Outer rotor brushless motor rotor magnet fixing structure

Abstract

The utility model discloses a rotor magnet fixing structure of an outer rotor brushless motor, and relates to the technical field of magnet fixing. The motor comprises an outer rotor and a stator matched with the outer rotor, the outer rotor comprises an upper end cover and a rotating shaft connected with the upper end cover, a fixing frame is glued to the circumferential side of the inner wall of the upper end cover, and a plurality of permanent magnets are glued to the side portion of the upper end cover; the fixing frame comprises a circular ring, a plurality of spacing plates and a plurality of connecting arc plates are arranged on the side portion of the circular ring, the connecting arc plates are arranged between every two adjacent spacing plates, the thickness of the spacing plates is larger than that of the connecting arc plates, the spacing plates are glued to the side portion of the inner wall of the upper end cover, and the permanent magnets are glued to one sides of the connecting arc plates and between every two adjacent spacing plates. According to the utility model, the permanent magnets are arranged between the two adjacent spacing plates, so that the distances between the two adjacent permanent magnets are equal, and the permanent magnets are equally divided into angles and distances, so that the electromagnetic sound is reduced, and the probability of generating abnormal sound is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of magnet fixation, and specifically relates to a rotor magnet fixation structure for an outer-rotor brushless motor. Background Art

[0002] At present, in the industry of outer-rotor structures of brushless motors, sintered magnets are directly fixed in the rotor housing. The disadvantages of this design are that it is difficult to control the equal division of angles and distances for each magnet, resulting in a large electromagnetic noise and abnormal noise in the motor. Moreover, the bonding strength between the magnet and the rotor housing is relatively small. When the load is relatively large, the rotor magnet will become loose from the rotor housing. The disadvantages are as follows:

[0003] 1. Heavy electromagnetic noise and abnormal noise are generated.

[0004] 2. The bonding strength between the magnet and the rotor housing is small, resulting in the detachment of the rotor magnet. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a rotor magnet fixation structure for an outer-rotor brushless motor.

[0006] To solve the above technical problem, the basic concept of the technical solution adopted by the utility model is:

[0007] A rotor magnet fixation structure for an outer-rotor brushless motor includes an outer rotor and a stator adapted to the outer rotor. The outer rotor includes an upper end cover and a rotating shaft connected to the upper end cover. A fixing frame is adhesively bonded to the circumferential side of the inner wall of the upper end cover, and a plurality of permanent magnets are adhesively bonded to the side portion.

[0008] The fixing frame includes a ring. A plurality of spacer plates and a plurality of connecting arc plates are provided on the side of the ring. The connecting arc plates are arranged between adjacent two spacer plates. The thickness of the spacer plates is greater than that of the connecting arc plates. The spacer plates are adhesively bonded to the side portion of the inner wall of the upper end cover, and the permanent magnets are adhesively bonded between one side of the connecting arc plates and adjacent two spacer plates, thereby increasing the bonding area of the permanent magnets.

[0009] Optionally, the stator includes a machine base located on the circumferential side of the rotating shaft. The machine base is in threaded fit with a lower end cover at one end of the upper end cover. A core is clamped on the circumferential side of the machine base. The core is located inside the upper end cover, and the permanent magnets are located on the side of the core. The stator can be positioned and installed through the machine base.

[0010] Optionally, a first bearing and a second bearing are provided on the circumferential side of the inner wall of the machine base. Both the first bearing and the second bearing are arranged on the circumferential side of the rotating shaft. The second bearing is located between the first bearing and the upper end cover, thereby reducing the friction between the rotating shaft and the machine base during rotation.

[0011] Optionally, a gasket is sleeved on the periphery of the rotating shaft and a nut is in threaded fit therewith. Both the gasket and the nut are located inside the machine base. The gasket is located between the first bearing and the nut, and the first bearing is located between the second bearing and the gasket. The outer rotor and the stator are connected by the nut.

[0012] Optionally, one end of the machine base adjacent to the upper end cover is provided with a circuit board and is provided with a plurality of second screw holes. The circuit board is horizontally provided with through holes corresponding to the second screw holes one by one. The through holes penetrate through the circuit board. Screws are provided on the circuit board, one end of which penetrates through the through holes and is in threaded fit in the second screw holes. The circuit board and the machine base can be assembled and disassembled through the screws.

[0013] Optionally, a strip-shaped protrusion is provided on the side of the machine base, and a positioning groove adapted to the strip-shaped protrusion is provided on the inner wall side of the iron core. The positioning groove horizontally penetrates through the iron core, thereby reducing the probability of rotational misalignment between the iron core and the machine base.

[0014] After adopting the above technical solutions, the present utility model has the following beneficial effects compared with the prior art. Of course, any product implementing the present utility model does not necessarily need to achieve all the advantages described below at the same time:

[0015] By placing the permanent magnet between two adjacent spacer plates, the distance between two adjacent permanent magnets is made equal, and a plurality of permanent magnets evenly divide the angle and the distance, thereby reducing the electromagnetic sound and the probability of generating abnormal sound. By adhesively bonding three sides of the periphery of the permanent magnet to one side of the connecting arc plate and between two adjacent spacer plates respectively, the adhesive area of the permanent magnet is increased, the adhesive strength of the permanent magnet is improved, and the risk of the permanent magnet falling off is reduced.

[0016] The following further describes in detail the specific embodiments of the present utility model with reference to the accompanying drawings. Description of the Drawings

[0017] The following drawings in the description are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0018] Figure 1 is a three-dimensional structural schematic diagram of an embodiment of the present utility model;

[0019] Figure 2 is a sectional structural schematic diagram of an embodiment of the present utility model;

[0020] Figure 3 is an exploded effect structural schematic diagram of an embodiment of the present utility model.

[0021] In the drawings, the list of components represented by each reference numeral is as follows:

[0022] Base 1, lower end cover 2, first bearing 3, second bearing 4, circuit board 5, iron core 6, upper end cover 7, rotating shaft 8, gasket 9, nut 10, ring 11, spacer 1101, connecting arc plate 1102, permanent magnet 12.

[0023] It should be noted that these drawings and text descriptions are not intended to limit the scope of the concept of the present utility model in any way, but to illustrate the concept of the present utility model to those skilled in the art by referring to specific embodiments. Specific embodiments

[0024] Now, the present utility model will be further described in detail with reference to the accompanying drawings.

[0025] Please refer to Figures 1-3 As shown, in this embodiment, a fixing structure for the rotor magnets of an outer-rotor brushless motor is provided, which includes an outer rotor and a stator adapted to the outer rotor. The outer rotor includes an upper end cover 7 and a rotating shaft 8 connected to the upper end cover 7. A fixing frame is adhesively bonded to the circumferential side of the inner wall of the upper end cover 7, and a plurality of permanent magnets 12 are adhesively bonded to the side portion.

[0026] The fixing frame includes a ring 11. A plurality of spacers 1101 and a plurality of connecting arc plates 1102 are provided on the side of the ring 11. The ring 11, the spacers 1101, and the connecting arc plates 1102 are integrally formed structures. The connecting arc plates 1102 are arranged between two adjacent spacers 1101. The thickness of the spacers 1101 is greater than the thickness of the connecting arc plates 1102. The spacers 1101 are adhesively bonded to the side portion of the inner wall of the upper end cover 7, and the permanent magnets 12 are adhesively bonded to one side of the connecting arc plates 1102 and between two adjacent spacers 1101, thereby increasing the adhesive area of the permanent magnets 12.

[0027] One application aspect of this embodiment is as follows: When assembling the outer rotor, first apply glue on the outer surface of the spacers 1101, place the fixing frame in the upper end cover 7, and use the glue to paste and fix the fixing frame on the circumferential side of the inner wall of the upper end cover 7. Then apply glue on the back and three adjacent sides of the permanent magnets 12, place them in the upper end cover 7, paste the back of the permanent magnets 12 on the side portion of the inner wall of the upper end cover 7 that is fixed, and paste the three adjacent sides of the permanent magnets 12 on one side of the connecting arc plates 1102 and between two adjacent spacers 1101 respectively. Thus, the equal-distance distribution of a plurality of permanent magnets 12 is realized by using the spacers 1101, and the permanent magnets 12 are positioned and installed in cooperation with the connecting arc plates 1102. Finally, the excess glue is removed.

[0028] As Figure 2As shown, the stator of this embodiment includes a frame 1 located on the circumferential side of the rotating shaft 8. A lower end cover 2 is threadedly engaged with the circumferential side of the frame 1. The lower end cover 2 is located at one end of the upper end cover 7. A core 6 is snap-fitted to the circumferential side of the frame 1. A three-phase winding is wound around the core 6. The core 6 is located inside the upper end cover 7. A permanent magnet 12 is located on the side of the core 6. Multiple first screw holes are provided at one end of the frame 1 away from the upper end cover 7. The frame 1 can be positioned and installed through the first screw holes, so as to install the outer-rotor brushless motor on the required structure or equipment.

[0029] As Figure 2 , 3 shown, on the circumferential side of the inner wall of the frame 1 of this embodiment, a first bearing 3 and a second bearing 4 are provided. Both the first bearing 3 and the second bearing 4 are provided on the circumferential side of the rotating shaft 8. The second bearing 4 is located between the first bearing 3 and the upper end cover 7. The friction between the rotating shaft 8 and the frame 1 during rotation is reduced through the first bearing 3 and the second bearing 4.

[0030] As Figure 2 , 3 shown, a gasket 9 is sleeved on the circumferential side of the rotating shaft 8 of this embodiment, and a nut 10 is threadedly engaged. Both the gasket 9 and the nut 10 are located inside the frame 1. The gasket 9 is located between the first bearing 3 and the nut 10. The first bearing 3 is located between the second bearing 4 and the gasket 9. The diameter of the gasket 9 is smaller than the inner diameter of the outer ring of the first bearing 3, so as to reduce the probability of contact between the gasket 9 and the outer ring of the first bearing 3. The nut 10 is used to squeeze the gasket 9 to fit the inner ring of the first bearing 3. Similarly, the contact part between the outer rotor and the second bearing 4 is also arranged in the same way, so as to ensure that the rotation of the rotating shaft 8 drives the gasket 9 and the nut 10 to rotate synchronously, and the nut 10 is used to connect the outer rotor and the stator.

[0031] As Figure 3 shown, one end of the frame 1 adjacent to the upper end cover 7 of this embodiment is provided with a circuit board 5 and multiple second screw holes. The circuit board 5 is located on the circumferential side of the second bearing 4. The core 6 is located on the circumferential side of the circuit board 5. The circuit board 5 is horizontally provided with through holes corresponding to the second screw holes one by one. The through holes penetrate through the circuit board 5. Screws are provided on the circuit board 5, one end of which penetrates through the through holes and is threadedly engaged in the second screw holes. The circuit board 5 and the frame 1 can be assembled and disassembled through the screws.

[0032] As Figure 3 shown, a strip-shaped protrusion is provided on the side of the frame 1 of this embodiment. A positioning groove adapted to the strip-shaped protrusion is provided on the side of the inner wall of the core 6. The positioning groove horizontally penetrates through the core 6. The strip-shaped protrusion is snap-fitted in the positioning groove. The positioning and installation of the core 6 can be realized through the strip-shaped protrusion, and the probability of rotational misalignment between the core 6 and the frame 1 is prevented.

[0033] There are many connection structures between the fixing frame and the upper end cover 7. Two optional implementation manners are provided in this embodiment.

[0034] Embodiment 1: The fixing bracket and the upper end cover 7 are an integrally formed structure;

[0035] Embodiment 2: The spacer 1101 is welded to the inner wall side of the upper end cover 7;

[0036] Through the above two embodiments, the connection stability between the fixing bracket and the upper end cover 7 is further improved.

[0037] The present utility model is not limited to the above embodiments. Anyone should know that structural changes made under the inspiration of the present utility model, as long as they have the same or similar technical solutions as the present utility model, fall within the protection scope of the present utility model. The technologies, shapes, and structures not detailedly described in the present utility model are all well-known technologies.

Claims

1. A fixed structure for rotor magnets of an outer rotor brushless motor, characterized in that, Comprising: An outer rotor and a stator adapted to the outer rotor. The outer rotor includes an upper end cover (7) and a rotating shaft (8) connected to the upper end cover (7). A fixing frame is adhesively bonded to the circumferential side of the inner wall of the upper end cover (7), and a plurality of permanent magnets (12) are adhesively bonded to the side portion. The fixing frame includes a ring (11). A plurality of spacer plates (1101) and a plurality of connecting arc plates (1102) are provided on the side of the ring (11). The connecting arc plates (1102) are arranged between two adjacent spacer plates (1101). The thickness of the spacer plates (1101) is greater than that of the connecting arc plates (1102). The spacer plates (1101) are adhesively bonded to the side portion of the inner wall of the upper end cover (7), and the permanent magnets (12) are adhesively bonded to one side of the connecting arc plates (1102) and between two adjacent spacer plates (1101).

2. The rotor magnet fixing structure of an outer rotor brushless motor according to claim 1, wherein The stator includes a machine base (1) located on the circumferential side of the rotating shaft (8). A lower end cover (2) is in threaded fit with the circumferential side of the machine base (1). A core (6) is clamped to the circumferential side of the machine base (1). The permanent magnets (12) are located on the side of the core (6).

3. The rotor magnet fixing structure of an outer rotor brushless motor according to claim 2, characterized in that, A first bearing (3) and a second bearing (4) are provided on the circumferential side of the inner wall of the machine base (1). Both the first bearing (3) and the second bearing (4) are arranged on the circumferential side of the rotating shaft (8).

4. The rotor magnet fixing structure of an outer rotor brushless motor according to claim 3, characterized in that, A gasket (9) is sleeved on the circumferential side of the rotating shaft (8), and a nut (10) is in threaded fit. The gasket (9) is located between the first bearing (3) and the nut (10).

5. The rotor magnet fixing structure of an outer rotor brushless motor according to claim 2, characterized in that One end of the machine base (1) adjacent to the upper end cover (7) is provided with a circuit board (5) having a plurality of second screw holes. The circuit board (5) is horizontally provided with through holes corresponding to the second screw holes one by one. Screws are provided on the circuit board (5) with one end passing through the through holes and being in threaded fit in the second screw holes.

6. The rotor magnet fixing structure of an outer rotor brushless motor according to claim 2, characterized in that, A strip-shaped protrusion is provided on the side of the machine base (1). A positioning groove adapted to the strip-shaped protrusion is provided on the side portion of the inner wall of the core (6).

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