Rotor punching sheet, motor rotor and motor
By setting cutting bridges and connecting holes on the rotor laminations, the mechanical strength of the motor rotor is improved and the leakage flux is reduced, thus solving the problems of mechanical strength and leakage flux of the motor rotor and improving the utilization rate of the magnets.
Patent Information
- Application Number
- CN202423075041.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-12
AI Technical Summary
While improving the mechanical strength of existing motor rotors, severe magnetic leakage occurs, leading to a reduction in the utilization rate of magnets.
A cut bridge is used to temporarily fix the outer and inner laminations of the rotor laminations together, and then fix them to the baffle with rivets. The magnetic isolation bridge is cut off to reduce magnetic leakage and improve the utilization rate of the magnets.
It enhances the mechanical strength of the motor rotor, while reducing magnetic leakage and improving the utilization rate of the magnets.
Smart Images
Figure CN223666114U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of permanent magnet synchronous motor technology, specifically to a rotor lamination, a motor rotor, and a motor. Background Technology
[0002] like Figure 5 and Figure 6 As shown, the motor rotor of the variable frequency compressor includes a rotor core 100 and baffles 200. The rotor core 100 is fixedly connected to the baffles 200 at both ends by rivets 300. The rotor core 100 is composed of multiple rotor laminations stacked together. Multiple magnetic slots 111 for mounting magnets 400 are distributed along the circumferential direction on the rotor laminations. In the radial direction, the magnetic slots 111 divide the rotor core into two parts (inner lamination part and outer lamination part), and the inner and outer parts are fixedly connected by a magnetic bridge 118.
[0003] Since the inner and outer parts of the rotor lamination are fixedly connected by a magnetic bridge, the radial dimension of the magnetic bridge becomes the decisive factor in the mechanical strength of the motor rotor. The larger the radial dimension of the magnetic bridge, the stronger the mechanical strength of the motor rotor. However, the presence of the magnetic bridge will cause some of the magnetic flux of the magnet to leak magnetic flux. Moreover, the larger the radial dimension of the magnetic bridge, the more magnetic flux leakage occurs, which reduces the utilization rate of the magnet.
[0004] Therefore, how to reduce the leakage flux of the motor rotor and ensure the mechanical strength of the motor rotor has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention
[0005] In view of this, the purpose of this utility model is to provide a rotor lamination to solve the technical problem that existing rotor motors cannot improve mechanical strength and reduce magnetic leakage.
[0006] The technical solution adopted by this utility model is as follows: a rotor lamination, wherein a plurality of magnetic slots are formed on the rotor lamination, the magnetic slots dividing the rotor lamination into an outer lamination part and an inner lamination part in the radial direction, the two ends of the outer lamination part in the circumferential direction are fixedly connected to the inner lamination part by a cutting bridge, the outer lamination part is formed with an outer connecting hole, and the inner lamination part is formed with an inner connecting hole.
[0007] Preferably, the radial dimension of the cutting bridge is 0.2mm to 0.5mm.
[0008] Preferably, the radial dimension of the cutting bridge is 0.3mm to 0.4mm.
[0009] Preferably, the outer punch portion is provided with at least two external connection holes.
[0010] Preferably, the outer lamination portion is provided with an outer connecting hole, and the axis of the outer connecting hole and the axis of the inner connecting hole are coplanar with the axis of the rotor lamination.
[0011] The second objective of this utility model is to provide a motor rotor, comprising a rotor core, baffles, outer rivets, and inner rivets. Two baffles are correspondingly disposed at both ends of the rotor core. The rotor core comprises multiple stacked rotor laminations, each lamination comprising an inner lamination portion and an outer lamination portion. The multiple outer lamination portions are distributed circumferentially outside the inner lamination portions. The outer and inner lamination portions are spaced apart radially to form a magnetic groove, and the two ends of the outer lamination portions circumferentially form a cutting groove communicating with the magnetic groove between the inner lamination portions. The outer rivets pass through the outer connecting holes on the outer lamination portions and are fixedly connected to the baffles. The inner rivets pass through the inner connecting holes on the inner lamination portions and are fixedly connected to the baffles. Magnets are installed in the magnetic grooves.
[0012] Preferably, the distance from the cutting groove to the rotor lamination axis is greater than the distance from the outer circumferential surface of the baffle to the rotor lamination axis.
[0013] Preferably, the dimension of the cutting groove in the radial direction of the rotor lamination is 0.2mm to 0.5mm, and the dimension of the cutting groove in the circumferential direction of the rotor lamination is 0.3mm to 1.5mm.
[0014] Preferably, the dimension of the cutting groove in the radial direction of the rotor lamination is 0.3mm to 0.4mm, and the dimension of the cutting groove in the circumferential direction of the rotor lamination is 0.3mm to 0.5mm.
[0015] The third objective of this invention is to provide an electric motor, including the aforementioned motor rotor.
[0016] The beneficial effects of this utility model are:
[0017] This invention utilizes the principle of spatial segmentation, forming external connecting holes on the outer lamination portion of the rotor lamination and internal connecting holes on the inner lamination portion. The two ends of the outer lamination portion are temporarily fixedly connected to the inner lamination portion via removable cutting bridges. When multiple rotor laminations are stacked to form a rotor core, the outer and inner lamination portions of the rotor core can be fixedly connected to the baffles via multiple rivets, indirectly achieving a fixed connection between the outer and inner lamination portions and ensuring the mechanical strength of the rotor core. Simultaneously, by removing the cutting bridges between the inner and outer lamination portions of the rotor core, magnetic leakage caused by the magnetic isolation bridge is reduced, thereby improving the utilization rate of the magnets. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the rotor lamination of this utility model;
[0019] Figure 2 This is a front view of the motor rotor of this utility model;
[0020] Figure 3 This is a side view of the motor rotor of this utility model;
[0021] Figure 4 This is a schematic diagram of the motor rotor of this utility model;
[0022] Figure 5 This is a schematic diagram of the structure of an existing motor rotor;
[0023] Figure 6 This is a front view of the existing motor rotor.
[0024] Explanation of the reference numerals in the figure:
[0025] 100. Rotor core;
[0026] 110. Rotor laminations;
[0027] 111. Magnet slot; 112. Outer lamination section; 113. Inner lamination section; 114. Cutting bridge; 115. Outer connecting hole; 116. Inner connecting hole; 117. Cutting groove; 118. Magnetic isolation bridge; 119. Rotor shaft hole;
[0028] 200. Baffle;
[0029] 300. Rivets;
[0030] 310. External rivet; 320. Internal rivet;
[0031] 400. Magnet steel. Detailed Implementation
[0032] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.
[0033] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0035] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0036] Examples, such as Figures 1-4 As shown, a rotor lamination 110 has multiple magnetic slots 111 formed on it. The magnetic slots 111 divide the rotor lamination 110 into an outer lamination portion 112 and an inner lamination portion 113 in the radial direction. The two ends of the outer lamination portion 112 in the circumferential direction are fixedly connected to the inner lamination portion 113 by a cutting bridge 114. The outer lamination portion 112 has an outer connecting hole 115 formed on it, and the inner lamination portion 113 has an inner connecting hole 116 formed on it.
[0037] This invention utilizes the principle of spatial segmentation. An external connecting hole 115 is formed on the outer lamination portion 112 of the rotor lamination 110, and an internal connecting hole 116 is formed on the inner lamination portion 113 of the rotor lamination 110. The two ends of the outer lamination portion 112 are temporarily fixedly connected to the inner lamination portion 113 via a cuttable bridge 114. When multiple rotor laminations 110 are stacked to form a rotor core 100, multiple rivets 300 can be used to fix the outer lamination portion 112, the inner lamination portion 113, and the baffle 200 respectively, indirectly achieving a fixed connection between the outer lamination portion 112 and the inner lamination portion 113, thus ensuring the mechanical strength of the rotor core 100. Simultaneously, by removing the cuttable bridge 114 between the inner lamination portion 113 and the outer lamination portion 112 of the rotor core 100, the leakage flux caused by the magnetic isolation bridge is reduced, thereby improving the utilization rate of the magnets.
[0038] Specific embodiment 1, such as Figures 1-4 As shown, a rotor lamination 110 has a rotor shaft hole 119 formed on it. The rotor shaft hole 119 is coaxially arranged with the rotor lamination 110, so that the rotor lamination 110 is generally annular.
[0039] Four magnetic slots 111 are formed on the rotor lamination 110. The four magnetic slots 111 are evenly distributed along the circumference of the rotor lamination 110, and the magnetic slots 111 are formed on the rotor lamination 110 along the tangential direction of the rotor lamination 110. That is, the axis of the rotor lamination 110 is located on the vertical plane of the magnetic slots 111.
[0040] In the radial direction of the rotor lamination 110, the magnet slot 111 divides the rotor lamination 110 into an outer lamination portion 112 and an inner lamination portion 113. In the circumferential direction of the rotor lamination 110, the two ends of the outer lamination portion 112 are fixedly connected to the inner lamination portion 113 by a cutting bridge 114. The radial dimension of the cutting bridge 114 is 0.2mm to 0.5mm, that is, in the radial direction of the rotor lamination 110, the thickness of the cutting bridge 114 is 0.2mm to 0.5mm.
[0041] Preferably, the radial dimension of the cutting bridge 114 is 0.3 mm to 0.4 mm.
[0042] At least one external connecting hole 115 is formed on the outer lamination portion 112 to cooperate with the rivet 300, so that the outer lamination portion 112 of the rotor core 100 can be fixedly connected to the baffle 200; an internal connecting hole 116 is formed on the inner lamination portion 113 to cooperate with the rivet 300, so that the inner lamination portion 113 of the rotor core 100 can be fixedly connected to the baffle 200.
[0043] Specifically, each outer lamination 112 is provided with an outer connecting hole 115. The number of inner connecting holes 116 on the inner lamination 113 is equal to the number of outer laminations 112. The position of each inner connecting hole 116 is directly opposite to the position of each outer connecting hole 115. That is, the axis of the outer connecting hole 115, the axis of the inner connecting hole 116 and the axis of the rotor lamination 110 are coplanar.
[0044] In other embodiments, each outer punch portion 112 is provided with two outer connecting holes 115, and the number of inner connecting holes 116 on the inner punch portion 113 is equal to the number of outer punch portions 112. The position of each inner connecting hole 116 is directly opposite to the position of the two outer connecting holes 115, that is, the axis of the inner connecting hole 116 is located on the symmetry plane of the two outer connecting holes 115. This makes the three rivets 300 connecting the outer punch portion 112, the inner punch portion 113 and the two baffles 200 form a triangle, thereby improving the stability of the indirect connection between the outer punch portion 112 and the inner punch portion 113.
[0045] Specific embodiment 2, such as Figure 2 , Figure 3 and Figure 4As shown, an electric motor rotor includes a rotor core 100, baffles 200, outer rivets 310 and inner rivets 320. There are two baffles 200, and the two baffles 200 are arranged one-to-one at both ends of the rotor core 100.
[0046] The rotor core 100 includes a plurality of stacked rotor laminations 110. Each rotor lamination 110 includes a square inner lamination portion 113 and a plurality of fan-shaped outer lamination portions 112. The plurality of outer lamination portions 112 are evenly distributed along the circumferential direction on the outside of the inner lamination portion 113. The outer lamination portions 112 and the inner lamination portions 113 are spaced apart in the radial direction to form a magnetic groove 111. The two ends of the outer lamination portion 112 in the circumferential direction form a cutting groove 117 between the inner lamination portion 113 and the cutting groove 117, which communicates with the magnetic groove 111. That is, one end of the cutting groove 117 penetrates the outer wall of the rotor lamination 110, and the other end of the cutting groove 117 communicates with the magnetic groove 111.
[0047] Preferably, the distance from the cutting groove 117 to the axis of the rotor lamination 110 is greater than the distance from the outer circumferential surface of the baffle 200 to the axis of the rotor lamination 110, so as to facilitate the cutting and forming of the cutting groove 117.
[0048] The outer rivet 310 passes through the outer connecting hole 115 on the outer punch portion 112, and both ends of the outer rivet 310 are fixedly connected to the baffle 200; the inner rivet 320 passes through the inner connecting hole 116 on the inner punch portion 113, and both ends of the inner rivet 320 are fixedly connected to the baffle 200.
[0049] A magnet 400 is installed inside the magnet trough 111.
[0050] Preferably, the dimension of the cutting groove 117 in the radial direction of the rotor lamination 110 is 0.2mm to 0.5mm, and the dimension of the cutting groove 117 in the circumferential direction of the rotor lamination 110 is 0.3mm to 1.5mm.
[0051] More preferably, the dimension of the cutting groove 117 in the radial direction of the rotor lamination 110 is 0.3mm to 0.4mm, and the dimension of the cutting groove 117 in the circumferential direction of the rotor lamination 110 is 0.3mm to 0.5mm.
[0052] Specific embodiment 3: An electric motor, including the motor rotor described above.
[0053] The assembly process of the motor rotor of this utility model is as follows:
[0054] The motor rotor of this invention adopts a non-magnetic bridge structure. The magnetic bridge on the rotor lamination is replaced by a cut bridge with a width of no more than 0.5mm. The inner and outer laminations on both sides of the magnet slot are temporarily fixedly connected. Inner and outer connecting holes are set on the iron core and baffles. When assembling the motor rotor, the various structural components can be riveted together by passing inner and outer rivets through the rivet holes on the rotor iron core and the baffles at both ends. After assembly, the cut bridge on the rotor iron core is cut off. The motor rotor achieves structural integrity through riveting.
[0055] This invention can reduce magnetic leakage, thereby improving magnet utilization. Taking a 6-pole motor as an example, technical simulation shows that the magnetic leakage ratio can be reduced from 14% to 2%.
[0056] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.
Claims
1. A rotor lamination, characterized in that, The rotor lamination (110) has a plurality of magnetic slots (111) formed thereon. The magnetic slots (111) divide the rotor lamination (110) in the radial direction into an outer lamination part (112) and an inner lamination part (113). The two ends of the outer lamination part (112) in the circumferential direction are fixedly connected to the inner lamination part (113) through a cutting bridge (114). The outer lamination part (112) has an outer connecting hole (115) formed thereon, and the inner lamination part (113) has an inner connecting hole (116) formed thereon.
2. A rotor lamination according to claim 1, characterized in that, The radial dimension of the cut bridge (114) is 0.2 mm to 0.5 mm.
3. A rotor lamination according to claim 2, characterized in that, The radial dimension of the cut bridge (114) is 0.3 mm to 0.4 mm.
4. A rotor lamination according to claim 1, characterized in that, The outer punch portion (112) is provided with at least two external connection holes (115).
5. A rotor lamination according to claim 1, characterized in that, An external connecting hole (115) is provided on the outer lamination portion (112), and the axis of the external connecting hole (115), the axis of the inner connecting hole (116) and the axis of the rotor lamination (110) are coplanar.
6. A motor rotor, characterized in that, The rotor core (100) includes a rotor core (100), baffles (200), outer rivets (310), and inner rivets (320). Two baffles (200) are respectively disposed at both ends of the rotor core (100). The rotor core (100) includes a plurality of stacked rotor laminations (110). Each rotor lamination (110) includes an inner lamination portion (113) and an outer lamination portion (112). The plurality of outer lamination portions (112) are distributed circumferentially outside the inner lamination portions (113). The outer lamination portions (112) and the inner lamination portions (113) are radially... The magnetic steel groove (111) is formed by an upward spacing, and the two ends of the outer punch portion (112) and the inner punch portion (113) form a cutting groove (117) that communicates with the magnetic steel groove (111); the outer rivet (310) passes through the outer connecting hole (115) on the outer punch portion (112) and is fixedly connected to the baffle (200); the inner rivet (320) passes through the inner connecting hole (116) on the inner punch portion (113) and is fixedly connected to the baffle (200); a magnet (400) is installed in the magnetic steel groove (111).
7. A motor rotor according to claim 6, characterized in that, The distance from the cutting groove (117) to the axis of the rotor lamination (110) is greater than the distance from the outer circumferential surface of the baffle (200) to the axis of the rotor lamination (110).
8. A motor rotor according to claim 6, characterized in that, The cutting groove (117) has a radial dimension of 0.2 mm to 0.5 mm on the rotor lamination (110) and a circumferential dimension of 0.3 mm to 1.5 mm on the rotor lamination (110).
9. A motor rotor according to claim 8, characterized in that, The cutting groove (117) has a radial dimension of 0.3 mm to 0.4 mm on the rotor lamination (110) and a circumferential dimension of 0.3 mm to 0.5 mm on the rotor lamination (110).
10. An electric motor, characterized in that, Includes the motor rotor as described in any one of claims 6-9.