Rotor core and motor rotor

Abstract

A rotor iron core and a motor rotor, comprising: an iron core assembly, the iron core assembly being provided with a mounting groove extending along an axis direction, the mounting groove being used for inserting a permanent magnet; wherein the at least two iron core assemblies are used for being spliced and fixed in the axis direction, and blocking pieces are arranged at the outer ends of the mounting grooves of the iron core assemblies located at the two ends, so that the permanent magnets are limited in the mounting grooves between the blocking pieces at the two ends. The rotor core is formed by stacking and fixing the at least two iron core assemblies, the permanent magnets are inserted into the mounting grooves of the iron core assemblies, and the movement of the permanent magnets is limited through the blocking pieces at the two ends, so that magnetic steel glue is not needed for bonding, the curing time required for using the magnetic steel glue is saved, and the manufacturing efficiency of the rotor core is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor field, concretely relates to a rotor core and motor rotor. BACKGROUND

[0002] In the related art, the rotor core of the motor mostly adopts the integral structure, generally, a receiving groove is formed on the core, an opening is arranged at one end of the receiving groove, and a baffle is arranged at the other end for positioning, and the magnetic steel sheet is inserted into the receiving groove from the opening. In order to maintain the fixed connection between the magnetic steel sheet and the core, prevent the magnetic steel sheet from being separated from the core in the high-speed motion state of the rotor, it is usually necessary to use magnetic steel glue to bond the magnetic steel sheet and the core, and the curing time of the magnetic steel glue is long, which leads to complex assembly process of the rotor and low efficiency. SUMMARY

[0003] The utility model mainly solves the technical problems that the rotor of the motor needs to use magnetic steel glue to bond the magnetic steel and the core in the related art, which leads to complex assembly process of the rotor and low efficiency.

[0004] In one embodiment, a rotor core is provided, comprising: at least two core assemblies, the communication assembly is formed with a mounting groove extending along the axial direction, the mounting groove is used for inserting a permanent magnet; wherein the at least two core assemblies are used for splicing and fixing along the axial direction, and the outer end of the mounting groove of the core assembly at both ends is provided with a blocking piece to limit the permanent magnet in the mounting groove between the blocking pieces at both ends.

[0005] In one embodiment, the mounting grooves of the two adjacent core assemblies correspond in position and are in communication with each other, for the permanent magnet to pass through the mounting grooves of the adjacent core assemblies; or, for the permanent magnet corresponding to one side of the core assembly to abut against the permanent magnet corresponding to the other side of the core assembly.

[0006] In one embodiment, the mounting grooves of the two adjacent core assemblies are staggered by a preset angle in the axial direction, so that at least one end of the permanent magnet corresponding to one side of the core assembly abuts against the end face of the core assembly on the other side.

[0007] In one embodiment, the blocking piece and the core assembly are integrally formed.

[0008] In one embodiment, the at least two blocking pieces include elastic piece members, one end of the elastic piece members is fixedly connected with the core assembly, and the other end is used for abutting against the permanent magnet; the minimum distance between the two elastic piece members is less than the sum of the sizes of the corresponding permanent magnets in the corresponding direction.

[0009] In one embodiment, the elastic piece comprises a connecting portion and an elastic portion; the connecting portion is located at one end of the mounting slot and connected with the core assembly; the elastic portion is connected with the connecting portion at one end and bent towards the inside of the mounting slot at the other end and used for abutting against the permanent magnet.

[0010] In one embodiment, the sum of the sizes of the permanent magnets corresponding to the rotor core in the axial direction is greater than or equal to the sum of the sizes of the mounting slots corresponding to the rotor core in the axial direction.

[0011] In one embodiment, the blocking piece has a through hole opened in the axial direction.

[0012] In one embodiment, the shapes, sizes and setting positions of the core assemblies are the same respectively.

[0013] In one embodiment, a motor rotor is also provided, comprising a rotating shaft and the rotor core and the permanent magnet inserted into the mounting slot; the rotating shaft sequentially penetrates the core assemblies along the axial direction of the rotor core and is fixedly connected with the core assemblies.

[0014] According to the rotor core and the motor rotor of the above-mentioned embodiments, since the rotor core is formed by stacking and fixing at least two core assemblies, and the permanent magnet is inserted into the mounting slot of the core assembly and is limited from moving by the blocking pieces at both ends, the rotor core does not need to be bonded by magnetic steel glue, the curing time required by the magnetic steel glue is saved, and the manufacturing efficiency of the rotor core is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic diagram of the rotor core structure in the embodiments of the present application.

[0016] Figure 2 It is an explosion schematic diagram of the rotor core in the embodiments of the present application.

[0017] Figure 3 It is a schematic diagram of the motor rotor structure in the embodiments of the present application.

[0018] Figure 4 It is a schematic diagram of the motor rotor cross section in the embodiments of the present application.

[0019] Figure 5 It is a schematic diagram of the mounting slot misalignment of the rotor core in the embodiments of the present application.

[0020] Figure 6 It is another schematic diagram of the motor rotor cross section in the embodiments of the present application.

[0021] Figure 7 It is Figure 6 It is a schematic diagram of the partial A in the embodiments of the present application.

[0022] Explanation of reference signs:

[0023] 1 - rotor core; 10 - core assembly; 11 - mounting groove; 12 - blocking piece; 13 - elastic piece; 14 - connecting part; 15 - elastic part;

[0024] 2 - permanent magnet; 21 - magnetic steel sheet;

[0025] 3 - rotating shaft. DETAILED DESCRIPTION

[0026] The utility model will be further described in detail below by means of specific embodiments in connection with the drawings. In different embodiments, similar elements are provided with similar element reference numbers. In the following embodiments, many details are described in order to make the present application better understood. However, those skilled in the art can easily realize that some features can be omitted in different cases or replaced by other elements, materials or methods. In some cases, some operations related to the present application are not shown or described in the specification in order to avoid the core part of the present application from being overwhelmed by too much description, and it is not necessary to describe these related operations in detail for those skilled in the art, who can fully understand the related operations according to the description in the specification and general technical knowledge in the art.

[0027] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate way to form various embodiments. At the same time, the steps or actions in the method description can also be sequentially adjusted or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and drawings are only for the purpose of clearly describing a certain embodiment, and do not mean that the sequence is necessary, unless otherwise stated that a certain sequence must be followed.

[0028] The serial numbers of components in this paper, such as "first", "second", etc., are only used to distinguish the described objects, and do not have any sequence or technical meaning. Unless otherwise specified, the "connection" and "coupling" in this application include direct and indirect connection (coupling).

[0029] In order to improve the process efficiency of the motor rotor and save the curing time required for using magnetic steel glue, an embodiment of the present application provides a rotor core, please refer to Figure 1 and Figure 2 The rotor core comprises:

[0030] At least two iron core assemblies 10 are formed with mounting slots 11 extending along the axial direction, the mounting slots 11 being used for inserting the permanent magnets 2; wherein the at least two iron core assemblies 10 are used for being spliced and fixed along the axial direction, and the outer ends of the mounting slots 11 of the iron core assemblies 10 at both ends are provided with blocking pieces 12, so as to limit the permanent magnets 2 in the mounting slots 11 between the blocking pieces at both ends.

[0031] Please refer to Figure 3 The rotor iron core in the embodiment of the present application is used as the iron core of the rotor, which can be connected with the rotating shaft 3, the rotating shaft 3 being inserted into the rotor iron core along the axial direction, and the center of the rotor iron core is provided with a through hole matched with the rotating shaft 3.

[0032] In order to mount the permanent magnets 2, the rotor iron core 1 is provided with mounting slots 11, i.e. used for accommodating the permanent magnets 2. Due to the provision of the mounting slots 11, the permanent magnets 2 can be inserted into the mounting slots 11.

[0033] In the related art, in order to ensure the stable connection relationship between the permanent magnets 2 and the rotor iron core 1, it is usually necessary to set a magnetic steel glue between the permanent magnets 2 and the rotor iron core 1 to bond the two; the curing time of the magnetic steel glue is long, which leads to a long production time of the rotor iron core; in order to solve this problem, please refer to Figure 4 The rotor iron core 1 in the embodiment of the present application includes at least two iron core assemblies 10, and each iron core assembly 10 is arranged in a stacked manner along the axial direction, so as to present a stacked form; each iron core assembly 10 is provided with a mounting slot 11, and when the permanent magnets 2 are assembled, the permanent magnets 2 can be arranged in the corresponding mounting slots 11 of each iron core assembly 10. In order to prevent the permanent magnets 2 from separating from the rotor iron core 1, the rotor iron core 1 is provided with blocking pieces 12 opposite to the mounting slots 11 at both ends in the axial direction, which can prevent the permanent magnets 2 in the mounting slots 11 from separating from the mounting slots 11. Therefore, when assembling, the iron core assemblies 10 can be separated from each other in advance, and after the permanent magnets 2 are filled into the mounting slots 11, the iron core assemblies 10 are fixedly connected, so as to form a state that the permanent magnets 2 are encapsulated in the rotor iron core 1. In this structure, the operation of bonding the permanent magnets 2 and the iron core assemblies 10 by the magnetic steel glue can be omitted, so that the process of curing the magnetic steel glue is omitted, and the assembly efficiency of the rotor iron core is improved.

[0034] The number of the iron core assemblies 10 is greater than or equal to 2. If the number of the iron core assemblies 10 is 2, the mounting slots 11 of the two iron core assemblies 10 are respectively provided with openings at the end faces close to each other, and the end faces of the two iron core assemblies 10 far away from each other are provided with the blocking pieces 12, so as to limit the permanent magnets 2 in the mounting slots 11 and prevent the permanent magnets 2 from being separated. If the number of the iron core assemblies 10 is 3 or more, the mounting slot 11 corresponding to the middle iron core assembly 10 can be a through structure at both ends, that is, the permanent magnet 2 can be inserted into the mounting slot 11 at both ends of the corresponding iron core assembly 10 along the axial direction, so that the mounting slots 11 on the adjacent iron core assemblies 10 are communicated with each other, and the permanent magnets 2 accommodated can pass through the iron core assemblies 10. The outer ends of the iron core assemblies 10 at both ends of the stacked arrangement are provided with the blocking pieces 12 to prevent the permanent magnets 2 from being separated.

[0035] In the embodiment of the present application, the permanent magnet 2 in the rotor core 1 can be a whole magnetic steel alone or formed by a plurality of magnetic steels abutting against each other. In some optional embodiments, the mounting slots 11 of the two adjacent iron core assemblies 10 are located correspondingly and communicated with each other, and can be used for the permanent magnet 2 to pass through the mounting slots 11 of the adjacent iron core assemblies 10; or, the permanent magnet 2 corresponding to one side iron core assembly 10 abuts against the permanent magnet 2 corresponding to the other side iron core assembly 10. It can be understood that when the permanent magnet 2 in the rotor core 1 is provided as one, the permanent magnet 2 passes through a plurality of iron core assemblies 10 and abuts against the blocking pieces 12 at both ends respectively to be fixed. When the permanent magnet 2 in the rotor core 1 is provided as a plurality of permanent magnets, for example, one permanent magnet 2 is provided corresponding to each iron core assembly 10, the permanent magnet 2 corresponding to one side iron core assembly 10 abuts against the permanent magnet 2 corresponding to the other side iron core assembly 10, and the outer ends of the permanent magnets 2 corresponding to the iron core assemblies 10 at both ends abut against the blocking pieces 12 at both ends respectively to be fixed.

[0036] In some optional embodiments, the mounting slots 11 of the two adjacent iron core assemblies 10 are circumferentially staggered by a preset angle, so that at least one end of the permanent magnet 3 corresponding to one side iron core assembly 10 abuts against the end face of the other side iron core assembly 10. In this structure, the permanent magnet 3 can be clamped and fixed by the end faces of the adjacent iron core assemblies 10 to improve the fastening property, and the oblique pole effect can also be achieved. Please refer to Figure 5 .

[0037] In some optional embodiments, in order to improve the connection strength between the blocking piece 12 and the iron core assembly 10, the blocking piece 12 and the iron core assembly 10 are integrally formed. The iron core assembly 10 and the blocking piece 12 can be integrally formed by processes such as die casting and cutting.

[0038] In some optional embodiments, please refer to Figure 6 and Figure 7In order to offset the axial gap and prevent the permanent magnet 2 from moving in the mounting groove 11, the blocking piece 12 can specifically include a spring piece 13, one end of the spring piece 13 is fixedly connected with the core assembly 10, and the other end is used for abutting against the permanent magnet 3; the minimum distance between the two spring pieces 13 is less than the sum of the sizes of the permanent magnet 2 in the corresponding direction. By elastically abutting against the permanent magnet 2 through the spring piece 13, the axial gap of the permanent magnet 2 can be offset, and the permanent magnet 2 can be prevented from moving in the mounting groove 11.

[0039] In some optional embodiments, in order to enable the spring piece 13 to form elastic contact with the permanent magnet 2, the spring piece 13 can specifically include a connecting portion 14 and an elastic portion 15; the connecting portion 14 is located at one end of the mounting groove 11 and is connected with the core assembly 10; one end of the elastic portion 15 is connected to the connecting portion 14, and the other end is bent inwardly of the mounting groove 11 and is used for abutting against the permanent magnet 3. When the elastic portion 15 is bent in only one direction, the spring piece 13 as a whole is in a U shape or an inverted U shape, or the elastic portion 15 can be bent multiple times, thereby forming a wave-shaped elastic portion 15. The specific bending mode can be determined according to the required elastic pre-tightening force, the size of the permanent magnet 2 and other factors. Among the blocking pieces 12 at the two ends of the rotor core 1 in the axial direction, at least one of them can be the spring piece 13; or the blocking pieces 12 at the two ends of the rotor core 1 in the axial direction can both be the spring piece 13. That is, the spring piece 13 can be arranged at only one end of the rotor core 1 or at both ends of the rotor core 1.

[0040] In some optional embodiments, in order to prevent the axial gap, the sum of the sizes of the corresponding permanent magnets 2 of the rotor core 1 in the axial direction can be configured to be greater than or equal to the sum of the sizes of the corresponding mounting grooves 11 of the rotor core 1 in the axial direction. In this way, when the rotor core 1 is connected together with the permanent magnets 2, the permanent magnets 2 can be tightly clamped by the blocking pieces 12 at the two ends of the rotor core 1, thereby effectively preventing the axial gap. According to the composition structure of the permanent magnet 2, when the permanent magnet 2 is formed by two or more magnetic steel sheets 21 abutting against each other, the sum of the sizes of the permanent magnet 2 in the axial direction refers to the sum of the sizes of the magnetic steel sheets 21 in the axial direction, and the same applies to the mounting groove 11.

[0041] In some optional embodiments, the number of the mounting grooves 11 formed by the core assembly 10 is three or more, and the mounting grooves 11 on the core assembly 10 are symmetrically distributed in the circumferential direction of the core assembly 10. The mounting grooves 11 on each core assembly 10 enclose a ring shape, and after the permanent magnets 2 are inserted, the permanent magnets 2 also enclose a ring shape. For example, Figure 1 and Figure 2 The structure of the core assembly 10 provided with 10 ring-shaped mounting grooves 11 is shown in the above two figures.

[0042] In some optional embodiments, in order to facilitate observation of the use state of the permanent magnet 2 and facilitate assembly of the permanent magnet 2, the blocking piece 12 has a through hole opened along the axial direction. The through hole can allow the permanent magnet 3 located in the mounting groove 11 to be exposed, and the state of the permanent magnet 2 in the mounting groove 11 can be observed through the through hole while ensuring that the blocking piece 12 limits the permanent magnet 2. For the mounting groove 11, as long as the inside can accommodate the permanent magnet 2, the corresponding mounting groove can be provided with a through hole at both ends.

[0043] In some optional embodiments, the permanent magnet 2 can be provided as a magnetic steel sheet 21.

[0044] In some optional embodiments, the shape, size and setting position of the corresponding mounting groove 11 of each iron core assembly 10 are respectively the same. In other words, the structures of the iron core assemblies 10 are respectively the same; in this case, the same mold can be used for manufacturing, thereby improving manufacturing efficiency and reducing production cost.

[0045] The rotor iron core in the embodiment of the application is formed by stacking and fixing at least two iron core assemblies 10, and the permanent magnet 2 is inserted into the mounting groove 11 of the iron core assembly 10 and limited from moving by the blocking piece 12 at both ends of the rotor iron core 1, thereby not needing to be bonded by magnetic steel glue, saving the curing time required for using the magnetic steel glue and improving the manufacturing efficiency of the rotor iron core.

[0046] In addition, the embodiment of the application also provides a motor rotor, as shown in Figure 3 to Figure 6 The rotor iron core 1 in the embodiment of the application and the permanent magnet 3 inserted into the mounting groove 11; the shaft 3 sequentially penetrates the iron core assemblies 10 along the axial direction of the rotor iron core 1 and is fixedly connected with the iron core assemblies 10.

[0047] The above application of specific examples to the utility model is described, which is only used to help understand the utility model and does not limit the utility model. For the skilled in the art to which the utility model belongs, according to the idea of the utility model, a number of simple deductions, deformations or substitutions can be made.

Claims

1. A rotor core characterized by, The application relates to a rotor core. The installation grooves of two adjacent iron core components are in position correspondence and mutual communication, and the permanent magnets are arranged in the installation grooves of the adjacent iron core components; or the permanent magnets corresponding to one side of the iron core components abut against the permanent magnets corresponding to the other side of the iron core components.

2. The rotor core of claim 1, wherein The installation grooves of two adjacent iron core components are staggered by a preset angle in the circumferential direction, so that at least one end of the permanent magnet corresponding to one side of the iron core components abuts against the end surface of the iron core component on the other side.

3. The rotor core of claim 1, wherein The blocking piece and the iron core component are integrally formed.

4. The rotor core of claim 1, wherein The blocking piece comprises elastic piece parts, one end of the elastic piece parts is fixedly connected with the iron core component, and the other end is used for abutting against the permanent magnet; the minimum distance between the two elastic piece parts is smaller than the sum of the sizes of the corresponding permanent magnets in the corresponding direction.

5. The rotor core of claim 1, wherein The elastic piece part comprises a connecting part and an elastic part; the connecting part is located at one end of the installation groove and is connected with the iron core component; one end of the elastic part is connected with the connecting part, and the other end is bent towards the inside of the installation groove and is used for abutting against the permanent magnet.

6. The rotor core of claim 5, wherein The sum of the sizes of the permanent magnets corresponding to the rotor core in the axial direction is greater than or equal to the sum of the sizes of the installation grooves corresponding to the rotor core in the axial direction.

7. The rotor core of claim 1, wherein The blocking piece has a through hole which is opened in the axial direction.

8. The rotor core according to any one of claims 1 to 7, characterized in that, The shapes, sizes and setting positions of the installation grooves corresponding to the iron core components are respectively the same.

9. The rotor core according to any one of claims 1 to 7, characterized in that, The application relates to a rotor core.

10. An electric machine rotor, characterized in that The rotor shaft sequentially penetrates the iron core components along the axial direction of the rotor core and is fixedly connected with the iron core components.

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