Stator lamination and compressor

Abstract

The utility model provides a stator punching sheet and compressor, including: annular yoke portion, a plurality of tooth parts, tooth part axial distribution in the inner periphery of annular yoke portion, and radial extension, the first end of tooth part connects the inner periphery of annular yoke portion, and the both sides of second end are equipped with a pair of tooth shoes that protrude outward, the length R1 scope of stator punching sheet inner diameter at tooth part is 25mm <= R1 <= 35mm, the length R2 scope of stator tooth shoe inner diameter at tooth shoe is R1 + 0.5mm <= R2 <= R1 + 3mm, the stator tooth shoe lower cutting edge between stator punching sheet cutting edge and tooth shoe forms the retreat cutting edge, and the stator tooth shoe upper bevel of tooth shoe is parallel with retreat cutting edge. The utility model can pass through the design of big and small stator inner diameter, and the uneven air gap structure design is formed with cooperation rotor, the magnetic circuit of motor operation is better, thereby optimizing motor counter electromotive force waveform and torque ripple.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning equipment, specifically to stator laminations and compressors. Background Technology

[0002] Electric compressors for new energy vehicles typically employ a stator lamination structure of a concentrated-winding permanent magnet synchronous motor. This type of motor offers advantages such as high power density, low noise, wide speed range, and simple manufacturing process. However, issues arising from the inherent structure of concentrated-winding permanent magnet synchronous motors, such as high no-load back EMF harmonic content, high cogging torque, and large torque pulsation, need to be addressed.

[0003] In existing motor structures, auxiliary slots are typically symmetrically cut along the centerline of the stator teeth to improve the back EMF waveform and reduce cogging torque. However, cutting slots directly along the centerline of the stator teeth provides the most direct optimization of the back EMF waveform. But the magnetic circuit of the stator teeth directly affects the magnitude of the electromagnetic torque. This method significantly reduces the motor's electromagnetic torque and back EMF amplitude, leading to a marked decrease in peak torque under overload conditions, an increase in phase current, and negatively impacting motor performance and reducing material utilization.

[0004] Furthermore, traditional concentrated winding motor stator laminations typically employ a uniform air gap design, which can lead to poor sinusoidal back EMF waveform and high harmonic content, resulting in significant torque ripple and cogging torque. Torque ripple and cogging torque are major sources of motor vibration and noise, severely impacting ride comfort, which is particularly critical for new energy vehicles that prioritize quietness. In addition, excessive torque ripple can also adversely affect the operational stability and lifespan of the compressor.

[0005] In view of this, the present invention provides stator laminations and a compressor. Utility Model Content

[0006] To address the problems in the existing technology, the purpose of this utility model is to provide stator laminations and a compressor that overcome the limitations of the existing technology. By designing the inner diameter of the stator with different sizes and cooperating with the rotor to form a non-uniform air gap structure, the magnetic circuit of the motor during operation is optimized, thereby improving the back EMF waveform and torque pulsation of the motor.

[0007] An embodiment of this utility model provides a stator lamination, comprising:

[0008] Annular yoke;

[0009] The device has several teeth, which are axially evenly distributed on the inner circumference of the annular yoke and extend radially. The first end of each tooth is connected to the inner circumference of the annular yoke, and the second end has a pair of outwardly protruding toothed shoes on both sides. The length R1 of the inner diameter of the stator lamination at the tooth is in the range of 25mm≤R1≤35mm, and the length R2 of the inner diameter of the stator toothed shoe at the toothed shoe is in the range of R1+0.5mm≤R2≤R1+3mm. A stepped-down cut edge is formed between the cut edge of the stator lamination and the lower cut edge of the stator toothed shoe. The upper inclined edge of the stator toothed shoe is parallel to the stepped-down cut edge.

[0010] Preferably, the stator lamination cut edge and the stator tooth shoe cut edge form steps with different inner diameters. The stator inner diameter decreases closer to the central axis of the tooth and increases closer to the tooth shoe.

[0011] Preferably, the central axis of the tooth coincides with the radial direction, and the tooth edge is parallel to the central axis of the tooth.

[0012] Preferably, an angle A1 is formed between the step-off edge and the tooth edge of the tooth, and the value of the angle A1 is in the range of 100°≤A1≤140°.

[0013] Preferably, an angle A2 is formed between the inclined side of the stator toothed shoe and the tooth edge of the tooth, and the value of the angle A2 is in the range of 100°≤A2≤140°.

[0014] Preferably, half of the width of the tooth is L1, L1 = R1 / P*k, where P is the number of motor poles, and the value of P is one of 4, 6, 8, or 10, and k is a coefficient, 0.8 ≤ k ≤ 1.2.

[0015] Preferably, the toothed boot is axially symmetrical about the central axis of the teeth.

[0016] Preferably, the toothed boot is trapezoidal.

[0017] Preferably, stator slots for accommodating windings are formed between adjacent teeth.

[0018] An embodiment of this utility model also provides a compressor, including stator laminations as described above.

[0019] The stator laminations and compressor of this invention can optimize the magnetic circuit during motor operation by designing the stator inner diameter of different sizes and combining it with the rotor to form a non-uniform air gap structure, thereby optimizing the back EMF waveform and torque pulsation of the motor. Attached Figure Description

[0020] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the stator lamination of this utility model.

[0022] Figure 2 for Figure 1 A magnified view of region A in the middle.

[0023] Figure 3 The image shows the potential waveform of the stator lamination of this invention in the first comparative test experiment.

[0024] Figure 4 The waveform diagram of the potential of the stator lamination in the first comparative test experiment is shown.

[0025] Figure 5 The waveform diagram of the potential of the stator lamination of this invention is shown in the second comparative test experiment.

[0026] Figure 6 The potential waveform of the stator lamination in the prior art is shown in the second comparative test experiment.

[0027] Figure 7 The waveform diagram of the potential of the stator lamination of this utility model in the third comparative test experiment.

[0028] Figure 8 The potential waveform of the stator lamination in the third comparative test experiment is shown.

[0029] Figure Labels

[0030] 1. Film processing

[0031] 2 yoke

[0032] 3. Teeth

[0033] 4. Toothed boots

[0034] 5. Stator lamination trimming

[0035] 6. Trim the edges of the table.

[0036] 7 Lower trimming of stator tooth shoe

[0037] 8 toothed edges

[0038] 9. Upper bevel of the stator toothed shoe

[0039] R1 Stator lamination inner diameter

[0040] R2 Stator gear inner diameter

[0041] A1 First included angle

[0042] A2 Second included angle Detailed Implementation

[0043] The following specific examples illustrate the implementation methods of this application. Those skilled in the art can easily understand the other advantages and effects of this application from the content disclosed herein. This application can also be implemented or applied through other different specific embodiments, and various details in this application can be modified or changed according to different viewpoints and application systems without departing from the spirit of this application. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0044] The embodiments of this application will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily implement the application. This application may be embodied in many different forms and is not limited to the embodiments described herein.

[0045] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics represented in connection with that embodiment or example, which are included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics represented may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate different embodiments or examples represented in this application, as well as features of different embodiments or examples.

[0046] Furthermore, the terms "first" and "second" are used for illustrative purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the representation of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0047] To clearly illustrate this application, devices unrelated to the description are omitted, and the same or similar constituent elements throughout the specification are given the same reference numerals.

[0048] Throughout this specification, when it is said that a device is "connected" to another device, this includes not only "direct connection" but also "indirect connection" by placing other components in between. Furthermore, when it is said that a device "comprises" a certain constituent element, unless otherwise stated otherwise, this does not exclude other constituent elements, but rather implies that other constituent elements may be included.

[0049] When we say that a device is "above" another device, this can mean that it is directly above the other device, or it can mean that other devices are present in between. Conversely, when we say that a device is "directly" "above" another device, there are no other devices present in between.

[0050] Although the terms first, second, etc., are used in some instances herein to refer to various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, first interface and second interface, etc., are used. Furthermore, as used herein, the singular forms “a,” “an,” and “the” are intended to also include the plural forms unless the context indicates otherwise. It should be further understood that the terms “comprising,” “including,” indicate the presence of features, steps, operations, elements, components, items, kinds, and / or groups, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms “or” and “and / or” as used herein are interpreted as inclusive, or mean any one or any combination thereof. Thus, “A, B, or C” or “A, B, and / or C” means “any one of: A; B; C; A and B; A and C; B and C; A, B, and C.” Exceptions to this definition will only occur if the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0051] The technical terms used herein are for reference only to specific embodiments and are not intended to limit the scope of this application. The singular form used herein includes the plural form unless the statement explicitly indicates otherwise. The word "comprising" as used in the specification means to specify a particular characteristic, region, integer, step, operation, element, and / or component, and does not exclude the presence or addition of other characteristics, regions, integers, steps, operations, elements, and / or components.

[0052] Although not explicitly defined, all terms, including technical and scientific terms used herein, shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. Terms defined in commonly used dictionaries shall be further interpreted as having a meaning consistent with the relevant technical literature and the content of this present application, and shall not be over-interpreted as having an ideal or overly formulaic meaning unless otherwise defined.

[0053] Figure 1 This is a schematic diagram of the stator lamination of this utility model. Figure 2 for Figure 1 A magnified view of region A in the middle. (See image below.) Figure 1 and 2As shown, the stator lamination 1 of this utility model includes: an annular yoke 2 and a plurality of teeth 3. The teeth 3 are axially evenly distributed on the inner circumference of the annular yoke 2 and extend radially. The first end of each tooth 3 is connected to the inner circumference of the annular yoke 2, and the second end has a pair of outwardly protruding toothed shoes 4 on both sides. The length R1 of the inner diameter of the stator lamination at the teeth 3 is in the range of 25mm≤R1≤35mm, and the length R2 of the inner diameter of the stator toothed shoes at the toothed shoes 4 is in the range of R1+0.5mm≤R2≤R1+3mm. A stepped-down cut edge 6 is formed between the stator lamination cut edge 5 and the lower cut edge 7 of the stator toothed shoes 4, and the upper inclined edge 9 of the stator toothed shoes 4 is parallel to the stepped-down cut edge 6. This invention designs different inner diameters for the teeth of the centralized stator laminations. The stator inner diameter is smaller near the center line of the teeth and larger near the tooth shoe. This design of varying stator inner diameters, combined with the rotor to form a non-uniform air gap structure, optimizes the spatial harmonics of the air gap magnetic field, thereby improving the back EMF waveform and resulting in a better magnetic circuit during motor operation. This design concept optimizes the motor's back EMF waveform and torque pulsation.

[0054] In a preferred embodiment, the stator lamination cut edge 5 and the stator tooth shoe lower cut edge 7 form steps with different inner diameters. The stator inner diameter decreases closer to the central axis of the tooth 3 and increases closer to the tooth shoe 4, but this is not a limitation.

[0055] In a preferred embodiment, the central axis of the tooth 3 coincides with the radial direction, and the tooth edge 8 is parallel to the central axis of the tooth 3, but this is not a limitation.

[0056] In a preferred embodiment, an angle A1 is formed between the step-off edge 6 and the tooth edge 8 of the tooth portion 3. The value of the angle A1 is in the range of 100°≤A1≤140°, but is not limited thereto.

[0057] In a preferred embodiment, A1 is one of 105°, 110°, 115°, 120°, 125°, 130°, and 135°, but is not limited thereto.

[0058] In a preferred embodiment, the inclined side 9 of the stator tooth shoe 4 and the tooth edge 8 of the tooth 3 form an included angle A2, the value of which is 100°≤A2≤140°, but is not limited thereto.

[0059] In a preferred embodiment, A2 is one of 105°, 110°, 115°, 120°, 125°, 130°, and 135°, but is not limited thereto.

[0060] In a preferred embodiment, half the width of the tooth 3 is L1, L1 = R1 / P*k, where P is the number of motor poles and the value of P is one of 4, 6, 8, or 10, and k is a coefficient, 0.8 ≤ k ≤ 1.2, but not limited thereto.

[0061] In a preferred embodiment, the toothed boots 4 on both sides of the toothed portion 3 are axially symmetrical about the central axis of the toothed portion 3, but this is not a limitation.

[0062] In a preferred embodiment, the overall shape of the toothed boot 4 is a trapezoidal pattern, but it is not limited thereto.

[0063] In a preferred embodiment, the length of the upper inclined side 9 of the stator tooth shoe is greater than the length of the lower tangent side 7 of the stator tooth shoe, but is not limited thereto.

[0064] In a preferred embodiment, stator slots for accommodating windings are formed between adjacent teeth 3, but this is not a limitation.

[0065] This utility model relates to a stator lamination structure for a centralized winding permanent magnet synchronous motor used in electric compressors for new energy vehicles. This stator lamination, by employing different inner diameters in its tooth and tooth shoe sections, forms a non-uniform air gap structure, thereby optimizing the motor's magnetic circuit, improving the back EMF waveform, reducing torque pulsation and cogging torque, and enhancing the motor's NVH (noise, vibration, and harshness) performance. Simultaneously, it maintains virtually no loss in electromagnetic torque and back EMF amplitude, ensuring the motor's overload capacity. This paper details the structural features, design parameters, preferred embodiments, and performance advantages verified through comparative testing experiments of this stator lamination.

[0066] The specific embodiments of this utility model are as follows:

[0067] like Figure 1 , 2 The diagram shows an overall schematic of the stator lamination 1 of this invention. The stator lamination 1 mainly consists of two parts: an annular yoke 2 and multiple teeth 3. The annular yoke 2, serving as the main magnetic conductive part and structural support of the stator magnetic circuit, is annular in shape. Several teeth 3 are evenly distributed (axially evenly distributed) along the inner circumference of the annular yoke 2 and extend radially inward. The first end (root) of each tooth 3 is connected to the inner circumference of the annular yoke 2, and a pair of outwardly protruding toothed shoes 4 are provided on both sides of its second end (end). Two adjacent teeth 3 and the inner circumferential region of the annular yoke 2 between them together constitute the stator slot for accommodating the motor windings. The core improvement of this invention lies in the stator inner diameter design of the toothed shoe 3 and toothed shoe 4 regions, forming a stepped or discontinuous inner circular profile to achieve a non-uniform air gap when mating with the rotor.

[0068] Among these, the key dimensions R1 and R2 are as follows: The inner diameter of the stator lamination in tooth region 3 is R1. Its design range is limited to 25 mm to 35 mm (25 mm ≤ R1 ≤ 35 mm). This dimension directly affects the magnetic circuit cross-sectional area and magnetic flux density of the tooth. The inner diameter of the stator tooth shoe in tooth shoe region 4 is R2. The design of R2 is based on R1, and its range is R1 + 0.5 mm to R1 + 3 mm (R1 + 0.5 mm ≤ R2 ≤ R1 + 3 mm). This means that the inner diameter of the tooth shoe section is always larger than the inner diameter of the central tooth region.

[0069] The formation of the stepped structure in this utility model: (Reference) Figure 2 The overall inner circle of the stator lamination is not a complete circle. On both sides of tooth 3, there is a contour section called the "stator lamination tangent edge 5". At the bottom of tooth shoe 4, there is a "stator tooth shoe lower tangent edge 7". The stator lamination tangent edge 5 and the stator tooth shoe lower tangent edge 7 are connected by a "stepped tangent edge 6". It is this stepped tangent edge 6, together with the tooth shoe lower tangent edge 7 and the lamination tangent edge 5, that forms a stepped structure, making the inner diameter (defined by R1) smaller near the center axis of tooth 3, and larger near the tooth shoe 4 (defined by R2). The essence of this design is: near the center line of the tooth, the stator inner diameter is small, and the air gap length is relatively large; near the edge of the tooth shoe, the stator inner diameter is large, and the air gap length is relatively small. This carefully designed variation in air gap length can change the distribution of air gap magnetic permeability, weaken specific magnetic field harmonics, thereby optimizing the magnetic circuit during motor operation, ultimately achieving the purpose of optimizing the back EMF waveform, reducing torque pulsation and cogging torque.

[0070] Furthermore, this invention employs a parallel edge design: the stator tooth shoe 4 has an "upper inclined edge 9". This invention requires that the upper inclined edge 9 of the stator tooth shoe be parallel to the aforementioned stepped-back tangent edge 6. This parallel relationship helps maintain the regularity of magnetic circuit changes and simplifies the manufacturing process.

[0071] Furthermore, the central axis of the tooth 3 in this invention coincides with the radial direction of the stator. The two sides of the tooth 3, namely the "tooth edges 8", are designed to be parallel to the central axis. This symmetrical and parallel tooth structure is beneficial for winding embedding and symmetrical distribution of the magnetic field. The angle between the step-off edge 6 and the tooth edge 8 of the tooth 3 is defined as A1. The value range of this angle A1 is optimized to be between 100° and 140° (100°≤A1≤140°). The angle between the stator tooth shoe upper inclined edge 9 of the tooth shoe 4 and the tooth edge 8 of the tooth 3 is defined as A2. The value range of this angle A2 is also optimized to be between 100° and 140° (100°≤A2≤140°). The selection of angles A1 and A2 directly affects the transition shape of the step and the opening angle of the tooth shoe, which is crucial to the magnetic field modulation effect.

[0072] Regarding tooth width: L1 is defined as half the width of tooth 3 (usually referring to the narrowest point or a specified position). The value of L1 is related to the number of poles of the motor, and its calculation formula is: L1 = R1 / P*k. Where P is the number of poles of the motor, which can be 4, 6, 8, or 10. This is based on the pole-slot combination commonly used in concentrated winding motors. k is a coefficient with a value ranging from 0.8 to 1.2. This coefficient provides design flexibility, allowing for fine-tuning of the tooth width according to specific electromagnetic performance requirements.

[0073] Regarding symmetry and shape: Preferably, the toothed shoes 4 on both sides of the tooth 3 are axially symmetrically distributed based on the central axis of the tooth 3. This ensures the symmetry of the magnetic circuit and avoids generating unnecessary unilateral magnetic pull. The shape of the toothed shoes 4 can be designed as a trapezoidal shape, which helps to guide the magnetic flux and form the required magnetic field distribution. However, this invention is not limited to this specific shape, and other shapes that can achieve similar functions are also within the scope of protection.

[0074] Comparative testing and performance verification: To quantify the performance improvement brought about by this invention, three sets of detailed comparative testing experiments were conducted, comparing the motor using the stator laminations of this invention with the motor using traditional uniform inner diameter stator laminations:

[0075] First comparative test experiment: Back potential waveform optimization

[0076] Test conditions: Motor for a 5HP (horsepower) compressor.

[0077] The parameters of this utility model are: L1 = 4 (mm), A1 = 115°, A2 = 115°, R1 = 30mm, R2 = 31mm.

[0078] Comparison object: Traditional uniform inner diameter stator lamination (without step protection).

[0079] Results and Analysis:

[0080] like Figure 3 and Figure 4 As shown, the back electromotive force waveform generated by the stator lamination of this invention ( Figure 3 The waveform is significantly better than that of traditional lamination. Figure 4 It is closer to a sine wave.

[0081] The data comparison is as follows:

[0082] RMS value of back electromotive force U phase Vrms 22.8974 22.9693 Back EMF harmonic distortion rate (1000 rpm no load) 2％ 10％

[0083] Conclusion: Under the experimental parameters, this invention can significantly reduce the harmonic distortion rate (THD) of the back EMF from 10% to 2%, a reduction of 8%, greatly improving the sinusoidal nature of the waveform. Simultaneously, the effective value of the back EMF only decreases by about 0.3%, a negligible loss, ensuring that the motor's output capacity is essentially unaffected. The reduction in harmonic distortion rate directly contributes to reducing torque ripple and electromagnetic noise.

[0084] Second comparative test experiment: Cogging torque reduction

[0085] Test conditions: The motors used in the same 5HP compressor are all from the same unit.

[0086] The parameters of this utility model are: L1 = 4.5mm, A1 = 120°, A2 = 120°, R1 = 31mm, R2 = 31.5mm.

[0087] Comparison object: Traditional uniform inner diameter stator lamination.

[0088] Results and Analysis:

[0089] Cogging torque is the periodic torque generated when the motor is not powered on due to the interaction between the permanent magnet and the stator core slots. Figure 5 and Figure 6 The comparison shows that the peak cogging torque of the motor of this invention is significantly lower than that of the traditional motor.

[0090] The data comparison is as follows:

[0091] Cogging torque 0.215Nm 0.335Nm

[0092] Conclusion: Under the experimental parameters, this invention successfully reduced the cogging torque by approximately 35.8% (from 0.335 Nm to 0.215 Nm). This significant reduction in cogging torque means a smoother motor startup and low-speed operation, contributing to reduced vibration and noise, and improved NVH performance.

[0093] Third comparative test experiment: Improvement of torque ripple

[0094] Test conditions: The same applies to the motor used in the 5HP compressor.

[0095] The parameters of this utility model are: L1 = 5mm, A1 = 125°, A2 = 125°, R1 = 31mm, R2 = 32mm.

[0096] Comparison object: Traditional uniform inner diameter stator lamination.

[0097] Results and Analysis:

[0098] Torque pulsation is the fluctuation component of torque when a motor is running under load. Figure 7 and Figure 8The torque waveform comparison shows that the motor torque curve using the lamination of this invention is smoother.

[0099] The data comparison is as follows:

[0100] Average torque Nm 4.9763 4.9883 Torque pulsation 15％ 20％

[0101] Conclusion: Under the experimental parameters, this invention reduces torque ripple from 20% to 15% while maintaining almost no change in the average torque (loss less than 0.25%), a reduction of 5%. Lower torque ripple means smoother motor operation, less vibration and noise, which is crucial for the comfort of the vehicle-mounted electric compressor.

[0102] This invention utilizes an innovative stator lamination structure design, cleverly employing a stepped structure formed by different inner diameters to achieve a non-uniform air gap fit with the rotor. This design brings the following significant advantages:

[0103] Significantly optimized electromagnetic performance: effectively improved the sinusoidal nature of the back EMF waveform and greatly reduced the harmonic distortion rate; at the same time, significantly reduced the cogging torque and torque pulsation during operation.

[0104] High performance and high efficiency coexist: While achieving the above optimizations, the back EMF amplitude and average output torque of the motor are hardly sacrificed, ensuring the power density and overload capacity of the motor.

[0105] Improving NVH levels: The reduction in torque pulsation and cogging torque directly translates into lower vibration and noise, meeting the high requirements of new energy vehicles for quietness.

[0106] Highly applicable and flexible: By adjusting parameters such as R1, R2, A1, A2, and L1, it is possible to optimize the design for motors with different pole numbers and power levels, thus having good engineering applicability.

[0107] This invention is particularly applicable to the field of electric compressors for new energy vehicles, where stringent requirements for vibration and noise are placed, and provides an effective technical solution for improving the overall quality of the vehicle.

[0108] This invention also provides a compressor, including the aforementioned stator laminations. The stator lamination structure of this invention is used in electric compressors for new energy vehicles, specifically in a concentrated winding permanent magnet synchronous motor. This invention employs a non-uniform inner diameter design for the stator teeth to create a non-uniform air gap and change the air gap magnetic reluctance, thereby optimizing the air gap magnetic field distribution of the motor. This makes the no-load back EMF tend to be sinusoidal, thus reducing cogging torque and ultimately reducing electromagnetic noise and torque fluctuations during motor operation. Therefore, this design is essential for concentrated winding permanent magnet synchronous motors in terms of motor noise and operational stability. This invention can improve the back EMF waveform of the motor, reduce motor torque pulsation and cogging torque, and optimize the motor's NVH level. It achieves almost no loss in motor electromagnetic torque and back EMF amplitude, ensuring the motor's overload capacity.

[0109] In summary, the purpose of this utility model is to provide stator laminations that, through the design of stator inner diameters of different sizes, can form a non-uniform air gap structure with the rotor, thereby optimizing the magnetic circuit during motor operation and thus improving the back EMF waveform and torque pulsation of the motor.

[0110] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A stator lamination, characterized in that, include: Annular yoke (2); Several teeth (3) are axially evenly distributed on the inner circumference of the annular yoke (2) and extend radially. The first end of each tooth (3) is connected to the inner circumference of the annular yoke (2), and the second end has a pair of outwardly protruding toothed shoes (4) on both sides. The length R1 of the stator lamination inner diameter at the tooth (3) is 25mm≤R1≤35mm, and the length R2 of the stator toothed shoe inner diameter at the toothed shoe (4) is R1+0.5mm≤R2≤R1+3mm. The stator lamination cut edge (5) and the stator toothed shoe (4) are connected to the stator lamination. A stepped-down edge (6) is formed between the lower cut edges (7) of the toothed shoe, and the upper inclined edge (9) of the stator toothed shoe (4) is parallel to the stepped-down edge (6).

2. The stator lamination as described in claim 1, characterized in that, The stator lamination cut edge (5) and the stator tooth shoe cut edge (7) form steps with different inner diameters. The stator inner diameter decreases as it gets closer to the central axis of the tooth (3), and increases as it gets closer to the tooth shoe (4).

3. The stator lamination as described in claim 1, characterized in that, The central axis of the tooth (3) coincides with the radial direction, and the tooth edge (8) of the tooth (3) is parallel to the central axis of the tooth (3).

4. The stator lamination as described in claim 1, characterized in that, An angle (A1) is formed between the stepped edge (6) and the tooth edge (8) of the tooth (3), and the value range of the angle (A1) is 100°≤A1≤140°.

5. The stator lamination as described in claim 1, characterized in that, An angle (A2) is formed between the upper inclined side (9) of the stator tooth shoe (4) and the tooth edge (8) of the tooth part (3), and the value range of the angle (A2) is 100°≤A2≤140°.

6. The stator lamination as described in claim 1, characterized in that, The width of the tooth (3) is half of L1, where L1 = R1 / P k and P are the number of poles of the motor. The value of P is one of 4, 6, 8, or 10. k is a coefficient, where 0.8 ≤ k ≤ 1.

2.

7. The stator lamination as described in claim 1, characterized in that, The toothed boot (4) is axially symmetrical about the central axis of the tooth (3).

8. The stator lamination as described in claim 1, characterized in that, The toothed boot (4) is trapezoidal.

9. The stator lamination as described in claim 1, characterized in that, Stator slots for accommodating windings are formed between adjacent teeth (3).

10. A compressor, characterized in that, Including the stator lamination as described in claim 1.

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