Stator core, motor and vehicle

Abstract

The invention discloses a stator core motor and a vehicle, and relates to the technical field of motor equipment, the stator core comprises a yoke part, tooth parts and tooth boots arranged on the sides, away from the yoke part, of the tooth parts, the tooth parts are evenly distributed in the circumferential direction of the yoke part, and the tooth boots are arranged on the sides, away from the yoke part, of the tooth parts. Auxiliary grooves extending in the axial direction of the stator iron core are formed in the inner circumferential walls of at least part of the tooth boots, and at least one parameter of the auxiliary grooves changes in the axial direction. According to the stator core provided by the embodiment of the invention, the at least one parameter of the auxiliary slot is set to be in the form of changing along the axial direction, so that broadband and cooperative suppression of multi-order harmonics of an air-gap magnetic field can be realized, and electromagnetic vibration and noise of a motor in a whole working interval can be reduced.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment technology, and in particular to a stator core, an electric motor having the stator core, and a vehicle having the stator core or the electric motor. Background Technology

[0002] Auxiliary slots are created in the stator gear shoe section of the motor to suppress air gap magnetic field harmonics through magnetoresistive modulation, thereby suppressing electromagnetic vibration and noise. Currently, the process has evolved from simple gear shoe slotting (rectangular, V-shaped, etc.) to optimization using the number and position of circumferential and axial slots.

[0003] In related technologies, there is a problem of mismatch between static modulation schemes and dynamically changing magnetic fields, making it difficult to adapt to the operating requirements of a wide speed range. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, one object of this invention is to provide a stator core that, by setting at least one parameter of the auxiliary slot to vary along the axial direction, can achieve wideband, synergistic suppression of multi-order harmonics of the air gap magnetic field, thereby reducing electromagnetic vibration and noise of the motor throughout its operating range.

[0005] Another object of the present invention is to provide an electric motor comprising the aforementioned stator core.

[0006] Another object of the present invention is to provide a vehicle comprising the aforementioned stator core or the aforementioned motor.

[0007] According to an embodiment of the present invention, a stator core includes: a yoke, teeth, and toothed shoes disposed on the side of the teeth away from the yoke. The teeth are uniformly distributed circumferentially along the yoke. At least a portion of the inner peripheral wall of the toothed shoes is provided with an auxiliary groove extending axially along the stator core. At least one parameter of the auxiliary groove varies axially.

[0008] According to the stator core of the present invention, by setting at least one parameter of the auxiliary slot to vary along the axial direction, a wide-bandwidth, synergistic suppression of multi-order harmonics of the air gap magnetic field can be achieved, thereby reducing electromagnetic vibration and noise of the motor throughout the entire operating range.

[0009] In addition, the stator core according to the above embodiments of the present invention may also have the following additional technical features: In some embodiments of the present invention, at least one parameter of the auxiliary groove varies continuously along the axial direction.

[0010] In some embodiments of the invention, at least one inner wall of the auxiliary groove extends along a curve.

[0011] In some embodiments of the invention, at least one parameter of the auxiliary groove varies in segments along the axial direction.

[0012] In some embodiments of the present invention, the stator core includes a plurality of stator laminations stacked along the axial direction, each stator lamination having a sub-auxiliary slot, the plurality of sub-auxiliary slots being connected along the axial direction to form at least three segments, adjacent segments being connected along the axial direction to form the auxiliary slot, and the parameters of the plurality of segments being different.

[0013] In some embodiments of the present invention, the plurality of segments include a first segment, a second segment, a third segment, a fourth segment, and a fifth segment connected sequentially along the axial direction, wherein the first segment, the second segment, the third segment, the fourth segment, and the fifth segment have different depths along the radial direction of the stator core.

[0014] In some embodiments of the present invention, in the axial direction, the depth dimension of the plurality of sub-auxiliary grooves gradually increases or decreases from one end to the other.

[0015] In some embodiments of the present invention, in the axial direction, a plurality of the sub-auxiliary grooves are constructed in multiple stages from one end to the other, and the depth dimensions of the sub-auxiliary grooves located in the stages are different.

[0016] In some embodiments of the present invention, the parameters of the auxiliary groove include one or more combinations of the depth, width, shape, and number of the auxiliary groove.

[0017] In some embodiments of the present invention, the variation of at least one parameter of the auxiliary slot along the axial direction is related to the axial harmonic distribution characteristics of the motor air gap magnetic field.

[0018] In some embodiments of the present invention, at least one parameter of the auxiliary groove is configured to vary along the axial direction to produce a synergistic suppression effect on radial electromagnetic force waves of different orders.

[0019] The motor according to an embodiment of the present invention includes the aforementioned stator core.

[0020] According to embodiments of the present invention, by applying the aforementioned stator core, the electromagnetic vibration and noise of the motor are reduced throughout its operating range.

[0021] The vehicle according to an embodiment of the present invention includes the aforementioned stator core or the aforementioned motor.

[0022] According to embodiments of the present invention, the stability of vehicle operation can be improved by applying the aforementioned stator core or motor. Attached Figure Description

[0023] Figure 1 These are schematic diagrams of the stator core structure in some embodiments of the present invention; Figure 2 These are partial structural cross-sectional views of the stator core in some embodiments of the present invention; Figure 3 These are schematic diagrams of the stator core structure in other embodiments of the present invention; Figure 4 These are partial structural cross-sectional views of the stator core in other embodiments of the present invention; Figure 5 This is a schematic diagram of the stator core structure in some embodiments of the present invention; Figure 6 This is a partial enlarged view of the stator core structure in some embodiments of the present invention; Figure 7 This is a partial enlarged view of the stator core structure in some embodiments of the present invention.

[0024] Figure label: 1. Stator core; 2. Yoke; 3. Gear shoe; 4. Auxiliary slot; 41. First section; 42. Second section; 43. Third section; 44. Fourth section. Detailed Implementation

[0025] Auxiliary slots are created in the stator gear shoe section of the motor to suppress air gap magnetic field harmonics through magnetoresistive modulation, thereby suppressing electromagnetic vibration and noise. Currently, the process has evolved from simple gear shoe slotting (rectangular, V-shaped, etc.) to optimization using the number and position of circumferential and axial slots.

[0026] In related technologies, the auxiliary slots of the motor stator gear shoe have the following problems: Narrow suppression bandwidth: Fixed slot shape and limited axial segmentation can only achieve the best suppression effect for electromagnetic force waves of a limited order under specific working conditions, and it is difficult to adapt to the operating requirements of a wide speed range.

[0027] Physical field mismatch: Due to the end effect, the air gap magnetic field exhibits non-uniformity along the axial direction. Discrete modulation methods are difficult to match this continuously changing field characteristic.

[0028] Single optimization dimension: Existing solutions lack the ability to synergistically suppress multi-order force waves. Optimizing a single objective may worsen the performance of other orders. For example, optimizing the slot shape used to suppress the 11th harmonic may have little effect on the 13th harmonic or even have a negative impact.

[0029] Therefore, this application aims to solve the problem of "mismatch between static modulation scheme and dynamically changing magnetic field" in related technologies. It provides a stator structure and design method that can adapt to the axial magnetic field distribution characteristics, thereby achieving stable and efficient harmonic suppression over a wide frequency range. According to the stator core of the present invention, global performance optimization can be achieved. Through axial gradient magnetoresistive modulation, wide-bandwidth, synergistic suppression of multi-order harmonics of the air gap magnetic field is achieved, reducing electromagnetic vibration and noise of the motor throughout its operating range; improving physical field adaptability; specifically, addressing the non-uniform axial distribution of the air gap magnetic field caused by end effects, the axial variation of auxiliary slot parameters is matched with the harmonic characteristics of the magnetic field, achieving precise suppression "tailored to local conditions".

[0030] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0031] Combination Figures 1 to 7 According to an embodiment of the present invention, the stator core 1 includes: a yoke 2, teeth, and toothed shoes 3 disposed on the side of the teeth away from the yoke 2. The teeth are evenly distributed circumferentially along the yoke 2. At least a portion of the inner peripheral wall of the toothed shoes 3 is provided with auxiliary grooves 4 extending axially along the stator core 1. At least one parameter of the auxiliary grooves varies axially. Alternatively, the shape of the auxiliary grooves 4 is irregularly arranged axially.

[0032] Specifically, the stator gear shoe 3 auxiliary groove 4 extends axially, which can extend from one end of the stator core 1 to the other end. This can increase the axial extension dimension and adapt to the operating requirements of a wide speed range.

[0033] Furthermore, due to the end effect, the air gap magnetic field exhibits non-uniformity along the axial direction. Discrete modulation methods are difficult to match this continuously changing field characteristic. By setting the shape of the auxiliary slot 4 to vary along the axial direction of the stator core 1, an irregular arrangement along the axial direction can be formed, which facilitates the variation in harmonic characteristics of the magnetic field in different axial regions, thereby forming an axial gradient magnetoresistive modulation structure.

[0034] The specific arrangement of the auxiliary slot 4 along the axial direction can be set according to the axial distribution characteristics of the magnetic field and the variation law of the slot parameters. In this way, differentiated magnetoresistive modulation units can be designed for the dominant harmonic characteristics of different regions along the axial direction, thereby achieving optimal global performance.

[0035] According to an embodiment of the present invention, the stator core 1 achieves wide-band, synergistic suppression of multi-order harmonics of the air gap magnetic field by setting at least one parameter of the auxiliary slot 4 to vary along the axial direction, thereby reducing electromagnetic vibration and noise of the motor throughout the entire operating range.

[0036] In some embodiments of the present invention, the parameters of the auxiliary slot 4 vary continuously along the axial direction. Specifically, among the structural parameters of the auxiliary slot 4, at least one structural parameter (e.g., slot depth H) varies continuously along the axial direction of the stator core 1, in relation to the harmonic characteristics of the magnetic field in different axial regions, thereby forming a stator core structure based on axial gradient magnetoresistive modulation.

[0037] For example, combined Figure 1 and Figure 2 In some embodiments of the present invention, at least one inner wall of the auxiliary groove 4 extends along a curve. Parametric gradient modulation can be achieved, with the depth of the auxiliary groove 4 continuously varying according to a function H(z) related to the axial position z, which is determined based on the axial distribution characteristics of the air gap magnetic field harmonics of the target motor under no-load or load conditions. Differentiated magnetoresistive modulation units are designed for the dominant harmonic characteristics in different axial regions, thereby achieving optimal global performance.

[0038] Combination Figure 2 In the axial direction, the curve can be a wavy extension, with different depths of the auxiliary groove 4 at positions with varying curvature. This creates an uneven structure on the inner wall of the auxiliary groove 4, where the depth of the recesses is greater than the depth of the convex parts.

[0039] Specifically, the stator core 1 includes multiple stator laminations stacked axially. The auxiliary groove 4 can be formed by stacking multiple stator laminations axially, that is, each stator lamination has a sub-auxiliary groove, and the multiple sub-auxiliary grooves are connected to form the auxiliary groove 4 extending axially after stacking multiple stator laminations. Alternatively, the auxiliary groove 4 extending axially can be formed by cutting or other methods after stacking multiple stator laminations. Especially when at least one parameter of the auxiliary groove 4 changes continuously along the axial direction, in order to improve the continuity of parameter changes, the auxiliary groove 4 can be constructed after stacking multiple stator laminations, thereby improving the dimensional accuracy of the auxiliary groove 4 and facilitating manufacturing and assembly.

[0040] In some embodiments of the present invention, at least one parameter of the auxiliary slot 4 varies segmentally along the axial direction. Specifically, among the structural parameters of the auxiliary slot 4, at least one structural parameter (e.g., slot depth H) undergoes a segmented change along the axial direction of the stator core 1, which is associated with the harmonic characteristics of the magnetic field in different axial regions, thereby forming an axial gradient magnetoresistive modulation structure.

[0041] Combination Figure 3In some embodiments of the present invention, the stator core 1 includes a plurality of stator laminations stacked along the axial direction, each stator lamination having a sub-auxiliary slot, the plurality of sub-auxiliary slots being connected along the axial direction to form at least three segments, adjacent segments being connected along the axial direction to form auxiliary slots 4, the parameters of the plurality of segments being different.

[0042] In some embodiments of the invention, the parameters of the multiple segmented auxiliary slots 4 include the depth along the radial direction of the stator core 1.

[0043] Specifically, the auxiliary slot 4 can also be constructed in the form of segmented gradient modulation, dividing the stator core 1 axially into N segments (N≥3). Based on the magnetic field harmonic characteristics of each segment's axial region, different auxiliary slot 4 parameters (such as depth H) are customized for each segment. In axial segments with uniform magnetic field distribution, slot type parameters optimized for different orders of force waves can be set in different axial segments. For example, the first segment 41 slot type is optimized for suppressing m-order radial electromagnetic force waves, and the second segment 42 slot type is optimized for suppressing n-order radial electromagnetic force waves. The local optimization effects of each segment are superimposed to achieve synergistic suppression of broadband harmonics globally.

[0044] More specifically, combined Figure 3 In some embodiments of the present invention, the multiple segments include a first segment 41, a second segment 42, a third segment 43, a fourth segment 44, and a fifth segment connected sequentially along the axial direction. The depths of the first segment 41, the second segment 42, the third segment 43, the fourth segment 44, and the fifth segment along the radial direction of the stator core 1 are all different. Figure 3 The depth of the first segment 41 is less than that of the second segment 42, the depth of the second segment 42 is greater than that of the third segment 43, and the depth of the third segment 43 is greater than that of the fourth segment 44. As a result, the inner wall of the auxiliary groove 4 forms an irregular shape along the axial direction. Specifically, the specific depth dimensions of each segment can be reasonably set according to the axial distribution characteristics of the magnetic field and the variation law of the groove parameters, thereby achieving coordinated suppression of broadband harmonics globally.

[0045] In some embodiments of the present invention, in the axial direction, the depth dimension of a plurality of sub-auxiliary grooves gradually increases or decreases from one end to the other.

[0046] In some embodiments of the present invention, in the axial direction, a plurality of sub-auxiliary grooves form a plurality of stages from one end to the other, and the sub-auxiliary grooves located in the stages have different depth dimensions.

[0047] In some embodiments of the present invention, the parameters of the auxiliary groove 4 include one or more combinations of the depth, width, shape and number of the auxiliary groove 4, which can improve the flexibility of the arrangement and facilitate the reasonable setting based on the axial distribution characteristics of the magnetic field and the determination of the variation law of the groove parameters.

[0048] In some embodiments of the present invention, the auxiliary groove 4 can be in various shapes (rectangular, arc-shaped, V-shaped, etc.); at least one toothed shoe 3 is slotted in the circumferential direction; the slotted toothed shoe 3 has at least one groove; multiple auxiliary grooves 4 of different shapes can be combined.

[0049] For example, such as Figure 5 The auxiliary slot 4 is shown to be rectangular; as shown Figure 7 The auxiliary groove 4 is shown to be in the form of an arc.

[0050] In some embodiments of the present invention, the variation of at least one parameter of the auxiliary slot 4 along the axial direction is related to the axial harmonic distribution characteristics of the motor air gap magnetic field.

[0051] In some embodiments of the present invention, at least one parameter of the auxiliary groove 4 is configured to vary along the axial direction to produce a synergistic suppression effect on radial electromagnetic force waves of different orders.

[0052] Optionally, the design of the stator core 1 can be non-incompatible with other suppression technologies such as rotor skew poles and unequal air gaps, and can be used in combination.

[0053] To this end, this application also proposes a design method for motor stator core 1, including analyzing the axial distribution characteristics of the magnetic field, determining the variation law of the slot parameters, and setting the arrangement form or shape of the auxiliary slot 4 along the axial direction according to the axial distribution characteristics of the magnetic field and the variation law of the slot parameters.

[0054] The motor according to an embodiment of the present invention includes the aforementioned stator core 1.

[0055] According to an embodiment of the present invention, by applying the aforementioned stator core 1, the electromagnetic vibration and noise of the motor are reduced throughout the entire operating range.

[0056] The vehicle according to an embodiment of the present invention includes the aforementioned stator core 1 or the aforementioned motor.

[0057] According to embodiments of the present invention, the stability of vehicle operation can be improved by applying the aforementioned stator core 1 or motor.

[0058] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0059] Furthermore, the terms "first" and "second" are used for descriptive 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 description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0060] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0061] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described 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 the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A stator core (1), characterized in that, include: The yoke (2), the teeth, and the toothed shoe (3) disposed on the side of the teeth away from the yoke (2) are provided. The teeth are evenly distributed around the yoke (2). At least a portion of the toothed shoe (3) has an auxiliary groove (4) extending axially along the stator core (1) on its inner peripheral wall. At least one parameter of the auxiliary groove (4) varies axially.

2. The stator core (1) according to claim 1, characterized in that, At least one parameter of the auxiliary groove (4) varies continuously along the axial direction.

3. The stator core (1) according to claim 1, characterized in that, The inner wall of at least one side of the auxiliary groove (4) extends along a curve.

4. The stator core (1) according to claim 1, characterized in that, At least one parameter of the auxiliary groove (4) varies in segments along the axial direction.

5. The stator core (1) according to claim 4, characterized in that, It includes multiple stator laminations stacked along the axial direction, each stator lamination having a sub-auxiliary groove (4), the multiple sub-auxiliary grooves (4) being connected along the axial direction to form at least three segments, adjacent segments being connected along the axial direction to form the auxiliary groove (4), the multiple segments having different parameters.

6. The stator core (1) according to claim 5, characterized in that, The multiple segments include a first segment (41), a second segment (42), a third segment (43), a fourth segment (44), and a fifth segment connected sequentially along the axial direction. The first segment (41), the second segment (42), the third segment (43), the fourth segment (44), and the fifth segment all have different depths along the radial direction of the stator core (1).

7. The stator core (1) according to claim 5, characterized in that, In the axial direction, the depth dimension of the plurality of sub-auxiliary grooves (4) gradually increases or decreases from one end to the other; or In the axial direction, a plurality of the sub-auxiliary grooves (4) form a plurality of stages from one end to the other, and the depth dimensions of the sub-auxiliary grooves (4) located in the stages are different.

8. The stator core (1) according to claim 2 or 4, characterized in that, The parameters of the auxiliary groove (4) include one or more combinations of the depth, width, shape, and number of the auxiliary groove (4); and / or The variation of at least one parameter of the auxiliary slot (4) along the axial direction is related to the axial harmonic distribution characteristics of the motor air gap magnetic field; and / or The axial variation of at least one parameter of the auxiliary groove (4) is configured to produce a synergistic suppression effect on radial electromagnetic force waves of different orders.

9. An electric motor, characterized in that, include: The stator core (1) according to any one of claims 1-8.

10. A vehicle, characterized in that, include: The stator core (1) according to any one of claims 1-8 or the motor according to claim 9.

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