End plate of motor rotor, motor rotor assembly and motor

Abstract

The utility model relates to the field of motors, in particular to an end plate of a motor rotor, a motor rotor assembly and a motor, the end plate is provided with an inner surface facing a rotor iron core, and the center of the inner surface of the end plate is provided with a central through hole for a rotor rotating shaft to pass through; a liquid inlet flow channel is further formed in the inner surface of the end plate and comprises a first flow guide section and a second flow guide section; the first flow guide section extends in the radial direction of the end plate, the first end of the first flow guide section extends to the center through hole and is communicated with a cooling liquid outlet in the rotor rotating shaft, and the second end of the first flow guide section extends to the second flow guide section; the second flow guide section extends along the circumferential direction of a set circle and is communicated with a cooling liquid inlet in the rotor core, the set circle takes the circle center of the end plate as the circle center, and the sum of the radius size of the central through hole, the length size of the first flow guide section and half of the width size of the second flow guide section is taken as the radius; a liquid inlet runner avoiding mark is arranged on the outer surface of the end plate; the structure can meet the design requirements of flow and flow velocity of cooling liquid in the motor rotor, the motor rotor is cooled sufficiently, the cooling efficiency of the motor rotor is effectively improved, and the failure rate of the motor rotor during dynamic balance correction is reduced.

Description

Technical Field

[0001] The present application relates to the field of motors, and more specifically, to an end plate of a motor rotor, a motor rotor assembly, and a motor. Background Art

[0002] With the rapid development of the new energy motor industry, the market demand for high-reliability, high-torque, high-power, and high-speed motors continues to increase. Among them, motor materials have certain restrictions on temperature, so a reasonable cooling system needs to be designed for high-performance motors.

[0003] At present, there are several ways to cool the motor rotor, including cooling the inner surface of the rotor core through the rotor shaft, and introducing the coolant into the rotor core through the rotor shaft and the rotor end plate (short for the end cover plate). In each scheme, the coolant flow channel set on the motor rotor end plate is slightly simple in shape and structure, resulting in insufficient motor cooling and low cooling efficiency. At the same time, when performing dynamic balancing on the assembled motor rotor, since the inner coolant flow channel cannot be observed, there is a risk of accidentally piercing the inner flow channel when drilling, which in turn causes the coolant flow channel to fail, or even the motor rotor to be scrapped.

[0004] Therefore, the overall structure of the motor rotor end plate needs to be further optimized. Utility Model Content

[0005] The purpose of the present application is to provide a novel motor rotor end plate, a motor rotor assembly and a motor, aiming to solve the technical problems in the prior art that the overall structural setting of the motor rotor end plate is unreasonable, resulting in insufficient motor cooling, low cooling efficiency, and possible failure during dynamic balancing correction of the motor rotor.

[0006] To achieve this purpose, on the one hand, the technical solution adopted in the present application is: to provide an end plate of a motor rotor, which is in the shape of a circular plate and is used to cover the end of the rotor core, and has an inner surface facing the rotor core when covered on the end of the rotor core, and the inner surface of the end plate is provided with a central through hole for the rotor shaft to pass through at the center of the circle; a liquid inlet channel is also formed on the inner surface of the end plate, and the liquid inlet channel includes a first guide section and a second guide section, and the depth dimension of the first guide section and the depth dimension of the second guide section are both smaller than the thickness dimension of the end plate; the first guide section extends along the radial direction of the end plate and has a first end and a second end opposite to each other, The first end of the first guide section extends to the central through hole to be connected with the coolant outlet on the side wall of the rotor shaft, and the second end of the first guide section extends to the second guide section and is connected with the second guide section; the second guide section extends along the circumferential direction of a set circle and is connected with the coolant inlet on the end face of the rotor core, wherein the set circle takes the center of the end plate as the center and takes the sum of the radius of the central through hole, the length of the first guide section and half of the width of the second guide section as the radius; a liquid inlet channel avoidance mark is provided on the outer surface of the end plate opposite to the inner surface.

[0007] Further, the width dimension of the first guide segment is greater than the width dimension of the second guide segment; and / or, the length dimension of the first guide segment is greater than the length dimension of the second guide segment; and / or, the second end of the first guide segment is connected to the middle part of the second guide segment; the minimum distance from the middle part of the second guide segment to the edge of the central through hole and the minimum distance to the edge of the end plate are basically consistent.

[0008] Furthermore, a liquid outlet channel spaced apart from the liquid inlet channel is also provided on the end plate, and the liquid outlet channel includes a third guide section, a fourth guide section and an inner guide section which are connected in sequence; the third guide section and the fourth guide section are both formed on the inner surface of the end plate, and the depth of the third guide section and the depth of the fourth guide section are both less than the thickness of the end plate; the third guide section extends along the circumferential direction of the set circle and is connected to the coolant outlet on the rotor core; the fourth guide section extends along the radial direction of the end plate and has a third end close to the center through hole and a fourth end opposite to the third end, and the third end of the fourth guide section is connected to the third guide section; the inner guide section has a liquid outlet connected to the outside, and the inner guide section extends obliquely from the fourth end of the third guide section to the inside of the end plate to the liquid outlet.

[0009] Furthermore, a liquid outlet channel avoidance mark is provided on the outer surface of the end plate.

[0010] Furthermore, the shape of the inlet flow channel avoidance mark is consistent with the projection shape of the second guide segment on the outer surface of the end plate; and / or, the outlet flow channel avoidance mark includes a first identification segment, a second identification segment and a third identification segment; the shape of the first identification segment is consistent with the projection shape of the third guide segment on the outer surface of the end plate, the shape of the second identification segment is consistent with the projection shape of the fourth guide segment on the outer surface of the end plate, and the shape of the third identification segment is consistent with the projection shape of the inner guide segment on the outer surface of the end plate.

[0011] Furthermore, the liquid inlet channel avoidance mark is a circle with the center of the end plate as the center and a radius not less than a set radius size; the set radius size is the larger value of the sum of the radius size of the set circle and the width size of the second guide section and the sum of the radius size of the set circle and the width size of the third guide section; the extension direction of the projection of the inner guide section on the inner surface is consistent with the extension direction of the fourth guide section, and the width sizes of the fourth guide section and the inner guide section are consistent; the shape of the liquid outlet channel avoidance mark is basically consistent with the shape of the portion of the projection of the fourth guide section and the inner guide section on the outer surface of the end plate located outside the liquid inlet channel avoidance mark.

[0012] Furthermore, the liquid outlet is located in the middle of the side wall of the end plate; and / or the width dimensions of the third guide section, the fourth guide section and the inner guide section are basically the same; and / or the length dimension of the third guide section is smaller than the length dimension of the fourth guide section.

[0013] Furthermore, the end plate is provided with a plurality of liquid inlet channels and a plurality of liquid outlet channels of the same shape and structure, and the number of the liquid inlet channels and the liquid outlet channels is the same; the plurality of liquid inlet channels and the plurality of liquid outlet channels are alternately arranged on the periphery of the central through hole.

[0014] Furthermore, the number of the liquid inlet flow channels and the number of the liquid outlet flow channels are both four; the angle between the extension direction of the first guide section of each liquid inlet flow channel and the extension direction of the fourth guide section of the adjacent liquid outlet flow channel is 45°.

[0015] Furthermore, the second guide section of each liquid inlet flow channel and the third guide section of each liquid outlet flow channel are consistent in shape and structure.

[0016] Furthermore, there are two end plates, namely a first end plate and a second end plate, and the first end plate and the second end plate are respectively covered on both ends of the rotor core; the four liquid inlet channels of the first end plate are respectively connected to the four liquid outlet channels of the second end plate in a one-to-one correspondence, and the four liquid inlet channels of the second end plate are respectively connected to the four liquid outlet channels of the first end plate in a one-to-one correspondence.

[0017] The beneficial effect of the end plate of the motor rotor provided by the present application is that: compared with the prior art, the end plate of the motor rotor proposed in the present application is in the shape of a circular plate and has an inner surface facing the rotor core, and the inner surface of the end plate is provided with a central through hole for the rotor shaft to pass through at the center of the circle; a liquid inlet flow channel is also formed on the inner surface of the end plate, and the liquid inlet flow channel includes a first guide section and a second guide section, the first guide section extends along the radial direction of the end plate and has a first end and a second end opposite to each other, the first end of the first guide section extends to the central through hole to be connected with the coolant outlet on the rotor shaft, and the second end of the first guide section extends to the second guide section and is connected with the second guide section; in this way, the coolant thrown out from the rotor shaft can flow to the second guide section through the first guide section; the second guide section extends along the circumferential direction of the set circle and is connected with the coolant inlet on the end face of the rotor core, and the set The fixed circle takes the center of the end plate as the center, and takes the sum of the radius of the central through hole, the length of the first guide section and half of the width of the second guide section as the radius; the second guide section set in this way is easy to process, and through CFD simulation optimization analysis, it is found that the oil channel structure can meet the design requirements of the coolant flow rate and flow rate in the motor rotor. After the coolant is thrown out from the rotor shaft, it passes through the first guide section and the second guide section and enters the coolant inlet on the end face of the rotor core to cool the inside of the rotor core, so that the motor rotor is fully cooled and the cooling efficiency of the motor rotor is effectively improved; at the same time, by setting a liquid inlet channel avoidance mark on the outer surface of the end plate, a visual machining area is provided when the motor rotor is balanced and corrected, which greatly facilitates the balance correction, avoids the drill bit from damaging the oil channel area on the inner side of the end plate, and reduces the probability of end plate failure.

[0018] The second aspect of the present application provides a motor rotor assembly, including a rotor shaft, a rotor core and an end plate of any of the above motor rotors, the rotor core is sleeved on the rotor shaft, the end plate is sleeved on the rotor shaft and covers the end of the rotor core; a coolant outlet is provided on the side wall of the rotor shaft, and a coolant inlet is provided on the end surface of the rotor core; the first end of the first guide section of the end plate is connected to the coolant outlet on the rotor shaft, and the second guide section of the end plate is connected to the coolant inlet on the rotor core. The beneficial effect of the motor rotor assembly provided by the present application is that: compared with the prior art, the motor rotor assembly proposed in the present application optimizes the coolant flow channel structure between the rotor shaft, the rotor core and the motor rotor end plate, so that the rotor core and the internal magnetic steel can be efficiently cooled at a close distance, and the cooling effect is better; at the same time, by setting a liquid inlet flow channel avoidance mark on the outer surface of the end plate, the assembly of the motor rotor assembly is facilitated, and it also helps to reduce the failure rate of the motor rotor assembly during dynamic balancing correction.

[0019] The third aspect of the present application provides a motor, including the above-mentioned motor rotor assembly. The beneficial effect of the motor provided by the present application is that: compared with the prior art, the motor proposed by the present application, the rotor core and the internal magnetic steel can achieve close-range efficient cooling, the cooling effect of the motor is good, and the reliability and performance limit of the motor can be significantly improved; by setting the liquid inlet flow channel avoidance mark on the outer surface of the motor rotor end plate, the motor assembly is facilitated, and the motor failure rate is effectively reduced.

[0020] Other advantages of the present application and the technical effects of the preferred embodiments will be further described in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 is a plan view of a motor rotor assembly provided in an embodiment of the present application;

[0023] Figure 2 is a three-dimensional schematic diagram of a rotor shaft provided in an embodiment of the present application;

[0024] Figure 3 (1) Figure 3 (2) Figure 3 (3) Figure 3 (4) are schematic diagrams of the flow routes of the cooling liquid inside the rotor provided in the embodiments of the present application Figure 1, Schematic diagram of the flow path of the coolant inside the rotor Figure 2 , a plan view of the inner surface of the first end plate, a plan view of the inner surface of the second end plate;

[0025] Figure 4 It is a three-dimensional schematic diagram of the end plate and the rotor shaft provided in the embodiment of the present application;

[0026] Figure 5 is a schematic plan view of the outer surface of a conventional end plate;

[0027] Figure 6 is a schematic plan view of the outer surface of an end plate provided by an embodiment of the present application;

[0028] Figure 7 It is a three-dimensional schematic diagram of the outer surface of an end plate provided in another embodiment of the present application.

[0029] Among them, the reference numerals in the figure are:

[0030] 1-rotor core; 2-first end plate; 3-second end plate; 4-rotor shaft; 5-locking nut; 21-liquid inlet channel of the first end plate; 22-liquid outlet channel of the first end plate; 31-liquid inlet channel of the second end plate; 32-liquid outlet channel of the second end plate; 41-coolant inlet of the rotor shaft; 42-coolant outlet of the rotor shaft; 6-liquid inlet channel avoidance mark; 7-liquid outlet channel avoidance mark; 100-liquid outlet; A-punchable area. DETAILED DESCRIPTION

[0031] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0033] It should be understood that the directions or positional relationships indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0034] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] In addition, in the description of the present application, “plurality” means two or more than two, unless otherwise clearly and specifically defined.

[0036] like Figures 1 to 7 As shown, an end plate of a motor rotor provided in an embodiment of the present application can be specifically an end plate of a motor rotor of an embedded permanent magnet synchronous motor used in a new energy vehicle, which is in the shape of a circular plate and is used to cover the end of the rotor core 1, specifically can be covered on at least one end of the rotor core 1; the end plate is in the shape of a circular plate, which can be understood as both end faces of the end plate are circular and have a certain thickness; specifically, the end plate has an inner surface facing the rotor core 1 when it is covered on the end of the rotor core 1, and the inner surface of the end plate is provided with a central through hole at the center of the circle for the rotor shaft 4 to pass through; optionally, please refer to Figure 2 , Figure 3 (3) and Figure 3 (4) A keyway may be formed at the edge of the central through hole to connect the end plate and the rotor shaft 4 by a key, or other forms of connection may be used. A liquid inlet channel is also formed on the inner surface of the end plate, and the liquid inlet channel includes a first guide section and a second guide section. The depth dimension of the first guide section and the depth dimension of the second guide section are both smaller than the thickness dimension of the end plate. It can be understood that the first guide section and the second guide section do not penetrate the end plate along the thickness direction of the end plate. Preferably, the depth dimension of the first guide section and the depth dimension of the second guide section are the same; the first guide section extends along the radial direction of the end plate, that is, the first guide section is in a straight line shape, and one end points to the center of the inner surface of the end plate. Specifically, the first guide section has a first end and a second end opposite to each other, and the first end of the first guide section extends to the central through hole to communicate with the coolant outlet 42 on the side wall of the rotor shaft 4, such as Figure 3 (3) and Figure 3(4) is shown, wherein the coolant can be a water-cooled coolant or an oil-cooled coolant, which can be selected according to actual conditions. The coolant described below takes cooling oil as an example; the second end of the first guide section extends to the second guide section and is connected to the second guide section; further, the second guide section extends along the circumferential direction of the set circle and is connected to the coolant inlet on the end face of the rotor core 1. It should be noted that the set circle can be understood as an extended reference circle in the length direction of the second guide section. The guide section has a certain width. After the width dimension of the second guide section is determined, the size and position of the set circle can be determined. Specifically, the set circle takes the center of the end plate as the center of the circle and the sum of the radius dimension of the central through hole, the length dimension of the first guide section and half of the width dimension of the second guide section as the radius; the end plate has an outer surface opposite to the inner surface, and a liquid inlet channel avoidance mark 6 is provided on its outer surface. The liquid inlet channel avoidance mark 6 can have a variety of styles and shapes, which can provide a reference for avoiding the liquid inlet channel for the machine weight reduction hole during rotor balancing correction.

[0037] The present application proposes an end plate of a motor rotor, which reasonably arranges the rotor shaft 4, the first guide section and the second guide section, so that the coolant thrown out from the rotor shaft 4 can flow to the second guide section through the first guide section, and then enter the coolant inlet on the end face of the rotor core 1 from the second guide section to cool the inside of the rotor core 1, so that the motor rotor is fully cooled and the cooling efficiency of the motor rotor is effectively improved; the shape of the second guide section is convenient for processing, and the coolant flow channel structure obtained through CFD simulation optimization analysis can meet the design requirements of the coolant flow rate and flow velocity in the motor rotor; at the same time, by arranging the liquid inlet flow channel avoidance mark 6 on the outer surface of the end plate, a visual machining area is provided when the motor rotor is balanced and corrected, which provides great convenience for the balance correction, avoids the drill bit from damaging the oil channel area on the inner side of the end plate, and reduces the probability of end plate failure.

[0038] For further information, please also refer to Figure 3 and Figure 4 As a specific embodiment of the end plate of the motor rotor provided in the present application, the width dimension of the first guide section is greater than the width dimension of the second guide section; further optionally, the length dimension of the first guide section is greater than the length dimension of the second guide section; further optionally, the second end of the first guide section is connected to the middle of the second guide section, and the two are in a roughly T-shaped structure; the minimum distance from the middle of the second guide section to the edge of the central through hole is basically the same as the minimum distance to the edge of the end plate. The above coolant flow channel structures are obtained through CFD simulation optimization analysis, which can meet the design requirements of the coolant flow rate and flow velocity in the motor rotor, and the cooling effect of the motor rotor is good.

[0039] In one embodiment of the present application, please continue to refer to Figure 3 and Figure 4, the end plate is also provided with a liquid outlet channel spaced from the liquid inlet channel. It can be understood that the liquid inlet channel and the liquid outlet channel on the same end plate are spaced from each other and are not connected; the liquid outlet channel includes a third guide section, a fourth guide section and an inner guide section which are connected in sequence; the third guide section and the fourth guide section are both formed on the inner surface of the end plate, the inner guide section is formed inside the end plate, and the depth of the third guide section and the depth of the fourth guide section are both less than the thickness of the end plate. Similarly, the third guide section and the fourth guide section do not penetrate the end plate in the thickness direction of the end plate; the third guide section extends along the circumferential direction of the above-mentioned set circle and is connected to the coolant outlet on the rotor core 1. In this way, the second guide section and the third guide section are both connected along the The circumferential arrangement of the same circle facilitates the arrangement and design of the second guide section and the third guide section within the limited space on the end plate, and the structure is reasonable; the fourth guide section extends radially along the end plate and has a third end close to the central through hole and a fourth end opposite to the third end, and the third end of the fourth guide section is connected to the third guide section; the inner guide section has a liquid outlet 100 connected to the outside, and the inner guide section extends obliquely from the fourth end of the third guide section to the inside of the end plate to the liquid outlet 100; optionally, the liquid outlet 100 is arranged directly opposite to the stator end winding, so that the high-speed oil beam ejected from the liquid outlet 100 of the end plate can efficiently cool the stator end winding, and of course, the liquid outlet 100 can also be arranged at other positions of the end plate as needed.

[0040] As a further optimization, a liquid outlet channel avoidance mark 7 is also provided on the outer surface of the end plate. The liquid outlet channel avoidance mark 7 can have various styles and shapes, which can provide a reference for avoiding the liquid outlet channel for the machine to add weight reduction holes during rotor balancing correction.

[0041] from Figure 5 It can be seen that there are no corresponding flow channel avoidance marks on the outer surface of the conventional end plate, which is very likely to cause end plate failure during balance correction; please refer to Figure 6 In one embodiment, the shape of the liquid inlet channel avoidance mark 6 is consistent with the projection shape of the second guide section on the outer surface of the end plate; this structure is easy to process and identify, and effectively prevents damage to the liquid inlet channel of the end plate during rotor balancing correction.

[0042] Optionally, the liquid outlet channel avoidance mark 7 includes a first marking segment, a second marking segment and a third marking segment; the shape of the first marking segment is consistent with the projection shape of the third guide segment on the outer surface of the end plate, the shape of the second marking segment is consistent with the projection shape of the fourth guide segment on the outer surface of the end plate, and the shape of the third marking segment is consistent with the projection shape of the inner guide segment on the outer surface of the end plate, that is, the three marking segments of the liquid outlet channel avoidance mark 7 can display the positions of the three guide segments of the liquid flow channel one by one, so as to protect the liquid outlet channel of the end plate during the rotor balancing correction.

[0043] In one embodiment of the present application, see Figure 7 The liquid inlet channel avoidance mark 6 can be a circle with the center of the end plate as the center and a radius not less than the set radius size; the set radius size is the larger value of the sum of the radius size of the set circle and the width size of the second guide section, and the sum of the radius size of the set circle and the width size of the third guide section; the specific radius size of the liquid inlet channel avoidance mark 6 can be selected according to actual conditions, and is preferably equal to the above-mentioned set radius size; the liquid inlet channel avoidance mark 6 is easy to process and easy to identify, and can effectively prevent damage to the liquid inlet channel of the end plate during rotor balancing correction.

[0044] Furthermore, the extension direction of the projection of the inner guide section on the inner surface is consistent with the extension direction of the fourth guide section, and the width dimensions of the fourth guide section and the inner guide section are consistent; the shape of the outlet flow channel avoidance mark 7 is basically consistent with the shape of the part of the projection of the fourth guide section and the inner guide section on the outer surface of the end plate located outside the liquid inlet flow channel avoidance mark 6; similarly, the outlet flow channel avoidance mark 7 is easy to process and identify, and can effectively prevent damage to the outlet flow channel of the end plate during rotor balancing correction.

[0045] Optionally, the liquid outlet 100 is located in the middle of the side wall of the end plate; such an arrangement facilitates efficient cooling of the stator end winding by means of the high-speed oil beam thrown out by the liquid outlet 100 of the end plate, and the structural setting is reasonable.

[0046] Optionally, the width dimensions of the third guide section, the fourth guide section and the inner guide section are basically the same; optionally, the length dimension of the third guide section is smaller than the length dimension of the fourth guide section; the above structures are easy to process and ensure the design requirements of the coolant flow rate and flow velocity in the motor rotor, thereby effectively ensuring a better cooling effect of the motor rotor.

[0047] Furthermore, the end plate is provided with a plurality of liquid inlet channels and a plurality of liquid outlet channels of the same shape and structure, and the number of the liquid inlet channels and the liquid outlet channels is the same; the plurality of liquid inlet channels and the plurality of liquid outlet channels are arranged alternately on the periphery of the central through hole. Furthermore, the number of the liquid inlet channels and the liquid outlet channels are both four; the angle between the extension direction of the first guide section of each liquid inlet channel and the extension direction of the fourth guide section of the adjacent liquid outlet channel is 45°, and the specific angle position can be found in Figure 3 (3) It can be understood that the present application designs four liquid inlet channels and four liquid outlet channels in a staggered circumferentially uniform manner on the end plate. As a further optimization, combined with Figure 3 and Figure 4The second guide section of each liquid inlet flow channel and the third guide section of each liquid outlet flow channel have the same shape and structure; the above structure is easy to process and ensures the design requirements of the coolant flow rate and flow velocity in the motor rotor, thereby effectively ensuring a better cooling effect of the motor rotor and high cooling efficiency of the motor rotor.

[0048] In one embodiment of the present application, please refer to Figure 1 and Figure 3 , there are two end plates, namely the first end plate 2 and the second end plate 3, which are respectively covered on the left and right ends of the rotor core 1; the present application determines the number and size of the liquid inlet and outlet channels of the two end plates of the rotor by means of motor cooling flow field simulation, so as to achieve the purpose of uniform cooling of the front and rear ends of the rotor; in this embodiment, the four liquid inlet channels 21 of the first end plate 2 are connected to the four liquid outlet channels 32 of the second end plate 3 in a one-to-one correspondence, and the four liquid inlet channels 21 of the second end plate 3 are connected to the four liquid outlet channels 32 of the second end plate 3 in a one-to-one correspondence. The flow channel 31 is connected to the four liquid outlet flow channels 22 of the first end plate 2 in a one-to-one correspondence; preferably, the liquid outlet position of the liquid inlet flow channel 21 of the first end plate 2 and the liquid inlet position of the liquid outlet flow channel 32 of the connected second end plate 3 are on a straight line, and the straight line is preferably parallel to the axis of the rotor shaft; at the same time, the liquid outlet position of the liquid inlet flow channel 31 of the second end plate 3 and the liquid inlet position of the liquid outlet flow channel 22 of the connected first end plate 2 are also on a straight line, and the straight line is preferably also parallel to the axis of the rotor shaft.

[0049] like Figure 3 As shown in (1) and 3(2), the rotor shaft 4 may be a hollow structure, with a coolant inlet 41 at the right end, and radial coolant flow channels and coolant outlets 42 evenly distributed at the left and right ends of the rotor shaft 4. The coolant flows into the first end plate 2 (left) and the second end plate 3 (right) of the rotor through the rotor shaft 4, and then flows into the interior of the rotor core 1 assembly to cool the rotor; specifically, as Figure 3 As shown in (1), the coolant flows in from the inlet at the right end of the rotor shaft 4, flows axially to the left end, and then flows into the first end plate 2 of the rotor through the radial oil passage, flows into the interior of the rotor core 1 assembly through the liquid inlet channel 21 of the first end plate 2, and then flows axially to the second end plate 3 of the rotor, and finally flows out from the liquid outlet 100 on the side wall of the second end plate 3 through the liquid outlet channel 32 of the second end plate 3; Figure 3 As shown in (2), the coolant flows in from the inlet at the right end of the rotor shaft 4, flows axially to the radial oil passage at the right end, flows into the second end plate 3 of the rotor, flows into the interior of the rotor core 1 assembly from the liquid inlet channel 31 of the second end plate 3, flows axially to the first end plate 2 of the rotor, and finally flows out from the liquid outlet 100 on the side wall of the first end plate 2 through the liquid outlet channel 22 of the first end plate 2.

[0050] It should be pointed out that the coolant has a high flow rate under the action of high-speed centrifugal force, and can be directly sprayed on the end of the motor stator winding to cool the winding. In the above embodiment of the present application, accordingly, eight channels of coolant are formed inside the rotor core 1 assembly, which can cool the rotor core 1 and the magnetic steel at a close distance, and the cooling effect is better; and, oil is introduced from the left and right ends of the rotor core 1 assembly respectively, so that the left and right ends of the rotor core 1 can be evenly cooled, so that the temperature of the left and right ends of the rotor is uniform and fully cooled, which is conducive to higher performance of the motor output.

[0051] On the other hand, see Figure 1 The present application provides a motor rotor assembly, comprising a rotor shaft 4, a rotor core 1 and an end plate of any of the above motor rotors, wherein the rotor core 1 is sleeved on the rotor shaft 4, and the end plate is sleeved on the rotor shaft 4 and covers the end of the rotor core 1; a coolant outlet 42 is provided on the side wall of the rotor shaft 4, and a coolant inlet is provided on the end surface of the rotor core 1; the first end of the first guide section of the end plate is connected to the coolant outlet 42 on the rotor shaft 4, and the second guide section of the end plate is connected to the coolant inlet on the rotor core 1. Compared with the prior art, the motor rotor assembly proposed in the present application optimizes the coolant flow channel structure between the rotor shaft 4, the rotor core 1 and the motor rotor end plate, so that the rotor core 1 and the internal magnetic steel can be efficiently cooled at a close distance, and the cooling effect is better; at the same time, by setting a liquid inlet flow channel avoidance mark 6 on the outer surface of the end plate, the assembly of the motor rotor assembly is facilitated, and it also helps to reduce the failure rate of the motor rotor assembly during dynamic balancing correction.

[0052] In one embodiment, if Figure 1 As shown, the rotor assembly structure of the embedded permanent magnet synchronous motor includes a rotor core 1, a first end plate 2, a second end plate 3, a rotor shaft 4 and a locking nut 5. The rotor core 1, the first end plate 2 and the second end plate 3 are sequentially inserted into the rotor shaft 4 in the assembly order, and finally the above components are pressed and fixed with the locking nut 5. When installing the motor rotor assembly, the liquid inlet channel on the end plate needs to be aligned with the coolant outlet 42 of the rotor shaft 4. The coolant enters through the coolant axial oil channel inlet of the rotor shaft 4 and flows through the left and right radial oil channels of the rotor shaft 4. Under the action of oil pressure and rotating centrifugal force, the engine oil will flow into the liquid inlet channels on the first end plate 2 and the second end plate 3 of the rotor respectively. The liquid inlet channel on one end plate guides the engine oil to flow into the inside of the rotor core 1 to directly cool the inside of the rotor, and finally it is thrown out from the liquid outlet channel of the other end plate, and the high-speed oil beam cools the stator end winding.

[0053] in addition, Figure 5 This is the rotor baffle under normal circumstances. Figure 6 , Figure 7This application discloses a rotor baffle with a stamped deweighting range. In order to prevent the end plate machine-made weight-reducing holes from accidentally penetrating the internal oil passages, this application proposes a convenient method for marking the oil passages on the outside of the rotor end plate. This method uses machining, laser printing or stamping techniques on the outside of the first rotor end plate 2 and the second rotor end plate 3 to mark the contours of the inner surface flow passages, thereby avoiding the internal oil passages of the end plates and visualizing the area where the weight-reducing holes can be machined (i.e., punching area A). In this way, during the manual and semi-automatic balancing hole punching process, the machinable position can be accurately known; at the same time, based on the stamped marks (liquid inlet channel avoidance mark 6 and liquid outlet channel avoidance mark 7), a better reference angle is provided for adjusting the balancing punching operation, greatly improving the efficiency of material reduction balancing. This innovation is particularly effective in large-scale production.

[0054] On the other hand, please continue to read Figure 1 The present application provides a motor, including the motor rotor assembly described above. Compared with the prior art, the present application proposes a motor, in which the rotor core 1 and the internal magnetic steel can achieve close and efficient cooling, and the motor has a good cooling effect, which can ultimately significantly improve the motor reliability and performance limit; by setting a liquid inlet flow channel avoidance mark 6 and / or a liquid outlet flow channel avoidance mark 7 on the outer surface of the motor rotor end plate, the motor assembly is facilitated, and the motor failure rate is effectively reduced.

[0055] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation methods of the present application. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present application should be included in the protection scope of the claims of the present application.

Claims

1. An end plate of a motor rotor, in the shape of a circular plate and used to cover the end of a rotor core, characterized in that: The end plate has an inner surface that faces the rotor core when it is covered on the end of the rotor core, and a central through hole is opened at the center of the inner surface of the end plate for the rotor shaft to pass through; a liquid inlet channel is also formed on the inner surface of the end plate, and the liquid inlet channel includes a first guide section and a second guide section, and the depth dimension of the first guide section and the depth dimension of the second guide section are both smaller than the thickness dimension of the end plate; the first guide section extends along the radial direction of the end plate and has a first end and a second end opposite to each other, and the first end of the first guide section extends to the central through hole to contact with the end plate The coolant outlet on the side wall of the rotor shaft is connected, the second end of the first guide section extends to the second guide section and is connected to the second guide section; the second guide section extends along the circumferential direction of a set circle and is connected to the coolant inlet on the end face of the rotor core, wherein the set circle takes the center of the end plate as the center and takes the sum of the radius of the central through hole, the length of the first guide section and half of the width of the second guide section as the radius; an inlet flow channel avoidance mark is provided on the outer surface of the end plate opposite to the inner surface.

2. The end plate of the motor rotor according to claim 1, characterized in that: The width of the first guide section is greater than the width of the second guide section; and / or, the length of the first flow guiding section is greater than the length of the second flow guiding section; And / or, the second end of the first guide segment is connected to the middle of the second guide segment; the minimum distance from the middle of the second guide segment to the edge of the central through hole is substantially consistent with the minimum distance to the edge of the end plate.

3. The end plate of the motor rotor according to claim 1 or 2, characterized in that: The end plate is also provided with a liquid outlet channel spaced apart from the liquid inlet channel, and the liquid outlet channel includes a third guide section, a fourth guide section and an inner guide section which are connected in sequence; the third guide section and the fourth guide section are both formed on the inner surface of the end plate, and the depth of the third guide section and the depth of the fourth guide section are both less than the thickness of the end plate; the third guide section extends along the circumferential direction of the set circle and is connected to the coolant outlet on the rotor core; the fourth guide section extends along the radial direction of the end plate and has a third end close to the center through hole and a fourth end opposite to the third end, and the third end of the fourth guide section is connected to the third guide section; the inner guide section has a liquid outlet connected to the outside, and the inner guide section extends obliquely from the fourth end of the third guide section to the inside of the end plate to the liquid outlet.

4. The end plate of the motor rotor according to claim 3, characterized in that: A liquid outlet channel avoidance mark is also provided on the outer surface of the end plate.

5. The end plate of the motor rotor according to claim 4, characterized in that: The shape of the liquid inlet channel avoidance mark is consistent with the projection shape of the second guide section on the outer surface of the end plate; And / or, the liquid outlet channel avoidance mark includes a first marking segment, a second marking segment and a third marking segment; the shape of the first marking segment is consistent with the projection shape of the third guide segment on the outer surface of the end plate, the shape of the second marking segment is consistent with the projection shape of the fourth guide segment on the outer surface of the end plate, and the shape of the third marking segment is consistent with the projection shape of the inner guide segment on the outer surface of the end plate.

6. The end plate of the motor rotor according to claim 4, characterized in that: The liquid inlet flow channel avoidance mark is a circle with the center of the end plate as the center and a radius not less than a set radius size; the set radius size is the larger value of the sum of the radius size of the set circle and the width size of the second guide section and the sum of the radius size of the set circle and the width size of the third guide section; The extension direction of the projection of the inner guide section on the inner surface is consistent with the extension direction of the fourth guide section, and the width dimensions of the fourth guide section and the inner guide section are consistent; the shape of the outlet flow channel avoidance mark is basically consistent with the shape of the portion of the projection of the fourth guide section and the inner guide section on the outer surface of the end plate located outside the inlet flow channel avoidance mark.

7. The end plate of the motor rotor according to claim 3, characterized in that: The liquid outlet is located in the middle of the side wall of the end plate; And / or, the widths of the third guide section, the fourth guide section and the inner guide section are substantially the same; And / or, the length dimension of the third guide segment is smaller than the length dimension of the fourth guide segment.

8. The end plate of the motor rotor according to any one of claims 4 to 7, characterized in that: The end plate is provided with a plurality of liquid inlet channels and a plurality of liquid outlet channels of the same shape and structure, and the number of the liquid inlet channels and the liquid outlet channels is the same; the plurality of liquid inlet channels and the plurality of liquid outlet channels are alternately arranged on the periphery of the central through hole.

9. The end plate of the motor rotor according to claim 8, characterized in that: The number of the liquid inlet flow channels and the number of the liquid outlet flow channels are both four; the angle between the extension direction of the first guide section of each liquid inlet flow channel and the extension direction of the fourth guide section of the adjacent liquid outlet flow channel is 45°.

10. The end plate of the motor rotor according to claim 9, characterized in that: The second guide section of each liquid inlet flow channel and the third guide section of each liquid outlet flow channel are consistent in shape and structure.

11. The end plate of the motor rotor according to claim 9 or 10, characterized in that: There are two end plates, namely the first end plate and the second end plate, and the first end plate and the second end plate are respectively covered on the two ends of the rotor core; the four liquid inlet channels of the first end plate are respectively connected to the four liquid outlet channels of the second end plate in a one-to-one correspondence, and the four liquid inlet channels of the second end plate are respectively connected to the four liquid outlet channels of the first end plate in a one-to-one correspondence.

12. A motor rotor assembly, characterized in that: It comprises a rotor shaft, a rotor core and an end plate of a motor rotor as claimed in any one of claims 1 to 11, wherein the rotor core is sleeved on the rotor shaft, and the end plate is sleeved on the rotor shaft and covers the end of the rotor core; a coolant outlet is provided on the side wall of the rotor shaft, and a coolant inlet is provided on the end surface of the rotor core; a first end of the first guide section of the end plate is connected to the coolant outlet on the rotor shaft, and the second guide section of the end plate is connected to the coolant inlet on the rotor core.

13. A motor, characterized in that: Comprising the motor rotor assembly as claimed in claim 12.

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