Stator lamination, stator construction and electric machine

Abstract

This utility model provides a stator lamination, a stator structure, and a motor. The stator lamination includes: a yoke, which is an annular structure; multiple stator teeth arranged sequentially along an annular trajectory on the yoke, with stator slots formed between any two adjacent stator teeth; a shoe-shaped part at the end of any stator tooth away from the yoke, with a tangent M on the side of the shoe-shaped part facing the center P of the stator lamination. The tangent M is arc-shaped, and the center Q of the circle containing the tangent M is offset from the center P of the stator lamination. The stator lamination of this utility model solves the technical problems of excessive vibration and noise during motor operation in related technologies.

Description

Technical Field

[0001] This utility model relates to the field of motor design, specifically to a stator lamination, a stator structure, and a motor. Background Technology

[0002] In the field of motor design, high power density is one of the main directions of motor development. However, in related technologies, increasing motor power density means that the unit volume of the motor must withstand higher power, which exacerbates vibration and noise issues. As household appliances face increasingly stringent requirements for vibration and noise performance, it is necessary to consider how to optimize motor vibration and noise while simultaneously increasing power density. Current motor technologies cannot completely solve the problem of excessive vibration and noise during operation.

[0003] It is evident that the relevant technologies suffer from excessive vibration and noise during motor operation. Currently, no effective solution has been proposed to address these issues.

[0004] The information disclosed in the background section is only intended to enhance the understanding of the background art described herein. Therefore, the background art may contain information that would not be considered part of the prior art by those skilled in the art. Utility Model Content

[0005] The main purpose of this utility model is to provide a stator lamination, stator structure and motor to solve the technical problems of excessive vibration and noise during motor operation in related technologies.

[0006] To achieve the above objectives, according to one aspect of the present invention, a stator lamination is provided, comprising: a yoke portion having an annular structure; a plurality of stator teeth arranged sequentially along an annular trajectory on the yoke portion, with a stator groove formed between any two adjacent stator teeth; a boot portion provided at the end of any stator tooth away from the yoke portion, with a tangent M provided on the side of the boot portion facing the center P of the stator lamination, wherein the shape of the tangent M is an arc, and the center Q of the circle containing the tangent M is offset from the center P of the stator lamination.

[0007] Furthermore, for any stator tooth, its extension direction is the first direction, and the center Q of the circle containing the tangent M is spaced apart from the center P of the stator lamination along the second direction, which is perpendicular to the first direction.

[0008] Furthermore, along the second direction, the distance between the center Q of the circle containing the tangent M and the center P of the stator lamination is a; along the second direction, the maximum width of the boot is b, where a / b≤1 / 2.

[0009] Furthermore, along the circumference of the stator lamination, one end of the tangent M extends to the first end of the boot section, and the other end of the tangent M extends to the second end of the boot section, with the first end and the second end being the two opposite ends of the boot section.

[0010] Furthermore, along the circumferential direction of the stator lamination, one end of the tangent M extends to the first end of the boot section, and the other end of the tangent M is located between the first end and the second end of the boot section, with the first end and the second end being the opposite ends of the boot section.

[0011] Furthermore, the other end of the cut edge M is equidistant from the first end and the second end of the boot.

[0012] Furthermore, the rotor of the motor where the stator laminations are located rotates from the first end to the second end.

[0013] Furthermore, the depth of the tangent M is less than the thickness of the boot portion, wherein the depth of the tangent M is the dimension of the tangent M along the radial direction of the stator lamination, and the thickness of the boot portion is the dimension of the boot portion along the radial direction of the stator lamination.

[0014] According to another aspect of the present invention, a stator structure is provided, the stator structure including a plurality of stator laminations, the plurality of stator laminations being stacked sequentially, wherein the stator laminations are the stator laminations described above.

[0015] According to another aspect of the present invention, an electric motor is provided, comprising: a stator structure, wherein the stator structure is as described above; and a rotor, wherein the rotor is rotatably mounted within the stator structure.

[0016] The stator lamination using the technical solution of this utility model includes: a yoke, which is an annular structure; multiple stator teeth, which are sequentially arranged along an annular trajectory on the yoke, with stator slots formed between any two adjacent stator teeth to allow coils to be wound within the slots; a shoe portion is provided at the end of any stator tooth away from the yoke, and a tangent M is provided on the side of the shoe portion facing the center P of the stator lamination, wherein the tangent M is arc-shaped, and the center Q of the circle containing the tangent M is offset from the center P of the stator lamination. With this structural design, the stator lamination, by providing an eccentric arc tangent on the inner side of the shoe portion, ensures that the distance from various positions on the inner side of the shoe portion to the center P of the stator lamination is unequal. When installed in a motor, the distance from the shoe portion to the rotor will exhibit a characteristic of being larger on one side and smaller on the other, thus altering the air gap of the motor. By performing asymmetrical eccentric arc cutting on the stator lamination shoe, the characteristics of unidirectional motor operation can be well adapted. By changing the air gap at various positions of the motor through the edge cutting structure, the magnetic flux density on one side of the shoe is reduced, thereby reducing the electromagnetic force at that position. In practical applications, this can reduce the electromagnetic force and torque pulsation generated during motor operation, thereby reducing the noise generated during motor operation and solving the technical problems of excessive vibration and noise during motor operation in related technologies. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 This is a schematic diagram of the structure of an embodiment of the stator lamination of this utility model;

[0019] Figure 2 This is an enlarged structural diagram of a partial area of ​​an embodiment of the stator lamination of this utility model (partial arc segments of circles A and B are shown in the figure);

[0020] Figure 3 This is an enlarged structural diagram of a partial area of ​​an embodiment of the stator lamination of this utility model (two reference circles, circle A and circle B, are shown in the figure);

[0021] Figure 4 This is a partially enlarged structural schematic diagram of an optional embodiment of the stator lamination of this utility model;

[0022] Figure 5 This is a partially enlarged structural schematic diagram of another optional embodiment of the stator lamination of this utility model;

[0023] Figure 6 This is a schematic diagram of the structure of an embodiment of the motor of this utility model;

[0024] Figure 7 This is a schematic diagram of the magnetic flux density distribution during motor operation in related technologies;

[0025] Figure 8 This is a comparison diagram of the electromagnetic force density of the motor in this embodiment of the present invention and the motor in a conventional solution;

[0026] Figure 9 This is a comparison diagram of the torque pulsation of the motor in this embodiment of the present invention and the motor in a conventional solution.

[0027] The above figures include the following reference numerals:

[0028] 1. Yoke; 2. Stator teeth; 3. Boot; 4. Stator slot; 5. Coil; 10. Stator structure; 20. Rotor. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] In related technologies, the inner side of the stator laminations of electric motors is typically a uniform arc, resulting in a uniform air gap (commonly 0.3mm to 0.5mm) between all locations of the laminations and the outer edge of the rotor. The applicant discovered that during rotor rotation, the magnetic flux density is always concentrated on one side of the lamination, while the magnetic flux density is lower on the other side. For example, in a unidirectional rotating motor, the magnetic flux density is always highest on the side where the rotor is turning towards the lamination, while the magnetic flux density is lower on the side where the rotor is moving away from the lamination. For example, in a counter-clockwise rotating motor, the side with higher magnetic flux density is the right lamination. This concentration of magnetic flux density on one side of the lamination causes the electromagnetic force to act primarily on the stator teeth through the air gap, leading to motor vibration and noise problems. Figure 7 This is a schematic diagram of the magnetic flux density distribution during motor operation in related technologies, such as... Figure 7 As shown, different colors represent different magnetic flux density conditions. As the color changes from cold to warm, the magnetic flux density gradually increases. When the rotor rotates counterclockwise, the position with the highest magnetic flux density in the shoe is always on the side where the rotor turns towards the shoe, while the magnetic flux density in the shoe is smaller on the side where the rotor leaves the shoe. This situation of localized magnetic flux density will lead to uneven distribution of electromagnetic force, resulting in increased motor vibration and noise.

[0031] Please refer to Figures 1 to 9 To address the technical problems described in the background section, embodiments of this utility model provide a stator lamination, comprising: a yoke 1, the yoke 1 being an annular structure; multiple stator teeth 2, the multiple stator teeth 2 being sequentially arranged on the yoke 1 along an annular trajectory, with a stator groove 4 formed between any two adjacent stator teeth 2, so that a coil 5 can be wound in the stator groove 4; a boot 3 is provided at the end of any stator tooth 2 away from the yoke 1, and a tangent M is provided on the side of the boot 3 facing the center P of the stator lamination, wherein the shape of the tangent M is an arc, and the center Q of the circle containing the tangent M is offset from the center P of the stator lamination.

[0032] The stator lamination with this structural design, by setting an eccentric arc-shaped cut edge M on the inner side of the shoe portion 3, makes the distance from various positions on the inner side of the shoe portion 3 to the center P of the stator lamination unequal. When installed in the motor, the distance from the shoe portion 3 to the rotor 20 will exhibit a characteristic of being larger on one side and smaller on the other, thus changing the air gap of the motor. By performing asymmetrical eccentric arc cutting on the stator lamination shoe portion 3, it can well adapt to the unidirectional operation characteristics of the motor. By changing the air gap at various positions of the motor through the cut edge structure, the magnetic flux density on one side of the shoe portion 3 is reduced, thereby reducing the electromagnetic force at that position. In practical applications, it can reduce the electromagnetic force and torque pulsation generated during motor operation, thereby reducing the noise generated during motor operation and solving the technical problems of excessive vibration and noise during motor operation in related technologies.

[0033] Specifically, such as Figure 2 and Figure 3As shown, for any stator tooth 2, its extension direction is the first direction, and the center Q of the circle where the tangent edge M is located is spaced apart from the center P of the stator lamination along the second direction, which is perpendicular to the first direction.

[0034] like Figure 2 and Figure 3 As shown in the figure, the stator tooth 2 has a chamfered edge M structure in its shoe portion 3. The stator tooth 2 extends along a first direction (vertical direction in the figure), and the width direction of the shoe portion 3 is a second direction (horizontal direction in the figure). The center of the stator lamination is point P, and the center of circle A in the figure is also point P. In related technologies, the inner side of the shoe portion 3 is formed by cutting circle A. However, in this embodiment, the chamfered edge M on the inner side of the shoe portion 3 is formed by cutting circle B. Compared with circle A, the center Q of circle B is spaced apart from the center P of the stator lamination along the second direction. In this way, by translating the cutting circle along the second direction, the magnetic flux density distribution during motor rotation can be better adapted, and the gradually changing air gap chamfered edge M can be accurately and effectively cut, making the magnetic flux density distribution of the shoe portion 3 more uniform and avoiding the situation where excessive magnetic flux density concentration in local areas leads to increased noise.

[0035] In a preferred embodiment, along the second direction, the distance between the center Q of the circle containing the tangent M and the center P of the stator lamination is a; along the second direction, the maximum width of the boot portion 3 is b, where a / b≤1 / 2.

[0036] like Figure 3 As shown, the center of circle A containing the cutting edge M is Q, and the distance between it and the center P of the stator lamination is a. The width of the shoe part 3 along the second direction is b, where a / b≤1 / 2, that is, a≤0.5b. In this way, a cutting edge with appropriate size and shape can be formed, ensuring that the air gap is larger on one side and smaller on the other side, reducing the gap in the local magnetic concentration, and ensuring good air gap uniformity.

[0037] In actual implementation, the relative positional relationship between the cut edge M and the boot part 3 can be different:

[0038] In one alternative embodiment, along the circumferential direction of the stator lamination, one end of the tangent M extends to the first end of the boot portion 3, and the other end of the tangent M extends to the second end of the boot portion 3, with the first end and the second end being opposite ends of the boot portion 3.

[0039] like Figure 5 As shown, in this embodiment, one end of the tangent M extends to the first end of the boot portion 3, and the other end of the tangent M extends to the second end of the boot portion 3. That is, along the circumference of the stator lamination, the tangent M penetrates the boot portion 3. At this time, the side of the boot portion 3 facing the center of the stator lamination is entirely composed of the tangent M. Compared with the boot structure in related technologies (such as...), Figure 3 The structure formed by cutting the boot part 3 in the middle A circle), in this embodiment, the boot part 3 structure lacks the cut-off area shown by the dashed line in the figure.

[0040] In another alternative embodiment, along the circumferential direction of the stator lamination, one end of the tangent M extends to the first end of the boot portion 3, and the other end of the tangent M is located between the first end and the second end of the boot portion 3, with the first end and the second end being opposite ends of the boot portion 3.

[0041] like Figure 4 As shown, in this embodiment, one end of the tangent M extends to the first end of the boot portion 3, and the other end of the tangent M is located between the first and second ends of the boot portion 3. At this time, the side of the boot portion 3 facing the center of the stator lamination consists of two arc segments, namely the arc segment N on the left and the arc segment M on the right, as shown. Figure 3 As shown, arc segment M is formed by cutting the boot part 3 with circle B, and arc segment N is formed by cutting the boot part 3 with circle A.

[0042] In a preferred embodiment, the other end of the cut edge M is equidistant from the first end and the second end of the boot part 3.

[0043] Specifically, the rotor 20 of the motor containing the stator laminations rotates from the first end to the second end. Compared to the widely used contralateral trimming, the asymmetrical eccentric trimming in this embodiment, combined with the rotation direction of the motor rotor 20, trims more on the side of the teeth with higher magnetic density and less on the side with lower magnetic density, reducing the concentration of magnetic flux. Since the electromagnetic force is proportional to the square of the magnetic flux density, after trimming to reduce the concentration of magnetic flux in local areas, the electromagnetic force can be effectively reduced, thus achieving the best electromagnetic force reduction effect with the least amount of trimming.

[0044] Specifically, the depth of the cut edge M is less than the thickness of the shoe part 3. The depth of the cut edge M is the radial dimension of the cut edge M along the stator lamination, and the thickness of the shoe part 3 is the radial dimension of the shoe part 3 along the stator lamination. This avoids the cut edge M being cut too deep, which could affect the structural integrity of the shoe part 3 and ensure motor performance.

[0045] In addition, embodiments of this utility model also provide a stator structure, which includes a plurality of stator laminations stacked sequentially, wherein the stator laminations are the stator laminations described above.

[0046] Finally, embodiments of this utility model also provide a motor, such as... Figure 6 The motor shown includes: a stator structure 10, which is the stator structure described above; and a rotor 20, which is rotatably mounted within the stator structure 10.

[0047] Figure 8 This is a comparison diagram of the electromagnetic force density of the motor in this embodiment of the invention and that of a motor in a conventional solution. The electromagnetic force of a motor typically has time and spatial orders. Figure 8In this context, 2fe refers to the time order. Figure 8 In this context, "10th order" and "-2nd order" refer to spatial order. Specifically, the temporal order refers to the excitation frequency of the electromagnetic force, while the spatial order refers to the shape of the electromagnetic force—for example, a spatial order of 2nd order refers to a bilateral shape (ellipse). "2fe" refers to twice the electrical frequency, corresponding to 2*P times the motor's rotational speed, where P is the number of pole pairs. For example, in a 10-pole motor, P = 5. "2fe" refers to 10 times the rotational speed, and the frequency corresponding to 2fe is generally the maximum electromagnetic force frequency of a permanent magnet synchronous motor. Figure 9 This diagram compares the torque ripple of the motor in this embodiment with that in a conventional solution. The eccentric arc-cutting solution significantly reduces torque ripple compared to the conventional solution. Based on simulation results, under the same current, the conventional solution outputs a torque of 448.8 N·mm, while the eccentric arc-cutting solution outputs a torque of 435.5 N·mm, a decrease of 2.96%. 2fe, 10th-order electromagnetic force in space: 154082 N / m 2 2fe, second-order electromagnetic force in space: 33699 N / m 2 When output and efficiency are comparable, the eccentric cutting scheme is better than the conventional symmetrical cutting scheme.

[0048] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0049] The stator lamination of this embodiment includes: a yoke 1, which is an annular structure; multiple stator teeth 2, which are sequentially arranged along an annular trajectory on the yoke 1, with stator slots 4 formed between any two adjacent stator teeth 2 to allow coils 5 to be wound within the stator slots 4; a shoe portion 3 is provided at the end of any stator tooth 2 away from the yoke 1, and a tangent M is provided on the side of the shoe portion 3 facing the center P of the stator lamination, wherein the shape of the tangent M is an arc, and the center Q of the circle containing the tangent M is offset from the center P of the stator lamination. With this structural design, the stator lamination, by providing an eccentric arc tangent on the inner side of the shoe portion 3, makes the distance from various positions on the inner side of the shoe portion 3 to the center P of the stator lamination unequal. When installed in a motor, the distance from the shoe portion 3 to the rotor 20 will exhibit a characteristic of being larger on one side and smaller on the other, thus changing the air gap of the motor. By performing asymmetrical eccentric arc cutting on the stator lamination shoe 3, the characteristics of unidirectional motor operation can be well adapted. By changing the air gap at various positions of the motor through the edge cutting structure, the magnetic flux density on one side of the shoe 3 is reduced, thereby reducing the electromagnetic force at that position. In practical applications, this can reduce the electromagnetic force and torque pulsation generated during motor operation, thereby reducing the noise generated during motor operation and solving the technical problems of excessive vibration and noise during motor operation in related technologies.

[0050] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0051] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0052] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0053] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A stator lamination, characterized in that, include: The yoke (1) is a ring structure; Multiple stator teeth (2) are arranged sequentially along a circular trajectory on the yoke (1), and stator slots (4) are formed between any two adjacent stator teeth (2); Any one of the stator teeth (2) has a boot (3) at one end away from the yoke (1). The boot (3) has a tangent M on one side facing the center P of the stator lamination. The tangent M is arc-shaped, and the center Q of the circle containing the tangent M is offset from the center P of the stator lamination.

2. The stator lamination according to claim 1, characterized in that, For any one of the stator teeth (2), its extension direction is the first direction, and the center Q of the circle where the cutting edge M is located is spaced apart from the center P of the stator lamination along the second direction, which is perpendicular to the first direction.

3. The stator lamination according to claim 2, characterized in that, Along the second direction, the distance between the center Q of the circle containing the tangent M and the center P of the stator lamination is a; along the second direction, the maximum width of the boot (3) is b, where a / b≤1 / 2.

4. The stator lamination according to claim 1, characterized in that, Along the circumference of the stator lamination, one end of the cut edge M extends to the first end of the boot part (3), and the other end of the cut edge M extends to the second end of the boot part (3), the first end and the second end being the two opposite ends of the boot part (3).

5. The stator lamination according to claim 1, characterized in that, Along the circumference of the stator lamination, one end of the cut edge M extends to the first end of the boot part (3), and the other end of the cut edge M is located between the first end and the second end of the boot part (3), the first end and the second end being the opposite ends of the boot part (3).

6. The stator lamination according to claim 5, characterized in that, The other end of the cut edge M is equidistant from the first end and the second end of the boot part (3).

7. The stator lamination according to any one of claims 4 to 6, characterized in that, The rotor (20) of the motor where the stator lamination is located rotates from the first end toward the second end.

8. The stator lamination according to any one of claims 1 to 6, characterized in that, The depth of the cut edge M is less than the thickness of the boot part (3), wherein the depth of the cut edge M is the dimension of the cut edge M along the radial direction of the stator lamination, and the thickness of the boot part (3) is the dimension of the boot part (3) along the radial direction of the stator lamination.

9. A stator structure, characterized in that, The stator structure includes a plurality of stator laminations, which are stacked sequentially, wherein the stator laminations are the stator laminations according to any one of claims 1 to 8.

10. An electric motor, characterized in that, include: Stator structure (10), wherein the stator structure (10) is the stator structure according to claim 9; The rotor (20) is rotatably mounted within the stator structure (10).

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