Rotor punching sheet, rotor iron core, rotor, motor, power assembly and vehicle

Abstract

The embodiment of the invention provides a rotor punching sheet. The rotor punching sheet comprises a plurality of magnetic slot units arranged along the circumferential direction of the rotor punching sheet; the rotor punching sheet is provided with a peripheral wall, the peripheral wall comprises a plurality of arc-shaped peripheral wall sections which are sequentially distributed along the circumferential direction of the rotor punching sheet, and one arc-shaped peripheral wall section corresponds to one magnetic slot unit; each magnetic slot unit comprises a first magnetic slot and a second magnetic slot which are arranged along the radial direction of the rotor punching sheet, and the ratio of the minimum distance between the first magnetic slot and the second magnetic slot to the arc length of the arc-shaped circumferential wall section in the circumferential direction of the rotor punching sheet is 0.05-0.08, so that the magnetic circuit saturation position can be changed, and the suppression problem of magnetic circuit saturation on the output performance of the motor is effectively improved.

Description

Technical Field

[0001] The present application belongs to the field of vehicle technology, and specifically relates to a rotor punching sheet, a rotor core, a rotor, a motor, a power assembly and a vehicle. Background Art

[0002] In traditional motors, the rotor core is usually made of silicon steel sheets. The rotor core made of silicon steel sheets has disadvantages such as large eddy current loss and high energy consumption, and the motor efficiency is low.

[0003] The amorphous alloy motor disclosed in the related technology has a rotor core made of amorphous alloy material. Amorphous alloy has very excellent soft magnetic properties. Its magnetic permeability and resistivity are higher than those of silicon steel sheets, and its coercive force and eddy current effect are smaller than those of silicon steel sheets, which reduces the eddy current loss of the rotor core. However, its material properties are unstable. During the operation of the motor, the rotor core is prone to risks of deformation, breakage, and magnetic leakage, which reduces the reliability of the motor. Summary of the invention

[0004] The present application aims to provide a rotor punching sheet, a rotor core, a rotor, a motor, a power assembly and a vehicle to solve the problem of reduced reliability of existing motors using amorphous rotor cores.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, the present application discloses a rotor punching, comprising: a plurality of magnetic slot units arranged along the circumference of the rotor punching; the rotor punching has an outer peripheral wall, the outer peripheral wall comprises a plurality of arc-shaped peripheral wall segments sequentially distributed along the circumference of the rotor punching, and one arc-shaped peripheral wall segment corresponds to one magnetic slot unit;

[0007] Each magnetic slot unit includes a first magnetic slot and a second magnetic slot arranged radially along the rotor punching sheet, and the ratio of the minimum spacing between the first magnetic slot and the second magnetic slot to the arc length of the arc-shaped peripheral wall section in the circumferential direction of the rotor punching sheet is between 0.05 and 0.08.

[0008] Optionally, the magnetic slot unit includes a first magnetic slot group and a second magnetic slot group, the first magnetic slot group and the second magnetic slot group are distributed at intervals along the radial direction of the rotor punching, and the second magnetic slot group is close to the center of the rotor punching, wherein the magnetic slots arranged in the first magnetic slot group are first magnetic slots, and there are at least two first magnetic slots, and the magnetic slots arranged in the second magnetic slot group are second magnetic slots, and there are at least two second magnetic slots.

[0009] Optionally, a minimum distance between a first magnetic groove and a second magnetic groove that are close to each other in the first magnetic groove group and the second magnetic groove group is 1.5 mm to 15 mm.

[0010] Optionally, two first magnetic slots in the first magnetic slot group are spaced apart in the circumferential direction of the rotor core, the first magnetic slot has a first center line extending in the radial direction of the rotor core, and a first angle is formed between the first center lines of the two first magnetic slots; two second magnetic slots in the second magnetic slot group are spaced apart in the circumferential direction of the rotor core, the second magnetic slot has a second center line extending in the radial direction of the rotor core, and a second angle is formed between the second center lines of the two second magnetic slots;

[0011] The ratio of the first angle to the second angle is the angle ratio, and the angle ratio is 0.75 to 1.9.

[0012] Optionally, the angle ratio is 1.03 to 1.89.

[0013] Optionally, the rotor punching is made of an amorphous alloy material, and the magnetic slot unit includes a plurality of magnetic slots, which are used to install permanent magnets; wherein the number of magnetic slot units is a first number, the sum of the number of magnetic slots in one magnetic slot unit is a second number, and the ratio of the first number to the second number satisfies a first preset range, and the first preset range is 0.66 to 7.

[0014] Optionally, the first preset range is 1-2.

[0015] In a second aspect, the present application also discloses a rotor core, which includes the above-mentioned rotor punchings, wherein a plurality of rotor punchings are stacked axially along the rotor core, and each rotor punching includes at least two layers of amorphous alloy sheets stacked axially along the rotor core.

[0016] In a third aspect, the present application further discloses a rotor, which includes the above-mentioned rotor core, and a plurality of rotor cores are reset along the axial direction.

[0017] In a fourth aspect, the present application further discloses a motor, the motor comprising:

[0018] case;

[0019] A stator, which is arranged in the housing;

[0020] And the above-mentioned rotor is arranged in the housing and connected to the stator.

[0021] Optionally, the stator comprises:

[0022] The stator core is made of amorphous alloy material, and the stator core comprises a plurality of stator punching sheets stacked along the axial direction of the stator core, and each stator punching sheet comprises at least two layers of amorphous alloy sheets stacked along the axial direction of the stator core.

[0023] Optionally, the stator core is provided with a plurality of teeth and a yoke, the plurality of teeth are spaced apart along the circumferential direction of the stator core, and the yoke is connected to a side of the plurality of teeth away from the center of the stator core; wherein the length of the yoke along the radial direction of the stator core is a first length, the length of the tooth along the radial direction of the stator core is a second length, and the ratio of the first length to the second length satisfies a second preset range, and the second preset range is 0.95 to 1.52.

[0024] Optionally, the second preset range is 1.15 to 1.3.

[0025] Optionally, the tooth portion includes two side walls disposed away from each other along the circumferential direction of the stator core;

[0026] At least part of the teeth is provided with an arc groove at one end of the side wall away from the yoke.

[0027] Optionally, the curvature of the arc-shaped groove is 0.2-0.8.

[0028] Optionally, the ratio of the maximum dimension of the arc-shaped slot in the radial direction of the stator punching sheet to the dimension of the tooth portion in the radial direction of the stator punching sheet is between 5% and 20%.

[0029] Optionally, a stator slot is formed between two adjacent tooth portions, and the length of the stator slot along the radial direction of the stator core is equal to the second length.

[0030] Optionally, the second length is 15 mm to 20 mm.

[0031] In a fifth aspect, the present application also discloses a powertrain, including the above-mentioned motor.

[0032] In a sixth aspect, the present application also discloses a vehicle, comprising the above-mentioned motor or powertrain.

[0033] In an embodiment of the present application, the ratio of the minimum spacing between the first magnetic groove and the second magnetic groove to the arc length of the arc-shaped circumferential wall segment in the circumferential direction of the rotor punching is set between 0.05 and 0.08, thereby changing the magnetic circuit saturation position and effectively improving the problem of magnetic circuit saturation inhibiting the output performance of the motor.

[0034] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0036] Figure 1 is a schematic structural diagram of a rotor described in an embodiment of the present application;

[0037] Figure 2 yes Figure 1 A schematic diagram of a partial structure of a rotor shown;

[0038] Figure 3 It is the influence diagram of the direct-to-cross-pitch ratio and the motor output torque;

[0039] Figure 4 This is the influence diagram of the minimum distance between two adjacent layers of magnetic slots on the magnetic flux density and the motor output torque;

[0040] Figure 5 It is the influence diagram of the minimum distance between the magnetic slots of adjacent magnetic poles and the motor output torque;

[0041] Figure 6 is the influence diagram of angle ratio and stress;

[0042] Figure 7 It is a schematic diagram of the tearing structure of an amorphous alloy sheet;

[0043] Figure 8 This is the effect of the magnetic slot factor on the motor's limiting speed and output torque;

[0044] Fig. 9 This is the effect of different numbers of magnetic poles on stress;

[0045] Fig.10 This is a graph showing the effect of different numbers of magnetic poles on the peak torque and operating efficiency of the motor;

[0046] Fig.11 This is a graph showing the effect of different magnetic bridge widths on the peak power and operating efficiency of the motor;

[0047] Fig.12 is a structural schematic diagram of a stator shown in an embodiment of the present application;

[0048] Fig.13 It is a partial structural schematic diagram of a stator core shown in an embodiment of the present application;

[0049] Fig.14 yes Fig.13 An enlarged schematic diagram of point A is shown;

[0050] Fig.15 This is a comparison chart of the magnetization curves of amorphous alloy materials and silicon steel materials;

[0051] Fig.16 It is a comparison chart of the magnetic permeability μr curves of amorphous alloy materials and silicon steel materials;

[0052] Figure 17-Figure 18 This is a comparison chart of the torque-to-current ratio between amorphous motors and silicon steel motors under different speeds and load conditions;

[0053] Fig.19It is a magnetic flux distribution diagram of a motor;

[0054] Fig. 20 is the magnetization curve of an amorphous material;

[0055] Fig.21 The embodiment of the present application provides a stator core yoke tooth ratio iron loss distribution outside the second preset range;

[0056] Fig. 22 The embodiment of the present application provides a stator core tooth-yoke ratio iron loss distribution within a second preset range;

[0057] Fig.23 is a comparison diagram of the ratio of the first length to the second length of the stator core and the motor efficiency according to an embodiment of the present application;

[0058] Fig.24 This is an influence diagram of the yoke tooth ratio of a stator core and the output torque of a motor provided in an embodiment of the present application.

[0059] Figure numerals: 1, stator; 10, stator core; 11, yoke; 12, tooth; 121, side wall; 122, arc slot; 111, through hole; M, center plane; he, first length; hc, second length; 13, stator slot; 2, cover plate; 20, rotor punching; 21, magnetic slot unit; 210, first magnetic slot group; 211, second magnetic slot group; 2100, first magnetic slot; 2110, second magnetic slot; F, center axis; α, arc length; h, minimum spacing. DETAILED DESCRIPTION

[0060] Embodiments of the present invention will be described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0061] The term "first" or "second" in the specification and claims of the present application may include one or more of the features explicitly or implicitly. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0062] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0063] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0064] An embodiment of the present application provides a rotor punching, and the rotor punching of the present application is described in detail below with reference to the accompanying drawings.

[0065] Reference Figure 1-Figure 2 , Figure 1 A schematic structural diagram of a rotor according to an embodiment of the present application is shown; Figure 2 Shows Figure 1 A partial structural schematic diagram of a rotor is shown; the embodiment of the present application discloses a rotor punching 20, specifically, a rotor punching 20 made of an amorphous alloy material, wherein the rotor punching 20 is provided with a plurality of magnetic slot units 21 spaced apart in the circumferential direction, and the rotor punching 20 has an outer peripheral wall, and the outer peripheral wall includes a plurality of arc-shaped peripheral wall segments sequentially distributed in the circumferential direction of the rotor punching 20, and one arc-shaped peripheral wall segment corresponds to one magnetic slot unit 21. In each magnetic slot unit 21, a first magnetic slot 2100 and a second magnetic slot 2110 are provided in the radial direction of the rotor punching, and the ratio of the minimum spacing between the first magnetic slot 2100 and the second magnetic slot 2110 to the arc length of the arc-shaped peripheral wall segment in the circumferential direction of the rotor punching is between 0.05 and 0.08.

[0066] Specifically, in the embodiment of the present application, the minimum spacing h between the first magnetic slot 2100 and the second magnetic slot 2110 which are close to each other in the magnetic slot unit 21 is defined as the direct-axis distance, and the arc length α of the arc-shaped circumferential wall segment in the circumferential direction of the rotor punching 20 is defined as the cross-axis distance. By controlling the ratio of the direct-axis distance to the cross-axis distance, that is, the direct-to-cross-axis ratio, the direct-to-cross-axis ratio is made to be between 0.05 and 0.08, thereby changing the magnetic circuit saturation position, and effectively improving the problem of the suppression of the magnetic circuit saturation on the output performance of the motor.

[0067] Optionally, the magnetic slot unit 21 includes a first magnetic slot group 210 and a second magnetic slot group 211, the first magnetic slot group 210 and the second magnetic slot group 211 are distributed at radial intervals along the rotor punching 20, and the second magnetic slot group 211 is close to the center of the rotor core, wherein the magnetic slots arranged in the first magnetic slot group 210 are first magnetic slots 2100, and there are at least two first magnetic slots 2100, and the magnetic slots arranged in the second magnetic slot group 211 are second magnetic slots 2110, and there are at least two second magnetic slots 2110.

[0068] In the embodiment of the present application, since a plurality of magnetic slot units 21 are provided, and the plurality of magnetic slot units 21 are arranged at intervals along the circumference of the rotor sheet 20, the permanent magnets can be distributed more evenly, and the vibration and noise of the motor operation can be effectively reduced. Since the first magnetic slot group 210 and the second magnetic slot group 211 are provided, and the first magnetic slot group 210 and the second magnetic slot group 211 are arranged at intervals along the radial direction of the rotor sheet 20, the magnetic circuit can be optimized, which is beneficial to improving the output performance and motor efficiency of the motor.

[0069] The first magnetic slot group 210 and / or the second magnetic slot group 211 of the embodiment of the present application can be a straight line, a V-shaped, a U-shaped or other shape, which is not limited here, and those skilled in the art can adjust it according to actual needs. In addition, the embodiment of the present application does not limit the number of first magnetic slots 2100 in the first magnetic slot group 210 and the number of second magnetic slots 2110 in the second magnetic slot group 211, and those skilled in the art can adjust it according to actual needs. In one embodiment, if Figure 1 and Figure 2 As shown, the first magnetic slot group 210 is V-shaped, and the second magnetic slot group 211 is U-shaped, wherein the first magnetic slot group 210 includes two first magnetic slots 2100 , and the second magnetic slot group 211 includes four second magnetic slots 2110 .

[0070] Specifically, in the actual optimization process, when the first magnetic slot group 210 is moved toward the center of the rotor punching 20, the flow width of the cross-axis magnetic field can be increased, thereby reducing the cross-axis magnetic resistance and its saturation degree. However, after the first magnetic slot group 210 is moved toward the center of the rotor punching 20, the flow length of the magnetic field will be lengthened, that is, the flow length of the direct-axis magnetic field will increase, thereby increasing the direct-axis magnetic resistance, resulting in an increase in the motor salient pole ratio (Ld / Lq) or the second half of formula (2), which increases the magnetic resistance, resulting in a decrease in the effective magnetic flux, and ultimately reducing the output torque. Through the above analysis, local magnetic circuit saturation is caused by the interaction between the armature magnetic field and the permanent magnetic field. Both magnetic fields produce a large amount of magnetic voltage drop on the air gap. Within a certain range of electromagnetic air gap length (such as 0.5mm~3.0mm), it can be seen from formula (3) that the magnetic resistance of the air gap is inversely proportional to the cross-sectional area of ​​the air gap, that is, the magnetic resistance is inversely proportional to the rotor radius. In summary, the rotor's direct axis distance and quadrature axis distance will directly affect the rotor's saturation position and saturation degree. Figure 3 As shown, by controlling the orthogonal pitch ratio within the range of 0.05 to 0.08, the output performance of the motor can be effectively improved.

[0071] like Figures 4 to 5 As shown, the spacing between the first magnetic slots 2100 and the second magnetic slots 2110 close to each other in the first magnetic slot group 210 and the second magnetic slot group 211, and the spacing between the two second magnetic slots 2110 close to each other in two adjacent second magnetic slot groups 211 will affect the output torque of the motor to varying degrees. It should be noted that Fig. 9 It is characterized by the magnetic flux density at that location.

[0072] In some optional embodiments of the present application, the minimum spacing h between the first magnetic slot 2100 and the second magnetic slot 2110 that are close to each other in the first magnetic slot group 210 and the second magnetic slot group 211 is 1.5 mm to 15 mm. It should be noted that the above-mentioned straight axis distance is also the narrowest position of the magnetic bridge between the first magnetic slot 2100 and the second magnetic slot 2110 that are close to each other in the first magnetic slot group 210 and the second magnetic slot group 211.

[0073] In the embodiment of the present application, by limiting the minimum spacing h between the first magnetic slot 2100 and the second magnetic slot 2110 that are close to each other in the first magnetic slot group 210 and the second magnetic slot group 211, that is, the narrowest position of the magnetic bridge between the first magnetic slot 2100 and the second magnetic slot 2110 that are close to each other in the first magnetic slot group 210 and the second magnetic slot group 211, not only can the motor have good output performance, but also the risk of deformation or even breakage of the magnetic bridge during the operation of the motor can be effectively avoided, which is beneficial to improving the operation reliability of the motor.

[0074] Since the spacing of the second magnetic slot group 211 close to the center of the rotor sheet 20 in two adjacent magnetic slot units 21 is smaller than the spacing of the first magnetic slot group 210 away from the center of the rotor sheet 20. Based on this, in some optional embodiments of the present application, the minimum spacing (hereinafter referred to as inter-pole width) between two second magnetic slots 2110 close to each other in two second magnetic slot groups 211 adjacently arranged along the circumference of the rotor sheet 20 is 1.5mm-15mm, that is, the width of the narrowest position of the magnetic bridge between two second magnetic slots 2110 close to each other in two second magnetic slot groups 211 adjacently arranged along the circumference of the rotor sheet 20 is 1.5mm-15mm. In this way, not only can the motor have good output performance, but also the risk of deformation or even fracture of the magnetic bridge during the operation of the motor can be avoided, which is conducive to improving the operation reliability of the motor.

[0075] According to tests, when the orthogonal spacing ratio meets the requirement of 0.05-0.08 and the minimum spacing between two second magnetic slots 2110 close to each other in two second magnetic slot groups 211 adjacent to each other along the circumferential direction of the rotor punching 20 meets the requirement of 1.5mm-15mm, the local magnetic flux density of the rotor does not exceed 1.8T when the motor is operated under rated conditions or full load conditions. This can not only prevent the output performance of the motor from being affected by local magnetic circuit saturation, but also reduce the loss of the motor, which is beneficial to improving the efficiency of the motor.

[0076] In addition, amorphous alloy materials themselves are made by rapid and extreme cooling. On the one hand, their atomic structure is disordered and has no lattice characteristics, so they have high tensile strength and are linear elastic bodies without plastic deformation processes. On the other hand, amorphous alloys are in a relatively high free energy state, and their material properties are unstable. Under certain temperature and pressure conditions, there is a risk of structural relaxation or crystallization, which leads to a significant deterioration in mechanical properties.

[0077] Optionally, the magnetic slot group has a central axis F; the two first magnetic slots 2100 in the first magnetic slot group 210 are arranged on both sides of the central axis F along the circumferential interval of the rotor punching 20, and a first angle is formed between the center lines of the two first magnetic slots 2100; the two second magnetic slots 2110 in the first magnetic slot group 210 are arranged on both sides of the central axis F along the circumferential interval of the rotor punching 20, and a second angle is formed between the center lines of the two second magnetic slots 2110; wherein the ratio of the first angle to the second angle ranges from 0.75 to 1.9.

[0078] Specifically, Figure 2As shown in the figure, the dotted line shows the center axis F of the magnetic slot group, which is also the direct axis of the magnetic slot group. In the embodiment of the present application, by controlling the range of the angle ratio to be 0.75 to 1.9, the distance between the first magnetic slot group 210 and the second magnetic slot group 211 can be effectively avoided. On the one hand, the problem of excessive saturation of the local magnetic circuit of the rotor can be avoided, which is conducive to improving the output performance of the motor. On the other hand, Figure 6 As shown, the stress value at the magnetic bridge can be reduced to a certain extent, avoiding the risk of deformation or even fracture of the magnetic bridge during motor operation, which is beneficial to improving the operating reliability of the motor. Furthermore, when the angle ratio is 1.03 to 1.89, the output performance and operating reliability of the motor can be further improved.

[0079] It should be noted that the embodiments of the present application do not limit the specific values ​​of the first angle and the second angle, and those skilled in the art can adjust them according to actual needs. In one embodiment, the value range of the first angle is 100° to 180°, and the value range of the second angle is 103° to 180°. Figure 1 and Figure 2 As shown, for the V-shaped first magnetic groove group 210, the first angle refers to the angle formed between the center lines of the two first magnetic grooves 2100; for the U-shaped second magnetic groove group 211, the second angle refers to the smaller angle of the angle formed between the center lines of the two second magnetic grooves 2110 located on the inner side and the angle formed between the center lines of the two second magnetic grooves 2110 located on the outer side.

[0080] Specifically, in actual operation of the motor, the rotor sheet 20 will be locally saturated. In order to reduce the magnetic resistance of the permanent magnetic field passing through the rotor saturation area, the permanent magnet, that is, the magnetic slot unit 21 is usually moved in a direction away from the center of the rotor sheet 20. If the first magnetic slot group 210 and the second magnetic slot group 211 move in a direction away from the center of the rotor sheet 20 at the same time, the spacing between the first magnetic slot group 210 and the second magnetic slot group 211 may be too small, resulting in local magnetic circuit saturation and a decrease in motor torque. Considering the characteristics of the hysteresis loop of amorphous alloy materials, the area of ​​the local magnetic circuit saturation area can be reduced by adjusting the ratio of the first angle to the second angle, especially when the angle ratio is 1.03 to 1.89, the first magnetic slot group 210 and the second magnetic slot group 211 are roughly distributed in a triangle, which can effectively improve the phenomenon of local magnetic circuit saturation.

[0081] Specifically, a rotor punching 20 made of an amorphous alloy material has a plurality of magnetic slot units 21 arranged at intervals along the circumferential direction, and the magnetic slot unit 21 includes a plurality of magnetic slots, which are used to install permanent magnets; wherein the number of the magnetic slot units 21 is a first number, the sum of the numbers of the magnetic slots in one magnetic slot unit 21 is a second number, and the ratio of the first number to the second number satisfies a first preset range, and the first preset range is 0.66 to 7.

[0082] Furthermore, there are multiple rotor punchings 20, and the multiple rotor punchings 20 are stacked along the axial direction of the rotor. Each rotor punching 20 includes at least two layers of amorphous alloy sheets stacked along the axial direction of the rotor punching 20, so that the rotor core has both good mechanical properties and magnetic properties.

[0083] The rotor punching 20 made of amorphous alloy material includes multiple layers of amorphous alloy sheets. When it needs to be explained, taking amorphous alloy strip as an example, it is obtained by rapidly cooling molten metal on a roller through rapid extreme cold spraying to obtain an amorphous metal strip with a thickness of less than 0.1 mm. The cooling rate can reach 105-106℃ / s, which ensures that the metal is difficult to crystallize and forms irregularly arranged atoms, so that there is no lattice or grain boundary inside the amorphous material, so that the material of the amorphous metal strip has higher mechanical properties than silicon steel material, such as higher tensile strength and compressive strength, and better magnetic properties: low loss, etc.

[0084] Considering that the rotor punching sheet 20 may be subjected to conditions such as stamping, cutting, and heating during the preparation and operation process, the mechanical properties of the amorphous alloy material may deteriorate. Figure 7 As shown, on the one hand, the stamping process will inevitably form a stress zone on the edge of the material, and on the other hand, stamping and cutting will form uneven defective openings on the edge of the amorphous alloy strip. In this way, when the peeled amorphous alloy sheet is subjected to external force, if stress concentration occurs, the amorphous alloy sheet will be torn at the defective opening, resulting in partial damage to the rotor punching 20. When the local damage extends to the inside of the rotor punching 20, damage will occur, and in severe cases, safety problems such as bore scraping will occur, thereby affecting the reliability of the motor.

[0085] In practical applications, in order to improve the reliability of the motor, it is possible to consider increasing the width of the magnetic bridge and / or the number of magnetic bridges, which can better overcome the centrifugal force generated by the operation of the motor, thereby reducing the stress concentration phenomenon. However, increasing the width of the magnetic bridge and / or the number of magnetic bridges will increase the leakage flux and reduce the effective magnetic flux of the motor. Based on this, in some optional embodiments of the present application, such as Figure 1 and Figure 2As shown, the first number of magnetic slot units 21 in a rotor punching 20 and the sum of the number of magnetic slots in a magnetic slot unit 21 are the second number, and the ratio of the first number to the second number is the magnetic slot factor, and the magnetic slot factor meets the first preset range, and the first preset range is between 0.66 and 7. It should be noted that by installing permanent magnets in the magnetic slots, magnetic poles can be formed, and the number of magnetic poles is consistent with the number of magnetic slot units 21, and two adjacent magnetic poles constitute a magnetic pole pair. In addition, permanent magnets include but are not limited to ferrite permanent magnets, aluminum nickel cobalt permanent magnets, neodymium iron boron permanent magnets, samarium cobalt permanent magnets, iron nitride permanent magnets, etc.

[0086] In the embodiment of the present application, since a plurality of magnetic slot units 21 are provided, and the plurality of magnetic slot units 21 are provided at intervals along the circumference of the rotor punching 20, the magnetic components can be distributed more evenly, and the vibration and noise of the motor operation can be effectively reduced. By adjusting the magnetic slot factor, the number and width of the magnetic bridges of the rotor punching 20 can be controlled within a suitable range. In this way, not only can the stress concentration phenomenon during the operation of the motor be reduced, but also the leakage magnetic phenomenon can be effectively controlled, thereby increasing the effective magnetic flux of the motor, which is beneficial to improving the output performance of the motor. After testing, as Figure 8 As shown, when the magnetic slot factor satisfies the preset range of 0.66 to 7, the rotor punching 20 can have enough magnetic slot units 21 and magnetic slots to reduce stress concentration, thereby reducing the risk of deformation and fracture of the rotor punching 20, and can also reduce the leakage magnetic problem caused by the increase in the number of magnetic bridges, thereby improving the reliability of the motor.

[0087] Furthermore, the first preset range is 1 to 2, which can further improve the output performance of the motor.

[0088] Specifically, taking the adjustment of the number of magnetic bridges as an example, when the motor speed remains unchanged, Fig. 9 As shown in FIG. 1 , as the number of magnetic pole pairs increases, that is, the number of magnetic slot units 21 increases, the number of magnetic bridges of the rotor punching 20 increases accordingly, and the stress value at each magnetic bridge decreases accordingly, thereby enhancing the ability of the magnetic bridge to overcome the centrifugal force. Fig.10 As shown in FIG. 1 , as the number of magnetic pole pairs increases, that is, the number of magnetic slot units 21 increases, the motor frequency will increase, resulting in increased iron loss, causing the peak torque and operating efficiency of the motor to decrease. Taking the adjustment of the magnetic bridge width as an example, when the motor speed remains unchanged, as Fig.11 As shown in the figure, as the width of the magnetic bridge increases, the peak power of the motor gradually decreases, while the working efficiency of the motor improves. According to the test, when the magnetic slot factor meets 0.66-7, the number of magnetic bridges and the width of the magnetic bridge can be controlled within a suitable range, thereby improving the output performance and efficiency of the motor.

[0089] It should be noted that the magnetic bridge in the embodiment of the present application refers to a magnetic slot unit 21 formed between two adjacent magnetic slots. In addition, in order to avoid locally exceeding the tensile limit of the amorphous alloy material, the stress value of the magnetic bridge in the embodiment of the present application should be less than or equal to 2000Mpa, thereby avoiding the risk of deformation or even fracture of the magnetic bridge during the operation of the motor, which is conducive to improving the operating reliability of the motor.

[0090] A rotor core is also provided in an embodiment of the present application, and the rotor core includes a plurality of rotor punchings 20 described in any of the above embodiments, and the plurality of rotor punchings 20 are stacked along the axial direction of the rotor core, and each of the rotor punchings 20 includes at least two layers of amorphous alloy sheets stacked along the axial direction of the rotor core.

[0091] Specifically, since the thickness of the amorphous alloy sheet is relatively small, usually at least two layers of amorphous alloy sheets are stacked together. When there are too many layers, the hardness of the amorphous strip is high, resulting in a short mold life. When there are too few layers, the thickness of the amorphous strip is thin, resulting in a long processing time. Optionally, the amorphous alloy sheet can be 2-10 layers, preferably, the amorphous alloy sheet can be 3-6 layers, and each rotor core includes multiple layers of rotor punchings 20. Optionally, each rotor core can include 100-300 rotor punchings 20.

[0092] It should be noted that in the embodiment of the present application, the structure of the rotor punching 20 is the same as the structure of the rotor punching 20 in any of the above embodiments, and its beneficial effects are also similar, which will not be elaborated here.

[0093] The embodiment of the present application further provides a rotor, which includes the multiple rotor cores described in the above embodiment, and the multiple rotor cores are arranged at intervals along the axial direction.

[0094] Further, each rotor may include 4-16 rotor cores.

[0095] An embodiment of the present application further discloses a motor, comprising: a housing; a stator 1, wherein the stator 1 is disposed in the housing; and a rotor, which is the rotor described in any of the above embodiments, wherein the rotor is disposed in the housing and connected to the stator 1.

[0096] Specifically, the housing is arranged outside the stator and the rotor to protect the stator and rotor assembly. The armature winding is installed inside the stator, the permanent magnet is installed on the rotor, and the stator is sleeved on the outside of the rotor.

[0097] Furthermore, there are multiple stator cores 10, and the multiple stator cores 10 are stacked along the axial direction of the stator core, and each of the stator punching sheets includes at least two layers of non-gold alloy sheets stacked along the axial direction of the stator core.

[0098] It should be noted that in the embodiment of the present application, the structure of the rotor is the same as the structure of the rotor in any of the above embodiments, and its beneficial effects are also similar, which will not be elaborated here.

[0099] Optionally, refer to Figure 12-14 The stator punching sheet described in the embodiment of the present application includes: a stator core 10 made of an amorphous alloy material, a plurality of teeth 12 and a yoke 11 are provided on the stator core 10, the plurality of teeth 12 are arranged at intervals along the circumferential direction of the stator core 10, and the yoke 11 is connected to the side of the plurality of teeth 12 away from the center of the stator core; wherein the radial length of the yoke 11 along the stator core 10 is a first length he, the radial length of the tooth 12 along the stator core 10 is a second length hc, and the ratio of the first length he to the second length hc satisfies a second preset range, and the second preset range is 0.95 to 1.52.

[0100] The stator punching sheet 10 made of amorphous alloy material includes a plurality of amorphous alloy sheets stacked along the circumference of the stator punching sheet 10. It should be noted that, taking the amorphous alloy strip as an example, it is a thin strip with a thickness of less than 0.1 mm obtained by rapid and extremely cold spraying of molten metal on a roller for rapid cooling, and its cooling rate can reach 105-106°C / s, thereby ensuring that the metal is difficult to crystallize and irregularly arranged atoms are formed, so that there is no lattice or grain boundary inside the amorphous material. In addition, the amorphous alloy strip has higher mechanical properties (such as higher tensile strength, compressive strength, etc.) and better magnetic properties (such as low loss, etc.). When the amorphous alloy strip is processed to form an amorphous alloy sheet, the amorphous alloy sheet is formed into a stator punching sheet by stamping.

[0101] In practical applications, amorphous alloy strips include but are not limited to iron-based amorphous alloy strips, iron-nickel-based alloy strips, etc. The difficulty in preparing the above-mentioned amorphous alloy strips lies in controlling the uniformity of forming. Generally speaking, since the molten metal needs to be released on the roller through a nozzle for rapid cooling, this process causes the amorphous alloy strip to have a larger width, and its uniformity of forming decreases accordingly, thereby affecting the yield of the amorphous alloy strip. At present, the width of amorphous alloy strips with a higher yield rate is generally below 200mm, however, the outer diameter of the stator punching sheet 10 may be greater than 200mm. Based on this, in order to improve the yield rate of amorphous alloy strip manufacturing with large size, the iron content can be appropriately reduced in the preparation process of the amorphous alloy strip, so that not only the uniformity of forming of the amorphous alloy strip can be improved, but also the resistivity of the amorphous alloy strip can be improved, and the eddy current loss (that is, the iron loss) can be reduced.

[0102] Specifically, in the motor, the eddy current loss P on the stator lamination can be expressed by Formula 1;

[0103]

[0104] Among them, u is the induced potential generated by the alternating magnetic field, s is the conductor cross-sectional area (i.e., the thickness of the amorphous alloy), l is the length of the induced current flow path, and ρ is the eddy current path resistivity (i.e., the resistivity of the amorphous material). It can be seen from the above formula that by increasing the resistivity ρ, the eddy current loss can be reduced. In one embodiment, the resistivity ρ can be increased by reducing the content of the iron element. Since the iron element is a good conductor element, when the iron element content is reduced, the resistivity ρ increases, thereby reducing the eddy current loss, which is beneficial to improving the efficiency of the amorphous motor.

[0105] However, iron is also a magnetic conductive element. When the iron content is reduced, on the one hand, the saturation flux density of the amorphous alloy material will decrease. Taking amorphous motors and silicon steel motors as examples, refer to Fig.15 , showing the magnetization curve comparison of amorphous alloy material and silicon steel material. Iron is a magnetic conductive element. Reducing the iron content in the amorphous ribbon will lead to a decrease in the saturation magnetic flux density of the amorphous alloy material. Fig.15 It can be concluded that compared with the magnetic flux density B of silicon steel materials, the magnetic flux density B of amorphous alloy materials has a significant decrease, resulting in insufficient output torque of amorphous motors under heavy load. Fig.16 The comparison of the magnetic permeability μ curves of amorphous alloy materials and silicon steel materials is shown in Fig.16 It can be concluded that the magnetic permeability μ of amorphous alloy materials begins to drop sharply above 0.8T, even lower than that of silicon steel motors, which will cause magnetic circuit saturation during the operation of the amorphous motor. After the magnetic circuit is saturated, a higher armature current needs to be input to compensate for the torque loss caused by the decrease in magnetic permeability μ to ensure the output torque of the motor. However, the increase in armature current will cause the copper loss of the amorphous motor to increase, reducing the motor operation efficiency.

[0106] During the operation of the motor, the expression formula of the motor output torque is:

[0107] T∝pψi q +(L d -L q )i d i q (1)

[0108]

[0109] In formula (2), T is the output torque of the motor, p is the number of pole pairs of the motor, ψ is the permanent magnet flux, Ld is the direct axis inductance, Lq is the quadrature axis inductance, id is the direct axis current of the armature winding, and iq is the quadrature axis current of the armature winding. In formula (3), L is the inductance, μ is the magnetic permeability, A is the cross-sectional area of ​​the magnetic core, N is the number of turns of the coil, and l is the magnetic path length of the magnetic core. When the motor saturation is low, the magnetic permeability μ is high, and when the saturation is high, the magnetic permeability μ is low. It can be obtained from the above formula that when the motor saturation is high, the magnetic permeability μ is low, and when the motor saturation is low, the magnetic permeability μ is high. In formula (2), the first half is the permanent magnet torque, and the second half is the reluctance torque. When the motor is running at the highest load stage, the motor saturation increases and the magnetic permeability μ decreases, resulting in insufficient output torque. After the magnetic circuit is saturated, a higher armature current needs to be input to compensate for the torque loss caused by the decrease in magnetic permeability μ to ensure the output torque of the motor. However, the increase in armature current will cause the copper loss of the amorphous motor to increase, reducing the motor's operating efficiency.

[0110] Specifically, taking amorphous motors and silicon steel motors as examples, refer to Fig.17 and Fig.18 The following figure shows the torque-current ratio comparison of amorphous motor and silicon steel motor under different speed and load conditions. Fig.17 and Fig.18 It can be concluded that Fig.17 This is a comparison chart of the torque-current ratio between amorphous motor and silicon steel motor before the turning speed (such as 3000rpn). Fig.18 This is a comparison chart of the torque-current ratio of amorphous motor and silicon steel motor after the turning speed (5000rpm). Fig.17 and Fig.18 It can be seen that compared with silicon steel motors, due to the reduced iron content in amorphous alloy materials, the magnetic conductivity of amorphous alloy materials deteriorates, and the magnetic resistance torque of amorphous motors is relatively low, which limits the torque output of the motor, thereby reducing the efficiency of the amorphous motor using stator punching sheets 10 made of amorphous alloy materials.

[0111] Further, refer to Fig.19 , showing a magnetic flux distribution diagram of a motor, Fig.19 It is the magnetic flux distribution diagram of the motor obtained after finite element analysis of the motor. Fig.19 It can be concluded that the areas on the stator 1 of the motor that are prone to magnetic circuit saturation are the yoke 11 of the stator punching 10, the tooth 12 of the stator punching 10, and the narrow area between the first magnetic slot group 210 and the second magnetic slot group 211 on the rotor punching 20. It should be noted that medium and high load motors generally refer to motors with a load rate of 30% to 100%. Fig. 20 , shows the magnetization curve of an amorphous material, such as Fig. 20As shown, in order to solve the problem of magnetic circuit saturation at the above three positions, the hysteresis loop of the amorphous motor is divided into a linear magnetic circuit area and a nonlinear magnetic circuit area. Among them, the yoke 11 belongs to the linear magnetic circuit area, and its local magnetic flux density value is generally less than 1.4T, while the tooth 12 and the narrow area between the first magnetic slot group 210 and the second magnetic slot group 211 on the rotor punching 20 belong to the nonlinear magnetic circuit area, and its local saturation magnetic flux density is generally higher than 1.4T.

[0112] In practical applications, under the limitations of the motor stator size, pole pair number, etc., it is difficult to further adjust the flow length direction of the magnetic field. Therefore, for the yoke 11 of the stator punching sheet 10, the embodiment of the present application improves the problem of saturation suppression of amorphous motors by reasonably increasing the flow width of the yoke 11, that is, the width of the yoke 11 along the radial direction of the stator punching sheet 10, that is, the first length he. Specifically, when the first length he increases, the magnetic flux density decreases linearly and the magnetic resistance decreases rapidly, thereby effectively improving the problem of magnetic circuit saturation, which is beneficial to improving the output torque and motor efficiency of the motor. A stator slot 13 is formed between two adjacent teeth 12 of the stator punching sheet 10, and the stator slot 13 is used to install the armature winding. When the flow width of the tooth 12 is increased, that is, the width of the tooth along the circumference of the stator punching sheet 10, the installation space of the armature winding will be occupied, resulting in an increase in resistance. Therefore, for the tooth 12 of the stator punching sheet 10, the embodiment of the present application improves the problem of saturation suppression of the amorphous motor by reducing the flow length, that is, the length of the tooth 12 along the radial direction of the stator core 1, that is, the second length hc. Specifically, when the second length hc decreases, the magnetic flux density decreases linearly, and the magnetic resistance decreases rapidly, thereby effectively improving the problem of magnetic circuit saturation, which is conducive to improving the output torque and motor efficiency of the motor. However, excessively increasing the first length he and reducing the second length hc will cause the installation space of the armature winding to be too small, thereby causing the motor copper loss to increase, and the output torque and motor efficiency of the motor will decrease instead. Therefore, it is necessary to control the ratio of the first length he and the second length hc within a suitable range so that the motor has both high output torque and motor efficiency.

[0113] In the embodiment of the present application, since the stator sheet 10 includes a tooth portion 12 and a yoke portion 11, the radial length of the yoke portion 11 along the stator sheet 10 is a first length he, and the radial length of the tooth portion 12 along the stator sheet 10 is a second length hc, by making the ratio of the first length he to the second length hc satisfy the second preset range between 0.95 and 1.52, refer to Fig.21 , shows the iron loss distribution of a stator core 10 provided in an embodiment of the present application when the yoke tooth ratio is outside the second preset range, referring to Fig. 22 , shows the iron loss distribution of the tooth-yoke ratio of a stator core 10 provided in an embodiment of the present application within a second preset range, Fig. 22 and Fig.23By comparison, when the second preset range is outside the range of 0.95 to 1.52, the iron loss is more serious, and when the yoke gear ratio meets the range of 0.95 to 1.52, the iron loss is lighter, which can effectively improve the suppression of the motor output torque and motor efficiency caused by magnetic circuit saturation. Fig.23 , shows a comparison diagram of the ratio of the first length he to the second length hc of the stator core 10 according to an embodiment of the present application and the motor efficiency, see Fig.24 , shows an influence diagram of the yoke tooth ratio of a stator core 10 and the motor output torque provided in an embodiment of the present application, combined with Fig.23 and Fig.24 A comparative analysis is performed in the embodiment of the present application, and the second preset range can be 0.95~1.52. In the embodiment of the present application, the second preset range is between 0.95 and 1.52. The first length he and the second length hc are reasonably adjusted, which can improve the magnetic saturation degree of the yoke 11 and the tooth 12, and is beneficial to improving the problem of saturation suppression of the amorphous motor, so that the amorphous motor has a higher output torque and improves the efficiency of the amorphous motor.

[0114] Exemplarily, the yoke-to-tooth ratio may be 0.95, 1.15, 1.3, or 1.52. The specific value of the yoke-to-tooth ratio is not specifically limited in the embodiments of the present application.

[0115] Furthermore, the second preset range is 1.1 to 1.4.

[0116] In this embodiment, the yoke-tooth ratio can be between 1.15 and 1.3. When the yoke-tooth ratio is within the range of 1.15 to 1.3, the magnetic saturation degree of the teeth 12 and the yoke 11 on the stator core 10 of the amorphous material can be further improved, and the motor can have a higher output torque, and the efficiency of the motor can be further improved.

[0117] Optionally, the tooth portion 12 includes two side walls 121 disposed in opposite directions along the circumferential direction of the stator core 10 ; at least a portion of the tooth portion 12 is provided with an arc groove 122 at one end of the side wall 121 away from the yoke portion 11 .

[0118] Exemplarily, the method of setting arc grooves 122 in multiple tooth portions 12 may include: an arc groove 122 is set on each tooth portion 12, or, grooves are made every other number of teeth 12 from one to nine, or, uneven grooves are made every other number of teeth 12 from one to nine. The embodiment of the present application does not specifically limit the method of setting arc grooves 122 in multiple tooth portions 12.

[0119] like Fig.13 and Fig.14As shown, arc grooves 122 are provided on both side walls 121, and the arc grooves 122 are concave on the side walls 121 to form depressions. The arc grooves 122 are extended along the axial direction of the stator punching sheet 10, and the arc grooves 122 on the two side walls 121 are symmetrically provided on the tooth portions 12. In the embodiment of the present application, by providing arc grooves 122 on the two side walls 121, the spacing between two adjacent tooth portions 12 along the circumferential direction of the stator core 1 can be increased, thereby increasing the magnetic resistance of two adjacent tooth portions on the stator punching sheet 10 along the circumferential direction of the stator punching sheet 10, thereby reducing the magnetic field flowing between the two adjacent tooth portions 12, reducing leakage magnetic flux, thereby changing the magnetic circuit saturation position, and then changing the magnetic field torque pulsation and radial electromagnetic force, and improving the problem of magnetic circuit saturation suppressing the motor output torque and motor efficiency.

[0120] Optionally, the curvature of the arc-shaped groove 122 is 0.2-0.8.

[0121] Specifically, the curvature of the arc groove 122 is used to express the degree of curvature of the arc groove 122, which refers to the degree to which the curve deviates from the straight line at a certain point of the arc groove. The larger the curvature, the more severe the curvature of the arc groove, and the smaller the curvature, the more gentle the curvature of the arc groove 122. The curvature of the arc groove 122 is between 0.2 and 0.8. For example, the curvature of the arc groove 122 can be 0.2, 0.3, 0.4, 0.6, 0.8, etc. The embodiment of the present application does not specifically limit the specific value of the curvature.

[0122] In actual applications, if the curvature of the arc groove 122 is too large, the more severe the curvature of the arc groove 122 is, the larger the spacing between two adjacent teeth 12 along the circumferential direction of the stator core 1 will be, which will lead to increased magnetic leakage. If the curvature of the arc groove 122 is too small, the more gentle the curvature of the arc groove 122 is, the smaller the spacing between two adjacent teeth 12 along the circumferential direction of the stator core 1 will be, which will lead to local saturation of the stator core 10. When the curvature of the arc groove 122 is between 0.2 and 0.8, the path of the arc groove 122 on the side wall 121 to guide the magnetic field can be more accurately controlled, and the adjustment of the magnetic resistance can be further refined, so that the magnetic flux path can be further optimized, so that the copper loss of the amorphous motor is significantly reduced, which is beneficial to further improve the output performance and motor efficiency of the motor.

[0123] Optionally, the ratio of the maximum dimension of the arc-shaped slot 122 in the radial direction of the stator punching sheet 10 to the dimension of the tooth portion 12 and the stator punching sheet 10 in the radial direction is between 5% and 20%.

[0124] Specifically, the tooth portion 12 includes a tooth shoulder, which is arranged on a side of the tooth portion 12 away from the yoke portion 11 , and the arc-shaped groove is arranged on a side of the tooth shoulder along the circumferential direction of the stator punching sheet 10 .

[0125] In the embodiment of the present application, when the motor is running, especially when the frequency of the motor is over 500 Hz, the AC copper loss generated in the armature winding and the first two layers of windings corresponding to the tooth shoulder position gradually increases, reducing the efficiency of the motor. The AC copper loss generated by the two layers of windings can be reduced by increasing the radial dimension of the tooth shoulder along the stator punching sheet 10, but increasing the radial dimension of the tooth shoulder along the stator punching sheet 10 will lead to increased magnetic leakage, which will reduce the output torque of the motor. In order to increase the output torque of the motor and improve the efficiency problem caused by the increase of AC copper loss, an arc groove 122 can be added at the tooth shoulder. The arc groove 122 can reduce leakage magnetic field and improve the output torque and motor efficiency of the motor. However, when the ratio of the maximum size of the arc groove 122 in the stator punching sheet 10 to the radial size of the tooth portion 12 in the stator punching sheet 10 is greater than 20%, the radial size of the tooth shoulder in the stator punching sheet 10 is too large, which will cause the leakage magnetic field to be too high and the output torque loss of the motor to be too large. When the ratio of the maximum size of the arc groove 122 in the stator punching sheet 10 to the radial size of the tooth portion 12 and the stator punching sheet 10 is less than 5%, the radial size of the tooth shoulder in the stator punching sheet 10 is too small, which will cause the increase of AC copper loss and reduce the efficiency of the motor. Therefore, it is necessary to control the size of the arc slot 122 within a suitable range. In practical applications, when the ratio of the maximum size of the arc slot 122 in the radial direction of the stator core 1 to the size of the tooth portion 12 in the radial direction of the stator core 1 is between 5% and 20%, the circumferential magnetic resistance of the side wall 121 is fully increased to effectively suppress magnetic leakage, and excessive distortion of the magnetic circuit or weakening of the mechanical strength caused by the slot being too large is avoided, so that the amorphous motor can have both high output performance and motor efficiency. For example, the ratio of the maximum size of the stator punching sheet 10 in the radial direction to the size of the tooth portion 12 and the stator punching sheet 10 in the radial direction can be 5%, 7%, 10%, 12%, 16%, 20% or other values.

[0126] Optionally, a stator slot 13 is formed between two adjacent tooth portions 12 , and the length of the stator slot 13 along the radial direction of the stator core 10 is equal to the second length hc.

[0127] Specifically, a stator slot 13 is formed between two adjacent teeth 12, and the stator slot 13 is used to install the armature winding. In the embodiment of the present application, the optimization of the magnetic path is ensured by making the length of the stator slot 13 along the radial direction of the stator core 10 and the second length hc of the stator slot 13 along the radial direction of the stator core 10 equal. It is helpful to form a more balanced magnetic flux density between the stator teeth 12 and the yoke 11, reduce the change of magnetic resistance, and effectively alleviate the magnetic saturation phenomenon even when the motor is running under high load, improve the electromagnetic efficiency of the motor, and provide a more accurate installation space for the motor winding. In this way, it can not only ensure that the winding is arranged tightly and evenly, reduce the stray loss caused by the winding gap, but also improve the winding utilization rate, thereby reducing copper loss and enhancing the energy conversion efficiency of the motor.

[0128] Optionally, the second length hc satisfies a fifth preset range, and the fifth preset range is 15 mm to 20 mm.

[0129] Exemplarily, the second length hc can be 15mm, 16mm, 17mm, 20mm, etc. In practical applications, the second length hc is between 15mm and 20mm, which not only ensures sufficient space to reduce the risk of magnetic saturation, but also ensures the effective embedding of the winding, avoiding magnetic flux leakage or increased copper loss due to improper size. The copper loss can be controlled within a suitable range, which is beneficial to improving the output performance and motor efficiency of the amorphous motor. On the other hand, the contact area between the seal and the stator slot 13 can be increased, which is beneficial to improving the sealing effect of the stator slot 13.

[0130] Optionally, there are multiple stator cores 10; the multiple stator cores 10 are stacked axially, each stator core 10 includes a plurality of stator punching sheets stacked axially along the stator core 10, and each stator punching sheet includes at least two layers of amorphous alloy sheets stacked axially along the stator core 10.

[0131] Specifically, since the thickness of the amorphous alloy sheet is relatively small, at least two layers of amorphous alloy sheets are usually stacked together. When there are too many layers, the hardness of the amorphous strip is high, resulting in a short mold life. When there are too few layers, the thickness of the amorphous strip is thin, resulting in a long processing time. Optionally, the amorphous alloy sheet can be 2-10 layers, preferably, the amorphous alloy sheet can be 3-6 layers, each stator core 10 includes multiple layers of stator punchings, and each stator can include multiple stator cores 10. Optionally, each stator core 10 can include 100-300 stator punchings, and each stator can include 4-16 stator cores 10.

[0132] Optionally, a plurality of through holes 111 may be provided on the yoke 11 on a side away from the tooth portion 12. In actual applications, the through holes 111 allow coolant (such as cooling oil) to flow through the inside of the stator punching sheet 10, directly contact the heat source, take away the heat, and achieve efficient heat exchange, thereby ensuring that the motor can maintain a stable temperature during long-term, high-load operation, protecting the motor from thermal damage, extending its service life and maintaining an efficient operating state.

[0133] In actual applications, the stator 1 is formed by bonding a plurality of stator cores together, a stator core is formed by bonding a plurality of stator punching sheets 10 together, and a stator punching sheet 10 is formed by bonding a plurality of layers of first amorphous alloy sheets together, which may cause the stator to be prone to warping at both ends along the axial direction. Based on this, in some optional embodiments of the present application, the stator 1 also includes two cover plates 2, and the two cover plates 2 are connected to the two sides of the stator 1 along the axial direction. Specifically, the two cover plates 2 are pasted on both sides of the stator 1, and the cover plates 2 have the same teeth 12 and yoke 11 and through holes 111 as the stator 1, so as to facilitate the subsequent installation of the armature winding, and the cover plates 2 are made of metal materials, including but not limited to silicon steel and stainless steel. In this way, on the one hand, the warping phenomenon of the amorphous strip due to the low peeling strength can be improved, and on the other hand, the damage of the insulating paint film of the hairpin in the hairpin due to the high hardness of the amorphous strip during the stator assembly process can also be improved.

[0134] An embodiment of the present application also provides a power assembly, which includes the motor described in any of the above embodiments.

[0135] An embodiment of the present application further provides a vehicle, which may specifically include the motor described in any of the above embodiments or the motor described in any of the above embodiments.

[0136] It should be noted that in the embodiment of the present application, the structure of the motor is the same as the structure of the motor in any of the above embodiments, and its beneficial effects are also similar, which will not be elaborated here.

[0137] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0138] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A rotor punching, comprising a plurality of magnetic slot units arranged along the circumference of the rotor punching; The rotor punching sheet has an outer peripheral wall, and the outer peripheral wall includes a plurality of arc-shaped peripheral wall segments distributed in sequence along the circumference of the rotor punching sheet, and one of the arc-shaped peripheral wall segments corresponds to one of the magnetic slot units; Each of the magnetic slot units includes a first magnetic slot and a second magnetic slot arranged radially along the rotor punching sheet, and the ratio of the minimum spacing between the first magnetic slot and the second magnetic slot to the arc length of the arc-shaped circumferential wall segment in the circumferential direction of the rotor punching sheet is between 0.05 and 0.

08.

2. The rotor punching according to claim 1, characterized in that: The magnetic slot unit includes a first magnetic slot group and a second magnetic slot group, wherein the first magnetic slot group and the second magnetic slot group are distributed at intervals along the radial direction of the rotor punching, and the second magnetic slot group is close to the center of the rotor punching, wherein the magnetic slots arranged in the first magnetic slot group are the first magnetic slots, and there are at least two of the first magnetic slots, and the magnetic slots arranged in the second magnetic slot group are the second magnetic slots, and there are at least two of the second magnetic slots.

3. The rotor punching according to claim 2, characterized in that: The minimum distance between the first magnetic grooves and the second magnetic grooves that are close to each other in the first magnetic groove group and the second magnetic groove group is 1.5 mm to 15 mm.

4. The rotor punching according to claim 2, characterized in that: Two of the first magnetic slots in the first magnetic slot group are spaced apart in the circumferential direction of the rotor core, the first magnetic slot has a first center line extending in the radial direction of the rotor core, and a first angle is formed between the first center lines of the two first magnetic slots; two of the second magnetic slots in the second magnetic slot group are spaced apart in the circumferential direction of the rotor core, the second magnetic slot has a second center line extending in the radial direction of the rotor core, and a second angle is formed between the second center lines of the two second magnetic slots; The ratio of the first angle to the second angle is an angle ratio, and the angle ratio is 0.75 to 1.

9.

5. The rotor punching according to claim 4, characterized in that: The angle ratio is 1.03 to 1.

89.

6. The rotor punching according to claim 1, characterized in that: The rotor punching sheet is made of an amorphous alloy material, and the magnetic slot unit includes a plurality of magnetic slots, which are used to install permanent magnets; wherein the number of the magnetic slot units is a first number, the sum of the numbers of the magnetic slots in one magnetic slot unit is a second number, and the ratio of the first number to the second number satisfies a first preset range, and the first preset range is 0.66 to 7.

7. The rotor punching according to claim 6, characterized in that: The first preset range is 1-2.

8. A rotor core, characterized in that: The rotor core comprises: a plurality of rotor punching sheets according to any one of claims 1 to 7, wherein the plurality of rotor punching sheets are stacked along the axial direction of the rotor core, and each of the rotor punching sheets comprises at least two layers of amorphous alloy sheets stacked along the axial direction of the rotor core.

9. A rotor, characterized in that: The rotor comprises: a plurality of rotor cores according to claim 8, wherein the plurality of rotor cores are stacked in the axial direction.

10. A motor, characterized in that: The motor comprises: case; a stator, the stator being disposed in the housing; And the rotor as described in claim 9, wherein the rotor is disposed in the housing and connected to the stator.

11. The motor according to claim 10, characterized in that The stator comprises: A stator core made of an amorphous alloy material comprises a plurality of stator punching sheets stacked axially along the stator core, and each of the stator punching sheets comprises at least two layers of amorphous alloy sheets stacked axially along the stator core.

12. The motor according to claim 11, characterized in that The stator core is provided with a plurality of teeth and a yoke, wherein the plurality of teeth are spaced apart along the circumferential direction of the stator core, and the yoke is connected to a side of the plurality of teeth away from the center of the stator core; wherein the length of the yoke along the radial direction of the stator core is a first length, the length of the tooth along the radial direction of the stator core is a second length, and the ratio of the first length to the second length satisfies a second preset range, and the second preset range is 0.95 to 1.

52.

13. The motor according to claim 12, characterized in that The second preset range is 1.15 to 1.

3.

14. The motor according to claim 11, characterized in that: The tooth portion includes two side walls disposed in opposite directions along the circumferential direction of the stator core; At least part of the teeth is provided with an arc groove at one end of the side wall away from the yoke.

15. The motor according to claim 14, characterized in that The curvature of the arc groove is 0.2-0.

8.

16. The motor according to claim 14, characterized in that The ratio of the maximum dimension of the arc-shaped slot in the radial direction of the stator punching sheet to the dimension of the tooth portion in the radial direction of the stator punching sheet is between 5% and 20%.

17. The motor according to claim 12, characterized in that A stator slot is formed between two adjacent tooth portions, and the length of the stator slot along the radial direction of the stator core is equal to the second length.

18. The electric machine according to claim 17, characterized in that The second length is 15 mm to 20 mm.

19. A powertrain, characterized in that: The power assembly includes: the motor described in any one of claims 10-18 above.

20. A vehicle, characterized in that: It comprises the motor as described in any one of claims 10 to 18, or the powertrain as described in claim 19.

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