Electric vehicle motor end cover and motor thereof

Abstract

The electric vehicle motor end cover comprises a cover body, a plurality of first polygonal grooves are distributed in the inner end face of the cover body, a plurality of second polygonal grooves are distributed in the inner ring face of the cover body, all the first polygonal grooves are adjacently distributed in the inner end face of the cover body, and the second polygonal grooves are distributed in the inner ring face of the cover body. All the second polygonal grooves are adjacent in pairs to form an annular groove set, the annular groove set is arranged close to the inner end face of the cover body, the arrangement of the first polygonal grooves and the second polygonal grooves enables the inner side face of the cover body to form a honeycomb structure, and the first polygonal grooves and the second polygonal grooves are both hexagonal grooves. The groove depth H of the first polygonal groove and the groove depth H of the second polygonal groove are both 25%-35% of the nominal wall thickness of the cover body. The first polygonal groove and the second polygonal groove are formed in the cover body, so that a hexagonal honeycomb structure is formed, the surface area of an inner cavity of the motor is increased, the heat dissipation efficiency of the motor is improved, the output power value of the motor is further improved, and the power density of the motor is improved.

Description

An electric vehicle motor end cover and its motor Technical Field

[0001] This invention relates to an electric vehicle motor end cover and the motor thereof, belonging to the field of electric vehicle motor technology. Background Technology

[0002] Electric vehicles generate a significant amount of heat during operation, primarily due to copper and iron losses and friction between the stator and rotor of the motor. As vehicle speed increases, these losses gradually increase, leading to a corresponding increase in heat generation. This increased heat necessitates heat dissipation. Electric vehicle motors typically employ air cooling, relying entirely on convection heat exchange between the motor casing and the air. The stator generates substantial heat, which is primarily conducted through internal airflow to the inner surface of the rotor, and then from the rotor to the motor casing for dissipation. However, current motor casings have a simple structure, primarily serving to protect the motor from external damage but offering no additional cooling function. This results in poor motor cooling, increased overall motor temperature, reduced motor lifespan, decreased efficiency, and even potential motor burnout. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an electric vehicle motor end cover and motor that increases the surface area of ​​the motor cavity and improves the heat dissipation efficiency of the motor.

[0004] To achieve the objective, the technical solution adopted by the present invention is as follows: an electric vehicle motor end cover, comprising a cover body, wherein a plurality of first polygonal grooves are arranged on the inner end face of the cover body, and a plurality of second polygonal grooves are arranged on the inner ring surface of the cover body. All the first polygonal grooves are adjacent to each other and fully cover the inner end face of the cover body. All the second polygonal grooves are adjacent to each other to form a ring groove group. The ring groove group is located close to the inner end face of the cover body. The arrangement of the plurality of first polygonal grooves and second polygonal grooves makes the inner side surface of the cover body form a honeycomb structure. Both the first polygonal grooves and the second polygonal grooves are hexagonal grooves. The groove depth H of the first polygonal grooves and the second polygonal grooves is 25% to 35% of the nominal wall thickness of the cover body.

[0005] As a further optimization of the above technical solution: a partition rib is formed between each of the two adjacent first polygonal grooves and the two adjacent second polygonal grooves, and the width W of the partition rib is 1.3 to 2 times the groove depth H.

[0006] As a further optimization of the above technical solution: the length L of the partition rib is 10 to 12 times the width W of the partition rib.

[0007] As a further optimization of the above technical solution: the inner end face of the cover is provided with a plurality of reinforcing ribs, the center of the cover is provided with a bearing chamber, the end face of the reinforcing ribs is connected to the outer wall of the bearing chamber, and the thickness of the reinforcing ribs decreases outward from the outer wall of the bearing chamber.

[0008] As a further optimization of the above technical solution: the inner side of the cover is also provided with a ring of connecting ribs, the ring of connecting ribs is connected to all the reinforcing ribs, and the connection between the ring of connecting ribs and some of the reinforcing ribs is also provided with reinforcing protrusions.

[0009] As a further optimization of the above technical solution: the cover is made of die-cast aluminum alloy.

[0010] As a further optimization of the above technical solution, it also includes a rotor, a stator, a hub, and a brake cover. The stator includes stator steel sheets, a stator support, an insulating plate, and windings sleeved on the stator steel sheets. There are two insulating plates, which are respectively arranged close to the two sides of the stator steel sheets. The insulating plates are located between the windings and the stator steel sheets. The two ends of the outer circumference of the stator support are bent outward to form a fixing part. A support groove is formed between the two fixing parts. The inner ends of the stator steel sheets and the insulating plates are located in the support groove. The side of the fixing part is close to the insulating plate. The rotor includes a magnetic ring sleeved on the outside of the stator and a plurality of magnets evenly distributed and fixed on the inner circumference of the magnetic ring. The magnetic ring is fixed on the inner circumference of the hub. The brake cover and the cover body are respectively installed on the two end faces of the magnetic ring. The inner side of the brake cover has a plurality of hexagonal grooves arranged to form a honeycomb structure.

[0011] Compared with existing technologies, this invention increases the surface area of ​​the motor cavity by setting a first polygonal groove and a second polygonal groove on the cover to form a hexagonal honeycomb structure. This increases the contact area between the cover and the air inside the motor, resulting in greater heat absorption and improved heat dissipation efficiency, further increasing the motor's output power and thus improving the motor's power density. By controlling the size, arrangement density, and depth of the first and second polygonal grooves, the strength of the cover is ensured, meeting the molding requirements of die casting and guaranteeing manufacturing feasibility. At the same time, sufficient surface area is increased, effectively improving heat dissipation efficiency. This also prevents excessive partition ribs from increasing material usage and cover weight, achieving motor lightweighting and cost control. Reinforcing ribs and annular connecting ribs further strengthen the cover, ensuring that the overall strength of the cover is improved or maintained while meeting the lightweight requirements of the motor end cover. Attached Figure Description

[0012] Figure 1 is a cross-sectional structural diagram of the present invention.

[0013] Figure 2 is an enlarged structural diagram of point A in Figure 1.

[0014] Figure 3 is a three-dimensional structural diagram of the cover in this invention.

[0015] Figure 4 is an enlarged structural diagram of point B in Figure 3. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. As shown in Figures 1-4, an electric vehicle motor includes an end cover, which includes a cover body 1. A plurality of first polygonal grooves 11 are arranged on the inner end face of the cover body 1, and a plurality of second polygonal grooves 16 are arranged on the inner ring face of the cover body 1. All the first polygonal grooves 11 are adjacent to each other and fully cover the inner end face of the cover body 1. All the second polygonal grooves 16 are adjacent to each other to form a ring groove group. The ring groove group is set close to the inner end face of the cover body 1, so that there is no polygonal groove structure at the outer end of the inner ring face of the cover body 1, thus ensuring the strength of the cover body 1.

[0017] In the above technical solution, the arrangement of multiple first polygonal grooves 11 and second polygonal grooves 16 forms a honeycomb structure on the inner side of the cover 1. Both the first polygonal grooves 11 and the second polygonal grooves 16 are hexagonal grooves, with the first polygonal groove 11 specifically being a regular hexagonal groove. The honeycomb hexagonal groove arrangement achieves an optimal balance between dense coverage, material saving, and structural stability, allowing the cover 1 to obtain the largest surface area with the smallest volume and the least amount of material while ensuring manufacturing feasibility (die-cast parts have minimal feature points; if the wall thickness or shape is too small, die-casting is not possible). The increased surface area results in a larger contact area between the cover 1 and the air inside the motor, leading to greater heat absorption. Heat dissipation from the cover 1 is achieved through convection between the cover 1 and the external air, improving the motor's heat dissipation efficiency. Simultaneously, it meets the requirement for lightweight motor end covers.

[0018] In the above technical solution: the groove depth H of the first polygonal groove 11 and the second polygonal groove 16 is 25% to 35% of the nominal wall thickness of the cover 1. The nominal wall thickness of the cover 1 is generally 2mm to 3.5mm. The above range of groove depth H balances the relationship between the strength and surface area of ​​the cover 1, avoiding the cover 1 from becoming weak due to the groove depth H being too deep and easily damaged, and also avoiding the increase in surface area of ​​the inner cavity of the cover being too shallow, resulting in a small improvement in the heat dissipation efficiency of the motor.

[0019] In the above technical solution: A partition rib 17 is formed between each pair of adjacent first polygonal grooves 11 and each pair of adjacent second polygonal grooves 16. The width W of the partition rib 17 is 1.3 to 2 times the groove depth H. The length L of the partition rib 17 is 10 to 12 times the width W. The width W of the partition rib 17 is the distance between two adjacent first polygonal grooves 11 or two adjacent second polygonal grooves 16, and the length L of the partition rib 17 is the size of the first polygonal groove 11 and the second polygonal groove 16. The width W and length L of the partition rib 17 simultaneously determine the arrangement density of the first polygonal grooves 11 and the second polygonal grooves 16. The above numerical range ensures the strength of the cover 1, meets the molding requirements of die casting, ensures manufacturing feasibility, and increases sufficient surface area, effectively improving heat dissipation efficiency. Simultaneously, it prevents the partition rib 17 from accounting for too much material, thus increasing the weight of the cover 1, achieving motor lightweighting, and controlling costs.

[0020] In the above technical solution: the inner end face of the cover 1 is provided with a plurality of reinforcing ribs 12, specifically an even number of reinforcing ribs 12; a bearing chamber 14 is provided at the center of the cover 1; the end face of the reinforcing ribs 12 is connected to the outer wall of the bearing chamber 14; and the thickness of the reinforcing ribs 12 decreases outward from the outer wall of the bearing chamber 14. The reinforcing ribs 12 can increase the rigidity of the cover 1.

[0021] In the above technical solution: the inner side of the cover 1 is also provided with a ring-shaped connecting rib 13, which is connected to all the reinforcing ribs 12 to improve the strength of the cover 1. The connection between the ring-shaped connecting rib 13 and some of the reinforcing ribs 12 is also provided with reinforcing protrusions 15, which facilitate the screw connection of the subsequent expansion interface.

[0022] In the above technical solution: the cover 1 is made of high-pressure die-casting material, more specifically, the cover 1 is made of aluminum alloy die-casting. The cover 1 is die-cast, and the die-casting mold has corresponding regular hexagonal protrusions. Since the first polygonal groove 11 is located on a plane, while the second polygonal groove 16 is located on an inclined plane, the first polygonal groove 11 obtained by die-casting is a regular hexagonal groove, while the second polygonal groove 16 is deformed due to the inclined plane die-casting and is not a regular hexagonal groove.

[0023] This invention forms a hexagonal honeycomb structure by setting a first polygonal groove 11 and a second polygonal groove 16 on the cover 1. While ensuring the lightweight requirement of the motor end cover, it improves its strength or maintains its original state. At the same time, it increases the surface area of ​​the motor cavity. The total surface area of ​​the inner side of the cover 1 is increased by 8% to 10% compared with the total surface area of ​​the inner side of the existing end cover. This increases the contact area between the cover 1 and the air inside the motor, resulting in more heat absorption, improving the heat dissipation efficiency of the motor, and further increasing the output power value of the motor, thereby increasing the power density of the motor.

[0024] The above technical solution also includes a rotor, a stator, a hub 6, and a brake cover 7. The stator includes stator steel sheets 2, a stator support 3, an insulating plate 4, and windings 5 ​​sleeved on the stator steel sheets 2. Two insulating plates 4 are provided, each tightly attached to one of the two sides of the stator steel sheet 2. The insulating plates 4 are located between the windings 5 ​​and the stator steel sheets 2, providing insulation protection between them. The two ends of the outer circumference of the stator support 3 are bent outwards to form fixing parts 31. A support groove is formed between the two fixing parts 31. The inner ends of the stator steel sheets 2 and the insulating plates 4 are both located within the support groove. The sides of the fixing parts 31 are tightly attached to the insulating plates 4. The two fixing parts 31 serve to position and reinforce the installation of the insulating plates 4. The rotor includes a magnetic ring 8 sleeved on the outside of the stator and multiple magnets 9 evenly distributed and fixed on the inner circumferential surface of the magnetic ring 8. The magnetic ring 8 is fixed to the inner circumferential surface of the hub 6. The brake cover 7 and the cover body 1 are respectively installed on the two end faces of the magnetic ring 8. The inner side of the brake cover 7 can also have multiple hexagonal grooves arranged to form a honeycomb structure, which is conducive to heat dissipation.

[0025] The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of the present invention without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of the present invention through logical analysis, reasoning, or limited experimentation on the basis of existing technology should fall within the protection scope of the present invention.

Claims

1. An electric vehicle motor end cover, comprising a cover body (1), characterized in that... The inner end face of the cover (1) is provided with a plurality of first polygonal grooves (11), and the inner ring face of the cover (1) is provided with a plurality of second polygonal grooves (16). All the first polygonal grooves (11) are adjacent to each other and fully cover the inner end face of the cover (1). All the second polygonal grooves (16) are adjacent to each other to form a ring groove group. The ring groove group is set close to the inner end face of the cover (1). The arrangement of the plurality of first polygonal grooves (11) and second polygonal grooves (16) makes the inner side of the cover (1) form a honeycomb structure. The first polygonal grooves (11) and the second polygonal grooves (16) are both hexagonal grooves. The groove depth H of the first polygonal grooves (11) and the second polygonal grooves (16) is 25% to 35% of the nominal wall thickness of the cover (1).

2. The electric vehicle motor end cover according to claim 1, characterized in that... A partition rib (17) is formed between each of two adjacent first polygonal grooves (11) and two adjacent second polygonal grooves (16), and the width W of the partition rib (17) is 1.3 to 2 times the groove depth H.

3. The electric vehicle motor end cover according to claim 2, characterized in that... The length L of the partition rib (17) is 10 to 12 times the width W of the partition rib (17).

4. The electric vehicle motor end cover according to claim 1, characterized in that... The inner end face of the cover (1) is provided with a plurality of reinforcing ribs (12), and the center of the cover (1) is provided with a bearing chamber (14). The end face of the reinforcing ribs (12) is connected to the outer wall of the bearing chamber (14), and the thickness of the reinforcing ribs (12) decreases outward from the outer wall of the bearing chamber (14).

5. The electric vehicle motor end cover according to claim 4, characterized in that... The inner side of the cover (1) is also provided with a ring-shaped connecting rib (13), which is connected to all the reinforcing ribs (12). The connection between the ring-shaped connecting rib (13) and some of the reinforcing ribs (12) is also provided with reinforcing protrusions (15).

6. The electric vehicle motor end cover according to claim 1, characterized in that... The cover (1) is made of die-cast aluminum alloy.

7. An electric motor, comprising an electric vehicle motor end cover as described in any one of claims 1-6, characterized in that... It also includes a rotor, a stator, a hub (6), and a brake cover (7). The stator includes stator steel sheets (2), a stator support (3), an insulating plate (4), and a winding (5) sleeved on the stator steel sheets (2). There are two insulating plates (4), which are respectively set close to the two sides of the stator steel sheets (2). The insulating plates (4) are located between the winding (5) and the stator steel sheets (2). The two ends of the outer peripheral surface of the stator support (3) are bent outward to form a fixing part (31). A support groove is formed between the two fixing parts (31). The inner ends of the stator steel sheet (2) and the insulating plate (4) are both located in the bracket groove. The side of the fixing part (31) is in close contact with the insulating plate (4). The rotor includes a magnetic ring (8) sleeved on the outside of the stator and multiple magnets (9) evenly distributed and fixed on the inner circumferential surface of the magnetic ring (8). The magnetic ring (8) is fixed on the inner circumferential surface of the hub (6). The brake cover (7) and the cover body (1) are respectively installed on the two end faces of the magnetic ring (8). The inner side of the brake cover (7) is arranged with multiple hexagonal grooves to form a honeycomb structure.

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