Motor rotor structure and electric drive system

Abstract

This application provides a motor rotor structure and electric drive system, including a rotating shaft that accommodates lubricating oil; an iron core assembly sleeved on the rotating shaft, the iron core assembly having a plurality of magnet holes; an end plate assembly including a first end plate and a second end plate, the first end plate and the second end plate sleeved on the rotating shaft, the first end plate being located on one side of the iron core assembly, and the second end plate being located on the other side of the iron core assembly, the first end plate being configured with a first oil inlet, a first oil outlet, and a first reversing part, the second end plate being configured with a second oil inlet, a second oil outlet, and a second reversing part, both the first oil inlet and the second oil inlet being connected to a hollow structure; wherein the first oil inlet, the second reversing part, and the first oil outlet, after being connected to the magnet holes, form a first oil passage, and the second oil inlet, the first reversing part, and the second oil outlet, after being connected to the magnet holes, form a second oil passage. The long cooling circuit improves the cooling effect.

Description

Technical Field

[0001] This application relates to the field of motor technology, and more specifically, to a motor rotor structure and an electric drive system. Background Technology

[0002] In response to the environmental pollution caused by vehicle exhaust, new energy vehicles have emerged to replace traditional internal combustion engine vehicles. As the core driving component of new energy vehicles, the operating efficiency and cost-effectiveness of the drive motor have attracted much attention, and the cooling method of the motor is particularly important to the efficiency and cost-effectiveness of the motor.

[0003] With the current trend of multi-functional new energy drive systems, oil-cooled motors are gradually becoming mainstream. Most existing oil-cooling technologies focus on the stator core and end windings. However, with the increasing speed of drive motors, the temperature of the motor rotor has become a major concern. As the temperature of the rotor core and magnets rises, it reduces magnet performance and increases the risk of magnet demagnetization. Current rotor cooling designs are not effective enough and also increase pressure loss in the system's oil circuit. Summary of the Invention

[0004] The purpose of this application is to provide a motor rotor structure and electric drive system with a long cooling circuit to improve the cooling effect.

[0005] In a first aspect, embodiments of this application provide a motor rotor structure, comprising: a rotating shaft configured as a hollow structure for accommodating lubricating oil; an iron core assembly sleeved on the rotating shaft, wherein the iron core assembly has a plurality of magnetic holes distributed circumferentially thereon; and an end plate assembly including a first end plate and a second end plate, the first end plate and the second end plate being sleeved on the rotating shaft, the first end plate being located on one side of the iron core assembly, and the second end plate being located on the other side of the iron core assembly, the first end plate being configured with a first oil inlet, a first oil outlet, and a first reversing section, the first end plate being configured with a first oil inlet, a first oil outlet, and a first reversing section, the second end plate being configured with a first oil outlet ... second reversing section, the second end plate being configured with a first oil outlet, a first oil outlet, and a second reversing section The two end plates are equipped with a second oil inlet, a second oil outlet, and a second reversing section. The first oil inlet, the first oil outlet, the first reversing section, the second oil inlet, the first oil outlet, and the second reversing section are all connected to the magnet hole, and the first oil inlet and the second oil inlet are both connected to the hollow structure. The first oil inlet, the second reversing section, and the first oil outlet form a first oil passage after being connected to the magnet hole, and the second oil inlet, the first reversing section, and the second oil outlet form a second oil passage after being connected to the magnet hole.

[0006] In the above-mentioned process, both the end plate assembly and the iron core assembly are sleeved on the rotating shaft. The end plate assembly is located outside the iron core assembly, and the rotating shaft is configured as a hollow structure. The iron core assembly is provided with a magnet hole. The first end plate is provided with a first oil inlet, a first oil outlet, and a first reversing part. The second end plate is provided with a second oil inlet, a second oil outlet, and a second reversing part. This allows external lubricating oil to enter the inner cavity of the rotating shaft. Part of the lubricating oil flows to the outside of the first end plate after passing through the first oil channel formed by the first oil inlet, the magnet hole, the second reversing part, and the first oil outlet. At the same time, part of the lubricating oil flows to the outside of the second end plate after passing through the second oil channel formed by the second oil inlet, the magnet hole, the first reversing part, and the second oil outlet. The entire flow process can achieve bidirectional cooling, and the cooling circuit is relatively long, thus improving the cooling effect.

[0007] In some embodiments, the first oil inlet includes a first oil inlet groove, and at least two first oil inlet grooves are configured. The two first oil inlet grooves are symmetrically distributed on the first end plate. Each first oil inlet groove is connected to a magnet hole, and the first oil inlet groove is configured to allow the lubricating oil in the hollow structure to flow through the magnet hole.

[0008] In the above implementation process, at least two first oil inlet grooves are symmetrically arranged on the first end plate, so that when part of the lubricating oil in the inner cavity of the rotating shaft flows to the first end plate, it can flow to the two first oil inlet grooves respectively under the action of centrifugal force. Finally, at least two first oil channels can be formed in the corresponding magnet holes that are connected to them, which can cool different positions of the motor rotor structure. The cooling circuit is relatively long, thereby improving the cooling effect.

[0009] In some embodiments, the first oil inlet groove includes two first arc-shaped sides connected together, such that the size of the end is smaller than the size of the middle.

[0010] In the above implementation process, by setting the end dimension of the first oil inlet groove to be smaller than the middle dimension, the first oil inlet groove can form a streamlined structure, which helps to reduce the resistance of oil flow and thus improve the cooling effect.

[0011] In some embodiments, the first reversing section includes a first reversing groove, and at least two first reversing grooves are configured. The two first reversing grooves are symmetrically distributed on the first end plate. Each first reversing groove is connected to two adjacent magnet holes, and the first reversing groove is configured to reversing the lubricating oil and flowing within the two adjacent magnet holes.

[0012] In the above process, the first reversing groove is used to connect two adjacent magnet holes, so that the lubricating oil enters one of the magnet holes from the first oil inlet groove, and after being reversed by the first reversing groove, it enters the other magnet hole until it flows into the first oil outlet to complete the cooling. Its cooling circuit is relatively long, which improves the cooling effect.

[0013] In some embodiments, the first oil outlet includes a first oil outlet groove, and at least two first oil outlet grooves are configured. The two first oil outlet grooves are symmetrically distributed on the first end plate. Each first oil outlet groove is connected to one of the magnet holes. The first oil outlet groove is configured to discharge lubricating oil flowing through two adjacent magnet holes to the outside of the first end plate.

[0014] In the above process, the first oil outlet groove is set on the first end plate, which can be used to receive the lubricating oil flowing out from the magnet hole and discharge it to the outside of the first end plate. While realizing oil circulation, it can also achieve the cooling effect, thereby improving the performance of the motor rotor structure.

[0015] In some embodiments, the first oil outlet groove includes a first end and a second end, the first end being closer to the center of the first end plate than the second end, and the outer diameter of the first end being larger than the outer diameter of the second end.

[0016] In the above implementation process, by setting the first end and the second end of the first oil outlet groove to have different outer diameters, after the oil enters the first oil outlet groove, the resistance to oil flow can be reduced due to the action of centrifugal force, thereby improving the cooling effect and enhancing the performance of the motor rotor structure.

[0017] In some embodiments, the second oil inlet includes a second oil inlet groove, and at least two second oil inlet grooves are configured. The two second oil inlet grooves are symmetrically distributed on the second end plate. Each second oil inlet groove is connected to a magnetic hole, and the second oil inlet groove is configured to allow the lubricating oil in the hollow structure to flow through the magnetic hole.

[0018] In the above process, at least two second oil inlet grooves are symmetrically arranged on the second end plate, so that when some of the lubricating oil in the inner cavity of the shaft flows to the second end plate, it can flow to the two second oil inlet grooves respectively under the action of centrifugal force. Finally, at least two second oil channels can be formed in the corresponding magnet holes that are connected to them, which can cool different positions of the motor rotor structure. The cooling circuit is relatively long, thereby improving the cooling effect.

[0019] In some embodiments, the second oil inlet groove includes two second arc-shaped sides connected together, such that the size of the end is smaller than the size of the middle.

[0020] In the above implementation process, by setting the end dimension of the second oil inlet groove to be smaller than the middle dimension, the second oil inlet groove can form a streamlined structure, which helps to reduce the resistance of oil flow and thus improve the cooling effect.

[0021] In some embodiments, the second reversing section includes a second reversing groove, and at least two second reversing grooves are configured. The two second reversing grooves are symmetrically distributed on the second end plate. Each second reversing groove is connected to two adjacent magnet holes, and the second reversing groove is configured to reversing the lubricating oil and flowing within the two adjacent magnet holes.

[0022] In the above process, the second reversing groove is used to connect two adjacent magnet holes, so that the lubricating oil enters one of the magnet holes from the second oil inlet groove, and after being reversed by the second reversing groove, it enters the other magnet hole until it flows into the second oil outlet to complete the cooling. Its cooling circuit is relatively long, which improves the cooling effect.

[0023] In some embodiments, the second oil outlet includes a second oil outlet groove, and at least two second oil outlet grooves are configured. The two second oil outlet grooves are symmetrically distributed on the second end plate. Each second oil outlet groove is connected to one of the magnetic steel holes. The second oil outlet groove is configured to discharge lubricating oil flowing through two adjacent magnetic steel holes to the outside of the second end plate.

[0024] In the above process, the second oil outlet groove is set on the second end plate, which can be used to receive the lubricating oil flowing out from the magnet hole and discharge it to the outside of the second end plate. While realizing oil circulation, it can also achieve the cooling effect, thereby improving the performance of the motor rotor structure.

[0025] In some embodiments, the second oil outlet groove includes a third end and a fourth end, the third end being closer to the center of the second end plate than the fourth end, and the outer diameter of the third end being larger than the outer diameter of the fourth end.

[0026] In the above implementation process, by setting the third and fourth ends of the second oil outlet groove to different outer diameters, the resistance to oil flow can be reduced after the oil enters the second oil outlet groove due to the action of centrifugal force, thereby improving the cooling effect and enhancing the performance of the motor rotor structure.

[0027] In some embodiments, the core assembly is provided with a magnetic isolation bridge, the thickness of which is configured to be 0.2 mm to 0.5 mm.

[0028] In the above implementation process, a magnetic isolation bridge is set on the iron core assembly. Compared with the solution of eliminating the magnetic isolation bridge, it can reduce magnetic leakage and improve magnetic field utilization. At the same time, the iron core assembly is a complete outer circle, which can simplify the production process, avoid sharp points, avoid stress concentration problems, and improve the performance of the motor rotor structure.

[0029] In some embodiments, the motor rotor structure further includes a bearing, the shaft is provided with a mounting position configured for assembling the bearing, and the mounting position is configured to be inclined along the direction from the end of the shaft to its center.

[0030] In the above process, by setting the mounting position that matches the bearing to be inclined, when the lubricating oil in the inner cavity of the shaft enters between the bearing and the mounting position, a dynamic oil film can be formed. This not only ensures the stability of the assembly between the bearing and the shaft and supports the motor rotor structure at high speed, but also prevents rusting at the connection between the shaft and the bearing.

[0031] In some embodiments, the motor rotor structure further includes a sheath disposed on the outside of the core assembly, and at least a portion of the sheath extends to the outside of the first end plate and the second end plate.

[0032] In the above implementation process, by placing the sheath on the outside of the core assembly and end plate assembly, the motor rotor structure can be protected to maintain high mechanical strength at high speeds, ensuring the performance of the motor rotor structure.

[0033] Secondly, this application also provides an electric drive system, including a motor rotor structure as described in any of the preceding claims.

[0034] Since the electric drive system provided in the second aspect includes a motor rotor structure, the electric drive system has all the technical effects of the motor rotor structure, which will not be elaborated here.

[0035] Other features and advantages of this disclosure will be set forth in the following description, or some features and advantages may be inferred from the description or determined without doubt, or may be learned by practicing the techniques described above.

[0036] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is an exploded view of the motor rotor structure provided in an embodiment of this application;

[0039] Figure 2 A cross-sectional view of the motor rotor structure provided in an embodiment of this application;

[0040] Figure 3 A cross-sectional view of the motor rotor structure provided in an embodiment of this application;

[0041] Figure 4 This is a partial schematic diagram of the cooling principle of the motor rotor structure provided in the embodiments of this application;

[0042] Figure 5 This is a schematic diagram of the core assembly of the motor rotor structure provided in the embodiments of this application;

[0043] Figure 6 This is a schematic diagram of the end plate assembly of the motor rotor structure provided in the embodiments of this application;

[0044] Figure 7 This is a schematic diagram of the shaft of the motor rotor structure provided in the embodiment of this application.

[0045] Figure Labels

[0046] 10. Rotating shaft; 101. First oil outlet hole; 102. Second oil outlet hole; 20. End plate assembly; 201. First end plate; 2011. First oil inlet groove; 2012. First oil outlet groove; 2013. First reversing groove; 2014. First oil sling hole; 202. Second end plate; 2021. Second oil inlet groove; 2022. Second oil outlet groove; 2023. Second reversing groove; 2024. Second oil sling hole; 30. Core assembly; 301. Rotor core; 302. Magnet hole; 3021. First magnet groove; 3022. Second magnet groove; 303. Magnetic bridge; 40. Bearing; 50. Pressure ring; 60. Sheath. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0048] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0049] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0050] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or a point connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0051] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0052] Example

[0053] High power density is a long-term trend in the development of the electric motor industry. Drive motors with high power density generate significant internal heat, which can affect their lifespan and stability. To control motor temperature, cooling methods such as air cooling, water cooling, and oil cooling are commonly used. Air-cooled motors suffer from drawbacks such as high noise levels and susceptibility to dust interference. Water-cooled motors, using independent water channels, cannot directly cool the stator and rotor inside the motor, and the design of these channels further increases the motor's size. Oil-cooled motors use non-conductive and non-magnetic cooling oil as the cooling medium, achieving more efficient heat exchange through oil channels within the components.

[0054] During the design process, the inventors discovered that the centrifugal force of the rotor in a high-speed IPM motor is large, and the magnetic bridge is prone to breakage. Generally, it is necessary to thicken the magnetic bridge or add a high-strength sheath. At high speeds, the rotor heats up severely, and there is a risk of demagnetization of the magnets. It is necessary to increase rotor cooling. Existing rotor cores have broken the magnetic bridge and wrapped with carbon fiber or added a sheath, which has a complex manufacturing process and the sharp point at the broken magnetic bridge can damage the carbon fiber or sheath. Rotor cooling is mostly done by oil entering from the middle of the core through the oil guide plate and then flowing axially to both sides, and finally being thrown out from the end plate, or oil entering from one end plate and flowing axially along the core and flowing out from the other end plate, which has poor cooling efficiency for the rotor core.

[0055] In view of this, such as Figures 1-7 As shown, in a first aspect, embodiments of this application provide a motor rotor structure, including: a rotating shaft 10, which is configured as a hollow structure for accommodating lubricating oil; an iron core assembly 30, which is sleeved on the rotating shaft 10, and the iron core assembly 30 has a plurality of magnetic steel holes 302 distributed along its circumference; and an end plate assembly 20, including a first end plate 201 and a second end plate 202, the first end plate 201 and the second end plate 202 being sleeved on the rotating shaft 10, the first end plate 201 being located on one side of the iron core assembly 30, and the second end plate 202 being located on the other side of the iron core assembly 30, the first end plate 201 being provided with a first oil inlet... The first oil outlet and the first reversing part are provided. The second end plate 202 is provided with a second oil inlet, a second oil outlet and a second reversing part. The first oil inlet, the first oil outlet, the first reversing part, the second oil inlet, the first oil outlet and the second reversing part are all connected to the magnet hole 302, and the first oil inlet and the second oil inlet are both connected to the hollow structure. The first oil inlet, the second reversing part and the first oil outlet form a first oil passage after being connected to the magnet hole 302, and the second oil inlet, the first reversing part and the second oil outlet form a second oil passage after being connected to the magnet hole 302.

[0056] For example, the rotating shaft 10 is provided with a hollow cavity along its axial direction. The hollow cavity is used to contain lubricating oil that enters the rotating shaft 10 from outside the motor rotor structure. The rotating shaft 10 is provided with a plurality of first oil outlet holes 101. The first oil inlet of the first end plate 201 and the second oil inlet of the second end plate 202 are both connected to the first oil outlet holes 101, so that the lubricating oil in the rotating shaft 10 can enter the first oil inlet and the second oil inlet respectively through the first oil outlet holes 101.

[0057] It is understood that the outer diameter of the core assembly 30, the outer diameter of the first end plate 201, and the outer diameter of the second end plate 202 can be set to be consistent. The core assembly 30 includes a plurality of rotor cores 301, which are fitted together along the axial direction of the rotating shaft 10. For example, six rotor cores 301 are provided. Each rotor core 301 is provided with a plurality of magnet holes 302 along its circumference. Magnet holes 302 at the same axial position are interconnected to form a plurality of magnet channels; wherein each of the magnet holes 302 includes a first magnet groove 3021 and a second magnet groove 3022, the first magnet groove 3021 and the second magnet groove 3022 are spaced apart, and the second magnet groove 3022 is closer to the outer diameter of the rotor core 301 than the first magnet groove 3021; ​​the shapes of the first magnet groove 3021 and the second magnet groove 3022 include, but are not limited to, V-shape.

[0058] In the above-mentioned process, the end plate assembly 20 and the iron core assembly 30 are both sleeved on the rotating shaft 10. The end plate assembly 20 is located outside the iron core assembly 30, and the rotating shaft 10 is set as a hollow structure. The iron core assembly 30 is provided with a magnet hole 302. The first end plate 201 is provided with a first oil inlet, a first oil outlet and a first reversing part. The second end plate 202 is provided with a second oil inlet, a second oil outlet and a second reversing part. After the external lubricating oil enters the inner cavity of the rotating shaft 10, part of the lubricating oil flows to the outside of the first end plate 201 after passing through the first oil channel formed by the first oil inlet, the magnet hole 302, the second reversing part and the first oil outlet in sequence. At the same time, part of the lubricating oil flows to the outside of the second end plate 202 after passing through the second oil channel formed by the second oil inlet, the magnet hole 302, the first reversing part and the second oil outlet in sequence. The entire flow process can achieve bidirectional cooling, and the cooling circuit is longer, which improves the cooling effect.

[0059] like Figure 2 and Figure 6As shown, the first oil inlet includes a first oil inlet groove 2011. At least two first oil inlet grooves 2011 are provided. The two first oil inlet grooves 2011 are symmetrically distributed on the first end plate 201. Each first oil inlet groove 2011 is connected to a magnet hole 302. The first oil inlet groove 2011 is configured to allow the lubricating oil in the hollow structure to flow through the magnet hole 302.

[0060] For example, two first oil inlet grooves 2011 are symmetrically distributed on the first end plate 201, such that the angle between the two first oil inlet grooves 2011 is 180°. The first oil inlet grooves 2011 are located on the side of the first end plate 201 close to the rotor core 301. Each first oil inlet groove 2011 corresponds to a second reversing part (i.e., a second reversing groove 2023) and a first oil outlet part (i.e., a first oil outlet groove 2012). The first oil inlet grooves 2011 and the first oil outlet grooves 2012 are distributed adjacent to each other to form the first oil passage. Therefore, when the lubricating oil in the rotating shaft 10 flows, it can enter the two first oil inlet grooves 2011 respectively, and then flow into the corresponding magnet hole 302. After passing through the second reversing part of the second end plate 202, it passes through the adjacent magnet hole 302 to the first oil outlet part, until the lubricating oil is thrown out of the first end plate 201, completing the cooling of at least two first oil passages.

[0061] In the above implementation process, at least two first oil inlet grooves 2011 are symmetrically arranged on the first end plate 201, so that when part of the lubricating oil in the inner cavity of the rotating shaft 10 flows to the first end plate 201, it can flow to the two first oil inlet grooves 2011 respectively under the action of centrifugal force, and finally form at least two first oil channels in the corresponding magnet holes 302 that are connected to it. This can cool different positions of the motor rotor structure, and the cooling circuit is relatively long, thereby improving the cooling effect.

[0062] Please refer to again Figure 2 and Figure 6 The first oil inlet groove 2011 includes two first arc-shaped sides connected together, such that the size of the end is smaller than the size of the middle. For example, the first oil inlet groove 2011 is configured in a fan-shaped configuration, such that the size of the end of the first oil inlet groove 2011 is smaller than the size of its middle or near-middle position. Each of the first oil inlet grooves 2011 is connected to the first magnet groove 3021 and the second magnet groove 3022 of the magnet hole 302.

[0063] In the above implementation process, by setting the end dimension of the first oil inlet groove 2011 to be smaller than the middle dimension, the first oil inlet groove 2011 can form a streamlined structure, which helps to reduce the resistance of oil flow and thus improve the cooling effect.

[0064] Please refer to again Figure 2 and Figure 6 The first reversing section includes a first reversing groove 2013. At least two first reversing grooves 2013 are configured. The two first reversing grooves 2013 are symmetrically distributed on the first end plate 201. Each first reversing groove 2013 is connected to two adjacent magnet holes 302. Each reversing groove corresponds to a second oil inlet groove 2021 and a second oil outlet groove 2022 to form a second oil passage. The first reversing groove 2013 is configured to reversing the lubricating oil and flows within two adjacent magnet holes 302.

[0065] For example, two first reversing slots 2013 are symmetrically distributed on the first end plate 201, forming a 180° angle between them. The first reversing slots 2013 are located on the side of the first end plate 201 near the rotor core 301. Each second oil inlet corresponds to one first reversing slot 2013. The shape of the first reversing slot 2013 includes, but is not limited to, a trapezoidal slot. Of course, it can also be other shapes, as long as it can connect two adjacent magnet holes 302.

[0066] In the above implementation process, the first reversing groove 2013 is used to connect two adjacent magnet holes 302, so that after the lubricating oil enters one of the magnet holes 302 from the first oil inlet groove 2011, it enters the other magnet hole 302 after being reversed by the first reversing groove 2013, until it flows into the first oil outlet to complete the cooling. Its cooling circuit is relatively long, which improves the cooling effect.

[0067] Please refer to again Figure 2 and Figure 6 The first oil outlet includes a first oil outlet groove 2012. At least two first oil outlet grooves 2012 are provided. The two first oil outlet grooves 2012 are symmetrically distributed on the first end plate 201. Each first oil outlet groove 2012 is connected to a magnetic steel hole 302. The first oil outlet groove 2012 is configured to discharge the lubricating oil flowing through the two adjacent magnetic steel holes 302 to the outside of the first end plate 201.

[0068] For example, the two first oil outlet grooves 2012 are symmetrically distributed on the first end plate 201, and the two first oil outlet grooves 2012 are distributed at 180° to each other, so that the first oil outlet grooves 2012 and the first reversing groove 2013 are distributed at 90°, and the first oil outlet grooves 2012 and the first oil inlet groove 2011 are distributed at 90°.

[0069] In the above implementation process, the first oil outlet groove 2012 is set on the first end plate 201, which can be used to receive the lubricating oil flowing out from the magnet hole 302 and discharge it to the outside of the first end plate 201. While realizing oil circulation, it can also achieve the cooling effect, thereby improving the performance of the motor rotor structure.

[0070] In some embodiments, the first oil outlet groove 2012 includes a first end and a second end, the first end being closer to the center of the first end plate 201 than the second end, and the outer diameter of the first end being larger than the outer diameter of the second end. Exemplarily, the shape of the first oil outlet groove 2012 includes, but is not limited to, a triangle, and the first end plate 201 is provided with a first oil-throwing hole 2014, which corresponds to the second end and is used to throw lubricating oil out of the first end plate 201.

[0071] In the above implementation process, by setting the first end and the second end of the first oil outlet 2012 to have different outer diameters, after the oil enters the first oil outlet 2012, the resistance to oil flow can be reduced due to the action of centrifugal force, thereby improving the cooling effect and enhancing the performance of the motor rotor structure.

[0072] like Figure 2 and Figure 6 As shown, the second oil inlet includes a second oil inlet groove 2021. At least two second oil inlet grooves 2021 are provided, and the two second oil inlet grooves 2021 are symmetrically distributed on the second end plate 202. Each second oil inlet groove 2021 is connected to a magnet hole 302, and the second oil inlet groove 2021 is configured to allow the lubricating oil in the hollow structure to flow through the magnet hole 302.

[0073] For example, two second oil inlet grooves 2021 are symmetrically distributed on the second end plate 202, such that the angle between the two second oil inlet grooves 2021 is 180°. The second oil inlet grooves 2021 are located on the side of the second end plate 202 close to the rotor core 301. Each second oil inlet groove 2021 corresponds to a first reversing part (i.e., the first reversing groove 2013) and a second oil outlet part (i.e., the second oil outlet groove 2022). The second oil inlet grooves 2021 and the second oil outlet grooves 2022 are distributed adjacent to each other to form the second oil passage. Therefore, when the lubricating oil in the rotating shaft 10 flows, it can enter the two second oil inlet grooves 2021 respectively, and then flow into the corresponding magnet hole 302. After passing through the first reversing part of the first end plate 201, it passes through the adjacent magnet hole 302 to the second oil outlet part, until the lubricating oil is thrown out of the second end plate 202, completing the cooling of at least two second oil passages.

[0074] In the above implementation process, at least two second oil inlet grooves 2021 are symmetrically arranged on the second end plate 202, so that when part of the lubricating oil in the inner cavity of the rotating shaft 10 flows to the second end plate 202, it can flow to the two second oil inlet grooves 2021 respectively under the action of centrifugal force, and finally form at least two second oil channels in the corresponding magnet holes 302 that are connected to it. This can cool different positions of the motor rotor structure, and the cooling circuit is relatively long, thereby improving the cooling effect.

[0075] like Figure 2 and Figure 6 As shown, the second oil inlet groove 2021 includes two second arc-shaped sides connected together, such that the size of the end is smaller than the size of the middle. For example, the second oil inlet groove 2021 is configured in a fan-shaped configuration, such that the size of the end of the second oil inlet groove 2021 is smaller than the size of its middle or near-middle position. Each of the second oil inlet grooves 2021 is in communication with the first magnet groove 3021 and the second magnet groove 3022 of the magnet hole 302.

[0076] In the above implementation process, by setting the end dimension of the second oil inlet groove 2021 to be smaller than the middle dimension, the second oil inlet groove 2021 can form a streamlined structure, which helps to reduce the resistance of oil flow and thus improve the cooling effect.

[0077] Please refer to again Figure 2 and Figure 6 The second reversing section includes a second reversing groove 2023. At least two second reversing grooves 2023 are configured. The two second reversing grooves 2023 are symmetrically distributed on the second end plate 202. Each second reversing groove 2023 is connected to two adjacent magnet holes 302. The second reversing groove 2023 is configured to reversing the lubricating oil and flows within the two adjacent magnet holes 302.

[0078] For example, two second reversing slots 2023 are symmetrically distributed on the second end plate 202, and the two second reversing slots 2023 are 180° apart. The second reversing slots 2023 are located on the side of the second end plate 202 near the rotor core 301. Each first oil inlet corresponds to one second reversing slot 2023. The shape of the second reversing slot 2023 includes, but is not limited to, a trapezoidal slot. Of course, it can also be other shapes, as long as it can connect two adjacent magnet holes 302.

[0079] In the above process, the second reversing groove 2023 is used to connect two adjacent magnet holes 302, so that after the lubricating oil enters one of the magnet holes 302 from the second oil inlet groove 2021, it enters the other magnet hole 302 after being reversed by the second reversing groove 2023, until it flows into the second oil outlet to complete the cooling. Its cooling circuit is relatively long, which improves the cooling effect.

[0080] Please refer to again Figure 2 and Figure 6 The second oil outlet includes a second oil outlet groove 2022. At least two second oil outlet grooves 2022 are provided. The two second oil outlet grooves 2022 are symmetrically distributed on the second end plate 202. Each second oil outlet groove 2022 is connected to a magnetic steel hole 302. The second oil outlet groove 2022 is configured to discharge the lubricating oil flowing through the two adjacent magnetic steel holes 302 to the outside of the second end plate 202.

[0081] For example, two second oil outlet grooves 2022 are symmetrically distributed on the second end plate 202, and the two second oil outlet grooves 2022 are distributed at 180° to each other, so that the second oil outlet grooves 2022 and the second reversing groove 2023 are distributed at 90°, and the second oil outlet grooves 2022 and the second oil inlet groove 2021 are distributed at 90°.

[0082] In the above process, the second oil outlet groove 2022 is set on the second end plate 202, which can be used to receive the lubricating oil flowing out from the magnet hole 302 and discharge it to the outside of the second end plate 202. While realizing oil circulation, it can also achieve the cooling effect, thereby improving the performance of the motor rotor structure.

[0083] In some embodiments, the second oil outlet groove 2022 includes a third end and a fourth end, wherein the third end is closer to the center of the second end plate 202 than the fourth end, and the outer diameter of the third end is larger than the outer diameter of the fourth end. Exemplarily, the shape of the second oil outlet groove 2022 includes, but is not limited to, a triangle, and the second end plate 202 is provided with a second oil-throwing hole 2024, which corresponds to the fourth end and is used to throw lubricating oil out of the second end plate 202.

[0084] In the above implementation process, by setting the third and fourth ends of the second oil outlet 2022 to different outer diameters, after the oil enters the second oil outlet 2022, the resistance to oil flow can be reduced due to the centrifugal force, thereby improving the cooling effect and enhancing the performance of the motor rotor structure.

[0085] like Figure 5As shown, the core assembly 30 is equipped with a magnetic isolation bridge 303, the thickness of which is configured to be 0.2mm to 0.5mm, for example, 0.2mm, 0.3mm, 0.4mm, etc. The magnetic isolation bridge 303 is provided at both the first magnet slot 3021 and the second magnet slot 3022 (that is, the distance from the end of the first magnet slot 3021 and the end of the second magnet slot 3022 to the outer diameter of the rotor core 301 is set to 0.2mm to 0.5mm), so that the core assembly 30 is a complete outer circle.

[0086] In the above implementation process, a magnetic isolation bridge 303 is set on the core assembly 30. Compared with the scheme of eliminating the magnetic isolation bridge 303, it can reduce magnetic leakage and improve magnetic field utilization. At the same time, the core assembly 30 is a complete outer circle, which can simplify the production process, avoid sharp points, avoid stress concentration problems, and improve the performance of the motor rotor structure.

[0087] like Figure 1 and Figure 7 As shown, the motor rotor structure also includes a bearing 40, and the shaft 10 is provided with a mounting position, which is configured to assemble the bearing 40, and the mounting position is inclined along the direction from the end of the shaft 10 to its center.

[0088] For example, the mounting position is inclined along the axial direction of the rotating shaft 10, and the outer diameter of the mounting position away from the center of the rotating shaft 10 is smaller than the outer diameter of the mounting position near the center of the rotating shaft 10, so that the mounting position is inclined, and the inclination angle of the mounting position is 0.3° to 0.5°, for example, the inclination angle is set to 0.3°, 0.4°, etc.; of course, the motor rotor structure also includes a pressure ring 50, which is sleeved on the rotating shaft 10 for assembly and clamping between the first end plate 201, the second end plate 202 and the rotor core 301.

[0089] It is understood that the rotating shaft 10 is provided with a plurality of second oil outlet holes 102 corresponding to the position of the bearing 40, and the second oil outlet holes 102 are used to allow the oil in the rotating shaft 10 to flow to the bearing 40.

[0090] In the above implementation process, by setting the mounting position adapted to the bearing 40 to be inclined, when the lubricating oil in the inner cavity of the shaft 10 enters between the bearing 40 and the mounting position, a dynamic oil film can be formed. This not only ensures the stability of the assembly between the bearing 40 and the shaft 10 and supports the motor rotor structure at high speed, but also prevents rusting at the connection between the shaft 10 and the bearing 40.

[0091] like Figure 1 and Figure 3 As shown, the motor rotor structure also includes a sheath 60, which is disposed on the outside of the core assembly 30, and at least a portion of the structure of the sheath 60 extends to the outside of the first end plate 201 and the second end plate 202.

[0092] For example, the material of the sheath 60 includes, but is not limited to, carbon fiber, and the thickness of the sheath 60 is set to 1mm to 2mm, for example, the sheath 60 is set to 1mm, 2mm, etc., and the size of the sheath 60 overlapping the first end plate 201 and the second end plate 202 can be set to 5mm to 7mm, for example, the size is set to 5mm, 6mm, etc.

[0093] In the above implementation process, by setting the sheath 60 on the outside of the core assembly 30 and the end plate assembly 20, the motor rotor structure can be protected to maintain high mechanical strength at high speed, thus ensuring the performance of the motor rotor structure.

[0094] Secondly, this application also provides an electric drive system, including the motor rotor structure described above.

[0095] Since the electric drive system provided in the second aspect includes a motor rotor structure, the electric drive system has all the technical effects of the motor rotor structure, which will not be elaborated here.

[0096] In all embodiments of this application, "large" and "small" are relative terms, "more" and "less" are relative terms, and "upper" and "lower" are relative terms. The embodiments of this application will not elaborate further on the expression of such relative terms.

[0097] It should be understood that the phrases "in this embodiment," "in this application embodiment," or "as an optional implementation" throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in this embodiment," "in this application embodiment," or "as an optional implementation" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0098] In the various embodiments of this application, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0099] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of protection of the claims.

Claims

1. A motor rotor structure, characterized in that, include: A rotating shaft configured as a hollow structure for containing lubricating oil; A core assembly is sleeved on the rotating shaft, and the core assembly has several magnetic holes distributed along its circumference. An end plate assembly includes a first end plate and a second end plate, which are sleeved on the rotating shaft. The first end plate is located on one side of the core assembly, and the second end plate is located on the other side of the core assembly. The first end plate is equipped with a first oil inlet, a first oil outlet, and a first reversing part. The second end plate is equipped with a second oil inlet, a second oil outlet, and a second reversing part. The first oil inlet, the first oil outlet, the first reversing part, the second oil inlet, the first oil outlet, and the second reversing part are all connected to the magnet hole, and the first oil inlet and the second oil inlet are both connected to the hollow structure. The first reversing part includes a first reversing groove, and at least two first reversing grooves are provided. A reversing groove is symmetrically distributed on the first end plate. Each of the first reversing grooves is connected to two adjacent magnet holes. The first reversing groove is configured to reversing the flow of the lubricating oil within the two adjacent magnet holes. The first oil outlet includes a first oil outlet groove. At least two first oil outlet grooves are configured. The two first oil outlet grooves are symmetrically distributed on the first end plate. Each first oil outlet groove is connected to a magnet hole. The first oil outlet groove is configured to discharge the lubricating oil flowing through the two adjacent magnet holes to the outside of the first end plate. The first oil outlet groove includes a first end and a second end. The first end is closer to the center of the first end plate than the second end, and the outer diameter of the first end is larger than the outer diameter of the second end. The first oil inlet, the second reversing part, and the first oil outlet are connected to the magnet hole to form a first oil passage, and the second oil inlet, the first reversing part, and the second oil outlet are connected to the magnet hole to form a second oil passage.

2. The motor rotor structure according to claim 1, characterized in that, The first oil inlet includes a first oil inlet groove, and at least two first oil inlet grooves are configured. The two first oil inlet grooves are symmetrically distributed on the first end plate. Each first oil inlet groove is connected to a magnetic hole, and the first oil inlet groove is configured to allow the lubricating oil in the hollow structure to flow through the magnetic hole.

3. The motor rotor structure according to claim 2, characterized in that, The first oil inlet groove includes two first arc-shaped sides, which are connected so that the size of the end is smaller than the size of the middle part.

4. The motor rotor structure according to claim 1, characterized in that, The second oil inlet includes a second oil inlet groove, and at least two second oil inlet grooves are arranged. The two second oil inlet grooves are symmetrically distributed on the second end plate. Each second oil inlet groove is connected to a magnetic hole, and the second oil inlet groove is configured to allow the lubricating oil in the hollow structure to flow through the magnetic hole.

5. The motor rotor structure according to claim 4, characterized in that, The second oil inlet groove includes two second arc-shaped sides connected together, such that the size of the end is smaller than the size of the middle part.

6. The motor rotor structure according to claim 1, characterized in that, The second reversing section includes a second reversing groove, and at least two second reversing grooves are configured. The two second reversing grooves are symmetrically distributed on the second end plate. Each second reversing groove is connected to two adjacent magnet holes, and the second reversing groove is configured to reversing the lubricating oil and flowing in the two adjacent magnet holes.

7. The motor rotor structure according to claim 1, characterized in that, The second oil outlet includes a second oil outlet groove, and at least two second oil outlet grooves are configured. The two second oil outlet grooves are symmetrically distributed on the second end plate. Each second oil outlet groove is connected to one of the magnetic steel holes. The second oil outlet groove is configured to discharge the lubricating oil flowing through the two adjacent magnetic steel holes to the outside of the second end plate.

8. The motor rotor structure according to claim 7, characterized in that, The second oil outlet groove includes a third end and a fourth end, the third end being closer to the center of the second end plate than the fourth end, and the outer diameter of the third end being larger than the outer diameter of the fourth end.

9. The motor rotor structure according to claim 1, characterized in that, The core assembly is equipped with a magnetic isolation bridge, and the thickness of the magnetic isolation bridge is configured to be 0.2mm to 0.5mm.

10. The motor rotor structure according to any one of claims 1-9, characterized in that, The motor rotor structure also includes a bearing, and the shaft is provided with a mounting position configured for assembling the bearing, and the mounting position is configured to be inclined along the direction from the end of the shaft to its center.

11. The motor rotor structure according to any one of claims 1-9, characterized in that, The motor rotor structure also includes a sheath disposed on the outside of the core assembly, and at least a portion of the sheath extends to the outside of the first end plate and the second end plate.

12. An electric drive system, characterized in that, Includes the motor rotor structure as described in any one of claims 1-11.

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