Motor rotor structure
By using limiting rings, limiting strips, and limiting plates to partially encapsulate the magnets, the problems of magnetic leakage, inertia, and heat dissipation in the motor rotor structure are solved, thereby improving the stability and efficiency of the motor.
Patent Information
- Application Number
- CN202520064251.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-10
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-01-10
AI Technical Summary
The rotor structure of existing industrial permanent magnet synchronous motors has shortcomings in suppressing leakage flux and skin effect, dynamic balance, rotor inertia, heat dissipation and production cost, which makes it difficult for the motor power and efficiency to reach the optimal state.
The magnet is partially encapsulated by limiting rings, limiting strips and limiting plates. The limiting rings and limiting strips clamp the magnet to the rotor core, and the limiting plates are embedded in the gaps between the magnets to form a stable motor rotor structure.
It effectively prevents magnets from falling, adjusts magnetic field ripples, reduces rotor inertia, improves motor stability and response speed, reduces production costs, enhances heat dissipation, and improves overall motor performance.
Smart Images
Figure CN223957360U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to motor rotor technical field, concretely relates to a motor rotor structure. BACKGROUND
[0002] Now, with the enterprise automation degree unceasingly in-depth, the requirement of industrial permanent magnet synchronous motor is also more and more demanding. At present, motor rotor mainly has following two kinds:
[0003] I, IPM rotor
[0004] The current DC IPM embedded motor rotor assembly structure form, most of the silicon steel sheet and magnetic tile composition, in the IPM DC brushless motor operation, this rotor assembly for the rotor punching piece inside the leakage magnetic and skin effect inhibition effect is poor, at the same time, the process can not ensure that the magnetic tile vertical distribution in the slot, cause dynamic balance unstable and multiple technical problems.
[0005] At present, in the improvement motor power and efficiency technology aspect, must increase the magnetic effective area (i.e. main magnetic flux), thereby the air gap magnetic field density and flux linkage increase, reach the purpose of improving motor power and efficiency. However, the magnetic effective area increases while causing a substantial leakage, the skin effect enhancement causes excessive magnetic energy waste, at the same time, the volume of magnetic tile will increase, embedded process difficulty will increase, not only difficult to make the motor obtain the maximum magnetic energy utilization, reach the result of avoiding skin effect, and due to the abnormality of magnetic tile distribution perpendicularity, the efficiency and power performance of motor is difficult to achieve the optimal ideal state.
[0006] At present, the industry in the inhibition IPM brushless DC motor local leakage and embedded process, the commonly used method is to connect the rotor punching piece shaft hole, size on the limit narrow and open transition round form, avoid excessive magnetic energy to the inside, i.e. the shaft hole direction transition forms leakage and upper and lower fixed magnetic tile. However, this way not only causes the difficulty of processing technology to increase, and makes the motor in the process of high-speed running stress too concentrated, yield strength is too small to affect dynamic steady balance, causes torque ripple and other problems.
[0007] II, SPM rotor
[0008] The current SPM rotor is usually composed of a rotor core and a plurality of magnets, the magnets are around the rotor core and are adhesively fixed to the rotor core. At the same time, the entire outer ring of the rotor part is enclosed by a cylindrical protective sleeve made of plastic, carbon fiber or stainless steel material to ensure that the magnetic steel does not fall off during long-term operation. The existing SPM rotor has the following problems:
[0009] (1) due to the outer ring of the rotor part of the protective sleeve, the spacing between the SPM rotor and the stator is reduced, in order to ensure that the spacing between the rotor and the stator meets the requirements, the inner diameter of the stator needs to be increased, so that the spacing between the stator and the rotor part increases, and the motor power decreases;
[0010] (2) due to the outer ring of the rotor part of the protective sleeve, not only increases the rotor inertia, affects the motor response speed, but also increases the production cost, reduces the production efficiency, and hinders the air flow, which is not conducive to the heat dissipation of the rotor. Utility model content
[0011] In order to solve all or part of the above problems, the purpose of the utility model is to provide a motor rotor structure, which can improve the problem of motor power reduction, reduce the rotor inertia, ensure the motor response speed, reduce the production cost, improve the production efficiency and improve the heat dissipation effect of the rotor.
[0012] The utility model provides a kind of motor rotor structure, including rotor core and the rotor part of multiple magnet, and the motor rotor structure further includes:
[0013] Limiting ring, quantity is two, and is set to the corresponding end of the rotor part;
[0014] Limiting strip, equal to the number of the magnet, and is arranged with the interval between the magnet, and the both ends of each limiting strip are respectively integrally connected with the corresponding limiting ring;
[0015] The both ends of each magnet away from the side of the rotor core are respectively provided with limiting surface, and limiting groove is formed between adjacent two limiting surfaces, and multiple limiting strips are respectively embedded in the corresponding limiting groove, so that two limiting rings and multiple limiting strips are used to tighten multiple magnets on the rotor core.
[0016] Optionally, the intersection position of the outer side surface of the magnet and the two side walls is chamfered to form two limiting surfaces.
[0017] Optionally, the intersection position of the outer side surface of the magnet and the two side walls is chamfered to form two first inclined surfaces, the intersection position of the first inclined surface and the outer side surface of the magnet, the corresponding side wall and the corresponding end surface is chamfered to form two second inclined surfaces, and the first inclined surface and the corresponding two second inclined surfaces jointly constitute the limiting surface.
[0018] Optionally, there is a gap between adjacent two magnets, and a limiting piece is embedded in each gap, and one side of the limiting piece is connected with the rotor core, and the other side is integrally connected with the corresponding limiting strip.
[0019] Optionally, the width of the limiting ring is equal to the maximum width of the limiting strip in the radial direction of the rotor core.
[0020] Optionally, the width of the limiting ring is greater than the maximum width of the limiting strip in the radial direction of the rotor core, and the limiting sheet is integrally connected with the limiting ring.
[0021] Optionally, the limiting ring, the limiting strip and the limiting sheet are injection molded and fixed on the rotor part.
[0022] Optionally, the rotor core comprises a support body, the support body is in a cylindrical or cylindrical shape, and the magnets are adhesively fixed on the outer side surface of the support body.
[0023] Optionally, the rotor core comprises a plurality of supporting sheets stacked and arranged, and two adjacent supporting sheets are adhesively fixed respectively, each supporting sheet comprises a support sheet and a plurality of mounting sheets, the support sheet is in a circular plate shape or a circular ring shape, the plurality of mounting sheets are arranged around the periphery of the support sheet and integrally connected with the support sheet, and the plurality of mounting sheets are arranged in one-to-one correspondence with the plurality of magnets.
[0024] From the above technical solution, the motor rotor structure provided by the utility model has the following advantages:
[0025] The motor rotor structure partially encapsulates the magnets, effectively prevents the magnets from falling, at the same time, the partial encapsulation can ensure that the distance between the rotor part and the stator is smaller, so as to adjust the magnetic field ripple and improve the overall performance of the rotor, thereby improving the use stability of the motor. At the same time, the partial encapsulation can also reduce the rotor inertia, ensure the response speed of the motor, and reduce the production cost and improve the production efficiency. Moreover, the partial encapsulation increases the exposed area of the magnets, and the heat can be dissipated through the gap between the rotor part and the stator, effectively improving the heat dissipation effect of the rotor.
[0026] Other features and advantages of the utility model will be described in the subsequent description. BRIEF DESCRIPTION OF DRAWINGS
[0027] The accompanying drawings are used to provide a further understanding of the technical solutions of the utility model, and constitute a part of the description, and are used together with the embodiments of the utility model to explain the technical solutions of the utility model, and do not constitute a limitation on the technical solutions of the utility model.
[0028] Figure 1 It is a whole structure schematic view of the motor rotor structure in the embodiment 1 of the utility model;
[0029] Figure 2 It is a front view of the motor rotor structure in the embodiment 1 of the utility model;
[0030] Figure 3Structure schematic view of the rotor part in the embodiment 1 of the utility model;
[0031] Figure 4 Structure plan view of the rotor part in the embodiment 1 of the utility model;
[0032] Figure 5 Structure section view of the rotor part in the embodiment 1 of the utility model;
[0033] Figure 6 Structure schematic view of the magnet in the embodiment 1 of the utility model;
[0034] Figure 7 Structure plan view of the magnet in the embodiment 1 of the utility model;
[0035] Figure 8 Structure schematic view of the limiting ring, limiting strip and limiting sheet in the embodiment 1 of the utility model;
[0036] Figure 9 Structure schematic view of the limiting ring, limiting strip and limiting sheet in the embodiment 1 of the utility model;
[0037] Figure 10 Structure schematic view of the rotor core in the embodiment 1 of the utility model;
[0038] Figure 11 Structure schematic view of the magnet in the embodiment 2 of the utility model;
[0039] Figure 12 Front view of the limiting strip in the embodiment 2 of the utility model;
[0040] Figure 13 Front view of the rotor core in the embodiment 3 of the utility model;
[0041] Figure 14 Structure plan view of the rotor part in the embodiment 3 of the utility model;
[0042] Figure 15 Structure plan view of the rotor core in the embodiment 3 of the utility model.
[0043] Explanation of reference signs:
[0044] 1, rotor part;11, rotor core;12, magnet;2, limiting ring;3, limiting strip;4, limiting surface;41, limiting inclined surface;42, limiting arc surface;43, first inclined surface;44, second inclined surface;5, limiting groove;6, limiting sheet;7, support body;8, receiving sheet;81, supporting sheet;82, mounting sheet;9, gap. Specific implementation
[0045] In order to make the purpose, technical scheme and advantages of the utility model clearer and more apparent, the following will combine the drawings to make a detailed description of the embodiments of the utility model. It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other at will without conflict.
[0046] Embodiment 1
[0047] As Figures 1-10 shown in the utility model embodiment 1, the embodiment discloses a motor rotor structure, which comprises a rotor core 11 and a rotor part 1 composed of a plurality of magnets 12; the cross section of the magnet 12 is fan-shaped; the plurality of magnets 12 are equidistantly arranged around the periphery of the rotor core 11; meanwhile, the plurality of magnets 12 are respectively adhered and fixed to the rotor core 11. The number of the magnets 12 can be four, eight, ten or twelve, etc. The embodiment only shows the state of four magnets 12.
[0048] In one embodiment, as Figure 1 , Figure 2 shown, the two ends of the rotor part 1 are respectively provided with a circular limiting ring 2; a limiting strip 3 is arranged between the adjacent two magnets 12, that is, the plurality of magnets 12 and the plurality of limiting strips 3 are arranged at intervals, and the two end portions of each limiting strip 3 are respectively integrally connected with the corresponding limiting ring 2.
[0049] In one embodiment, as Figure 3 , Figure 4 , Figure 5 shown, the two end positions of each magnet 12 away from the rotor core 11 are respectively provided with a limiting surface 4; a limiting groove 5 is formed between the adjacent two limiting surfaces 4; and the plurality of limiting strips 3 are respectively fitted and arranged in the corresponding limiting grooves 5, so that the two limiting rings 2 and the plurality of limiting strips 3 jointly clamp the plurality of magnets 12 on the rotor core 11.
[0050] In one embodiment, as Figure 4 , Figure 6 shown, the intersection position between the outer side of the magnet 12 and the two side walls is respectively chamfered to form two limiting surfaces 4. It should be noted that the "outer side wall" of the magnet 12 refers to the arc surface away from the rotor core 11, and the "side wall" of the magnet 12 refers to the surface of the adjacent two magnets 12 close to each other.
[0051] In one embodiment, as Figure 6 shown, the chamfer is in the form of an inclined chamfer, so that the end portion of the magnet 12 forms a limiting inclined surface 41, and the limiting grooves 5 are formed between the two limiting inclined surfaces 41. Of course, in other embodiments, as Figure 7 shown, the chamfer can also be in the form of a rounded chamfer, so that the end portion of the magnet 12 forms a limiting arc surface 42, and the limiting grooves 5 are formed between the two limiting arc surfaces 42.
[0052] In one embodiment, as shown in Figure 5 , Figure 8 , there is a 1mm gap 9 between each two adjacent magnets 12, and a limiting piece 6 is fitted in each gap 9, with one side of the limiting piece 6 connected to the rotor core 11 and the other side integrally connected to the corresponding limiting strip 3.
[0053] In one embodiment, as shown in Figure 5 , the material of the rotor core 11 can be steel, aluminum alloy, any copper product, any iron-based material with an iron content of more than 50%, organic material, etc., and the limiting ring 2, the limiting strip 3 and the limiting piece 6 are made of PA, PBT, PPA, PPS, etc. plastics containing glass fibers, and the limiting ring 2, the limiting strip 3 and the limiting piece 6 are injection molded and fixed on the rotor part 1.
[0054] The production process of the motor rotor structure in this embodiment is as follows:
[0055] The rotor core 11 with qualified size is processed according to the process flow of material taking, numerical control turning, grinding, cleaning, passivation and full inspection, and the two ends of the magnet 12 are chamfered or finely ground to form limiting surfaces 4 with the same size at the two ends of the magnet 12. In this embodiment, the chamfering range is 0.1°-170°, and different wave magnetic fields can be obtained by adjusting the angle, which can be a sine wave or a saddle wave. In this embodiment, the chamfering angle is preferably 120°.
[0056] Then, the plurality of magnets 12 are fixed on the rotor core 11 by glue to form a glued assembly, ensuring that the limiting gap 9 between each two adjacent magnets 12 is 1mm, and then the glued assembly is baked and solidified, and then the outer diameter of the glued assembly is finely ground, thereby realizing the production of the rotor part 1.
[0057] Subsequently, the rotor part 1 is placed in an injection mold for plastic injection, the plastic fills the limiting groove 5 to form the limiting strip 3, the plastic enters the gap between each two adjacent magnets 12 to form the limiting piece 6, and the plastic forms the limiting ring 2 at the two ends of the rotor part 1, that is, the limiting ring 2, the limiting strip 3 and the limiting piece 6 realize the partial encapsulation of the magnet 12, thereby realizing the effective fixation of the magnet 12 and the rotor core 11.
[0058] The motor rotor structure in the embodiment realizes partial encapsulation of the magnets 12 through the limiting rings 2, the limiting strips 3 and the limiting sheets 6. The two limiting rings 2 can generate limiting forces along the axial direction of the rotor core 11 on the magnets 12 to realize limiting of the magnets 12 along the axial direction of the rotor core 11. The limiting strips 3 can generate limiting components along the radial direction of the rotor core 11 on the magnets 12 to realize limiting of the magnets 12 along the radial direction of the rotor core 11. Therefore, the two limiting rings 2 and the plurality of limiting strips 3 can clamp the plurality of magnets 12 on the rotor core 11, thereby realizing effective fixing of the magnets 12 and the rotor core 11 to prevent the magnets 12 from falling off. Moreover, the limiting sheets 6 are injection molded into the gaps 9 between the adjacent two magnets 12, and the limiting sheets 6 can realize further fixing of the adjacent two magnets 12 to ensure the connection stability of the magnets 12 and the rotor core 11.
[0059] Meanwhile, the motor rotor structure realizes partial encapsulation of the magnets 12, which can ensure that the gap between the rotor part 1 and the stator is smaller, ensure the motor power and improve the overall performance of the rotor. Meanwhile, the partial encapsulation can also reduce the rotor inertia, ensure the response speed of the motor, and reduce the production cost and improve the production efficiency. Moreover, the partial encapsulation increases the exposed area of the magnets 12, and the heat can be dissipated through the gap between the rotor part 1 and the stator, thereby effectively improving the heat dissipation effect of the rotor.
[0060] In one embodiment, as shown in Figure 8 , Figure 9 , the width of the limiting ring 2 is greater than the maximum width of the limiting strips 3 along the radial direction of the rotor core 11, and the limiting sheet 6 is integrally connected with the limiting ring 2. Of course, the width of the limiting ring 2 can also be equal to the maximum width of the limiting strips 3 along the radial direction of the rotor core 11, so that the exposed area of the magnets 12 is larger and the heat dissipation effect of the rotor is improved.
[0061] In one embodiment, as shown in Figure 4 , Figure 10 , the rotor core 11 includes a support body 7, the support body 7 is cylindrical or circular ring-shaped, and the magnets 12 are adhesively fixed on the outer side surface of the support body 7. The cylindrical or circular ring-shaped rotor core 11 has higher concentricity, and the magnets 12 are more easily adhesively fixed on the rotor core 11, thereby improving the production efficiency. In the embodiment, the support body 7 is preferably a cylindrical structure.
[0062] As known from the above, compared with the SPM rotor structure in the prior art, the motor rotor structure in the embodiment has better outer diameter roundness and inner and outer diameter concentricity, better dynamic balance, can prevent the magnets 12 from falling off through partial encapsulation of the magnets 12, can reduce the gap between the rotor part 1 and the stator, adjust the magnetic field ripple, improve the overall performance of the rotor, and further improve the stability of the product.
[0063] Embodiment 2
[0064] like Figure 11 , Figure 12 The present invention is shown in Embodiment 2. The difference between this embodiment and Embodiment 1 is that the outer surface of the magnet 12 and the two side walls are chamfered to form two first inclined surfaces 43. The first inclined surfaces 43 and the outer surface of the magnet 12, the corresponding side walls and the corresponding end faces are chamfered to form two second inclined surfaces 44. The first inclined surfaces 43 and the two corresponding second inclined surfaces 44 together constitute the limiting surface 4.
[0065] It should be noted that the "outer wall" of magnet 12 refers to the arc-shaped surface of magnet 12 away from rotor core 11, the "side wall" of magnet 12 refers to the surface of two adjacent magnets 12 that are close to each other, and the "end face" of magnet 12 refers to two parallel planes of magnet 12.
[0066] In one embodiment, such as Figure 11 , Figure 12 As shown, since the first inclined surface 43 and the two second inclined surfaces 44 together form the limiting surface 4, after the limiting strip 3 is injected into the limiting groove 5, the two ends of the limiting strip 3 respectively form limiting protrusions. The limiting protrusions can generate limiting forces on the magnet 12 along the axial and radial directions of the rotor core 11, and the limiting effect on the magnet 12 is better, so as to ensure the connection stability between the magnet 12 and the rotor core 11.
[0067] Example 3
[0068] like Figure 13 , Figure 14 , Figure 15 The illustration shows Embodiment 3 of this utility model. This embodiment differs from Embodiment 1 in that the rotor core 11 includes multiple stacked receiving plates 8, with adjacent receiving plates 8 bonded and fixed together. In this embodiment, the receiving plates 8 are preferably silicon steel sheets; in other embodiments, they may be made of other materials.
[0069] In one embodiment, such as Figure 13 , Figure 14 , Figure 15 As shown, each receiving piece 8 includes a support piece 81 and multiple mounting pieces 82. The support piece 81 is in the shape of a circular plate or a ring. The multiple mounting pieces 82 are evenly spaced around the support piece 81, and the mounting pieces 82 are integrally formed and connected to the support piece 81. The distance between two adjacent mounting pieces 82 is 1mm, and each mounting piece 82 corresponds to a magnet 12, meaning that the magnet 12 is bonded and fixed to a corresponding row of mounting pieces 82.
[0070] It should be noted that, unless otherwise stated, the technical or scientific terms used in this utility model shall have the ordinary meaning as understood by those skilled in the art to which this utility model pertains.
[0071] In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood to indicate or imply relative importance or imply a number of the technical features indicated. In the description of the present application, the meaning of "multiple" is more than two, unless otherwise specifically limited.
[0072] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. An electric motor rotor structure comprising a rotor core (11) and a rotor portion (1) consisting of a plurality of magnets (12), characterized by The motor rotor structure further comprises: limiting rings (2), two in number, arranged at the respective end portions of the rotor part (1); limiting strips (3), equal in number to the magnets (12), arranged in spaced relation with the magnets (12), and each of the limiting strips (3) is integrally connected with the corresponding limiting ring (2) at both ends thereof; each of the magnets (12) is provided with a limiting surface (4) at each of the two end portions thereof away from the rotor core (11), and each of the two limiting surfaces (4) is formed between two adjacent limiting grooves (5), and each of the limiting strips (3) is fitted into the corresponding limiting groove (5), so that the two limiting rings (2) and the plurality of limiting strips (3) together clamp the plurality of magnets (12) on the rotor core (11).
2. The electric machine rotor structure of claim 1, wherein, The intersection of the outer side surface of the magnet (12) and the two side walls is chamfered to form the two limiting surfaces (4).
3. The electric machine rotor structure of claim 1, wherein, The intersection of the outer side surface of the magnet (12) and the two side walls is chamfered to form two first chamfered surfaces (43), the intersection of the outer side surface of the magnet (12), the corresponding side wall and the corresponding end surface is chamfered to form two second chamfered surfaces (44), and the first chamfered surface (43) and the corresponding two second chamfered surfaces (44) together form the limiting surface (4).
4. The motor rotor structure according to claim 2 or 3, wherein each of the two adjacent magnets (12) is provided with a limiting gap (9) therebetween, and each of the limiting gaps (9) is fitted with a limiting piece (6) therein, and one side of the limiting piece (6) is connected with the rotor core (11) and the other side thereof is integrally connected with the corresponding limiting strip (3).
5. The electric machine rotor structure of claim 4, wherein, The width of the limiting ring (2) is equal to the maximum width of the limiting strip (3) in the radial direction of the rotor core (11).
6. The electric machine rotor structure of claim 4, wherein, The width of the limiting ring (2) is greater than the maximum width of the limiting strip (3) in the radial direction of the rotor core (11), and the limiting piece (6) is integrally connected with the limiting ring (2).
7. An electrical machine rotor structure according to claim 5 or 6, characterized in that The limiting ring (2), the limiting strip (3) and the limiting piece (6) are injection molded and fixed on the rotor part (1).
8. The electric machine rotor structure of claim 1, wherein, The rotor core (11) comprises a support body (7) in the shape of a cylinder or a circular cylinder, and the magnets (12) are adhesively fixed on the outer side surface of the support body (7).
9. The electric machine rotor structure of claim 1, wherein, The rotor core (11) comprises a plurality of stacked receiving pieces (8), and each of the two adjacent receiving pieces (8) is adhesively fixed, each of the receiving pieces (8) comprises a support piece (81) in the shape of a circular plate or a circular ring, and a plurality of mounting pieces (82) are arranged around the four positions of the support piece (81) and integrally connected with the support piece (81), and the plurality of mounting pieces (82) are one-to-one corresponding to the plurality of magnets (12).