CN117895677A - Stator core and motor - Google Patents

Abstract

The invention relates to the field of motor stators, and provides a stator core and a motor. The first annular punching sheets are provided with a plurality of first oil cavity holes for overlapping to form a flow channel, and the first oil cavity holes are provided with a plurality of first oil cavity holes and penetrate along the axial direction of the first annular punching sheets; the second annular punching sheets are provided with a plurality of second oil cavity holes which are used for overlapping to form a flow channel, and the second oil cavity holes are provided with a plurality of second oil cavity holes and are communicated along the axial direction of the second annular punching sheets; the first annular punching sheet and the second annular punching sheet are overlapped along the axial direction, and the second oil cavity hole and the first oil cavity hole are arranged in a staggered manner along the circumferential direction and are partially communicated along the axial direction. The first oil cavity holes and the second runner holes are arranged in a staggered mode to form runners in zigzag distribution, so that the runners in zigzag distribution can better cover the circumference of the stator core, and therefore heat dissipation of the annularly distributed coils is guaranteed to be more uniform, and heat dissipation effect is improved.

Description

Stator core and motor

Technical Field

The invention relates to the field of motor stators, in particular to a stator core and a motor.

Background

The motor stator is generally formed by stacking stator core punched sheets, and then windings are arranged on the stator core punched sheets, so that a heat dissipation device is usually arranged on the motor because the motor stator generates a large amount of heat during the working process of the motor.

In the prior art, part of the motor is provided with an oil cooling device for heat dissipation, for example, a stator core punching sheet is punched, a runner is formed after superposition, two ends of the motor stator are provided with oil rings, the oil rings supply oil to the runner to finish cooling, however, the heat dissipation effect of a coil part corresponding to a stator core punching sheet area between the runners is poorer than that of a coil corresponding to the runner, that is, the heat dissipation is uneven in the circumferential direction of the motor stator, and local overheating is easy to occur.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an objective of the present invention is to provide a stator core and a motor for improving the heat dissipation effect of the motor.

To achieve the above and other related objects, the present invention provides a stator core comprising:

the first annular punching sheet is provided with a plurality of first oil cavity holes for overlapping to form a flow channel, and the first oil cavity holes are provided with a plurality of first oil cavity holes and are communicated along the axial direction of the first annular punching sheet;

the second annular punching sheets are provided with a plurality of second oil cavity holes for overlapping to form a flow channel, and the second oil cavity holes are provided with a plurality of second oil cavity holes and are communicated along the axial direction of the second annular punching sheets;

the first annular punching sheet and the second annular punching sheet are overlapped and arranged along the axial direction, and the second oil cavity hole and the first oil cavity hole are arranged in a staggered manner along the circumferential direction and are partially communicated along the axial direction.

In an alternative embodiment of the present invention, two circumferentially adjacent first oil chamber holes are partially communicated with the same second oil chamber hole in the axial direction.

In an alternative embodiment of the present invention, two circumferentially adjacent second oil chamber holes are partially communicated with the same first oil chamber hole in the axial direction.

In an alternative embodiment of the present invention, the first oil cavity hole and the second oil cavity hole are arc-shaped holes, and a curvature center of each arc-shaped hole is the same as an axis of the stator core.

In an alternative embodiment of the present invention, at least one oil cavity notch is formed on the first annular punch, and the oil cavity notch communicates with the periphery of the first annular punch and the first oil cavity hole.

In an alternative embodiment of the present invention, the first annular punching sheet is aligned and overlapped to form a first core unit, the second annular punching sheet is aligned and overlapped to form a second core unit, and the first core unit and the second core unit are staggered and overlapped along the axial direction.

In an alternative embodiment of the present invention, the number of the first core units is the number of the second core units minus one.

In an alternative embodiment of the present invention, the first core unit is provided with a plurality of oil cavity notches on adjacent first core units aligned in the circumferential direction of the first annular punching sheet.

In an optional embodiment of the present invention, a plurality of first core units are provided, and oil cavity notches on adjacent first core units are arranged in a staggered manner in a circumferential direction of the first annular punching sheet.

In an alternative embodiment of the present invention, the oil cavity indentations are arranged along a radial direction of the first annular punch.

In an alternative embodiment of the present invention, the outer circumference of the first annular punching sheet extends along a direction far away from the axis and is provided with a plurality of first connection parts, the first connection parts are provided with first through holes for the bolts to pass through, the outer circumference of the second annular punching sheet extends along a direction far away from the axis and is provided with a plurality of second connection parts, the second connection parts are provided with second through holes for the bolts to pass through, and the first through holes and the second through holes are aligned.

In an alternative embodiment of the present invention, the oil cavity gap communicates the first through hole and the first oil cavity hole.

The invention also provides a motor which comprises the stator core.

According to the stator core and the motor, the first oil cavity holes and the second runner holes are arranged in a staggered mode to form the runners which are distributed in a zigzag mode, so that the runners which are distributed in a zigzag mode can better cover the circumference of the stator core, the fact that the coils which are distributed in an annular mode are even in heat dissipation is guaranteed, and the even heat dissipation distribution is beneficial to improving the overall heat dissipation effect. This is critical to thermal management of the motor during long operation, and can extend the life and improve the performance of the motor.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a prior art stator;

fig. 2 is a schematic structural view of a first annular punching sheet of a stator core according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a second annular punching sheet of a stator core according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a stator core according to an embodiment of the present invention;

fig. 5 is a schematic view of a first annular punching sheet of a stator core according to another embodiment of the present invention;

fig. 6 is a schematic structural view of a second annular sheet of a stator core according to another embodiment of the present invention;

fig. 7 is a schematic structural view of a stator core according to another embodiment of the present invention.

Reference numerals illustrate: 1. a first core unit; 2. a second core unit; 10. a first annular die; 11. a first oil chamber hole; 12. an oil cavity notch; 13. a first connection portion; 14. a first through hole; 20. a second annular punching sheet; 21. a second oil chamber hole; 23. a second connecting portion; 24. and a second through hole.

Detailed Description

Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.

It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the illustrations, not according to the number, shape and size of the components in actual implementation, and the form, number and proportion of each component in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.

Stator cores are the primary structure of an electric machine, and are typically formed by stacking stator core laminations. The stacked structure of stator core laminations helps to reduce eddy current losses and improve magnetic flux conduction efficiency.

The stator core in the prior art is shown in fig. 1, and oil rings for oil supply are arranged at two ends of the stator core, and the stator core is formed by laminating stator core punching sheets of the same type along the axial direction. Wherein, the stator core is internally provided with flow passages which penetrate through the whole structure. They are arranged in parallel to ensure that the cooling oil flows uniformly through the entire stator core. In order to ensure enough structural strength, a certain interval is required between adjacent runners, and the heat dissipation effect of the coil part corresponding to the area is poorer than that of the coil corresponding to the runner, so that the stator core of the motor is difficult to uniformly dissipate heat. The temperature of the stator core is higher under the limit working condition, and the heat dissipation effect is poor, so that the local temperature of the stator core is easily too high, and the power and the service life of the motor are influenced.

The flow channels are considered redesigned to maximize the heat dissipation while maintaining sufficient structural strength. Possible optimizations include changing the shape, size, layout, etc. of the flow channels to ensure that the cooling oil flows more evenly through the entire stator core.

As shown in fig. 2, 3, 5 and 6, the present invention proposes a stator core including a first annular sheet 10 and a second annular sheet 20.

The axial direction, the radial direction and the circumferential direction in the application refer to the axial direction, the radial direction and the circumferential direction of the stator core.

The first annular punching sheet 10 is provided with a plurality of first oil cavity holes 11 for overlapping and forming a flow passage, and the first oil cavity holes 11 are provided with a plurality of first oil cavity holes and penetrate along the axial direction of the first annular punching sheet 10. The first annular punching sheet 10 is a stator core punching sheet, and a plurality of first oil cavity holes 11 on the first annular punching sheet 10 are combined together to form a plurality of mutually parallel flow passages, so that cooling oil can flow through the whole stator core along the axial direction. Such a design helps to ensure that the cooling oil is able to absorb heat effectively and carry away heat.

The second annular punching sheet 20 is provided with a plurality of second annular punching sheets 20, the second annular punching sheet 20 is a stator core punching sheet, the second annular punching sheet 20 is provided with second oil cavity holes 21 for overlapping to form a flow passage, and the second oil cavity holes 21 are provided with a plurality of second oil cavity holes and penetrate along the axial direction of the second annular punching sheet 20. The invention adopts two punching structures, and the shapes and the holes of the two punching structures are different.

The first annular punching sheet 10 and the second annular punching sheet 20 are overlapped and arranged along the axial direction, and the second oil cavity hole 21 and the first oil cavity hole 11 are arranged in a staggered manner along the circumferential direction and are partially communicated along the axial direction. The teeth and yokes on the first annular die 10 and the second annular die 20 are identical to and aligned with those of the stator core of the related art. The second oil chamber hole 21 is located at the same position in the radial direction as the first oil chamber hole 11.

The fact that the second oil chamber hole 21 and the first oil chamber hole 11 are arranged in a staggered manner in the circumferential direction means that the positions of the second oil chamber hole 21 and the first oil chamber hole 11 in the circumferential direction of the stator core are different, and a certain rotation angle difference exists. The meaning of the partial communication in the axial direction is that the projections of the first oil chamber hole 11 and the second oil chamber hole 21 on the axial end face of the stator core are partially overlapped.

The flow path formed by the second oil chamber hole 21 and the first oil chamber hole 11 thus becomes a flow path which varies in a meandering manner in the circumferential direction. The circumferential tortuous change of the runner can cover a large circumferential range, and the cooling oil is ensured to be uniformly distributed on the surface of the whole motor stator core. This helps to reduce cooling dead zones, i.e. areas of the stator core surface that are less susceptible to cooling. By covering a wider surface area, the cooling oil is able to effectively carry away the heat generated by the stator core. The tortuous flow passage design also can increase the contact time of the cooling oil with the surface, and improve the heat dissipation effect.

In an alternative embodiment of the present invention, two circumferentially adjacent first oil chamber holes 11 are partially communicated with the same second oil chamber hole 21 in the axial direction. Thus, two adjacent flow passages formed by the first oil chamber hole 11 are communicated with the flow passage formed by one second oil chamber hole 21, so that a cross flow passage is formed to enhance the cooling effect. The two first oil chamber holes 11 are symmetrically arranged with the axial communication area of the same second oil chamber hole 21, namely, the position of the second oil chamber hole 21 corresponds to the middle position between the two adjacent first oil chamber holes 11 in the circumferential direction. The area where the second oil cavity hole 21 is located can completely cover the area between the two first oil cavity holes 11, so as to ensure that the circumferential area between the two first oil cavity holes 11, through which the cooling liquid does not flow, flows through the cooling liquid at the corresponding flow passage position of the second oil cavity hole 21.

In an alternative embodiment of the present invention, two circumferentially adjacent second oil chamber holes 21 are partially communicated with the same first oil chamber hole 11 in the axial direction. Thus, two adjacent flow passages formed by the second oil chamber hole 21 are communicated with the flow passage formed by one first oil chamber hole 11 to form a cross flow passage. The two second oil chamber holes 21 are symmetrically arranged with the axial communication area of the same first oil chamber hole 11, namely, the position of the first oil chamber hole 11 corresponds to the middle position between the two circumferentially adjacent second oil chamber holes 21. The area where the first oil chamber hole 11 is located can completely cover the area between the two second oil chamber holes 21, so as to ensure that the circumferential area between the two second oil chamber holes 21, through which the cooling liquid does not flow, flows through the cooling liquid at the corresponding flow passage position of the first oil chamber hole 11.

In combination with the above embodiment, two ends of each flow passage formed by the first oil cavity hole 11 and the second oil cavity hole 21 are communicated with two flow passage sections, so that a net-shaped cross flow passage is formed, and communication of all flow passage sections is directly realized. The flow channels formed in the prior art are parallel linear flow channels, and obviously, the net-shaped cross flow channels formed by the invention can provide more uniform coverage in the circumferential direction of the stator core, so that the cooling liquid can be ensured to be contacted with the surface of the stator core more comprehensively. This helps to improve the overall heat dissipation effect. Meanwhile, the design of the cross flow channels can promote the fluid to be mixed between different flow channels, so that the convection effect of the fluid is improved, and the local medium is prevented from being overheated.

In an alternative embodiment of the present invention, the first oil cavity hole 11 and the second oil cavity hole 21 are arc-shaped holes, and the curvature center of the arc-shaped holes is the same as the axis of the stator core. The shape of the arc-shaped hole is consistent with that of the annular stator core, and the design is used for better adapting to the integral structure and the working principle of the motor. Meanwhile, the arrangement of the curvature center can ensure that the radial direction of the arc-shaped hole is basically the same as the winding distance, so that uniform flow channel distribution is realized, and uniform heat dissipation effect is ensured.

The radial dimension of the arc-shaped hole is narrower, the arc length direction of the arc-shaped hole is longer, the contact area between the cooling medium and the inner side of the flow channel is increased, the inner side of the flow channel is the side, close to the axis, of the flow channel, the inner side of the flow channel is a coil winding, the coil winding is a heating source, and the heat exchange area between the cooling medium and the coil winding can be increased by improving the contact area between the cooling medium and the inner side of the flow channel, so that the heat exchange capacity is improved.

The arc length of the arc-shaped holes is larger than the interval between the circumferentially adjacent arc-shaped holes, so that the two ends of the arc length direction of the arc-shaped holes can directly cross the part between the circumferentially adjacent arc-shaped holes and simultaneously communicate the two circumferentially adjacent arc-shaped holes. By ensuring that the arc length of the arc-shaped holes is large enough, gaps between adjacent holes can be directly spanned, and connectivity between the holes is improved. By designing to ensure adequate overlap between the arcuate holes, the risk of clogging or blockage may be reduced. Such a design may reduce the likelihood of dead space formation between the holes, thereby improving the stability and reliability of the system. The design can promote the fluid to flow more freely between the arc-shaped holes, reduce the resistance of the fluid to flow and improve the fluidity of the system.

As shown in fig. 2 and 5, the first annular punch 10 is provided with at least one oil cavity notch 12, and the oil cavity notch 12 communicates with the periphery of the first annular punch 10 and the first oil cavity hole 11. The oil cavity notch 12 can be opened in an electromagnetic non-influence area, so that the influence on electromagnetic performance is avoided.

The oil cavity notch 12 can be used as an oil inlet of a flow channel, so that oil supply devices at two ends of the stator core are omitted, the axial size of the stator core can be reduced, and the stator core is easier to install in a limited axial space due to the reduction of the axial size, so that the requirements of compact equipment such as hub motors and the like are met. Meanwhile, independent oil supply devices are not required to be designed at the two ends of the stator core, the integral structure is simplified, and the complexity of manufacturing and maintenance is reduced.

The oil cavity notch 12 can also be used as an oil outlet of a flow channel, and the flow channel can be additionally arranged between the stator core and the shell, so that certain heat dissipation can be completed within the peripheral range of the stator core.

As shown in fig. 4, the first annular punching sheet 10 is aligned and overlapped to form a first core unit 1, the second annular punching sheet 20 is aligned and overlapped to form a second core unit 2, and the first core unit 1 and the second core unit 2 are axially staggered and overlapped. Because the single stator core sheet is thinner, if the first annular sheet 10 and the second annular sheet 20 which are partially misplaced are directly overlapped, the misplaced parts during assembly can be caused to be partially deformed due to the existence of gaps. Therefore, the first annular punching sheet 10 with the same shape is stacked into the first iron core unit 1 with higher structural strength, the second annular punching sheet 20 is stacked into the second iron core unit 2, then the first iron core unit 1 and the second iron core unit 2 are stacked in a staggered manner, at the moment, the first iron core unit 1 and the second iron core unit 2 have certain structural strength, and then the first iron core unit 1 and the second iron core unit 2 are stacked in a staggered manner, so that problems caused by local dislocation, such as vacancies and deformation, in the assembly process can be reduced.

As shown in fig. 2, 3, 5 and 6, the overall structures of the first annular punch 10 and the second annular punch 20 are substantially the same, and the difference between them is that the first annular punch 10 has more oil cavity notches 12 than the second annular punch 20, and the positions of the first oil cavity holes 11 and the second oil cavity holes 21 on the first annular punch 10 and the second annular punch 20 are different, wherein the shapes of the first oil cavity holes 11 and the second oil cavity holes 21 are the same, so that the first annular punch 10 and the second annular punch 20 can be produced by adopting the following steps.

S1, stamping a stamping rough blank with a tooth part and a yoke part. In the stator structure of the motor, a tooth portion (tooth) and a yoke portion (yoke) are generally included. Stamping is a process whereby a material is plastically deformed or cut by applying pressure to the material to obtain a desired shape or configuration.

The tooth and the yoke play different roles in the stator core. As shown in fig. 2, 3, 5 and 6, the annular portion is a yoke portion of the stator lamination, and the annular inner ring protrudes inward to form a tooth portion. The teeth and yokes in this application are identical to those of the stator laminations in the prior art. These two parts play different roles in the stator core.

The teeth of the stator are protruding parts in the core, which are usually used for concentrating magnetic conduction and increasing the density of the magnetic field. The design of the teeth directly affects the performance of the motor, especially when rotating in the rotor, the magnetic field creates a magnetic potential gradient in the teeth, inducing an electrical current. This current interacts with conductors on the rotor to create electromagnetic forces that drive the rotor. Therefore, the design of the stator teeth critically affects the output power, efficiency and torque of the motor.

The yoke of the stator refers to the wider portion of the core connecting the teeth. The main function of the yoke is to provide a path of low reluctance to ensure that the magnetic field can flow smoothly through the entire stator. The well designed yoke is helpful to reduce magnetic leakage and improve the efficiency of the motor. The yoke also receives the magnetic flux of the stator, and thus needs to have sufficient magnetic permeability and mechanical strength.

S2, punching a first oil cavity hole 11 or a second oil cavity hole 21 or a first punching blank and a second punching blank on the yoke part of the punching rough blank. The stamping rough blank can be placed on a rotatable turntable, and a rotatable stamping die can be used, and the first oil cavity hole 11 and the second oil cavity hole 21 which are identical in shape and different in circumferential position can be stamped through a certain angle of die or turntable rotation, so that the manufacture of the first stamping blank and the second stamping blank can be completed on the same stamping station, and the radial dislocation or size difference of the first oil cavity hole 11 and the second oil cavity hole 21 caused by abrasion or assembly difference of different stamping equipment is avoided, so that the consistency of products is ensured.

For example: firstly, X first punching blanks are punched, then, a rotary table or a die is rotated to punch X second punching blanks, and the X first punching blanks are punched in a rotary mode again, so that the first punching blanks and the second punching blanks can be manufactured in sequence through circulation, and meanwhile, the machining sequence is the stacking sequence of the punching sheets on the formed stator core. Where X is the number of first annular laminations 10 in a single first core unit 1.

And S3, punching the first punching blank with the first oil cavity hole 11 to form an oil cavity notch 12. Because the oil cavity notch 12 on the first annular punching sheet 10 has no corresponding relation with the position of the second annular punching sheet 20, the first annular punching sheet can be processed by using independent punching equipment, and the consistency of products is not affected.

S4, the first annular punching sheet 10 and the second annular punching sheet 20 are respectively aligned and connected into a first iron core unit 1 and a second iron core unit 2 in a cementing mode, a welding mode and the like. Wherein the number of first annular punches 10 in the first core unit 1 is the same as the number of second annular punches 20 in the second core unit 2. This ensures that the first core unit 1 and the second core unit 2 have the same thickness to ensure that the lengths of the runner segments in the first core unit 1 and the second core unit 2 are the same. The same length of the runner section ensures that the cooling liquid is distributed more uniformly in the axial direction of the stator, so that the heat dissipation of the cooling liquid is more uniform.

S5, aligning the first iron core unit 1 and the tooth parts and the yoke parts of the first iron core unit 1, and overlapping in an axial staggered mode. Because the first iron core unit 1 and the rough blank of the first iron core unit 1 come from the same station on the same production line, the first iron core unit 1 and the first iron core unit 1 can realize the dislocation arrangement of the first oil cavity hole 11 and the second oil cavity hole 21 as long as being aligned, the time and the labor are saved during production and manufacturing, and meanwhile, the assembly precision is high, so that the production process is simplified, and the production efficiency is improved.

Since the blanks of the two core units are manufactured at the same station on the same production line, no additional adjustment or re-matching is required, and a plurality of possibly involved adjustment and calibration steps are omitted. This reduces the labor and time costs in the production process. Similar or identical initial features and common manufacturing sources may improve the accuracy of alignment and assembly between core units. This consistency helps ensure that the arrangement of the first and second oil chamber holes 11, 21 is consistent with design requirements, improving accuracy and consistency of assembly. Components from the same production line and station typically have less variability, reducing the risk of errors and mismatch in the assembly process.

As shown in fig. 4, the number of the first core units 1 is the number of the second core units 2 minus one. Since the first core units 1 and the second core units 2 are arranged in a staggered manner, the number of the first core units 1 and the second core units 2 ensures that the two ends of the stator core are both the second core units 2, and since the first core units 1 are provided with the oil cavity notches 12, the shape of the first core units is necessarily different from that of the stator core punching sheet in the prior art, when the oil rings or other structures in the prior art are installed at the two ends of the stator core, the first core units may not be adapted, and the shape of the second core units 2 may be the same as that of the stator core punching sheet in the prior art, so that the structures at the two ends of the stator core in the prior art can be directly adapted.

As shown in fig. 4, the first core unit 1 is provided with a plurality of oil cavity notches 12 on adjacent first core units 1 aligned in the circumferential direction of the first annular punch 10. The oil cavity notches 12 can be uniformly arranged at intervals in the circumferential direction of the first annular punching sheet 10, and the aligned oil cavity notches 12 can be used for oil inlet or oil outlet in the same direction, so that the arrangement of pipelines is facilitated.

In an alternative embodiment of the present invention, the first core unit 1 is provided with a plurality of oil cavity notches 12 on adjacent first core units 1 are arranged in a staggered manner in the circumferential direction of the first annular punching sheet 10. The staggered oil cavity notches 12 are beneficial to the oil inlet or oil outlet corresponding to the runner sections at different positions, and the oil inlet and oil outlet positions can ensure uniform heat dissipation due to different temperatures of the oil inlet and the oil outlet, and meanwhile, the distributed oil inlet or oil outlet can reduce or avoid the formation of flow dead angles, which can lead to stagnation of cooling medium in certain areas, so that the cooling effect is reduced. By a distributed design, the effect of such dead corners can be minimized, thereby preventing stagnation of the cooling medium in certain areas. By dispersing the locations of the oil inlet and outlet, it is ensured that heat is dissipated uniformly throughout the system. Such a design helps to achieve a uniform temperature distribution in the system, since the temperature of the incoming and outgoing oil may be different. Thereby improving the cooling effect of the whole system.

As shown in fig. 2 and 5, the oil cavity notch 12 is disposed along the radial direction of the first annular punch 10. The radial direction of the first annular punch 10 is the direction in which the first oil chamber hole 11 is closest to the outer periphery, and this arrangement facilitates rapid in-and-out of the cooling medium. And the shape of the oil cavity notch 12 is simpler, so that the production and the manufacturing are convenient.

As shown in fig. 5 and 6, the outer periphery of the first annular punching sheet 10 extends along a direction far away from the axis and is provided with a plurality of first connecting portions 13, the first connecting portions 13 are provided with first through holes 14 through which bolts pass, the outer periphery of the second annular punching sheet 20 extends along a direction far away from the axis and is provided with a plurality of second connecting portions 23, the second connecting portions 23 are provided with second through holes 24 through which bolts pass, and the first through holes 14 are aligned with the second through holes 24. The use of aligned through holes helps to simplify the assembly process, ensuring that the bolts can easily pass through and connect the first annular die 10 and the second annular die 20. Wherein the first connecting portion 13 and the second connecting portion 23 are each arranged in plural, specifically three or four, at regular intervals in the circumferential direction.

In the above-described aspect, the positioning of the first annular punch 10 and the second annular punch 20 in the circumferential direction can be ensured by inserting bolts through the aligned first through holes 14 and the second through holes 24, and the assembling process is simplified by ensuring the aligned arrangement of the first through holes 14 and the second through holes 24. And then the punching sheets can be stacked by axially pressing the punching sheets through locking the bolts, and the bolts can easily pass through the two annular punching sheets to ensure that the two annular punching sheets are correctly connected together. The even distribution of the first and second connection portions 13 and 23 helps to maintain the stability and uniformity of the connection.

As shown in fig. 5, the oil chamber notch 12 communicates the first through hole 14 with the first oil chamber hole 11. The first through hole 14 and the second through hole 24 are of a smooth hole structure, so that oil can be directly fed or discharged from a gap between a thread of a bolt and the through hole, and a hollow bolt can be used as a channel for feeding or discharging oil. No additional openings and no additional lines are required in the motor housing. This direct oil circuit design simplifies the cooling system, reduces the components and piping involved, and helps to improve the reliability of the system. The other mode is to adopt a hollow bolt as a channel, and oil is fed or discharged through the inside of the bolt. This design may further reduce the volume of the system. In addition, by avoiding additional openings and pipelines, the overall structure of the motor is more compact. This is necessary for applications where the volume requirements are high, such as in-wheel motors for automobiles. Meanwhile, the direct oil way design can simplify the maintenance and repair process. The method has the advantages that no additional pipeline is required to be disassembled, the operation is more convenient, and the maintenance cost and the maintenance time are reduced.

The invention also provides a motor which comprises the stator core. The motor includes a housing, which is an outer casing of the motor, typically used to protect the internal components. The stator core is arranged in the shell, the stator core is of the stator core structure in the embodiment, the windings are arranged on the stator core, and the cooling oil supply devices are arranged at the two axial ends or the circumferential direction of the stator core, and the stator core structure is specifically determined according to the embodiment adopting the stator core structure. Cooling ribs and air cooling means may be provided on the outside of the motor housing, the air cooling means typically comprising a fan or air duct for directing air across the outer surface of the motor to accelerate the cooling process. By creating an air flow around the motor, the air cooling device helps to carry heat away from the motor, providing an additional cooling effect.

In summary, the stator core and the motor provided by the invention have the advantages that the first oil cavity holes 11 and the second flow passage holes are arranged in a staggered manner to form the tortuous flow passages, so that the tortuous flow passages can better cover the circumference of the stator core, the more uniform heat dissipation of the annularly distributed coils is ensured, and the uniform heat dissipation distribution is beneficial to improving the overall heat dissipation effect. This is critical to thermal management of the motor during long operation, and can extend the life and improve the performance of the motor.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure. The high-pressure connection of the motor and the controller is effectively realized, the size is small, the oil-resistant sealing design is realized, the reliable sealing of the controller cavity and the motor cavity is realized, the oil cooling design of the stator core is realized, the temperature is effectively reduced, the through flow is larger, and the service life of a product is prolonged.

In the description herein, numerous specific details are provided, such as examples of components and/or methods, to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that an embodiment of the invention can be practiced without one or more of the specific details, or with other apparatus, systems, components, methods, components, materials, parts, and so forth. In other instances, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention.

Reference throughout this specification to "one embodiment," "an embodiment," or "a particular embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment, and not necessarily all embodiments, of the present invention. Thus, the appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any specific embodiment of the present invention may be combined in any suitable manner with one or more other embodiments. It will be appreciated that other variations and modifications of the embodiments of the invention described and illustrated herein are possible in light of the teachings herein and are to be considered as part of the spirit and scope of the invention.

It will also be appreciated that one or more of the elements shown in the figures may also be implemented in a more separated or integrated manner, or even removed because of inoperability in certain circumstances or provided because it may be useful depending on the particular application.

In addition, any labeled arrows in the drawings/figures should be considered only as exemplary, and not limiting, unless otherwise specifically indicated. Furthermore, the term "or" as used herein is generally intended to mean "and/or" unless specified otherwise. Combinations of parts or steps will also be considered as being noted where terminology is foreseen as rendering the ability to separate or combine is unclear.

As used in the description herein and throughout the claims that follow, unless otherwise indicated, "a", "an", and "the" include plural references. Also, as used in the description herein and throughout the claims that follow, unless otherwise indicated, the meaning of "in …" includes "in …" and "on …".

The above description of illustrated embodiments of the invention, including what is described in the abstract, is not intended to be exhaustive or to limit the invention to the precise forms disclosed herein. Although specific embodiments of, and examples for, the invention are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the present invention, as those skilled in the relevant art will recognize and appreciate. As noted, these modifications can be made to the present invention in light of the foregoing description of illustrated embodiments of the present invention and are to be included within the spirit and scope of the present invention.

The systems and methods have been described herein in general terms as being helpful in understanding the details of the present invention. Furthermore, various specific details have been set forth in order to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that an embodiment of the invention can be practiced without one or more of the specific details, or with other apparatus, systems, assemblies, methods, components, materials, parts, and/or the like. In other instances, well-known structures, materials, and/or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the invention.

Thus, although the invention has been described herein with reference to particular embodiments thereof, a latitude of modification, various changes and substitutions are intended in the foregoing disclosures, and it will be appreciated that in some instances some features of the invention will be employed without a corresponding use of other features without departing from the scope and spirit of the invention as set forth. Therefore, many modifications may be made to adapt a particular situation or material to the essential scope and spirit of the present invention. It is intended that the invention not be limited to the particular terms used in following claims and/or to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Accordingly, the scope of the invention should be determined only by the following claims.

Claims (13)

1. A stator core, comprising:

the first annular punching sheet is provided with a plurality of first oil cavity holes for overlapping to form a flow channel, and the first oil cavity holes are provided with a plurality of first oil cavity holes and are communicated along the axial direction of the first annular punching sheet;

the second annular punching sheets are provided with a plurality of second oil cavity holes for overlapping to form a flow channel, and the second oil cavity holes are provided with a plurality of second oil cavity holes and are communicated along the axial direction of the second annular punching sheets;

the first annular punching sheet and the second annular punching sheet are overlapped and arranged along the axial direction, and the second oil cavity hole and the first oil cavity hole are arranged in a staggered manner along the circumferential direction and are partially communicated along the axial direction.

2. The stator core of claim 1, wherein two circumferentially adjacent first oil chamber holes are in partial axial communication with the same second oil chamber hole.

3. The stator core of claim 2 wherein two circumferentially adjacent second oil chamber bores are in axial partial communication with the same first oil chamber bore.

4. The stator core of claim 1, wherein the first oil cavity hole and the second oil cavity hole are arc-shaped holes, and the curvature center of the arc-shaped holes is the same as the axis of the stator core.

5. The stator core of claim 1, wherein the first annular punch is provided with at least one oil cavity gap, and the oil cavity gap communicates with the outer periphery of the first annular punch and the first oil cavity hole.

6. The stator core of claim 5, wherein the first annular laminations are aligned and stacked to form a first core unit and the second annular laminations are aligned and stacked to form a second core unit, the first core unit and the second core unit being staggered and stacked in an axial direction.

7. The stator core of claim 6, wherein the number of first core units is the number of second core units minus one.

8. The stator core according to claim 6, wherein the first core unit is provided in plurality, and oil cavity notches on adjacent first core units are aligned in a circumferential direction of the first annular punch.

9. The stator core according to claim 6, wherein a plurality of first core units are provided, and oil cavity notches on adjacent first core units are arranged in a staggered manner in the circumferential direction of the first annular punching sheet.

10. The stator core of claim 5 wherein the oil pocket indentations are disposed radially of the first annular die.

11. The stator core according to claim 5, wherein the outer periphery of the first annular punching sheet is provided with a plurality of first connecting portions extending in a direction away from the axis, first through holes for bolts to pass through are formed in the first connecting portions, the outer periphery of the second annular punching sheet is provided with a plurality of second connecting portions extending in a direction away from the axis, second through holes for bolts to pass through are formed in the second connecting portions, and the first through holes are aligned with the second through holes.

12. The stator core of claim 11 wherein the oil pocket gap communicates between the first through bore and the first oil pocket bore.

13. An electric machine comprising a stator core as claimed in any one of claims 1-12.