Rotor assembly and axial flux motor

Abstract

The invention discloses a rotor assembly and an axial flux motor. The rotor assembly comprises a rotor bracket, a rotor iron core, rotor magnetic steel and a fixing piece, wherein the rotor iron core is arranged on the rotor bracket along the axial direction of the rotor assembly; the rotor magnetic steel is arranged on the side, away from the rotor support, of the rotor iron core in the axial direction, the rotor magnetic steel is provided with a plurality of magnetic steel sub-parts, and the multiple magnetic steel sub-parts are arranged in the circumferential direction of the rotor assembly at intervals; the fixing part is arranged on the side, away from the rotor iron core, of the rotor magnetic steel in the axial direction, the fixing part comprises a limiting structure, and the limiting structure is used for limiting the magnetic steel sub-part in the axial direction. According to the rotor assembly, the limiting structure arranged on the fixing piece is matched with the plurality of magnetic steel sub-pieces, so that the connection between the components of each rotor assembly can be reinforced in the axial direction, and the risk that the components fall off from each other is reduced.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a rotor assembly and an axial flux motor. Background Art

[0002] At present, with the continuous development of electric power technology, various types of motor-driven tools play an extremely important role in our daily life. Common motor-driven tools include corn harvesters, elevators, new energy vehicles, etc.

[0003] The motor is the core component of all kinds of motor-driven tools and is the source of power output. The motor includes radial flux motor and axial flux motor. The axial flux motor has significant advantages such as compact structure, high torque density, high power density and high efficiency, and has gradually attracted people's attention.

[0004] Axial flux motors generally include components such as brackets, cores, magnetic steel, and fixings. Traditional axial flux motors are usually fixed with adhesives. Under high temperature, high-speed rotation, and long-term temperature changes, the components are at risk of fatigue and fall off. The present application provides a rotor assembly and an axial flux motor to solve the above problems. Summary of the invention

[0005] The main purpose of the present application is to provide a rotor assembly and an axial flux motor, aiming to solve the above-mentioned technical problems existing in the prior art.

[0006] To solve the above problems, the present application provides a rotor assembly, which includes a rotor support, a rotor core, a rotor magnet and a fixing part. The rotor core is arranged on the rotor support along the axial direction of the rotor assembly; the rotor magnet is arranged on the side of the rotor core away from the rotor support along the axial direction, and the rotor magnet is provided with a plurality of magnet sub-components, and the plurality of magnet sub-components are arranged at intervals along the circumferential direction of the rotor assembly; the fixing part is arranged on the side of the rotor magnet away from the rotor core along the axial direction, and the fixing part includes a limiting structure, which is used to limit the magnet sub-component in the axial direction.

[0007] Further, the fixing member includes an inner fixing ring and an outer fixing ring, and the inner fixing ring and the outer fixing ring are spaced apart in the radial direction of the rotor assembly. The limiting structure includes a plurality of first clamping strips, and the plurality of first clamping strips are arranged on the side of the inner fixing ring facing the outer fixing ring or on the side of the outer fixing ring facing the inner fixing ring. The plurality of first clamping strips are spaced apart in the circumferential direction, and each of the magnetic steel sub-components is provided with a first clamping groove corresponding to one of the first clamping strips, and the first clamping strip is clamped in the first clamping groove.

[0008] Furthermore, the limiting structure also includes a plurality of limiting bars, which extend along the radial direction to respectively connect the inner fixing ring and the outer fixing ring, one of the first clamping bars is located between two of the limiting bars, and one of the limiting bars is clamped at the interval between two of the magnetic steel sub-components.

[0009] Furthermore, one of the limiting strip and the magnetic steel sub-component is provided with a second clamping groove in the circumferential direction, and the other is provided with a second clamping strip in the circumferential direction, and the second clamping strip is clamped in the second clamping groove.

[0010] Furthermore, the limiting structure includes a plurality of limiting bars, and the plurality of limiting bars are arranged at intervals along the circumferential direction, one limiting bar is clamped at the interval between two magnetic steel sub-components, and the dimension of the limiting bar at one end close to the rotor core in the circumferential direction is smaller than the dimension of the limiting bar at one end away from the rotor core in the circumferential direction.

[0011] Furthermore, the limiting structure includes a plurality of limiting strips, and the plurality of limiting strips are arranged at intervals along the circumferential direction. The limiting strips include a strip-shaped body and a limiting body. One of the strip-shaped bodies is clamped at the interval between two of the magnetic steel sub-components. The strip-shaped body and the limiting body are connected. The limiting body is inclined toward the outside of the strip-shaped body in the axial direction, and the limiting body is used to limit the magnetic steel sub-component in the axial direction.

[0012] Furthermore, the number of the limiting bodies is at least two, the inclination directions of the two limiting bodies are opposite, and the two limiting bodies are respectively used to limit the magnetic steel sub-components located on both sides of the strip body.

[0013] Furthermore, a surface of the rotor core facing the rotor magnetic steel is provided with a plurality of first convex strips spaced apart along the circumferential direction, and one of the first convex strips is clamped at a gap between two of the magnetic steel sub-components.

[0014] Furthermore, the rotor support is provided with an outer ring support, an inner ring support and a transition support, the inner ring support is located inside the outer ring support, the transition support connects the outer ring support and the inner ring support, the outer ring support and the inner ring support protrude from the transition support along the circumferential direction to cooperate to form an accommodation space, the rotor core is located in the accommodation space, and abuts against the transition support in the axial direction.

[0015] Furthermore, one of the two side surfaces of the transition bracket and the rotor core that are opposite to each other is provided with a second convex strip, and the other is provided with a filling groove, and the second convex strip is clamped in the filling groove.

[0016] Furthermore, the transition bracket is provided with a plurality of positioning grooves spaced apart along the circumferential direction, and the surface of the rotor core on one side facing the transition bracket is provided with a plurality of positioning protrusions spaced apart along the circumferential direction, and the positioning protrusions are embedded in the positioning grooves.

[0017] Furthermore, the inner ring bracket includes a plurality of first positioning surfaces, which are arranged at intervals along the circumferential direction, and the rotor magnet is provided with a plurality of second positioning surfaces, which are sleeved on the outside of the inner ring bracket so that one of the first positioning surfaces and one of the second positioning surfaces abut against each other.

[0018] Further, the fixing member includes an inner fixing ring and an outer fixing ring, the inner fixing ring and the outer fixing ring are spaced apart in the radial direction of the rotor assembly, the limiting structure is connected to the inner fixing ring and / or the outer fixing ring, the inner fixing ring is fixedly connected to the inner ring bracket, and the outer fixing ring is fixedly connected to the outer ring bracket.

[0019] In order to solve the above problems, the present application also provides an axial flux motor, which includes the rotor assembly as described above.

[0020] Compared with the prior art, the rotor assembly of the present application includes a rotor support, a rotor core, a rotor magnet and a fixing part. The rotor core is arranged on the rotor support along the axial direction of the rotor assembly; the rotor magnet is arranged on the side of the rotor core away from the rotor support along the axial direction, and the rotor magnet is provided with a plurality of magnet sub-components, and the plurality of magnet sub-components are arranged at intervals along the circumferential direction of the rotor assembly; the fixing part is arranged on the side of the rotor magnet away from the rotor core along the axial direction, and the fixing part includes a limiting structure, and the limiting structure is used to limit the magnet sub-components in the axial direction. By cooperating with the plurality of magnet sub-components, the fixing between the various components of the rotor assembly can be strengthened in the axial direction, so that the fixing between the rotor support, the rotor core, the rotor magnet and the fixing part is strengthened, and the risk of the various components falling off from each other is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic structural diagram of an embodiment of a rotor assembly provided by the present application;

[0023] Figure 2 yes Figure 1An exploded schematic diagram of the rotor assembly is shown;

[0024] Figure 3 It is a schematic structural diagram of a first embodiment of a fixing member provided by the present application;

[0025] Figure 4 is a structural schematic diagram of a first embodiment of a rotor magnetic steel provided by the present application;

[0026] Figure 5 is a schematic structural diagram of a second embodiment of a fixing member provided by the present application;

[0027] Figure 6 Is adopted Figure 5 A schematic top view of the rotor assembly structure after the fixing parts are assembled;

[0028] Figure 7 yes Figure 6 The cross-sectional schematic diagram of the rotor assembly shown along the AA direction;

[0029] Figure 8 yes Figure 7 An enlarged schematic diagram of the structure within the dashed box is shown;

[0030] Fig. 9 is a schematic structural diagram of a third embodiment of a fixing member provided in the present application;

[0031] Fig.10 is a schematic structural diagram of a first embodiment of a rotor core provided by the present application;

[0032] Fig.11 is a schematic structural diagram of a first embodiment of a rotor support provided by the present application;

[0033] Fig.12 is a schematic structural diagram of a second embodiment of a rotor core provided by the present application;

[0034] Fig.13 is a schematic structural diagram of a third embodiment of a rotor core provided in the present application;

[0035] Fig.14 is a structural schematic diagram of a second embodiment of a rotor support provided by the present application;

[0036] Fig.15 It is a schematic structural diagram of the second embodiment of the rotor magnetic steel provided in the present application.

[0037] Description of the drawings: rotor assembly 1; rotor bracket 10; outer ring bracket 110; inner ring bracket 120; first positioning surface 121; transition bracket 130; positioning groove 131; second convex strip 140; rotor core 20; first convex strip 210; core groove 220; filling groove 230; positioning protrusion 240; rotor magnet 30; magnet sub-component 310; first clamping groove 320; second positioning surface 330; fixing part 40; limiting structure 410; first clamping strip 411; limiting strip 412; partition part 4120; fixing part 4130; strip-shaped body 4140; limiting body 4150; inner fixing ring 420; outer fixing ring 430; axial direction X; radial direction Y; circumferential direction Z. DETAILED DESCRIPTION

[0038] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0040] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0041] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0043] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0044] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0045] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0046] The motor is the core component of all kinds of motor-driven tools and is the source of power output. The motor includes radial flux motor and axial flux motor. The axial flux motor has significant advantages such as compact structure, high torque density, high power density and high efficiency, and has gradually attracted people's attention.

[0047] Axial flux motors generally include components such as brackets, cores, magnets, and fixings. The components of traditional axial flux motors are usually fixed mainly by adhesives. Under the influence of high temperature, high-speed rotation, and long-term temperature alternation, the components are at risk of fatigue and falling off.

[0048] See also Figure 1 and Figure 2 , Figure 1 is a schematic structural diagram of an embodiment of a rotor assembly provided in the present application, Figure 2 yes Figure 1 An exploded schematic diagram of the rotor assembly is shown.

[0049] The rotor assembly 1 includes a rotor support 10, a rotor core 20, a rotor magnetic steel 30 and a fixing member 40. The rotor core 20 is arranged on the rotor support 10 along the axial direction X of the rotor assembly 1; the rotor magnetic steel 30 is arranged on the side of the rotor core 20 away from the rotor support 10 along the axial direction X, and the rotor magnetic steel 30 is provided with a plurality of magnetic steel sub-components 310, and the plurality of magnetic steel sub-components 310 are arranged at intervals along the circumferential direction Z of the rotor assembly 1; the fixing member 40 is arranged on the side of the rotor magnetic steel 30 away from the rotor core 20 along the axial direction X, and the fixing member 40 includes a limiting structure 410, and the limiting structure 410 is used to limit the magnetic steel sub-component 310 in the axial direction X.

[0050] First, when the rotor assembly 1 is assembled, the rotor core 20 is sleeved on the rotor bracket 10, so that one side of the rotor core 20 is adjacent to one side of the rotor bracket 10, the rotor magnetic steel 30 is placed on the rotor core 20 so that the other side of the rotor core 20 is adjacent to one side of the rotor magnetic steel 30, the fixing part 40 is placed on the rotor magnetic steel 30 and is located on the outside of the entire rotor assembly 1, the other side of the rotor magnetic steel 30 is adjacent to one side of the fixing part 40, and a circular hole is left at the center of the rotor bracket 10 for assembling the motor rotating shaft. The rotor core 20 is wound by electrical silicon steel sheets or made of high magnetic permeability materials such as SMC soft magnetic materials, and the rotor bracket 10 and the fixing part 40 can be an integrated structure made of reverse magnetic materials or polymers or a composite of the two. The polymer can be plastic, such as PA6GF35 composite material (a composite material of polyamide 6 and 35% glass fiber), and the reverse magnetic material can be stainless steel, such as austenitic stainless steel (SUS304), so that the fixing part 40 has insulation properties and reverse magnetic properties.

[0051] The limiting structure 410 provided by the fixing member 40 limits the axial movement of the rotor magnet 30, and the rotor core 20 and the rotor bracket 10 are pressed under the rotor magnet 30 and the fixing member 40, thereby strengthening the connection between the various components of the entire rotor assembly 1 and reducing the risk of the components falling off from each other. It should be noted that an adhesive is also provided between the adjacent surfaces of the rotor bracket 10, the rotor core 20, the rotor magnet 30, and the fixing member 40 to assist in the connection. The connection and fixation between the various components of the rotor assembly 1 is mainly based on the limiting structure 410, and the adhesive is supplemented, so that the connection and fixation of the various components of the rotor assembly 1 are strengthened, and the adhesive has an insulating effect.

[0052] See also Figure 3 and Figure 4 , Figure 3 is a schematic structural diagram of a first embodiment of a fixing member provided in the present application, Figure 4 It is a schematic structural diagram of the first embodiment of the rotor magnetic steel provided in the present application.

[0053] The fixing member 40 includes an inner fixing ring 420 and an outer fixing ring 430, and the inner fixing ring 420 and the outer fixing ring 430 are arranged at intervals in the radial direction Y of the rotor assembly 1. The limiting structure 410 includes a plurality of first clamping strips 411, and the plurality of first clamping strips 411 are arranged on the side of the inner fixing ring 420 facing the outer fixing ring 430 or on the side of the outer fixing ring 430 facing the inner fixing ring 420. The plurality of first clamping strips 411 are arranged at intervals in the circumferential direction Z. Each magnetic steel sub-component 310 is provided with a first clamping groove 320 corresponding to a first clamping strip 411, and the first clamping strip 411 is clamped in the first clamping groove 320.

[0054] The inner fixing ring 420 and the outer fixing ring 430 are concentric circles, and the inner fixing ring 420 has a smaller diameter than the outer fixing ring 430. The center of the fixing member 40 has a circular hole for sleeve-accommodating the central part of the rotor bracket 10. The inner fixing ring 420 and the outer fixing ring 430 can limit the position of the rotor magnet 30 in the radial direction Y. The limiting structure 410 includes a first clamping strip 411 arranged on the inner fixing ring 420 or the outer fixing ring 430, and the first clamping strip 411 protrudes from the inner fixing ring 420 or the outer fixing ring 430 and presents an arc shape. The first clamping groove 320 is arranged on the inner and outer sides of the magnetic steel sub-component 310 along the radial direction Y, and the first clamping groove 320 is an arc-shaped groove. The first clamping strip 411 and the first clamping groove 320 are clamped and matched so that the rotor magnet 30 is limited and fixed in the axial direction. It should be noted that the shape of the first clamping strip 411 is not limited to an arc shape. For example, in other embodiments, the shape of the first clamping strip 411 may also be a raised triangle, a raised trapezoid, a raised sphere, etc., depending on the actual situation, and is not a limitation of the present application. The first clamping strip 411 and the fixing member 40 are an integral structure, which can be formed by injection molding after the rotor core 20 and the rotor magnetic steel 30 are assembled on the rotor bracket 10. The injection molding material can be a polymer, such as plastic, or other polymer materials, which are not limited here.

[0055] The limiting structure 410 also includes a plurality of limiting bars 412 , which extend along the radial direction Y to respectively connect the inner fixing ring 420 and the outer fixing ring 430 , a first clamping bar 411 is located between two limiting bars 412 , and a limiting bar 412 is clamped at the interval between two magnetic steel sub-components 310 .

[0056] The limiting strips 412 are evenly spaced in the circumferential direction Z of the fixing member 40, one end of which is connected to the inner fixing ring 420, and the other end is connected to the outer fixing ring 430. On the one hand, the limiting strips 412 can make the entire fixing member 40 structure more stable, and on the other hand, the cavity formed between two adjacent limiting strips 412 is used to separate and accommodate the fixed magnetic steel sub-components 310 in the circumferential direction Z. The first clamping strip 411 is located on the inner fixing ring 420 and the outer fixing ring 430 between two adjacent limiting strips 412 to correspond to the rotor magnetic steel 30 for limiting and fixing.

[0057] One of the limiting strip 412 and the magnetic steel sub-component 310 is provided with a second clamping groove in the circumferential direction Z, and the other is provided with a second clamping strip in the circumferential direction Z, and the second clamping strip is clamped in the second clamping groove.

[0058] The limiting structure 410 of the fixing member 40 also includes a second clamping groove or a second clamping strip. The first clamping strip 411 provided on the inner fixing ring 420 and the outer fixing ring 430 can be provided on both sides of the limiting strip 412 along the circumferential direction to obtain the second clamping strip, and the first clamping groove 320 provided on both sides of the inner and outer sides of the magnetic steel sub-component 310 along the radial direction Y can be provided on both sides of the magnetic steel sub-component 310 in the circumferential direction Z to obtain the second clamping groove. It can be understood that the second clamping strip can also be provided on the magnetic steel sub-component 310, and the second clamping groove is adapted to be provided on the limiting strip 412.

[0059] See also Figure 5 , Figure 6 , Figure 7 and Figure 8 , Figure 5 is a schematic structural diagram of a second embodiment of a fixing member provided in the present application, Figure 6 Is adopted Figure 5 The schematic diagram of the top view of the rotor assembly structure after the fixing parts are assembled is shown in FIG. Figure 7 yes Figure 6 The cross-sectional schematic diagram of the rotor assembly along the AA direction is shown in FIG. Figure 8 yes Figure 7 An enlarged schematic diagram of the structure within the dashed box is shown.

[0060] The limiting structure 410 includes a plurality of limiting bars 412, and the plurality of limiting bars 412 are arranged at intervals along the circumferential direction Z. One limiting bar 412 is clamped at the interval between two magnetic steel sub-components 310, and the size of the limiting bar 412 at one end close to the rotor core 20 in the circumferential direction Z is smaller than the size of the limiting bar 412 at one end away from the rotor core 20 in the circumferential direction Z.

[0061] The limiting strip 412 includes two parts, the part close to one end of the rotor core 20 in the axial direction is the partition 4120, and the part far away from one end of the rotor core 20 in the axial direction is the fixing part 4130. The fixing part 4130 is located above the partition 4120, and the fixing part 4130 is in the shape of a trapezoidal column, and the width of its upper surface in the circumferential direction is greater than the width of the partition 4120 in the circumferential direction. The lower surface where the fixing part 4130 and the partition 4120 contact each other has the same width in the circumferential direction, and the fixing part 4130 has inclined surfaces extending obliquely from the lower surface along the upper surface on both sides in the circumferential direction. The inner fixing ring 420 and the outer fixing ring 430 are provided with a plurality of protrusions in the circumferential direction Z, and the limiting strip 412 and the inner fixing ring 420 and the outer fixing ring 430 are clamped by the protrusions, and the width of the protrusions in the circumferential direction is less than the width of the partition 4120 in the circumferential direction. When the fixing member 40 is assembled on the rotor magnet 30 , the inclined surface of the fixing portion 4130 will limit and fix the rotor magnet 30 in the axial direction. In this embodiment, the fixing member 40 and the limiting strip 412 can be obtained by injection molding.

[0062] See also Fig. 9 , Fig. 9 It is a schematic structural diagram of a third embodiment of the fixing member provided in the present application.

[0063] In this embodiment, the limiting structure 410 includes a plurality of limiting strips 412, and the plurality of limiting strips 412 are arranged at intervals along the circumferential direction Z. The limiting strips 412 include a strip-shaped body 4140 and a limiting body 4150. A strip-shaped body 4140 is clamped at the interval between two magnetic steel sub-components 310. The strip-shaped body 4140 and the limiting body 4150 are connected. The limiting body 4150 is inclined toward the outer side of the strip-shaped body 4140 in the axial direction X. The limiting body 4150 is used to limit the magnetic steel sub-component 310 in the axial direction X.

[0064] The limiting strip 412 includes a strip body 4140 and a limiting body 4150. The limiting body 4150 and the strip body 4140 are an integral structure. The limiting body 4150 can be formed by stamping. The limiting body 4150 is provided with holes and grooves on both sides to facilitate the stamping operation. The strip body 4140 and the limiting body 4150 can also be assembled by welding and riveting, and then insulated by electrophoresis, spraying, painting, anodizing and other processes. The strip body 4140 is connected to the inner fixing ring 420 and the outer fixing ring 430, and is used to circumferentially separate and fix the magnetic steel sub-component 310. The strip body 4140 and the inner fixing ring 420 and the outer fixing ring 430 are connected at the connection point. The air-avoiding hole groove is used to avoid the corner of the magnetic steel sub-component 310 when installing it to reduce the contact with the pressure plate. The limiting body 4150 is arranged on both sides of the contact between the limiting strip 412 and the magnetic steel sub-component 310, and is in the shape of a wedge-shaped column as a whole. The limiting body 4150 is inclined toward the outside of the strip body 4140 so that at least part of the limiting body 4150 is located above the magnetic steel sub-component 310 in the axial direction X, thereby limiting the axial movement of the magnetic steel sub-component 310.

[0065] The number of the limiting bodies 4150 is at least two, and the two limiting bodies 4150 are inclined in opposite directions. The two limiting bodies 4150 are respectively used to limit the magnetic steel sub-components 310 located on both sides of the strip body 4140.

[0066] The limiting bodies 4150 are located on both sides of the strip body 4140, and the number of the limiting bodies 4150 on both sides is the same. In this embodiment, the number of limiting bodies 4150 is 4, 2 on each side of the strip body 4140. The number of limiting bodies 4150 can also be other values, such as 6, which is not limited here. The limiting bodies 4150 on both sides of the strip body 4140 are inclined in opposite directions, that is, they are inclined toward the outside of the strip body 4140 so that the limiting bodies 4150 are at least partially located above the magnetic steel sub-component 310 in the axial direction X, so that the limiting bodies 4150 on both sides of the strip body 4140 respectively limit the axial position of the adjacent magnetic steel sub-component 310.

[0067] See also Fig.10 , Fig.10 It is a schematic structural diagram of the first embodiment of the rotor core provided in the present application.

[0068] A surface of the rotor core 20 facing the rotor magnetic steel 30 is provided with a plurality of first protrusions 210 spaced apart along the circumferential direction Z, and one first protrusion 210 is clamped at the interval between two magnetic steel sub-components 310 .

[0069] An iron core groove 220 is formed between adjacent first protrusions 210 , and the size of the iron core groove 220 matches the magnetic steel sub-component 310 , so that when the magnetic steel sub-component 310 is placed on the rotor core 20 , the iron core groove 220 can accommodate part of the magnetic steel sub-component 310 , which helps to fix the magnetic steel sub-component 310 .

[0070] See also Fig.11 , Fig.11 It is a schematic structural diagram of the first embodiment of the rotor bracket provided in the present application.

[0071] The rotor support 10 is provided with an outer ring support 110, an inner ring support 120 and a transition support 130. The inner ring support 120 is located inside the outer ring support 110. The transition support 130 connects the outer ring support 110 and the inner ring support 120. The outer ring support 110 and the inner ring support 120 protrude from the transition support 130 along the circumferential direction Z to cooperate to form an accommodating space. The rotor core 20 is located in the accommodating space and abuts against the transition support 130 in the axial direction X.

[0072] A circular hole is provided at the center of the inner ring bracket 120 for installing the rotating shaft of the motor. The rotor core 20 is sleeved in the accommodating space formed by the outer side of the inner ring bracket 120 and the outer ring bracket 110. The transition bracket 130 is abutted against one side of the core. The shape and size of the accommodating space and the transition bracket 130 match the shape and size of the core, so as to position, install and fix the rotor core 20.

[0073] See also Fig.11 and Fig.12 , Fig.11 is a schematic structural diagram of a first embodiment of a rotor support provided in the present application, Fig.12 It is a schematic structural diagram of a second embodiment of the rotor core provided in the present application.

[0074] One of the two opposite surfaces of the transition bracket 130 and the rotor core 20 is provided with a second protrusion 140 , and the other is provided with a filling groove 230 , and the second protrusion 140 is locked in the filling groove 230 .

[0075] A filling groove 230 is provided in the radial direction on the side where the rotor core 20 and the rotor bracket 10 abut each other, and a second convex strip 140 is provided in the radial direction on the corresponding transition bracket 130. The second convex strip 140 is in the shape of a rectangular parallelepiped. The second convex strip 140 may also be in other shapes, such as an arc-shaped protrusion, a triangular protrusion, etc., as long as the shape of the filling groove 230 matches the shape of the second convex strip 140. It should be noted that in other embodiments, the second convex strip 140 may also be provided on the rotor core 20, and the filling groove 230 may be provided on the transition bracket 130. The number of the second convex strip 140 and the filling groove 230 may be other values, such as 4, 6, etc., which are not limited here.

[0076] See also Fig.11 and Fig.13 , Fig.11 is a schematic structural diagram of a first embodiment of a rotor support provided in the present application, Fig.13 It is a schematic structural diagram of the third embodiment of the rotor core provided in the present application.

[0077] The transition bracket 130 is provided with a plurality of positioning grooves 131 spaced apart along the circumferential direction Z. The surface of the rotor core facing the transition bracket 130 is provided with a plurality of positioning protrusions 240 spaced apart along the circumferential direction Z. The positioning protrusions 240 are embedded in the positioning grooves 131 .

[0078] The positioning protrusion 240 provided on the core and the positioning groove 131 on the transition bracket 130 cooperate and snap together so that the rotor core 20 is fixed, and at the same time, the second protrusion 140 on the rotor bracket 10 can be snapped between two adjacent positioning protrusions 240. In this embodiment, the positioning protrusion 240 is in the shape of a fan-shaped cylinder, and in other embodiments, it can also be other shapes, such as a square cylinder, a rectangular cylinder, etc., as long as the positioning protrusion 240 and the positioning groove 131 match. Providing the positioning groove 131 on the transition bracket 130 also helps to reduce the weight of the rotor bracket 10 and reduce eddy current losses. The cooperation between the positioning protrusion 240 and the positioning groove 131 makes the mass distribution of the rotor core 20 more uniform, which helps to reduce the vibration of the rotor assembly during rotation.

[0079] See also Fig.14 and Fig.15 , Fig.14 is a schematic structural diagram of a second embodiment of a rotor support provided in the present application, Fig.15 It is a schematic structural diagram of the second embodiment of the rotor magnetic steel provided in the present application.

[0080] The inner ring bracket 120 includes a plurality of first positioning surfaces 121 , which are spaced apart along the circumferential direction. The rotor magnet 30 is provided with a plurality of second positioning surfaces 330 , which are sleeved on the outer side of the inner ring bracket 120 so that a first positioning surface 121 and a second positioning surface 330 abut against each other.

[0081] The cooperation between the first positioning surface 121 on the inner ring bracket 120 and the second positioning surface 330 on the rotor magnetic steel 30 facilitates the positioning and installation of the rotor magnetic steel 30, and ensures the concentricity after installation. The second positioning surface 330 is arranged on the inner side of the magnetic steel sub-component 310 in the radial direction Y. The shape of the first positioning surface 121 can be a straight edge surface or a circular surface, or other shapes, as long as the shapes of the first positioning surface 121 and the second positioning surface 330 are adapted.

[0082] See also Figure 5 and Fig.11 , Figure 5 is a schematic structural diagram of a second embodiment of a fixing member provided in the present application, Fig.11 It is a schematic structural diagram of the first embodiment of the rotor bracket provided in the present application.

[0083] The fixing member 40 includes an inner fixing ring 420 and an outer fixing ring 430, and the inner fixing ring 420 and the outer fixing ring 430 are arranged at intervals in the radial direction Y of the rotor assembly 1. The limiting structure 410 is connected to the inner fixing ring 420 and / or the outer fixing ring 430, the inner fixing ring 420 is fixedly connected to the inner ring bracket 120, and the outer fixing ring 430 is fixedly connected to the outer ring bracket 110.

[0084] The inner fixing ring 420 and the outer fixing ring 430 of the fixing member 40 are provided with holes along the circumferential direction, and the inner ring bracket 120 and the outer ring bracket 110 of the rotor bracket 10 are also provided with holes along the circumferential direction. By placing screws in the holes, the fixing member 40 and the rotor bracket 10 are fixedly connected.

[0085] In summary, the present application provides a rotor assembly 1, which strengthens the fixation of the rotor magnetic steel 30 by setting a limiting structure 410 on the fixing member 40 and cooperating with the rotor magnetic steel 30. The limiting structure 410 includes a first clamping strip 411, a limiting strip 412, a second clamping groove, a second clamping strip, a wedge-shaped inclined surface, etc. The rotor core 20 is provided with a protrusion or a groove to cooperate and fix the rotor magnetic steel 30 with the rotor bracket 10. The rotor bracket 10 is provided with a protrusion, a groove, a positioning surface, etc. to cooperate and fix the rotor core 20 and the rotor magnetic steel 30. By setting a mutually cooperating mechanical structure, the various components of the rotor assembly 1 are mechanically fixed and strengthened, and the various components are then fixed with adhesives to effectively reduce the risk of fatigue shedding between the various components of the rotor assembly 1. The special structure of the rotor assembly 1 of the present application also helps to reduce weight and reduce eddy current losses, and also improves the concentricity between the various components of the rotor assembly 1 after assembly. The rotor support 10 and the fixing part 40 are an integral structure made of a reverse magnetic material or a polymer or a composite of the two, so that the circumferential, radial and axial fixation of each component of the rotor assembly 1 is achieved by an integral structure, which helps to reduce the risk of each component of the rotor assembly 1 falling off, and the rotor assembly 1 has good reliability. The materials used in the rotor support 10 and the fixing part 40 have the ability to insulate the magnetic circuit and the circuit, and the special structure of the fixing part 40 can reduce the contact between the rotor magnetic steel 30 and the rotor support 10, so that the rotor magnetic steel 30 and the rotor support 10 are insulated.

[0086] To solve the related technical problems, the present application also provides an axial flux motor, which includes the above-mentioned rotor assembly 1. The axial flux motor includes but is not limited to a single-stator dual-rotor flux motor and a single-rotor dual-stator flux motor. The axial flux motor of the present application can be applied to electric tools such as new energy vehicles, elevators, and corn harvesters.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A rotor assembly, characterized in that: The rotor assembly comprises: Rotor bracket; A rotor core, arranged on the rotor support along the axial direction of the rotor assembly; A rotor magnetic steel, arranged along the axial direction on a side of the rotor core away from the rotor support, the rotor magnetic steel having a plurality of magnetic steel sub-components, and the plurality of magnetic steel sub-components being arranged at intervals along the circumferential direction of the rotor assembly; A fixing member is arranged along the axial direction on a side of the rotor magnetic steel away from the rotor core, and the fixing member includes a limiting structure, and the limiting structure is used to limit the magnetic steel sub-component in the axial direction.

2. The rotor assembly according to claim 1, characterized in that: The fixing member includes an inner fixing ring and an outer fixing ring, and the inner fixing ring and the outer fixing ring are arranged at intervals in the radial direction of the rotor assembly. The limiting structure includes a plurality of first clamping strips, and the plurality of first clamping strips are arranged on the side of the inner fixing ring facing the outer fixing ring or on the side of the outer fixing ring facing the inner fixing ring. The plurality of first clamping strips are arranged at intervals in the circumferential direction, and each of the magnetic steel sub-components is provided with a first clamping groove corresponding to one of the first clamping strips, and the first clamping strip is clamped in the first clamping groove.

3. The rotor assembly according to claim 2, characterized in that: The limiting structure also includes a plurality of limiting strips, which extend along the radial direction to respectively connect the inner fixing ring and the outer fixing ring, one of the first clamping strips is located between two of the limiting strips, and one of the limiting strips is clamped at the interval between two of the magnetic steel sub-components.

4. The rotor assembly according to claim 3, characterized in that: One of the limit strip and the magnetic steel sub-component is provided with a second clamping groove in the circumferential direction, and the other is provided with a second clamping strip in the circumferential direction, and the second clamping strip is clamped in the second clamping groove.

5. The rotor assembly according to claim 1, characterized in that: The limiting structure includes a plurality of limiting bars, which are spaced apart along the circumferential direction, one limiting bar being clamped at the interval between two magnetic steel sub-components, and a dimension of the limiting bar at one end close to the rotor core in the circumferential direction is smaller than a dimension of the limiting bar at one end away from the rotor core in the circumferential direction.

6. The rotor assembly according to claim 1, characterized in that: The limiting structure includes a plurality of limiting strips, and the plurality of limiting strips are arranged at intervals along the circumferential direction. The limiting strips include a strip-shaped body and a limiting body. One of the strip-shaped bodies is clamped at the interval between two of the magnetic steel sub-components. The strip-shaped body and the limiting body are connected. The limiting body is inclined toward the outside of the strip-shaped body in the axial direction. The limiting body is used to limit the magnetic steel sub-component in the axial direction.

7. The rotor assembly according to claim 6, characterized in that: The number of the limiting bodies is at least two, the two limiting bodies are inclined in opposite directions, and the two limiting bodies are respectively used to limit the magnetic steel sub-components located on both sides of the strip body.

8. The rotor assembly according to claim 1, characterized in that: A surface of the rotor core facing the rotor magnetic steel is provided with a plurality of first convex strips spaced apart along the circumferential direction, and one of the first convex strips is clamped at the interval between two magnetic steel sub-components.

9. The rotor assembly according to any one of claims 1 to 8, characterized in that: The rotor support is provided with an outer ring support, an inner ring support and a transition support, the inner ring support is located inside the outer ring support, the transition support connects the outer ring support and the inner ring support, the outer ring support and the inner ring support protrude from the transition support along the circumferential direction to cooperate to form a receiving space, the rotor core is located in the receiving space, and abuts against the transition support in the axial direction.

10. The rotor assembly according to claim 9, characterized in that: One of the two opposite sides of the transition bracket and the rotor core is provided with a second convex strip, and the other is provided with a filling groove, and the second convex strip is clamped in the filling groove.

11. The rotor assembly according to claim 9, characterized in that: The transition bracket is provided with a plurality of positioning grooves spaced apart along the circumferential direction, and the surface of the rotor core facing the transition bracket is provided with a plurality of positioning protrusions spaced apart along the circumferential direction, and the positioning protrusions are embedded in the positioning grooves.

12. The rotor assembly according to claim 9, characterized in that: The inner ring bracket includes a plurality of first positioning surfaces, which are arranged at intervals along the circumferential direction. The rotor magnet is provided with a plurality of second positioning surfaces, and the rotor magnet is sleeved on the outer side of the inner ring bracket so that one of the first positioning surfaces and one of the second positioning surfaces abut against each other.

13. The rotor assembly according to claim 9, characterized in that: The fixing member includes an inner fixing ring and an outer fixing ring, the inner fixing ring and the outer fixing ring are spaced apart in the radial direction of the rotor assembly, the limiting structure is connected to the inner fixing ring and / or the outer fixing ring, the inner fixing ring is fixedly connected to the inner ring bracket, and the outer fixing ring is fixedly connected to the outer ring bracket.

14. An axial flux motor, characterized in that: The axial flux motor comprises a rotor assembly as claimed in any one of claims 1 to 13.

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