Brushless motor and brushless motor structure thereof

Abstract

The utility model provides a brushless motor and a brushless motor structure thereof. The brushless motor comprises a stator, a rotor (201) and a motor shaft (2). Among a plurality of flat-plate-shaped magnetic steels (6) which are attached to a mounting surface (71), facing a stator (101), of a rotor (201) in the radial direction and are arranged in the circumferential direction, adjacent magnetic steels (6) are directly combined, and the direct combination comprises direct contact or an integral component. Compared with a non-direct-combination structure, the magnetic performance such as the magnetic flux maximum value, the air gap magnetic induction intensity maximum value, the air gap magnetic induction intensity effective value and the like in unit length is improved by adopting a structure that adjacent magnetic steels are directly combined with each other.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to brushless motors and their structures. Background Technology

[0002] Patent document CN201623552U, published on November 3, 2010, discloses a rotor structure for an external rotor brushless motor, wherein there is a gap between the magnets to be filled with fixing glue by injection molding or filling, that is, the magnets do not directly contact each other.

[0003] Patent document CN204721125U, published on October 21, 2015, discloses a rotor structure for an external rotor brushless motor. Compared with patent document CN201623552U, it adds a magnet slot and a spacer between the magnets, so that the magnets are still not in direct contact with each other.

[0004] Patent document CN110165806A, published on August 23, 2019, discloses a rotor structure for an external rotor brushless motor. Compared with the spacer bar in patent document CN204721125U, the rotor core has magnetic isolation grooves at both ends of each magnet slot that communicate with the magnet slots. Magnetic isolation filling blocks are provided in the magnetic isolation grooves. The magnets are still not in direct contact with each other, and the use of magnetic isolation filling blocks further weakens the magnetic circuit relationship between the magnets.

[0005] Patent document CN218071134U, published on December 16, 2022, improves upon the aforementioned patent document and discloses a rotor structure for an external rotor brushless motor. Compared to patent documents CN201623552U, CN204721125U, and CN110165806A, a magnetic guide ring is added between the magnet and the inner wall of the rotor housing to strengthen the magnetic circuit relationship between the magnets. However, this comes at the cost of requiring an additional magnetic guide ring. The magnets are positioned between two adjacent positioning protrusions of the magnetic guide ring and are separated from each other, without adopting a direct contact route between the magnets. In other words, the magnets are still not in direct contact with each other. Utility Model Content

[0006] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a brushless motor and its structure.

[0007] According to the present invention, a brushless motor structure includes: a stator 101, a rotor 201, and a motor shaft 2; the stator 101 and the motor shaft 2 are fastened together; the rotor 201 surrounds the stator 101 and is mounted on the motor shaft 2 by bearings; the windings 3 of the stator 101 are electrically connected to lead wires 1, which extend to the outside of the motor shaft 2.

[0008] In the multiple circumferentially arranged flat magnets 6 that are attached to the mounting surface 71 of the stator 101 in the radial direction inward of the rotor 201, adjacent magnets 6 are directly coupled, wherein the direct coupling includes direct contact or being an integral component.

[0009] Preferably, the multiple magnets 6 are independent components, and the direct connection means that the magnets 6 adjacent to each other in the circumferential direction are in direct contact with each other after being attached to the mounting surface 71.

[0010] Preferably, the side surfaces 60 of adjacent magnets 6 are in direct contact; the inner surface 61 of the magnet 6 is parallel to the outer surface 62, and the side surface 60 of the magnet 6 is a convex arc surface.

[0011] Or,

[0012] The inner surfaces 61 of adjacent magnets 6 are in direct contact with each other at their edges 610; the magnets 6 are rectangular magnets, and the edge 610 refers to the right angle structure or chamfer structure between the inner surface 61 and the side surface 60 of the magnets 6.

[0013] Preferably, the direct connection means that the multiple magnets 6 are connected as a whole ring component.

[0014] Preferably, the opening at one axial end of the rotor 201 allows multiple magnets 6 of the integral component to enter the rotor 201 axially and be mounted on the mounting surface 71.

[0015] Preferably, among the multiple circumferentially arranged flat magnets 6 that are attached to the mounting surface 71 of the rotor 201 in the radial direction inward toward the stator 101, all or part of the side surfaces 60 of adjacent magnets 6 are directly bonded together.

[0016] Or,

[0017] In the multiple circumferentially arranged flat magnets 6 that are attached to the mounting surface 71 of the stator 101 in the radial direction of the rotor 201, the edges 610 of the inner surfaces 61 of all or part of the adjacent magnets 6 are directly joined.

[0018] Preferably, the mounting surface 71 of the rotor 201 facing radially inward toward the stator 101 is a plane that matches the outer surface 62 of the magnet 6.

[0019] Preferably, the planes provided by the multiple mounting surfaces 71 enclose a polygon.

[0020] Preferably, the polygon is a regular polygon.

[0021] According to the present invention, a brushless motor includes a housing and a brushless motor structure located within the housing.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. By employing a structure where adjacent magnets are directly connected, compared to a non-directly connected structure, the magnetic properties such as the maximum magnetic flux per unit length, the maximum air gap magnetic induction intensity, and the effective value of the air gap magnetic induction intensity are all improved. It eliminates the need for an additional magnetic guide ring between the magnets and the inner wall of the rotor housing.

[0024] 2. By adopting a structure in which adjacent magnets are in direct contact with each other, compared to a structure that is not directly connected, the accuracy of the magnet installation position can be improved during the installation of magnets. The magnets that are attached later can be accurately positioned by contact. Furthermore, when attaching the last magnet, the accuracy of the overall installation position of each magnet can be judged by checking whether it is in direct contact with the adjacent magnets on both sides.

[0025] 3. By adopting an integral magnetic ring structure with adjacent magnets as the main components, compared with non-directly connected structures, it is possible to install it in one go, and the installation position is more accurate. Attached Figure Description

[0026] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0027] Figure 1 This is a schematic diagram of the brushless motor structure provided by this utility model, showing a portion of the brushless motor structure.

[0028] Figure 2 This is an assembly diagram of the brushless motor structure provided by this utility model.

[0029] Figure 3 This is a schematic diagram of the rotor structure of the brushless motor provided by this utility model.

[0030] Figure 4 This is a schematic diagram of the rotor and magnet of the brushless motor structure provided by this utility model.

[0031] Figure 5 for Figure 4 A magnified view of a portion of the image.

[0032] Figure 6 for Figure 4 A schematic diagram of the individual structure of the medium magnet.

[0033] Figure 7 A schematic diagram of the rotor and the annular integral magnet forming the polygonal magnetic ring of the brushless motor structure provided by this utility model.

[0034] Figure 8 for Figure 7 A magnified view of a portion of the image.

[0035] Figure 9 for Figure 7 A schematic diagram of the individual structure of the medium magnet.

[0036] Figure 10 This is a schematic diagram of a rectangular magnet with adjacent right-angled edges.

[0037] Figure 11 This is a schematic diagram of a rectangular magnet with chamfered edges.

[0038] Figure 12 This is a schematic diagram of a magnet with adjacent side surfaces that are convex arc-shaped.

[0039] Figure 13 This is a schematic diagram of the magnetic properties of adjacent magnets directly coupled together, where the inner sidewall of the rotor is a flat surface.

[0040] Figure 14 This is a schematic diagram of the magnetic properties of adjacent magnets directly connected to each other, with the inner sidewall of the rotor being an arc surface.

[0041] Figure 15 This is a schematic diagram of the magnetic properties of adjacent magnets whose inner sidewalls are flat and are not directly connected.

[0042] Figure 13 , Figure 14 , Figure 15 middle:

[0043] A[Wb / m] represents the magnetic flux per unit length [Webers per meter].

[0044] Br represents the air gap magnetic flux density, in tons (T).

[0045] Curve Info represents curve information; the horizontal axis of the curve represents the circumferential angle, i.e., in degrees.

[0046] RMS indicates the valid value.

[0047] max represents the maximum value.

[0048] The diagram shows:

[0049] Detailed Implementation

[0050] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0051] The brushless motor provided by this utility model includes a housing and a brushless motor structure located within the housing. That is, the brushless motor structure is a part of the brushless motor structure. Figure 1 , Figure 2 As shown, the brushless motor structure includes: a stator 101, a rotor 201, and a motor shaft 2; the stator 101 and the motor shaft 2 are fastened together; the rotor 201 surrounds the stator 101, and the rotor support 7 of the rotor 201 is mounted on the motor shaft 2 through bearings, specifically a first bearing 9 and a second bearing 11, with a retaining ring 10 separating the first bearing 9 and the second bearing 11; the winding 3 of the stator 101 is mounted on the stator core 5 through an upper insulating end plate 4 and a lower insulating end plate 8, and is electrically connected to the lead wire 1, which extends to the outside of the motor shaft 2.

[0052] like Figures 3 to 12 As shown, among the multiple circumferentially arranged flat magnets 6 that are radially inwardly aligned with the mounting surface 71 of the rotor 201 facing the stator 101, adjacent magnets 6 are directly coupled, wherein the direct coupling includes direct contact or being a single integral component. The mounting surface 71 of the rotor 201 facing the stator 101 is a plane that matches the outer surface 62 of the magnet 6, and the plane has no bosses or grooves. The planes provided by the multiple mounting surfaces 71 enclose a polygon. The polygon is a regular polygon.

[0053] The preferred embodiments of this utility model will now be described in more detail with reference to the accompanying drawings.

[0054] In a preferred example, such as Figure 4 , Figure 5 , Figure 6 This illustrates direct contact between adjacent magnets 6. Multiple magnets 6 are independent components; the direct contact refers to the direct contact between adjacent magnets 6 in the circumferential direction after they are abutted against the mounting surface 71.

[0055] More specifically, continuing as Figure 10 , Figure 11 As shown, the magnet 6 is a rectangular magnet, and the edges 610 of the inner surfaces 61 of adjacent magnets 6 are in direct contact; further... Figure 10 For example, the edge 610 refers to the right-angle structure between the inner surface 61 and the side surface 60 of the magnet 6; further... Figure 11For example, the edge 610 refers to the chamfer structure between the inner surface 61 and the side surface 60 of the magnet 6.

[0056] In the variation example, such as Figure 12 As shown, the side surfaces 60 of adjacent magnets 6 are in direct contact; the inner surface 61 of magnet 6 is parallel to the outer surface 62, and the side surface 60 of magnet 6 is a convex arc surface.

[0057] In another preferred example, such as Figure 7 , Figure 8 , Figure 9 The diagram shows that adjacent magnets 6 are connected as a single unit. The direct connection refers to the fact that multiple magnets 6 are always connected as a single ring-shaped component. This single ring-shaped component allows for one-time installation. (Refer to...) Figure 1 , Figure 2 An opening at one axial end of the rotor 201 allows multiple magnets 6 of the integral component to enter the rotor 201 axially and be mounted on the mounting surface 71. This annular structure enters the rotor 201 from the opening and fits against the mounting surface 71 of the magnets. The magnets 6 can be fixed to the mounting surface 71 by adhesive bonding or snap-fitting.

[0058] In more preferred embodiments, among the plurality of circumferentially arranged flat magnets 6 that are radially inwardly attached to the mounting surface 71 of the rotor 201 toward the stator 101, all or some of the side surfaces 60 of adjacent magnets 6 are directly joined together. Alternatively, among the plurality of circumferentially arranged flat magnets 6 that are radially inwardly attached to the mounting surface 71 of the rotor 201 toward the stator 101, all or some of the edges 610 of the inner surfaces 61 of adjacent magnets 6 are directly joined together.

[0059] The following is combined Figure 13 , Figure 14 , Figure 15 The magnetic properties of this utility model will be described.

[0060] Will Figure 13 , Figure 14 , Figure 15 The statistics are as follows:

[0061]

[0062]

[0063] like Figure 13 , Figure 14 As shown, Figure 13 This is a schematic diagram illustrating the magnetic properties of adjacent magnets directly coupled together, where the inner wall of the rotor is a flat surface. Figure 14This diagram illustrates the magnetic properties of adjacent magnets directly bonded together with an inner wall that is curved. The difference lies in whether the inner wall of the rotor is flat or curved. According to the table above, the magnetic properties of adjacent magnets directly bonded together with a flat inner wall are superior to those with a curved inner wall.

[0064] Furthermore, such as Figure 13 , Figure 15 As shown, Figure 13 This is a schematic diagram illustrating the magnetic properties of adjacent magnets directly coupled together, where the inner wall of the rotor is a flat surface. Figure 15 This diagram illustrates the magnetic properties of adjacent magnets on a rotor with a flat inner wall that are not directly bonded. The difference lies in whether the adjacent magnets are directly bonded. According to the table above, the magnetic properties of adjacent magnets directly bonded on a rotor with a flat inner wall are superior to those of adjacent magnets not directly bonded on a rotor with a flat inner wall.

[0065] In summary, simulation experiments show that this invention possesses superior magnetic properties, specifically improvements in the maximum magnetic flux per unit length, the maximum air gap magnetic induction intensity, and the effective value of the air gap magnetic induction intensity. The structure of this invention enables the strongest possible magnetism. Magnetism largely determines the performance of the magnet in practical applications. In motor equipment, higher magnetism means stronger power output, leading to improved motor efficiency and reduced energy consumption.

[0066] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A brushless motor structure, characterized in that, include: Stator (101), rotor (201), motor shaft (2); The stator (101) is fastened to the motor shaft (2); the rotor (201) surrounds the stator (101) and is mounted on the motor shaft (2) via bearings; The winding (3) of the stator (101) is electrically connected to the lead wire (1), which extends to the outside of the motor shaft (2); In a plurality of circumferentially arranged flat magnets (6) that are attached to the mounting surface (71) of the rotor (201) radially inward toward the stator (101), adjacent magnets (6) are directly coupled, wherein the direct coupling includes direct contact or being an integral component.

2. The brushless motor structure according to claim 1, characterized in that, The multiple magnets (6) are independent components. The direct connection refers to the direct contact between adjacent magnets (6) in the circumferential direction after they are attached to the mounting surface (71).

3. The brushless motor structure according to claim 2, characterized in that, The side surfaces (60) of adjacent magnets (6) are in direct contact with each other; the inner surface (61) of the magnet (6) is parallel to the outer surface (62), and the side surface (60) of the magnet (6) is a convex arc surface; Or, The edges (610) of the inner surfaces (61) of adjacent magnets (6) are in direct contact; the magnets (6) are rectangular magnets, and the edges (610) refer to the right-angle structure or chamfer structure between the inner surface (61) and the side surface (60) of the magnets (6).

4. The brushless motor structure according to claim 1, characterized in that, The direct connection refers to the fact that multiple magnets (6) are connected as a whole ring component.

5. The brushless motor structure according to claim 4, characterized in that, An opening at one axial end of the rotor (201) allows multiple magnets (6) of the integral component to enter the rotor (201) axially and be mounted on the mounting surface (71).

6. The brushless motor structure according to claim 1, characterized in that, In the multiple circumferentially arranged flat magnets (6) that are attached to the mounting surface (71) of the rotor (201) in the radial direction towards the stator (101), all or part of the side surfaces (60) of the adjacent magnets (6) are directly joined together. Or, In a plurality of circumferentially arranged flat magnets (6) that are attached to the mounting surface (71) of the rotor (201) radially inward toward the stator (101), the edges (610) of the inner surfaces (61) of all or part of the adjacent magnets (6) are directly joined.

7. The brushless motor structure according to any one of claims 1 to 6, characterized in that, The mounting surface (71) of the rotor (201) facing radially inward toward the stator (101) is a plane that matches the outer surface (62) of the magnet (6).

8. The brushless motor structure according to claim 7, characterized in that, Multiple mounting surfaces (71) provide planes that enclose a polygon.

9. The brushless motor structure according to claim 8, characterized in that, The polygon is a regular polygon.

10. A brushless motor, comprising a housing, characterized in that, It also includes a brushless motor structure located in the housing according to any one of claims 1 to 9.

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