Liquid-cooled stator core and motor

Abstract

This invention discloses a liquid-cooled stator core and a motor. The core is annular, and multiple capsule-shaped nozzles are respectively formed on the two surfaces of the core. Each pair of capsule-shaped nozzles is connected to form an oil passage. Multiple flow grooves communicating with the capsule-shaped nozzles are formed along the circumference of the core. The multiple flow grooves are staggered on the side of the core in a direction parallel to the core axis, resulting in lower flow resistance and improved NVH performance.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to a liquid-cooled stator core and motor. Background Technology

[0002] Currently, with the rapid development of the new energy vehicle industry, the requirements for electromagnetic power density are becoming increasingly stringent. Generally, increased power density is accompanied by increased motor losses. To quickly dissipate these losses and prevent overheating, a higher-performance cooling system is needed. Therefore, this invention proposes a liquid-cooled stator core and motor, which has the advantages of a large spray area, excellent cooling effect, low flow resistance, minimal impact on electromagnetic performance, and minimal impact on core stiffness. Summary of the Invention

[0003] The purpose of this invention is to provide a liquid-cooled stator core and motor with lower flow resistance and improved NVH performance.

[0004] According to the present invention, a liquid-cooled stator core is provided, the core is annular, and multiple capsule-shaped nozzles are respectively provided on the two surfaces of the core. Each pair of capsule-shaped nozzles are connected to form an oil passage. Multiple flow grooves communicating with the capsule-shaped nozzles are provided along the circumference of the core. The multiple flow grooves are distributed alternately on the side of the core in a direction parallel to the axis of the core.

[0005] The capsule-shaped nozzle is capsule-shaped. When the iron core is actually installed inside the motor housing, the liquid inlet of the motor housing is directly opposite the side of the iron core. The coolant enters from the liquid inlet of the motor housing, first flows to the flow channel, and then flows through the oil passage to the capsule-shaped nozzle. The capsule-shaped nozzle sprays coolant onto the motor windings. Compared with other shapes (such as rectangular) capsule-shaped nozzles, the capsule-shaped nozzle has a smoother oil passage and less flow resistance when the equivalent spray area is the same.

[0006] Furthermore, the capsule-shaped nozzle is stepped inward, and the stepped shape is inclined towards the center of the iron core.

[0007] Furthermore, the iron core includes a plurality of laminations stacked sequentially, with capsule-shaped nozzles respectively opened on the laminations at both ends, and a plurality of flow grooves communicating with the capsule-shaped nozzles respectively opened on the sides of the remaining laminations. The plurality of flow grooves are distributed alternately in sequence on the sides of the laminations along a direction parallel to the axis of the laminations, and the overlapping portion of the plurality of flow grooves along the axis of the laminations forms the oil passage.

[0008] Furthermore, the thickness of the lamination decreases sequentially from the center towards both ends.

[0009] Furthermore, the iron core includes a first lamination, a second lamination, a plurality of third laminations, a second lamination, and a first lamination stacked in sequence.

[0010] Furthermore, the first and second stampings are provided with a plurality of capsule-shaped nozzles on their surfaces, and the third stampings are provided with a plurality of flow grooves on their sides. The flow grooves are arranged alternately on the sides of the third stampings along a direction parallel to the axis of the third stampings, and the overlapping portions of the flow grooves form the oil passage.

[0011] Furthermore, the third lamination has multiple protrusions spaced apart on its side, and a stop is provided between every two protrusions. The side of each protrusion is provided with a first platform, a ramp, and a second platform in sequence to the adjacent stop. The second platform is closer to the center of the third lamination than the first platform. The protrusions, the stop, the first platform, the ramp, and the second platform together form the flow groove.

[0012] Furthermore, the side of the protrusion is provided with a strip-shaped groove that communicates with the flow groove. The strip-shaped sleeve is perpendicular to the axis of the third punch. After multiple third punches are stacked, the stop block on the third punch partially blocks the strip-shaped groove on the adjacent third punch.

[0013] The present invention also provides an electric motor, including the liquid-cooled stator core described above. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the iron core structure according to an embodiment of the present invention.

[0015] Figure 2 for Figure 1 Enlarged view of the structure at point A in the middle.

[0016] Figure 3 This is a schematic diagram of the structure of the third lamination according to an embodiment of the present invention.

[0017] In the diagram, 1-iron core; 2-capsule-shaped nozzle; 3-oil passage; 4-flow groove; 5-first stamping; 6-second stamping; 7-third stamping; 8-protrusion; 9-stop; 10-first platform; 11-slope; 12-second platform; 13-strip groove. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0019] Combination Figures 1 to 3 The present invention illustrates a liquid-cooled stator core. The core 1 is annular, and multiple capsule-shaped nozzles 2 are respectively opened on the two surfaces of the core 1. Each pair of capsule-shaped nozzles 2 are connected to form an oil passage 3. Multiple flow grooves 4 are opened along the circumference of the core 1 and communicate with the capsule-shaped nozzles 2. The multiple flow grooves 4 are distributed alternately on the side of the core 1 in a direction parallel to the axis of the core 1.

[0020] It is worth noting that the capsule-shaped nozzle 2 is capsule-shaped. When the iron core is actually installed in the motor housing, the liquid inlet of the motor housing is directly opposite the side of the iron core. The coolant enters from the liquid inlet of the motor housing, first flows to the flow channel 4, and then flows through the oil passage 3 to the capsule-shaped nozzle 2. The capsule-shaped nozzle 2 sprays coolant onto the motor windings. When the equivalent spray area is the same, the capsule-shaped nozzle has a smoother oil passage and less flow resistance compared with other shapes (such as rectangular) capsule-shaped nozzles.

[0021] The capsule-shaped nozzle at the end of the stator core encloses an inner cavity, which not only increases the axial height of the capsule-shaped nozzle section at the end of the stator core to reduce the deformation of the stator core end after heat fitting, but also allows the capsule-shaped nozzle to be closer to the outer diameter of the stator core under a certain spray angle, thereby reducing the adverse effects on electromagnetic performance.

[0022] The capsule-shaped nozzles are stepped inward at two points, and the steps are inclined towards the center of the iron core 1.

[0023] The iron core 1 includes multiple laminations stacked in sequence. Capsule-shaped nozzles 2 are respectively opened on the laminations at both ends. Multiple flow grooves 4 communicating with the capsule-shaped nozzles 2 are respectively opened on the side of the remaining laminations. The multiple flow grooves 4 are distributed alternately on the side of the lamination along the direction parallel to the axis of the lamination. The overlapping part of the multiple flow grooves 4 along the axis of the lamination forms an oil passage 3.

[0024] The thickness of the lamination decreases from the center towards both ends.

[0025] The iron core 1 includes a first lamination 5, a second lamination 6, multiple third laminations 7, a second lamination 6, and a first lamination 5 stacked in sequence.

[0026] Multiple capsule-shaped nozzles 2 are provided on the surfaces of the first stamping 5 and the second stamping 6. Multiple flow grooves 4 are provided on the sides of the multiple third stampings 7. The multiple flow grooves 4 are distributed alternately on the sides of the third stampings 7 along the direction parallel to the axis of the third stamping 7. The overlapping part of the multiple flow grooves 4 forms an oil passage 3.

[0027] It is worth noting that a fourth stamp can be further provided between the first stamp 5 and the second stamp 6. The thickness of the fourth stamp is the same as that of the first stamp 5, but the capsule-shaped nozzle 2 opened on the fourth stamp is farther away from the axis of the stamp than that on the first stamp 5. That is, the capsule-shaped nozzles opened on the first stamp 5, the fourth stamp, and the second stamp 6 form a stepped shape.

[0028] The third lamination 7 has multiple protrusions 8 spaced apart on its side. A stop block 9 is provided between every two protrusions 8. A first platform 10, a ramp 11, and a second platform 12 are arranged sequentially on the side of the protrusion 8 toward the adjacent stop block 9. The second platform 12 is closer to the center of the third lamination 7 than the first platform 10. The protrusions 8, stop blocks 9, first platform 10, ramp 11, and second platform 12 together form a flow groove 4.

[0029] It is worth noting that the ramp 11 is arc-shaped. The arc structure can not only control the effective area of ​​the capsule-shaped nozzle together with the second lamination, but also reduce the axial gap between each lamination, thereby improving electromagnetic performance and reducing flow resistance. It can also increase the structural stiffness of the stator core assembly, thereby improving NVH performance.

[0030] The side of the protrusion 8 is provided with a strip groove 13 that communicates with the flow groove 4. The strip sleeve is perpendicular to the axis of the third punch 7. After multiple third punches 7 are stacked, the stop block 9 on the third punch 7 partially blocks the strip groove 13 on the adjacent third punch 7.

[0031] It is worth noting that the effective nozzle area formed between the first type of stamping 5 and the fourth type of stamping is ≥

[0032] The effective nozzle area formed between the fourth blade and the second blade 6 is greater than or equal to the effective nozzle area formed between the second blade 5 and the third blade 7, forming a trumpet-shaped spray effect with a large spray area and good cooling effect.

[0033] The effective spray area can be adjusted by adjusting the width or height of the capsule-shaped nozzle 2, or by adjusting the outer diameter of the arc-shaped structure for transition on the third punch.

[0034] The effective spray area is adjusted based on the cooling flow rate, cooling power, and nozzle spray speed. For internal rotor motors with a stator core outer diameter ≤ 270mm, an effective spray area of ​​0.7mm can be used. 2 -1.5mm2 .

[0035] The number of capsule-shaped nozzles at each end of the stator core is adjusted according to the number of winding slots on the stator core and the wetting effect of the coolant after being sprayed onto the winding ends. For internal rotor motors with a stator core outer diameter ≤ 270mm, the number of nozzles at each end of the stator core can be 8-24. The smaller the stator core outer diameter, the fewer the number of nozzles.

[0036] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A liquid-cooled stator core, characterized in that, The iron core is ring-shaped, and multiple capsule-shaped nozzles are respectively opened on the two surfaces of the iron core. Each pair of capsule-shaped nozzles are connected to form an oil passage. Multiple flow grooves connected to the capsule-shaped nozzles are opened along the circumference of the iron core. The multiple flow grooves are distributed alternately on the side of the iron core in a direction parallel to the axis of the iron core. The iron core includes a first lamination, a second lamination, multiple third laminations, second laminations, and a first lamination stacked in sequence; The first and second stampings are provided with multiple capsule-shaped nozzles on their surfaces, and multiple flow grooves are provided on the sides of the third stampings. The multiple flow grooves are distributed alternately on the sides of the third stampings along a direction parallel to the axis of the third stampings. The overlapping part of the multiple flow grooves forms the oil passage. The third lamination has multiple protrusions spaced apart on its side, and a stop is provided between every two protrusions. The side of each protrusion is provided with a first platform, a ramp, and a second platform in sequence to the adjacent stop. The second platform is closer to the center of the third lamination than the first platform. The protrusions, the stop, the first platform, the ramp, and the second platform together form the flow groove. The side of the protrusion is provided with a strip-shaped groove that communicates with the flow groove. The strip-shaped groove is perpendicular to the axis of the third lamination. After multiple third laminations are stacked, the stop block on the third lamination partially blocks the strip-shaped groove on the adjacent third lamination.

2. The liquid-cooled stator core according to claim 1, characterized in that, The capsule-shaped nozzle is stepped inwards, and the stepped shape is inclined towards the center of the iron core.

3. The liquid-cooled stator core according to claim 1, characterized in that, The thickness of the lamination decreases sequentially from the center towards both ends.

4. An electric motor, characterized in that, Includes the liquid-cooled stator core as described in any one of claims 1-3.

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