Magnetic barrier, rotor assembly, electric machine and vehicle

Abstract

The application discloses a magnetic isolation plate, a rotor assembly, a motor and a vehicle, and relates to the technical field of motors. The magnetic isolation plate comprises a body, at least one flow channel and at least one first communication channel, wherein the body is provided with a through hole, the flow channel is located on the radial outer side of the through hole, the through hole and the flow channel are communicated through the first communication channel, and the first communication channel is inclinedly extended in a direction away from the radial line of the through hole along the direction from the inside to the outside in the radial direction of the through hole. According to the magnetic isolation plate, the structure is simple, and installation and use are convenient.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a magnetic shielding plate, rotor assembly, motor, and vehicle. Background Technology

[0002] As a power component, an electric motor generates heat during operation. If this heat is not effectively dissipated, it can lead to high-temperature failure and affect motor performance. Electric motors are typically cooled by air, water, or oil. Oil cooling is generally more effective than water or air cooling.

[0003] In related technologies, the cooling oil in motors using oil cooling only passes through the inside of the shaft. The high thermal resistance between the rotor core and the shaft makes heat transfer difficult, resulting in limited heat removal by the cooling oil and poor heat dissipation efficiency. In addition, the complex cooling structure on the rotor, with many parts and difficult assembly, reduces production efficiency, makes mass production difficult, and limits the large-scale production and application of motors. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of this invention is to provide a magnetic shielding plate that is simple in structure and easy to install and use. When the magnetic shielding plate is used in a motor, it facilitates the cooling of the rotor core, resulting in high heat dissipation efficiency.

[0005] A second objective of this invention is to provide a rotor assembly employing the aforementioned magnetic shielding plate.

[0006] A third objective of this invention is to provide a motor employing the aforementioned magnetic shielding plate or rotor assembly.

[0007] A fourth object of the present invention is to provide a vehicle employing the above-described rotor assembly or motor.

[0008] According to a first aspect of the present invention, a magnetic shielding plate includes: a body having a through hole formed thereon; at least one flow channel; at least one first connecting channel; the flow channel being located radially outside the through hole, the through hole and the flow channel being connected through the first connecting channel, and the first connecting channel extending obliquely in a direction from the inside to the outside along the radial direction of the through hole, the first connecting channel extending obliquely away from the radial line of the through hole.

[0009] The magnetic shielding plate according to embodiments of the present invention has a simple structure and is relatively easy to process and form, effectively reducing the production cost of the magnetic shielding plate and facilitating its large-scale production and application. When the magnetic shielding plate is used in a motor, by forming a flow channel and a first connecting channel extending obliquely in a direction away from the through hole on the magnetic shielding plate, a complete cooling medium circulation loop is formed in the magnetic shielding plate, effectively reducing the flow resistance of the cooling medium, allowing it to flow more smoothly to the heat-generating components, enhancing the heat exchange efficiency between the cooling medium and the heat-generating components, and improving the heat dissipation rate of the cooling system.

[0010] According to some embodiments of the present invention, the inclination angle of the first connecting channel relative to the radial line is α1, wherein α1 satisfies: 30°≤α1≤60°.

[0011] According to some embodiments of the present invention, the inclination direction of the first connecting channel is adapted to be opposite to the rotation direction of the rotor assembly's shaft.

[0012] According to some embodiments of the present invention, the first connecting channel includes: a first channel segment extending radially along the through hole, one end of the first channel segment communicating with the through hole; and a second channel segment, one end of the second channel segment connected to the other end of the first channel segment, the other end of the second channel segment extending obliquely from the inside out in a direction away from the radial line of the through hole.

[0013] According to some embodiments of the present invention, one end of the second channel segment and the other end of the first channel segment have a smooth transition.

[0014] According to some embodiments of the present invention, the flow channel extends circumferentially along the through hole, and there are multiple first connecting channels, which are arranged at intervals along the circumferential direction of the through hole.

[0015] According to some embodiments of the present invention, a plurality of first connecting channels are evenly spaced along the circumference of the through hole, and the tilting direction and tilting angle of the plurality of first connecting channels are the same.

[0016] According to some embodiments of the present invention, there are multiple flow channels, including a first flow channel and a second flow channel arranged sequentially from the inside to the outside along the radial direction of the through hole. The first flow channel and the through hole are connected through a first connecting channel. The body also has at least one second connecting channel, and the second flow channel and the first flow channel are connected through the second connecting channel.

[0017] According to some embodiments of the present invention, the second communicating channel extends obliquely in a direction from the inside to the outside along the radial direction of the through hole, in a direction away from the radial line of the through hole.

[0018] According to some embodiments of the present invention, the inclination angle of the second connecting channel relative to the radial line is α2, wherein α2 satisfies: 30°≤α2≤60°.

[0019] According to some embodiments of the present invention, there are multiple second connecting channels, which are arranged at intervals along the circumference of the through hole, and multiple first connecting channels and multiple second connecting channels are arranged alternately along the circumference of the through hole.

[0020] According to some embodiments of the present invention, the second connecting channel is located downstream of one of the two adjacent first connecting channels along the inclined direction of the first connecting channel.

[0021] According to some embodiments of the present invention, the first connecting channel and the second connecting channel have the same inclination direction; and / or, the inclination angle of the first connecting channel relative to the radial line is smaller than the inclination angle of the second connecting channel relative to the radial line.

[0022] The rotor assembly according to a second aspect of the present invention includes a magnetic shielding plate according to the first aspect of the present invention.

[0023] According to some embodiments of the present invention, the rotor assembly further includes: a rotating shaft having at least one first outlet formed thereon, the magnetic shielding plate being sleeved on the rotating shaft, the first outlet being connected to a first communication channel of the magnetic shielding plate; and a rotor core being sleeved on the rotating shaft, the rotor core having at least one magnetic groove provided thereon, the magnetic shielding plate being located at one end of the rotor core, the magnetic groove being connected to a flow channel of the magnetic shielding plate.

[0024] According to some embodiments of the present invention, the rotor assembly further includes: a magnetic shielding element, the magnetic shielding element being sleeved on the rotating shaft, the magnetic shielding element being located at the other end of the rotor core, at least one flow groove being formed on the side of the magnetic shielding element facing the stator core, the flow groove communicating with the magnet slot, at least one second outlet being formed on the bottom wall of the flow groove, the flow groove communicating with the outside of the rotor assembly through the second outlet.

[0025] According to some embodiments of the present invention, the flow channel includes: a first flow channel, which is connected to a first flow channel of the magnetic shielding plate through the magnet groove; a second flow channel, which is located radially outside the first flow channel and is connected to the first flow channel, and is connected to a second flow channel of the magnetic shielding plate through the magnet groove, and a second outlet is formed on the bottom wall of the second flow channel.

[0026] According to some embodiments of the present invention, the number of the first connecting channels is equal to the number of poles of the rotor.

[0027] The motor according to a third aspect embodiment of the present invention includes a magnetic shielding plate according to the first aspect embodiment described above, or a rotor assembly according to the second aspect embodiment described above.

[0028] According to some embodiments of the present invention, the motor further includes: a stator disposed on the outer periphery of the rotor assembly; a first seal disposed at the end of the stator away from the magnetic shielding plate, wherein a sealing structure is provided on the side of the first seal near the magnetic shielding plate of the rotor assembly, and a gap exists between the sealing structure and the magnetic shielding plate.

[0029] According to some embodiments of the present invention, the cross-sectional area of ​​the sealing structure gradually decreases from the first seal towards the magnetic shield.

[0030] According to some embodiments of the present invention, an air gap is provided between the stator and the rotor assembly, and a fluid outlet is formed at one end of the air gap near the magnetic shield.

[0031] A vehicle according to a fourth aspect of the present invention includes a rotor assembly according to the second aspect of the present invention, or a motor according to the third aspect of the present invention.

[0032] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0033] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a magnetic shielding plate according to an embodiment of the present invention; Figure 2 This is a perspective view of a magnetic shielding plate according to an embodiment of the present invention; Figure 3 This is a perspective view of the magnetic shielding plate from another angle according to an embodiment of the present invention; Figure 4 This is a perspective view of another form of the magnetic shielding plate according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the flow of cooling medium on a magnetic shielding plate according to an embodiment of the present invention; Figure 6 This is a flow diagram of the cooling medium on the magnetic shielding plate according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the shaft of a rotor assembly according to an embodiment of the present invention; Figure 8 This is a perspective view of a magnetic shielding component according to an embodiment of the present invention; Figure 9 This is a perspective view of the magnetic shielding component according to an embodiment of the present invention from another angle; Figure 10 This is a perspective view of another form of the magnetic shielding component according to an embodiment of the present invention; Figure 11 This is a cross-sectional view of a motor according to an embodiment of the present invention; Figure 12 This is a partial schematic diagram of a motor according to an embodiment of the present invention; Figure 13 yes Figure 11 Enlarged view of section A; Figure 14 yes Figure 11 Enlarged view of section B; Figure 15 This is a perspective view of the first sealing element according to an embodiment of the present invention; Figure 16 This is a perspective view of the first seal from another angle according to an embodiment of the present invention; Figure 17 This is a perspective view of the second seal according to an embodiment of the present invention; Figure 18 This is a perspective view of the second seal from another angle according to an embodiment of the present invention; Figure 19 This is a schematic diagram of the cooling path of the motor rotor assembly according to an embodiment of the present invention.

[0034] Figure label: 100. Magnetic shielding plate; 1. Body; 11. Through hole; 12. Flow channel; 121. First flow channel; 122. Second flow channel; 13. First connecting channel; 131. First channel segment; 132. Second channel segment; 14. Second connecting channel; 200. Rotor assembly; 2. Rotating shaft; 21. First outlet; 3. Rotor core; 31. Magnet slot; 4. Magnetic shielding component; 41. Flow channel; 411. Second outlet; 412. First flow channel; 413. Second flow channel; 300. Electric motor; 5. Stator; 51. Winding; 6. First seal; 61. Sealing structure; 62. Gap; 63. Air gap; 64. Fluid outlet; 7. Electronic oil pump; 8. Flow solenoid valve; 9. Oil passage in the housing; 10. Second seal. Detailed Implementation

[0035] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figures 1-3 A magnetic shielding plate 100 according to a first aspect embodiment of the present invention will be described. In the following description of this application, the magnetic shielding plate 100 used in an oil-cooled motor 300 will be used as an example.

[0036] According to a first aspect of the present invention, the magnetic shielding plate 100 includes a body 1.

[0037] Specifically, combined Figure 1 The body 1 has a through hole 11, at least one flow channel 12, and at least one first connecting channel 13. The flow channel 12 is located radially outside the through hole 11, and the through hole 11 and the flow channel 12 are connected by the first connecting channel 13. The first connecting channel 13 extends obliquely from the inside to the outside along the radial direction of the through hole 11, and extends in a direction away from the radial line of the through hole 11. The above-mentioned "at least one" means that there is at least one flow channel 12 and at least one first connecting channel 13, and there may be multiple flow channels 12 and at least one first connecting channel 13.

[0038] For example, in Figure 1 In the example, the body 1 is a single, hollow ring. A central opening forms a circular through-hole 11 penetrating the body 1. When the magnetic shielding plate 100 is used in the motor 300, the through-hole 11 is adapted to be fitted onto the rotating shaft 2 of the rotor assembly 200 of the motor 300. Thus, the through-hole 11 provides an installation position for the magnetic shielding plate 100, allowing it to be accurately installed in the motor 300, facilitating rapid assembly of the motor 300. Simultaneously, the fit between the through-hole 11 and the rotating shaft 2 also serves a positioning function, restricting the axial and radial movement of the magnetic shielding plate 100 and ensuring its stability during motor 300 operation. Furthermore, while meeting the structural strength and magnetic shielding performance requirements of the magnetic shielding plate 100, the central through-hole 11 reduces the material usage of the magnetic shielding plate 100, thereby reducing the weight of the motor 300 and the rotor assembly 200, and improving the overall system's energy efficiency and performance. It should be noted that the inner diameter and shape of the through hole 11 need to be set according to the actual situation, and no specific limitation is made here.

[0039] For example, refer to Figure 1A flow channel 12 is formed between the outer peripheral surface of the magnetic shielding plate 100 and the through hole 11. The through hole 11, the first connecting channel 13, and the flow channel 12 are arranged in sequence from the inside to the outside along the radial direction of the through hole 11. When the magnetic shielding plate 100 is used in the motor 300, the cooling medium (e.g., cooling oil in an oil cooling system) can flow through the shaft 2, the gap 62 between the shaft 2 and the through hole 11 to the first connecting channel 13, and then flow through the first connecting channel 13 into the flow channel 12. During the flow in the flow channel 12, it can flow into the magnet slot 31 on the rotor core 3 of the rotor assembly 200.

[0040] This design serves two purposes. First, the flow channel 12 provides a specific flow path for the cooling medium (e.g., cooling oil in an oil-cooling system). By setting the flow channel 12, the cooling medium flows along the designed route within the magnetic shielding plate 100, ensuring its uniform distribution in the areas requiring cooling, such as inside the rotor core 3 and near the windings 51 of the stator 5 and rotor assembly 200. This effectively removes the heat generated during motor 300 operation, improving cooling efficiency, preventing localized overheating, and thus guaranteeing the performance of the motor 300 and extending its service life. Furthermore, by rationally designing the shape, size, and layout of the flow channel 12, the flow rate and volume of the cooling medium can be optimized, reducing resistance during flow and enhancing the heat exchange efficiency between the cooling medium and the heat-generating components of the motor 300. Second, the flow channel 12 helps to balance the temperature distribution inside the motor 300. Since the heat generation of different parts of the motor 300 may vary, the flow channel 12 can guide the cooling medium to flow preferentially to the area with high heat generation, making the temperature of each part more uniform, avoiding local high temperature points, and thus improving the overall reliability and stability of the motor 300.

[0041] For example, refer to Figure 1 The through-hole 11 and the flow channel 12 are connected by a first connecting channel 13, which extends at an angle. This first connecting channel 13 creates a complete cooling medium flow path within the magnetic shielding plate 100. The angled design of the first connecting channel 13 helps the cooling medium flow more smoothly from the through-hole 11 to the flow channel 12 under the combined action of gravity and oil pump pressure, effectively reducing the resistance of the cooling medium during flow. The medium then flows along the flow channel 12 to heat-generating components such as the rotor core 3, achieving precise cooling and improving cooling efficiency. Furthermore, it allows the cooling medium to form a specific flow path within the motor 300, increasing the contact area and time between the cooling medium and the heat-generating components, thereby more effectively removing heat and improving heat dissipation efficiency.

[0042] The magnetic shielding plate 100 according to embodiments of the present invention has a simple structure and is relatively easy to process and form, effectively reducing the production cost of the magnetic shielding plate 100 and facilitating its large-scale production and application. When the magnetic shielding plate 100 is used in the motor 300, by forming a flow channel 12 and a first connecting channel 13 extending obliquely in a radial direction away from the through hole 11 on the magnetic shielding plate 100, a complete cooling medium circulation loop is formed in the magnetic shielding plate 100, effectively reducing the flow resistance of the cooling medium, allowing it to flow more smoothly to the heat-generating components, enhancing the heat exchange efficiency between the cooling medium and the heat-generating components, and improving the heat dissipation rate of the cooling system.

[0043] According to some embodiments of the present invention, in combination Figures 1-6 The first connecting channel 13 has an inclination angle of α1 relative to the radial line, where α1 satisfies: 30°≤α1≤60°.

[0044] When the inclination angle α1 of the first connecting channel 13 relative to the radial line is greater than 60°, the inclination angle of the first connecting channel 13 is too large. An excessively large inclination angle of the first connecting channel 13 will cause the cooling medium to flow too quickly under gravity, resulting in insufficient contact time between the cooling medium and the heat-generating components of the motor 300, uneven distribution of the cooling medium, and thus reduced cooling efficiency. This prevents the effective removal of heat generated by the motor 300 during operation, affecting the heat dissipation effect of the motor 300. Furthermore, an excessively large inclination angle places higher demands on the structural design and manufacturing process of the magnetic shielding plate 100, which not only increases the production cost of the magnetic shielding plate 100 but may also affect the overall layout and space utilization of the rotor assembly 200. When the inclination angle α1 of the first connecting channel 13 relative to the radial line is less than 30°, the inclination angle of the first connecting channel 13 is too small. The cooling medium lacks sufficient power to flow along the flow channel 12 under gravity, easily leading to a slow flow speed, thus failing to reach the parts requiring cooling in time, affecting the cooling effect. Furthermore, when the cooling medium flow rate in flow channel 12 is slow, it is easily affected by other factors (such as the distribution of the internal magnetic field of the motor 300, component structure, etc.), resulting in uneven distribution and affecting the cooling effect, thereby affecting the overall performance and reliability of the rotor assembly 200. In addition, it also places higher demands on the sealing performance of the cooling system, increasing the risk of system failure.

[0045] Therefore, by setting the inclination angle α1 of the first connecting channel 13 relative to the radial line to satisfy: 30°≤α1≤60°. During the flow of the cooling medium along the flow channel 12, it generally lags behind the rotation direction. When the rotor assembly 200... Figure 5When rotating counterclockwise as shown, the inclined arrangement of the first connecting channel 13 facilitates the flow of the cooling medium, reduces the impact between the cooling medium and the flow channel 12, and allows the radial acceleration of the cooling medium to be smoothly converted into circumferential velocity. Furthermore, the inclination angle of the first connecting channel 13 relative to the radial line effectively reduces cooling medium loss inside the rotor assembly 200, improving cooling efficiency and thus enhancing the operating efficiency of the high-speed motor 300. Additionally, when the cooling medium... Figure 6 As shown in the diagram, the cooling medium is distributed more evenly, resulting in more uniform heat exchange throughout the rotor assembly 200.

[0046] According to some embodiments of the present invention, in combination Figure 1 The inclination direction of the first connecting channel 13 is adapted to be opposite to the rotation direction of the shaft 2 of the rotor assembly 200.

[0047] For example, combining Figure 1 The first connecting channel 13 is inclined clockwise, while the rotor shaft 2 of the rotor assembly 200 rotates counterclockwise. That is, the inclination direction of the first connecting channel 13 is opposite to the rotation direction of the rotor shaft 2 of the rotor assembly 200. With this configuration, when the cooling medium flows from the through hole 11 into the flow channel 12 in the magnetic shielding plate 100, the flow direction of the cooling medium is opposite to the rotation direction of the rotor assembly 200, which increases the relative velocity between the cooling medium and the surface of the rotor assembly 200. This helps to improve the scouring effect of the cooling medium on the rotor assembly 200, thereby more effectively removing heat from the surface of the rotor assembly 200 and enhancing its cooling effect. Simultaneously, this design allows the cooling medium to impact the surface of the winding 51 of the stator 5 at a certain angle when it reaches the winding 51, increasing the contact area and contact time between the cooling medium and the winding 51 of the stator 5, allowing the winding 51 of the stator 5 to be cooled more thoroughly, thereby improving the overall heat dissipation performance of the motor 300. Furthermore, the inclination direction of the first connecting channel 13 and the second connecting channel 14 is opposite to the rotation direction of the rotor assembly 200. This allows the centrifugal force generated by the rotation of the rotor assembly 200 to make the cooling medium more evenly distributed around the rotor assembly 200 and the stator 5, thereby ensuring the uniformity of its cooling.

[0048] According to some embodiments of the present invention, in combination Figure 1 The first connecting channel 13 includes a first channel segment 131 and a second channel segment 132. Specifically, the first channel segment 131 extends radially along the through hole 11, and one end of the first channel segment 131 is connected to the through hole 11. One end of the second channel segment 132 is connected to the other end of the first channel segment 131, and the other end of the second channel segment 132 extends obliquely from the inside to the outside along the radial direction of the through hole 11 in a direction away from the radial line of the through hole 11.

[0049] For example, in Figure 2 In the example, one end of the first channel segment 131 is connected to the through hole 11, and the other end of the first channel segment 131 extends radially along the through hole 11 and is connected to the second channel segment 132. The other end of the second channel segment 132, away from the first channel segment 131, extends obliquely away from the radial line of the through hole 11. That is, the extension direction of the first channel segment 131 is the same as the direction of the radial line of the through hole 11, and the second channel segment 132 extends obliquely away from the radial line of the through hole 11. Moreover, the connection between the first channel segment 131 and the second channel segment 132 is curved and extends, thereby forming a complete first connecting channel 13, allowing the cooling medium to flow smoothly in the flow channel 12.

[0050] This design allows the first connecting channel 13 to facilitate the smooth flow of cooling medium from the rotating shaft 2 onto the main body 1, guiding the cooling medium to distribute it more evenly to the heat-generating components requiring cooling. By rationally designing the angle and shape of the bend, the cooling oil can be selectively distributed according to the heat generation and dissipation requirements of different areas, thereby improving the uniformity of cooling and preventing localized overheating. Furthermore, the inclined extension of the second channel section 132 allows the cooling medium to flow smoothly into the flow channel 12, effectively reducing the flow resistance of the cooling medium. The inclined extension of the first connecting channel 13 better adapts to complex equipment structures, reducing dead zones in the cooling medium flow (dead zones are areas where cooling oil is difficult to reach or where the flow rate is extremely low, and these areas tend to accumulate heat). Moreover, the inclined extension of the first connecting channel 13 effectively increases the contact area and contact time between the cooling medium and the channel wall and surrounding heat-generating components, allowing for more thorough heat transfer between the cooling medium and the heat-generating components, thus improving the heat dissipation effect. It should be noted that the inclined extension of the first connecting channel 13 can be flexibly arranged according to the specific structure and space constraints of the equipment.

[0051] According to some embodiments of the present invention, in combination Figure 1 The aforementioned end of the second channel segment 132 smoothly transitions to the aforementioned other end of the first channel segment 131. For example, in Figure 1 In the example, the connection between the first channel segment 131 and the second channel segment 132 is curved and extended at a certain angle, and the connection is smoothly transitioned, thus forming a complete first connecting channel 13.

[0052] This design, with its smooth transition at the junction of the first channel segment 131 and the second channel segment 132, avoids sharp corners or abrupt changes in the first connecting channel 13, allowing the cooling medium to flow more smoothly, reducing local resistance losses, improving the efficiency of the entire oil cooling system, and reducing energy consumption. The cooling medium flows more steadily through the smoothly transitioned first connecting channel 13, which is beneficial for improving the stability and reliability of equipment operation. Furthermore, the smooth transition between the first channel segment 131 and the second channel segment 132 effectively reduces the impact and wear of the cooling medium on the wall of the first connecting channel 13, lowering the flow resistance of the cooling medium, thereby reducing cooling medium loss and extending the service life of the first connecting channel 13, reducing equipment maintenance costs. It should be noted that the bending angle at the junction of the first channel segment 131 and the second channel segment 132 needs to be set according to the actual situation and is not specifically limited here.

[0053] According to some embodiments of the present invention, in combination Figure 1 The flow channel 12 extends circumferentially along the through hole 11, and there are multiple first connecting channels 13, which are arranged at intervals along the circumferential direction of the through hole 11. In the description of this invention, "multiple" means two or more.

[0054] For example, combining Figure 1 The flow channel 12 is annular, with its center coinciding with the center of the through hole 11, forming a concentric circle internal structure. This allows for a ring-shaped cooling path around the heat-generating component, ensuring the cooling medium is evenly distributed around it and improving cooling efficiency. Taking the motor 300 as an example, the annular flow channel 12 can surround the stator 5 and rotor assembly 200, ensuring sufficient cooling for all parts of the motor 300, including the rotor core 3 and winding 51, thereby improving the overall performance and reliability of the motor 300. Furthermore, the annular extension increases the surface area of ​​the flow channel 12, correspondingly increasing the contact area between the cooling medium and the heat-generating component, which helps improve heat exchange efficiency and enhances heat dissipation. Additionally, the annular structure is simple, easy to process and form, and beneficial for the large-scale production and application of the magnetic shielding plate 100. Figure 2 In the example, there are six first connecting channels 13. The six first connecting channels 13 are arranged at intervals along the circumference of the through hole 11, and the six first connecting channels 13 are distributed in an inclined manner in the counterclockwise direction with the center of the through hole 11 as the center.

[0055] exist Figure 1 and Figure 5In the example, the magnetic shielding plate 100 is provided with six first connecting channels 13. The six first connecting channels 13 are arranged circumferentially around the annular through holes 11. The number of first connecting channels 13 and their arrangement along the outer periphery of the rotating shaft 2 are consistent with the number of first outlets 21 on the rotating shaft 2 and their arrangement along the outer periphery of the rotating shaft 2. The two ends of the six first connecting channels 13 are respectively connected to the through holes 11 and the flow channels 12. Thus, the cooling medium flowing out from the rotating shaft 2 can flow into the flow channels 12 through multiple first connecting channels 13, that is, the cooling medium can flow into the flow channels 12 from various positions around the through holes 11, increasing the amount of cooling medium flowing onto the magnetic shielding plate 100 per unit time, and also improving the flow efficiency of the cooling medium on the magnetic shielding plate 100, thereby improving the heat exchange efficiency of the motor 300.

[0056] Optionally, the cross-sectional shape and size of the first connecting channel 13 are approximately the same as those of the first outlet 21. Furthermore, the positions of the multiple first connecting channels 13 correspond one-to-one with the multiple first outlets 21. This arrangement of multiple first connecting channels 13 facilitates the uniform dispersion of the cooling medium, allowing the cooling medium flowing towards the magnetic shielding plate 100 to exit from different first connecting channels 13, ensuring uniform dispersion of the cooling medium within the flow channels 12 of the magnetic shielding plate 100. Therefore, by setting multiple spaced-apart first connecting channels 13, it is beneficial to uniformly disperse the cooling medium within the magnetic shielding plate 100, avoiding localized temperature differences, thereby improving heat dissipation efficiency and enhancing the consistency and comprehensiveness of the heat dissipation effect. It should be noted that the number, cross-sectional shape, and size of the first connecting channels 13 can be set according to actual conditions, such as the number, cross-sectional shape, and size of the first outlets 21 and the power of the motor 300, etc., and are not specifically limited here.

[0057] According to some embodiments of the present invention, in combination Figure 1 Multiple first connecting channels 13 are evenly spaced along the circumference of the through hole 11, and the tilting direction and tilting angle of the multiple first connecting channels 13 are the same.

[0058] For example, in Figure 1 In the example, the six first connecting channels 13 are equally spaced, and the tilt angle and tilt direction of the six first connecting channels 13 are consistent. This arrangement effectively reduces the complexity of the internal structure of the magnetic shielding plate 100, improves its production efficiency and further enhances its production precision. It also facilitates the uniform dispersion of the cooling medium within the magnetic shielding plate 100, thereby improving the consistency of its heat dissipation effect. Furthermore, since the flow direction and velocity of the cooling medium in the flow channel 12 are basically consistent, the cooling performance of the entire cooling system is more stable. This helps reduce the thermal stress caused by temperature differences in various parts of the magnetic shielding plate 100, reduces the risk of deformation, wear, and failure of the flow channel 12, extends the service life of the magnetic shielding plate 100, and improves the reliability and stability of the cooling system.

[0059] According to some embodiments of the present invention, in combination Figure 1 There are multiple flow channels 12, including a first flow channel 121 and a second flow channel 122 arranged radially from the inside to the outside along the through hole 11. The first flow channel 121 and the through hole 11 are connected by a first connecting channel 13. At least one second connecting channel 14 is also formed on the body 1, and the second flow channel 122 and the first flow channel 121 are connected by the second connecting channel 14. The above-mentioned "at least one" means that there is at least one second connecting channel 14, and there may be multiple second connecting channels.

[0060] For example, in Figure 1 In the example, the magnetic shielding plate 100 has an inner ring first flow channel 121 and an outer ring second flow channel 122. The first flow channel 121 and the second flow channel 122 are arranged radially from the inside to the outside along the through hole 11. The two ends of the second connecting channel 14 are connected to the first flow channel 121 and the second flow channel 122 respectively. When the magnetic shielding plate 100 is used in the motor 300, the cooling medium (e.g., cooling oil in an oil cooling system) can flow through the shaft 2, the gap 62 between the shaft 2 and the through hole 11 to the first connecting channel 13, then through the first connecting channel 13 to the first flow channel 121, and then from the first flow channel 121 to the second flow channel 122 through the second connecting channel 14. During the flow of the medium in the flow channel 12, it can flow to the magnetic slot 31 on the rotor core 3 of the rotor assembly 200.

[0061] Therefore, when the cooling medium flows from the first flow channel 121 to the second connecting channel 14, the cooling medium can flow into the second connecting channel 14 at a suitable flow rate and volume, thereby improving the uniformity of the cooling medium distribution and increasing cooling efficiency. Furthermore, by setting the second connecting channel 14 to extend at an incline away from the radial line of the through hole 11, the incline design of the second connecting channel 14 helps the cooling medium flow more smoothly from the first flow channel 121 to the second flow channel 122 under the combined action of gravity and oil pump pressure, effectively reducing the resistance of the cooling medium during flow. Then, it flows along the flow channel 12 to the heat-generating components such as the rotor core 3, achieving precise cooling and improving cooling efficiency. In addition, it also facilitates the flow of the cooling medium to the outer peripheral edge of the body 1, resulting in a more uniform flow distribution of the cooling medium on the surface of the body 1 and better heat exchange.

[0062] Furthermore, the first flow channel 121 and the second flow channel 122 allow the cooling medium to form different flow paths in different areas of the magnetic shielding plate 100. For example, in some equipment, the heat-generating elements are concentrated in the central area. The first flow channel 121 can directly guide the cooling medium to the vicinity of the heat-generating components, thereby improving the cooling effect of the cooling medium on these critical parts. The second flow channel 122 can effectively cool the surrounding areas of the equipment, ensuring a more uniform temperature distribution throughout the equipment and avoiding local overheating, thus improving the overall efficiency of the cooling system while ensuring the cooling effect. In addition, it allows the cooling medium to be more fully recycled throughout the system. The cooling medium continuously flows and mixes in the inner and outer annular flow channels 12, which can more fully utilize its cooling capacity and reduce the waste of cooling medium. Furthermore, the arrangement of the first flow channel 121 and the second flow channel 122 enhances the fault tolerance of the cooling system, reduces the risk of the entire cooling system failing due to local faults, and improves the stability of the cooling system.

[0063] According to some embodiments of the present invention, in combination Figure 1 The second connecting channel 14 extends obliquely from the radial direction of the through hole 11 from the inside out, and in a direction away from the radial line of the through hole 11. For example, refer to Figure 1 The second connecting channel 14 extends at an angle, forming a certain angle with the radial line of the through hole 11. Thus, by setting the second connecting channel 14 to extend at an angle away from the radial line of the through hole 11, the inclined design of the second connecting channel 14 helps the cooling medium flow more smoothly from the first flow channel 121 to the second flow channel 122 under the combined action of gravity and oil pump pressure, effectively reducing the resistance of the cooling medium during flow. The medium then flows along the flow channel 12 to heat-generating components such as the rotor core 3, achieving precise cooling and improving cooling efficiency. Furthermore, it also facilitates the flow of the cooling medium to the outer periphery of the body 1, resulting in a more uniform distribution of the cooling medium on the surface of the body 1 and better heat exchange.

[0064] According to some embodiments of the present invention, in combination Figure 1 The second connecting channel 14 has an inclination angle of α2 relative to the radial line, where α2 satisfies: 30°≤α2≤60°.

[0065] For example, when the inclination angle α2 of the second connecting channel 14 relative to the radial line is greater than 60°, the inclination angle of the second connecting channel 14 is too large. An excessively large inclination angle of the second connecting channel 14 will cause the cooling medium to flow rapidly into the second flow channel 122 under gravity, resulting in an excessively large flow rate and velocity of the cooling medium in the second flow channel 122. This leads to insufficient contact time with the heat-generating components, preventing adequate heat absorption and reducing cooling efficiency. Furthermore, an excessively large inclination angle of the second connecting channel 14 places higher demands on the structural design and manufacturing process of the magnetic shielding plate 100. This not only increases the production cost of the magnetic shielding plate 100 but may also affect the overall layout and space utilization of the rotor assembly 200. When the inclination angle α2 of the second connecting channel 14 relative to the radial line is less than 30°, the inclination angle of the second connecting channel 14 is too small. The cooling medium lacks sufficient power to flow along the flow channel 12 under gravity, easily resulting in a slow flow velocity, thus failing to reach the parts requiring cooling in a timely manner and affecting the cooling effect. Furthermore, when the cooling medium flows from the first flow channel 121 to the second connecting channel 14, if the inclination angle of the second connecting channel 14 is too small, it will affect the smoothness of the cooling medium flow in the flow channel 12, resulting in differences in the cooling effect of different parts and affecting the overall performance of the equipment.

[0066] Therefore, by setting the inclination angle α2 of the second connecting channel 14 relative to the radial line to satisfy 30°≤α2≤60°, the flow velocity of the cooling medium from the first flow channel 121 to the second flow channel 122 is moderate, allowing the heat-generating components near the second flow channel 122 to be adequately cooled, thereby improving the overall performance and service life of the equipment. Furthermore, the aforementioned inclination angle of the second connecting channel 14 facilitates the smooth flow of the cooling medium between the first and second flow channels 121 and 122, reducing the impact between the cooling medium and the flow channels 12, effectively reducing the loss of the cooling medium, lowering its operating costs, and improving the operational stability of the motor 300.

[0067] According to some embodiments of the present invention, in combination Figure 1 There are multiple second connecting channels 14, which are arranged at intervals along the circumference of the through hole 11. Multiple first connecting channels 13 and multiple second connecting channels 14 are arranged alternately along the circumference of the through hole 11.

[0068] For example, refer to Figure 1The magnetic shielding plate 100 has six second connecting channels 14, and the six first connecting channels 13 and the six second connecting channels 14 are arranged alternately along the circumference of the through hole 11. The cross-sectional area relationship between the multiple first connecting channels 13 and the multiple second connecting channels 14 can be as follows: First, the cross-sectional areas of the multiple first connecting channels 13 and the multiple second connecting channels 14 are equal; second, the cross-sectional area of ​​the multiple first connecting channels 13 is greater than the cross-sectional area of ​​the multiple second connecting channels 14; third, the cross-sectional area of ​​the multiple first connecting channels 13 is less than the cross-sectional area of ​​the multiple second connecting channels 14, etc.

[0069] This arrangement, with multiple staggered first connecting channels 13 and second connecting channels 14, facilitates the flow of cooling medium from the through-hole 11 to the first flow channel 121, and also facilitates the flow of cooling medium from the first flow channel 121 to the second connecting channel 14. This allows for a more uniform distribution of the cooling medium throughout the flow channels 12 of the magnetic shielding plate 100, thereby improving the cooling efficiency. Furthermore, the first connecting channel 13 can deliver the cooling medium to the shaft center near the rotor assembly 200, while the second connecting channel 14 is responsible for cooling the peripheral area of ​​the rotor assembly 200. This staggered arrangement avoids cooling blind spots, ensuring that all parts of the motor 300 or other cooled equipment receive sufficient and uniform cooling, reducing localized overheating and improving the overall performance and reliability of the equipment. Moreover, this arrangement increases the contact area and contact time between the cooling medium and the heat-generating components, allowing the cooling medium to absorb heat more fully during flow, thus improving heat exchange efficiency. For example, in some complex internal structures, such as motors 300 with multi-layer windings 51 or special shapes, the staggered arrangement of the inclined first connecting channel 13 and the second connecting channel 14 oil passages can better adapt to their internal structure, ensuring that the cooling medium can accurately reach each part that needs cooling, thus improving the adaptability and versatility of the magnetic shielding plate 100. It should be noted that the number, cross-sectional area, shape, and arrangement of the first connecting channel 13 and the second connecting channel 14 need to be set according to the actual situation, and are not specifically limited here.

[0070] According to some embodiments of the present invention, in combination Figure 1 The second connecting channel 14 is located downstream of one of the two adjacent first connecting channels 13 along the inclined direction of the first connecting channel 13. For example, in Figure 1 In the example, the second connecting channel 14 is located in one of two adjacent first connecting channels 13, wherein the latter is the downstream one of the two first connecting channels 13 along the cooling medium flow direction. Therefore, combined with... Figure 3When the rotor core 3 is rotating, after the cooling medium flows through the first connecting channel 13 into the first flow channel 121, it can first flow a certain distance along the extension direction of the first flow channel 121, and then flow into one of the two second connecting channels 14 adjacent to the first connecting channel 13, which is closer to the downstream of the cooling medium. This facilitates the flow of the cooling medium on the body 1. Moreover, the layout of the first connecting channel 13 and the second connecting channel 14, combined with the motion state of the rotor core 3, improves the flow efficiency of the cooling medium, thereby improving the heat exchange efficiency. In addition, the flow path of the cooling medium in the flow channel 12 can be shortened, thereby reducing pressure loss during the flow process, which helps to improve the efficiency of the entire oil circuit system and reduce energy consumption. Furthermore, this design allows the oil circuit system to be more compact, which is beneficial for the miniaturization and lightweight design of equipment. For example, in the heat dissipation system of some small electronic products, a compact oil circuit design can free up more space for other components and improve the integration of the product.

[0071] According to some embodiments of the present invention, in combination Figures 1-6 The first connecting channel 13 and the second connecting channel 14 have the same inclination direction. For example, in Figure 5 In the example, after the cooling medium flows into the magnetic shielding plate 100 through the first connecting channel 13, it can be divided into six branches flowing in a counterclockwise direction. After the cooling medium flows into the first flow channel 121 through the first connecting channel 13, it flows into the second flow channel 122 through the second connecting channel 14, thus forming six branches flowing in a counterclockwise direction.

[0072] This configuration, with the first connecting channel 13 and the second connecting channel 14 having the same inclination direction, helps guide the cooling medium to form a uniform flow trend within the magnetic shielding plate 100, reducing mutual interference and turbulence between different branches. This makes the flow of the cooling medium within the magnetic shielding plate 100 smoother, improving the stability and uniformity of the cooling medium flow, thereby better exerting its cooling effect. For example, in the oil cooling system of the motor 300, a uniform oil flow direction allows the cooling oil to be evenly distributed around the stator 5 and rotor assembly 200, avoiding localized insufficient or excessive cooling. Furthermore, due to the smooth flow of the cooling medium, it can make more sufficient contact with the heat-generating components, increasing the efficiency of heat exchange and thus enhancing the heat dissipation effect of the motor 300. In addition, a uniform cooling medium flow direction can reduce its turning and collision within the flow channel 12, thereby reducing the flow resistance of the cooling medium, reducing cooling medium loss, and improving the system's heat dissipation efficiency. In addition, when the inclination directions of the first connecting channel 13 and the second connecting channel 14 are consistent, the design and molding difficulty of the flow channel 12 is lower, which is conducive to improving the production efficiency of the magnetic shielding plate 100, reducing manufacturing costs and errors, and ensuring the dimensional accuracy and quality of the flow channel 12.

[0073] According to some embodiments of the present invention, in combination Figure 1 The inclination angle of the first connecting channel 13 relative to the radial line is smaller than the inclination angle of the second connecting channel 14 relative to the radial line.

[0074] The difference in inclination angle between the first connecting channel 13 and the second connecting channel 14 allows the cooling medium to be more rationally distributed according to different flow resistances and centrifugal forces when flowing through the first flow channel 121 and the second flow channel 122. Preferably, the inclination angle of the first connecting channel 13 is smaller than that of the second connecting channel. For example, in a high-speed rotating device, the centrifugal force of the motor 300 rotor will affect the flow of the cooling medium. The larger inclination angle of the second connecting channel 14 can better utilize the centrifugal force, allowing the cooling medium to flow along the flow channel 12 under the action of the centrifugal force and be evenly distributed at the outer periphery of the body 1. The smaller inclination angle of the first flow channel 121 can balance the effect of the centrifugal force to a certain extent, preventing the cooling medium from flowing excessively to the second flow channel 122, thereby ensuring the cooling effect of the second flow channel 122. Through the above arrangement, the design of the first connecting channel 13 and the second connecting channel 14 is reasonable, which can effectively overcome the adverse effects of centrifugal force and improve the reliability and stability of the cooling system. Furthermore, with a smaller inclination angle in the first flow channel 121, the cooling medium flows at a relatively slower speed, which helps to deliver more cooling medium to the area closer to the shaft center, as the shaft center area typically has higher heat dissipation requirements. Conversely, the larger inclination angle in the outer ring second flow channel 122 results in a faster cooling medium flow rate, enabling the cooling oil to quickly reach the motor 300 or the peripheral areas of the equipment to meet their heat dissipation needs. Additionally, this design reduces the processing difficulty and cost of the magnetic shielding plate without affecting the overall cooling performance of the cooling system, thereby improving its production efficiency.

[0075] The rotor assembly 200 according to a second aspect of the present invention includes the magnetic shielding plate 100 according to the first aspect of the present invention.

[0076] According to an embodiment of the present invention, the rotor assembly 200, by employing the aforementioned magnetic shielding plate 100, effectively improves the heat dissipation effect and enhances the thermal stability of the rotor assembly 200. For example, the rotor assembly 200 can be used in equipment such as a motor 300, a transformer, and an engine compartment.

[0077] According to some embodiments of the present invention, in combination Figure 7 and Figure 11The rotor assembly 200 also includes a rotating shaft 2 and a rotor core 3. Specifically, at least one first outlet 21 is formed on the rotating shaft 2, and a magnetic shielding plate 100 is sleeved on the rotating shaft 2. The first outlet 21 is connected to the first communication channel 13 of the magnetic shielding plate 100. The rotor core 3 is sleeved on the rotating shaft 2, and at least one magnetic groove 31 is provided on the rotor core 3. The magnetic shielding plate 100 is located at one end of the rotor core 3, and the magnetic groove 31 is connected to the flow channel 12 of the magnetic shielding plate 100.

[0078] For example, refer to Figure 11 The magnetic shielding plate 100 is fitted onto the rotating shaft 2 through the central through hole 11. The first outlet 21 is adapted to cooperate with the first connecting channel 13, so that a specific channel is formed between the magnetic shielding plate 100 and the rotating shaft 2, and further cooperates with the axial flow channel 12 of the rotor core 3 to construct a complete cooling medium circulation path. The number of first outlets 21 on the rotating shaft 2 is the same as the number of first connecting channels 13. With this arrangement, on the one hand, the cooperation between the first outlets 21 and the first connecting channels 13 can accurately guide the flow direction of the cooling medium, so that the cooling medium can flow evenly to all parts of the rotor assembly 200 according to the design requirements, improving the consistency of the cooling effect. For example, in an oil cooling system, the cooling medium flows from the rotating shaft 2 through the first outlet 21 to the multiple first connecting channels 13 on the magnetic shielding plate 100, and further flows to the multiple flow channels 12 on the magnetic shielding plate 100, flows into the multiple magnetic steel grooves 31 through the multiple flow channels 12, and finally sprays out, thereby achieving the cooling effect on the rotor core 3. On the other hand, the magnetic shielding plate 100, fitted onto the rotating shaft 2, effectively prevents the internal magnetic field of the rotor assembly 200 from leaking outward through the rotating shaft 2, making the magnetic field more concentrated inside the rotor assembly 200, improving magnetic field utilization, and reducing energy loss caused by magnetic leakage and magnetic interference to surrounding components. Furthermore, it helps optimize the spatial distribution of the magnetic field, making the magnetic flux density waveform of the air gap 63 closer to a sine wave, reducing torque pulsation and electromagnetic vibration noise in the motor 300, and improving the operating performance and stability of the rotor assembly 200.

[0079] The rotating shaft 2, as the core component for the rotation of the rotor assembly 200, is typically a high-precision cylindrical metal shaft. By fitting the rotor core 3 onto the rotating shaft 2, the rotating shaft 2 can be effectively fixed together with other rotor components, such as rotor windings and fans, forming a unified rotating component. Through the tight fit between the rotor core 3 and the rotating shaft 2, the generated electromagnetic torque can be transmitted to the rotating shaft 2, thereby driving the rotating shaft 2 to rotate and realize the power output of the motor 300, driving the external load. When the rotor assembly 200 is running, all components can work together to achieve the electromechanical energy conversion function of the motor 300. Furthermore, the rotor assembly 200 can also obtain stable support through the rotating shaft 2, ensuring that the rotor maintains accurate position and attitude during high-speed rotation, avoiding swaying or deviation, and guaranteeing the normal operation of the motor 300.

[0080] For example, in Figure 11 In the example, the magnetic shielding plate 100 is located at the right end of the rotor core 3 (e.g., Figure 11 (In the left-right direction), the magnetic steel groove 31 is connected to the flow channel 12 of the magnetic shielding plate 100. There are two magnetic steel grooves 31, which are arranged at intervals along the radial direction of the rotor core 3. The two magnetic steel grooves 31 are respectively connected to the first flow channel 121 and the second flow channel 122. For example, in the oil cooling system, the cooling medium flows out from the first outlet 21 of the rotating shaft 2 and flows into the first flow channel 121. Under the action of centrifugal force, it enters the second flow channel 122, and then part of it flows into the magnetic steel groove 31 connected to the first flow channel 121, that is, the inner ring magnetic steel groove 31. The remaining part of the cooling medium flows into the second flow channel 122 under the action of centrifugal force, and finally enters the magnetic steel groove 31 connected to the second flow channel 122, that is, the outer ring magnetic steel groove 31.

[0081] Therefore, on the one hand, the inner and outer magnetic steel slots 31 can respectively hold magnets of different specifications or polarities. By rationally designing the arrangement and magnetization method of the magnets, the magnetic field generated by the rotor can be made more uniform and stable, and an ideal magnetic field distribution can be formed in the air gap 63, thereby improving the performance of the motor 300. For example, in some high-precision motors 300, this optimization of the magnetic field distribution can make the torque ripple of the motor 300 smaller and the operation smoother. The setting of the inner and outer magnetic steel slots 31 and the outer magnetic steel slot 31 increases the installation space of the magnets, allowing more magnets to be installed in the motor 300, thereby effectively increasing the magnetic field strength. Taking the electric vehicle drive motor 300 as an example, when the magnetic field strength of the motor 300 is higher, the power density of the motor 300 will increase accordingly, thereby giving the vehicle better acceleration performance and range. On the other hand, the presence of the magnetic steel slots 31 forms multiple heat dissipation channels, increasing the heat dissipation area of ​​the rotor assembly 200. The cooling medium (such as air or cooling oil) can more fully contact the surface of the rotor assembly 200, carrying away the heat generated by the magnets and the rotor core 3. Especially in high-power motors 300, good heat dissipation is crucial for preventing magnet demagnetization and ensuring the reliability of the motor 300. It should be noted that the shape and size design of the magnet slot 31 must be determined based on the shape of the magnet and the specific design requirements of the motor 300; no specific limitations are made here. For example, common shapes of the magnet slot 31 include rectangular, trapezoidal, and dovetail shapes, but are not limited to these.

[0082] According to some embodiments of the present invention, in combination Figures 8-10The rotor assembly 200 also includes a magnetic shielding element 4, which is sleeved on the rotating shaft 2 and located at the other end of the rotor core 3. At least one flow groove 41 is formed on the side of the magnetic shielding element 4 facing the rotor core 3. The flow groove 41 is connected to the magnetic steel groove 31. At least one second outlet 411 is formed on the bottom wall of the flow groove 41. The flow groove 41 is connected to the outside of the rotor assembly 200 through the second outlet 411.

[0083] For example, combining Figures 8-10 The magnetic shielding component 4 is located on the left side of the rotor core 3, away from the magnetic shielding plate 100, and is fitted onto the rotating shaft 2 through the central through hole 11. Specifically, an inner flow groove 41 is formed on the side of the magnetic shielding component 4 that mates with the rotor core 3. Multiple second outlets 411 are formed on the bottom wall of the flow groove 41. The second outlets 411 are suitable for the cooling medium to flow out from the magnetic shielding component 4, allowing the flow groove 41 to communicate with the outside of the rotor assembly 200, thereby completing the system heat exchange. Thus, the heat exchange medium in the first flow channel 121 and the second flow channel 122 can flow through multiple magnetic grooves 31 and then into the flow groove 41, and then out through the second outlets 411. Therefore, the cooling medium can exchange heat with the rotor core 3 during the flow process, thereby reducing the temperature of the rotor core 3. The magnetic shielding plate 100, the magnetic shielding component 4, and the magnetic steel groove 31 together constitute a complete cooling system, which can achieve the cooling effect on the heat-generating components such as the rotor core 3 and the rotor assembly 200, thereby extending the service life of the heat-generating components such as the rotor core 3 and the rotor assembly 200.

[0084] According to some embodiments of the present invention, in combination Figure 11 The flow channel 41 includes a first flow channel 412 and a second flow channel 413. Specifically, the first flow channel 412 is connected to the first flow channel 121 of the magnetic shielding plate 100 through the magnetic steel groove 31. The second flow channel 413 is located radially outside the first flow channel 412, and is connected to the first flow channel 412. The second flow channel 413 is connected to the second flow channel 122 of the magnetic shielding plate 100 through the magnetic steel groove 31. The second outlet 411 is formed on the bottom wall of the second flow channel 413.

[0085] Specifically, refer to Figure 11 The first flow channel 412 (i.e., the flow channel 41 located inside the magnetic shielding member 4) is connected to the first flow channel 121 of the magnetic shielding plate 100 through the inner ring magnetic steel groove 31. The second flow channel 413 (i.e., the flow channel 41 located inside the magnetic shielding member 4) is connected to the first flow channel 412, and the second flow channel 413 is connected to the second flow channel 122 of the magnetic shielding plate 100 through the magnetic steel groove 31. A plurality of second outlets 411 are formed on the bottom wall of the second flow channel 413.

[0086] The flow process of the cooling medium on the motor 300 in this application is roughly as follows: The electronic oil pump 7 draws the cooling medium through the flow solenoid valve 8 and then through the housing oil passage 9 into the rotating shaft 2. After heat exchange with the rotating shaft 2, the medium flows out from multiple first outlets 21, then into multiple first channel sections 131, and finally into the first flow channel 121 along multiple second channel sections 132. It then flows circumferentially along the first flow channel 121 into multiple second connecting channels 14, and then into the second flow channel 122. Part of the cooling medium in the first flow channel 121 flows through the magnetic groove 31 on the rotor core 3 near its central axis to the first flow groove 412. The cooling medium in the second flow channel 122 flows through the magnetic groove 31 on the rotor core 3 away from its central axis to the second flow groove 413. The cooling medium in the first flow groove 412 flows into the second flow groove 413. The cooling medium in the second flow groove 413 flows out from the second outlet 411. The outflowing cooling medium can cool the winding 51 through the first sealing element 6. That is, the cooling medium flows from the magnetic shielding plate 100 on the right side of the rotor core 3 to the magnetic shielding element 4 on its left side through the magnetic steel groove 31, and flows out through the second outlet 411, completing the heat exchange.

[0087] Therefore, the magnetic shielding plate 100 on the right side of the rotor core 3 and the magnetic shielding component 4 on the left side of the rotor core 3 cooperate to cool multiple components such as the rotor assembly 200, stator 5, and stator winding 51, thereby reducing the probability of insulation damage to the stator 5 and its winding 51 due to overheating and extending the service life of the motor 300. In addition, in the oil cooling system, the cooling oil provides lubrication to some mechanical components inside the motor 300 during its flow. For example, in the bearings and other parts of the motor 300, the cooling oil can reduce friction between components, reduce wear, and improve the service life of mechanical components, thereby improving the overall efficiency of the motor 300.

[0088] According to some embodiments of the present invention, in combination Figure 1 The number of the first connecting channels 13 is equal to the number of poles of the rotor.

[0089] This configuration serves several purposes. First, during motor 300 operation, the number of rotor poles determines the distribution of the magnetic field. Having the same number of first connecting channels 13 as the number of rotor poles allows for more precise cooling cutoff corresponding to the magnetic field distribution, effectively reducing heat generated by concentrated magnetic fields, minimizing localized overheating, and improving the overall performance and reliability of motor 300. Furthermore, each pole corresponds to one first connecting channel 13, ensuring an absolutely uniform distribution of cooling medium to each pole magnet slot 31. This guarantees uniform rotor surface temperature, preventing thermal stress and deformation caused by uneven cooling, and extending the service life of rotor assembly 200. In addition, uniform cooling helps maintain the stability of motor 300's electromagnetic performance, reducing electromagnetic parameter fluctuations caused by temperature changes. Second, the design of the first connecting channels 13 being equal to the number of poles reduces interference from the cooling system on motor 300's electromagnetic performance to a certain extent, ensuring the integrity and stability of the motor 300's magnetic field. This is beneficial for improving motor 300's efficiency and power factor, and reducing electromagnetic noise and vibration. Furthermore, the aforementioned correspondence facilitates the use of standardized processes and molds in the manufacturing of motor 300, thereby improving the production efficiency, reducing production costs, and increasing production precision, thus ensuring product consistency and quality.

[0090] According to a third aspect embodiment of the present invention, the motor 300, combined with Figure 11 This includes the magnetic shielding plate 100 according to the first aspect embodiment above, or the rotor assembly 200 according to the second aspect embodiment above.

[0091] According to embodiments of the present invention, by employing the aforementioned magnetic shielding plate 100 or rotor assembly 200, the rotor oil cooling system of the motor 300 can achieve balanced, stable, and efficient forced oil cooling for each pole and each magnet slot 31 of the motor 300. This results in a balanced, stable, and efficient cooling effect, thereby improving the working efficiency of the motor 300. Furthermore, the cooling system has a simple structure and low production cost. For example, the motor 300 can be used in electric vehicles, automated production lines, aerospace, and other fields.

[0092] According to some embodiments of the present invention, in combination Figure 11 and Figure 12 The motor 300 also includes a stator 5 and a first seal 6. Specifically, the stator 5 is located on the outer periphery of the rotor assembly 200. The first seal 6 is located at the end of the stator 5 away from the magnetic shielding plate 100. A sealing structure 61 is provided on the side of the first seal 6 near the magnetic shielding plate 4 of the rotor assembly 200, and a gap 62 is provided between the sealing structure 61 and the magnetic shielding plate 4.

[0093] For example, refer to Figure 11The stator 5, a stationary part of the motor 300, is annular in shape and located on the outer periphery of the rotor assembly 200, enclosing it. The stator 5 has windings 51, and the first sealing member 6 covers the end of the windings 51 furthest from the magnetic shielding plate 100. Thus, the stator 5 uniformly surrounds the rotor assembly 200, allowing the magnetic field generated by the windings 51 to act more concentratedly on the rotor assembly 200 and creating a more uniform magnetic field in the air gap 63. This reduces magnetic field leakage to the external space, improves magnetic field utilization, and makes the rotor assembly 200 operate more smoothly, thereby improving the efficiency and performance of the motor 300. Furthermore, as an enclosing structure, the stator 5 better insulates itself from the rotor assembly 200, preventing short circuits between the stator 5 and the windings 51 of the rotor assembly 200, thus improving the electrical safety and reliability of the motor 300. In addition, the stator 5 provides stable support and precise positioning for the rotor assembly 200, ensuring that the rotor maintains the correct axial position during rotation, reducing sway and offset, and preventing components on the rotor (such as rotor windings, permanent magnets, etc.) from falling off due to centrifugal force and other factors, which helps to improve the reliability and service life of the motor 300.

[0094] exist Figure 11 and Figure 12 In the example, the stator 5 has a first seal 6 on its left end, i.e., on the side away from the magnetic shielding plate 100. In the cooling system, the first seal 6 prevents the cooling medium flowing from the rotor assembly 200 from leaking from the connection between the stator 5 and other components. Taking the oil-cooled motor 300 as an example, if the seal near the stator 5 is poor, the cooling oil leakage will lead to a decrease in cooling effect. In addition, it can also maintain the pressure stability of the internal cooling system of the motor 300. For example, in some high-pressure cooling systems, the first seal 6 can prevent pressure leakage, ensure that the cooling medium circulates in the system as designed, and ensure the consistency of cooling effect. In addition, the first seal 6 separates the cooling system of the stator 5 from the cold zone system of the rotor assembly 200. For example, the cooling medium of the stator 5 is blocked by the first seal 6 after flowing on the stator 5 and will not flow to the rotor assembly 200.

[0095] The cooling system of motor 300 plans the flow of oil according to the structure and heat generation of stator 5, so that the cooling medium can flow more evenly and smoothly through all parts of stator 5, carry away heat, and improve cooling efficiency.

[0096] Furthermore, a sealing structure 61 is provided on the right side of the first sealing element 6 near the magnetic shielding element 4. This effectively prevents the cooling medium inside the magnetic shielding element 4 from leaking into the stator 5, avoiding oil pollution of the environment. It also reduces the loss of cooling medium and ensures the normal operation of the lubrication and cooling system of the motor 300. In addition, it prevents external dust, impurities, etc. from entering the motor 300, affecting the quality and performance of the cooling medium, thereby protecting the stator 5, rotor, and other components of the motor 300 from corrosion by impurities and extending the service life of the motor 300.

[0097] Furthermore, the motor 300 generates heat during operation, causing thermal expansion of various components. Since the sealing structure 61 and the magnetic shielding component 4 are made of different materials, their coefficients of thermal expansion also differ. The gap 62 between the sealing structure 61 and the magnetic shielding component 4 provides space for them during thermal expansion, preventing mutual compression due to thermal expansion, avoiding failure of the first seal 6 or damage to the magnetic shielding component 4, and ensuring normal operation of the motor 300 under different operating temperatures. In addition, the gap 62 between the first seal 6 and the magnetic shielding component 4 effectively reduces the assembly difficulty of the motor 300, preventing damage or deformation of components due to installation stress, and ensuring the overall structural stability of the motor 300. It should be noted that the size of the gap 62 between the first seal 6 and the magnetic shielding component 4 needs to be set according to actual conditions, and no specific limitation is made here.

[0098] Additionally, the motor 300 also includes a second seal 10, which is located at one end of the stator 5 adjacent to the magnetic shielding plate 100. Figure 11 The second seal 10 is located on the right side of the stator 5 near the magnetic shielding plate 100, and it covers the right end of the winding 51. Therefore, the second seal 10 effectively prevents the cooling medium from leaking from the right side of the stator 5, reducing cooling medium loss and improving cooling efficiency. Furthermore, the second seal 10 separates the cooling system of the stator 5 from the cold zone system of the rotor assembly 200. Working together with the first seal 6, it ensures that the cooling medium flowing on the stator 5 is blocked by the first seal 6 and the second seal 10, preventing it from flowing to the rotor assembly 200.

[0099] According to some embodiments of the present invention, in combination Figures 11-13 The cross-sectional area of ​​the sealing structure 61 gradually decreases from the direction of the first sealing element 6 toward the magnetic shielding element 4.

[0100] For example, in Figure 13 In the example, the cross-sectional area of ​​the sealing structure 61 is from bottom to top (i.e. Figure 11The annular protrusion structure 61 gradually decreases in size (up and down direction) and has a trapezoidal cross-sectional shape. The trapezoidal cross-section of the annular protrusion sealing structure 61 provides a large contact area and sealing length within a limited space. The inclined side of the trapezoid better accommodates the minute deformations and tolerances between the first sealing element 6 and the mating magnetic shielding element 4, reducing stress concentration and improving sealing reliability. Furthermore, the protrusion structure is arranged in a ring around the gap 62 between the first sealing element 6 and the magnetic shielding element 4, ensuring complete circumferential sealing of the gap 62. This continuous annular design effectively prevents oil or gas leakage from the gap 62, forming a complete sealing barrier. This ensures the normal operation of the magnetic shielding element 4 and the cleanliness of the inside of the motor 300, contributing to improved efficiency and reliability of the motor 300 and extending its service life. Moreover, the annular protrusion sealing structure 61 facilitates the assembly and disassembly of the rotor assembly 200, acting as a guide for insertion and removal of the rotor assembly 200. In addition, this annular protrusion sealing structure 61 is relatively simple, easy to manufacture and install, which helps to reduce the production cost of motor 300 and improve its production efficiency. At the same time, it can achieve good sealing function in a limited space, thereby improving the integration of the internal structure of motor 300 and other equipment.

[0101] According to some embodiments of the present invention, in combination Figure 11 There is an air gap 63 between the stator 5 and the rotor assembly 200, and a fluid outlet 64 is formed at one end of the air gap 63 near the magnetic shielding plate 100.

[0102] For example, refer to Figure 11 The air gap 63 is located between the rotor core 3 and the rotor assembly 200 core, forming an annular space surrounding the rotor assembly 200. When the motor 300 is running, the rotor assembly 200 rotates in the magnetic field generated by the stator 5. The air gap 63 is a crucial channel for magnetic field transmission and energy conversion between the stator 5 and the rotor assembly 200. This arrangement allows relative movement between the stator 5 and the rotor assembly 200 while providing a pathway for the magnetic field. Furthermore, the airflow in the air gap 63 can carry away some of the heat generated during motor 300 operation from the surfaces of the rotor assembly 200 and the stator 5, thus providing a certain degree of heat dissipation, preventing overheating, and improving the efficiency and reliability of the motor 300. It should be noted that the size of the air gap 63 needs to be set according to actual conditions, such as the type, power, and speed of the motor 300, to reduce air gap friction loss and ensure the stability and reliability of the motor 300's performance.

[0103] Furthermore, a fluid outlet 64 is formed at the right end of the air gap 63 near the magnetic shielding plate 100. When the motor 300 is running, a large amount of heat is generated in areas such as the stator 5 winding 51 and the rotor assembly 200. The cooling medium absorbs heat as it flows through the rotor assembly 200. When the cooling medium flows into the air gap 63 through the gap 62, the fluid outlet 64 at the right end of the air gap 63 allows the heated cooling medium to flow out, thereby enabling the cooling medium to continuously remove heat and achieve continuous heat exchange and dissipation. In addition, it can also reduce the windage loss of the air gap 63 and improve the heat dissipation efficiency of the motor 300. For example, in a high-power-density electric vehicle drive motor 300, the above-mentioned circulating cooling system can effectively maintain the stability of the motor 300 under high-load operation, prevent the motor 300 from overheating, and improve the heat dissipation efficiency of the motor 300. In addition, in the oil cooling system, the cooling oil circulates inside the motor 300, which not only cools the motor 300, but also lubricates it to a certain extent, reduces mechanical wear, improves the efficiency and reliability of the motor 300, and extends the maintenance cycle and service life of the motor 300.

[0104] A vehicle (not shown) according to a fourth aspect embodiment of the present invention includes a rotor assembly 200 according to the second aspect embodiment described above, or a motor 300 according to the third aspect embodiment described above.

[0105] According to the vehicle of the present invention, by employing the rotor assembly 200 or the motor 300 described above, it is ensured that the cooling medium in the engine can be effectively recycled and reused under different operating conditions of the vehicle, thereby improving the overall performance of the engine cooling system, thereby improving the overall performance of the vehicle, reducing vehicle maintenance costs, and improving vehicle reliability.

[0106] The magnetic shielding plate 100, rotor assembly 200, motor 300, and other components and operations of the vehicle according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0107] Through simulation and experimentation, the rotor oil cooling system of the motor 300 in this embodiment of the present application reduces cooling oil loss by approximately 15% compared to similar motor rotor oil cooling systems in related technologies, reduces magnet temperature rise by approximately 30 degrees Celsius under the same 40,000 rpm 100 kW operating condition, and reduces rotor air gap 63 windage loss by approximately 35%. Furthermore, the rotor oil cooling system design of the motor 300 in this embodiment of the present application can be applied to a 40,000 rpm high-speed motor 300.

[0108] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0109] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0110] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A magnetic shielding plate (100), characterized in that, include: Body (1), on which a through hole (11) is formed; At least one flow channel (12); At least one first connecting channel (13); The flow channel (12) is located radially outside the through hole (11). The through hole (11) and the flow channel (12) are connected by the first connecting channel (13). Along the radial direction of the through hole (11) from the inside to the outside, the first connecting channel (13) extends obliquely in a direction away from the radial line of the through hole (11).

2. The magnetic shielding plate (100) according to claim 1, characterized in that, The first connecting channel (13) has an inclination angle of α1 relative to the radial line, wherein α1 satisfies: 30°≤α1≤60°.

3. The magnetic shielding plate (100) according to claim 1, characterized in that, The tilting direction of the first connecting channel (13) is adapted to be opposite to the rotation direction of the shaft (2) of the rotor assembly (200).

4. The magnetic shielding plate (100) according to claim 1, characterized in that, The first communication channel (13) includes: A first channel segment (131) extends radially along the through hole (11), and one end of the first channel segment (131) is connected to the through hole (11); The second channel segment (132) has one end connected to the other end of the first channel segment (131), and the other end of the second channel segment (132) extends obliquely from the inside to the outside in the radial direction of the through hole (11) toward the radial line away from the through hole (11).

5. The magnetic shielding plate (100) according to claim 4, characterized in that, The second channel segment (132) has a smooth transition between one end and the other end of the first channel segment (131).

6. The magnetic shielding plate (100) according to claim 1, characterized in that, The flow channel (12) extends in a ring shape along the circumference of the through hole (11). There are multiple first connecting channels (13), and the multiple first connecting channels (13) are arranged at intervals along the circumferential direction of the through hole (11).

7. The magnetic shielding plate (100) according to claim 6, characterized in that, The plurality of first connecting channels (13) are evenly spaced along the circumference of the through hole (11), and the tilting direction and tilting angle of the plurality of first connecting channels (13) are the same.

8. The magnetic shielding plate (100) according to any one of claims 1-7, characterized in that, The flow channels (12) are multiple, and the multiple flow channels (12) include a first flow channel (121) and a second flow channel (122) arranged in a radial direction from the inside to the outside along the through hole (11). The first flow channel (121) and the through hole (11) are connected through the first connecting channel (13). The body (1) also has the following: At least one second connecting channel (14) is provided, through which the second flow channel (122) and the first flow channel (121) are connected.

9. The magnetic shielding plate (100) according to claim 8, characterized in that, Along the radial direction of the through hole (11) from the inside out, the second connecting channel (14) extends obliquely toward the radial line away from the through hole (11).

10. The magnetic shielding plate (100) according to claim 9, characterized in that, The second connecting channel (14) has an inclination angle of α2 relative to the radial line, wherein α2 satisfies: 30°≤α2≤60°.

11. The magnetic shielding plate (100) according to claim 8, characterized in that, There are multiple second connecting channels (14), and the multiple second connecting channels (14) are arranged at intervals along the circumference of the through hole (11). The multiple first connecting channels (13) and the multiple second connecting channels (14) are arranged alternately along the circumference of the through hole (11).

12. The magnetic shielding plate (100) according to claim 11, characterized in that, The second connecting channel (14) is adjacent to one of the two adjacent first connecting channels (13) located downstream along the inclined direction of the first connecting channel (13).

13. The magnetic shielding plate (100) according to claim 7, characterized in that, The first connecting channel (13) and the second connecting channel (14) have the same inclination direction; and / or, The first connecting channel (13) has a smaller tilt angle relative to the radial line than the second connecting channel (14) has a smaller tilt angle relative to the radial line.

14. A rotor assembly (200), characterized in that, Includes the magnetic shielding plate (100) according to any one of claims 1-13.

15. The rotor assembly (200) according to claim 14, characterized in that, Also includes: A rotating shaft (2) has at least one first outlet (21) formed on it. A magnetic shielding plate (100) is sleeved on the rotating shaft (2). The first outlet (21) is connected to the first communication channel (13) of the magnetic shielding plate (100). The rotor core (3) is sleeved on the rotating shaft (2). At least one magnetic steel groove (31) is provided on the rotor core (3). The magnetic shielding plate (100) is located at one end of the rotor core (3). The magnetic steel groove (31) is connected to the flow channel (12) of the magnetic shielding plate (100).

16. The rotor assembly (200) according to claim 15, characterized in that, Also includes: A magnetic shielding component (4) is sleeved on the rotating shaft (2). The magnetic shielding component (4) is located at the other end of the rotor core (3). At least one flow groove (41) is formed on the side of the magnetic shielding component (4) facing the stator (5) core. The flow groove (41) is connected to the magnet groove (31). At least one second outlet (411) is formed on the bottom wall of the flow groove (41). The flow groove (41) is connected to the outside of the rotor assembly (200) through the second outlet (411).

17. The rotor assembly (200) according to claim 16, characterized in that, The flow channel (41) includes: The first flow channel (412) is connected to the first flow channel (121) of the magnetic shielding plate (100) through the magnetic steel channel (31); The second flow channel (413) is located radially outside the first flow channel (412). The second flow channel (413) is connected to the first flow channel (412). The second flow channel (413) is connected to the second flow channel (122) of the magnetic shielding plate (100) through the magnetic steel groove (31). The second outlet (411) is formed on the bottom wall of the second flow channel (413).

18. The rotor assembly (200) according to any one of claims 14-17, characterized in that, The number of the first connecting channels (13) is equal to the number of poles of the rotor core (3).

19. An electric motor (300), characterized in that, It includes a magnetic shielding plate (100) according to any one of claims 1-13, or a rotor assembly (200) according to any one of claims 14-18.

20. The motor (300) according to claim 19, characterized in that, Also includes: Stator (5), said stator (5) is disposed on the outer periphery of said rotor assembly (200); The first seal (6) is located at the end of the stator (5) away from the magnetic shield (100). The first seal (6) has a sealing structure (61) on the side of the magnetic shield (4) near the rotor assembly (200). There is a gap (62) between the sealing structure (61) and the magnetic shield (4).

21. The motor (300) according to claim 20, characterized in that, The cross-sectional area of ​​the sealing structure (61) gradually decreases from the direction of the first seal (6) toward the magnetic shield (4).

22. The motor (300) according to claim 20, characterized in that, There is an air gap (63) between the stator (5) and the rotor assembly (200), and a fluid outlet (64) is formed at one end of the air gap (63) near the magnetic shield (100).

23. A vehicle, characterized in that, It includes a rotor assembly (200) according to any one of claims 14-18, or a motor (300) according to any one of claims 19-22.

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