Rotor core, rotor assembly, motor and industrial robot

Abstract

The utility model discloses a rotor core, a rotor assembly, a motor and an industrial robot, and belongs to the technical field of motors, the rotor core comprises a plurality of rotor punching sheets, the plurality of rotor punching sheets are laminated and form a shaft hole, the rotor punching sheets are provided with a plurality of mounting grooves used for mounting magnets, the plurality of mounting grooves are distributed at intervals along the circumferential direction of the rotor punching sheets, and the mounting grooves are used for mounting the magnets. The inner circumferential wall of the rotor punching sheet is provided with a plurality of grooves, and the plurality of grooves are distributed at intervals along the circumferential direction of the rotor punching sheet. Along the axial direction of the rotor core, the adjacent rotor punching sheets are arranged in a staggered manner around the axis of the rotor core, so that the plurality of rotor punching sheets are superposed. According to the utility model, the surface thickness difference between the rotor punching sheets is uniformly dispersed, the error accumulation caused by the surface thickness difference of the rotor punching sheets is reduced, the flatness of the rotor core is improved, the possibility of axial deviation of the shaft hole of the rotor core is reduced, the accurate alignment between the rotating shaft and the shaft hole is ensured, and the production efficiency is improved. And the possibility of deformation of the rotor iron core is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a rotor core, a rotor assembly, a motor and an industrial robot. Background Art

[0002] In the related art, the rotor core of the motor is usually made of multiple rotor punchings stacked together. However, due to the influence of processing accuracy, the surface of the rotor punchings is often uneven. When the rotor punchings are stacked, it is difficult for the uneven rotor punchings to fit tightly together, causing the rotor core to be skewed, and then the shaft hole of the rotor core to be axially offset. When the rotating shaft is matched with the shaft hole with axial offset, it is easy to cause the rotor core to deform and warp. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a rotor core that can reduce the error accumulation caused by the thickness difference of the rotor punching surface, thereby improving the flatness of the rotor core and reducing the possibility of deformation of the rotor core.

[0004] The utility model also provides a rotor assembly, a motor and an industrial robot comprising the rotor core.

[0005] According to the rotor core of the first aspect of the utility model, the rotor core includes: a plurality of rotor punchings, which are stacked and form an axial hole, the rotor punchings are provided with a plurality of mounting grooves for mounting magnets, the plurality of mounting grooves are distributed at intervals along the circumference of the rotor punchings, the inner circumferential wall of the rotor punchings is provided with a plurality of grooves, the plurality of grooves are distributed at intervals along the circumference of the rotor punchings; along the axial direction of the rotor core, adjacent rotor punchings are staggered around the axis of the rotor core so that the plurality of rotor punchings overlap.

[0006] The rotor core according to the embodiment of the utility model has at least the following beneficial effects:

[0007] The rotor core of the utility model embodiment is provided with a plurality of installation grooves on the rotor punching sheet, and a plurality of magnets are respectively provided in the plurality of installation grooves, so that the magnets are evenly distributed on the rotor punching sheet; adjacent rotor punching sheets are staggered around the axis of the rotor core so that a plurality of rotor punching sheets overlap, so that the surface thickness difference between each rotor punching sheet can be evenly dispersed, thereby reducing the error accumulation caused by the thickness difference on the surface of the rotor punching sheet, improving the flatness of the rotor core, and further reducing the possibility of axial displacement of the shaft hole of the rotor core, ensuring that the rotating shaft and the shaft hole can be accurately aligned, and improving the matching accuracy between the rotating shaft and the shaft hole; and a plurality of grooves are provided on the inner circumferential wall of the rotor punching sheet, and the plurality of grooves are distributed at intervals along the circumference of the rotor punching sheet, and the provision of the grooves can reduce the expansion stress generated by the interference fit between the rotating shaft and the shaft hole, thereby reducing the possibility of deformation of the rotor core.

[0008] According to some embodiments of the present invention, the rotor punching is provided with a plurality of first rivet points, the plurality of first rivet points are evenly distributed along the circumference of the rotor punching, and the plurality of first rivet points of adjacent rotor punchings are buckled one-to-one.

[0009] According to some embodiments of the present invention, the number of the first rivet points is N and is half the number of the mounting slots, and the angle at which adjacent rotor punchings are staggered around the axis of the rotor core is 360° / N.

[0010] According to some embodiments of the present invention, the rotor punching is also provided with a plurality of second rivet points, which are evenly distributed along the circumference of the rotor punching, and the second rivet points are arranged closer to the outer peripheral wall of the rotor punching relative to the first rivet points, and the plurality of second rivet points of adjacent rotor punchings are buckled one by one.

[0011] According to some embodiments of the present invention, the number of the first rivet points is half of the number of the mounting slots, the number of the second rivet points is the same as the number of the mounting slots, and the second rivet points and the mounting slots are spaced apart radially along the rotor punching sheet.

[0012] According to some embodiments of the utility model, the rotor punching is also provided with a plurality of heat dissipation holes, and the plurality of heat dissipation holes are distributed at intervals along the circumference of the rotor punching, the number of the heat dissipation holes is the same as the number of the mounting slots, and the heat dissipation holes and the mounting slots are arranged at radial intervals along the rotor punching.

[0013] According to some embodiments of the present invention, the heat dissipation holes and the first rivet points are arranged closer to the axial hole than the second rivet points, and the plurality of heat dissipation holes are divided into a plurality of groups along the circumference of the rotor core, and the plurality of groups of heat dissipation holes are staggered with the plurality of the first rivet points.

[0014] According to some embodiments of the utility model, the installation groove is located on the outer peripheral wall of the rotor punching, and the outer peripheral wall of the rotor punching is provided with a plurality of protrusions, and the plurality of protrusions are distributed at intervals along the circumference of the rotor punching, and the installation groove is constructed between adjacent protrusions.

[0015] According to the rotor assembly of the second embodiment of the utility model, it includes the rotor core, the rotating shaft and a plurality of magnets described in the first embodiment, wherein the rotating shaft is passed through the shaft hole; and the plurality of magnets are respectively arranged in the plurality of mounting grooves.

[0016] The rotor assembly according to the embodiment of the utility model has at least the following beneficial effects:

[0017] The rotor assembly adopts the rotor core of the first aspect embodiment. The rotor assembly realizes uniform distribution of the magnets on the rotor punchings by arranging multiple installation grooves on the outer peripheral wall of the rotor punchings, and multiple magnets are respectively arranged in the multiple installation grooves; by staggering adjacent rotor punchings around the axis of the rotor core, multiple rotor punchings are overlapped, so that the surface thickness difference between each rotor punching can be evenly dispersed, reducing the error accumulation caused by the thickness difference on the surface of the rotor punchings, improving the flatness of the rotor core, and thus reducing the possibility of axial displacement of the rotor core shaft hole, ensuring that the shaft and the shaft hole can be accurately aligned, and improving the matching accuracy between the shaft and the shaft hole; and by arranging multiple grooves on the inner peripheral wall of the shaft hole, the multiple grooves are distributed at intervals along the circumferential direction of the rotor punchings, and the setting of the grooves can reduce the expansion stress generated by the interference fit between the shaft and the shaft hole, thereby reducing the possibility of deformation of the rotor core, improving the reliability and structural stability of the rotor assembly, and being suitable for motors.

[0018] The motor according to the embodiment of the third aspect of the utility model comprises the rotor assembly described in the embodiment of the second aspect.

[0019] The motor according to the embodiment of the utility model has at least the following beneficial effects:

[0020] The motor adopts the rotor assembly of the second aspect of the embodiment. Since the surface thickness differences between the rotor punchings in the rotor core of the rotor assembly can be evenly dispersed, the error accumulation caused by the thickness differences on the surfaces of the rotor punchings is reduced, the flatness of the rotor core is improved, and the possibility of axial deviation of the rotor core shaft hole is reduced, thereby ensuring that the rotating shaft and the shaft hole can be accurately aligned, and the matching accuracy between the rotating shaft and the shaft hole is improved; and by arranging a plurality of grooves on the inner circumferential wall of the shaft hole, the expansion stress generated by the interference fit between the rotating shaft and the shaft hole can be reduced, thereby reducing the possibility of deformation of the rotor core and improving the reliability and structural stability of the motor.

[0021] The industrial robot according to the fourth embodiment of the utility model comprises the motor described in the third embodiment.

[0022] The industrial robot according to the embodiment of the utility model has at least the following beneficial effects:

[0023] The industrial robot adopts the motor of the third aspect embodiment. Since the matching accuracy of the rotating shaft and the shaft hole of the rotor assembly is high and the possibility of deformation of the rotor core is low, the reliability and stability of the motor are higher, which is beneficial to improving the reliability of the operation of the industrial robot.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0026] Figure 1 An exploded view of three rotor punchings in a rotor core according to an embodiment of the utility model;

[0027] Figure 2 An exploded view of two adjacent rotor punchings in a rotor core according to an embodiment of the utility model;

[0028] Figure 3 A top view of a rotor punching sheet in a rotor core according to another embodiment of the utility model;

[0029] Figure 4 It is a schematic diagram of a rotor punching sheet in a rotor core of another embodiment of the utility model;

[0030] Figure 5 This is a top view of a rotor punching in a rotor core according to another embodiment of the utility model.

[0031] Figure Number:

[0032] Rotor core 1000;

[0033] Rotor punching 100; shaft hole 110; mounting groove 120; groove 130; axis 140; first rivet point 150; second rivet point 160; heat dissipation hole 170; protrusion 180;

[0034] A first punching piece 200 ; a first rivet point 210 ; a second rivet point 220 ; and a second punching piece 300 . DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] In the description of the utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0038] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0039] In the related art, the connection between the rotating shaft and the rotor core is usually connected by interference fit. Interference fit relies on the size of the shaft hole being slightly smaller than the size of the rotating shaft, thereby ensuring a tight connection between the two. However, when the rotating shaft is affected by external factors, the rotating shaft is prone to expansion, thereby exerting pressure on the inner wall of the shaft hole, causing the rotor core to deform.

[0040] To this end, some embodiments of the present invention provide a rotor core 1000, which is suitable for a motor, and specifically refers to Figures 1 to 5 The rotor core 1000 is shown for explanation.

[0041] It can be understood that the rotor core 1000 of the embodiment of the utility model can form a rotor assembly with the magnet, and the rotor assembly can be understood as the rotating part of the motor. Figure 1As shown, in the embodiment of the utility model, the rotor core 1000 includes: a plurality of rotor punchings 100, specifically, the plurality of rotor punchings 100 are stacked to form the rotor core 1000. The plurality of rotor punchings 100 are respectively provided with shaft holes 110, and the shaft holes 110 are arranged at the center of the rotor punchings 100. The shaft holes 110 of each rotor punching 100 are coaxial and interconnected, so as to form a cavity suitable for accommodating a rotating shaft. In this embodiment, the rotating shaft passes through the shaft holes 110 of each rotor punching 100 in sequence, so that the rotor assembly can stably rotate with the rotating shaft as the axis.

[0042] Reference Figure 1 As shown, in the embodiment of the utility model, the outer peripheral wall of the rotor sheet 100 is provided with a plurality of mounting grooves 120 for mounting magnets, and the plurality of mounting grooves 120 are distributed at intervals along the circumference of the rotor sheet 100, so as to realize that a plurality of magnets are arranged at intervals along the circumference of the rotor sheet 100 on the rotor sheet 100, so as to facilitate the plurality of magnets to generate a uniform magnetic field, thereby ensuring the operation effect and operation efficiency of the rotor assembly. The uniform arrangement of the magnets can make the magnetic field evenly distributed on the rotor core 1000, which not only ensures the electromagnetic induction effect of the magnetic field and improves the operation efficiency of the rotor assembly, but also can balance the forces in all directions of the rotor core 1000, and reduce the possibility of deformation of the rotor core 1000 due to stress concentration.

[0043] In another example, a plurality of mounting grooves 120 are provided between the edge of the rotor sheet 100 and the shaft hole 110, and the plurality of mounting grooves 120 are distributed at intervals along the circumference of the rotor sheet 100, so that a plurality of magnets are arranged at intervals along the circumference of the rotor core 1000 on the rotor core 1000, so that a plurality of magnets generate a uniform magnetic field, thereby ensuring the operation effect and efficiency of the rotor assembly. Specifically, the mounting grooves 120 penetrate the rotor sheet 100 along the axial direction of the rotor core 1000, and the magnets are provided in the mounting grooves 120.

[0044] Specifically, each mounting groove 120 is arranged to extend radially inwardly of the rotor punching 100, thereby maximizing the use of space and reducing the volume of the rotor assembly. In this embodiment, an N-pole magnet and an S-pole magnet can be respectively arranged in two adjacent mounting grooves 120, that is, the N-pole magnet and the S-pole magnet are arranged alternately along the circumferential direction of the rotor core 1000.

[0045] In order to reduce the expansion stress between the shaft and the shaft hole 110, refer to Figure 1As shown, in the embodiment of the utility model, the inner circumferential wall of the shaft hole 110 is provided with a plurality of grooves 130, and the plurality of grooves 130 are distributed at intervals along the circumference of the rotor punching 100, and each groove 130 is extended radially outwardly along the rotor punching 100. It can be understood that when the shaft expands due to heat, the provision of the grooves 130 can provide additional space for the expansion of the shaft, so that the expansion of the shaft can be compensated instead of directly squeezing the inner circumferential wall of the shaft hole 110, thereby reducing the expansion stress generated by the interference fit between the shaft and the shaft hole 110, thereby reducing the possibility of deformation of the rotor core 1000, and improving the reliability and structural stability of the rotor assembly. In the embodiment of the utility model, the grooves 130 can be arc grooves, semicircular grooves, or square grooves, which are not limited in this embodiment.

[0046] In the embodiment of the utility model, the rotor punching sheet 100 can be a punching sheet of a high magnetic permeability material such as a silicon steel sheet or a cobalt steel sheet. In one example, the rotor punching sheet 100 is a silicon steel sheet, which has the advantages of high magnetic permeability, low hysteresis loss, low coercive force, etc., and can reduce the energy loss of the motor and improve the efficiency of the motor. In addition, the silicon steel sheet has good mechanical strength and corrosion resistance, so that the motor can withstand the vibration and high temperature generated during operation.

[0047] It is understandable that the surfaces of rotor punchings produced in the same batch may be uneven at the same position due to the influence of machining accuracy. Based on this unevenness, when these rotor punchings are stacked, the uneven positions of each rotor punching will overlap with each other, resulting in a particular protrusion or depression at a certain position of the formed rotor core. The superposition effect of these uneven positions will cause the errors to accumulate, causing the skewness and warping of the rotor core to be more significant, which in turn causes the axial deviation of the shaft hole, affecting the interference fit between the shaft hole and the shaft.

[0048] For this purpose, refer to Figure 2 As shown, along the axial direction of the rotor core 1000, adjacent rotor punchings 100 are staggered around the axis 140 of the rotor core 1000, so that multiple rotor punchings 100 completely overlap. Specifically, multiple rotor punchings 100 are arranged along the axial direction of the rotor core 1000, and adjacent rotor punchings 100 are rotated and stacked. In one example, when stacking, the first punching 200 is first rotated counterclockwise by a certain angle, and then the first punching 200 is stacked on the second punching 300. It should be noted that the first punching 200 can be rotated clockwise or counterclockwise, and the rotation angle of the first punching 200 can be selected and set according to the actual processing conditions of the rotor punching 100.

[0049] It can be understood that this embodiment reduces the error accumulation caused by the thickness difference on the surface of the rotor punching sheets 100 by evenly dispersing the surface thickness difference between the rotor punching sheets 100, improves the flatness of the rotor core 1000, and thus reduces the possibility of axial deviation of the shaft hole 110 of the rotor core 1000, ensures that the shaft and the shaft hole 110 can be accurately aligned, improves the matching accuracy between the shaft and the shaft hole 110, and further reduces the possibility of deformation of the rotor core 1000 caused by the shaft squeezing the rotor core 1000.

[0050] Reference Figure 1 and Figure 4 As shown, in the embodiment of the utility model, the rotor punching 100 is provided with a plurality of first rivet points 150, and the plurality of first rivet points 150 are evenly distributed along the circumference of the rotor punching 100. Specifically, the first rivet points 150 are provided on the end surface of the rotor punching 100 along the axial direction of the rotor core 1000. Among them, the plurality of first rivet points 150 between adjacent rotor punchings 100 are buckled one by one, so that the plurality of rotor punchings 100 are connected to each other to form the rotor core 1000. The plurality of first rivet points 150 are evenly spaced along the circumference of the rotor punching 100 so that the forces at various positions of the rotor punching 100 in the circumferential direction are balanced, the possibility of deformation of the rotor punching 100 is reduced, and the structural stability of the rotor core 1000 is improved.

[0051] In one example, the first riveting point 150 is a groove body that is formed on the upper surface of the rotor punching 100 and is concave downward, and the groove body can be formed by punching downward from the upper surface of the rotor punching 100. It can be understood that the groove body forms a convex portion that protrudes downward on the lower surface of the rotor punching 100. Based on this, between adjacent rotor punchings 100, the convex portion on the lower surface of the rotor punching 100 located above can be buckled into the groove body on the upper surface of the rotor punching 100 located below, thereby achieving connection and fixation between the rotor punchings 100.

[0052] In order to prevent the rotor punching sheet 100 from being insufficient in strength due to excessive hollowing, refer to Figure 3As shown, in the embodiment of the utility model, the number of the first rivet points 150 is half of the number of the mounting slots 120, and the first rivet points 150 can be arranged between two adjacent mounting slots 120. For example, there are 10 mounting slots 120, and there are 5 first rivet points 150. It can be understood that in order to enable the first rivet points 150 to still be correspondingly fastened when the adjacent rotor punchings 100 are staggered, in this embodiment, the number of the first rivet points 150 is N, and the angle of the adjacent rotor punchings 100 staggered around the axis 140 of the rotor core 1000 is a, satisfying: a=360° / N. For example, there are 5 first rivet points 150, and the angle of the adjacent rotor punchings 100 staggered around the axis 140 of the rotor core 1000 is 72°.

[0053] Combination Figure 2 It can be understood that the first punch 200 and the second punch 300 both have a first rivet point 210 and a second rivet point 220 that are adjacently arranged, and the angle between the first rivet point 210 and the second rivet point 220 is a. When stacked, the first punch 200 can be rotated counterclockwise by an angle a so that the second rivet point 220 of the first punch 200 and the first rivet point 210 of the second punch 300 are connected correspondingly.

[0054] Reference Figure 1 and Figure 4 As shown, in the embodiment of the utility model, the rotor punching 100 is further provided with a plurality of second rivet points 160, and the plurality of second rivet points 160 are evenly distributed along the circumference of the rotor punching 100. Specifically, the second rivet points 160 are provided on the end surface of the rotor punching 100 along the axial direction of the rotor core 1000, and the second rivet points 160 are provided closer to the outer peripheral wall of the rotor punching 100 than the first rivet points 150, that is, the second rivet points 160 and the first rivet points 150 are distributed sequentially from outside to inside along the radial direction of the rotor punching 100. Among them, the plurality of second rivet points 160 between adjacent rotor punchings 100 are buckled one by one, so that the plurality of rotor punchings 100 are connected to each other to form the rotor core 1000. The provision of the second rivet points 160 can make the connection between the rotor punchings 100 more firm, and further improve the structural stability of the rotor core 1000.

[0055] In one example, the second riveting point 160 is a groove body that is formed on the upper surface of the rotor punching 100 and is concave downward, and the groove body can be formed by stamping downward from the upper surface of the rotor punching 100. It can be understood that the groove body forms a convex portion that protrudes downward on the lower surface of the rotor punching 100. Based on this, between adjacent rotor punchings 100, the convex portion on the lower surface of the rotor punching 100 located above can be buckled into the groove body on the upper surface of the rotor punching 100 located below, thereby achieving connection and fixation between the rotor punchings 100.

[0056] Reference Figure 4 As shown, in the embodiment of the utility model, the number of the first rivet points 150 is half of the number of the mounting slots 120, the number of the second rivet points 160 is the same as the number of the mounting slots 120, the first rivet point 150 can be arranged between two adjacent second rivet points 160, the second rivet points 160 and the mounting slots 120 are arranged one by one in the radial direction of the rotor punching 100, and the second rivet point 160 is located at the center of the mounting slot 120. It can be understood that the first rivet point 150 can be surrounded by the two second rivet points 160 closest to it to form a triangle, thereby providing a stronger structural support force and improving the structural stability of the rotor core 1000. In addition, more second rivet points 160 can make the force density of the periphery of the rotor punching 100 higher, reducing the possibility of deformation of the rotor punching 100 due to stress concentration.

[0057] Reference Figure 4 and Figure 5 As shown, in the embodiment of the utility model, the rotor punching 100 is further provided with a plurality of heat dissipation holes 170, and the plurality of heat dissipation holes 170 are distributed at intervals along the circumference of the rotor punching 100, and each heat dissipation hole 170 penetrates the rotor punching 100 along the axial direction of the rotor punching 100, thereby improving the heat dissipation performance of the rotor core 1000, reducing the possibility of overheating of the rotor core 1000 during operation, thereby enabling the rotor core 1000 to operate for a long time, and improving the durability of the rotor assembly.

[0058] Reference Figure 4 and Figure 5 As shown, in the embodiment of the utility model, the number of the heat dissipation holes 170 is the same as the number of the mounting slots 120, and the heat dissipation holes 170 and the mounting slots 120 are distributed one-to-one in the radial direction of the rotor punching 100, that is, a heat dissipation hole 170 is provided on one side of each magnet, thereby ensuring that each magnet has a corresponding heat dissipation channel, so that the heat generated by each magnet can be timely and effectively conducted to the external environment, thereby reducing the temperature of the magnet.

[0059] Reference Figure 4 and Figure 5 As shown, in the embodiment of the present invention, the heat dissipation holes 170 and the first rivet points 150 are arranged closer to the shaft hole 110 than the second rivet points 160. Specifically, the second rivet points 160 are arranged close to the mounting slots 120, and the first rivet points 150 and the heat dissipation holes 170 are arranged close to the shaft hole 110. The plurality of heat dissipation holes 170 are divided into a plurality of groups along the circumference of the rotor core 1000, and the plurality of groups of heat dissipation holes 170 are staggered with the plurality of first rivet points 150. Specifically, as Figure 5As shown, two heat dissipation holes 170 form a group, and one group of heat dissipation holes 170, namely two heat dissipation holes 170, is provided between two adjacent second rivet points 160. In this embodiment, the number of heat dissipation holes 170 included in each group may be the same or different.

[0060] In one example, each group includes the same number of heat dissipation holes 170, and a group of heat dissipation holes 170 is arranged between two adjacent second rivet points 160. The number of heat dissipation holes 170 in each group is not limited to two, and can be one, three, four or more.

[0061] Reference Figure 4 and Figure 5 As shown, in the embodiment of the utility model, the outer peripheral wall of the rotor punching 100 is provided with a plurality of protrusions 180, and the plurality of protrusions 180 are distributed at intervals along the circumference of the rotor punching 100. Specifically, the protrusions 180 are formed on the outer peripheral wall of the rotor punching 100 and protrude outward along the outer peripheral wall of the rotor punching 100. Based on this, a mounting groove 120 is formed between adjacent protrusions 180. In this embodiment, the plurality of protrusions 180 are arranged in a circular shape around the center of the rotor punching 100, that is, the circle surrounded by the plurality of protrusions 180 is a concentric circle with the shaft hole 110, so that the plurality of protrusions 180 can evenly fix the magnet on the circumference of the rotating shaft, so that the magnetic field generated by the magnet can be evenly distributed on the circumferential side of the rotating shaft, thereby ensuring the electromagnetic induction effect of the magnetic field. It should be noted that the protrusion 180 can be a convex hull or a convex column, and its outer contour line can be an arc or a polygon, etc., which is not limited in this embodiment.

[0062] The embodiment of the utility model further provides a rotor assembly, comprising the rotor core 1000 of the above embodiment, a rotating shaft and a plurality of magnets, wherein the rotating shaft is inserted into the shaft hole 110, and the rotating shaft is interference fit with the shaft hole 110. The plurality of magnets are respectively arranged in the plurality of mounting grooves 120, and the magnets are attached to the bottom wall of the mounting grooves 120.

[0063] The rotor assembly of this embodiment is provided with a plurality of mounting grooves 120 on the outer peripheral wall of the rotor punching 100, and a plurality of magnets are mounted in the plurality of mounting grooves 120 in a one-to-one correspondence, so that the magnets are evenly distributed on the rotor core 1000, so that the rotor core 1000 is subjected to an even force; adjacent rotor punchings 100 are staggered around the axis 140 of the rotor core 1000, so that the plurality of rotor punchings 100 completely overlap, so that the surface thickness difference between the rotor punchings 100 can be evenly dispersed, thereby reducing the error accumulation caused by the thickness difference on the surface of the rotor punchings 100 and improving the rotor core. The flatness of 1000 is improved, thereby reducing the possibility of axial deviation of the shaft hole 110 of the rotor core 1000, ensuring that the rotating shaft and the shaft hole 110 can be accurately aligned, and improving the matching accuracy of the rotating shaft and the shaft hole 110; in addition, by arranging a plurality of grooves 130 on the inner circumferential wall of the shaft hole 110, the plurality of grooves 130 are distributed at intervals along the circumference of the rotor punching 100, and the arrangement of the grooves 130 can reduce the expansion stress generated by the interference fit between the rotating shaft and the shaft hole 110, thereby reducing the possibility of deformation of the rotor core 1000 and improving the reliability and structural stability of the rotor assembly.

[0064] Since the rotor assembly adopts all the technical solutions of the rotor core 1000 of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be repeated here.

[0065] An embodiment of the utility model further provides a motor, comprising the rotor assembly of the above embodiment, specifically, the motor further comprises a stator assembly.

[0066] The motor of this embodiment is provided with a plurality of mounting grooves 120 on the outer peripheral wall of the rotor punching sheet 100, and a plurality of magnets are respectively installed in the plurality of mounting grooves, so that the magnets are evenly distributed on the rotor core 1000, so that the rotor core 1000 is subjected to an even force; the adjacent rotor punching sheets 100 are staggered around the axis 140 of the rotor core 1000, so that the plurality of rotor punching sheets 100 completely overlap, so that the surface thickness difference between the rotor punching sheets 100 can be evenly dispersed, thereby reducing the error accumulation caused by the thickness difference on the surface of the rotor punching sheets 100, and improving the rotor core 100. 00, thereby reducing the possibility of axial deviation of the shaft hole 110 of the rotor core 1000, ensuring that the rotating shaft and the shaft hole 110 can be accurately aligned, and improving the matching accuracy of the rotating shaft and the shaft hole 110; in addition, by arranging a plurality of grooves 130 on the inner circumferential wall of the shaft hole 110, the plurality of grooves 130 are distributed at intervals along the circumference of the rotor punching 100, and the arrangement of the grooves 130 can reduce the expansion stress generated by the interference fit between the rotating shaft and the shaft hole 110, thereby reducing the possibility of deformation of the rotor core 1000 and improving the reliability and structural stability of the motor.

[0067] Since the motor adopts all the technical solutions of the rotor assembly of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described in detail here.

[0068] An embodiment of the utility model further provides an industrial robot, comprising the motor of the above embodiment, wherein the motor is specifically a servo motor.

[0069] Specifically, the industrial robot includes a mechanical arm, and the motor is used to drive the various joints of the mechanical arm to move. The servo driver drives the motor to operate, thereby driving the mechanical arm to move. Since the matching accuracy of the rotating shaft of the rotor assembly and the shaft hole 110 is high, and the possibility of deformation of the rotor core 1000 is low, the reliability and stability of the motor are higher, which is conducive to improving the reliability of the operation of the industrial robot.

[0070] Since the industrial robot adopts all the technical solutions of the motor of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described in detail here.

[0071] Of course, the present invention is not limited to the above-mentioned embodiments, and technicians familiar with the field may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A rotor core, characterized in that: include: A plurality of rotor punchings are stacked and form an axial hole, the rotor punchings are provided with a plurality of mounting grooves for mounting magnets, the plurality of mounting grooves are distributed at intervals along the circumference of the rotor punchings, the inner circumferential wall of the rotor punchings is provided with a plurality of grooves, the plurality of grooves are distributed at intervals along the circumference of the rotor punchings; along the axial direction of the rotor core, adjacent rotor punchings are staggered around the axis of the rotor core so that the plurality of rotor punchings overlap.

2. The rotor core according to claim 1, characterized in that: The rotor punching sheet is provided with a plurality of first rivet points, and the plurality of first rivet points are evenly distributed along the circumference of the rotor punching sheet, and the plurality of first rivet points of adjacent rotor punching sheets are buckled in one-to-one correspondence.

3. The rotor core according to claim 2, characterized in that: The number of the first rivet points is N and is half the number of the mounting slots, and the angle at which adjacent rotor punchings are staggered around the axis of the rotor core is 360° / N.

4. The rotor core according to claim 2, characterized in that: The rotor punching is also provided with a plurality of second rivet points, which are evenly distributed along the circumference of the rotor punching. The second rivet points are arranged closer to the outer peripheral wall of the rotor punching than the first rivet points. The plurality of second rivet points of adjacent rotor punchings are buckled one by one.

5. The rotor core according to claim 4, characterized in that: The number of the first rivet points is half of the number of the mounting slots, the number of the second rivet points is the same as the number of the mounting slots, and the second rivet points and the mounting slots are spaced apart from each other along the radial direction of the rotor punching sheet.

6. The rotor core according to claim 4, characterized in that: The rotor punching is also provided with a plurality of heat dissipation holes, which are spaced apart along the circumference of the rotor punching. The number of the heat dissipation holes is the same as the number of the mounting slots, and the heat dissipation holes and the mounting slots are spaced apart along the radial direction of the rotor punching.

7. The rotor core according to claim 6, characterized in that: The heat dissipation holes and the first rivet points are arranged closer to the shaft hole than the second rivet points, and the plurality of heat dissipation holes are divided into a plurality of groups along the circumference of the rotor core, and the plurality of groups of heat dissipation holes are staggered with the plurality of the first rivet points.

8. The rotor core according to claim 1, characterized in that: The mounting groove is located on the outer peripheral wall of the rotor punching sheet. The outer peripheral wall of the rotor punching sheet is provided with a plurality of protrusions. The plurality of protrusions are distributed at intervals along the circumference of the rotor punching sheet. The mounting groove is constructed between adjacent protrusions.

9. A rotor assembly, characterized in that: include: The rotor core according to any one of claims 1 to 8; A rotating shaft, passing through the shaft hole; A plurality of magnets are respectively arranged in the plurality of mounting grooves.

10. A motor, characterized in that: Includes the rotor assembly as claimed in claim 9.

11. An industrial robot, characterized in that: The motor comprising the motor described in claim 10.

Images