Rotor punching sheet, rotor and motor

Abstract

The utility model discloses a rotor punching sheet, a rotor and a motor, and relates to the technical field of motors, the rotor punching sheet is provided with magnetic steel grooves, and the magnetic steel grooves are used for installing magnetic steel; the rotor punching sheet is further provided with a first liquid hole and a second liquid hole which extend in the axial direction of the rotor punching sheet, the first liquid hole is arranged close to the inner side of the rotor punching sheet, and the second liquid hole is located between the magnetic steel grooves and the outer side of the rotor punching sheet. According to the technical scheme provided by the utility model, the temperature rise of the rotor punching sheet and the magnetic steel is reduced, so that the demagnetization risk of the magnetic steel is reduced, and the power density of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a rotor punching sheet, a rotor and a motor. Background Art

[0002] The drive motor system, at the heart of electric vehicles, determines the vehicle's overall power performance. When the motor runs at high speeds, the rotor temperature increases significantly, increasing the risk of magnetic demagnetization and reducing the motor's power density. Utility Model Content

[0003] The main purpose of the present invention is to provide a rotor punching, a rotor and a motor, aiming to reduce the temperature rise of the rotor punching and the magnetic steel, thereby reducing the risk of magnetic steel demagnetization, and thus improving the power density of the motor.

[0004] To achieve the above-mentioned purpose, the present invention proposes a rotor punching, wherein the rotor punching is provided with a magnetic steel slot, and the magnetic steel slot is used to install the magnetic steel;

[0005] The rotor punching is further provided with a first liquid hole and a second liquid hole extending along its axial direction. The first liquid hole is arranged close to the inner side of the rotor punching, and the second liquid hole is located between the magnetic steel slot and the outer side of the rotor punching.

[0006] In one embodiment, the first liquid hole and the second liquid hole are elliptical holes.

[0007] In one embodiment, the major axes of the first liquid hole and the second liquid hole are parallel to the tangential direction of the rotor punching.

[0008] In one embodiment, the center of the rotor punching is taken as the vertex angle O, and the two end points of the second liquid hole on its long axis are A and B respectively, then ∠AOB>3°.

[0009] In one embodiment, the shortest distance between the second liquid hole and the outer side wall of the rotor punching is defined as c, and the shortest distance between the second liquid hole and the magnetic steel slot is defined as d, then: c / d>1 is satisfied.

[0010] In one embodiment, the magnetic steel slots include a first pair of magnetic steel slots and a second pair of magnetic steel slots, the first pair of magnetic steel slots being arranged radially relative to the rotor sheet axis and closer to the axis of symmetry than the second pair of magnetic steel slots, and symmetrically arranged relative to each other about a symmetry axis, the symmetry axis extending radially and passing through a midpoint of the rotor sheet, the first pair of magnetic steel slots being arranged at a first mechanical angle relative to each other, the first mechanical angle being an acute angle, and the second pair of magnetic steel slots being arranged at a second mechanical angle relative to each other;

[0011] The first liquid hole is located between the first magnetic steel slot and the inner side of the rotor punching;

[0012] When the angle of the second mechanism is an acute angle, the second liquid hole is located between the second pair of magnetic steel slots and the outer side of the rotor punching;

[0013] When the angle of the second mechanism is 180 degrees, the second liquid hole is located between the second pair of magnetic steel slots and the first magnetic steel slot.

[0014] In one embodiment, the first liquid holes and the second liquid holes are spaced apart from each other along the radial direction of the rotor punching sheet.

[0015] To achieve the above object, the present invention further provides a rotor comprising:

[0016] The rotor core comprises a plurality of stacked rotor punchings, wherein the rotor punchings are the rotor punchings described above, the first fluid holes of the plurality of rotor punchings forming a first oil path, and the second fluid holes of the plurality of rotor punchings forming a second oil path;

[0017] a first end plate, covering the first end of the rotor core, wherein a first oil guide groove is provided on a side of the first end plate close to the rotor core, and the first oil guide groove is connected to the oil inlet end of the first oil circuit;

[0018] a second end plate, covering the second end of the rotor core, wherein a second oil guide groove is provided on a side of the second end plate close to the rotor core, wherein the second oil guide groove is connected to the oil outlet end of the first oil circuit and the oil inlet end of the second oil circuit;

[0019] The rotating shaft is sequentially passed through the first end plate, the rotor core and the second end plate. An oil inlet is formed in the rotating shaft. A liquid hole is provided on the side wall of the rotating shaft. The liquid hole connects the oil inlet and the first oil guide groove.

[0020] In one embodiment, the rotor core includes a plurality of punching sheet groups, each of which includes a plurality of rotor punching sheets. Two adjacent punching sheet groups are deflected by a first circumferential angle along the circumference of the rotor core, the first liquid holes of two adjacent punching sheet groups are partially connected, and the second liquid holes of two adjacent punching sheet groups are partially connected.

[0021] To achieve the above object, the present invention further provides a motor comprising:

[0022] chassis;

[0023] a stator, disposed in the housing;

[0024] As the rotor mentioned above, the rotor is arranged inside the stator and an air gap is formed between the rotor and the stator;

[0025] The stator is provided with an oil blocking component, which extends to one side of the air gap and is used to block the coolant sprayed from the second oil circuit from entering the air gap.

[0026] In one embodiment, the stator comprises:

[0027] a stator core connected to the casing;

[0028] stator windings, wound around the stator slots of the stator core;

[0029] The first sealing cover is provided at one end of the stator core. The first sealing cover is provided close to the oil outlet end of the second oil circuit. The oil retaining component is integrated at a side of the first sealing cover close to the rotor.

[0030] In one embodiment, the stator comprises:

[0031] a stator core connected to the casing;

[0032] stator windings, wound around the stator slots of the stator core;

[0033] The oil-blocking component cooperates with the stator core.

[0034] In one embodiment, the oil blocking component is an annular structure.

[0035] The technical solution of the present invention is to provide a first liquid hole and a second liquid hole on the rotor punching, wherein the first liquid hole is arranged close to the inner side of the rotor punching, and the second liquid hole is located between the magnetic steel groove and the outer side of the rotor punching. When the rotor punching is applied to the rotor, the first liquid holes of the plurality of rotor punchings can constitute a first oil circuit, and the second liquid holes of the plurality of rotor punchings can constitute a second oil circuit. After the coolant enters the oil inlet circuit of the rotating shaft, it enters the first oil guide groove of the first end plate from the liquid hole of the rotating shaft, and then flows through the first oil circuit, the second oil guide groove of the second end plate, and the second oil circuit in sequence. In this process, since the second liquid hole is located between the magnetic steel groove and the outer side of the rotor punching, it can fully take away a large amount of heat generated by the surface of the rotor punching and the magnetic steel, thereby effectively reducing the temperature rise of the rotor punching and the magnetic steel, reducing the risk of magnetic steel demagnetization, and thus improving the power density of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0037] Figure 1 A schematic structural diagram of an embodiment of a rotor punching provided by the present utility model;

[0038] Figure 2 A partial structural diagram of an embodiment of a rotor core provided by the present utility model;

[0039] Figure 3 A cross-sectional view of an embodiment of a motor provided by the present utility model;

[0040] Figure 4 for Figure 3 A local enlarged view of point A' in the middle.

[0041] Description of Figure Numbers:

[0042] Label name Label name 1000 motor 31 Second oil guide groove 100 rotor 40 shaft 1 Rotor punching 41 Oil inlet 11 Magnetic steel slot 42 Liquid hole 11a The first pair of magnetic steel slots 200 chassis 11b The second pair of magnetic steel slots 300 stator 12 First liquid hole a' air gap 13 Second liquid hole 310 stator core 10 rotor core 320 stator winding 10a First oil line 330 First sealing cover 10b Second oil circuit 331 Oil baffle parts 1a Processing Group 340 Second sealing cover 20 First end plate 400 First end cap 21 First oil guide groove 500 Second end cap 30 Second end plate 510 Oil inlet channel

[0043] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0045] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0046] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0047] The drive motor system, at the heart of electric vehicles, determines the vehicle's overall power performance. When the motor runs at high speeds, the rotor temperature increases significantly, increasing the risk of magnetic demagnetization and reducing the motor's power density.

[0048] Based on the above problems, the present invention proposes a rotor punching 1, which is applied to the rotor 100, aiming to reduce the temperature rise of the rotor punching 1 and the magnetic steel, so as to reduce the risk of magnetic steel demagnetization, thereby improving the power density of the motor 1000. The rotor 100 includes a rotor core 10, a first end plate 20, a second end plate 30 and a rotating shaft 40. The rotor core 10 includes a plurality of rotor punchings 1 stacked together, the first liquid holes 12 of the plurality of rotor punchings 1 constitute a first oil circuit 10a, and the second liquid holes 13 of the plurality of rotor punchings 1 constitute a second oil circuit 10b; the first end plate 20 is covered on the first end of the rotor core 10, and a first oil guide groove 21 is provided on the side of the first end plate 20 close to the rotor core 10, and the first oil guide groove 21 is connected to the first oil circuit 10a the oil inlet end; the second end plate 30 is covered on the second end of the rotor core 10, and a second oil guide groove 31 is provided on the side of the second end plate 30 close to the rotor core 10, and the second oil guide groove 31 communicates with the oil outlet end of the first oil circuit 10a and the oil inlet end of the second oil circuit 10b; the rotating shaft 40 is sequentially passed through the first end plate 20, the rotor core 10 and the second end plate 30, and an oil inlet passage 41 is formed in the rotating shaft 40, and a liquid hole 42 is provided on the side wall of the rotating shaft 40, which communicates with the oil inlet passage 41 and the first oil guide groove 21.

[0049] See also Figures 1 to 3 In one embodiment of the present invention, the rotor punching 1 is provided with a magnetic steel groove 11, which is used to install the magnet; the rotor punching 1 is also provided with a first liquid hole 12 and a second liquid hole 13 extending along its axial direction, the first liquid hole 12 is arranged close to the inner side of the rotor punching 1, and the second liquid hole 13 is located between the magnetic steel groove 11 and the outer side of the rotor punching 1.

[0050] The technical solution of the present invention is to provide a first liquid hole 12 and a second liquid hole 13 on the rotor punching 1, wherein the first liquid hole 12 is provided near the inner side of the rotor punching 1, and the second liquid hole 13 is located between the magnetic steel slot 11 and the outer side of the rotor punching 1. When the rotor punching 1 is applied to the rotor 100, the first liquid holes 12 of the rotor punchings 1 can constitute a first oil circuit 10a, and the second liquid holes 13 of the rotor punchings 1 can constitute a second oil circuit 10b. After the coolant enters the oil inlet circuit 41 of the rotating shaft 40, it enters the first oil guide groove 21 of the first end plate 20 through the liquid hole 42 of the rotating shaft 40, and then flows through the first oil circuit 10a, the second oil guide groove 31 of the second end plate 30, and the second oil circuit 10b in sequence. During this process, since the second liquid hole 13 is arranged close to the outer side of the magnetic steel slot 11 and the rotor punching 1, it can fully take away a large amount of heat generated by the surface of the rotor punching 1 and the magnetic steel, thereby effectively reducing the temperature rise of the rotor punching 1 and the magnetic steel, reducing the risk of magnetic steel demagnetization, and thus improving the power density of the motor 1000.

[0051] In this embodiment, the number of the magnetic steel slots 11 is designed to correspond to the number of the magnetic steels. For example, when the number of the magnetic steels is twenty-four, the number of the magnetic steel slots 11 is correspondingly twenty-four.

[0052] In actual application, the shapes of the first liquid hole 12 and the second liquid hole 13 can be circular, elliptical, rectangular, triangular, etc. Moreover, the shapes and sizes of the first liquid hole 12 and the second liquid hole 13 can be the same or different, depending on the actual use.

[0053] See also Figure 1 、 Figure 2 In one embodiment of the present invention, the first liquid hole 12 and the second liquid hole 13 are elliptical holes.

[0054] With such an arrangement, the design of the elliptical hole can avoid the problem of stress concentration at the first liquid hole 12 and the second liquid hole 13 , thereby ensuring the strength of the rotor punching 1 .

[0055] In this embodiment, the major axis length of the first liquid hole 12 and / or the second liquid hole 13 is defined as a, and the minor axis length of the first liquid hole 12 and / or the second liquid hole 13 is defined as b, and then a / b>1.

[0056] In actual application, the long axes of the first liquid hole 12 and the second liquid hole 13 may be parallel to the tangential direction of the rotor punching 1 , may be parallel to the radial direction of the rotor punching 1 , or may extend in other directions.

[0057] Further, see Figure 1 、 Figure 2In one embodiment of the present invention, the long axes of the first liquid hole 12 and the second liquid hole 13 are parallel to the tangential direction of the rotor punching 1 .

[0058] In order to ensure the NVH (noise, vibration and harshness) performance of the motor 1000, the rotor core 10 usually includes a plurality of punching groups 1a, and the punching group 1a includes a plurality of rotor punchings 1, so that the two adjacent punching groups 1a are deflected by a first circumferential angle along the circumference of the rotor core 10. Therefore, by setting the first liquid hole 12 and the second liquid hole 13 as elliptical holes, and making the long axes of the first liquid hole 12 and the second liquid hole 13 parallel to the tangential direction of the rotor punching 1, the first liquid holes 12 of the two adjacent punching groups 1a can be partially connected after being deflected by the first circumferential angle along the circumference of the rotor core 10, and the second liquid holes 13 of the two adjacent punching groups 1a can be partially connected.

[0059] See also Figure 1 In one embodiment of the present invention, with the center of the rotor punching 1 as the vertex angle O, the two end points of the second liquid hole 13 on its long axis are A and B respectively, then ∠AOB>3°.

[0060] Such an arrangement can effectively ensure that the second liquid holes 13 of the two adjacent punching sheet groups 1a are partially connected after the two adjacent punching sheet groups 1a are deflected by the first circumferential angle along the circumference of the rotor core 10, that is, avoid the problem of the second liquid hole 13 having a small flow area or even being unable to pass oil after the rotor is misaligned.

[0061] As some examples, ∠AOB can be 3.2°, 3.5°, 3.6°, 3.7°, 3.9°, 4°, 4.2°, 4.3°, 4.6°, 4.8°, etc.

[0062] See also Figure 1 In one embodiment of the present invention, the shortest distance between the second liquid hole 13 and the outer wall of the rotor punching 10 is defined as c, and the shortest distance between the second liquid hole 13 and the magnetic steel slot 11 is defined as d, then: c / d>1 is satisfied.

[0063] With such an arrangement, the second liquid hole 13 can be placed as close as possible to the magnetic steel slot 11 , thereby improving the cooling effect on the magnetic steel and achieving effective temperature reduction of the magnetic steel.

[0064] See also Figure 1In one embodiment of the present invention, the magnetic steel slots 11 include a first pair of magnetic steel slots 11a and a second pair of magnetic steel slots 11b. The first pair of magnetic steel slots 11a are arranged symmetrically with respect to the axis of the rotor punching 10 along the radial direction, closer to the symmetry axis than the second pair of magnetic steel slots 11b. The symmetry axis extends along the radial direction and passes through the midpoint of the rotor punching 10. The first pair of magnetic steel slots 11a are arranged at a first mechanical angle relative to each other, and the first mechanical angle is an acute angle. The second pair of magnetic steel slots 11b are arranged at a second mechanical angle relative to each other. The first liquid hole 12 is located between the first pair of magnetic steel slots 11a and the inner side of the rotor punching 1; when the second mechanical angle is an acute angle, the second liquid hole 13 is located between the second pair of magnetic steel slots 11b and the outer side of the rotor punching 1; when the second mechanical angle is 180 degrees, the second liquid hole 13 is located between the second pair of magnetic steel slots 11b and the first pair of magnetic steel slots 11a.

[0065] In this way, by arranging the first liquid hole 12 between the first pair of magnetic steel slots 11a and the inner side of the rotor punching 1, the coolant flowing through the first liquid hole 12 can effectively take away the heat generated by the magnetic steel installed in the first pair of magnetic steel slots 11a and part of the heat of the rotor punching 1.

[0066] When the second mechanical angle is an acute angle, that is, the second pair of magnetic steel slots 11b are V-shaped slots, there is sufficient space between the second pair of magnetic steel slots 11b and the outer side of the rotor punching 1. Therefore, by arranging the second liquid hole 13 between the second pair of magnetic steel slots 11b and the outer side of the rotor punching 1, the second liquid hole 13 can be closer to the second pair of magnetic steel slots 11b and the outer side of the rotor punching 1. In this way, when the coolant flows through the second liquid hole 13, it can effectively take away the heat generated by the magnetic steel installed in the second magnetic steel slot 11b and the heat of the teeth of the rotor punching 1;

[0067] When the angle of the second machine is 180 degrees, that is, the second pair of magnetic steel slots 11b are straight slots, the gap between the second pair of magnetic steel slots 11b and the outer side of the rotor punching 1 is smaller, and there is no longer enough space to set the second liquid hole 13. Therefore, by setting the second liquid hole 13 between the second pair of magnetic steel slots 11b and the first pair of magnetic steel slots 11a, the coolant can effectively take away the heat generated by the magnets installed in the second pair of magnetic steel slots 11b, the heat generated by the magnets installed in the first pair of magnetic steel slots 11a, and the heat of the teeth of the rotor punching 1 when flowing through the second liquid hole 13.

[0068] See also Figure 1 、 Figure 2 In one embodiment of the present invention, the first liquid holes 12 and the second liquid holes 13 are spaced apart along the radial direction of the rotor punching 1 .

[0069] With such a configuration, when the rotor punching 1 is applied to the rotor 100, when the coolant flows from the first liquid hole 12 to the second oil guide groove 31 of the second end plate 30, the coolant in the second oil guide groove 31 can be better thrown to the oil inlet end of the second liquid hole 13 under the rotation of the rotor 100.

[0070] See also Figure 2 、 Figure 3 The present invention also proposes a rotor 100, which includes a rotor core 10, a first end plate 20, a second end plate 30 and a rotating shaft 40. The rotor core 10 includes a plurality of stacked rotor punchings 1. The specific structure of the rotor punchings 1 refers to the above embodiment. Since the rotor 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0071] Among them, the first liquid holes 12 of multiple rotor punchings 1 constitute the first oil circuit 10a, and the second liquid holes 13 of multiple rotor punchings 1 constitute the second oil circuit 10b; the first end plate 20 is covered on the first end of the rotor core 10, and the first end plate 20 is provided with a first oil guide groove 21 on the side close to the rotor core 10, and the first oil guide groove 21 is connected to the oil inlet end of the first oil circuit 10a; the second end plate 30 is covered on the second end of the rotor core 10, and the second end plate 30 is provided with a second oil guide groove 31 on the side close to the rotor core 10, and the second oil guide groove 31 is connected to the oil outlet end of the first oil circuit 10a and the oil inlet end of the second oil circuit 10b; the rotating shaft 40 is sequentially penetrated by the first end plate 20, the rotor core 10 and the second end plate 30, and an oil inlet circuit 41 is formed in the rotating shaft 40, and the side wall of the rotating shaft 40 is provided with a liquid hole 42, and the liquid hole 42 is connected to the oil inlet circuit 41 and the first oil guide groove 21.

[0072] It is understandable that after the coolant enters the oil inlet 41 of the rotating shaft 40, it enters the first oil guide groove 21 of the first end plate 20 through the liquid hole 42 of the rotating shaft 40, and then flows through the first oil circuit 10a, the second oil guide groove 31 of the second end plate 30, and the second oil circuit 10b in sequence. In this process, since the second liquid hole 13 is arranged close to the outer side of the magnetic steel groove 11 and the rotor punching 1, it can fully take away a large amount of heat generated by the surface of the rotor punching 1 and the magnetic steel, thereby effectively reducing the temperature rise of the rotor punching 1 and the magnetic steel, reducing the risk of magnetic steel demagnetization, and thus improving the power density of the motor 1000. For example, compared with not setting the first oil circuit 10a and the second oil circuit 10b, this solution can reduce the temperature of the teeth of the rotor punching 1 and the magnetic steel by more than 20°C.

[0073] In addition, by providing the liquid hole 42 only on one side of the rotating shaft 40 , the oil throwing of the rotor 100 can be changed from the oil throwing of the two sides to the oil throwing of the one side, thereby reducing the mechanical loss of the rotor 100 when throwing oil.

[0074] See also Figure 3 In one embodiment of the present invention, the rotor core 10 includes a plurality of punching sheet groups 1a, the punching sheet groups 1a include a plurality of rotor punching sheets 1, and the adjacent two punching sheet groups 1a are deflected by a first circumferential angle along the circumference of the rotor core 10, the first liquid holes 12 of the adjacent two punching sheet groups 1a are partially connected, and the second liquid holes 13 of the adjacent two punching sheet groups 1a are partially connected.

[0075] Such arrangement aims to ensure the NVH (noise, vibration and harshness) performance of the motor 1000 by deflecting the two adjacent punching sheet groups 1a by a first circumferential angle along the circumference of the rotor core 10. Therefore, by partially connecting the first liquid holes 12 of the two adjacent punching sheet groups 1a and partially connecting the second liquid holes 13 of the two adjacent punching sheet groups 1a, the connectivity of the first oil circuit 10a and the connectivity of the second oil circuit 10b can be ensured.

[0076] See also Figure 3 、 Figure 4 The present invention also provides a motor 1000, which includes a housing 200, a stator 300, and a rotor 100. The specific structure of the rotor 100 is similar to the above-mentioned embodiments. Since the present motor 1000 adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be described in detail here. Among them, the stator 300 is arranged in the housing 200; the rotor 100 is arranged on the inner side of the stator 300, and an air gap a' is formed between the stator 300 and the stator 300; the stator 300 is provided with an oil blocking component 331, which extends to one side of the air gap a' and is used to prevent the coolant sprayed from the second oil circuit 10b from entering the air gap a'.

[0077] It can be understood that when the coolant is sprayed out from the second oil circuit 10b, it will collide with other structures of the stator 300 and rebound. The coolant can easily rebound into the air gap a' between the stator 300 and the rotor 100. Therefore, by providing an oil baffle component 331 on the stator 300 so that the oil baffle component 331 extends to one side of the air gap a', the oil baffle component 331 can block the coolant sprayed out from the second oil circuit 10b from entering the air gap a', which can effectively reduce mechanical losses. Specifically, when the coolant enters the rotor air gap a', the rotor 100 generates mechanical losses during movement. Through the above settings, the efficiency of the motor 1000 can be improved. For example, the overall operating efficiency of the machine can be improved by more than 0.5%.

[0078] In actual application, the oil blocking component 331 may be provided on the stator core 310 of the stator 300 , or may be provided on the sealing cover of the stator 300 .

[0079] See also Figure 3 、 Figure 4In one embodiment of the present invention, the stator 300 includes a stator core 310, a stator winding 320 and a first sealing cover 330; the stator core 310 is connected to the casing 200; the stator winding 320 is wound around the stator 300 slots of the stator core 310; the first sealing cover 330 is provided at one end of the stator core 310, the first sealing cover 330 is provided close to the oil outlet end of the second oil circuit 10b, and the oil blocking component 331 is integrated into the side of the first sealing cover 330 close to the rotor 100.

[0080] In this configuration, by integrating the oil blocking component 331 on the side of the first sealing cover 330 close to the rotor 100, it is not only easier to form the oil blocking component 331, but also the oil blocking component 331 will not interfere with other structures during installation.

[0081] In this embodiment, the stator 300 may further include a second sealing cover 340, which is arranged on the other end of the stator core 310. In this way, an oil inlet chamber is formed between the first sealing cover 330 and one end of the stator core 310, and an oil outlet chamber is formed between the second sealing cover 340 and the other end of the stator core 310. The oil inlet chamber is used to accommodate one end of the stator winding 320, and the oil outlet chamber is used to accommodate the other end of the stator winding 320. After the coolant enters the oil inlet chamber, it can flow through the stator core 310 and then flow to the oil outlet chamber. In this process, the stator 300 can be effectively cooled.

[0082] In another embodiment, the stator 300 includes a stator core 310 , a stator winding 320 and an oil retaining member 331 ; the stator core 310 is connected to the housing 200 ; the stator winding 320 is wound around the stator slots of the stator core 310 ; and the oil retaining member 331 cooperates with the stator core 310 .

[0083] In this configuration, by integrating the oil blocking component 331 on the stator core 310 , the oil blocking component 331 can also block the coolant sprayed from the second oil passage 10 b from entering the air gap a′, thereby effectively reducing mechanical losses.

[0084] Optionally, the oil blocking component 331 may be an annular structure, so that the annular oil blocking component 331 can fully block the coolant sprayed from the second oil passage 10b from entering the annular air gap a′.

[0085] It should be noted that, in this solution, the oil circuit for cooling the stator 300 and the oil circuit for cooling the rotor 100 are independent of each other.

[0086] In this embodiment, the motor 1000 may further include a first end cover 400 and a second end cover 500. The first end cover 400 and the second end cover 500 are respectively covered at both ends of the casing 200, and an installation space is formed between the first end cover 400 and the second end cover 500 and the casing 200. The stator 300 and the rotor 100 are both installed in the installation space.

[0087] In one embodiment, the second end cover 500 is provided with an oil inlet passage 510, which is in communication with the oil inlet passage 41 of the rotating shaft 40. Coolant can flow from the oil inlet passage 510 to the oil inlet passage 41 to provide coolant to the oil inlet passage 41. In actual application, the oil inlet passage 510 can be a straight oil passage or a multi-section curved oil passage.

[0088] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A rotor punching, characterized in that: The rotor punching is provided with a magnetic steel slot, and the magnetic steel slot is used to install the magnetic steel; The rotor punching is further provided with a first liquid hole and a second liquid hole extending along its axial direction. The first liquid hole is arranged close to the inner side of the rotor punching, and the second liquid hole is located between the magnetic steel slot and the outer side of the rotor punching.

2. The rotor punching according to claim 1, characterized in that: The first liquid hole and the second liquid hole are elliptical holes.

3. The rotor punching according to claim 2, characterized in that: The long axes of the first liquid hole and the second liquid hole are parallel to the tangential direction of the rotor punching sheet.

4. The rotor punching according to claim 3, characterized in that: With the center of the rotor punching as the vertex angle O, and the two end points of the second liquid hole on its long axis being A and B respectively, then ∠AOB>3°.

5. The rotor punching according to any one of claims 1 to 4, characterized in that The shortest distance between the second liquid hole and the outer side wall of the rotor punching is defined as c, and the shortest distance between the second liquid hole and the magnetic steel slot is defined as d, then: c / d>1 is satisfied.

6. The rotor punching according to any one of claims 1 to 4, characterized in that The magnetic steel slots include a first pair of magnetic steel slots and a second pair of magnetic steel slots. The first pair of magnetic steel slots are arranged radially relative to the rotor sheet axis and closer to the axis of symmetry than the second pair of magnetic steel slots. The axis of symmetry extends radially and passes through a midpoint of the rotor sheet. The first pair of magnetic steel slots are arranged at a first mechanical angle relative to each other, the first mechanical angle being an acute angle. The second pair of magnetic steel slots are arranged at a second mechanical angle relative to each other. The first liquid hole is located between the first pair of magnetic steel slots and the inner side of the rotor punching; When the angle of the second mechanism is an acute angle, the second liquid hole is located between the second pair of magnetic steel slots and the outer side of the rotor punching; When the angle of the second mechanism is 180 degrees, the second liquid hole is located between the second pair of magnetic steel slots and the first pair of magnetic steel slots.

7. The rotor punching according to any one of claims 1 to 4, characterized in that The first liquid holes and the second liquid holes are distributed at intervals along the radial direction of the rotor punching sheet.

8. A rotor, characterized in that: include: A rotor core comprising a plurality of stacked rotor punchings, wherein the rotor punchings are the rotor punchings according to any one of claims 1 to 7, wherein the first fluid holes of the plurality of rotor punchings constitute a first oil path, and the second fluid holes of the plurality of rotor punchings constitute a second oil path; a first end plate, covering the first end of the rotor core, wherein a first oil guide groove is provided on a side of the first end plate close to the rotor core, and the first oil guide groove is connected to the oil inlet end of the first oil circuit; a second end plate, covering the second end of the rotor core, wherein a second oil guide groove is provided on a side of the second end plate close to the rotor core, wherein the second oil guide groove is connected to the oil outlet end of the first oil circuit and the oil inlet end of the second oil circuit; The rotating shaft is sequentially passed through the first end plate, the rotor core and the second end plate. An oil inlet is formed in the rotating shaft. A liquid hole is provided on the side wall of the rotating shaft. The liquid hole connects the oil inlet and the first oil guide groove.

9. The rotor according to claim 8, wherein: The rotor core includes a plurality of punching sheet groups, each of which includes a plurality of rotor punching sheets. Two adjacent punching sheet groups are deflected by a first circumferential angle along the circumference of the rotor core, the first liquid holes of the two adjacent punching sheet groups are partially connected, and the second liquid holes of the two adjacent punching sheet groups are partially connected.

10. A motor, characterized in that: include: chassis; a stator, disposed in the housing; The rotor according to claim 8 or 9, wherein the rotor is arranged inside the stator and an air gap is formed between the rotor and the stator; The stator is provided with an oil blocking component, which extends to one side of the air gap and is used to block the coolant sprayed from the second oil circuit from entering the air gap.

11. The motor according to claim 10, wherein The stator comprises: a stator core connected to the casing; stator windings, wound around the stator slots of the stator core; The first sealing cover is provided at one end of the stator core. The first sealing cover is provided close to the oil outlet end of the second oil circuit. The oil retaining component is integrated at a side of the first sealing cover close to the rotor.

12. The motor according to claim 10, wherein The stator comprises: a stator core connected to the casing; stator windings, wound around the stator slots of the stator core; The oil-blocking component cooperates with the stator core.

13. The motor according to any one of claims 10 to 12, characterized in that The oil-blocking component is an annular structure.

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