Fixing device for brushless motor rotor

Abstract

The utility model provides a fixing device for a brushless motor rotor, and belongs to the technical field of brushless motors. The motor rotor comprises a rotor shaft sleeved with a rotor core, the rotor shaft is sleeved with a supporting frame abutting against the bottom of the rotor core, the rotor core comprises a plurality of rotor sheets which are of the same structure and are arranged in an overlapped mode, a plurality of installation through holes are evenly distributed in the rotor sheets in the circumferential direction, and longitudinally-arranged magnetic shoes are inserted into the overlapped installation through holes of the rotor sheets. Mounting gaps located on the two sides are formed between the two ends of the magnetic tile and the mounting through holes, U-shaped magnetic block clamps are inserted into the mounting gaps between the two adjacent ends, and the ends of two supporting legs of each magnetic block clamp extend outwards to form abutting parts. The two abutting parts abut against the upper end faces of the magnetic shoes on the two sides respectively, and the supporting frame comprises a plurality of supporting side frames abutting against the bottoms of the magnetic shoes. The magnetic block clamp has the advantages that the magnetic block clamp is simple in structure, the magnetic shoe is convenient to assemble, and the fixing effect is strong.

Description

Technical Field

[0001] This utility model belongs to the field of brushless motor technology, and specifically refers to a fixing device for the rotor of a brushless motor. Background Technology

[0002] In the design and manufacturing of brushless motor rotors, the axial fixation of the magnets is one of the key factors ensuring the reliability of motor operation. For example... Figure 1 As shown, adjacent magnetic tiles in the rotor are typically mechanically positioned using U-shaped magnetic block clamps. Support feet on both sides of the clamps are embedded in the gaps between adjacent magnetic tiles, using their elasticity to restrict movement and prevent slippage. However, mechanical fixation solely by the magnetic block clamps cannot completely solve the vibration problem, as the upper and lower ends of the clamps are prone to axial upward displacement during operation. Therefore, adhesive needs to be injected into the installation gaps of the magnetic block clamps to enhance the stability between the magnetic tiles. However, adhesive application is often done manually, making precise control of the amount applied difficult, or it may require the use of expensive adhesive application machines. Utility Model Content

[0003] The purpose of this invention is to provide a fixing device for the rotor of a brushless motor. It has a simple structure, effectively fixes the magnets on the rotor core without the need for glue application, and is easy to install.

[0004] The purpose of this utility model is achieved as follows:

[0005] A fixing device for a brushless motor rotor includes a rotor shaft fitted with a rotor core, a support frame fitted on the rotor shaft that abuts against the bottom of the rotor core, the rotor core including a plurality of rotor plates with identical and overlapping structures, a plurality of mounting through holes evenly distributed circumferentially on the rotor plates, and longitudinally arranged magnetic tiles inserted into the mounting through holes of the plurality of rotor plates, the two ends of the magnetic tiles forming mounting gaps on both sides, a U-shaped magnetic block clamp inserted into the mounting gaps at adjacent ends, the two support legs of the magnetic block clamp extending outwards to have abutting portions, when the magnetic block clamp is inserted into the mounting gaps at adjacent ends of two sets of mounting through holes, the two abutting portions abut against the upper end surfaces of the magnetic tiles on both sides respectively, and the support frame including a support side frame that abuts against the bottom of the plurality of magnetic tiles.

[0006] The present invention is further configured such that the middle part of the magnetic block clamp support foot forms an arc-shaped side support, and when the magnetic block clamp is installed and used, the outer end of the side support abuts against the side wall of the adjacent magnetic tile.

[0007] The present invention is further configured such that the outer ends of the two support legs of the magnetic block clamp are flared.

[0008] The present invention is further configured such that the two ends of the inner wall of the mounting through hole are provided with limiting protrusions, and when the magnetic tile is installed in the mounting through hole, the magnetic tile is located within the two limiting protrusions.

[0009] The outstanding and beneficial technical effects of this utility model compared to the prior art are:

[0010] 1. The rotor fixing device provided by this utility model has a simple structure. It uses the abutting part of the magnetic block clamp to lock and limit the upper end of the magnetic tile. At the same time, it cooperates with the support side frame at the bottom of the magnetic tile to lock and limit the bottom of the magnetic tile as well, so as to fix the magnetic tile in the axial direction. This method does not require glue application and is convenient to install.

[0011] 2. The present invention further provides a side support in the middle of the magnetic block clamp support corner foot, which allows the side wall of the support foot to have more contact area with the side wall of the magnetic tile when the magnetic block is clamped in the installation gap, thereby further enhancing the fixing effect on the magnetic tile.

[0012] 3. The two support legs of this utility model are flared, which allows the support legs to have greater elastic potential energy, thereby providing better abutment and fixation for the magnetic tiles on both sides.

[0013] 4. The present invention further provides a limiting protrusion in the mounting through hole, which effectively fixes both ends of the magnetic tile, facilitating the installation and fixing of the magnetic block clamp. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a traditional magnetic block clamp;

[0015] Figure 2 This is a schematic diagram of the structure of this utility model. Figure 1 ;

[0016] Figure 3 This is a schematic diagram of the structure of the magnetic block clamp of this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of this utility model. Figure 2 ;

[0018] Figure 5 This is a schematic diagram of the rotor blade structure of this utility model;

[0019] Figure label:

[0020] 1-Rotor core;

[0021] 2-Rotor shaft;

[0022] 3-Support frame; 30-Support side frame;

[0023] 4-Rotor blade; 40-Mounting through hole; 41-Mounting gap; 42-Limiting protrusion;

[0024] 5-Magnetic tile;

[0025] 6-Magnetic block clamp; 60-Abutting part; 61-Side support part. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 2 — Figure 5 :

[0027] A fixing device for a brushless motor rotor includes a rotor shaft 2 on which a rotor core 1 is fitted. A support frame 3 is fitted on the rotor shaft 2 and abuts against the bottom of the rotor core 1. The rotor core 1 includes a plurality of rotor plates 4 with the same structure and arranged in an overlapping manner. A plurality of mounting through holes 40 are evenly distributed circumferentially on the rotor plates 4. A longitudinally arranged magnetic tile 5 is inserted into the mounting through holes 40 of the plurality of rotor plates 4. The two ends of the magnetic tile 5 form mounting gaps 41 on both sides between the mounting through holes 40. A U-shaped magnetic block clamp 6 is inserted into the mounting gaps 41 at adjacent ends. The two support legs of the magnetic block clamp 6 extend outward with abutment portions 60. When the magnetic block clamp 6 is inserted into the mounting gaps 41 at adjacent ends of two sets of mounting through holes 40, the two abutment portions 60 abut against the upper end surfaces of the magnetic tiles 5 on both sides. The support frame 3 includes a support side frame 30 that abuts against the bottom of the plurality of magnetic tiles 5.

[0028] During installation, several overlapping rotor plates create interconnected mounting cavities through the mounting holes 40. The magnetic block clamp is inserted between two adjacent mounting cavities, and then the magnetic tile is inserted from the bottom of the mounting cavity. The top ends of the inserted magnetic tile are abutted by the support legs of the magnetic block clamps 6 on both sides, preventing the magnetic tile from detaching from the top. Similarly, the two sides of the magnetic tile are also abutted by the two support legs of the magnetic block clamps 6, holding the magnetic tile in the middle of the mounting holes 40. Further, several rotor plates 4, containing the magnetic tiles and magnetic block clamps 6, are placed on the rotor shaft 2, and the bottom of the rotor shaft is fitted with the support frame 3. The support side frames on the support frame abut against the bottom of each magnetic tile, preventing the magnetic tile from detaching from the bottom. The magnetic tile is fully fixed within the mounting holes, requiring no adhesive and making installation very convenient.

[0029] It is worth mentioning that a locking bearing is fitted on the rotor shaft 2, and the bearing is located at the lower end of the support frame 3 and above the rotor core, so as to achieve axial fixation of the bottom of the support frame and axial fixation of the bottom of the rotor core.

[0030] Preferably, the middle part of the support leg of the magnetic block clamp 6 forms an arc-shaped side support 61, and when the magnetic block clamp 6 is installed and used, the outer end of the side support 61 abuts against the side wall of the adjacent magnetic tile 5.

[0031] In the above structure, the side support 61 can increase the contact area with the side wall of the magnetic tile, thereby providing a better effect for the abutment and fixation of the two sides of the magnetic tile.

[0032] Preferably, the outer ends of the two support legs of the magnetic block clamp 6 are flared. The flared magnetic block clamp 6 allows the support legs to have greater elastic potential energy during deformation, thereby providing a stronger abutment and fixation effect on both sides of the magnetic tile.

[0033] Preferably, the inner wall of the mounting through hole 40 is provided with limiting protrusions 42 at both ends. When the magnetic tile 5 is installed in the mounting through hole 40, the magnetic tile 5 is located within the two limiting protrusions 42.

[0034] In the above structure, the limiting protrusion 42 can keep the magnetic tile inside the mounting through hole, and when the magnetic block clamp 6 on one side is elastic, it can also keep the magnetic tile in the middle of the mounting through hole, thus achieving a good limiting effect.

[0035] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A fixing device for a brushless motor rotor, comprising a rotor shaft (2) on which a rotor core (1) is sleeved, and a support frame (3) on the rotor shaft (2) abutting against the bottom of the rotor core (1), characterized in that, The rotor core (1) includes several rotor plates (4) with the same structure and overlapping arrangement. Several mounting through holes (40) are evenly distributed around the rotor plates (4). A longitudinally arranged magnetic tile (5) is inserted into the mounting through holes (40) of the several rotor plates (4). The two ends of the magnetic tile (5) form a mounting gap (41) on both sides between the mounting through holes (40). A U-shaped magnetic block clamp (6) is inserted into the mounting gap (41) at the adjacent ends. The two support legs of the magnetic block clamp (6) extend outward with abutment parts (60). When the magnetic block clamp (6) is inserted into the mounting gap (41) at the adjacent ends of two sets of mounting through holes (40), the two abutment parts (60) abut against the upper end surfaces of the magnetic tiles (5) on both sides respectively. The support frame (3) includes a support side frame (30) that abuts against the bottom of several magnetic tiles (5).

2. The fixing device for a brushless motor rotor according to claim 1, characterized in that, The magnetic block clamp (6) has an arc-shaped side support (61) in the middle of its support leg, and when the magnetic block clamp (6) is installed and used, the outer end of the side support (61) abuts against the side wall of the adjacent magnetic tile (5).

3. A fixing device for a brushless motor rotor according to claim 1 or 2, characterized in that, The outer ends of the two support legs of the magnetic block clamp (6) are flared.

4. A fixing device for a brushless motor rotor according to claim 1 or 2, characterized in that, The inner wall of the mounting through hole (40) is provided with limiting protrusions (42) at both ends. When the magnetic tile (5) is installed in the mounting through hole (40), the magnetic tile (5) is located in the two limiting protrusions (42).

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