Stator punching sheet and stator

Abstract

The utility model provides a stator punching sheet and a stator. The stator punching sheet comprises a body. The body is provided with a passing part and a flow guide part; the through part comprises a plurality of mounting grooves which are distributed at intervals in the circumferential direction of the body; at least part of the mounting groove has a first preset length in the radial direction of the body, and at least part of the mounting groove has a second preset length smaller than the first preset length in the radial direction of the body, so that the mounting groove with the second preset length forms a vacant area compared with the mounting groove with the first preset length; the flow guide part is arranged in the vacant area. Compared with an existing symmetrical structure with equal-length mounting grooves, the stator punching sheet is of an asymmetrical structure, the asymmetrical structure optimizes the inductance of a motor in the application process, the peak power is improved by about 15%, the efficient interval area of the motor is improved by 5%-10%, the sinusoidal property of a counter potential waveform is improved, and NVH is improved. In addition, the cooling effect of the motor stator is greatly improved, and higher current density can be supported, so that the performance is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobiles, in particular to a stator lamination and a stator. BACKGROUND

[0002] At present, with the rapid development of new energy vehicles, the requirements for small size and high power motors are increasingly high, which brings challenges to the heat dissipation and electromagnetic design of the motor.

[0003] For the electromagnetic design of the motor, the current stator slot type completely adopts a symmetrical structure, that is, the sizes of the slot bodies are all the same and the number of conductors in each slot body is completely the same. When a symmetrical three-phase current flows, a larger 6P order stator side magnetic motive force harmonic will be generated, and the power matching performance is poor.

[0004] In addition, for the heat dissipation of the motor, the water cooling or oil cooling mode is often used, specifically, a cooling oil hole is opened outside the stator core. However, since the highest heat density of the motor is concentrated in the stator winding position, the cooling effect is poor, and the peak power is bottlenecked due to temperature rise limitation.

[0005] Therefore, there is an urgent need for a stator lamination and a stator to solve the technical problems existing in the prior art to some extent. CONTENT OF THE UTILITY MODEL

[0006] The purpose of the present application is to provide a stator lamination and a stator to optimize the motor inductance, improve the motor high-efficiency area, and improve the cooling effect of the motor stator to some extent.

[0007] The present application provides a stator lamination, comprising a body;

[0008] The body has a through portion and a flow guide portion;

[0009] The through portion comprises a plurality of mounting grooves arranged at intervals along the circumferential direction of the body, and the plurality of mounting grooves extend along the radial direction of the body;

[0010] At least a first part of the mounting grooves has a first preset length along the radial direction of the body, and at least a second part of the mounting grooves has a second preset length smaller than the first preset length along the radial direction of the body, so that the mounting grooves with the second preset length form a vacancy area compared with the mounting grooves with the first preset length;

[0011] The flow guide portion is arranged in the vacancy area.

[0012] In the technical solution, further, the length of the mounting slot with the first preset length along the circumferential direction of the body is the same as the length of the mounting slot with the second preset length along the circumferential direction of the body.

[0013] In the technical solution, further, the two mounting slots with the first preset length form a mounting slot group.

[0014] The mounting slot with the second preset length is arranged between the two mounting slot groups.

[0015] In the technical solution, further, the flow guide part comprises a flow guide hole.

[0016] The flow guide hole is at least one.

[0017] When the flow guide hole is multiple, the multiple flow guide holes are arranged at intervals along the circumferential direction of the body.

[0018] In the technical solution, further, the flow guide hole is rectangular or elliptical.

[0019] In the technical solution, further, the number of the flow guide hole is arranged between 1 and 7.

[0020] In the technical solution, further, a through hole is further arranged on the body.

[0021] The through hole is arranged on the side of the body close to the center of the body, and the through hole is in communication with the part of the mounting slot close to the center of the body.

[0022] The application further provides a stator comprising the stator lamination, the skeleton and the flat wire.

[0023] The stator lamination is multiple, and the multiple stator laminations are laminated along the thickness direction to form a stator core.

[0024] The skeleton is sleeved outside the stator core.

[0025] The flat wire is multiple, and the multiple flat wires are arranged at intervals along the extending direction of the mounting slot.

[0026] In the technical solution, further, the mounting slot with the first preset length has a first number of the flat wires; the mounting slot with the second preset length has a second number of the flat wires less than the first number.

[0027] In the technical solution, further, the stator lamination is any one of 6-pole 54 mounting slot form, 6-pole 36 mounting slot form, 8-pole 48 mounting slot form, 8-pole 72 mounting slot form, 12-pole 72 mounting slot form, 12-pole 108 mounting slot form, and 16-pole 96 mounting slot form.

[0028] Compared with the prior art, the application has the following beneficial effects:

[0029] The application provides a stator lamination, comprising a body;

[0030] The body has a through portion and a flow guide portion;

[0031] The through portion comprises a plurality of mounting slots arranged at intervals in the circumferential direction of the body, and the plurality of mounting slots extend in the radial direction of the body.

[0032] At least a first portion of the mounting slots has a first preset length in the radial direction of the body, and at least a second portion of the mounting slots has a second preset length smaller than the first preset length in the radial direction of the body, so that the mounting slots with the second preset length form a vacancy area compared with the mounting slots with the first preset length.

[0033] The flow guide portion is arranged in the vacancy area.

[0034] In summary, the first mounting slot has a first preset length L1, and the second mounting slot has a first preset length L2. Since the first preset length L1 is greater than the first preset length L2, the first mounting slot and the second mounting slot are not equal in length. Compared with the existing equal-length mounting slot and symmetrical structure, the stator lamination of the application is an asymmetric structure, which has the following advantages in application: (1) the peak power of the structure of the application can reach 231.4km, while the peak power of the structure in the prior art can only reach 199.2km; that is, compared with the prior art, the application optimizes the motor inductance under the premise that other parameters such as motor size / material consumption are the same, and the peak power is increased by about 15%. (2) Compared with the prior art, the motor high-efficiency interval area of the application is increased by 5%-10%, which greatly increases the competitiveness of the product. (3) The structure of the application can optimize the 6P order magnetic resistance of the motor, and improve the sinusoidal nature of the back electromotive force waveform, that is, the back electromotive force waveform of the application tends to be a sine wave. (4) Compared with the prior art, the application reduces the proportion of 3rd harmonic order, 5th harmonic order, and 7th harmonic order, and improves the NVH (Noise, Vibration, Harshness) performance. (5) The cogging torque of the application is 0.1Nm, which is better than other products on the market.

[0035] In addition, the application is provided with a flow guide on the body, which can balance the magnetic resistance of the motor while conducting the cooling liquid, thereby reducing the temperature of the stator winding. Compared with the prior art of conducting the cooling liquid outside the stator core, at the same peak power point, the application has the following advantages: (1) the peak temperature of the stator winding is relatively reduced by about 30°C. (2) The temperature of the stator core of the structure of the application is 107.1°C, that is, the peak temperature of the stator core is relatively reduced by about 15°C. (3) The cooling effect of the motor stator is greatly improved, which can support higher electric density to improve performance.

[0036] The application also provides a stator comprising the stator lamination, the framework and the flat wire described above.

[0037] The stator lamination has a plurality of stator laminations stacked in the thickness direction to form a stator core; the framework is sleeved outside the stator core; the flat wire is provided with a plurality of flat wires arranged in the extension direction of the mounting groove.

[0038] In summary, since the application comprises the stator lamination described above, it also has all the beneficial effects of the stator lamination, which will not be described in detail here. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0040] Figure 1 Part of the structure of the stator lamination provided by the application is shown in the figure;

[0041] Figure 2 The output performance comparison curve provided by the application is shown in the figure;

[0042] Figure 3 The motor efficiency distribution of the application is shown in the figure;

[0043] Figure 4 The motor efficiency distribution of the prior art is shown in the figure;

[0044] Figure 5 The counter electromotive force comparison curve provided by the application is shown in the figure;

[0045] Figure 6 The counter electromotive force spectrum bar chart of the application is shown in the figure;

[0046] Figure 7 The counter electromotive force spectrum bar chart of the prior art is shown in the figure;

[0047] Figure 8 FIG. 1 is a tooth slot torque graph provided by the present application;

[0048] Figure 9 FIG. 2 is a tooth slot torque graph of the prior art;

[0049] Figure 10 FIG. 3 is a stator transient temperature profile comparison graph provided by the present application.

[0050] FIG. 1 is a tooth slot torque graph provided by the present application; DETAILED DESCRIPTION

[0051] The following detailed description is presented to aid in understanding the method, apparatus and / or system described herein. It is not intended to limit the method, apparatus and / or system described herein to the precise construction described. Rather, various changes, modifications, and equivalents can be resorted to as will be apparent to those skilled in the art. For example, the order of the operations can be changed, except insofar as such can materially effect the method, apparatus and / or system described. Additionally, features described herein can be omitted for the sake of brevity.

[0052] The features described herein can be implemented in different forms and should not be construed as limited to the examples described herein. Rather, these examples have been provided so that this disclosure will be thorough and complete, and will fully convey the scope of the methods, apparatus and / or systems described herein to those skilled in the art. Further, the description should not be construed to mean that the described embodiments are the only ones in which the methods, apparatus and / or systems described herein can be implemented.

[0053] Throughout the specification, when an element (such as a layer, region or substrate) is referred to as being "on" another element, "connected to" another element, "coupled to" another element, "adjacent to" another element, or "covering" another element, it can be directly on, connected, coupled, adjacent to or covering the other element or one or more other elements can be interposed therebetween. In contrast, when an element is referred to as being "directly on", "directly connected to", "directly coupled to", "directly adjacent to", or "directly covering" another element, there are no other elements interposed therebetween.

[0054] As used herein, the term "and / or" includes any and all combinations of one or more of the associated items.

[0055] Although terms such as "first" and "second" and "third" can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, terms of a first element, component, region, layer or section described herein could also be termed a second element, component, region, layer or section without departing from the teachings of the examples.

[0056] For ease of description, spatial relationship terms, such as "on", "upper", "under", and "lower", can be used herein to describe the relationship between one element and another element as shown in the drawings. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the drawings. For example, if the device in the drawings is turned over, an element described as on "upper" or "upper" relative to another element would then be oriented "under" or "lower" relative to the other element. Accordingly, the term "on" encompasses both an "on" and "under" orientation based on the spatial orientation of the device. The device can be oriented in other ways (e.g., rotated 90 degrees or at other orientations) and an appropriate re-interpretation of the spatial relationship terms used herein will be made.

[0057] The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and "has", "having" as used herein, are specifically intended to be construed as open-ended terms, i.e., to mean "including, but not limited to", "including, but not limited to", "including, but not limited to" and "including, but not limited to", respectively.

[0058] Variations in shapes depicted in the drawings can occur as a result of manufacturing processes and / or tolerances. Thus, the examples described herein are not limited to the specific shapes described herein but include variations in shapes that would occur as a result of manufacturing processes.

[0059] The features of the examples described herein can be combined in a variety of ways without departing from the teachings of the present disclosure. Furthermore, although exemplary examples have been described in some detail, other examples are possible and changes can be made without departing from the teachings of the present disclosure.

[0060] Embodiment One

[0061] The present application provides a stator lamination, comprising a body 3, the body 3 being annular; Figure 1Part of the body 3 is shown in the figure, in particular, Figure 1 In the figure, only one sixth of the body 3 is shown.

[0062] Specifically, the body 3 has a through portion 1 and a flow guiding portion 2, wherein the through portion 1 is used for passing through the flat wire, and the flow guiding portion 2 is used for guiding the cooling liquid.

[0063] Specifically, the through portion 1 includes a plurality of installation grooves, and the plurality of installation grooves are arranged in the circumferential direction of the body 3; in Figure 1 In the figure, the number of installation grooves in one sixth of the body 3 is 9, so for the whole body 3, there are 54 installation grooves; further, the installation grooves extend in the radial direction of the body 3.

[0064] Specifically, at least a first part of the installation grooves has a first preset length L1 in the radial direction of the body 3, and at least a second part of the installation grooves has a second preset length L2 smaller than the first preset length in the radial direction of the body 3; further, in combination Figure 1 As shown in the figure, the first part of the installation grooves is referred to as the first installation groove 4, and the first installation groove 4 has the first preset length L1. The second part of the installation grooves is referred to as the second installation groove 9, and the second installation groove 9 has the second preset length L2, that is, the first installation groove 4 is higher than the second installation groove 9.

[0065] Further, in combination Figure 1 As shown in the figure, in the actual use process, preferably, 7 flat wires are arranged in the first installation groove 4 with the first preset length, and 6 flat wires are arranged in the second installation groove 9 with the second preset length.

[0066] Specifically, in combination Figure 1 As shown in the figure, the installation grooves with the second preset length form a vacancy area 5 compared with the installation grooves with the first preset length. Further, since the first installation groove 4 is higher than the second installation groove 9, the second installation groove 9 will be shorter than the first installation groove 4 by a part, and this part is the vacancy area 5.

[0067] Specifically, the flow guiding portion 2 is arranged in the vacancy area 5, and the flow guiding portion 2 can guide the cooling liquid to cool the flat wire passing through the installation groove; since the flow guiding portion 2 is arranged on the body 3 and close to the flat wire, compared with the existing flow guiding portion 2 arranged on the outside of the body 3, the distance between the flow guiding portion 2 and the flat wire is shortened in the present application, and thus the heat exchange efficiency of the flat wire can be improved.

[0068] In summary, the first installation slot 4 has a first preset length L1, and the second installation slot 9 has a first preset length L2. Since the first preset length L1 is greater than the first preset length L2, the first installation slot 4 and the second installation slot 9 are not equal in length. Compared with the existing equal-length installation slot and symmetrical structure, the stator lamination of the application is an asymmetric structure, which has the following advantages in application:

[0069] (1) Combination Figure 2 ( Figure 2 The performance curve of the structure of the application and the symmetrical structure of the prior art is shown in the figure) shows that the peak torque of the application is 337.2 Nm, and the peak torque that can be generated by the structure of the prior art is 336.2 Nm. The peak power of the structure of the application can reach 231.4 km, while the peak power of the structure of the prior art can only reach 199.2 km. That is, compared with the prior art, the application optimizes the motor inductance under the premise that the motor size / material consumption and other parameters are the same, and the peak power is increased by about 15%.

[0070] (2) Combination Figure 3 ( Figure 3 The motor efficiency distribution of the application is shown in the figure) and Figure 4 ( Figure 4 The motor efficiency distribution of the prior art is shown in the figure) shows that, with the structure of the application, the area of the 85% efficient region is 92.3%, the area of the 90% efficient region is 83.7%, and the area of the 95% efficient region is 41.0%. With the structure of the prior art, the area of the 85% efficient region is 91.0%, the area of the 90% efficient region is 80.8%, and the area of the 95% efficient region is 37.9%. That is, compared with the prior art, the application increases the area of the motor efficient region by 5%-10%, greatly increasing the competitiveness of the product.

[0071] (3) Combination Figure 5 ( Figure 5 The back electromotive force comparison curve obtained by using the structure of the application and the structure of the prior art is shown in the figure) shows that the structure of the application can optimize the 6P order reluctance of the motor and improve the sinusoidal nature of the back electromotive force waveform, that is, the back electromotive force waveform of the application tends to be a sine wave.

[0072] (4) Combination Figure 6 ( Figure 6 The bar chart of the back electromotive force spectrum of the application is shown in the figure) and Figure 7 ( Figure 7As shown in the reverse electromotive force spectrum bar chart of the prior art, it can be seen that, compared with the prior art, the application reduces the proportion of 3rd, 5th and 7th harmonic orders, and improves the NVH (Noise, Vibration, Harshness) performance.

[0073] (5) Combination Figure 8 ( Figure 8 As shown in the cogging torque line chart of the application and Figure 9 ( Figure 9 As shown in the cogging torque line chart of the prior art, the cogging torque of the application is 0.1 Nm, which is better than other products on the market.

[0074] In addition, the application is provided with a flow guide part 2 on the body 3, which can balance the motor magnetic resistance while conducting the coolant, reduce the temperature of the stator winding, and has the following advantages compared with the prior art of conducting the coolant outside the stator core at the same peak power point:

[0075] (1) Combination Figure 10 As shown, the stator winding temperature of the prior structure is 156.0℃, and the stator winding temperature of the structure of the application is 124.5℃, i.e. the peak temperature of the stator winding is relatively reduced by about 30℃.

[0076] (2) Combination Figure 10 As shown, the stator core temperature of the prior structure is 121.3℃, and the stator core temperature of the structure of the application is 107.1℃, i.e. the peak temperature of the stator core is relatively reduced by about 15℃.

[0077] (3) Greatly improve the cooling effect of the motor stator, which can support higher electric density to improve performance.

[0078] In this embodiment, the length of the mounting groove with the first preset length along the circumferential direction of the body 3 is the same as the length of the mounting groove with the second preset length along the circumferential direction of the body 3.

[0079] Specifically, as shown in Figure 1 As shown, the mounting groove is a rectangular structure, the length of the mounting groove is the radial direction of the body 3, and the width of the mounting groove is the circumferential direction of the body 3. Then the length of the mounting groove is not equal, and the width of the mounting groove is the same; that is, the application defines the number of flat wires mounted in the mounting groove by the unequal length of the mounting groove, so as to change the performance of the stator lamination.

[0080] In this embodiment, as shown in Figure 1As shown, two first installation grooves 4 with the first preset length form an installation groove group 6; a second installation groove 9 with the second preset length is arranged between adjacent installation groove groups 6, so that the installation groove group 6 and the second installation groove 9 are staggered along the circumferential direction of the body 3, thereby improving the peak power, increasing the motor high-efficiency interval area, improving the sine property of the back electromotive force waveform, reducing the 3 / 5 / 7 harmonic order ratio, and the like.

[0081] In this embodiment, the body 3 is provided with a plurality of installation grooves. Figure 1 As shown, the flow guide part 2 comprises a flow guide hole 7; the flow guide hole 7 is at least one; when the flow guide hole 7 is multiple, the multiple flow guide holes 7 are arranged in the circumferential direction of the body 3.

[0082] Specifically, the flow guide hole 7 is rectangular or elliptical.

[0083] Specifically, the number of flow guide holes 7 is set to be between 1-7. In combination with Figure 1 As shown, preferably, the flow guide hole 7 is 5, and the flow guide hole 7 is arranged in the circumferential direction of the body 3.

[0084] In this embodiment, the body 3 is provided with a plurality of installation grooves. Figure 1 As shown, the body 3 is further provided with a through hole 8; the through hole 8 is arranged on the side of the body 3 close to the center thereof, and the through hole 8 is in communication with the part of the installation groove close to the center of the body 3.

[0085] Specifically, each installation groove has a corresponding through hole 8, and the flat wire can be placed in the installation groove through the through hole 8.

[0086] Embodiment Two

[0087] In this embodiment, a stator is provided, which comprises the above-mentioned stator lamination, skeleton and flat wire.

[0088] Specifically, the stator lamination has a plurality, and the plurality of stator laminations are laminated in the thickness direction to form a stator core, that is, a plurality of stator laminations are stacked together to form a stator core.

[0089] Specifically, the skeleton is sleeved outside the stator core; the flat wire is provided with a plurality, and the plurality of flat wires are arranged in the extension direction of the installation groove.

[0090] In this embodiment, the installation groove with the first preset length has a first number of flat wires; the installation groove with the second preset length has a second number of flat wires less than the first number.

[0091] In combination with Figure 1 As shown, preferably, the first number is 7, that is, the first installation groove 4 is provided with 7 flat wires; the second number is 6, that is, the second installation groove 9 is provided with 6 flat wires.

[0092] It is worth noting that: the above can be understood as the application is a 6x7 flat wire form, but also for 4x5 flat wire form, 5x6 flat wire form, 7x8 flat wire form, 8x9 flat wire form, 9x10 flat wire form.

[0093] In this embodiment, the stator lamination is any one of 6-pole 54 mounting slot form, 6-pole 36 mounting slot form, 8-pole 48 mounting slot form, 8-pole 72 mounting slot form, 12-pole 72 mounting slot form, 12-pole 108 mounting slot form, 16-pole 96 mounting slot form.

[0094] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A stator lamination characterized by, The body comprises a through portion and a flow guide portion; The through portion comprises a plurality of mounting slots arranged along the circumferential direction of the body, and the plurality of mounting slots extend along the radial direction of the body; At least a first portion of the mounting slots has a first preset length along the radial direction of the body, and at least a second portion of the mounting slots has a second preset length smaller than the first preset length along the radial direction of the body, so that the mounting slots with the second preset length form a vacancy area compared with the mounting slots with the first preset length; The flow guide portion is arranged in the vacancy area. The length of the mounting slots with the first preset length along the circumferential direction of the body is the same as the length of the mounting slots with the second preset length along the circumferential direction of the body.

2. The stator lamination of claim 1, wherein, Two mounting slots with the first preset length form a mounting slot group; 3. The stator lamination of claim 1, wherein, The mounting slots with the second preset length are arranged between adjacent mounting slot groups. The flow guide portion comprises a flow guide hole; 4. The stator lamination of claim 1, wherein, The flow guide hole is at least one; When there are a plurality of flow guide holes, the plurality of flow guide holes are arranged along the circumferential direction of the body. The flow guide hole is rectangular or elliptical.

5. A stator lamination according to claim 4, characterised in that The number of flow guide holes is between 1 and 7.

6. The stator lamination of claim 4, wherein, The body further comprises a through hole; 7. The stator lamination of claim 1, wherein, The through hole is arranged on the side of the body close to the center of the body, and the through hole is in communication with the part of the mounting slots close to the center of the body. The stator lamination, the skeleton, and the flat wire of any one of claims 1-7 are included; 8. A stator characterized by, The stator lamination has a plurality of stator laminations, and the plurality of stator laminations are stacked along the thickness direction to form a stator core; The skeleton is arranged outside the stator core; The flat wire has a plurality of flat wires, and the plurality of flat wires are arranged along the extension direction of the mounting slots. The mounting slots with the first preset length have a first number of flat wires, and the mounting slots with the second preset length have a second number of flat wires less than the first number.

9. A stator according to claim 8, characterised in that The stator lamination is any one of 6-pole 54 mounting slot form, 6-pole 36 mounting slot form, 8-pole 48 mounting slot form, 8-pole 72 mounting slot form, 12-pole 72 mounting slot form, 12-pole 108 mounting slot form, and 16-pole 96 mounting slot form.

10. The stator of claim 8, wherein ​

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