Rotor structure and motor with same

Abstract

The utility model discloses a rotor structure and a motor having the same, the rotor structure comprises a rotor assembly and a rotating shaft, the rotor assembly sleeves the rotating shaft, and the rotor assembly comprises a rotor body sleeving the rotating shaft; the injection molding body wraps the rotor body, and the injection molding body comprises a first end face and a second end face which are oppositely arranged in the axis direction of the rotor body; the first end face is provided with one or more first weight compensation blocks, the second end face is provided with one or more second weight compensation blocks, and the first weight compensation blocks and the second weight compensation blocks are integrally formed with the injection molding body. The problem that in the prior art, the dynamic unbalance amount of the rotor needs to be corrected in the motor rotor production process, and consequently the production process is complex is solved.

Description

Technical Field

[0001] The present application relates to the technical field of motor rotors, and in particular to a rotor structure and a motor having the same. Background Art

[0002] The rotor and stator are two essential components for the operation of the motor. When the motor is running, the motor rotor rotates relative to the motor stator, thereby outputting power.

[0003] Due to problems such as uneven materials or process errors, the rotor will be dynamically unbalanced during operation. The weight of the rotor is uneven, with a smaller weight on the flat side of the shaft extension and a larger weight on the flat side of the non-shaft extension. This will cause a large amount of dynamic imbalance in the rotor, resulting in large vibration and noise in the motor. Therefore, the rotor is usually dynamically balanced before the motor is assembled.

[0004] In the prior art, in order to adjust the dynamic unbalance of the rotor, a counterweight is usually added to the shaft or the shaft body is lightened, and then the dynamic unbalance of the rotor is adjusted to a predetermined standard through repeated corrections.

[0005] However, the above adjustment method requires the staff to make repeated adjustments according to the actual dynamic unbalance of the rotor, which increases the calibration process and labor costs, makes the production process more complicated, and also reduces the assembly efficiency of the motor. Utility Model Content

[0006] The main purpose of the present application is to provide a rotor structure and a motor having the same, so as to solve the problem in the prior art that the dynamic imbalance of the rotor needs to be corrected during the production of the motor rotor, which leads to complicated production processes.

[0007] According to one aspect of the present application, a rotor structure is provided, including a rotor assembly and a rotating shaft, wherein the rotor assembly is sleeved on the rotating shaft, and the rotor assembly includes: a rotor body sleeved on the rotating shaft; an injection molded body covered on the rotor body, the injection molded body including a first end face and a second end face relatively arranged along the axial direction of the rotor body; one or more first auxiliary weight blocks are arranged on the first end face, and one or more second auxiliary weight blocks are arranged on the second end face, and the first auxiliary weight blocks and the second auxiliary weight blocks are an integrally molded structure with the injection molded body.

[0008] Furthermore, a flat surface is provided on the rotating shaft, the flat surface faces the first direction, and the flat surface and the first end surface are located on the same side of the rotor body; with the plane where the flat surface is located as the dividing plane, the injection molded body is divided into a first injection molded body and a second injection molded body, the first injection molded body is located in the first direction, and the second injection molded body is located in the second direction, the first direction is opposite to the second direction, at least part of the first end surface is located on the first injection molded body, and at least part of the second end surface is located on the second injection molded body; the first supplementary weight block is located on the first injection molded body, and the second supplementary weight block is located on the second injection molded body.

[0009] Furthermore, the rotor body includes multiple rotor cores, and the rotor assembly also includes: a first slot body, which is arranged on the first end face, at least part of the rotor core is opposite to the first slot body, there are multiple first slot bodies, and the multiple first slot bodies are arranged one-to-one corresponding to the multiple rotor cores; the first supplementary weight block is arranged in the first slot body.

[0010] Furthermore, a spacing body is arranged between two adjacent first slot bodies, the spacing body is opposite to the magnetic steel of the rotor body, there are multiple spacing bodies, and the multiple spacing bodies are arranged one-to-one corresponding to the multiple magnetic steels; the multiple spacing bodies include a reference spacing body, and the positive projection surface of the reference spacing body along the radial direction of the rotor body is located on the extension surface of the flat surface along the axial direction; the multiple first slot bodies include a first filling slot body and a second filling slot body, the reference spacing body is located between the first filling slot body and the second filling slot body, and the first filling slot body and the second filling slot body are respectively provided with first weight blocks.

[0011] Furthermore, an extension surface of the flat surface along the axial direction of the rotating shaft is opposite to a first slot body among the plurality of first slot bodies; and a first supplementary weight block is respectively arranged in each first slot body on the first injection molded body.

[0012] Furthermore, taking the axial direction of the rotor body as the thickness direction, the thickness of the first supplementary weight block is H1, 0mm

[0013] Furthermore, the rotor body includes multiple rotor cores, and the rotor assembly also includes: a second slot body, which is arranged on the second end face, at least part of the rotor core is opposite to the second slot body, there are multiple second slot bodies, and the multiple second slot bodies are arranged one-to-one corresponding to the multiple rotor cores; the second supplementary weight block is arranged in the second slot body.

[0014] Furthermore, the multiple second troughs include a third filling trough and a fourth filling trough, and the projection surfaces of the third filling trough and the fourth filling trough on the first end surface are symmetrically arranged with respect to the center of the first filling trough and the second filling trough; the third filling trough and the fourth filling trough are respectively provided with second weight blocks.

[0015] ​Furthermore, the rotor body includes multiple rotor cores, and the rotor assembly also includes: a second slot body, which is arranged on the second end face, at least part of the rotor core is opposite to the second slot body, there are multiple second slot bodies, and the multiple second slot bodies are arranged one-to-one corresponding to the multiple rotor cores; at least two of the multiple second slot bodies on the second injection molded body are respectively provided with second supplementary weight blocks.

[0016] Furthermore, taking the axial direction of the rotor body as the thickness direction, the thickness of the second supplementary weight block is H2, 0mm<H2≤30mm.

[0017] Furthermore, the total weight of the first supplementary weight block on the first end surface is m 1 , the total weight of the second weight block on the second end face is m 2 ; Among them, r 1 is the distance from the center of mass of the flat surface to the center of the axis of rotation; L is the horizontal distance between the first end surface and the second end surface; L 2 L is the horizontal distance between the centroid of the flattened surface and the second end surface; 1 is the horizontal distance between the center of mass of the flat surface and the first end surface; m is the weight missing from the flat surface relative to the rotation axis; and r is the vertical distance between the flat surface and the axis of the rotation axis.

[0018] On the other hand, the present application also provides a motor, including a rotor structure and a stator, wherein the rotor structure is the above-mentioned rotor structure.

[0019] Compared with the prior art, the technical solution of this application has at least the following technical effects:

[0020] According to the rotor structure provided by the present application, a first supplementary weight block is arranged on the first end face of the injection-molded body, and a second supplementary weight block is arranged on the second end face of the injection-molded body, and the first supplementary weight block and the second supplementary weight block are an integral injection-molded structure with the injection-molded body. After the injection molding is completed, the two sides of the rotor body are directly supplemented with weight, and the dynamic imbalance caused by the rotating shaft is compensated by the first supplementary weight block and the second supplementary weight block. In addition, such a setting can also save the dynamic balancing correction process for the rotor structure. The corresponding weight of the injection molding material is directly added during the injection molding process, and the dynamic imbalance of the rotor after injection molding can be kept within a limited range, which simplifies the production process, saves labor costs, and improves the assembly efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0022] Figure 1It is a structural schematic diagram of an embodiment of a rotor structure disclosed in this application;

[0023] Figure 2 A front view of a first end surface of the rotor structure disclosed in the present application;

[0024] Figure 3 for Figure 2 Sectional view of the middle BB plane;

[0025] Figure 4 A front view of a second end surface of the rotor structure disclosed in the present application;

[0026] Figure 5 It is a structural schematic diagram of the third embodiment of the rotor structure disclosed in this application.

[0027] The above drawings include the following reference numerals:

[0028] 100, cutting surface; 1, rotor assembly; 2, rotating shaft; 10, rotor body; 11, injection molded body; 101, first end face; 102, second end face; 3, first supplementary weight block; 4, second supplementary weight block; 20, flat surface; 110, first injection molded body; 111, second injection molded body; 12, rotor core; 13, first slot body; 14, spacing body; 140, reference spacing body; 131, first filling slot body; 132, second filling slot body; 16, second slot body; 161, third filling slot body; 162, fourth filling slot body. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0032] According to the background technology mentioned, in the prior art, due to the machining error of the rotating shaft and the flat structure and other reasons, the rotor will be dynamically unbalanced during the rotation process. Therefore, it is necessary to continuously add weight to the rotor and repeatedly debug it during the dynamic balancing test to compensate for the rotor dynamic imbalance caused by the rotating shaft. In this way, in the process of assembling the rotor structure, a process is added, and the labor cost is increased, which reduces the assembly efficiency of the motor. In order to solve the above technical problems, the present application provides a rotor structure, a first supplementary weight block 3 is arranged on the first end face 101 of the injection molding body 11, and a second supplementary weight block 4 is arranged on the second end face 102 of the injection molding body 11, and the first supplementary weight block 3 and the second supplementary weight block 4 are respectively integrally molded with the injection molding body 11. In the process of injection molding the rotor body 10, filling injection plastics are added to the molds for forming the first end face 101 and the second end face 102, respectively, so that the first supplementary weight block 3 and the second supplementary weight block 4 are obtained after injection molding. After the injection molding of the rotor body 10 is completed, the weighting process on both sides of the rotor body 10 is completed, and there is no need to correct the dynamic balance of the rotor separately, which can save the correction process of the dynamic balance of the rotor. In one embodiment of the present application, by calculating the weight of the first weight block 3 and the second weight block 4 before injection molding, the mass of the injection material to be added is obtained, so that the dynamic unbalance of the rotor after injection molding is within 500 mg.

[0033] See also Figures 1 to 5As shown, the present application provides a rotor structure, including a rotor assembly 1 and a rotating shaft 2, the rotor assembly 1 is sleeved on the rotating shaft 2, and the rotor assembly 1 includes: a rotor body 10, sleeved on the rotating shaft 2; an injection molded body 11, covered on the rotor body 10, the injection molded body 11 includes a first end face 101 and a second end face 102 arranged opposite to each other along the axial direction of the rotor body 10; one or more first supplementary weight blocks 3 are arranged on the first end face 101, and one or more second supplementary weight blocks 4 are arranged on the second end face 102, and the first supplementary weight blocks 3 and the second supplementary weight blocks 4 are respectively integrated with the injection molded body 11 as an integral structure.

[0034] According to the rotor structure provided in the present application, it includes a rotor assembly 1 and a rotating shaft 2. The rotor assembly 1 includes a rotor body 10 and an injection molded body 11. The rotor body 10 includes a rotor core 12, a shaft sleeve and a permanent magnet. The rotor core 12, the shaft sleeve and the permanent magnet are integrally injection molded by injection molding to form the injection molded body 11, so as to improve the structural strength of the rotor body 10. The injection molded body 11 includes a first end face 101 and a second end face 102 that are relatively arranged along the axial direction of the rotor body 10. One or more first supplementary weight blocks 3 are arranged on the first end face 101, and one or more second supplementary weight blocks 3 are arranged on the second end face 102. The weight block 4, and the first weight block 3 and the second weight block 4 are respectively an integral injection molding structure with the injection molding body 11, so that after the injection molding is completed, the two sides of the rotor body are directly weighted, and the first weight block 3 and the second weight block 4 are used to compensate for the dynamic imbalance caused by the rotating shaft 2. In addition, this arrangement can also save the dynamic balancing correction process for the rotor structure. Before injection molding, the weight required to be supplemented on both sides of the injection molding body 11 is calculated, and the corresponding weight of the injection molding material is directly added during the injection molding process. The dynamic imbalance of the rotor after injection molding is maintained within 500 mg, which simplifies the production process and saves labor costs.

[0035] Specifically, Figures 2 to 4As shown, the rotating shaft 2 has a flat surface 20, which faces the first direction, and the flat surface 20 and the first end surface 101 are located on the same side of the rotor body 10; the plane where the flat surface 20 is located is used as the cutting surface 100, and the injection molded body 11 is divided into a first injection molded body 110 and a second injection molded body 111, the first injection molded body 110 is located in the first direction, and the second injection molded body 111 is located in the second direction, the first direction is opposite to the second direction, at least a part of the first end surface 101 is located on the first injection molded body 110, and at least a part of the second end surface 102 is located on the second injection molded body 111; the first supplementary weight block 3 is located on the first injection molded body 110, and the second supplementary weight block 4 is located on the second injection molded body 111. Due to the existence of the flat surface 20 on the shaft 2, the mass distribution of the rotor is uneven during the rotation process. The flat surface 20 is formed by milling part of the main body of the shaft 2 during the processing of the shaft 2, that is, the mass of the shaft 2 corresponding to the area where the flat surface 20 is located is missing. Therefore, the plane where the flat surface 20 is located is used as the cutting plane 100 to divide the injection molded body 11 into a first injection molded body 110 and a second injection molded body 111. The first injection molded body 110 and the flat surface 20 are located on the same side, so that a first supplementary weight block 3 is set on the first injection molded body 110. According to the position of the flat surface 20, the first supplementary weight block 3 is used to make up for the missing weight in the area where the flat surface 20 is located. Furthermore, in order to balance the weight of the injection molded body 11, a second supplementary weight block 4 is set on the second injection molded body 111, so that the dynamic unbalance of the rotor body 10 during the rotation process reaches a predetermined value.

[0036] In the specific implementation process, Figure 2 As shown, the rotor body 10 includes a plurality of rotor cores 12, and the rotor assembly 1 also includes: a first slot body 13, which is arranged on the first end face 101, at least part of the rotor core 12 is opposite to the first slot body 13, there are a plurality of first slot bodies 13, and the plurality of first slot bodies 13 are arranged one-to-one with the plurality of rotor cores 12; and a first supplementary weight block 3 is arranged in the first slot body 13. The first supplementary weight block 3 is arranged in the first slot body 13, so that the overall structure of the injection molding body 11 can be made more compact, and at the same time, during the injection molding process, the position of the mold for forming the first slot body 13 can be directly adjusted without adding a new filling structure to the mold. Preferably, the surface of the first supplementary weight block 3 and the first end face 101 are located in the same plane, so that the first supplementary weight block 3 is prevented from protruding relative to the first end face 101 during the assembly of the motor, and the first supplementary weight block 3 is prevented from interfering with other components in the motor.

[0037] In the first embodiment provided in this application, Figure 2As shown, the number of rotor cores 12 is an even number, and a spacing body 14 is arranged between two adjacent first slot bodies 13. The spacing body 14 is opposite to the magnetic steel of the rotor body 10. There are multiple spacing bodies 14, and the multiple spacing bodies 14 are arranged one-to-one corresponding to the multiple magnetic steels; the multiple spacing bodies 14 include a reference spacing body 140, and the positive projection surface of the reference spacing body 140 along the radial direction of the rotor body 10 is located on the extension surface of the flat surface 20 along the axial direction; the multiple first slot bodies 13 include a first filling slot body 131 and a second filling slot body 132, and the reference spacing body 140 is located between the first filling slot body 131 and the second filling slot body 132, and the first filling slot body 131 and the second filling slot body 132 are respectively provided with a first supplementary weight block 3. In this embodiment, the extension surface of the flat surface 20 along the axial direction of the rotating shaft 2 is opposite to the magnetic steel. Therefore, by setting the reference spacing body 140, the first filling slot 131 and the second filling slot 132 (the first filling slot 131 and the second filling slot 132 are located in the first direction toward which the flat surface 20 is facing) that are closest to the reference spacing body 140 are determined, and the first filling weight block 3 is respectively set in the first filling slot 131 and the second filling slot 132, so as to perform weighting corresponding to the position where the flat surface 20 is located. Specifically, the weights of the first weight blocks 3 in the first filling slot 131 and the second filling slot 132 are the same. Alternatively, in this embodiment, each first slot 13 located on the first injection molding body 110 is weighted separately, that is, the first weight blocks 3 are respectively set in the four first slots 13 on the first injection molding body 110, so that the weight added on the first injection molding body 110 is evenly distributed, and the dynamic unbalance of the rotor body 10 is reduced.

[0038] Furthermore, if Figure 4 As shown, the rotor body 10 includes a plurality of rotor cores 12, and the rotor assembly 1 also includes: a second slot body 16, which is arranged on the second end face 102, at least part of the rotor core 12 is opposite to the second slot body 16, and there are a plurality of second slot bodies 16, and the plurality of second slot bodies 16 are arranged one-to-one with the plurality of rotor cores 12; and a second supplementary weight block 4 is arranged in the second slot body 16. The second supplementary weight block 4 is arranged in the second slot body 16, so that the overall structure of the injection molding body 11 can be made more compact, and at the same time, during the injection molding process, the position of the mold for forming the second slot body 16 can be directly adjusted without adding a new filling structure to the mold. Preferably, the surface of the second supplementary weight block 4 and the second end face 102 are located in the same plane, so that the second supplementary weight block 4 is prevented from protruding relative to the second end face 102 during the assembly of the motor, and the second supplementary weight block 4 is prevented from interfering with other components in the motor.

[0039] In this embodiment, the plurality of second slots 16 include a third filling slot 161 and a fourth filling slot 162, and the projection surfaces of the third filling slot 161 and the fourth filling slot 162 on the first end surface 101 are arranged symmetrically with the center of the first filling slot 131 and the second filling slot 132; the third filling slot 161 and the fourth filling slot 162 are respectively provided with a second supplementary weight block 4. In this way, supplementary weight is provided on the second end surface 102, and supplementary weight is provided at a position symmetrical to the first filling slot 131 and the second filling slot 132, so that the mass distribution on both sides of the injection molding body 11 is uniform, and the weight on both sides of the injection molding body 11 is balanced.

[0040] In the second embodiment provided by the present application, the number of the rotor cores 12 is an even number, and the extension surface of the flat surface 20 along the axial direction is opposite to one of the first slots 13 among the plurality of first slots 13; and a first supplementary weight block 3 is respectively arranged in each first slot 13 on the first injection molded body 110. At this time, the cutting surface 100 is respectively opposite to each first slot 13 on the first injection molded body 110, and therefore, a first supplementary weight block 3 is respectively arranged in each first slot 13 to balance the dynamic unbalance amount generated by the flat surface 20. Preferably, the weight of the first supplementary weight block 3 in each first slot 13 is the same.

[0041] In the third embodiment provided in the present application, the number of the rotor cores 12 is an even number, the extension surface of the flat surface 20 along the axial direction is opposite to one of the first slot bodies 13 among the plurality of first slot bodies 13, and the cutting surface 100 equally divides the plurality of first slot bodies 13 into two parts, such as Figure 5 As shown, the cutting surface 100 is opposite to the five first slot bodies 13. At this time, according to actual needs, the weight is symmetrically supplemented along the center line of the first slot body 13, and the first supplementary weight block 3 is set in the first slot body 13 located in the middle position, or the first slot bodies 13 are alternately supplemented, that is, the first supplementary weight blocks 3 are respectively set in the first slot bodies 13 at both ends and the first slot body 13 in the middle, or the first supplementary weight blocks 3 are respectively set in the five first slot bodies 13, so as to balance the dynamic unbalance amount generated by the flat surface 20. Preferably, the weight of the first supplementary weight blocks 3 in each first slot body 13 is the same.

[0042] In this embodiment, the rotor body 10 includes a plurality of rotor cores 12, and the rotor assembly 1 further includes: a second slot body 16, which is arranged on the second end face 102, at least part of the rotor core 12 is opposite to the second slot body 16, there are a plurality of second slot bodies 16, and the plurality of second slot bodies 16 are arranged one-to-one with the plurality of rotor cores 12; at least two of the plurality of second slot bodies 16 on the second injection molded body 111 are respectively provided with a second supplementary weight block 4. According to actual needs, the second supplementary weight block 4 is arranged in at least two of the plurality of second slot bodies 16 to balance the weight of the first supplementary weight block 3 on the first end face 101.

[0043] In the specific implementation process, the thickness direction is the axial direction of the rotor body 10, and the thickness of the first supplementary weight block 3 is H1, 0mm

[0044] Taking the axis direction of the rotor body 10 as the thickness direction, the thickness of the second supplementary weight block 4 is H2, 0mm<H2≤30mm. Similarly, according to the actual weight requirement of the second supplementary weight block 4, the thickness of the second supplementary weight block 4 is adjusted, and the maximum thickness of the second supplementary weight block 4 is set to 30mm to avoid the second supplementary weight block 4 being too thick and protruding from the second end surface 102, causing interference with other assembly parts in the motor.

[0045] In the present application, the total weight of the first supplementary weight block 3 on the first end surface 101 is m 1 The total weight of the second weight block 4 on the second end surface 102 is m 2 ; Among them, r 1 is the distance from the center of mass of the flat surface 20 to the axis of the rotating shaft 2; L is the horizontal distance between the first end surface 101 and the second end surface 102; L 2 L is the horizontal distance between the centroid of the flat surface 20 and the second end surface 102; 1 is the horizontal distance between the center of mass of the flattened surface 20 and the first end face 101; m is the weight missing from the flattened surface 20 relative to the shaft 2 (the weight milled or turned off from the shaft 2 during the process of flattening the shaft 2 by a milling machine or a lathe); r is the vertical distance between the flattened surface 20 and the axis of the shaft 2. By using the above calculation formula, before adding weight, the total weight of the first end face 101 on the first injection molded body 110 is calculated, and the total weight of the second end face 102 on the second injection molded body 111 is calculated. Based on the calculation results, the thickness range of the first and second weight blocks 3 and 4, and the position corresponding to the flattened surface 20 (the position corresponding to the flattened surface 20 refers to the situation in the above-mentioned embodiments 1 to 3 where the plane where the flattened surface 20 is located along the axial direction is opposite to the first trough body 13 or opposite to the spacing body 14), when there are only one first weight block 3 and one second weight block 4, the weight of one first weight block 3 is m. 1 , the weight of a second weight block 4 is m 2 When the first weight block 3 is multiple and the second weight block 4 is multiple, the total weight of the multiple first weight blocks 3 is m 1 The total weight of the second weight blocks 4 is m 2 ​, the total weight is evenly distributed on the first supplementary weight blocks 3 of each first trough body 13, and on the second supplementary weight blocks 4 of each second trough body 16.

[0046] In the specific implementation process, the injection molding material is PA66 (polyhexamethylene adipamide), PA6 (polymer compound), PBT (polybutylene terephthalate) and glass fiber in different proportions.

[0047] The present application also provides a motor, comprising a rotor structure and a stator, wherein the rotor structure is the rotor structure of the above embodiment.

[0048] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

[0049] According to the rotor structure provided in the present application, it includes a rotor assembly 1 and a rotating shaft 2. The rotor assembly 1 includes a rotor body 10 and an injection molded body 11. The rotor body 10 includes a rotor core 12, a shaft sleeve and a permanent magnet. The rotor core 12, the shaft sleeve and the permanent magnet are integrally injection molded by injection molding to form an injection molded body 11 to improve the structural strength of the rotor body 10. The injection molded body 11 includes a first end face 101 and a second end face 102 that are relatively arranged along the axial direction of the rotor body 10. A first supplementary weight block 3 is arranged on the first end face 101, and a second supplementary weight block 4 is arranged on the second end face 102. The first supplementary weight block 3 and the second supplementary weight block 4 are respectively an integral injection molded structure with the injection molded body 11. After the rotor body 10 is injection molded, the two sides of the rotor body are directly supplemented with weight, and the first supplementary weight block 3 and the second supplementary weight block 4 are used to compensate for the dynamic imbalance caused by the rotating shaft 2. In addition, this arrangement can also save the dynamic balancing correction process of the rotor structure. Before injection molding, the weight required to be supplemented on both sides of the injection molding body 11 is calculated, and the corresponding weight of injection molding raw materials is directly added during the injection molding process. The dynamic imbalance of the rotor after injection molding is maintained within 500 mg, which simplifies the production process and saves labor costs.

[0050] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0051] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0052] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rotor structure, comprising a rotor assembly (1) and a rotating shaft (2), wherein the rotor assembly (1) is sleeved on the rotating shaft (2), and characterized in that: The rotor assembly (1) comprises: A rotor body (10) sleeved on the rotating shaft (2); An injection molded body (11) is coated on the rotor body (10), wherein the injection molded body (11) comprises a first end surface (101) and a second end surface (102) which are arranged opposite to each other along the axial direction of the rotor body (10); One or more first supplementary weight blocks (3) are arranged on the first end surface (101), and one or more second supplementary weight blocks (4) are arranged on the second end surface (102); the first supplementary weight blocks (3) and the second supplementary weight blocks (4) are an integrally molded structure with the injection molded body (11).

2. The rotor structure according to claim 1, characterized in that: The rotating shaft (2) has a flat surface (20), the flat surface (20) faces a first direction, and the flat surface (20) and the first end surface (101) are located on the same side of the rotor body (10); Taking the plane where the flat surface (20) is located as the dividing plane (100), the injection molded body (11) is divided into a first injection molded body (110) and a second injection molded body (111), the first injection molded body (110) is located in the first direction, the second injection molded body (111) is located in the second direction, the first direction is opposite to the second direction, at least a portion of the first end surface (101) is located on the first injection molded body (110), and at least a portion of the second end surface (102) is located on the second injection molded body (111); The first additional weight block (3) is located on the first injection-molded body (110), and the second additional weight block (4) is located on the second injection-molded body (111).

3. The rotor structure according to claim 2, characterized in that: The rotor body (10) comprises a plurality of rotor cores (12), and the rotor assembly (1) further comprises: A first slot body (13) is arranged on the first end surface (101), at least a portion of the rotor core (12) is opposite to the first slot body (13), there are a plurality of first slot bodies (13), and the plurality of first slot bodies (13) are arranged in one-to-one correspondence with the plurality of rotor cores (12); The first supplementary weight block (3) is arranged in the first slot body (13).

4. The rotor structure according to claim 3, characterized in that: A spacing body (14) is arranged between two adjacent first slot bodies (13), the spacing body (14) is opposite to the magnetic steel of the rotor body (10), there are a plurality of spacing bodies (14), and the plurality of spacing bodies (14) are arranged in one-to-one correspondence with the plurality of magnetic steels; The plurality of spacing bodies (14) include a reference spacing body (140), wherein the orthographic projection surface of the reference spacing body (140) along the radial direction of the rotor body (10) is located on the extension surface of the flat surface (20) along the axial direction; The plurality of first slot bodies (13) include a first filling slot body (131) and a second filling slot body (132); the reference spacing body (140) is located between the first filling slot body (131) and the second filling slot body (132); and the first filling weight block (3) is respectively arranged in the first filling slot body (131) and the second filling slot body (132).

5. The rotor structure according to claim 3, characterized in that: An extension surface of the flat surface (20) along the axial direction of the rotating shaft (2) is opposite to one of the first groove bodies (13) among the plurality of first groove bodies (13); The first supplementary weight block (3) is respectively arranged in each of the first grooves (13) on the first injection-molded body (110).

6. The rotor structure according to claim 3, characterized in that: Taking the axial direction of the rotor body (10) as the thickness direction, the thickness of the first supplementary weight block (3) is H1, 0mm<H1≤30mm.

7. The rotor structure according to claim 4, characterized in that: The rotor body (10) comprises a plurality of rotor cores (12), and the rotor assembly (1) further comprises: A second slot body (16) is arranged on the second end surface (102), at least a portion of the rotor core (12) is opposite to the second slot body (16), there are a plurality of second slot bodies (16), and the plurality of second slot bodies (16) are arranged in one-to-one correspondence with the plurality of rotor cores (12); The second supplementary weight block (4) is arranged in the second slot body (16).

8. The rotor structure according to claim 7, characterized in that: The plurality of second slot bodies (16) include a third filling slot body (161) and a fourth filling slot body (162), and the projection surfaces of the third filling slot body (161) and the fourth filling slot body (162) on the first end surface (101) are arranged symmetrically with respect to the center of the first filling slot body (131) and the second filling slot body (132); The third filling tank (161) and the fourth filling tank (162) are respectively provided with a second supplementary weight block (4).

9. The rotor structure according to claim 5, characterized in that: The rotor body (10) comprises a plurality of rotor cores (12), and the rotor assembly (1) further comprises: A second slot body (16) is arranged on the second end surface (102), at least a portion of the rotor core (12) is opposite to the second slot body (16), there are a plurality of second slot bodies (16), and the plurality of second slot bodies (16) are arranged in one-to-one correspondence with the plurality of rotor cores (12); The second weight blocks (4) are respectively arranged in at least two of the second trough bodies (16) among the plurality of second trough bodies (16) on the second injection-molded body (111).

10. The rotor structure according to claim 9, characterized in that: Taking the axial direction of the rotor body (10) as the thickness direction, the thickness of the second supplementary weight block (4) is H2, 0mm<H2≤30mm.

11. The rotor structure according to claim 2, characterized in that: The total weight of the first supplementary weight block (3) on the first end surface (101) is m1, and the total weight of the second supplementary weight block (4) on the second end surface (102) is m2; Wherein, r1 is the distance from the center of mass of the flat surface (20) to the center of the axis of the rotation axis (2); L is the horizontal distance between the first end surface (101) and the second end surface (102); L2 is the horizontal distance between the centroid of the flat surface (20) and the second end surface (102); L1 is the horizontal distance between the centroid of the flat surface (20) and the first end surface (101); m is the weight missing from the flat surface (20) relative to the rotating shaft (2); r is the vertical distance between the flat surface (20) and the axis of the rotating shaft (2).

12. A motor comprising a rotor structure and a stator, characterized in that: The rotor structure is the rotor structure according to any one of claims 1 to 11.

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