various wire diameters and cross-sectional shapes, the generation of cogging torque is avoided while increasing the flexibility of the motor stator design.
[0018] Specific embodiments of this application are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of this application can be adopted. It should be understood that the embodiments of this application are not limited in scope. Within the spirit and scope of the appended claims, embodiments of this application include many changes, modifications, and equivalents. Attached Figure Description
[0019] The accompanying drawings, which form part of the specification, are used to provide a further understanding of the embodiments of this application and illustrate the implementation methods of this application, together with the textual description, to explain the principles of this application. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:
[0020] Figure 1This is a schematic diagram of the stator according to an embodiment of the first aspect of this application;
[0021] Figure 2 This is a schematic diagram of the radially outer iron core and the radially inner iron core of an embodiment of the first aspect of this application;
[0022] Figure 3 yes Figure 1 An enlarged view of the dashed box T1;
[0023] Figure 4 yes Figure 1 Another enlarged view of the dashed box T1;
[0024] Figure 5 This is a schematic diagram of the radial inner end face of the first tooth 1012 in an embodiment of the first aspect of this application;
[0025] Figure 6 This is a schematic diagram of the radial outer end face of the second tooth 1022 in an embodiment of the first aspect of this application;
[0026] Figure 7 This is a schematic diagram of the intermediate connection portion of an embodiment of the first aspect of this application;
[0027] Figure 8 This is a schematic diagram of a stator core consisting of a radially outer core of the same diameter and radially inner cores of different inner diameters, according to an embodiment of the first aspect of this application. Detailed Implementation
[0028] Referring to the accompanying drawings, the foregoing and other features of this application will become apparent from the following description. Specific embodiments of this application are specifically disclosed in the description and drawings, illustrating partial implementations in which the principles of this application may be employed. It should be understood that this application is not limited to the described embodiments; rather, it includes all modifications, variations, and equivalents falling within the scope of the appended claims.
[0029] In the embodiments of this application, the terms "first," "second," etc., are used to distinguish different elements by name, but do not indicate the spatial arrangement or chronological order of these elements, and these elements should not be limited by these terms. The term "and / or" includes any one or more of the terms listed in association and all combinations thereof. The terms "comprising," "including," "having," etc., refer to the presence of the stated features, elements, components, or assemblies, but do not exclude the presence or addition of one or more other features, elements, components, or assemblies.
[0030] In the embodiments of this application, the singular forms "a," "the," etc., including the plural forms, should be broadly understood as "a kind" or "a class" rather than limited to the meaning of "an." Furthermore, the term "the" should be understood to include both the singular and plural forms, unless the context explicitly indicates otherwise. Additionally, the term "according to" should be understood as "at least partially based on…," and the term "based on" should be understood as "at least partially based on…," unless the context explicitly indicates otherwise.
[0031] In the following description of this application, unless otherwise stated, the direction extending along or parallel to the central axis of the stator core is referred to as "axial"; the radial direction centered on the central axis is referred to as "radial"; the direction closer to the central axis is referred to as "radial inner" or "inner"; the direction farther from the central axis is referred to as "radial outer" or "outer"; and the direction around the central axis is referred to as "circumferential". It is worth noting that these are for illustrative purposes only and do not limit the orientation of the stator and / or motor during use and manufacture.
[0032] The embodiments of this application will now be described with reference to the accompanying drawings. These embodiments are merely exemplary and are not intended to limit the scope of this application.
[0033] First aspect of the embodiments
[0034] An embodiment of the first aspect of this application provides a stator. Figure 1 This is a schematic diagram of the stator according to an embodiment of the first aspect of this application, showing a schematic diagram of the stator when viewed along the axial direction; Figure 2 This is a schematic diagram of the radially outer iron core and the radially inner iron core of an embodiment of the first aspect of this application, showing a schematic diagram of the stator iron core when viewed along the axial direction; Figure 3 yes Figure 1 An enlarged view of the dashed box T1; Figure 4 yes Figure 1 Another enlarged view of the dashed box T1.
[0035] like Figures 1 to 4 As shown, the stator 1 may include: stator core 10, first insulating component 20, second insulating component 30, first coil 40 and second coil 50.
[0036] In the embodiments of this application, such as Figure 1 and Figure 2As shown, the stator core 10 includes a radially outer core 101 and a radially inner core 102 arranged separately in the radial direction. The radially outer core 101 includes a yoke 1011 and a plurality of first teeth 1012 that are equally spaced along the radially inner circumferential surface F1 of the yoke 1011 and extend inward from the radially inner circumferential surface F1. The radially inner core 102 includes a cylindrical portion 1021 and a plurality of second teeth 1022 that are equally spaced along the radially outer circumferential surface F2 of the cylindrical portion 1021 and extend outward from the radially outer circumferential surface F1. Each second tooth 1022 is radially opposed to each first tooth 1012. When viewed in the axial direction, the cylindrical portion 1021 is in the shape of an uninterrupted ring. The radially outer end face E2 of the second tooth 1022 is detachably connected to the radially inner end face E1 of the first tooth 1012.
[0037] like Figure 1 As shown, the first insulating member 20 covers the outer peripheral surface of the first tooth 1012 of the stator core 10, the second insulating member 30 covers the outer peripheral surface of the second tooth 1022 of the stator core 10, the first coil 40 is wound on the first insulating member 20, and the second coil 50 is wound on the second insulating member 30.
[0038] like Figure 3 As shown, the diameter of the first coil 40 is larger than the diameter of the second coil 50; as Figure 4 As shown, the cross-sectional shape of the first coil 40 is different from that of the second coil 50.
[0039] According to the above embodiment, by dividing the stator core 10 into radial inner and outer layers, the cylindrical part 1021 is in the shape of an uninterrupted ring, and is combined with the pre-formed first coil 40 and second coil 50 with various wire diameters and cross-sectional shapes, the generation of cogging torque is avoided while increasing the flexibility of the motor stator design.
[0040] In the embodiments of this application, Figure 3 An example is shown in which the diameter of the first coil 40 is larger than the diameter of the second coil 50, but the present application is not limited thereto. For example, the diameter of the first coil 40 may also be smaller than the diameter of the second coil 50. Figure 4 An example is shown in which the cross-sectional shape of the first coil 40 is different from that of the second coil 50, but the present application is not limited thereto. For example, the cross-sectional shape of the first coil 40 may also be the same as that of the second coil 50.
[0041] In the embodiments of this application, in addition to making the wire diameter and cross-sectional shape of the first coil 40 and the second coil 50 different, the materials of the first coil 40 and the second coil 50 can also be different. For example, the first coil 40 can be made of aluminum and the second coil 50 can be made of copper. This can save costs and simplify material preparation.
[0042] The efficiency or performance of the motor can also be adjusted by using a combination of first coil 40 and second coil 50 with different materials and / or wire diameters and / or cross-sectional shapes, thereby increasing the flexibility of motor design.
[0043] Figure 5 This is a schematic diagram of the radial inner end face of the first tooth 1012 in an embodiment of the first aspect of this application; Figure 6 This is a schematic diagram of the radial outer end face of the second tooth 1022 in an embodiment of the first aspect of this application.
[0044] In the embodiments of this application, such as Figure 5 and Figure 6 As shown, the radial inner end face E1 of the first tooth 1012 has a first positioning part E11, and the radial outer end face E2 of the second tooth 1022 has a second positioning part E21. The second tooth 1022 and the first tooth 1012 are detachably engaged by the abutment of the second positioning part E21 and the first positioning part E11.
[0045] Thus, the radially outer core 101 and the radially inner core 102 of the stator core 10 can be firmly joined by the first positioning part E11 and the second positioning part E21.
[0046] In the embodiments of this application, Figure 5 and Figure 6 Only the end faces of a first tooth 1012 and a second tooth 1022 are shown to have positioning portions, but this application is not limited to this. The radial inner end face E1 of each first tooth 1012 may have a first positioning portion E11, and the radial outer end face E2 of each second tooth 1022 may have a second positioning portion E21.
[0047] In the embodiments of this application, such as Figure 5 and Figure 6 As shown, the first positioning portion E11 of the first tooth 1012 can be a positioning groove, and the second positioning portion E21 of the second tooth 1022 can be a positioning protrusion. The second tooth 1022 and the first tooth 1012 can be detachably engaged through the engagement of the positioning groove and the positioning protrusion. Thus, the radially outer core 101 and the radially inner core 102 of the stator core 10 can be further and firmly engaged through the positioning groove and the positioning protrusion.
[0048] In the embodiments of this application, it is not limited to Figure 5 and Figure 6The first positioning part E11 of the first tooth 1012 shown is a positioning groove and the second positioning part E21 of the second tooth 1022 is a positioning protrusion. For example, the first positioning part E11 of the first tooth 1012 can also be a positioning protrusion, and the second positioning part E21 of the second tooth 1022 can also be a positioning protrusion.
[0049] In the embodiments of this application, such as Figure 5 and Figure 6 As shown, when viewed along the axial direction, the positioning groove and the positioning protrusion are triangular, but this application is not limited to this. For example, the positioning groove and the positioning protrusion can also be other shapes such as trapezoidal or dovetail.
[0050] In this embodiment, the radially outer end face E2 of the second tooth 1022 and the radially inner end face E1 of the first tooth 1012 are tightly fitted together. That is, the radially outer end face E2 of the second tooth 1022 and the radially inner end face E1 of the first tooth 1012 can be tightly abutted (joined) together, or the two are tightly fitted without gaps. As a result, the radially outer core 101 and the radially inner core 102 can be further firmly assembled into one unit, and the overall stator core has high structural rigidity.
[0051] The above describes that the radial outer core 101 and the radial inner core 102 are detachably engaged by a snap-fit method through the first tooth 1012 and the second tooth 1022. However, this application is not limited to this. The radial outer core 101 and the radial inner core 102 can also be detachably connected by other methods through the first tooth 1012 and the second tooth 1022.
[0052] For example, the stator core 10 may also include multiple intermediate connecting parts 103 (such as... Figure 7 As shown, the radial outer end face E2 of the second tooth 1022 and the radial inner end face E1 of the first tooth 1012 are detachably connected through the intermediate connecting part 103. That is to say, the radial outer iron core 101 and the radial inner iron core 102 can also be detachably connected through the intermediate connecting part 103.
[0053] Figure 7 This is a schematic diagram of one of a plurality of intermediate connecting portions in an embodiment of the first aspect of this application. Figure 7 The left side shows a schematic diagram when the middle connecting part is not engaged with the first tooth and the second tooth. Figure 7 The right side shows a schematic diagram of the intermediate connecting part after it is engaged with the first tooth and the second tooth.
[0054] like Figure 7As shown, the intermediate connecting portion 103 is disposed between the first tooth portion 1012 and the second tooth portion 1022 which is radially opposite to the first tooth portion 1012. The radially outer end face E3 of the intermediate connecting portion 103 is detachably engaged with the radially inner end face E1 of the first tooth portion 1012, and the radially inner end face E4 of the intermediate connecting portion 103 is detachably engaged with the radially outer end face E2 of the second tooth portion 1022.
[0055] The engagement method between the radially outer end face E3 of the intermediate connecting portion 103 and the radially inner end face E1 of the first tooth portion 1012 can be as follows: Figure 7 The positioning protrusion and positioning groove shown are engaged, but the connection is not limited to an engaged connection. Furthermore, the positioning protrusion and positioning groove are not limited to the following... Figure 7 The triangular interlocking shown can also be, for example, a trapezoidal interlocking or a dovetail interlocking.
[0056] The intermediate connecting part 103 can further increase the flexibility of stator core design.
[0057] In the embodiments of this application, such as Figure 2 As shown, the ratio of the radial length D1 of the first tooth 1012 to the radial length D2 of the second tooth 1022 is approximately 1:1. That is, the boundary point between the radially outer core 101 and the radially inner core 102 is located at the midpoint of the radial direction of the entire stator core. However, this application is not limited to this. The ratio of the radial length D1 of the first tooth 1012 to the radial length D2 of the second tooth 1022 can range from approximately 5:1 to 1:5. That is, the radial length D1 of the first tooth 1012 can be approximately 5 times the radial length D2 of the second tooth 1022, or the radial length D2 of the second tooth 1022 can be approximately 5 times the radial length D1 of the first tooth 1012. Specifically, the ratio of the radial length D1 of the first tooth 1012 to the radial length D2 of the second tooth 1022 can be determined according to the application scenario and performance of the motor.
[0058] This increases the flexibility of stator core design.
[0059] In the embodiments of this application, such as Figure 2 As shown, when viewed along the axial direction, the circumferential width C1 of the radial inner end face E1 of the first tooth 1012 is the same as the circumferential width C2 of the radial outer end face E2 of the second tooth 1022. However, this application is not limited to this. For example, the circumferential width C1 of the radial inner end face E1 of the first tooth 1012 and the circumferential width C2 of the radial outer end face E2 of the second tooth 1022 may also be different. That is to say, the circumferential widths of the first tooth 1012 and the second tooth 1022 can be adjusted to adapt to the wire diameter and number of turns of the coil required under different motor performance conditions, so as to increase the flexibility of motor design.
[0060] For example, the circumferential width C1 of the radial inner end face E1 of the first tooth 1012 can be smaller than the circumferential width C2 of the radial outer end face E2 of the second tooth 1022. The cross-sectional shape of the first coil 40 and the second coil 50 is, for example, circular. In this case, the diameter of the first coil 40 can be larger than the diameter of the second coil 50.
[0061] For example, the circumferential width C1 of the radial inner end face E1 of the first tooth 1012 can be greater than the circumferential width C2 of the radial outer end face E2 of the second tooth 1022. The cross-sectional shape of the first coil 40 and the second coil 50 is, for example, circular. In this case, the diameter of the first coil 40 can also be greater than the diameter of the second coil 50.
[0062] For example, the circumferential width C1 of the radial inner end face E1 of the first tooth 1012 can be greater than the circumferential width C2 of the radial outer end face E2 of the second tooth 1022. In this case, the cross-sectional shape of the first coil 40 can be rectangular, and the cross-sectional shape of the second coil 50 can be circular.
[0063] The above examples are merely illustrative and are not limited to these examples. Other combinations of the circumferential widths of the first tooth 1012 and the second tooth 1022 with the first coil 40 and the second coil 50 having different wire diameters and cross-sectional shapes are also possible.
[0064] Therefore, by designing different circumferential widths of the first tooth 1012 and the second tooth 1022, the flexibility of motor design can be further increased to meet the performance requirements of different motors.
[0065] In the embodiments of this application, the circumferential width C1 of the first tooth 1012 and the circumferential width C2 of the second tooth 1022 are described above as remaining constant from the radially outer side to the radially inner side. That is, when viewed axially, the cross-sectional shape of the first tooth 1012 and the second tooth 1022 is rectangular. However, this application is not limited to this. The circumferential width C1 of the first tooth 1012 may gradually decrease or gradually increase from the radially outer side to the radially inner side, and / or the circumferential width C2 of the second tooth 1022 may gradually decrease or gradually increase from the radially inner side to the radially outer side. In other words, when viewed axially, the cross-sectional shape of the first tooth 1012 may be a trapezoid that gradually increases from the inside to the outside or a trapezoid that gradually decreases from the inside to the outside, and / or the cross-sectional shape of the second tooth 1022 may be a trapezoid that gradually increases from the inside to the outside or a trapezoid that gradually decreases from the inside to the outside. This further increases the flexibility of motor design.
[0066] In this embodiment of the application, the circumferential width T1 of the intermediate connecting portion 103 (e.g., Figure 7As shown, the circumferential width C1 of the first tooth 1012 and the circumferential width C2 of the second tooth 1022 can vary with changes in the circumferential width C1 of the first tooth 1012 and the second tooth 1022. For example, when viewed axially, if the cross-sectional shape of the first tooth 1012 is a trapezoid that gradually increases from the inside to the outside and the cross-sectional shape of the second tooth 1022 is a trapezoid that gradually increases from the inside to the outside, the circumferential width T1 of the intermediate connecting portion 103 can be a trapezoid that gradually decreases radially from the inside to the outside. That is, when viewed axially, the cross-sectional shape of the intermediate connecting portion 103 is not limited to... Figure 7 The rectangle shown can have a cross-sectional shape that can vary with the cross-sectional shape of the first tooth 1012 and the second tooth 1022. This allows for further adjustment of the circumferential width of the first tooth 1012, the second tooth 1022, and the intermediate connecting portion 103 to accommodate the coil diameter and number of turns required for different motor performance requirements, thereby increasing the flexibility of motor design.
[0067] Figure 8 This is a schematic diagram of a stator core consisting of a radially outer core of the same diameter and radially inner cores of different inner diameters, according to an embodiment of the first aspect of this application.
[0068] In the embodiments of this application, such as Figure 8 As shown, the stator cores on the left and right sides have radially outer cores 101 with the same diameter P1, but the inner diameter W1 of the radially inner core 102 of the stator core on the right side is smaller than the inner diameter W2 of the radially inner core 102 of the stator core on the left side. That is to say, the radially outer core 101 with the same diameter can be detachably connected with the radially inner core 102 with different inner diameters; thereby, the flexibility of motor design is further increased to meet the performance requirements of different motors.
[0069] However, this application is not limited to this, except Figure 8 In addition to the example shown, for example, the radially inner core 102 of the same diameter can be detachably joined with the radially outer core 101 of different outer diameters, which can also increase the flexibility of motor design.
[0070] The above description only describes the configuration related to the stator in the embodiments of this application. This application is not limited to this. The stator may also include other conventional configurations, such as multiple terminals. For details, please refer to related technologies, which are omitted here.
[0071] According to the stator of the present application embodiment, by dividing the stator core 10 into radial inner and outer layers, the cylindrical part 1021 is in the shape of an uninterrupted ring, and is combined with the pre-formed first coil 40 and second coil 50 having various wire diameters and cross-sectional shapes, the generation of cogging torque is avoided while increasing the flexibility of the motor stator design.
[0072] Second aspect of the embodiments
[0073] The second aspect of this application provides an electric motor, which includes a stator 1 as described in the first aspect embodiment. Since the main structure of the stator 1 has been described in detail in the first aspect embodiment, its contents are included herein and will not be repeated here.
[0074] The motor may also include: a rotating shaft extending along a central axis; and a rotor that rotates about the rotating shaft and is opposed to the stator 1 in the circumferential direction.
[0075] The above description only describes the configuration of the motor in the embodiments of this application. This application is not limited to this. The motor may also include other conventional configurations. For details, please refer to the relevant technology. The description is omitted here.
[0076] According to the embodiments of the present application, the stator core 10 of the stator 1 of the motor is divided into radial inner and outer layers, and the cylindrical part 1021 is in the shape of an uninterrupted ring. It is combined with the pre-formed first coil 40 and second coil 50 with various wire diameters and cross-sectional shapes, which avoids the generation of cogging torque and increases the flexibility of the stator design of the motor.
[0077] The present application has been described above with reference to specific embodiments. However, those skilled in the art should understand that these descriptions are exemplary and not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on its spirit and principles, and these modifications and variations are also within the scope of the present application.
[0078] Preferred embodiments of this application have been described above with reference to the accompanying drawings. Many features and advantages of these embodiments are apparent from this detailed description, and therefore the appended claims are intended to cover all such features and advantages of these embodiments that fall within their true spirit and scope. Furthermore, since many modifications and alterations will readily occur to those skilled in the art, the embodiments of this application are not intended to be limited to the precise structures and operations illustrated and described, but rather to encompass all suitable modifications and equivalents falling within their scope.
Claims
1. A stator characterized by, The stator comprises: a stator core comprising a radially outer core and a radially inner core arranged in a radial direction, the radially outer core comprising a yoke portion and a plurality of first tooth portions equally spaced along and extending inwardly from a radially inner circumferential surface of the yoke portion, the radially inner core comprising a cylindrical portion and a plurality of second tooth portions equally spaced along and extending outwardly from a radially outer circumferential surface of the cylindrical portion, each of the second tooth portions being radially opposite to each of the first tooth portions, the cylindrical portion being a continuous annular ring in an axial direction, and radially outer end surfaces of the second tooth portions being detachably connected to radially inner end surfaces of the first tooth portions; a first insulating member covering outer circumferential surfaces of the first tooth portions of the stator core; a second insulating member covering outer circumferential surfaces of the second tooth portions of the stator core; a first coil wound on the first insulating member; and a second coil wound on the second insulating member; wherein a diameter of the first coil is greater than or less than a diameter of the second coil, a cross-sectional shape of the first coil is the same as or different from a cross-sectional shape of the second coil.
2. The stator of claim 1, wherein each of the radially inner end surfaces of the first tooth portions has a first positioning portion, and each of the radially outer end surfaces of the second tooth portions has a second positioning portion, the second tooth portions and the first tooth portions are detachably engaged by abutment of the second positioning portions and the first positioning portions.
3. The stator of claim 2, wherein the first positioning portions are positioning recesses, and the second positioning portions are positioning protrusions, or the second positioning portions are positioning recesses, and the first positioning portions are positioning protrusions, the second tooth portions and the first tooth portions are detachably engaged by snap connection of the positioning recesses and the positioning protrusions.
4. The stator of any one of claims 1 to 3, characterized in that, the radially outer end surfaces of the second tooth portions and the radially inner end surfaces of the first tooth portions are in close abutment.
5. The stator of any one of claims 1 to 3, wherein, the stator core further comprises a plurality of intermediate connecting portions, each of the intermediate connecting portions being arranged between each of the first tooth portions and the second tooth portion radially opposite to the first tooth portion, a radially outer end surface of the intermediate connecting portion being detachably engaged with a radially inner end surface of the first tooth portion, and a radially inner end surface of the intermediate connecting portion being detachably engaged with a radially outer end surface of the second tooth portion, the radially outer end surfaces of the second tooth portions and the radially inner end surfaces of the first tooth portions are detachably connected by the intermediate connecting portions.
6. The stator of claim 1, wherein a ratio of a radial length of the first tooth portions to a radial length of the second tooth portions is 1:1; or a ratio of a radial length of the first tooth portions to a radial length of the second tooth portions is in a range of 5:1 to 1:
5.
7. The stator of claim 1, wherein circumferential widths of the radially inner end surfaces of the first tooth portions and circumferential widths of the radially outer end surfaces of the second tooth portions are the same or different in an axial direction.
8. The stator of claim 7, wherein circumferential widths of the first tooth portions gradually decrease or gradually increase or remain unchanged from a radially outer side to a radially inner side in an axial direction; and / or circumferential widths of the second tooth portions gradually decrease or gradually increase or remain unchanged from a radially inner side to a radially outer side in an axial direction.
9. The stator of claim 1, wherein The radially outer core with the same diameter and the radially inner core with the different inner diameter are detachably engaged; or, The radially inner core with the same diameter and the radially outer core with the different outer diameter are detachably engaged.
10. An electric machine characterized by The motor comprises the stator according to any one of claims 1 to 9.