Rotor structure and electric motor

Abstract

The present application discloses an electric-motor rotor. The electric-motor rotor comprises: a core, a plurality of permanent magnets and filling portions, wherein a plurality of permanent magnet holes are axially provided in and penetrate the core; the plurality of permanent magnet holes are axially arranged at intervals; the plurality of permanent magnets are inserted into the corresponding permanent magnet holes, and each of the permanent magnets is provided with a slot on at least one side in the radial direction of the core; the slots run through both ends of the core in the axial direction; and the filling portions are partially located in a plurality of slots and used for connecting the core to the plurality of permanent magnets.

Description

[According to Rule 26 correction 07.01.2025] Motor rotor

[0001] Related applications

[0002] This application claims priority to Chinese Patent Application No. 202410654447.4, filed on May 24, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of rotor, in particular to a motor rotor. BACKGROUND

[0004] With the rapid development of the new energy vehicle industry, permanent magnet synchronous motors are increasingly widely used in the field of new energy vehicles. With the development of technology, the power density and rotational speed of the motor are also increasing. High-speed motors face the problems of high-speed centrifugal force and high temperature of the magnetic steel.

[0005] The temperature of the magnetic steel increases due to the eddy current loss at high speed, which causes the performance of the magnetic steel and the motor to decrease, and even irreversible demagnetization occurs. Generally, segmented magnetic steel is used to increase the resistivity of the magnetic steel and reduce the eddy current loss, thereby reducing the temperature of the magnetic steel and improving the anti-demagnetization performance of the motor.

[0006] However, the bonding force of the bonded magnetic steel is limited, which reduces the mechanical properties of the magnetic steel. SUMMARY

[0007] The main purpose of the present application is to provide a motor rotor, which aims to solve the problem of limited bonding force of bonded magnetic steel, which reduces the mechanical properties of the magnetic steel.

[0008] To achieve the above-mentioned purpose, the present application provides a motor rotor, comprising:

[0009] a core, a plurality of magnetic steel holes are provided along the axial direction, and the plurality of magnetic steel holes are arranged at intervals along the axial direction; and

[0010] a plurality of magnetic steels, each of the plurality of magnetic steels is inserted into a corresponding magnetic steel hole, and each of the magnetic steels is provided with a slot on at least one side along the radial direction of the core, and the slot is provided through at both ends along the axial direction of the core; and

[0011] a filling portion, the filling portion is partially located in the plurality of slots, and is used to connect the core and the plurality of magnetic steels.

[0012] In an embodiment, the slot comprises a first slot section and a second slot section arranged in sequence from the side of the magnetic steel to the inside, and the second slot section is partially exposed to the first slot section.

[0013] In an embodiment, a size of the magnetic steel in the circumferential direction of the iron core is L, a distance between a slot opening of the first slot segment and a side surface of the magnetic steel in the circumferential direction of the iron core is L1, and 1 / 4≤L1 / L≤1 / 3; and / or,

[0014] a size of the magnetic steel in the circumferential direction of the iron core is L, a size of the second slot segment in the circumferential direction of the iron core is L2, and 1 / 3≤L2 / L≤4 / 9; and / or,

[0015] a size of the magnetic steel in the radial direction of the iron core is H, a distance between a slot bottom of the second slot segment and the slot opening of the first slot segment is H1, and 1 / 4≤H1 / H≤1 / 3.

[0016] In an embodiment, the filling part comprises injection molding material.

[0017] In an embodiment, each of the magnetic steel and the hole wall of the corresponding magnetic steel hole is spaced apart, and part of the filling part is filled between the magnetic steel and the hole wall of the magnetic steel hole.

[0018] In an embodiment, a gap between each of the magnetic steel and the corresponding magnetic steel hole is A, and 0.1mm≤A≤0.2mm.

[0019] In an embodiment, a groove corresponding to the slot opening is recessed on the hole wall of each of the magnetic steel holes, the groove is provided through at both ends in the axial direction of the iron core, and part of the filling part is filled in the groove.

[0020] In an embodiment, the slot walls of the groove are arranged close to each other from the slot bottom to the slot opening.

[0021] In an embodiment, the motor rotor further comprises two magnetic isolation plates, the two magnetic isolation plates are arranged at both ends in the axial direction of the iron core, each of the magnetic isolation plates is provided with a plurality of hole portions arranged at intervals, and the plurality of hole portions correspond to the plurality of magnetic steel holes, respectively;

[0022] Part of the filling part extends into the hole portion from one end of the two magnetic isolation plates away from the iron core and extends into the magnetic steel hole.

[0023] In an embodiment, the iron core comprises a plurality of rotor laminations stacked in the axial direction, each of the rotor laminations is provided with a plurality of hole segments arranged at intervals in the circumferential direction, and adjacent two of the hole segments in the axial direction are partially staggered, a plurality of the hole segments corresponding to each other in the axial direction are communicated with each other to form the magnetic steel hole.

[0024] The magnetic steel hole comprises a plurality of magnetic steel segments of each of the magnetic steel stacked in the axial direction of the iron core, and each of the magnetic steel segments is inserted into the corresponding hole segment.

[0025] The technical scheme of the application is characterized in that the slot is arranged on at least one side of each magnetic steel along the radial direction of the iron core, and the slot is arranged through the two ends along the axial direction of the iron core, so that the plurality of slots can improve the resistivity of the corresponding magnetic steel, reduce the eddy current loss of the plurality of magnetic steels, thereby reducing the heat generation of the plurality of magnetic steels, reducing the temperature of the plurality of magnetic steels, so as to ensure the mechanical performance of the magnetic steels while reducing the performance decline of the plurality of magnetic steels due to temperature rise, and the filling part serves to connect the iron core and the plurality of magnetic steels, so that the iron core and the plurality of magnetic steels are integrated, thereby playing a pulling role on the pole shoe of the iron core through the filling part during high-speed operation of the motor rotor, so as to resist the centrifugal force brought by high-speed operation of the motor rotor, and achieve the purpose of improving the working efficiency of the motor rotor. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0027] Fig. 1 is a structural schematic view of an embodiment of the motor rotor provided by the present application;

[0028] Fig. 2 is an axial schematic view of the iron core and the magnetic steel in Fig. 1;

[0029] Fig. 3 is an axial schematic view of the magnetic steel hole and the magnetic steel in Fig. 1;

[0030] Fig. 4 is an axial schematic view of the magnetic steel hole and the magnetic steel in Fig. 1;

[0031] Fig. 5 is a cross-sectional schematic view of the hole part in Fig. 4;

[0032] Fig. 6 is a structural schematic view of the filling part in Fig. 1.

[0033] Explanation of reference numerals:

[0034] 100, motor rotor; 1, iron core; 11, magnetic steel hole; 12, groove; 13, rotor lamination; 131, hole section; 2, magnetic steel; 21, slot; 211, first slot section; 212, second slot section; 222, magnetic steel section; 3, filling part; 4, magnetic steel; 41, hole part.

[0035] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. Embodiment of the present application

[0036] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of the present application.

[0037] It should be noted that if the embodiments of the present application 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 condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0038] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel solutions are included, for example, "A and / or B" includes A solution, or B solution, or A and B solution. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present application.

[0039] The present application provides a motor rotor, which aims to solve the problem of limited bonding force of bonded magnetic steel, which leads to the decline of mechanical properties of the magnetic steel.

[0040] Please refer to FIG. 1 to FIG. 6, in an embodiment of the present application, the motor rotor 100 includes a core 1, a plurality of magnetic steels 2 and a filling part 3, the core 1 is provided with a plurality of magnetic steel holes 11 along the axial direction, a plurality of the magnetic steel holes 11 are arranged at intervals along the axial direction, a plurality of the magnetic steels 2 are respectively inserted into the corresponding magnetic steel holes 11, and each of the magnetic steels 2 is provided with a slot 21 on at least one side along the radial direction of the core 1, the slot 21 is provided through along both ends in the axial direction of the core 1, and the filling part 3 is partially located in a plurality of the slots 21 and used to connect the core 1 and a plurality of the magnetic steels 2.

[0041] The technical scheme of the present application is characterized in that the slot 21 is arranged on at least one side of each magnetic steel 2 along the radial direction of the iron core 1, and the slot 21 is arranged through both ends along the axial direction of the iron core 1. In this way, the plurality of slots 21 can improve the resistivity of the corresponding magnetic steel 2, reduce the eddy current loss of the plurality of magnetic steels 2, thereby reducing the heat generation of the plurality of magnetic steels 2, reducing the temperature of the plurality of magnetic steels 2, and ensuring the mechanical performance of the magnetic steel while reducing the performance decline of the plurality of magnetic steels 2 due to temperature rise. In addition, the filling part 3 serves to connect the iron core 1 and the plurality of magnetic steels 2, so that the iron core 1 and the plurality of magnetic steels 2 are integrated, thereby playing a pulling role on the pole shoe of the iron core 1 through the filling part 3 during high-speed operation of the motor rotor 100, to resist the centrifugal force caused by high-speed operation of the motor rotor 100, and to improve the working efficiency of the motor rotor 100.

[0042] The present application does not limit the number of sides of each magnetic steel 2 along the radial direction of the iron core 1 on which the slot 21 is arranged. For example, in an embodiment of the present application, the slot 21 is arranged on both sides of each magnetic steel 2 along the radial direction of the iron core 1. The plurality of slots 21 arranged on both sides of each magnetic steel 2 along the radial direction of the iron core 1 can collectively improve the resistivity of the corresponding magnetic steel 2, reduce the eddy current loss of the plurality of magnetic steels 2, thereby reducing the heat generation of the plurality of magnetic steels 2, reducing the temperature of the plurality of magnetic steels 2, and achieving the purpose of reducing the performance decline of the plurality of magnetic steels 2 due to temperature rise and improving the working efficiency of the motor rotor 100.

[0043] In another embodiment of the present application, the slot 21 is arranged on one side of each magnetic steel 2 close to the axis of the iron core 1, or the slot 21 is arranged on one side of each magnetic steel 2 away from the axis of the iron core 1. In this way, no matter which side of the magnetic steel 2 along the radial direction of the iron core 1 the slot 21 is arranged on, the plurality of slots 21 still have the effect of improving the resistivity of the corresponding magnetic steel 2, thereby reducing the eddy current consumption of the corresponding magnetic steel 2.

[0044] When each magnetic steel 2 has the slot 21 arranged on only one side along the radial direction of the iron core 1, the present application also does not limit the specific side on which the slot 21 is arranged. In another embodiment of the present application, part of the magnetic steels 2 have the slot 21 arranged on one side close to the axis of the iron core 1, and the remaining magnetic steels 2 have the slot 21 arranged on one side away from the axis of the iron core 1.

[0045] In other embodiments of the present application, the number of the side surfaces of the plurality of magnetic steels 2 provided with the slots 21 can also be different. For example, some of the magnetic steels 2 are provided with the slots 21 on one side surface in the radial direction of the iron core 1, and the remaining magnetic steels 2 are provided with the slots 21 on two side surfaces in the radial direction of the iron core 1. In actual arrangement, the number can be selected according to requirements, and the present application does not make any limitation in this regard.

[0046] In addition, the present application also does not limit the number of the slots 21 provided on the side surface of each magnetic steel 2 in the radial direction of the iron core 1. In an embodiment of the present application, each magnetic steel 2 is provided with one slot 21 on the side surface in the radial direction of the iron core 1. The provision of the slot 21 can improve the resistivity efficiency of the corresponding magnetic steel 2, thereby reducing the eddy current consumption of the corresponding magnetic steel 2, and at the same time, the mechanical properties of the magnetic steel 2 can also be ensured.

[0047] In another embodiment of the present application, each magnetic steel 2 is provided with a plurality of slots 21 on the side surface in the radial direction of the iron core 1. The plurality of slots 21 are arranged at intervals in the circumferential direction of the iron core 1. In this way, the plurality of slots 21 can further improve the resistivity efficiency of the corresponding magnetic steel 2 under the premise of ensuring the mechanical properties of the corresponding magnetic steel 2, reduce the eddy current loss of the magnetic steel 2 under high-speed working conditions, and further reduce the heating of the magnetic steel 2 and the performance degradation of the magnetic steel 2 due to temperature rise.

[0048] In yet another embodiment of the present application, the number of the slots 21 provided on the side surface of each magnetic steel 2 in the radial direction of the iron core 1 can also be different. For example, some of the magnetic steels 2 are provided with one slot 21 on the side surface in the radial direction of the iron core 1, and the remaining magnetic steels 2 are provided with a plurality of slots 21 on the side surface in the radial direction of the iron core 1. The present application does not make any limitation in this regard, and the number can be selected according to requirements in actual arrangement.

[0049] When each magnetic steel 2 is provided with a plurality of slots 21 on the side surface in the radial direction of the iron core 1, the present application also does not limit the specific interval between the two adjacent slots 21, and the interval can be selected according to requirements in actual arrangement.

[0050] In the present embodiment, each magnetic steel 2 is provided with two slots 21 on two side surfaces in the radial direction of the iron core 1, and the two slots 21 are arranged at intervals in the circumferential direction of the iron core 1.

[0051] In addition, in an embodiment of the present application, the filling part 3 is specifically a solidified injection molding material. Specifically, when the filling part 3 is in a molten state, it is injected into the motor rotor 100 by injection molding to connect the iron core 1 and the plurality of magnetic steels 2, and part of it is located in the plurality of slots 21.

[0052] When the filling part 3 is partially located in the plurality of grooves 21, the grooves 21 can increase the contact area between the filling part 3 and the plurality of magnetic steels 2, thereby improving the holding force of the filling part 3 on the plurality of magnetic steels 2, and further increasing the connection strength between the iron core 1 and the plurality of magnetic steels 2, so as to improve the mechanical performance of the motor rotor 100.

[0053] Further, the present application does not limit the specific shape of each groove 21. For example, in an embodiment of the present application, each groove 21 comprises a strip-shaped groove, the size of the groove bottom of the strip-shaped groove is the same as the size of the groove opening of the strip-shaped groove. In this way, the strip-shaped groove also has the effect of improving the resistivity of the corresponding magnetic steel 2. Alternatively, in another embodiment of the present application, the groove 21 comprises a first groove segment 211 and a second groove segment 212 sequentially arranged from the side surface of the magnetic steel 2 towards the inside, and the second groove segment 212 is partially exposed to the first groove segment 211. The size of the groove opening of the first groove segment 211 is smaller than the size of the groove bottom of the second groove segment 212. In this way, the effect of improving the resistivity of the magnetic steel 2 can also be ensured. In actual arrangement, it can be selected according to requirements.

[0054] In addition, the groove 21 is arranged to comprise a first groove segment 211 and a second groove segment 212 sequentially arranged from the side surface of the magnetic steel 2 towards the inside, and the size of the groove bottom of the second groove segment 212 is greater than the size of the groove opening of the first groove segment 211. In this way, when the filling part 3 is filled into the first groove segment 211 and the second groove segment 212, since the size of the groove bottom of the second groove segment 212 is greater than the size of the groove opening of the first groove segment 211, the second groove segment 212 can further increase the contact area between the filling part 3 and the corresponding magnetic steel 2, thereby enhancing the holding force of the filling part 3 on the magnetic steel 2 and strengthening the connection strength between the iron core 1 and the magnetic steel 2.

[0055] The present application does not limit the specific form of the first groove segment 211 and the second groove segment 212. For example, in an embodiment of the present application, the first groove segment 211 is arranged as a strip-shaped groove, the second groove segment 212 is arranged as a spherical groove, and the diameter of the spherical groove is greater than the width of the strip-shaped groove. In this way, the second groove segment 212 is only partially exposed to the first groove segment 211, that is, the size of the groove bottom of the second groove segment 212 is greater than the size of the groove opening of the first groove segment 211. In this way, the contact area between the filling part 3 and the magnetic steel 2 can be increased, and the connection strength between the iron core 1 and the magnetic steel 2 can be strengthened.

[0056] In another embodiment of the present application, the first slot section 211 and the second slot section 212 are both provided as the strip-shaped slot, the first slot section 211 is arranged along the radial direction of the iron core 1, and the second slot section 212 is arranged along the circumferential direction of the iron core 1. In this way, the second slot section 212 is also only partially exposed to the first slot section 211, that is, the size of the slot bottom of the second slot section 212 is greater than the size of the slot opening of the first slot section 211. In this way, the first slot section 211 and the second slot section 212 cooperate with each other, which can also increase the contact area between the filling part 3 and the magnetic steel 2, thereby enhancing the connection strength between the iron core 1 and the magnetic steel 2.

[0057] When the first slot section 211 and the second slot section 212 are both provided as the strip-shaped slot, and the first slot section 211 is arranged along the radial direction of the iron core 1 and the second slot section 212 is arranged along the circumferential direction of the iron core 1, the present application does not limit the specific connection position of the first slot section 211 and the second slot section 212. In an embodiment, the end of one side of the first slot section 211 and the second slot section 212 is connected, so that the first slot section 211 and the second slot section 212 jointly form an “L”-shaped slot. In another embodiment, the middle of one side of the first slot section 211 and the second slot section 212 is connected, so that the first slot section 211 and the second slot section 212 jointly form a “T”-shaped slot.

[0058] In the present embodiment, the first slot section 211 and the second slot section 212 jointly form the “T”-shaped slot.

[0059] In order to further improve the stability and structural strength of the magnetic steel 2, in an embodiment of the present application, the size of the magnetic steel 2 along the circumferential direction of the iron core 1 is L, the distance between the slot opening of the first slot section 211 and one side surface of the magnetic steel 2 along the circumferential direction of the iron core 1 is L1, and 1 / 4≤L1 / L≤1 / 3. In this way, the opening position of the first slot section 211 and the second slot section 212 can be limited, so as to avoid the first slot section 211 and the second slot section 212 being arranged at the middle of the magnetic steel 2, thereby affecting the structural strength of the magnetic steel 2.

[0060] Since in the present embodiment, each of the magnetic steels 2 is provided with two slot openings 21 on both sides along the radial direction of the iron core 1, and the two slot openings 21 are arranged along the circumferential direction of the iron core 1, L1 is specifically the distance between the slot opening of each of the first slot sections 211 and the corresponding one side surface of the magnetic steel 2 along the circumferential direction of the iron core 1.

[0061] And, when two said slots 21 are arranged on both sides of said magnetic steel 2 along the radial direction of said iron core 1, and two said slots 21 are arranged at intervals along the circumferential direction of said iron core 1, because 1 / 4≤L1 / L≤1 / 3, both said slots 21 are arranged close to the corresponding side of said magnetic steel 2 along the circumferential direction of said iron core 1, so that the connection point of said iron core 1 and said magnetic steel 2 is closer to both ends of said magnetic steel 2 along the circumferential direction of said iron core 1, thereby further improving the connection strength of said iron core 1 and said magnetic steel 2.

[0062] Further, in another embodiment of the present application, the size of said magnetic steel 2 along the circumferential direction of said iron core 1 is L, and the size of said second slot section 212 along the circumferential direction of said iron core 1 is L2, 1 / 3≤L2 / L≤4 / 9. By limiting the ratio of the size of said magnetic steel 2 along the circumferential direction of said iron core 1 and the size of said second slot section 212 along the circumferential direction of said iron core 1, the size of said second slot section 212 along the circumferential direction of said iron core 1 is prevented from being too large, thereby affecting the structural strength of said magnetic steel 2, and the size of said second slot section 212 along the circumferential direction of said iron core 1 is also prevented from being too small, thereby affecting the contact area between said filling part 3 and said magnetic steel 2, and further affecting the connection strength between said iron core 1 and said magnetic steel 2.

[0063] The two said slots 21 arranged on the same side of the same magnetic steel 2 are always arranged at intervals.

[0064] In addition, in still another embodiment of the present application, the size of said magnetic steel 2 along the radial direction of said iron core 1 is H, the distance between the bottom of said second slot section 212 and the slot opening of said first slot section 211 is H1, and 1 / 4≤H1 / H≤1 / 3. By limiting the ratio of the size of said magnetic steel 2 along the radial direction of said iron core 1 and the distance between the bottom of said second slot section 212 and the slot opening of said first slot section 211, the maximum ratio and the minimum ratio between the two are determined, so that the ratio of the size of said magnetic steel 2 along the radial direction of said iron core 1 and the distance between the bottom of said second slot section 212 and the slot opening of said first slot section 211 is prevented from being too large, thereby preventing said first slot section 211 and said second slot section 212 from being too deep, affecting the structural strength of said magnetic steel 2; and the ratio of the size of said magnetic steel 2 along the radial direction of said iron core 1 and the distance between the bottom of said second slot section 212 and the slot opening of said first slot section 211 is also prevented from being too small, thereby preventing said first slot section 211 and said second slot section 212 from being too shallow, reducing the slot wall area of said first slot section 211 and said second slot section 212, thereby reducing the contact area between said filling part 3 and said magnetic steel 2, and further affecting the connection strength between said iron core 1 and said magnetic steel 2.

[0065] In order to ensure the connection strength between the iron core 1 and the magnetic steel 2, it is necessary to not only increase the contact area between the filling part 3 and the magnetic steel 2, but also further increase the contact area between the filling part 3 and the iron core 1, so as to increase the connection strength between the filling part 3 and the iron core 1, so as to achieve the purpose of enhancing the connection strength between the iron core 1 and the magnetic steel 2.

[0066] Therefore, in an embodiment of the present application, each magnetic steel 2 and the corresponding hole wall of the magnetic steel hole 11 are spaced apart, and part of the filling part 3 is filled between the magnetic steel 2 and the hole wall of the magnetic steel hole 11. In this way, by filling the gap between the magnetic steel 2 and the corresponding hole wall of the magnetic steel hole 11 with the filling part 3, the magnetic steel 2 is fixed in the corresponding magnetic steel hole 11 by the filling part 3, so as to simultaneously increase the contact area of the filling part 3 and the iron core 1, the magnetic steel 2, and further fix the magnetic steel 2 and the iron core 1 as a whole, so as to achieve the purpose of improving the connection strength between the iron core 1 and the magnetic steel 2.

[0067] However, from the above, it can be seen that the specific filling method of the filling part 3 is to inject the filling part 3 in a molten state into the motor rotor 100 by injection molding, so as to connect the iron core 1 and the plurality of magnetic steels 2. Therefore, during the filling process of the filling part 3 in a molten state, it is also necessary to ensure the flowability of the filling part 3 in a molten state, so that the filling part 3 can fill the gap between the iron core 1 and the magnetic steel 2 and the slot 21.

[0068] In order to achieve the above purpose, in an embodiment of the present application, the gap between each magnetic steel 2 and the corresponding magnetic steel hole 11 is A, and 0.1mm≤A≤0.2mm. In this way, by limiting the minimum value of the gap between each magnetic steel 2 and the corresponding magnetic steel hole 11, the flowability of the filling part 3 in a molten state during the filling process is ensured, so that the filling part 3 and the magnetic steel 2, the iron core 1 are in sufficient contact, and the connection strength between the iron core 1 and the magnetic steel 2 is ensured; at the same time, by limiting the maximum value of the gap between each magnetic steel 2 and the corresponding hole wall of the magnetic steel hole 11, the thickness of the filling part 3 is ensured, so as to prevent the thickness of the filling part 3 from being too thick and affecting the stability of the magnetic steel 2.

[0069] In addition, since the filling part 3 also fills in the plurality of grooves 21, in another embodiment of the present application, the width of each groove 12 along the circumferential direction of the core 1 is B, and 0.2mm≤B≤0.3mm. Similarly, such a setting limits the minimum value of the width of each groove 21 along the circumferential direction of the core 1, thereby ensuring the flowability of the filling part 3 in the molten state during the filling process, and further enabling the filling part 3 and the magnetic steel 2 to be in sufficient contact, thereby ensuring the holding force between the filling part 3 and the magnetic steel 2; at the same time, by limiting the maximum value of the width of each groove 12 along the axial direction of the core 1, the maximum size of the groove 21 is ensured, preventing the structure strength of the magnetic steel 2 from being affected due to the groove 21 being too large, and ensuring that the structure strength of the magnetic steel 2 is not affected.

[0070] Further, a groove 12 corresponding to the notch of the groove 21 is recessed on the hole wall of each magnetic steel hole 11, and the two ends of the groove 12 along the axial direction of the core 1 are throughly arranged, and part of the filling part 3 is filled in the groove 12. Since each groove 12 is arranged corresponding to the notch of the groove 21, and the filling part 3 is filled in each groove 12, the arrangement of the groove 12 not only increases the contact area between the filling part 3 and the core 1, but also provides a fulcrum for the filling part 3 to hold the magnetic steel 2, thereby further fixing the magnetic steel 2 and the core 1, enhancing the pulling force on the magnetic steel 2 and the rotor machine pole shoe, and at the same time, the plurality of grooves 12 can also modify the sinusoidal nature of the motor air gap magnetic density waveform, reduce harmonics, and further improve the NVH performance of the motor.

[0071] In order to prevent the connection between the filling part 3 and the groove wall 12 from failing during high-speed operation, in an embodiment of the present application, the groove wall 12 is arranged to be closer to each other from the groove bottom to the notch. In this way, when the motor rotor 100 is running at high speed, the notch of the groove 12 will form an undercut to limit the cooperation between the part of the filling part 3 in the groove 12 and the groove wall 12, thereby causing the connection between the filling part 3 and the core 1 to be unstable, and affecting the connection strength between the core 1 and the magnetic steel 2.

[0072] The application does not limit the specific structure of the groove 12. In an embodiment of the application, the groove 12 is a trapezoidal groove, and the long side of the trapezoid is the groove bottom of the trapezoidal groove, and the short side is the groove opening of the trapezoidal groove. In this way, the groove walls of the groove 12 are arranged close to each other from the groove bottom to the groove opening. When the motor rotor 100 rotates at high speed, the trapezoidal groove can form an undercut to ensure the connection stability of the filling part 3 and the groove walls of the trapezoidal groove, thereby realizing the stable connection between the iron core 1 and the magnetic steel 2 and ensuring the connection strength, and enhancing the pulling force of the filling part 3 on the magnetic steel 2 and the rotor pole shoe.

[0073] In another embodiment of the application, the groove 12 can also be a semispherical groove, and the cross section of the semispherical groove in the radial direction of the iron core 1 is greater than 1 / 2 of a semispherical shape. In this way, the groove bottom size of the groove 12 is greater than the groove opening size of the groove 12, so that when the motor rotor 100 rotates at high speed, the semispherical groove can form an undercut to ensure the connection strength between the iron core 1 and the magnetic steel 2, and enhance the pulling force of the filling part 3 on the magnetic steel 2 and the rotor pole shoe.

[0074] Of course, in other embodiments of the application, the groove 12 can also be triangular, greater than 1 / 2 rhombic or other forms. In actual setting, it can be selected according to needs, and the application does not limit this.

[0075] When the groove 12 is set to a trapezoidal, triangular or other shape with edges, the edges of each shape need to be chamfered to ensure that the filling part 3 can fully fill the groove 12, so as to ensure the contact area of the filling part 3 and the groove 12, and further ensure the connection strength with the iron core 1, and improve the connection strength between the iron core 1 and the magnetic steel 2.

[0076] Furthermore, in order to further improve the structural stability of the motor rotor 100, in the present application, the motor rotor 100 is also provided with two magnetic isolation plates 4, which are arranged at the two ends of the iron core 1 in the axial direction, each of the magnetic isolation plates 4 is provided with a plurality of spaced-apart hole portions 41, each of the hole portions 41 corresponds to a plurality of magnetic steel holes 11, and part of the filling portion 3 extends into the hole portion 41 from one end of the two magnetic isolation plates 4 away from the iron core 1 and extends into the magnetic steel hole 11. In this way, the two magnetic isolation plates 4 can jointly clamp the iron core 1, and when part of the filling portion 3 extends into the corresponding magnetic steel hole 11 from the one end of the two magnetic isolation plates 4 away from the iron core 1 through the plurality of hole portions 41, the filling portion 3 can fix the relative position of the iron core 1 and the magnetic isolation plate 4, thereby improving the rigidity of the motor rotor 100, thereby resisting the torsion and bending deformation of the motor rotor 100 during high-speed rotation, and improving the modal of the rotor and the NVH performance of the motor.

[0077] The arrangement of a plurality of hole portions 41 can also improve the flowability of the filling portion 3 in the molten state during the filling process, thereby ensuring the quality of the motor rotor 100 and improving the manufacturing process of the motor rotor 100.

[0078] The present application does not limit the number of hole portions 41 corresponding to each magnetic steel hole 11, in an embodiment of the present application, each hole portion 41 on each magnetic isolation plate 4 corresponds to one magnetic steel hole 11, in this way, it can be ensured that the filling portion 3 can extend into each magnetic steel hole 11 through the hole portions 41 on the two magnetic isolation plates 4, ensuring the connection strength between the iron core 1 and the two magnetic isolation plates 4, while realizing the clamping of the iron core 1 by the two magnetic isolation plates 4.

[0079] In another embodiment of the present application, every two hole portions 41 on each magnetic isolation plate 4 correspond to one magnetic steel hole 11, in this way, not only can the filling portion 3 extend into each magnetic steel hole 11, but also can further improve the connection stability and balance between the iron core 1 and the two magnetic isolation plates 4.

[0080] In order to further improve the connection strength between the iron core 1 and the two magnetic isolation plates 4 and the clamping force of the two magnetic isolation plates 4 on the iron core 1, in the present application, the hole diameter of the hole portion 41 away from the iron core 1 is smaller than the hole diameter close to the iron core 1. In this way, the hole close to the iron core 1 can limit the movement of the filling portion 3, and the two ends of the filling portion 3 along the circumferential direction of the iron core 1 can respectively apply pressure to the two magnetic isolation plates 4 towards the iron core 1, so that the two magnetic isolation plates 4 press the iron core 1 tightly, thereby improving the connection strength between the iron core 1 and the two magnetic isolation plates 4.

[0081] Specifically, in an embodiment of the present application, the hole diameter of the hole portion 41 is tapered in the direction close to the core 1. That is, in this embodiment, the hole portion 41 is provided as a tapered hole, which is configured such that the hole diameter of the end close to the core 1 is smaller than the hole diameter of the end away from the core 1. The hole diameter of the end close to the core 1 can limit the movement of the filling portion 3, so that the two ends of the filling portion 3 in the circumferential direction of the core 1 can respectively apply pressure to the two magnetic-shielding plates 4 in the direction of the core 1, so that the two magnetic-shielding plates 4 press the core 1, thereby improving the connection strength between the core 1 and the two magnetic-shielding plates 4.

[0082] In another embodiment of the present application, the hole portion 41 is provided as a counterbore, which is configured such that the hole diameter of the end close to the core 1 is also smaller than the hole diameter of the end away from the core 1. In the same way, the two magnetic-shielding plates 4 can press the core 1, thereby improving the connection strength between the core 1 and the two magnetic-shielding plates 4.

[0083] In addition, in order to improve the overall stiffness of the motor rotor 100, the core 1 includes a plurality of rotor laminations 13 stacked in the axial direction, each of the rotor laminations 13 is provided with a plurality of hole segments 131 spaced apart in the circumferential direction, and the two hole segments 131 adjacent in the axial direction are partially staggered, and the corresponding plurality of hole segments 131 in the axial direction are in communication with each other to form the magnetic steel hole 11; the magnetic steel hole 11 includes a plurality of magnetic steel segments 222 of each magnetic steel 2 stacked in the axial direction of the core 1, and each magnetic steel segment 222 is inserted into the corresponding hole segment 131. In this way, the projections of the two adjacent hole segments 131 corresponding to the axial direction of the core 1 are only partially overlapped, and the projections of the two adjacent magnetic steel segments 222 corresponding to the circumferential direction of the core 1 are also only partially overlapped. In this way, the overall strength of the motor rotor 100 can be further improved, thereby improving the ability of the motor rotor 100 to resist bending and torsional deformation, and improving the NVH performance of the motor.

[0084] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made by using the contents of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. An electric machine rotor, wherein, The motor rotor comprises: a core, a plurality of magnetic steel holes are axially arranged in the core, and the plurality of magnetic steel holes are axially spaced apart; a plurality of magnetic steels, the plurality of magnetic steels are respectively inserted into corresponding magnetic steel holes, and each magnetic steel is provided with a slot on at least one side of the radial direction of the core, and the slot is provided through at both ends of the axial direction of the core; and a filling part, the filling part is partially located in the plurality of slots, and is used to connect the core and the plurality of magnetic steels.

2. The motor rotor of claim 1, wherein, The slot comprises a first slot section and a second slot section arranged in sequence from the side of the magnetic steel to the inside, and the second slot section is partially exposed to the first slot section.

3. The motor rotor of claim 2, wherein, The size of the magnetic steel in the circumferential direction of the core is L, the distance between the slot opening of the first slot section and one side surface of the magnetic steel in the circumferential direction of the core is L1, and 1 / 4≤L1 / L≤1 / 3; and / or, The size of the magnetic steel in the circumferential direction of the core is L, the size of the second slot section in the circumferential direction of the core is L2, and 1 / 3≤L2 / L≤4 / 9, and / or, The size of the magnetic steel in the radial direction of the core is H, the distance between the slot bottom of the second slot section and the slot opening of the first slot section is H1, and 1 / 4≤H1 / H≤1 / 3.

4. The motor rotor of claim 1, wherein, The filling part comprises injection molding material.

5. The motor rotor of claim 1, wherein, Each magnetic steel and the hole wall of the corresponding magnetic steel hole are spaced apart, and part of the filling part is filled between the magnetic steel and the hole wall of the magnetic steel hole.

6. The motor rotor of claim 5, wherein, The gap between each magnetic steel and the corresponding magnetic steel hole is A, and 0.1mm≤A≤0.2mm.

7. The motor rotor of claim 1, wherein, A groove is concavely arranged on the hole wall of each magnetic steel hole corresponding to the slot opening, the groove is provided through at both ends of the axial direction of the core, and part of the filling part is filled in the groove.

8. The motor rotor of claim 7, wherein, The groove walls are arranged close to each other from the groove bottom to the slot opening.

9. The motor rotor of claim 1, wherein, The motor rotor further comprises two magnetic separation plates, the two magnetic separation plates are arranged at both ends of the axial direction of the core, each magnetic separation plate is provided with a plurality of spaced apart hole parts, and the plurality of hole parts correspond to the plurality of magnetic steel holes respectively; Part of the filling part extends into the hole part from one end of the two magnetic separation plates away from the core and into the magnetic steel hole.

10. The motor rotor of claim 1, wherein, The core comprises a plurality of rotor laminations stacked in the axial direction, each rotor lamination is provided with a plurality of hole sections spaced apart in the circumferential direction in the circumferential direction, and two adjacent hole sections in the axial direction are partially staggered, a plurality of hole sections corresponding in the axial direction are communicated with each other to form the magnetic steel hole; The magnetic steel hole comprises a plurality of magnetic steel sections stacked in the axial direction of the core, and each magnetic steel section is inserted into the corresponding hole section.

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