Stator core, stator and motor

Abstract

This invention provides a stator core, a stator, and a motor. The stator core includes: multiple laminations; the multiple laminations are stacked, and each lamination has at least two bosses spaced apart on its outer circumference; each boss has a bolt hole; a lamination at one end is defined as a first lamination; a lamination at the other end is defined as a second lamination; an oil guide cover is provided on the end face of the first lamination away from the second lamination, and on the end face of the second lamination away from the first lamination, and the first lamination has an oil inlet hole; both the second lamination and the first lamination also have a first oil groove; the first oil groove is electrically connected to the oil guide cover; multiple second oil grooves are spaced apart along the circumferential direction on the laminations between the first and second laminations; the oil guide cover has a spray nozzle. This invention can improve the internal space utilization of the motor, make the stator cooling efficiency higher and the performance more stable, and effectively reduce the size and weight of the motor.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicles, to drive motors, and particularly to motor cooling, specifically a stator core, a stator, and a motor. Background Technology

[0002] With the rapid upgrading of the new energy vehicle industry, oil-cooled motors are increasingly widely used in high-power, high-load, and high-temperature environments. However, insufficient stator cooling can significantly affect motor performance and lifespan. As a key component, the iron core has the potential to integrate assembly and cooling functions. This innovative design not only fully utilizes the excellent thermal conductivity and lubrication properties of cooling oil, significantly improving the motor's heat dissipation efficiency, but also effectively reduces the motor's size and weight, lowers noise and vibration, thereby improving overall operating performance and achieving cost reduction and efficiency improvement. Furthermore, the integration of the oil cooling system enhances the motor's operational stability under high temperature, high load, and harsh environments, extending its service life. The oil-cooled iron core provides a new solution for the motor industry, meeting the urgent needs of the new energy vehicle industry for efficient, reliable, and low-cost motors.

[0003] However, in an oil-cooled environment, the motor cooling system has many components, complex assembly, unstable cooling performance, low utilization of internal space, and large external dimensions. Summary of the Invention

[0004] The purpose of this invention is to provide a stator core, a stator, and a motor to solve the problems mentioned in the background art.

[0005] In a first aspect, the present invention provides a stator core for assembly with a housing by bolts. The stator core includes: a plurality of laminations; the plurality of laminations are stacked, and at least two bosses are spaced apart on the outer circumference of each lamination; each boss is provided with a bolt hole; the bolt hole is used to house the bolt; a lamination at one end is defined as a first lamination; a lamination at the other end is defined as a second lamination; an oil guide cover is provided on the end face of the first lamination away from the second lamination, and on the end face of the second lamination away from the first lamination, and an oil inlet hole is provided on the first lamination. The oil inlet is used to connect with the oil outlet on the housing; both the second iron chip and the first iron chip are provided with a first oil groove; the first oil groove is connected with the oil inlet of the oil guide cover; the laminations between the first iron chip and the second iron chip are provided with a plurality of second oil grooves at intervals along the circumferential direction; the second oil groove is used to form an internal oil passage; the internal oil passage is also connected with the oil inlet and the first oil groove respectively; the oil guide cover is provided with a spray nozzle; the cooling oil flows into the internal oil passage along the oil inlet, then flows out from the first oil groove to the oil guide cover, and finally flows out from the spray nozzle.

[0006] This invention provides an oil-cooling structure design suitable for bolt-fixed stator cores. This design allows the stator core to form an oil passage after assembly with the housing, eliminating the need for separate oil pipes and other components, thereby improving the internal space utilization of the motor. By slotting the laminations (including a first oil groove and a second oil groove) and stacking them to form the oil passage of the stator core (the flow sequence of cooling oil in the stator core's oil passage is: oil inlet → internal oil passage → first oil groove → oil guide cover → spray nozzle), the cooling oil can circulate inside the stator core, resulting in higher stator cooling efficiency and more stable performance. In addition, this structural design integrates the oil cooling system inside the stator core (and housing), effectively reducing the size and weight of the motor.

[0007] In one implementation of the first aspect, the laminations between the first iron chip and the second iron chip form an iron chip group; the iron chip group includes at least one third iron chip and at least one fourth iron chip; the number of the third iron chip and the fourth iron chip are equal, and the third iron chip and the fourth iron chip are arranged alternately, and the second oil groove on the third iron chip is electrically connected to the second oil groove on the fourth iron chip to form the internal oil circuit.

[0008] In one implementation of the first aspect, the number of second oil grooves on the third iron chip is equal to the number of second oil grooves on the fourth iron chip, and there is an angle between the second oil grooves on the third iron chip and the second oil grooves on the fourth iron chip, and the second oil grooves on the third iron chip and the second oil grooves on the fourth iron chip are evenly spaced.

[0009] In this implementation, by creating an angle between the second oil groove on the third iron chip and the second oil groove on the fourth iron chip, the oil grooves between different iron chips can be misaligned, thereby enabling the cooling oil to flow fully through the stator core and thus improving the cooling effect.

[0010] In one implementation of the first aspect, the included angle is 180 / n; where n represents the total number of second oil grooves on the third iron chip.

[0011] In one implementation of the first aspect, the distance between two adjacent second oil tanks is less than the length of the second oil tank along the circumferential direction.

[0012] In this implementation, by making the distance between two adjacent second oil grooves on the same iron chip (the third iron chip or the fourth iron chip) smaller than the length of the second oil groove along the circumferential direction, the solid part between two adjacent second oil grooves on the same iron chip is prevented from blocking the second oil grooves on adjacent iron chips when the second oil grooves on the third iron chip are misaligned with the second oil grooves on the fourth iron chip, thereby ensuring the smooth flow of cooling oil inside the stator core.

[0013] In one implementation of the first aspect, the size of the first oil tank is larger than the size of the second oil tank.

[0014] In this implementation, by making the size of the first oil tank larger than the size of the second oil tank, it is possible to ensure smooth oil inlet and outlet.

[0015] In one implementation of the first aspect, the oil inlet is directly opposite a second oil groove on the target stamping; the target stamping is a stamping adjacent to the first iron chip.

[0016] In this implementation, by designing the oil inlet hole to face a second oil groove on the target lamination, the flow resistance of the stator core oil passage at the inlet is reduced.

[0017] In one implementation of the first aspect, the number of first oil grooves on the second iron chip and the number of first oil grooves on the first iron chip are both two, and the two first oil grooves on the second iron chip and the two first oil grooves on the first iron chip are symmetrically distributed on both sides of the neutral plane; wherein, the neutral plane is a plane formed by the coplanarity of the central axis of the stator core and the central axis of the oil inlet hole.

[0018] In this implementation, two first oil grooves are provided on both the second iron chip and the first iron chip, and the two first oil grooves on each iron chip are symmetrically distributed on both sides of the neutral plane to ensure the symmetry of the cooling oil when it is sprayed out from the oil guide cover, and to prevent the cooling oil from spraying out to one side, thereby ensuring the reliability of the cooling of the stator winding and further ensuring the cooling effect.

[0019] In one implementation of the first aspect, the oil inlet is located at the lowest point in the direction of gravity.

[0020] In this implementation, by placing the oil inlet at the lowest point in the direction of gravity, the first oil groove on the corresponding second iron chip and the first oil groove on the first iron chip are basically at the highest point in the direction of gravity (without considering the shell). This can prevent dead zones from existing inside the oil passage of the stator core and further ensure that the cooling oil flows fully through the oil passage of the stator core.

[0021] In one implementation of the first aspect, the oil guide cover has an overall arc-shaped structure, and includes two sealing plates, two oil collecting cavities, and three mounting plates; wherein the oil collecting cavities are spaced apart from the mounting plates, and each oil collecting cavity is located between two mounting plates, and a sealing plate is provided on one side of each oil collecting cavity; the number of oil inlets is two, with two oil inlets respectively located on the other side of the two oil collecting cavities, and one oil inlet is connected to a first oil groove on the first iron chip or the second iron chip; the number of spray nozzles is at least two, with at least two spray nozzles divided into two spray groups; one spray group is correspondingly located on one oil collecting cavity, and one spray group includes at least one spray nozzle; the mounting plate is connected to the first iron chip or the second iron chip.

[0022] In this implementation, a novel oil guide cover structure is provided, which includes two oil collection chambers. These two oil collection chambers are also symmetrically distributed about the neutral plane to ensure the symmetry of the cooling oil sprayed from the spray nozzles on the oil collection chambers.

[0023] In one implementation of the first aspect, the size of the oil inlet is greater than or equal to the size of the first oil tank.

[0024] In this implementation, the oil outlet flow resistance is reduced by making the size of the oil inlet greater than or equal to the size of the first oil tank.

[0025] In one implementation of the first aspect, there are multiple spray nozzles, and each spray nozzle is provided with a baffle on the same side.

[0026] In this implementation, a baffle is designed on one side of the spray nozzle to prevent oil columns from different spray nozzles from colliding or interfering when the outlet flow rate of the spray nozzle is high, and to guide and isolate different oil outlet channels when the outlet flow rate of the spray nozzle is low, preventing the oil flowing out of the spray nozzle from all converging on one side.

[0027] In one implementation of the first aspect, a plurality of the spray nozzles are evenly arranged on the oil guide cover.

[0028] In this implementation, by evenly distributing multiple spray nozzles, the uniformity of the cooling oil sprayed from the nozzles is ensured, avoiding situations where the cooling oil is relatively concentrated in some places and relatively dispersed in others, thereby ensuring the cooling effect on the stator winding.

[0029] In a second aspect, the present invention provides a stator, the stator comprising: a stator winding and the aforementioned stator core; the stator winding is assembled with the core slots of the stator core.

[0030] Thirdly, the present invention provides an electric motor, the electric motor comprising: a housing and the aforementioned stator; wherein, the housing is provided with a plurality of threaded holes; one of the threaded holes corresponds to a bolt hole in the stator core of the stator; the stator and the housing are assembled by means of bolts passing through the bolt hole and the threaded hole; the housing is further provided with an oil inlet and an oil outlet; the oil outlet is respectively connected to the oil inlet and the oil inlet of the stator core.

[0031] In this invention, the oil outlet is connected to the oil inlet to form the oil passage of the housing; the oil outlet is then connected to the oil inlet to achieve the oil passage connection between the housing and the stator core. This structural design eliminates the need for external oil pipes in the circumferential direction of the stator, resulting in a high degree of integration. This effectively reduces the weight and volume of the motor while improving the utilization rate of the internal space.

[0032] In one implementation of the third aspect, a gap is left between the outer circular surface of the stator core and the inner circular surface of the housing.

[0033] In this implementation, by leaving a gap between the outer circular surface of the stator core and the inner circular surface of the housing, interference between the oil guide cover and the housing is effectively prevented.

[0034] In one implementation of the third aspect, the oil outlet hole is coaxially aligned with the oil inlet hole, and the size of the oil outlet hole is smaller than the size of the oil inlet hole.

[0035] In this implementation, by aligning the oil outlet hole and the oil inlet hole coaxially and making the size of the oil outlet hole smaller than the size of the oil inlet hole, the smooth flow of oil from the housing to the stator core is ensured.

[0036] As described above, the stator core, stator, and motor of the present invention have the following beneficial effects:

[0037] (1) Compared with the prior art, the stator core, stator and motor provided by the present invention have improved cooling efficiency: the utilization rate of cooling oil is improved, the thermal conductivity can be fully utilized, and the heat dissipation capacity of the motor under high power and high load is significantly improved, thereby improving the motor performance and service life.

[0038] (2) Structural design optimization: After the stator and housing are assembled, an oil circuit is formed, eliminating the need for separate oil pipes and other parts. The integration is high, effectively reducing the weight and volume of the motor.

[0039] (3) High manufacturability: Iron core laminations can be formed by stamping. Different types of laminations can be stacked together to form oil circuits. Bolt installation can make the oil circuits between the iron core and the shell fit tightly and realize the connection of the oil circuits. Attached Figure Description

[0040] Figure 1 The diagram shown is a structural schematic of the stator core according to an embodiment of the present invention.

[0041] Figure 2 The image shown is a front view of the stator core according to an embodiment of the present invention.

[0042] Figure 3 The diagram shows the structure of the first iron chip, the second iron chip, the third iron chip, and the fourth iron chip as described in an embodiment of the present invention.

[0043] Figure 4A The diagram shown is an assembly diagram of the stator core and housing according to an embodiment of the present invention.

[0044] Figure 4B The diagram shown is a disassembly and assembly diagram of the stator core and housing according to an embodiment of the present invention.

[0045] Figure 5 The image shown is a top view of the housing as described in an embodiment of the present invention.

[0046] Figure 6 Displayed as Figure 4A A sectional view.

[0047] Figure 7A Displayed as Figure 4A Top view.

[0048] Figure 7B The diagram shown is a schematic representation of the neutral surface as described in an embodiment of the present invention.

[0049] Figure 7C The image shown is a half-sectional view of the neutral plane as described in an embodiment of the present invention.

[0050] Figure 8A The diagram shown is a structural schematic of the oil guide cover according to an embodiment of the present invention.

[0051] Figure 8B The diagram shown is a structural schematic of the oil inlet according to an embodiment of the present invention.

[0052] Figure 8C The diagram shown is a structural schematic of the oil collecting cavity according to an embodiment of the present invention.

[0053] Figure 9A The diagram shows the flow direction of the oil circuit in the stator core according to an embodiment of the present invention.

[0054] Figure 9B The diagram shows the flow direction of the internal oil circuit as described in an embodiment of the present invention. Detailed Implementation

[0055] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0056] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0057] See Figure 1 To Figure 9. The following embodiments of the present invention provide a stator core, a stator, and a motor. Compared with the prior art, the stator core, stator, and motor provided by the present invention have improved cooling efficiency: the utilization rate of cooling oil is improved, which can give full play to the thermal conductivity and significantly improve the heat dissipation capacity of the motor under high power and high load, thereby improving the motor performance and service life; the structural design is optimized: the stator and the housing form an oil circuit after assembly, eliminating the need for separate oil pipes and other parts, resulting in a high degree of integration and effectively reducing the weight and volume of the motor; the manufacturability is high: the core laminations can be formed by stamping, and different types of laminations can be stacked together to form an oil circuit. Bolt installation can ensure that the oil circuit between the core and the housing is tightly fitted, realizing the connection of the oil circuit.

[0058] The technical solutions of the present invention will now be described in detail with reference to the accompanying drawings.

[0059] It should be noted that, Figure 7A The view shown is a partial front view of the motor structure under normal operating conditions. For ease of description and analysis, the stator core 1 is used as an example. Figure 1 The orientation will be used to explain.

[0060] like Figure 1As shown in Figure 9, in one embodiment, the present invention provides a stator core 1, which is used to be assembled with a housing 3 by bolts 2. The stator core 1 includes: a plurality of laminations; the plurality of laminations are stacked, and each lamination has at least two protrusions 101 spaced apart on its outer circumference (in the figures of the present invention, three protrusions 101 are provided on each lamination as an example); each protrusion 101 is provided with a bolt hole 102; the bolt hole 102 is used to install the bolt 2; the lamination at one end is defined as a first lamination 103; the lamination at the other end is defined as a second lamination 104; an oil guide cover 4 is provided on the end face of the first lamination 103 away from the second lamination 104 and on the end face of the second lamination 104 away from the first lamination 103, and the first lamination 104 is provided with an oil guide cover 4. The chip 103 is provided with an oil inlet hole 105; the oil inlet hole 105 is used to connect with the oil outlet hole 301 on the housing 3; the second iron chip 104 and the first iron chip 103 are also provided with a first oil groove 106; the first oil groove 106 is connected with the oil inlet 401 of the oil guide cover 4; the laminations between the first iron chip 103 and the second iron chip 104 are provided with a plurality of second oil grooves 107 at intervals along the circumferential direction; the second oil grooves 107 are used to form an internal oil passage; the internal oil passage is also connected with the oil inlet hole 105 and the first oil groove 106 respectively; the oil guide cover 4 is provided with a spray nozzle 402; the cooling oil flows into the internal oil passage along the oil inlet hole 105, then flows out from the first oil groove 106 to the oil guide cover 4, and finally flows out from the spray nozzle 402.

[0061] It should be noted that by adding distributed bosses 101 to the stator core 1 and providing bolt holes 102 for bolts 2 to pass through on the bosses 101, a stable bolt fixation is achieved, ensuring a tight assembly between the stator core 1 and the housing 3.

[0062] It should be noted that the flow sequence of cooling oil in the stator core oil circuit is as follows: oil inlet 105 → internal oil circuit → first oil groove 106 → oil guide cover 4 → spray nozzle 402.

[0063] like Figure 3 As shown, in one embodiment, the oil inlet 105 is provided on a protrusion 101 of the first iron chip 103.

[0064] like Figure 1 As shown, in one embodiment, the boss 101 has a semi-circular structure.

[0065] It should be noted that the boss 101 not only serves the purpose of assembly (realizing the assembly between the stator core 1 and the housing 3), but also serves the purpose of positioning.

[0066] like Figure 3 As shown, in one embodiment, the laminations between the first iron chip 103 and the second iron chip 104 form an iron chip group; the iron chip group includes at least one third iron chip 108 and at least one fourth iron chip 109; the number of the third iron chip 108 and the fourth iron chip 109 are equal (to...). Figure 3 The number of the third iron chip 108 and the fourth iron chip 109 are both three (for example), and the third iron chip 108 and the fourth iron chip 109 are arranged alternately. The second oil groove 107 on the third iron chip 108 is connected to the second oil groove 107 on the fourth iron chip 109 to form the internal oil circuit.

[0067] like Figure 3 , Figure 9A and Figure 9B As shown, in one embodiment, the number of second oil grooves 107 on the third iron chip 108 is equal to that on the fourth iron chip 109, and there is an included angle between the second oil grooves 107 on the third iron chip 108 and the second oil grooves 107 on the fourth iron chip 109. The second oil grooves 107 on the third iron chip 108 and the second oil grooves 107 on the fourth iron chip 109 are evenly spaced.

[0068] It should be noted that by making the second oil groove 107 on the third iron chip 108 and the second oil groove 107 on the fourth iron chip 109 form an angle, the oil grooves between different iron chips (the third iron chip 108 and the fourth iron chip 109) can be misaligned, thereby enabling the cooling oil to flow fully through the stator core 1 and thus improving the cooling effect.

[0069] In one embodiment, the included angle is 180 / n to achieve misalignment of the oil grooves between different iron chips; where n represents the total number of second oil grooves 107 on a third iron chip 108 (or fourth iron chip 109).

[0070] like Figures 1 to 3 As shown, the stator core 1 contains four types of laminations (namely: first lamination 103, second lamination 104, third lamination 108, and fourth lamination 109), totaling eight single-layer core segments. The first lamination 103 and second lamination 104 each have one layer of core with the same stack height, while the third lamination 108 and fourth lamination 109 each have three layers of core with the same stack height. The number of single-layer cores formed by the third lamination 108 and fourth lamination 109 is the same, and they are arranged alternately. The single-layer core formed by the first lamination 103 serves as the lower end face of the stator core 1, and the single-layer core formed by the second lamination 104 serves as the upper end face of the stator core 1. When the eight single-layer core segments are stacked, the laminations are rotated 120° each time, using the boss 101 as a reference (corresponding to three bosses 101 on each lamination).

[0071] In one embodiment, the distance between two adjacent second oil tanks 107 (i.e., the wall thickness of the partition wall) is less than the length of the second oil tank 107 along the circumferential direction.

[0072] It should be noted that by making the distance between two adjacent second oil grooves 107 on the same iron chip (the third iron chip 108 or the fourth iron chip 109) smaller than the length of the second oil groove 107 along the circumferential direction, the solid part between two adjacent second oil grooves 107 on the same iron chip is prevented from blocking the second oil grooves 107 on the adjacent iron chip (which may be the third iron chip 108 or the fourth iron chip 109) when the second oil groove 107 on the third iron chip 108 is misaligned with the second oil groove 107 on the fourth iron chip 109. This ensures the smooth flow of cooling oil inside the stator core.

[0073] In one embodiment, the size of the first oil tank 106 is larger than the size of the second oil tank 107 to ensure smooth oil inlet and outlet.

[0074] like Figure 3 As shown, in one embodiment, both the first oil tank 106 and the second oil tank 107 are rectangular structures.

[0075] In one embodiment, the first oil groove 106 is 0.5-1 mm longer than the second oil groove 107 in both length and width directions.

[0076] In one embodiment, the oil inlet 105 is directly opposite a second oil groove 107 on the target stamping; the target stamping is a stamping adjacent to the first iron chip 103.

[0077] It should be noted that the target wafer could be either the third iron chip 108 or the fourth iron chip 109; for example... Figure 3 The above description takes the third iron chip 108 as an example, which is adjacent to the first iron chip 103. That is, the target chip is the third iron chip 108.

[0078] Specifically, such as Figure 3 As shown, the oil inlet 105 is directly opposite a second oil groove 107 on the third iron chip 108, which can reduce the inlet flow resistance of the oil passage of the stator core.

[0079] like Figure 3 As shown, in one embodiment, the oil inlet hole 105 has a circular structure.

[0080] It should be noted that the position, length and width of the second oil groove 107 on the third iron chip 108 and the fourth iron chip 109 need to be referenced to the outer diameter of the stator core 1 and the outer diameter of the stator winding envelope, and the number of the second oil groove 107 needs to be referenced to the number of core slots of the stator core 1.

[0081] Assuming the outer diameter of stator core 1 is D1, the outer diameter of the stator winding envelope is D2, and the number of core slots on stator core 1 is z (an integer), the length of the second oil slot 107 is a, the width of the second oil slot 107 is b, the wall thickness of the slot partition is c, and the number of second oil slots 107 on a third iron core 108 (or a fourth iron core 109) is n (an integer), then the dimensions and number of the second oil slots 107 must satisfy the following formula:

[0082]

[0083] like Figure 1 , Figure 3 , Figure 9A and Figure 9B As shown, by cutting the stator core 1 along the center indexing circle of the second oil groove 107, from the axial perspective, the second oil groove 107 and the partition wall on the third iron chip 108 and the fourth iron chip 109 are arranged alternately. The partition wall of the next stack of iron cores is basically located above the middle position of the second oil groove 107 of the previous stack of iron cores, and there is a gap between it and the adjacent partition walls on the left and right, so that an internal oil passage is formed after stacking, and then the oil passage of the stator core is formed.

[0084] like Figure 3 and Figures 7A to 7C As shown, in one embodiment, the number of first oil grooves 106 on the second iron chip 104 and the number of first oil grooves 106 on the first iron chip 103 are both two, and the two first oil grooves 106 on the second iron chip 104 and the two first oil grooves 106 on the first iron chip 103 are symmetrically distributed on both sides of the neutral plane; wherein, the neutral plane is a plane formed by the central axis of the stator core 1 and the central axis of the oil inlet hole 105 being coplanar.

[0085] In one embodiment, the oil inlet 105 is located in the direction of gravity (corresponding to...). Figure 7A The bottommost point (shown as the direction of gravity).

[0086] It should be noted that, in order to prevent dead zones inside the oil passages of the stator core and to ensure that the oil inlet 105 is at the lowest point in the direction of gravity, the first oil groove 106 on the second iron chip 104 and the first oil groove 106 on the first iron chip 103 are basically aligned in the direction of gravity (corresponding to...). Figure 7A The uppermost part of the gravity direction shown (without considering shell 3).

[0087] like Figure 1 and Figure 3 As shown, in one embodiment, both the first iron chip 103 and the second iron chip 104 are provided with threaded mounting holes 110; a fixing bolt 111 is provided in the threaded mounting hole 110.

[0088] Specifically, the oil guide cover 4 is threadedly connected to the first iron chip 103 and the second iron chip 104 respectively by the fixing bolt 111.

[0089] It should be noted that the oil guide cover 4 is a cavity structure with oil collection function, and a spray nozzle is provided on it to guide the cooling oil jet, thereby achieving the cooling of the stator winding.

[0090] In one embodiment, the spray nozzle 402 has a cross-sectional dimension of 1mm × 1mm.

[0091] In one embodiment, the size of the oil inlet 401 is greater than or equal to the size of the first oil trough 106 to reduce the oil flow resistance.

[0092] like Figure 8B As shown, in one embodiment, the oil inlet 401 has a rectangular structure.

[0093] In one embodiment, the oil inlet 401 is 0.5-1 mm longer than the first oil groove 106 in both length and width directions.

[0094] like Figures 8A to 8C As shown, in one embodiment, there are multiple spray nozzles 402, and each spray nozzle 402 is provided with a baffle 403 on the same side.

[0095] It should be noted that when the outlet flow rate is high, the baffle 403 can prevent the oil columns from different spray nozzles 402 from colliding or interfering; when the outlet flow rate is low, the baffle 403 can guide and isolate different oil outlet channels, preventing the oil flowing out of the spray nozzles 402 from all converging on one side.

[0096] In one embodiment, a plurality of spray nozzles 402 are evenly disposed on the oil guide cover 4.

[0097] It should be noted that by evenly arranging multiple spray nozzles 402 on the oil guide cover 4, the uniformity of the cooling oil sprayed from the spray nozzles 402 is ensured, avoiding the situation where the cooling oil is relatively concentrated in some places and relatively dispersed in others, thereby ensuring the cooling effect of the cooling oil sprayed from the spray nozzles 402 on the stator winding.

[0098] It should be noted that the cooling oil first enters the oil inlet 105 of the stator core 1 through the oil outlet 301 of the housing 3, then fills the internal oil passage, and finally converges to the oil guide cover 4 through the first oil groove 106. After the cooling oil fills the oil guide cover 4, it is sprayed out from its spray nozzle 402 to the stator winding.

[0099] In one embodiment, the oil guide cover 4 is an injection-molded integral or a distributed assembly.

[0100] like Figures 8A to 8C As shown, in one embodiment, the oil guide cover 4 has an overall arc-shaped structure with an angle between 100-120°.

[0101] like Figure 1 and Figures 8A to 8C As shown, in one embodiment, the oil guide cover 4 includes two sealing plates 404, two oil collecting chambers 405, and three mounting plates 406; wherein, the oil collecting chambers 405 and the mounting plates 406 are spaced apart, and each oil collecting chamber 405 is located between two mounting plates 406 (the two ends of the oil collecting chamber 405 are respectively connected to the two mounting plates 406), and one sealing plate 404 is provided on one side of each oil collecting chamber 405; the number of oil inlets 401 is two; the two oil inlets 401 are respectively provided on two... On the other side of the oil collection chamber 405, an oil inlet 401 is connected to a first oil groove 106 on the first iron chip 103 or the second iron chip 104; the number of spray nozzles 402 is at least two, and at least two spray nozzles 402 are divided into two spray groups; a spray group is correspondingly provided on an oil collection chamber 405, and a spray group includes at least one spray nozzle 402; the mounting plate 406 is connected to the first iron chip 103 or the second iron chip 104.

[0102] like Figure 8A As shown, in one embodiment, each mounting plate 406 is provided with bolt positioning holes 407.

[0103] Specifically, such as Figure 3 and Figure 8A As shown, in this embodiment, the number of threaded mounting holes 110 on the first iron chip 103 and the second iron chip 104 is three, and each threaded mounting hole 110 corresponds to a bolt positioning hole 407 on the mounting plate 406; the fixing bolt 111 passes through the bolt positioning hole 407 and the threaded mounting hole 110 in sequence to realize the connection between the mounting plate 406 and the first iron chip 103 or the second iron chip 104, thereby realizing the connection between the oil guide cover 4 and the first iron chip 103 or the second iron chip 104.

[0104] like Figure 8A As shown, in one embodiment, the number of spray nozzles 402 is multiple and even, and these even-numbered spray nozzles 402 are divided into two spray groups; each spray group includes multiple spray nozzles 402 (as shown in the figure). Figure 8A (Taking 10 spray nozzles as an example for illustration), and multiple spray nozzles 402 in each spray group are evenly arranged on the oil collection chamber 405.

[0105] In one embodiment, the end face of the sealing plate 404 is provided with a pin structure, which is connected to the oil collecting cavity 405 by interference fit with the pin structure.

[0106] like Figure 3 As shown, in one embodiment, apart from the necessary threaded mounting holes 110 (taking three threaded mounting holes 110 as an example) and the first oil grooves 106 (taking two first oil grooves 106 as an example), the rest of the second iron chip 104 is solid. Even though the top of the oil inlet hole 105 of the first iron chip 103 is blocked, this ensures that the stator core oil circuit has only four outlets (two symmetrically distributed first oil grooves 106 on the first iron chip 103 and the second iron chip 104 serve as these four outlets), thereby realizing the filling and circulation of the oil circuit.

[0107] In one embodiment, the present invention also provides a stator, the stator comprising: a stator winding and the stator core 1 described above; the stator winding is assembled with the core slot 112 of the stator core 1.

[0108] It should be noted that the stator provided by the present invention is an assembly based on the armature and assembled in a secondary manner. The armature includes key components such as stator windings and stator core 1. The stator is additionally equipped with two oil guide covers 4 on the basis of the armature to enhance the oil cooling performance.

[0109] like Figure 1 , Figure 3 , Figure 4A , Figure 4B and Figure 5 As shown, in one embodiment, the present invention also provides an electric motor, the electric motor comprising: a housing 3 and the stator described above.

[0110] Specifically, the housing 3 is provided with a plurality of threaded holes 302 (to... Figure 5 (Taking three threaded holes 302 as an example for explanation); the threaded holes 302 correspond to the bolt holes 102 of the stator core 1 of the stator; the assembly between the stator and the housing 3 is achieved by the bolt 2 passing through the bolt holes 102 and the threaded holes 302 (actually the assembly between the stator core 1 and the housing 3); the housing 3 is also provided with an oil inlet 303 and an oil outlet 301; the oil outlet 301 is connected to the oil inlet 303 and the oil inlet 105 of the stator core 1 respectively.

[0111] In one embodiment, a gap is left between the outer circular surface of the stator core 1 and the inner circular surface of the housing 3 to prevent interference between the oil guide cover 4 and the housing 3.

[0112] The assembly principle between the housing 3 and the stator core 1 will be further explained below through specific embodiments.

[0113] like Figure 1 , Figure 4A , Figure 4B and Figure 5 As shown, in one embodiment, a stepped surface is machined at the lower end of the housing 3, with three threaded holes 302 for mounting bolts 2; to prevent interference between the oil guide cover 4 and the housing 3, only the lower end face of the stator core 1 with the boss feature mates with the stepped surface of the housing 3, and a gap is left between the outer circular surface of the stator core 1 and the inner circular surface of the stepped surface of the housing 3; a boss is machined on the outer circular surface of the housing 3, and through holes and pipe threads are machined inward from the end face of the boss to form the oil inlet 303 of the housing 1 for mounting parts such as oil inlet pipes; a drilled hole is machined on the stepped surface of the housing, which is connected to the oil inlet 303 and serves as the oil outlet 301 of the housing 3.

[0114] like Figure 6 As shown, in one embodiment, the oil outlet 301 is coaxially aligned with the oil inlet 105, and the size of the oil outlet 301 is smaller than the size of the oil inlet 105.

[0115] It should be noted that, Figure 6 The arrows in the diagram indicate the oil passage connection path from housing 3 to stator core 1.

[0116] In one embodiment, the radius of the oil outlet 301 is 0.5-1 mm smaller than the radius of the oil inlet 105.

[0117] In one embodiment, the oil inlet 303 is connected to an oil supply device.

[0118] Specifically, cooling oil is introduced into the housing 3 through the oil supply equipment and flows through the internal channels of the housing 3 to the oil inlet 105 of the stator core 1, where it will fill the internal oil passage. Finally, the cooling oil is collected in the oil guide cover 4 through the first oil tank 106 and sprayed out to the stator winding through its spray nozzle 402.

[0119] It should be noted that the stator core, stator, and motor provided by this invention eliminate the need for external oil pipes in the circumferential direction of the stator, improving the internal space utilization of the motor. By integrating the oil cooling system inside the stator core and housing, the size and weight of the motor are effectively reduced. The cooling oil circulates inside the stator core, resulting in higher stator cooling efficiency and more stable performance. This oil-cooled structure design has stable cooling performance, smaller space occupation, high integration, and strong manufacturability, enabling cost reduction and efficiency improvement. Its competitive advantage in the new energy vehicle market will become increasingly prominent. It effectively solves the problems of existing technologies where, under oil-cooled conditions, the motor cooling system has many components, complex assembly, unstable cooling performance, low internal space utilization, and large motor size.

[0120] The descriptions of the processes or structures corresponding to the above figures each have their own emphasis. For parts of a process or structure that are not described in detail, please refer to the relevant descriptions of other processes or structures.

[0121] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A stator core, characterized in that, The stator core is used to assemble with the housing by bolts. The stator core includes: multiple laminations; the multiple laminations are stacked, and each lamination has at least two bosses spaced apart on its outer circumference. Each of the aforementioned bosses is provided with a bolt hole; the bolt hole is used to install the bolt. The lamination at one end is defined as the first iron chip; the lamination at the other end is defined as the second iron chip. An oil guide cover is provided on the end face of the first iron chip away from the second iron chip, and on the end face of the second iron chip away from the first iron chip. An oil inlet hole is provided on the first iron chip. The oil inlet hole is used to connect with the oil outlet hole on the housing. Both the second iron chip and the first iron chip are provided with a first oil groove; the first oil groove is electrically connected to the oil inlet of the oil guide cover; the laminations between the first iron chip and the second iron chip are provided with a plurality of second oil grooves at intervals along the circumferential direction; the second oil grooves are used to form internal oil passages; the internal oil passages are also electrically connected to the oil inlet and the first oil groove respectively. The oil guide cover is equipped with a spray nozzle; Cooling oil flows into the internal oil passage through the oil inlet, then flows out from the first oil tank to the oil guide cover, and finally flows out from the spray nozzle.

2. The stator core according to claim 1, characterized in that, The laminations between the first iron chip and the second iron chip form an iron chip group; the iron chip group includes at least one third iron chip and at least one fourth iron chip. The number of the third iron chip and the fourth iron chip are equal, and the third iron chip and the fourth iron chip are arranged alternately. The second oil groove on the third iron chip and the second oil groove on the fourth iron chip are connected to form the internal oil circuit.

3. The stator core according to claim 2, characterized in that, The number of second oil grooves on the third iron chip is equal to that on the fourth iron chip, and there is an angle between the second oil grooves on the third iron chip and the second oil grooves on the fourth iron chip. The second oil grooves on the third iron chip and the second oil grooves on the fourth iron chip are equally spaced.

4. The stator core according to claim 3, characterized in that, The included angle is 180 / n; where n represents the total number of second oil grooves on the third iron chip.

5. The stator core according to claim 3, characterized in that, The distance between two adjacent second oil tanks is less than the length of the second oil tank along the circumferential direction.

6. The stator core according to claim 1, characterized in that, The size of the first oil tank is larger than the size of the second oil tank.

7. The stator core according to claim 1, characterized in that, The oil inlet is directly opposite a second oil groove on the target stamping; The target lamination is the lamination adjacent to the first iron chip.

8. The stator core according to claim 1, characterized in that, The number of first oil grooves on the second iron chip and the number of first oil grooves on the first iron chip are both two, and the two first oil grooves on the second iron chip and the two first oil grooves on the first iron chip are symmetrically distributed on both sides of the neutral plane; wherein, the neutral plane is a plane formed by the coplanarity of the central axis of the stator iron core and the central axis of the oil inlet hole.

9. The stator core according to claim 8, characterized in that, The oil inlet is located at the lowest point in the direction of gravity.

10. The stator core according to claim 8, characterized in that, The oil guide cover has an overall arc-shaped structure and includes two sealing plates, two oil collection chambers, and three mounting plates; wherein... The oil collecting chamber is spaced apart from the mounting plate, and each oil collecting chamber is located between two mounting plates. A sealing plate is provided on one side of each oil collecting chamber. The number of oil inlets is two, with the two oil inlets respectively located on the other side of the two oil collection cavities, and one oil inlet being connected to a first oil groove on the first iron chip or the second iron chip. The number of spray nozzles is at least two, and at least two spray nozzles are divided into two spray groups; one spray group is correspondingly provided on one of the oil collection chambers, and one spray group includes at least one spray nozzle; The mounting plate is connected to either the first iron chip or the second iron chip.

11. The stator core according to claim 1, characterized in that, The size of the oil inlet is greater than or equal to the size of the first oil tank.

12. The stator core according to any one of claims 1 to 11, characterized in that, The number of spray nozzles is multiple, and each spray nozzle is provided with a baffle on the same side.

13. The stator core according to claim 12, characterized in that, Multiple spray nozzles are evenly arranged on the oil guide cover.

14. A stator, characterized in that, The stator comprises: a stator winding and a stator core according to any one of claims 1-13; the stator winding is assembled with the core slot of the stator core.

15. An electric motor, characterized in that, The motor comprises: a housing and a stator as described in claim 14; wherein... The housing is provided with multiple threaded holes; one of the threaded holes corresponds to a bolt hole in the stator core of the stator; the stator and the housing are assembled by passing a bolt through the bolt hole and the threaded hole. The housing is also provided with an oil inlet and an oil outlet; the oil outlet is connected to the oil inlet and the oil inlet of the stator core respectively.

16. The motor according to claim 15, characterized in that, A gap is left between the outer circular surface of the stator core and the inner circular surface of the housing.

17. The motor according to claim 15, characterized in that, The oil outlet hole is coaxially aligned with the oil inlet hole, and the size of the oil outlet hole is smaller than the size of the oil inlet hole.

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