Magnetic steel cementing structure of surface-mounted permanent magnet rotor

Abstract

The utility model discloses a magnetic steel glue joint structure of a surface-mounted permanent magnet rotor, which comprises a rotor iron core formed by laminating a plurality of rotor punching sheets, a plurality of magnetic steel fixing grooves extending along the axis direction are distributed on the periphery of the rotor iron core in a circumferential array manner, and a glue coating groove is arranged on the groove bottom surface of each magnetic steel fixing groove along the length direction. The glue smearing grooves are filled with magnetic steel glue, and under the state that the magnetic steel strips are completely clamped into the magnetic steel fixing grooves, clamping and pressing spaces formed in the glue smearing grooves form glue layers; a glue smearing groove is reserved between the magnetic steel and the iron core, glue makes full contact with the magnetic steel and the iron core, the thickness of a glue layer can be strictly controlled, and consistency is improved.

Description

Technical Field

[0001] The utility model belongs to the field of surface-mounted permanent magnet rotors. Background Technique

[0002] Due to the characteristics of the medium and low speed permanent magnet synchronous motor rotor, such as having a large number of poles, high power factor, high efficiency, large torque density, low speed, and being able to directly drive equipment, partly replacing the speed reducer, it has occupied an important position in the industrial and mining industries in recent years. Among these medium and low speed permanent magnet motors, the surface-mounted magnet process accounts for a large proportion in the rotor part.

[0003] As Figure 1 shown, the traditional surface-mounted process uses magnetic steel glue to be smeared in the magnetic steel fixing groove, and then the magnetic steel is pasted into the magnetic steel groove, and it is very difficult to ensure the thickness of the glue layer between the magnetic steel and the magnetic steel groove; in view of this, it is necessary to develop a magnetic steel + magnetic steel glue surface-mounted process structure that can meet the adhesiveness uniformity and reliability. Summary of the Invention

[0004] Purpose of the Invention: In order to overcome the deficiencies existing in the prior art, the utility model provides a magnetic steel bonding structure for a surface-mounted permanent magnet rotor, in which a glue-smearing groove is reserved between the magnetic steel and the iron core, and the glue is in full contact with the magnetic steel and the iron core, so that the thickness of the glue layer can be strictly controlled and the consistency can be improved.

[0005] Technical Solution: To achieve the above purpose, a magnetic steel bonding structure for a surface-mounted permanent magnet rotor of the utility model includes a rotor iron core formed by laminating a plurality of rotor punching sheets. A plurality of magnetic steel fixing grooves extending along the axial direction are circumferentially and arrayedly distributed on the outer periphery of the rotor iron core. A glue-smearing groove is arranged on the bottom surface of each magnetic steel fixing groove along the length direction. When the magnetic steel strip is completely clamped into the magnetic steel fixing groove, the clamping space formed in the glue-smearing groove constitutes the glue layer.

[0006] Further, there are two parallel and juxtaposed glue-smearing grooves on the bottom surface of each magnetic steel fixing groove.

[0007] Further, the groove depth of the glue-smearing groove is 0.08 mm - 0.12 mm.

[0008] Further, the groove width of the glue-smearing groove is 4.5 mm - 5.5 mm.

[0009] Further, the distance between two adjacent glue-smearing grooves on the bottom surface of the magnetic steel fixing groove is 4.2 mm - 4.7 mm.

[0010] Further, a process fillet is provided at the edge corner of the magnet fixing groove, and process fillets are provided at the edges of both sides of the bottom of the magnet strip. The radius of the process fillet is smaller than the radius of the process fillet. Thus, when the magnet strip is completely clamped into the magnet fixing groove, a crescent-shaped glue layer is formed between the process fillet and the process fillet.

[0011] Further, the glue layer is filled with anaerobic magnet glue.

[0012] Beneficial effects: The present utility model adopts an optimized surface-mounted magnet structure for the rotor. A glue-applying groove is reserved between the magnet and the iron core. The glue is in full contact with the magnet and the iron core, the thickness of the glue layer can be strictly controlled, the consistency is improved, the air void rate is reduced, glue waste is avoided, and the process flow is simplified, thereby reducing the cost of the entire motor; it has positive significance for the mass production of medium- and low-speed surface-mounted permanent magnet motors. Description of the Drawings

[0013] Attached Figure 1 is the magnet fixing groove structure of the existing label-mounted permanent magnet rotor;

[0014] Attached Figure 2 is the axial view of the label-mounted permanent magnet rotor of this solution;

[0015] Attached Figure 3 is the enlarged schematic view of the marked part 1 in the attached Figure 2 ;

[0016] Attached Figure 4 is the dimensional schematic view based on the attached Figure 3 ;

[0017] Attached Figure 5 is the cross-sectional schematic view of the magnet strip;

[0018] Attached Figure 6 is the magnetic field distribution diagram of the magnet glue groove. Specific Embodiments

[0019] The present utility model will be further described below with reference to the drawings.

[0020] As shown in the attached Figure 1The bonding structure of the magnet for the surface-mounted permanent magnet rotor described above includes a rotor core 2 formed by laminating a plurality of rotor punching sheets. A plurality of magnet fixing grooves 6 extending in the axial direction are circumferentially and arrayedly distributed on the outer periphery of the rotor core 2. Glue spreading grooves 8 are provided on the groove bottom surfaces of the magnet fixing grooves 6 along the length direction. Magnet glue is filled in the glue spreading grooves 8. When the magnet strip 9 is completely clamped into the magnet fixing groove 6, the clamping space formed in the glue spreading groove 8 constitutes a glue layer 8a, and anaerobic magnet glue is filled in the glue layer 8a. Process fillets 5 are provided at the edge corners of the magnet fixing groove 6, and process fillets 4 are provided at the edges of the bottom sides of both sides of the magnet strip 9. The radius of the process fillet 5 is smaller than the radius of the process fillet 4. Thus, when the magnet strip 9 is completely clamped into the magnet fixing groove 6, a crescent-shaped glue clamping layer 7 is formed between the process fillet 5 and the process fillet 4.

[0021] The specific magnet pasting process based on the above structure:

[0022] (1) Remove the stamping burrs on the surface of the rotor core 2, and check each magnet fixing groove 6 with a sample block in the same proportion as the magnet strip 9 to ensure the consistency of the magnet fixing grooves 6.

[0023] (2) Clean the surface of the core 2, and use toluene to clean the stamping oil stains on the surface of the core 2 as much as possible. After cleaning, dry the core with a hot air blower.

[0024] (3) Turn one magnet fixing groove 6 of the rotor core 2 upward, and then evenly brush a layer of anaerobic magnet glue in the entire magnet fixing groove 6 with a brush. After brushing, check to see if the glue spreading groove 8 is completely filled with the glue liquid, and make up the brushing in time. Since the glue spreading groove 8 is at the bottom of the magnet fixing groove 6, the anaerobic magnet glue brushed into the bottom of the magnet fixing groove 6 will spontaneously flow into the glue spreading groove 8 under the action of gravity self-leveling, thus ensuring that the glue spreading groove 8 is completely filled.

[0025] (4) Insert the magnetic steel strip 9 into the upward-facing magnetic steel fixing groove 6 along the length direction, and gently tap it with a rubber hammer above and on the side of the magnetic steel strip 9 to prevent hollowing, so that the magnetic steel strip 9 is gradually and completely snapped into the magnetic steel fixing groove 6; in the state where the magnetic steel strip 9 is completely snapped into the magnetic steel fixing groove 6, during the process of gently tapping with the rubber hammer, the remaining glue in the magnetic steel fixing groove 6 is squeezed into the space between the a-process fillet 5 and the b-process fillet 4 and forms a crescent-shaped glue layer 7. The excess glue overflows through both ends of the crescent-shaped glue layer 7 under the action of tapping, thus ensuring that the problem that the magnetic steel strip 9 cannot be or is difficult to be completely embedded in the magnetic steel fixing groove 6 due to excessive glue. At the same time, the crescent-shaped glue layer 7 also plays a role in enhancing the bonding stability of the magnetic steel strip 9; in order to avoid affecting the magnetic field, in this case, the widest part of the crescent-shaped glue layer 7 is around 1 mm. At the same time, when the magnetic steel strip 9 is gradually and completely snapped into the magnetic steel fixing groove 6, the clamping space in the original glue-applying groove 8 forms a glue layer 8a, so that the glue is in full contact with the magnetic steel and the iron core, and the thickness of the glue layer 8a is strictly controlled to improve consistency.

[0026] (5) Depending on the ambient temperature, wait for the magnetic steel glue to cure. It takes 8 hours in summer and 24 hours in winter; after curing, use a stainless steel caliper to measure the outer diameter of the rotor. If there are high points that affect assembly, grind them off.

[0027] As Figure 3 shown, there are two parallel and juxtaposed glue-applying grooves 8 on the bottom surface of each magnetic steel fixing groove 6. In terms of dimensional limits, the depth of the glue-applying groove 8 is 0.08 mm - 0.12 mm; the width of the glue-applying groove 8 is 4.5 mm - 5.5 mm; the distance between two adjacent glue-applying grooves 8 on the bottom surface of the magnetic steel fixing groove 6 is 4.2 mm - 4.7 mm; for specific dimensions, see Figure 1 , the depth of the glue-applying groove 8 is controlled within 8% of the single-sided air gap dimension, and it does not affect the magnetic field of the magnetic steel passing through the iron core. See Figure 6 the magnetic field distribution. It can be seen that the magnetic force lines are evenly distributed inside and outside the glue-applying groove, and the magnetic performance loss can be ignored.

[0028] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A bonding structure of magnets for a surface-mounted permanent magnet rotor, characterized in that, It includes a rotor core (2) formed by laminating a number of rotor laminations. A number of magnet fixing grooves (6) extending in the axial direction are circumferentially and arrayed on the outer periphery of the rotor core (2). Glue applying grooves (8) are arranged on the bottom surfaces of the magnet fixing grooves (6) along the length direction. Magnet glue is filled in the glue applying grooves (8). When the magnet bars (9) are completely clamped into the magnet fixing grooves (6), the clamping space formed in the glue applying grooves (8) constitutes a glue layer (8a).

2. The magnetic steel bonding structure of a surface-mounted permanent magnet rotor according to claim 1, characterized in that: There are two parallel and juxtaposed glue applying grooves (8) on the bottom surfaces of the magnet fixing grooves (6).

3. The magnetic steel bonding structure of a surface-mounted permanent magnet rotor according to claim 1, wherein: The groove depth of the glue applying groove (8) is 0.08 mm - 0.12 mm.

4. The magnetic steel bonding structure of a surface-mounted permanent magnet rotor according to claim 1, characterized in that: The groove width of the glue applying groove (8) is 4.5 mm - 5.5 mm.

5. The magnetic steel bonding structure of a surface-mounted permanent magnet rotor according to claim 2, wherein: The distance between two adjacent glue applying grooves (8) on the bottom surface of the magnet fixing groove (6) is 4.2 mm - 4.7 mm.

6. The bonded structure of the magnet for a surface-mounted permanent magnet rotor according to claim 1, wherein: Process rounded corners a (5) are arranged at the edge corners of the magnet fixing groove (6). Process rounded corners b (4) are arranged at the bottom corners on both sides of the magnet bar (9). The radius of the process rounded corner a (5) is smaller than that of the process rounded corner b (4). Thus, when the magnet bar (9) is completely clamped into the magnet fixing groove (6), a crescent-shaped glue clamping layer (7) is formed between the process rounded corner a (5) and the process rounded corner b (4).

7. The magnetic steel bonding structure of a surface-mounted permanent magnet rotor according to claim 1, wherein: Anaerobic magnet glue is filled in the glue layer (8a).

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