Rotor assembly and motor

Abstract

The utility model discloses a rotor assembly and a motor, and relates to the motor technology field, the rotor assembly comprises an inner iron core, an outer iron core, a plurality of first filling members arranged between the inner iron core and the outer iron core, and a plurality of magnetic steels arranged on the outer side of the outer iron core, the plurality of first filling members are arranged between the outer iron core and the inner iron core, and the plurality of magnetic steels are arranged on the outer side of the outer iron core. The multiple first filling pieces are connected with the inner iron core and the outer iron core, and the multiple first filling pieces are arranged in the circumferential direction of the outer wall of the inner iron core at intervals. The technical scheme provided by the utility model aims to solve the problem that the inner iron core and the outer iron core which are wrapped by plastics are easy to crack at the position of an injection welding surface under environmental tests such as thermal shock and the like.

Description

Technical Field

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

[0002] Currently, the rotor assembly of the motor uses an inner iron core and an outer iron core and is connected by wrapping with plastic material injection molding. When using this type of rotor assembly during environmental testing, such as hot and cold shock testing, the plastic coating structure of the rotor assembly is prone to breakage, causing the motor to make noise or the rotor to get stuck. Increasing the injection molding material or amount will lead to increased motor costs. Figure 1 It is a schematic diagram of the structure of the filler formed by continuous injection molding between the inner core and the outer core. Figure 1 The dotted line indicated by the double arrows is the welding surface (the welding surface is formed by the flow and convergence of the filling parts, and the convergent surfaces have different temperatures and are often not completely fused). Under environmental tests such as hot and cold shock tests, the welding surface is prone to cracking. Utility Model Content

[0003] The main purpose of the utility model is to provide a rotor assembly and a motor, aiming to solve the problem that the inner iron core and the outer iron core wrapped in plastic are prone to cracking at the injection molding welding surface under environmental tests such as cold and hot shock.

[0004] To achieve the above-mentioned purpose, the rotor assembly proposed by the utility model comprises:

[0005] Inner iron core;

[0006] An outer iron core; the outer iron core is sleeved with the inner iron core;

[0007] A plurality of magnetic steels, wherein the plurality of magnetic steels are circumferentially arranged on the outer side of the outer core; and

[0008] A plurality of first filling pieces are provided between the outer core and the inner core, the plurality of first filling pieces connect the inner core and the outer core, and the plurality of first filling pieces are arranged at intervals along the circumferential direction of the outer wall of the inner core.

[0009] In one embodiment, the plurality of first filling pieces define a plurality of partition grooves along the circumferential direction between the inner core and the outer core.

[0010] In one embodiment, the plurality of partitions are evenly spaced and distributed.

[0011] In one embodiment, the inner wall of the outer core is provided with a plurality of inner protrusions at intervals along the circumferential direction, and the outer wall of the inner core is provided with a corresponding number of outer concave portions corresponding to the inner protrusions, the inner protrusions and the outer concave portions correspond to each other, and the first filling piece covers the inner protrusions and fills the gap between the inner protrusions and the outer concave portions.

[0012] In one embodiment, two opposite sides of the inner convex portion in the circumferential direction are both recessed inward to form two limiting grooves respectively, and two ends of the first filling piece are respectively placed in the two limiting grooves.

[0013] In one embodiment, the side wall of the limiting groove is curved in an arc shape.

[0014] In one embodiment, a cross-sectional diagram of a cross section of the first filling member perpendicular to the axial direction is C-shaped.

[0015] In one embodiment, the inner convex portion and the outer concave portion both extend axially to both ends of the inner core and the outer core.

[0016] In one embodiment, an injection port is provided on the inner convex portion.

[0017] In one embodiment, the rotor assembly further includes a second filling piece, and the plurality of magnetic steels are disposed on the outer side of the outer core through the second filling piece.

[0018] In one embodiment, the second filling piece includes a plurality of limiting portions that surround the upper end and the lower end of the outer iron core, protrude from the outer surface of the outer iron core, and connect the upper end and the lower end, the plurality of limiting portions are distributed at intervals along the circumferential direction, and the plurality of limiting portions form a plurality of accommodating cavities, and one of the magnetic steels is disposed in one of the accommodating cavities.

[0019] In one embodiment, the upper end portion and / or the lower end portion is provided with a plurality of groups of positioning holes for inserting positioning pins for positioning the magnetic steel, and one group of the positioning holes is communicated with one of the accommodating cavities.

[0020] In one embodiment, the first filling piece and the second filling piece are integrally formed.

[0021] In one embodiment, the first filling piece extends in the axial direction and is formed with an embedding groove on a side close to the inner core, and the inner core is disposed in the embedding groove.

[0022] In one embodiment, the first filling piece covers the outer core.

[0023] The utility model also provides a motor, comprising the rotor assembly as described above.

[0024] The technical solution of the utility model firstly adopts a separate design by arranging a plurality of first filling pieces at intervals between the inner core and the outer core, thereby eliminating the welding surface between the integral injection-molded parts that wrap the inner core in the related technology, thereby solving the problem that the welding surface is prone to fracture in hot and cold shock experiments; secondly, the manner of arranging a plurality of first filling pieces at intervals reduces the amount of filling material used, further reducing the cost; in this way, the bonding strength of the inner / outer core is guaranteed, and the purpose of low cost and high reliability is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of the welding surface of the rotor injection molded part in the related art;

[0027] Figure 2 A schematic structural diagram of an embodiment of a rotor mobile phone provided by the utility model;

[0028] Figure 3 for Figure 2 Schematic diagram of the structure in which the filling piece is removed;

[0029] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure perpendicular to the axial direction;

[0030] Figure 5 for Figure 2 Schematic diagram of the cross-sectional structure perpendicular to the radial direction.

[0031] Description of Figure Numbers:

[0032] 100, rotor assembly; 110, partition groove; 120, arc-shaped curved surface; 200, inner iron core; 210, outer concave portion; 300, outer iron core; 310, inner convex portion; 311, limiting groove; 312, arc-shaped bend; 320, positioning boss; 330, glue injection port; 400, magnetic steel; 500, first filling piece; 510, embedded groove; 600, second filling piece; 610, upper end portion; 620, lower end portion; 630, limiting portion; 640, accommodating cavity.

[0033] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0037] Currently, the rotor assembly of the motor uses an inner iron core and an outer iron core and is connected by wrapping with plastic material injection molding. When using this type of rotor assembly during environmental testing, such as hot and cold shock testing, the plastic coating structure of the rotor assembly is prone to breakage, causing the motor to make noise or the rotor to get stuck. Increasing the injection molding material or amount will lead to increased motor costs.

[0038] Figure 1 It is a structural diagram of the filling piece formed by continuous injection molding between the inner core and the outer core. The dotted line indicated by the double arrows in the figure is the welding surface (the welding surface is formed by the flow of plastic, and the convergent surface temperature is different and often not completely fused). Under environmental tests such as hot and cold shock tests, the welding surface is prone to cracking, causing the magnetic steel to fall off.

[0039] To this end, the utility model provides a rotor assembly, aiming to solve the problem that the inner iron core and the outer iron core wrapped in plastic are prone to cracking at the injection molding welding surface under environmental tests such as cold and hot shock.

[0040] See also Figures 2 to 4 In one embodiment of the utility model, the rotor assembly 100 includes an inner core 200, an outer core 300 sleeved on the inner core 200, a plurality of first filling pieces 500 arranged between the inner core 200 and the outer core 300, and a plurality of magnetic steels 400 arranged on the outer side of the outer core 300 along the circumferential direction. The plurality of magnetic steels 400 can be integrally coated on the outer side of the outer core 300 by injection molding; or can be fixed on the outer side of the outer core 300 by gluing. In one embodiment, there are two first filling pieces 500, and the two first filling pieces 500 are symmetrically arranged between the inner core 200 and the outer core 300; in one embodiment, there are three first filling pieces 500, and the three first filling pieces 500 are arranged between the inner core 200 and the outer core 300; in other embodiments, the number of the first filling pieces 500 can also be five, six or even more; in order to have a higher cost-effectiveness, that is, a lower cost and a relatively better performance, in this embodiment, there are four first filling pieces 500, and the four first filling pieces 500 are arranged between the inner core 200 and the outer core 300. The filling pieces 500 are evenly spaced along the circumferential direction, and an interval injection molding process is used between the inner core 200 and the outer core 300 of the rotor assembly 100 to form a non-continuous injection molding layer. This design makes the injection molding layer intermittently distributed between the inner core 200 and the outer core 300, rather than completely covering or forming a continuous whole, that is, multiple first filling pieces 500 are spaced between the inner core 200 and the outer core 300, and it is not limited whether the first filling pieces 500 are connected at the upper end surface or the lower end surface of the inner core 200 and the outer core 300.

[0041] It should be noted that the discontinuous injection molding layer does not mean that the first filling piece 500 is discontinuous, but is connected by multiple independent injection molding areas. Each first filling piece 500 is an independent injection molding area, and there are gaps or uninjected parts between these injection molding areas.

[0042] The technical solution of the utility model firstly adopts a separate design by arranging a plurality of first filling pieces 500 at intervals between the inner core 200 and the outer core 300, thereby eliminating the welding surface between the integral injection-molded parts that wrap the inner core 200 in the related technology, thereby solving the problem that the welding surface is prone to fracture in hot and cold shock experiments; secondly, the manner of arranging a plurality of first filling pieces 500 at intervals reduces the amount of filling material used, further reducing the cost; in this way, the bonding force of the inner / outer core 300 is guaranteed, and the purpose of low cost and high reliability is achieved.

[0043] See also Figures 2 to 4, taking the scheme of four first fillers 500 as an example, the filler material used for the filler is not limited, and plastic material is usually used; if the motor needs to have buffering and vibration reduction capabilities, rubber can be used as the filler. The first filler 500 can be injection molded separately or as a whole; that is, in some schemes, the materials of multiple first fillers 500 can be different, which can improve design flexibility on the one hand, by using multiple materials in the same product, each material can be injection molded in a specific area according to its characteristics; on the other hand, it can improve product performance by adding additional material layers in key areas of the product to improve its strength, heat resistance or other physical properties.

[0044] In one embodiment, four first filling pieces 500 define a plurality of slots 110 along the circumferential direction between the inner core 200 and the outer core 300. The plurality of slots 110 are evenly spaced apart. A continuous annular gap is defined between the inner core 200 and the outer core 300. The plurality of first filling pieces 500 disposed in the annular gap separate the annular gap to form a plurality of slots 110. The plurality of slots 110 are evenly distributed, i.e., the annular gap is divided into four equal parts, and the lengths of adjacent slots 110 are equal. This ensures the bonding force of the rotor assembly 100.

[0045] In other embodiments, two adjacent first fillers 500 are arranged at intervals, but there is a non-gap interval between the two adjacent first fillers 500. For example, the two adjacent first fillers 500 may be partially separated by the inner core 200, or the two adjacent first fillers 500 may be partially separated by the outer core 300.

[0046] Reference Figure 4 During the rotation of the rotor assembly 100, the inner core 200 and the outer core 300 transmit force through the first filler 500. For stable combination, the ratio of the circumferential length of the first filler 500 to the circumferential length of the slot 110 is greater than or equal to 1 / 2 and less than or equal to 1. In this embodiment, the ratio of the circumferential length of the first filler 500 to the circumferential length of the slot 110 is about 2 / 3, so that the combination force of the inner / outer core 300 is guaranteed and the purpose of low cost and high reliability is achieved.

[0047] To achieve more sufficient force transmission and improve the service life of the rotor assembly 100 composed of the inner iron core 200 and the outer iron core 300, a plurality of inner convex portions 310 are circumferentially and spacedly protruded on the inner wall of the outer iron core 300, and a corresponding number of outer concave portions 210 are provided on the outer wall of the inner iron core 200 corresponding to the inner convex portions 310. The inner convex portions 310 and the outer concave portions 210 correspond to each other. The first filling member 500 covers the inner convex portions 310 and fills the gap between the inner convex portions 310 and the outer concave portions 210. A shaft hole is provided in the middle of the inner iron core 200. During rotation, the inner iron core 200 is driven to rotate. The side wall of the outer concave portion 210 presses against the first filling member 500, and the first filling member 500 then presses against the outer wall of the inner convex portion 310, thereby driving the outer iron core 300 to rotate. Compared with pulling the outer iron core 300 through the first filling member 500, the force transmission effect is better; the efficiency of the rotor assembly 100 is higher.

[0048] To facilitate placement in the mold during injection molding and ensure the processing process, a positioning boss 320 is further provided on the inner wall of the outer iron core. The positioning boss 320 extends axially. In one embodiment, the positioning boss 320 is provided in one of the partition grooves. In other embodiments, the positioning boss 320 is provided in two opposite partition grooves.

[0049] Four first filling members 500 define a plurality of partition grooves 110 circumferentially between the inner iron core 200 and the outer iron core 300. The evenly distributed partition grooves 110 make the forces on the inner iron core 200 and the outer iron core 300 in the circumferential direction uniform. The cross-sectional shape of the partition grooves 110 in the axial cross-section is a fan shape. The fan shape is equivalent to the shape of the fan part after the fan is unfolded, with an arc shape at the top and bottom and straight lines on both sides, which not only ensures the bonding force between the inner / outer iron cores 300 but also achieves the purpose of low cost and high reliability.

[0050] To make the combination of the first filling member 500 and the inner convex portion 310 more reliable, the opposite sides of the inner convex portion 310 in the circumferential direction are both recessed inward to respectively form two limiting grooves 311. The two ends of the first filling member 500 are respectively placed in the two limiting grooves 311. The cross-sectional shape of the first filling member 500 in the axial cross-section is a C shape, and the two ends of the C shape are embedded in the limiting grooves 311. The C-shaped design of the inner convex portion 310 of the inner iron core 200 and the first filling member 500 are mutually engaged to prevent relative slip or separation between the two when subjected to external forces, thereby enhancing the structural stability.

[0051] In other embodiments, the cross-sectional shape of the first filling member 500 in the axial cross-section is a C-shaped, and the first filling member 500 is engaged with the inner convex portion 310 to enhance the structural stability.

[0052] In order to improve the bonding strength between the inner core 200 and the first filling piece 500, in one embodiment, the first filling piece 500 extends axially and is formed with an embedding groove 510 on the side close to the inner core 200, and the inner core 200 is arranged in the embedding groove 510. In this embodiment, the upper and lower ends of the first filling piece 500 extend radially to the two ends of the inner core 200, and the inner core 200 is clamped to form an embedding structure to improve the bonding strength.

[0053] Furthermore, the first filling piece 500 covers the outer core 300 , that is, the outer core 300 passes through the middle of the first filling piece 500 .

[0054] Furthermore, the side wall of the limiting groove 311 is an arc-shaped bend 312, and the side wall is a continuous curve constituting the limiting groove 311. Setting the side wall of the groove to a curve shape of the arc-shaped bend 312 is more conducive to dispersing the force applied to the first filling piece 500, avoiding stress concentration, and avoiding cracking of the first filling piece 500.

[0055] Similarly, the outer surfaces of the inner convex portion 310 and the outer concave portion 210 are arc-shaped curved surfaces 120 in the axial cross section.

[0056] As can be seen from the above introduction, the inner core 200 and the outer core 300 are connected by the first filling piece 500, and the force is transmitted through the first filling piece 500. In one embodiment, the inner protrusion 310 and the outer recessed portion 210 both extend axially to the two ends of the inner core 200 and the outer core 300, that is, the inner protrusion 310 is columnar, which disperses the force in the axial direction and avoids stress concentration.

[0057] In other embodiments, the inner convex portion 310 is a portion extending along one or both ends in the axial direction to the inner core 200. In one embodiment, an injection port is provided on the inner convex portion 310; the first filler 500 covers the inner convex portion 310; in other embodiments, the injection port can be provided on the mold.

[0058] Reference Figure 2 and Figure 4 In one embodiment, the rotor assembly 100 further includes a second filler 600, and a plurality of magnets 400 are disposed on the outer side of the outer core 300 through the second filler 600, and the second filler 600 covers the plurality of magnets 400 to ensure the stability of the connection of the magnets 400; the second filler 600 and the first filler 500 are separately injection molded and are not affected by each other.

[0059] In one embodiment, the second filling piece 600 includes an upper end portion 610 and a lower end portion 620 that both surround the outer iron core 300, and a plurality of limiting portions 630 that protrude from the outer surface of the outer iron core 300 and connect the upper end portion 610 and the lower end portion 620. The plurality of limiting portions 630 are distributed at intervals along the circumferential direction, and the plurality of limiting portions 630 form a plurality of accommodating cavities 640. A magnet 400 is disposed in an accommodating cavity 640.

[0060] The second filler 600 forms a frame structure, and the second filler 600 covers the magnetic steel 400, the inner core 200 and the outer core 300. The first filler 500 is arranged between the inner core 200 and the outer core 300. The first filler 500 and the second filler 600 are secondary injection molded.

[0061] In one embodiment, the first filling piece 500 and the second filling piece 600 are integrally formed, and the upper end portion 610 and / or the lower end portion 620 are provided with a plurality of groups of positioning holes for inserting positioning pins for positioning the magnetic steel 400, and one group of positioning holes is connected to a receiving cavity 640; during the injection molding process, the mold fixes the magnetic steel 400 through the positioning pins, the outer iron core 300 and the inner iron core 200 are sleeved, and the solid part is inserted into the partition groove 110 to define the cavity of the first filling piece 500 and the second filling piece 600, and glue is injected through the glue injection port 330, and the first filling piece 500 is connected to the upper end portion 610 and the lower end portion 620 to form an integral structure.

[0062] The utility model also proposes a motor, which includes a rotor assembly 100 and a stator assembly matched with the rotor assembly 100. The specific structure of the rotor assembly 100 refers to the above embodiment. Since the motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0063] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A rotor assembly, characterized in that: include: Inner iron core; An outer iron core; the outer iron core is sleeved with the inner iron core; A plurality of magnetic steels, wherein the plurality of magnetic steels are circumferentially arranged on the outer side of the outer core; and A plurality of first filling pieces are provided between the outer core and the inner core, the plurality of first filling pieces connect the inner core and the outer core, and the plurality of first filling pieces are arranged at intervals along the circumferential direction of the outer wall of the inner core.

2. The rotor assembly according to claim 1, characterized in that The plurality of first filling pieces define a plurality of partition grooves along a circumferential direction between the inner core and the outer core.

3. The rotor assembly according to claim 2, characterized in that The plurality of partitions are evenly spaced and distributed.

4. The rotor assembly according to claim 2, characterized in that: The inner wall of the outer iron core is provided with a plurality of inner convex portions at intervals along the circumferential direction, and the outer wall of the inner iron core is provided with a corresponding number of outer concave portions corresponding to the inner convex portions. The inner convex portions and the outer concave portions correspond to each other, and the first filling piece covers the inner convex portions and fills the gap between the inner convex portions and the outer concave portions.

5. The rotor assembly according to claim 4, characterized in that The inner convex portion is concave inwardly on two opposite sides in the circumferential direction to form two limiting grooves respectively, and the two ends of the first filling piece are respectively placed in the two limiting grooves.

6. The rotor assembly according to claim 5, characterized in that The side wall of the limiting groove is curved in an arc shape.

7. The rotor assembly according to claim 5, characterized in that The outer surfaces of the inner convex portion and the outer concave portion are arc-shaped curved surfaces in a cross section in the axial direction.

8. The rotor assembly according to claim 5, characterized in that The cross-section of the first filling member perpendicular to the axial direction is in a C-shape.

9. The rotor assembly according to claim 4, characterized in that: The inner convex portion and the outer concave portion both extend along the axial direction to both ends of the inner iron core and the outer iron core.

10. The rotor assembly according to claim 9, characterized in that An injection port is provided on the inner convex part.

11. The rotor assembly according to any one of claims 1 to 10, characterized in that: The rotor assembly further includes a second filling piece, and the plurality of magnetic steels are arranged on the outer side of the outer core through the second filling piece.

12. The rotor assembly according to claim 11, wherein: The second filling piece includes a plurality of limiting portions which surround the upper end and the lower end of the outer iron core, protrude from the outer surface of the outer iron core, and connect the upper end and the lower end. The plurality of limiting portions are distributed at intervals along the circumferential direction, and the plurality of limiting portions form a plurality of accommodating cavities. One of the magnetic steels is arranged in one of the accommodating cavities.

13. The rotor assembly according to claim 12, wherein: The upper end portion and / or the lower end portion is provided with a plurality of groups of positioning holes for inserting positioning pins for positioning the magnetic steel, and one group of the positioning holes is communicated with one of the accommodating chambers.

14. The rotor assembly according to claim 11, wherein: The first filling piece and the second filling piece are integrally formed; and / or, the first filling piece extends axially and is formed with a groove on a side close to the inner core, and the inner core is arranged in the groove; and / or, the first filling piece covers the outer core.

15. A motor, characterized in that: Comprising a rotor assembly as claimed in any one of claims 1 to 14.

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