A rotor assembly and a motor

Abstract

The present application discloses a rotor assembly and a motor, belonging to the technical field of oil-cooled motors, wherein the rotor assembly comprises a rotating shaft, an iron core and two pressure rings, the iron core and the two pressure rings are sleeved on the rotating shaft, the two pressure rings are respectively arranged at the two ends of the iron core in the axial direction, the diameter of the pressure ring is smaller than the diameter of the iron core, a magnetic steel groove is provided on the iron core, and the magnetic steel groove runs through the two end faces of the iron core in the axial direction; wherein the iron core is formed by stacking multiple layers of laminations, and the two outermost laminations in the multiple layers of laminations are provided with magnetic steel through holes and oil drain through holes, the magnetic steel through holes are correspondingly connected with the magnetic steel grooves, the oil drain through holes include a first oil drain hole with an axial projection outside the pressure ring and / or a second oil drain hole with an axial projection on the pressure ring, the first oil drain hole is connected with the magnetic steel through hole, an oil drain groove is provided on one end face of the pressure ring facing the iron core, and the second oil drain hole is correspondingly connected with the oil drain groove. The present application solves the problem of rotor oil accumulation in the rotor assembly, and achieves the effect of avoiding rotor oil accumulation and reducing costs.

Description

Technical Field

[0001] The present application relates to the technical field of oil-cooled motors, and in particular to a rotor assembly and a motor. Background Art

[0002] In the current new energy vehicle industry, the rotor assembly of the oil-cooled permanent magnet synchronous motor mainly includes a rotating shaft and an iron core, wherein the iron core is fixed mainly through the cooperation of a shoulder, a balancing disc and an interference ring arranged on the rotating shaft. The problem with this rotor assembly is that two balancing discs are arranged between the shoulder and the iron core and between the iron core and the interference ring respectively, and the balancing discs block the magnetic steel slots of the iron core, so that the oil in the magnetic steel slots cannot be effectively discharged during the operation of the motor rotor, causing oil accumulation in the rotor, which in turn causes the motor performance to decrease. Utility Model Content

[0003] The main purpose of the present application is to provide a rotor assembly and a motor, aiming to solve the technical problem of rotor oil accumulation in the rotor assembly in the related art.

[0004] To achieve the above objectives, this application adopts the following technical solutions:

[0005] In the first aspect, the present application proposes a rotor assembly, including a rotating shaft, an iron core and two pressure rings, wherein the iron core and the two pressure rings are sleeved on the rotating shaft, and the two pressure rings are respectively arranged at two ends of the iron core in the axial direction, and the diameter of the pressure ring is smaller than the diameter of the iron core, and a magnetic steel groove is opened on the iron core, and the magnetic steel groove runs through two end surfaces of the iron core in the axial direction;

[0006] Among them, the iron core is formed by stacking multiple layers of laminations, and the two outermost laminations in the multiple layers are both provided with magnetic steel through holes and oil drain holes, the magnetic steel through holes are correspondingly connected with the magnetic steel grooves, the oil drain holes include a first oil drain hole whose axial projection is located outside the pressure ring and / or a second oil drain hole whose axial projection is located on the pressure ring, the first oil drain hole is connected with the magnetic steel through hole, an oil drain groove is provided on one end surface of the pressure ring facing the iron core, and the second oil drain hole is correspondingly connected with the oil drain groove.

[0007] Optionally, in the above rotor assembly, the first oil drain hole includes holes respectively arranged at both ends of each magnetic steel through hole.

[0008] Optionally, in the above rotor assembly, the first oil drain hole includes a first hole and a second hole with the same hole diameter or a third hole and a fourth hole with different hole diameters.

[0009] Optionally, in the above rotor assembly, the oil drain groove includes an inner ring groove and a plurality of extension grooves, the extension grooves extend radially along the pressure ring, one end of the extension grooves is connected to the inner ring groove, and the other end of the extension grooves extends to the outer wall of the pressure ring.

[0010] Optionally, in the above rotor assembly, the multiple extension grooves include four extension grooves evenly spaced apart along the circumference of the pressure ring.

[0011] Optionally, in the above rotor assembly, a plurality of second oil drain holes are spaced apart and distributed along the circumference of the core on the laminations to form a plurality of circles, and the number of the inner annular grooves is consistent with the number of circles formed by the plurality of second oil drain holes.

[0012] Optionally, in the above-mentioned rotor assembly, when the oil drain groove includes a plurality of inner ring grooves, connecting grooves are provided between the inner ring grooves, the number of the connecting grooves is consistent with the number of the extension grooves, and the connecting grooves and the extension grooves are located in the same radial direction of the pressure ring.

[0013] Optionally, in the above rotor assembly, a deweighting groove is further provided on the core, and the deweighting groove runs through two axial end surfaces of the core.

[0014] Optionally, in the above rotor assembly, the axial projection of the deweighting groove is located outside the pressure ring or on the outer edge of the pressure ring.

[0015] In a second aspect, the present application further proposes a motor, comprising:

[0016] stator;

[0017] The rotor comprises the rotor assembly as described above, and the rotor is rotatably arranged inside the stator.

[0018] The above one or more technical solutions provided by this application may have the following advantages or at least achieve the following technical effects:

[0019] The present application proposes a rotor assembly and a motor, which are composed of a rotating shaft, an iron core and two pressure rings. The iron core and the two pressure rings are sleeved on the rotating shaft. The two pressure rings are respectively arranged at the two ends of the iron core in the axial direction and the diameter of the pressure ring is smaller than the diameter of the iron core, which plays the role of fixing the iron core and acting as a deweighting carrier; a magnetic steel groove is provided on the iron core, and the magnetic steel groove runs through the two end faces of the iron core in the axial direction. The iron core is formed by stacking multiple layers of laminations. The two outermost laminations in the multiple layers are provided with magnetic steel through holes and oil leakage through holes, and the magnetic steel through holes are correspondingly connected with the magnetic steel grooves. The oil leakage through holes include a first oil leakage hole, and the axial projection of the first oil leakage hole is located outside the pressure ring. The pressure ring will not block the first oil leakage hole. The first oil leakage hole is connected with the magnetic steel through hole, which expands the oil drainage space at the magnetic steel groove on the outermost lamination, so that the oil in the magnetic steel groove can be smoothly discharged through the magnetic steel through holes and the first oil leakage holes connected on the two end faces of the iron core. The oil drain hole comprises a second oil drain hole, the axial projection of the second oil drain hole is located on the pressure ring, an oil drain groove is arranged on the end face of the pressure ring facing the iron core, the second oil drain hole is correspondingly connected to the oil drain groove, although the pressure ring blocks the second oil drain hole, the oil discharged from the second oil drain hole can be discharged again through the oil drain groove, so that the oil that may be accumulated between the iron core and the pressure ring can be discharged smoothly through the cooperation of the second oil drain hole and the oil drain groove, which can avoid the dead space between the iron core and the pressure ring causing the deterioration of the dynamic balance of the rotor; the rotor assembly of the present application achieves the effect of avoiding oil accumulation in the rotor. Compared with the scheme in the related art, the shoulder and the balancing plate on the rotating shaft are cancelled, and the types of components of the rotor assembly are reduced, which not only reduces the material cost, but also simplifies the assembly process of the rotor assembly and reduces the processing cost, thereby achieving the effect of reducing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, 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 the structures shown in these drawings without paying any creative work.

[0021] Figure 1 It is a structural schematic diagram of a rotor assembly in the related art;

[0022] Figure 2 This is a schematic structural diagram of the first embodiment of the rotor assembly of the present application;

[0023] Figure 3 This is a schematic diagram of the three-dimensional structure of the core in the first embodiment of the rotor assembly of the present application;

[0024] Figure 4 This is a schematic diagram of the planar structure of the core in the first embodiment of the rotor assembly of the present application;

[0025] Figure 5 This is a schematic diagram of the three-dimensional structure of the pressure ring in the first embodiment of the rotor assembly of the present application;

[0026] Figure 6 This is a schematic diagram of the planar structure of the pressure ring in the first embodiment of the rotor assembly of the present application;

[0027] Figure 7 This is a schematic diagram of the three-dimensional structure of the core in the second embodiment of the rotor assembly of the present application;

[0028] Figure 8 It is a schematic diagram of the planar structure of the core in the second embodiment of the rotor assembly of the present application.

[0029] Description of Figure Numbers:

[0030]

[0031]

[0032] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] It should be noted that in the embodiments of the present application, all directional indications (such as up, down, left, right, front, back...) are only used to explain the relative positional relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In the present application, the term "include", "comprise" or any other variant thereof is intended to cover non-exclusive inclusion, so that the device or system including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a device or system. In the absence of more restrictions, the elements defined by the sentence "include..." do not exclude the existence of other identical elements in the device or system including the element. The meaning of "and / or" appearing in the full text includes three parallel schemes, taking "A and / or B" as an example, including scheme A, or scheme B, or schemes that A and B meet at the same time. In this application, unless otherwise clearly specified and limited, the terms "connection", "fixed", etc. should be understood in a broad sense. For example, "connection" 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. In this application, if there is a description involving "first", "second", etc., the description of "first", "second", etc. is only for descriptive purposes, and cannot be understood as indicating or implying its relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In this application, the use of suffixes such as "module", "component" or "unit" used to represent elements is only to facilitate the description of this application, and it has no specific meaning in itself. Therefore, "module", "component" or "unit" can be used in a mixed manner. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, the technical solutions of the various embodiments may be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0035] An analysis of the relevant technologies reveals that in the current new energy automobile industry, the rotor assembly 10 of the oil-cooled permanent magnet synchronous motor mainly includes a rotating shaft 11 and an iron core 12. Figure 1The figure shows a schematic diagram of the structure of the rotor assembly in the related art, wherein the fixation of the core 12 is mainly achieved by the cooperation of the shoulder 13, the balancing disc 14 and the interference ring 15 arranged on the rotating shaft 11. Specifically, the shoulder 13 plays the role of a supporting base at one end, and after the first balancing disc 14 is placed, the core 12 is press-fitted, and then the second balancing disc 14 is placed, and finally the interference ring 15 is used to complete the fixation of the other end to form the rotor assembly 10.

[0036] Should Figure 1 The rotor assembly 10 shown uses two balancing disks 14 which are respectively arranged between the shoulder 13 and the core 12 and between the core 12 and the interference ring 15. The balancing disks 14 block the magnetic steel slots of the core 12, so that the oil in the magnetic steel slots cannot be effectively discharged during the operation of the motor rotor, causing oil accumulation in the rotor, thereby causing the motor NVH (noise, vibration and harshness) performance to deteriorate, resulting in reduced motor performance.

[0037] Moreover, the rotor assembly 10 needs to be provided with a shoulder 13 on the rotating shaft 11, which has high production requirements for the rotating shaft 11 and increases the production cost. In addition, five kinds of materials are used, which not only makes the assembly process cumbersome and is not conducive to improving the production efficiency on the rotor production line, but also further increases the material cost. Therefore, there is still a problem of high cost.

[0038] In view of the technical problems of rotor oil accumulation and high cost in the rotor assembly in the related art, the present application provides a rotor assembly and a motor, and the specific embodiments and implementation methods are as follows:

[0039] Embodiment 1

[0040] Reference Figures 2 to 6 , a first embodiment of the rotor assembly of the present application is proposed, and the rotor assembly can be applied to the motor of a new energy vehicle, such as an oil-cooled permanent magnet synchronous motor, as a rotor, and then cooperate with a stator to form a motor. Figure 2 This is a schematic structural diagram of the first embodiment of the rotor assembly of the present application. The rotor assembly 20 may include a rotating shaft 21, an iron core 22 and two pressure rings 23;

[0041] The iron core 22 and the two pressure rings 23 are sleeved on the rotating shaft 21. The two pressure rings 23 are respectively arranged at two ends of the iron core 22 in the axial direction. The diameter of the pressure ring 23 is smaller than the diameter of the iron core 22. The iron core 22 is provided with a magnetic steel groove 220, which passes through the two end faces of the iron core 22 in the axial direction.

[0042] Among them, the iron core 22 is formed by stacking multiple layers of laminations, and the two outermost laminations in the multiple layers are both provided with magnetic steel through holes 221 and oil drain holes 200. The magnetic steel through holes 221 are correspondingly connected with the magnetic steel grooves 220. The oil drain holes 200 include a first oil drain hole 201 whose axial projection is located outside the pressure ring 23 and / or a second oil drain hole 202 whose axial projection is located on the pressure ring 23. The first oil drain hole 201 is connected with the magnetic steel through hole 221. An oil drain groove 230 is provided on the end surface of the pressure ring 23 facing the iron core 22, and the second oil drain hole 202 is correspondingly connected with the oil drain groove 230.

[0043] like Figure 2 As shown, relative to Figure 1 The rotating shaft 11 of the rotor assembly 10 shown in the figure and the rotating shaft 21 of the rotor assembly 20 are provided with the shoulder 13 removed. In the related art, the rotating shaft 11 provided with the shoulder 13 is generally formed in one piece with the rotating shaft 11, so that the production Figure 1 The processing technology of the rotating shaft 11 shown is relatively complicated. Figure 2 The rotating shaft 21 shown can reduce the complexity of processing.

[0044] The pressure ring 23 is sleeved on the rotating shaft 21 and is located at both ends of the core 22 in the axial direction. Different from the balancing plate 14 with the same diameter as the core arranged at the end of the core in the related art, the diameter of the pressure ring 23 arranged at both ends of the core 22 in this embodiment is smaller than the diameter of the core 22, that is, the distance between the pressure ring 23 and the rotating shaft 21 is smaller than the distance between the magnetic steel and the rotating shaft 21, and the pressure ring 23 and the rotating shaft 21 are interference fit, that is, the outer diameter of the position where the pressure ring 23 is installed on the rotating shaft 21 can be larger than the inner diameter of the pressure ring 23. Pressure rings 23 are sleeved on both ends of the core 22, and the outer diameters of the two positions where the pressure ring 23 is sleeved on the rotating shaft 21 can be kept consistent. When it is necessary to Figure 1 When the rotor assembly 10 shown is improved, since the right side of the original rotor assembly 10 is already provided with an interference ring 15, only the left side of the rotating shaft 11 can be improved to keep its outer diameter consistent with the right side, and an interference ring 15 of the same structure is added. These two interference rings 15 are used as a pressure ring 23, so that the shoulder 13 and the two balancing disks 14 are removed, and two interference rings are used to directly fix the iron core 22, thereby further reducing the process complexity when producing the rotating shaft 21.

[0045] In this embodiment, the overall structure of the rotor assembly 20 is improved, the traditional shoulder structure is eliminated, and the original interference ring is used instead. The balancing discs on both sides of the core are also eliminated, and the weight removal function of the balancing discs is integrated into the pressure ring 23. The original five materials are changed to three materials, which saves the material cost of the shaft 21 itself and the overall material cost of the rotor assembly 20, and improves the compatibility of the shaft 21, so that the shaft 21 can meet the requirements of different axial space arrangements. Moreover, during the process assembly of the rotor assembly 20, one clamping can be reduced, which improves the assembly efficiency of the rotor assembly 20 and further reduces the production cost.

[0046] In this embodiment, when assembling the rotor assembly 20, the first pressing ring 23, the iron core 22 and the second pressing ring 23 are sequentially pressed onto the rotating shaft, and the pressing ring 23 plays the role of fixing the iron core 22 and acting as a weight removal carrier. The spatial position of the iron core 22 relative to the rotating shaft 21 is determined by the spatial position of the first pressing ring 23, and the spatial position of the first pressing ring 23 can be ensured by the tooling during the process assembly and is set based on the actual situation, which is not limited here.

[0047] Figure 3 Schematic diagram of the three-dimensional structure of the core in this embodiment, Figure 4 Schematic diagram of the plane structure of the core in this embodiment; Figure 3 and Figure 4 As shown, the core 22 is formed by stacking multiple layers of laminations, and the two outermost laminations of the multiple layers of the core 22 are provided with magnetic steel through holes 221 ( Figure 3 and Figure 4 The core 22 is provided with a magnetic steel slot 220 ( Figure 3 and Figure 4(not shown), used to place magnetic steel so that the magnetic steel passes through the two axial end faces of the core 22. The specific position of the magnetic steel slot 220 and the arrangement of the magnetic steel can be set according to actual needs, which are not limited here. Correspondingly, the size, distribution density, position, shape, number, etc. of the magnetic steel through holes 221 and the oil drain holes 200 provided on the two outermost laminations in the multi-layer laminations of the core 22 can also be set accordingly according to the setting of the magnetic steel slot 220 on the core 22, and can also be set accordingly in combination with the setting of the de-stressing slot on the core 22, which are not limited here. In other words, different cores 22 may have different sizes, distribution density, positions, shapes, numbers, etc. of the oil drain holes 200 on the two outermost laminations in the multi-layer laminations. The arrangement of the magnetic steel through holes 221 on the left outermost lamination of the same core 22 must be consistent with the arrangement of the magnetic steel through holes 221 on the right outermost lamination, because the magnetic steel through holes 221 are connected to the magnetic steel slots 220 correspondingly, and the magnetic steel slots 220 penetrate through the multiple layers of laminations and connect the two end faces of the core 22, but the settings of the oil drain holes 200 on the two outermost laminations may be consistent or inconsistent.

[0048] Specifically, Figure 3 and Figure 4 As shown, the oil drain hole 200 may include a first oil drain hole 201 whose axial projection is located outside the pressure ring 23; it may also include a second oil drain hole 202 whose axial projection is located on the pressure ring 23; it may also include both the first oil drain hole 201 whose axial projection is located outside the pressure ring 23 and the second oil drain hole 202 whose axial projection is located on the pressure ring 23. This case is taken as an example for explanation in this embodiment.

[0049] Among them, the first oil drain hole 201 is connected with the magnetic steel through hole 221, which is actually connected with the magnetic steel slot 220. The first oil drain hole 201 enlarges the slot of the magnetic steel slot 220, thereby increasing the oil discharge space at the magnetic steel slot 220 on the outermost lamination of the core 22, and the pressure ring 23 will not block the first oil drain hole 201, so that the oil in the magnetic steel slot 220 can be smoothly discharged from the end surface of the outermost lamination close to the pressure ring 23, specifically, it can be smoothly discharged through the connected magnetic steel through hole 221 and the first oil drain hole 201, thereby avoiding the existence of dead space at the magnetic steel slot 220 of the core 22, such as the existence of a gap between the outermost lamination of the core 22 and its adjacent lamination, which may cause the dynamic balance of the rotor to deteriorate.

[0050] Figure 5 Schematic diagram of the three-dimensional structure of the pressure ring in this embodiment, Figure 6 Schematic diagram of the planar structure of the pressure ring in this embodiment; Figure 5 and Figure 6 As shown, an oil drain groove 230 is provided on one end surface of the pressure ring 23 facing the core 22. Figure 3 and Figure 4The axial projection of the second oil drain hole 202 is shown on the pressure ring 23. Figure 2 In the rotor assembly 20 shown, the pressure ring 23 blocks the second oil drain hole 202, and the oil cannot be directly discharged from the second oil drain hole 202. Therefore, an oil drain groove 230 is correspondingly arranged on the pressure ring 23, and the second oil drain hole 202 is correspondingly connected to the oil drain groove 230. At this time, the oil discharged from the second oil drain hole 202 can be discharged again through the oil drain groove 230, so that the oil that may be accumulated between the iron core 22 and the pressure ring 23, especially between the outermost lamination and the pressure ring 23, can be smoothly discharged through the cooperation of the second oil drain hole 202 and the oil drain groove 230, thereby avoiding the dead space between the iron core 22 and the pressure ring 23, such as the gap between the outermost lamination of the iron core 22 and the pressure ring 23, which may cause the dynamic balance of the rotor to deteriorate.

[0051] In this embodiment, the oil leakage hole 200 includes a first oil leakage hole 201 and a second oil leakage hole 202. When the pressure ring 23 itself does not block the magnetic steel through hole 221 and the first oil leakage hole 201 set on the end surface of the iron core 22, the oil in the magnetic steel groove 220 can be discharged more efficiently and comprehensively through the first oil leakage hole 201. Even if the pressure ring 23 blocks the second oil leakage hole 202 set on the end surface of the iron core 22, the oil accumulated between the iron core 22 and the pressure ring 23 can still be smoothly discharged through the oil leakage groove 230, thereby achieving the effect of effectively avoiding oil accumulation in the rotor.

[0052] The rotor assembly of the present embodiment is composed of a rotating shaft, an iron core and two pressure rings. The iron core and the two pressure rings are sleeved on the rotating shaft. The two pressure rings are respectively arranged at the two ends of the iron core in the axial direction, and play the role of fixing the iron core and serving as a deweighting carrier. A magnetic steel groove is opened on the iron core, and the magnetic steel groove runs through the two end faces of the iron core in the axial direction. The iron core is formed by stacking multiple layers of laminations. The two outermost laminations in the multiple layers are provided with magnetic steel through holes and oil leakage through holes. The magnetic steel through holes are connected with the magnetic steel grooves correspondingly. The oil leakage through holes include a first oil leakage hole. The axial projection of the first oil leakage hole is located outside the pressure ring. The pressure ring will not block the first oil leakage hole. The first oil leakage hole is connected with the magnetic steel through hole, which expands the oil drainage space at the magnetic steel groove on the outermost lamination, so that the oil in the magnetic steel groove can be smoothly discharged through the magnetic steel through holes and the first oil leakage holes connected on the two end faces of the iron core, which can avoid the magnetic steel groove of the iron core. The existence of a dead cavity causes the dynamic balance of the rotor to deteriorate; the oil drain hole includes a second oil drain hole, the axial projection of the second oil drain hole is located on the pressure ring, and an oil drain groove is arranged on the end surface of the pressure ring facing the iron core, the second oil drain hole is correspondingly connected to the oil drain groove, although the pressure ring blocks the second oil drain hole, the oil discharged from the second oil drain hole can be discharged again through the oil drain groove, so that the oil that may be accumulated between the iron core and the pressure ring can be smoothly discharged through the cooperation of the second oil drain hole and the oil drain groove, which can avoid the dead cavity between the iron core and the pressure ring causing the dynamic balance of the rotor to deteriorate; the rotor assembly of the present application achieves the effect of avoiding oil accumulation in the rotor. Compared with the solutions in the related technology, the shoulder and the balancing plate on the rotating shaft are cancelled, and the types of components of the rotor assembly are reduced, which not only reduces the material cost, but also simplifies the assembly process of the rotor assembly and reduces the processing cost, thereby achieving the effect of reducing cost.

[0053] Embodiment 2

[0054] Reference Figures 2 to 8 , based on the first embodiment, a second embodiment of the rotor assembly of the present application is proposed. Figure 7 Schematic diagram of the three-dimensional structure of the core in this embodiment, Figure 8 Schematic diagram of the planar structure of the core in this embodiment.

[0055] Alternatively, if Figure 7 and Figure 8 As shown, the first oil leakage hole 201 may include holes respectively arranged at both ends of each magnetic steel through hole 221 .

[0056] Specifically, for the outermost laminations of the core 22, the first oil leakage holes 201 are holes respectively arranged at the two ends of the magnetic steel through hole 221 corresponding to the magnetic steel slot 220. One hole may be arranged at each end, or multiple holes may be arranged at each end, but the multiple holes need to be interconnected. Here, the first oil leakage hole 201 includes two holes as an example. The two first oil leakage holes 201 are respectively at the two ends of the magnetic steel through hole 221 corresponding to the magnetic steel slot 220, which greatly expands the oil leakage space at the magnetic steel slot 220, so that the oil discharged from the magnetic steel slot 220 is discharged to both sides respectively, thereby improving the oil leakage effect and efficiency.

[0057] In a specific implementation of this embodiment, Figure 7 and Figure 8 As shown, the first oil leakage hole 201 includes a first hole 2011 and a second hole 2012 with the same hole diameter or a third hole 2013 and a fourth hole 2014 with different hole diameters.

[0058] Specifically, the two first oil leakage holes 201 are disposed at both ends of the magnetic steel through hole 221, and the two first oil leakage holes 201 may have the same or different hole diameters. Figure 7 In the embodiment, the two first oil leakage holes 201 disposed at both ends of the smaller magnetic steel through hole 221 are the first hole 2011 and the second hole 2012 with the same aperture; the two first oil leakage holes 201 disposed at both ends of the larger magnetic steel through hole 221 are the third hole 2013 and the fourth hole 2014 with different apertures. It can be understood that the first hole 2011 and the second hole 2012 are a group of oil leakage holes corresponding to a magnetic steel slot 220, the third hole 2013 and the fourth hole 2014 are a group of oil leakage holes corresponding to a magnetic steel slot 220, and a magnetic steel can be placed in a magnetic steel slot 220 between a group of oil leakage holes.

[0059] In this embodiment, Figure 3 and Figure 4 As shown, the dotted line S1 and S2 is one pole of the motor, and the dotted line S2 and S3 is the other pole of the motor. The magnetization directions of the two poles are opposite. Figure 7 and Figure 8 It is known that this embodiment has four magnetic steel slots 220 in one pole, that is, four magnetic steel through holes 221 , and correspondingly, eight first oil leakage holes 201 .

[0060] During the rotation of the rotor, under the action of centrifugal force, the first oil leakage hole 201 located on the outer side in the radial direction of the core 22 has a better oil leakage effect. Based on this, the smaller magnetic steel through hole 221 itself does not need to discharge too much oil, and the distance between the two first oil leakage holes 201 in the radial direction of the core 22 is not far, so in actual applications, the apertures of the two first oil leakage holes 201 can be consistent or inconsistent; but the larger magnetic steel through hole 221 needs to discharge more oil, and the distance between the two first oil leakage holes 201 in the radial direction of the core 22 is also far, the outer first oil leakage hole 201 has a better oil leakage effect, and the inner first oil leakage hole 201 has a poorer oil leakage effect, so the aperture of the third hole 2013 can be set larger, and the aperture of the fourth hole 2014 can be set smaller, that is, the apertures of the third hole 213 and the fourth hole 2014 are inconsistent. In actual applications, any one of the two configurations can be selected as needed, or you can choose Figure 7 and Figure 8 As shown, for different settings of the magnetic steel slots 220 on an iron core 22 , corresponding configurations are selected for different magnetic steel slots 220 .

[0061] Alternatively, if Figure 5 and Figure 6 As shown, the oil drain groove 230 includes an inner ring groove 231 and a plurality of extension grooves 232 . The extension grooves 232 extend radially along the pressure ring 23 . One end of the extension groove 232 is connected to the inner ring groove 231 , and the other end of the extension groove 232 extends to the outer wall of the pressure ring 23 .

[0062] Specifically, the pressure ring 23 may be an integrated structure, and a groove is provided on one end surface thereof facing the core 22 to form an oil drain groove 230. The oil drain groove 230 includes an annular groove structure concentric with the pressure ring 23 to form an inner annular groove 231, and a plurality of strip-shaped groove structures are provided toward the outer side of the pressure ring 23 based on the inner annular groove 231 to form an extension groove 232. The inner annular groove 231 corresponds to the second oil drain hole 202, and the axial projection of the second oil drain hole 202 may be located in the inner annular groove 231, so that the oil discharged from the second oil drain hole 202 may enter the inner annular groove 231; the oil in the inner annular groove 231 is discharged to the outside through the extension groove 232 during the rotation of the rotor.

[0063] It should be noted that the number, width and shape of the multiple extension grooves 232 connected to the inner ring groove 231 can also be set according to actual needs and are not limited here; for example, the extension grooves 232 can be set to a curved arc shape so as to discharge oil outward by the centrifugal force of the rotor rotation to improve the oil discharge effect, and can also be set to a straight groove shape to reduce the processing difficulty; for example, the number of extension grooves 232 can be increased to improve the oil drainage effect, but the more extension grooves 232 there are, the higher the processing cost. Correspondingly, the number of extension grooves 232 can be reduced to save processing costs.

[0064] In a specific implementation of this embodiment, Figure 5 and Figure 6 As shown, the plurality of extension grooves 232 include four extension grooves evenly spaced apart along the circumference of the pressure ring 23 .

[0065] Specifically, between the four extension grooves 232, two adjacent extension grooves 232 form an angle of 90 degrees. Four is the optimal number determined after multiple tests, which does not increase the processing cost and has a good oil leakage effect.

[0066] Optionally, the plurality of second oil drain holes 202 are spaced apart and distributed along the circumference of the core 22 on the laminations to form a plurality of circles, and the number of the inner annular grooves 231 is consistent with the number of circles formed by the plurality of second oil drain holes 202 .

[0067] Specifically, the second oil drain hole 202 is an oil drain hole on the outermost lamination of the core 22 corresponding to the inner ring groove 231 of the pressure ring 23. There can be multiple of them, and they are spaced apart along the circumference of the core 22 to form a circle, and the number of the corresponding inner ring groove 231 is one. Figure 3-Figure 6 If the core 22 is relatively large and there is more space between the pressure ring 23 and the core 22, the plurality of second oil drain holes 202 may be spaced and distributed along the circumference of the core 22 to form two or more circles. Correspondingly, the number of inner ring grooves 231 on the oil drain groove 230 increases accordingly, and the axial projection of each circle of second oil drain holes 202 falls within the corresponding inner ring grooves 231.

[0068] In a specific implementation of this embodiment, when the oil drain groove 230 includes multiple inner ring grooves 231, connecting grooves are arranged between each inner ring groove 231, the number of connecting grooves is consistent with the number of extension grooves 232, and the connecting grooves and the extension grooves 232 are located in the same radial direction of the pressure ring 23.

[0069] Specifically, when there are multiple inner ring grooves 231 arranged on the end surface of the pressure ring 23 facing the iron core 22, these inner ring grooves 231 can all be annular structures concentric with the pressure ring 23, and in the radial direction of the pressure ring 23, a plurality of extension grooves 232 extending outward are arranged on the outermost inner ring groove 231, for example, four; between the remaining inner ring grooves 231, a connecting groove connecting two adjacent inner ring grooves 231 can be arranged, that is, one end of the connecting groove is connected to an inner ring groove 231 located radially on the inside, and the other end is connected to an adjacent inner ring groove 231 located radially on the outside; the number of connecting grooves connecting two inner ring grooves 231 can be consistent with the number of extension grooves 232, for example, also four. Preferably, the extension groove 232 can be a straight groove or a curved groove, and correspondingly, the connecting groove can also be a straight groove or a curved groove. The shape of the extension groove 232 and the connecting groove are not required to be consistent. However, when the extension groove 232 is a straight groove and extends to the outside along the radial direction of the pressure ring 23, the connecting groove can also be set as a straight groove and be in the same radial direction as the extension groove 232, so that the innermost inner ring groove 231 discharges the oil discharged from the second oil drain hole 202 through the inner ring groove 231, the connecting groove and the extension groove 232 in sequence, and will not flow to other positions of the inner ring groove 231 of other circles, and only pass through the junction of the connecting groove and the extension groove 232 thereon, thereby quickly discharging the oil to the outside of the rotor assembly 20, thereby improving the oil drainage efficiency and oil drainage effect.

[0070] Alternatively, if Figure 3 and Figure 4 As shown, a deweighting groove 222 is further provided on the core 22 , and the deweighting groove 222 passes through two end surfaces of the core 22 in the axial direction.

[0071] During the operation of the motor, due to reasons such as the motor's structural design or component quality, some weight distribution is uneven, which will cause the motor to be unbalanced during operation. In order to ensure the normal operation of the motor and extend the service life of the motor, the motor needs to be deweighted.

[0072] Specifically, the rotor assembly 20 removes the balancing disk, and two pressure rings 23 are respectively arranged at the two ends of the core 22 in the axial direction. The pressure rings 23 can play the role of a weight removal carrier, but the weight removal effect may not be very good. In this case, a weight removal groove 222 can be opened on the core 22. Similar to the magnetic steel groove 220, the weight removal groove 222 also runs through the two end faces of the core 22 in the axial direction. The weight removal groove 222 can be Figure 3 and Figure 4The circular groove or triangular groove shown is used to form a magnetic isolation bridge between the two magnetic steel grooves 220. It can be understood that the position, size, distribution, etc. of the oil leakage through hole 200, and the aperture size of the first oil leakage hole 201 and the aperture size, number, position, distribution, number of circles formed, etc. of the second oil leakage hole 202 can be set according to the specific conditions of the magnetic steel groove 220 and the deweighting groove 222 in the core 22.

[0073] The pressure ring 23 acts as a deweighting carrier, and a deweighting groove 222 is opened on the iron core 22 to deweight the motor, which can reduce the vibration and noise of the motor, reduce the wear and damage of the motor components, ensure the reliability and stability of the motor, extend the service life of the motor, and avoid other mechanical equipment failures caused by motor imbalance, thereby ensuring the stable operation of the motor.

[0074] In a specific implementation of this embodiment, the axial projection of the deweighting groove 222 is located outside the pressing ring 23 or on the outer edge of the pressing ring 23 .

[0075] Specifically, the pressure ring 23 partially blocks the outermost laminations of the core 22, and the axial projection of the deweighting groove 222 can be located between the axial projection of the first oil drain hole 201 and the axial projection of the second oil drain hole 202 in the radial direction, for example Figure 3 and Figure 4 As shown, the second oil drain hole 202 is located at the innermost side of the laminate, the first oil drain hole 201 is located at the outer side of the laminate, and the notch of the deweighting groove 222 is located between the first oil drain hole 201 and the second oil drain hole 202. In this case, the axial projection of the deweighting groove 222 may be located outside the pressure ring 23, that is, the pressure ring 23 will not completely block the deweighting groove 222. The axial projection of the deweighting groove 222 may also be located on the outer edge of the pressure ring 23, that is, the pressure ring 23 partially blocks the deweighting groove 222. In this way, the oil in the deweighting groove 222 can be discharged normally without oil accumulation.

[0076] Alternatively, if Figure 3 and Figure 4 ,as well as Figure 7 and Figure 8 As shown, a process buckle point 223 may also be provided on the core 22 to be used as a clamping and fixing point when the rotor assembly 20 is assembled. It is understandable that the process buckle point 223 does not have to penetrate the core 22 .

[0077] Alternatively, if Figure 8 As shown, an oil groove 2201 can also be axially arranged in the magnetic steel groove 220, so that when a magnet is assembled in the magnetic steel groove 220, the oil can be better discharged to the two end surfaces of the core 22 through the oil groove 2201, reach the magnetic steel through hole 221 on the outermost lamination corresponding to the magnetic steel groove 220, and then be discharged to the outside of the rotor through the first oil drain hole 201.

[0078] Although the second oil leakage hole 202 in this embodiment is only provided on the outermost lamination of the core 22, in actual application, the corresponding position can also be selected to be slotted in the middle lamination of the core 22, so that the second oil leakage holes 202 on the two end faces of the core 22 axially penetrate the two ends of the core 22. That is, an inner groove can also be provided on the core 22, which penetrates the two ends of the core 22 and is located on the inner side of the magnetic steel groove 220, and the inner groove is correspondingly connected with the second oil leakage hole 202, so that the oil between the core 22 and the rotating shaft 21 can be discharged smoothly through the inner groove, the second oil leakage hole 202 and the oil leakage groove 230 in sequence.

[0079] The rotor assembly of this embodiment is a rotor structure used in an oil-cooled permanent magnet synchronous motor that integrates cost reduction and NVH optimization functions. The shaft shoulder and the balancing disk on both sides of the core in the rotor assembly in the related art are removed, and two pressure rings are used to fix the core and serve as a weight removal carrier. While reducing the cost of the entire rotor, it also improves the compatibility of the shaft, so that the shaft can meet the needs of different axial space arrangements. In addition, a first oil drain hole is specifically opened at the magnetic steel groove of the outermost lamination of the core, and an oil drain groove is opened on the pressure ring when the second oil drain hole is opened on the outermost lamination. The accumulated oil near the magnetic steel groove of the outermost lamination of the core and the accumulated oil between the core and the pressure ring are discharged in two ways, respectively, ensuring that the oil can be discharged smoothly during the operation of the rotor, and effectively improving the NVH performance of the rotor during operation.

[0080] Embodiment 3

[0081] This embodiment provides a motor, which may include:

[0082] stator;

[0083] A rotor, comprising the rotor assembly according to the first or second embodiment;

[0084] The rotor is rotatably arranged inside the stator.

[0085] Among them, the specific structure of the rotor assembly can refer to the above embodiments. Since this embodiment adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0086] It should be noted that the serial numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above embodiments are only optional embodiments of the present application and do not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the concept of the present application, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present application.

Claims

1. A rotor assembly, characterized in that: It comprises a rotating shaft, an iron core and two pressure rings, wherein the iron core and the two pressure rings are sleeved on the rotating shaft, the two pressure rings are respectively arranged at two ends of the iron core in the axial direction, the diameter of the pressure ring is smaller than the diameter of the iron core, and a magnetic steel groove is provided on the iron core, and the magnetic steel groove runs through two end faces of the iron core in the axial direction; Wherein, the iron core is formed by stacking multiple layers of laminations, and the two outermost laminations in the multiple layers are both provided with magnetic steel through holes and oil drain holes, the magnetic steel through holes are correspondingly connected with the magnetic steel grooves, the oil drain holes include a first oil drain hole whose axial projection is located outside the pressure ring and / or a second oil drain hole whose axial projection is located on the pressure ring, the first oil drain hole is connected with the magnetic steel through hole, and an oil drain groove is provided on one end face of the pressure ring facing the iron core, and the second oil drain hole is correspondingly connected with the oil drain groove.

2. The rotor assembly according to claim 1, characterized in that The first oil leakage hole includes holes respectively arranged at two ends of each of the magnetic steel through holes.

3. The rotor assembly according to claim 2, characterized in that The first oil leakage hole includes a first hole and a second hole with the same hole diameter or a third hole and a fourth hole with different hole diameters.

4. The rotor assembly according to claim 1, wherein: The oil drain groove comprises an inner ring groove and a plurality of extension grooves, wherein the extension grooves extend in the radial direction of the pressure ring, one end of the extension grooves is connected to the inner ring groove, and the other end of the extension grooves extends to the outer wall of the pressure ring.

5. The rotor assembly according to claim 4, characterized in that The plurality of extension grooves include four extension grooves evenly spaced apart along the circumference of the pressure ring.

6. The rotor assembly according to claim 4, characterized in that The plurality of second oil drain holes are spaced apart and distributed on the laminations along the circumference of the core to form a plurality of circles, and the number of the inner annular grooves is consistent with the number of circles formed by the plurality of second oil drain holes.

7. The rotor assembly according to claim 6, characterized in that When the oil drain groove includes a plurality of the inner ring grooves, connecting grooves are provided between the inner ring grooves, the number of the connecting grooves is consistent with the number of the extension grooves, and the connecting grooves and the extension grooves are located in the same radial direction of the pressure ring.

8. The rotor assembly according to any one of claims 1 to 7, characterized in that: The core is also provided with a de-weighting groove, which passes through two end faces of the core in the axial direction.

9. The rotor assembly according to claim 8, characterized in that The axial projection of the deweighting groove is located outside the pressure ring or on the outer edge of the pressure ring.

10. A motor, characterized in that: include: stator; A rotor, comprising a rotor assembly as claimed in any one of claims 1 to 9, wherein the rotor is rotatably disposed inside the stator.

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