Motor rotor structure and electric driving system

Abstract

The embodiment of the invention provides a motor rotor structure and an electric driving system. The motor rotor structure comprises a rotating shaft for accommodating lubricating oil; the iron core group sleeves the rotating shaft, and a plurality of magnetic steel holes are distributed in the iron core group; the end plate assembly comprises a first end plate and a second end plate, the first end plate and the second end plate are arranged on the rotating shaft in a sleeving mode, the first end plate is located on one side of the iron core set, the second end plate is located on the other side of the iron core set, and the first end plate is provided with a first oil inlet part, a first oil outlet part and a first reversing part. The second end plate is provided with a second oil inlet part, a second oil outlet part and a second reversing part, and the first oil inlet part and the second oil inlet part are both communicated with the hollow structure; wherein the first oil inlet part, the second reversing part and the first oil outlet part are communicated with the magnetic steel hole to form a first oil duct, and the second oil inlet part, the first reversing part and the second oil outlet part are communicated with the magnetic steel hole to form a second oil duct. A cooling loop is long, and the cooling effect is improved.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a motor rotor structure and an electric drive system. Background Art

[0002] Faced with the environmental pollution caused by motor vehicle exhaust, new energy vehicles have emerged to replace traditional internal combustion locomotives. 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 all-in-one new energy drive systems, oil-cooled motors are gradually becoming mainstream. Most of the existing oil cooling technologies are centered around the stator core and end windings, but with the trend of high-speed drive motors, the temperature of the motor rotor has also become a focus of attention. As the temperature of the rotor core and magnets rises, the performance of the magnets is reduced on the one hand, and the risk of magnet demagnetization is increased on the other. The existing design of rotor cooling does not have a good cooling effect on the rotor, and also increases the pressure loss of the system oil circuit. Summary of the invention

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

[0005] In a first aspect, an embodiment of the present application provides a motor rotor structure, comprising: a rotating shaft, which is configured as a hollow structure, and the hollow structure is used to contain lubricating oil; an iron core group, which is sleeved on the rotating shaft, and the iron core group has a plurality of magnetic steel holes distributed along its circumference; an end plate assembly, comprising a first end plate and a second end plate, the first end plate and the second end plate are sleeved on the rotating shaft, the first end plate is located on one side of the iron core group, and the second end plate is located on the other side of the iron core group, the first end plate is configured with a first oil inlet portion, a first oil outlet portion and a first reversing portion, and the first end plate is configured with a first oil outlet portion and a first reversing portion. The two end plates are 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 magnetic steel hole, and the first oil inlet and the second oil inlet are both connected to the hollow structure; wherein the first oil inlet, the second reversing part and the first oil outlet are connected to the magnetic steel 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 magnetic steel hole to form a second oil passage.

[0006] In the above-mentioned implementation process, the end plate assembly and the core group are both sleeved on the rotating shaft, the end plate assembly is located on the outside of the core group, and the rotating shaft is set to a hollow structure, the core group is provided with a magnetic steel hole, the first end plate is provided with a first oil inlet, a first oil outlet and a first reversing part, and the second end plate is provided with a second oil inlet, a second oil outlet and a second reversing part, so that after the external lubricating oil enters the inner cavity of the rotating shaft, part of the lubricating oil passes through the first oil inlet, the magnetic steel hole, the second reversing part and the first oil outlet The first oil channel formed, flows to the outside of the first end plate, and at the same time, part of the lubricating oil passes through the second oil inlet, the magnetic steel hole, the first reversing part and the second oil outlet The second oil channel formed, flows to the outside of the second end plate. The entire flow process can realize two-way cooling, the cooling circuit is longer, and the cooling effect is improved.

[0007] In some embodiments, the first oil inlet portion includes a first oil inlet groove, and at least two of the first oil inlet grooves are configured, and the two first oil inlet grooves are symmetrically distributed on the first end plate, each of the first oil inlet grooves is connected to one of the magnetic steel holes, and the first oil inlet grooves are configured to allow the lubricating oil in the hollow structure to flow through the magnetic steel hole.

[0008] In the above-mentioned 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, and finally enter the corresponding magnetic steel holes connected thereto, thereby forming at least two first oil channels, which can cool different positions of the motor rotor structure, and the cooling circuit is longer, thereby improving the cooling effect.

[0009] In some embodiments, the first oil inlet groove includes two first arcuate edges, and the two first arcuate edges are connected so that the size of the end portion is smaller than the size of the middle portion.

[0010] In the above implementation process, by setting the end size of the first oil inlet groove to be smaller than the middle size, the first oil inlet groove can form a streamlined structure, which is beneficial to reducing the resistance of oil flow and thus improving the cooling effect.

[0011] In some embodiments, the first reversing portion includes a first reversing groove, and there are at least two first reversing grooves, and the two first reversing grooves are symmetrically distributed on the first end plate, each of the first reversing grooves is connected to the two adjacent magnetic steel holes, and the first reversing groove is configured to reverse the lubricating oil and flow in the two adjacent magnetic steel holes.

[0012] In the above-mentioned implementation process, the first reversing groove is used to connect the two adjacent magnetic steel holes, so that the lubricating oil enters one of the magnetic steel holes from the first oil inlet groove, and then enters the other magnetic steel hole after reversing the first reversing groove, until it flows into the first oil outlet to complete the cooling. The cooling circuit is longer, which improves the cooling effect.

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

[0014] In the above implementation process, the first oil outlet groove is arranged on the first end plate, which can be used to receive the lubricating oil flowing out of the magnetic steel hole and discharge it to the outside of the first end plate, so as to realize oil circulation and cooling effect at the same time, 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 is closer to the center of the first end plate than the second end, and an outer diameter of the first end is greater than an 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 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 improving the performance of the motor rotor structure.

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

[0018] In the above-mentioned implementation process, at least two second oil inlet grooves are symmetrically arranged on the second end plate, so that when part of the lubricating oil in the inner cavity of the rotating shaft flows to the second end plate, it can flow to the two second oil inlet grooves respectively under the action of centrifugal force, and finally enter the corresponding magnetic steel holes connected thereto, thereby forming at least two second oil channels, which can cool different positions of the motor rotor structure, and the cooling circuit is longer, thereby improving the cooling effect.

[0019] In some embodiments, the second oil inlet groove includes two second arcuate sides, and the two second arcuate sides are connected so that the size of the end portion is smaller than the size of the middle portion.

[0020] In the above implementation process, by setting the end size of the second oil inlet groove to be smaller than the middle size, the second oil inlet groove can form a streamlined structure, which is beneficial to reducing the resistance of oil flow and thus improving the cooling effect.

[0021] In some embodiments, the second reversing portion includes a second reversing groove, and there are at least two second reversing grooves, and the two second reversing grooves are symmetrically distributed on the second end plate, each of the second reversing grooves is connected to the two adjacent magnetic steel holes, and the second reversing groove is configured to reverse the lubricating oil and flow in the two adjacent magnetic steel holes.

[0022] In the above-mentioned implementation process, the second reversing groove is used to connect the two adjacent magnetic steel holes, so that the lubricating oil enters one of the magnetic steel holes from the second oil inlet groove, and then enters the other magnetic steel hole after reversing the second reversing groove, until it flows into the second oil outlet to complete the cooling. The cooling circuit is longer, which improves the cooling effect.

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

[0024] In the above implementation process, the second oil outlet groove is arranged on the second end plate, which can be used to receive the lubricating oil flowing out of the magnetic steel hole and discharge it to the outside of the second end plate, so as to realize oil circulation and cooling effect at the same time, 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 is closer to the center of the second end plate than the fourth end, and an outer diameter of the third end is greater than an outer diameter of the fourth end.

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

[0027] In some embodiments, the core group is configured with a magnetic isolation bridge, and the thickness of the magnetic isolation bridge 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 core group. Compared with the solution of canceling the magnetic isolation bridge, it can reduce leakage magnetic field and improve the utilization rate of the magnetic field. At the same time, the core group 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 also includes a bearing, and the rotating shaft is configured with a mounting position, which is configured to assemble the bearing, and the mounting position is configured to be inclined along the end of the rotating shaft to its center.

[0030] In the above implementation process, by setting the mounting position matched with the bearing to an inclined shape, a dynamic oil film can be formed when the lubricating oil in the inner cavity of the shaft enters between the bearing and the mounting position, which can not only ensure the stability of the assembly between the bearing and the shaft and realize the support of the motor rotor structure at high speed, but also avoid rust at the connection between the shaft and the bearing.

[0031] In some embodiments, the motor rotor structure further includes a sheath, which is 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 arranging the sheath on the outside of the core assembly and the end plate assembly, the motor rotor structure can be protected to maintain a high mechanical strength at high speed, thereby ensuring the performance of the motor rotor structure.

[0033] In a second aspect, the present application also provides an electric drive system, comprising a motor rotor structure as described in any one of the above items.

[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 described in detail here.

[0035] Other features and advantages of the present disclosure will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by implementing the above-mentioned technology of the present disclosure.

[0036] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 An exploded schematic diagram of a motor rotor structure provided in an embodiment of the present application;

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

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

[0041] Figure 4 A schematic diagram of a partial cooling principle of a motor rotor structure provided in an embodiment of the present application;

[0042] Figure 5 A schematic structural diagram of an iron core assembly of a motor rotor structure provided in an embodiment of the present application;

[0043] Figure 6 A schematic structural diagram of an end plate assembly of a motor rotor structure provided in an embodiment of the present application;

[0044] Figure 7 A schematic structural diagram of the rotating shaft of the motor rotor structure provided in an embodiment of the present application.

[0045] Reference numerals

[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-throwing hole; 202. Second end plate; 2021. Second oil inlet groove; 2022. Second oil outlet groove; 2023. Second reversing groove; 2024. Second oil-throwing hole; 30. Core assembly; 301. Rotor core; 302. Magnetic steel hole; 3021. First magnetic steel groove; 3022. Second magnetic steel groove; 303. Magnetic isolation bridge; 40. Bearing; 50. Pressure ring; 60. Sleeve. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0048] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0049] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0050] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or a point connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0051] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0052] Example

[0053] High power density is a long-term trend in the development of the motor field. Drive motors with high power density will generate high heat inside, which will affect the service life and stability of the motor. In order to achieve temperature control of the motor, air cooling, water cooling and oil cooling are often used in the motor. Among them, air-cooled motors have disadvantages such as high noise and susceptibility to dust interference; water-cooled motors use independent water channels and cannot directly cool the stator and rotor inside the motor, and the design of the water channel further increases the size of the motor; for oil-cooled motors, non-conductive and non-magnetic cooling oil is used as the cooling medium, and by setting oil channels inside the device, more efficient heat exchange can be achieved in the motor.

[0054] During the design process, the inventor found that the centrifugal force of the high-speed IPM motor rotor is relatively large, and the magnetic isolation bridge is easy to break. It is generally necessary to thicken the magnetic isolation bridge or add a high-strength sheath. The rotor heats up seriously at high speed, and there is a risk of demagnetization of the magnetic steel. It is necessary to increase rotor cooling. The existing rotor core disconnects the magnetic isolation bridge and wraps carbon fiber or adds a sheath, which has a complicated production process, and there are sharp points at the disconnection of the magnetic isolation bridge, which damages the carbon fiber or the sheath; the rotor is cooled mostly by oil entering from the middle of the core through the oil guide plate and then flowing axially to both sides, and finally thrown out from the end plate, or oil enters from one end plate and flows along the axial direction of the core and flows out from the other end plate, which has poor cooling efficiency for the rotor core.

[0055] In view of this, if Figure 1-Figure 7 As shown, in the first aspect, the embodiment of the present application provides a motor rotor structure, including: a rotating shaft 10, which is configured as a hollow structure, and the hollow structure is used to contain lubricating oil; a core group 30, which is sleeved on the rotating shaft 10, and the core group 30 has a plurality of magnetic steel holes 302 distributed along its circumference; 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 are sleeved on the rotating shaft 10, the first end plate 201 is located on one side of the core group 30, and the second end plate 202 is located on the other side of the core group 30, and the first end plate 201 is configured with a first oil inlet portion, The first oil outlet and the first reversing part, 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 magnetic steel hole 302, and the first oil inlet and the second oil inlet are both connected to the hollow structure; wherein the first oil inlet, the second reversing part and the first oil outlet are connected to the magnetic steel hole 302 to form a first oil passage, and the second oil inlet, the first reversing part and the second oil outlet are connected to the magnetic steel hole 302 to form a second oil passage.

[0056] Exemplarily, the rotating shaft 10 is configured with a hollow cavity along its axial direction, and the hollow cavity is used to accommodate lubricating oil entering the rotating shaft 10 from the outside of the motor rotor structure, and the rotating shaft 10 is provided with a plurality of first oil outlet holes 101, and the first oil inlet part of the first end plate 201 and the second oil inlet part 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 part and the second oil inlet part respectively through the first oil outlet holes 101.

[0057] It can be understood that the outer diameter of the core group 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 group 30 includes a plurality of rotor cores 301, and the plurality of rotor cores 301 are mutually attached along the axial direction of the rotating shaft 10. For example, six rotor cores 301 are provided, and each of the rotor cores 301 is provided with a plurality of magnetic steel holes 302 along its circumferential direction, and the plurality of rotor cores 301 are arranged at The magnetic steel holes 302 at the same axial position are interconnected to form a plurality of magnetic steel channels; wherein each of the magnetic steel holes 302 includes a first magnetic steel slot 3021 and a second magnetic steel slot 3022, wherein the first magnetic steel slot 3021 and the second magnetic steel slot 3022 are spaced apart from each other, and the second magnetic steel slot 3022 is closer to the outer diameter of the rotor core 301 than the first magnetic steel slot 3021, and the shapes of the first magnetic steel slot 3021 and the second magnetic steel slot 3022 include but are not limited to V-shape.

[0058] In the above-mentioned implementation process, the end plate assembly 20 and the core group 30 are both sleeved on the rotating shaft 10, the end plate assembly 20 is located on the outside of the core group 30, and the rotating shaft 10 is set to a hollow structure, the core group 30 is provided with a magnetic steel hole 302, the first end plate 201 is provided with a first oil inlet, a first oil outlet and a first reversing part, and the second end plate 202 is provided with a second oil inlet, a second oil outlet and a second reversing part, so that after the external lubricating oil enters the inner cavity of the rotating shaft 10, part of the lubricating oil passes through the first oil inlet, the magnetic steel hole 302, the second reversing part and the first oil outlet The first oil channel formed, flows to the outside of the first end plate 201, and at the same time, part of the lubricating oil passes through the second oil inlet, the magnetic steel hole 302, the first reversing part and the second oil outlet The second oil channel formed, flows to the outside of the second end plate 202. The entire flow process can realize two-way cooling, the cooling circuit is longer, and the cooling effect is improved.

[0059] like Figure 2 and Figure 6As shown, the first oil inlet portion includes a first oil inlet groove 2011, and the first oil inlet groove 2011 is configured with at least two, and the two first oil inlet grooves 2011 are symmetrically distributed on the first end plate 201, each of the first oil inlet grooves 2011 is connected to one of the magnetic steel holes 302, and the first oil inlet grooves 2011 are configured to allow the lubricating oil in the hollow structure to flow through the magnetic steel hole 302.

[0060] Exemplarily, the two first oil inlet grooves 2011 are symmetrically distributed on the first end plate 201 so that the angle between the two first oil inlet grooves 2011 is 180°, and the first oil inlet grooves 2011 are located on the side of the first end plate 201 close to the rotor core 301, and each of the first oil inlet grooves 2011 corresponds to a second reversing portion (i.e., the second reversing groove 2023) and a first oil outlet portion (i.e., the first oil outlet groove 2012), and the first oil inlet groove 2011 and the first oil outlet groove 2012 are adjacent to each other to form the first oil channel, so that 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 magnetic steel hole 302, pass through the second reversing portion of the second end plate 202, and then pass through the adjacent magnetic steel hole 302 to the first oil outlet portion, until the lubricating oil is thrown out of the first end plate 201, completing the cooling of at least two first oil channels.

[0061] In the above-mentioned 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 enter the corresponding magnetic steel holes 302 connected thereto, thereby forming at least two first oil channels, which can cool different positions of the motor rotor structure, and the cooling circuit is longer, thereby improving the cooling effect.

[0062] Please refer to Figure 2 and Figure 6 The first oil inlet groove 2011 includes two first arcuate edges, and the two first arcuate edges are connected so that the size of the end portion is smaller than the size of the middle portion. Exemplarily, the first oil inlet groove 2011 is configured as a fan blade shape, so that the size of the end portion of the first oil inlet groove 2011 is smaller than the size of the middle portion or the position close to the middle portion, and each of the first oil inlet grooves 2011 is connected to the first magnetic steel groove 3021 and the second magnetic steel groove 3022 of the magnetic steel hole 302.

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

[0064] Please refer to Figure 2 and Figure 6 The first reversing portion includes a first reversing groove 2013, and the first reversing groove 2013 is configured with at least two, and the two first reversing grooves 2013 are symmetrically distributed on the first end plate 201, and each of the first reversing grooves 2013 is connected to the two adjacent magnetic steel holes 302, and one reversing groove corresponds to one second oil inlet groove 2021 and one second oil outlet groove 2022 to form the second oil channel, and the first reversing groove 2013 is configured to reverse the lubricating oil and flow in the two adjacent magnetic steel holes 302.

[0065] Exemplarily, the two first reversing grooves 2013 are symmetrically distributed on the first end plate 201, and the angle between the two first reversing grooves 2013 is 180°. The first reversing groove 2013 is located on the side of the first end plate 201 close to the rotor core 301, and each of the second oil inlet portions corresponds to a first reversing groove 2013, wherein the shape of the first reversing groove 2013 includes but is not limited to a trapezoidal groove, and of course it can also be other shapes, as long as it is able to connect the two adjacent magnetic steel holes 302.

[0066] In the above-mentioned implementation process, the first reversing groove 2013 is used to connect the two adjacent magnetic steel holes 302, so that the lubricating oil enters one of the magnetic steel holes 302 from the first oil inlet groove 2011, and then enters the other magnetic steel hole 302 after reversing the first reversing groove 2013, until it flows into the first oil outlet to complete the cooling. The cooling circuit is longer, which improves the cooling effect.

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

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

[0069] In the above-mentioned implementation process, the first oil outlet groove 2012 is arranged on the first end plate 201, which can be used to receive the lubricating oil flowing out of the magnetic steel hole 302 and discharge it to the outside of the first end plate 201, so as to realize oil circulation and cooling effect at the same time, 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 is closer to the center of the first end plate 201 than the second end, and the outer diameter of the first end is greater 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-slinging hole 2014, which corresponds to the second end and is used to throw the 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 groove 2012 to different outer diameters, after the oil enters the first oil outlet groove 2012, the resistance to oil flow can be reduced due to the action of centrifugal force, thereby improving the cooling effect and improving the performance of the motor rotor structure.

[0072] like Figure 2 and Figure 6 As shown, the second oil inlet portion includes a second oil inlet groove 2021, and the second oil inlet groove 2021 is configured with at least two, and the two second oil inlet grooves 2021 are symmetrically distributed on the second end plate 202, each of the second oil inlet grooves 2021 is connected to one of the magnetic steel holes 302, and the second oil inlet grooves 2021 are configured to allow the lubricating oil in the hollow structure to flow through the magnetic steel hole 302.

[0073] Exemplarily, the two second oil inlet grooves 2021 are symmetrically distributed on the second end plate 202 so that the angle between the two second oil inlet grooves 2021 is 180°, and the second oil inlet grooves 2021 are located on the side of the second end plate 202 close to the rotor core 301, and each of the second oil inlet grooves 2021 corresponds to a first reversing portion (i.e., the first reversing groove 2013) and a second oil outlet portion (i.e., the second oil outlet groove 2022), and the second oil inlet groove 2021 and the second oil outlet groove 2022 are adjacent to each other to form the second oil channel, so that 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 magnetic steel hole 302, after passing through the first reversing portion of the first end plate 201, it passes through the adjacent magnetic steel hole 302 to the second oil outlet portion, until the lubricating oil is thrown out of the second end plate 202, completing the cooling of at least two second oil channels.

[0074] In the above-mentioned 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 enter the corresponding magnetic steel holes 302 connected thereto, thereby forming at least two second oil channels, which can cool different positions of the motor rotor structure, and the cooling circuit is longer, thereby improving the cooling effect.

[0075] like Figure 2 and Figure 6 As shown, the second oil inlet groove 2021 includes two second arcuate edges, and the two second arcuate edges are connected so that the size of the end portion is smaller than the size of the middle portion. Exemplarily, the second oil inlet groove 2021 is configured as a fan blade shape, so that the size of the end portion of the second oil inlet groove 2021 is smaller than the size of the middle portion or the position close to the middle portion, and each of the second oil inlet grooves 2021 is connected to the first magnetic steel groove 3021 and the second magnetic steel groove 3022 of the magnetic steel hole 302.

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

[0077] Please refer to Figure 2 and Figure 6 The second reversing portion includes a second reversing groove 2023, and the second reversing groove 2023 is configured with at least two, and the two second reversing grooves 2023 are symmetrically distributed on the second end plate 202, and each of the second reversing grooves 2023 is connected to the two adjacent magnetic steel holes 302, and the second reversing groove 2023 is configured to reverse the lubricating oil and flow in the two adjacent magnetic steel holes 302.

[0078] Exemplarily, the two second reversing grooves 2023 are symmetrically distributed on the second end plate 202, and the angle between the two second reversing grooves 2023 is 180°. The second reversing groove 2023 is located on the side of the second end plate 202 close to the rotor core 301, and each first oil inlet portion corresponds to a second reversing groove 2023, wherein the shape of the second reversing groove 2023 includes but is not limited to a trapezoidal groove, and of course it can also be other shapes, as long as it is able to connect the two adjacent magnetic steel holes 302.

[0079] In the above-mentioned implementation process, the second reversing groove 2023 is used to connect the two adjacent magnetic steel holes 302, so that the lubricating oil enters one of the magnetic steel holes 302 from the second oil inlet groove 2021, and then enters the other magnetic steel hole 302 after reversing the second reversing groove 2023, until it flows into the second oil outlet to complete the cooling. The cooling circuit is longer, which improves the cooling effect.

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

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

[0082] In the above-mentioned implementation process, the second oil outlet groove 2022 is arranged on the second end plate 202, which can be used to receive the lubricating oil flowing out of the magnetic steel hole 302 and discharge it to the outside of the second end plate 202, so as to realize oil circulation and cooling effect at the same time, 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, 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 greater 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-slinging hole 2024, which corresponds to the fourth end and is used to throw the lubricating oil out of the second end plate 202.

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

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

[0086] In the above-mentioned implementation process, a magnetic isolation bridge 303 is set on the core group 30. Compared with the solution of canceling the magnetic isolation bridge 303, it can reduce leakage magnetic field and improve the utilization rate of the magnetic field. At the same time, the core group 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 rotating shaft 10 is provided with a mounting position, which is configured to assemble the bearing 40, and the mounting position is configured to be inclined along the end of the rotating shaft 10 to its center.

[0088] Exemplarily, the mounting position is tilted 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 close to the center of the rotating shaft 10, so that the mounting position is tilted, and the inclination angle of the mounting position is 0.3°~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 pressing between the first end plate 201, the second end plate 202 and the rotor core 301.

[0089] It is understandable that a plurality of second oil outlet holes 102 are provided at positions of the rotating shaft 10 corresponding to the bearings 40 , and the second oil outlet holes 102 are used to flow the oil in the rotating shaft 10 to the bearings 40 .

[0090] In the above-mentioned 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 rotating shaft 10 enters between the bearing 40 and the mounting position, a dynamic oil film can be formed, which can not only ensure the stability of the assembly between the bearing 40 and the rotating shaft 10 and realize the support of the motor rotor structure at high speed, but also avoid rust at the connection between the rotating shaft 10 and the bearing 40.

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

[0092] Exemplarily, 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~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~7mm, for example, the size is set to 5mm, 6mm, etc.

[0093] In the above implementation process, by arranging 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 a high mechanical strength at high speed, thereby ensuring the performance of the motor rotor structure.

[0094] In a second aspect, the present application also provides an electric drive system, comprising the motor rotor structure as 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 described in detail here.

[0096] In all the embodiments of the present application, "big" and "small" are relative, "more" and "less" are relative, and "up" and "down" are relative. The expressions of such relative terms are not elaborated in the embodiments of the present application.

[0097] It should be understood that the "in this embodiment", "in the embodiment of the present application" or "as an optional implementation" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in this embodiment", "in the embodiment of the present application" or "as an optional implementation" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required for the present application.

[0098] In the various embodiments of the present application, it should be understood that the size of the serial numbers of the above-mentioned processes does not necessarily mean 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 the present application.

[0099] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A motor rotor structure, characterized in that: include: A rotating shaft configured as a hollow structure, wherein the hollow structure is used to contain lubricating oil; An iron core group, which is sleeved on the rotating shaft, and the iron core group has a plurality of magnetic steel holes distributed along its circumference; An end plate assembly, comprising a first end plate and a second end plate, wherein the first end plate and the second end plate are sleeved on the rotating shaft, the first end plate is located on one side of the core group, and the second end plate is located on the other side of the core group, the first end plate is provided with a first oil inlet, a first oil outlet and a first reversing portion, the second end plate is provided with a second oil inlet, a second oil outlet and a second reversing portion, the first oil inlet, the first oil outlet, the first reversing portion, the second oil inlet, the first oil outlet and the second reversing portion are all in conduction with the magnetic steel hole, and the first oil inlet and the second oil inlet are both in conduction with the hollow structure; The first oil inlet, the second reversing part and the first oil outlet are connected to the magnetic steel hole to form a first oil channel, and the second oil inlet, the first reversing part and the second oil outlet are connected to the magnetic steel hole to form a second oil channel.

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

3. The motor rotor structure according to claim 2, characterized in that: The first oil inlet groove includes two first arcuate edges, and the two first arcuate edges are connected so that the size of the end portion is smaller than the size of the middle portion.

4. The motor rotor structure according to claim 1, characterized in that: The first reversing portion includes a first reversing groove, and there are at least two first reversing grooves, and the two first reversing grooves are symmetrically distributed on the first end plate. Each of the first reversing grooves is connected to two adjacent magnetic steel holes, and the first reversing groove is configured to reverse the lubricating oil and flow in two adjacent magnetic steel holes.

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

6. The motor rotor structure according to claim 5, characterized in that: 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 an outer diameter of the first end is greater than an outer diameter of the second end.

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

8. The motor rotor structure according to claim 7, characterized in that: The second oil inlet groove includes two second arcuate edges, and the two second arcuate edges are connected so that the size of the end portion is smaller than the size of the middle portion.

9. The motor rotor structure according to claim 1, characterized in that: The second reversing portion includes a second reversing groove, and there are at least two second reversing grooves. The two second reversing grooves are symmetrically distributed on the second end plate, and each of the second reversing grooves is connected to the two adjacent magnetic steel holes. The second reversing groove is configured to reverse the lubricating oil and flow in the two adjacent magnetic steel holes.

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

11. The motor rotor structure according to claim 10, characterized in that: The second oil outlet groove includes a third end and a fourth end. The third end is closer to the center of the second end plate than the fourth end. The outer diameter of the third end is greater than the outer diameter of the fourth end.

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

13. The motor rotor structure according to any one of claims 1 to 12, characterized in that: The motor rotor structure also includes a bearing. The rotating shaft is provided with a mounting position, which is configured to assemble the bearing. The mounting position is configured to be inclined along the direction from the end of the rotating shaft to its center.

14. The motor rotor structure according to any one of claims 1, characterized in that: The motor rotor structure further includes a sheath, which is 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.

15. An electric drive system, characterized in that: It comprises the motor rotor structure as claimed in any one of claims 1 to 14.

Images