An anti-oxidation neodymium-iron-boron permanent magnet assembly and a preparation method thereof

Abstract

This invention relates to the field of generator technology and discloses an antioxidant NdFeB permanent magnet assembly and its preparation method, comprising a shell, several permanent magnet bodies, and a rotor; the inner cavity of the shell is provided with a connecting structure for connecting the permanent magnet bodies, the connecting structure including a fixing ring fixedly connected inside the shell; the surface of the fixing ring is provided with an adjustment structure for driving the permanent magnet bodies to contract and swing to disturb airflow for heat dissipation; the adjustment structure includes two mounting plates symmetrically fixedly connected to the surface of the fixing ring. This invention uses the reciprocating swing of the permanent magnet bodies, which can effectively disturb the airflow inside the shell cavity, breaking the heat accumulation problem caused by traditional adhesive fixing, accelerating the heat exchange between the hot airflow and the inner wall of the metal shell, avoiding the magnetic performance decay of the permanent magnet bodies due to local high temperature, and at the same time eliminating the need for the motor to consume additional electrical energy to maintain output power, ensuring the stability of the energy efficiency level of the energy-saving motor.

Description

Technical Field

[0001] This invention relates to the field of generator technology, specifically to an antioxidant neodymium iron boron permanent magnet assembly and its preparation method. Background Technology

[0002] Neodymium iron boron (NdFeB) permanent magnets, with their ultra-high energy product, high coercivity, and excellent energy conversion efficiency, have become the core functional component of energy-saving electric motors. Energy-saving electric motors achieve low-loss conversion between magnetic energy and mechanical energy through the efficient magnetic field constructed by NdFeB permanent magnets. The achievement of their energy efficiency level is highly dependent on the magnetic performance stability, heat dissipation efficiency, and environmental corrosion resistance of the permanent magnet components. Currently, energy-saving electric motors are widely used in industrial drives, new energy vehicle drive systems, smart home appliances, and other fields. The market's requirements for the sustainability of their operating energy efficiency, the extension of their service life, and the adaptability to operating conditions are constantly increasing, which directly puts forward more stringent performance standards for the matching NdFeB permanent magnet components. In the assembly process of energy-saving electric motors, the method of fixing neodymium iron boron permanent magnets to the motor housing (or rotor core housing) is a key factor affecting the performance of the components. In the existing technology, the industry generally uses thermosetting and photocuring adhesives such as epoxy glue, AB glue or UV glue to directly glue and fix neodymium iron boron permanent magnets to the inner ring of the housing. This process has long occupied the mainstream application position because of its simple operation process, low assembly cost, good sealing effect in the short term, and ability to isolate external dust and moisture from direct contact with permanent magnets to a certain extent. It temporarily meets the initial assembly needs of low power density energy-saving motors. However, with the development of energy-saving motors, the technical defects of the traditional adhesive fixing method have become increasingly prominent. Since the permanent magnet and the shell are rigidly fixed, the permanent magnet remains stationary during the operation of the energy-saving motor and cannot adapt to changes in the airflow field inside the motor. When the energy-saving motor is running at high power, the permanent magnet will generate a lot of heat due to hysteresis loss and eddy current loss. The stationary permanent magnet cannot disturb the airflow in the inner ring of the shell, resulting in the formation of a "heat accumulation zone" on the surface of the permanent magnet and inside the shell. The local high temperature will not only significantly reduce the coercivity and remanence of the neodymium iron boron permanent magnet, but also disrupt the energy conversion balance inside the motor, forcing the motor to consume additional electrical energy to maintain the output power, which directly leads to a reduction in the energy efficiency level of the energy-saving motor. In view of this, the present invention solves the above-mentioned technical problems by proposing an antioxidant neodymium iron boron permanent magnet component and its preparation method. Summary of the Invention

[0003] To address the shortcomings of the aforementioned background technology, this invention provides a technical solution for an antioxidant NdFeB permanent magnet assembly and its preparation method. An adjusting plate drives an extrusion block to slide along a guide groove in the inner cavity of a swing plate. The extrusion block then pushes the swing plate to rotate around a pin on a mounting plate. The swing plate, via connecting block a, drives a connecting rod to move. The connecting rod, via connecting block b, drives an extrusion ring closer to the permanent magnet body, causing the permanent magnet body to contract and swing along the arc surface of the limiting groove of the connecting rod. Simultaneously, the connecting rod causes the elastic element b to deform and store potential energy. After the adjusting plate is adjusted in the opposite direction, the elastic element a pushes the extrusion block to reset, and the elastic element b drives the connecting rod to reset, thereby resetting the permanent magnet body, forming a reciprocating swing. This swing effectively disturbs the airflow within the outer shell, breaking the heat accumulation problem caused by traditional adhesive fixing, accelerating the heat exchange between the hot airflow and the inner wall of the metal outer shell, preventing the permanent magnet body from experiencing magnetic performance decay due to localized high temperatures. Furthermore, it eliminates the need for an additional motor to consume electrical energy to maintain output power, ensuring the stable energy efficiency rating of the energy-saving motor.

[0004] This invention provides the following technical solution: an antioxidant neodymium iron boron permanent magnet assembly and its preparation method, comprising a shell, several permanent magnet bodies, and a rotor; The inner cavity of the outer shell is provided with a connecting structure for connecting the permanent magnet body, the connecting structure including a fixing ring fixedly connected inside the outer shell; The surface of the fixed ring is provided with an adjustment structure for driving the permanent magnet body to contract and swing to disturb the airflow for heat dissipation. The adjustment structure includes two mounting plates symmetrically fixed to the surface of a fixed ring. Each mounting plate has a swing plate rotatably connected to its surface via a pin. A pressing block is slidably connected to the inner cavity of the swing plate. An adjustment plate is rotatably connected to the surface of the pressing block via a pin. A sliding groove is formed through the surface of each mounting plate and the surface of the adjustment plate. A connecting pin is slidably connected to the inner cavity of the sliding groove. An elastic element a is provided between the pressing block and the inner wall of the swing plate.

[0005] As a preferred embodiment of the present invention, the adjustment structure further includes two connecting blocks a symmetrically fixedly connected to both sides of each swing plate. The inner cavity of each connecting block a is rotatably connected to a connecting rod via a pin. The end of each connecting rod away from the connecting block a is rotatably connected to a connecting block b via a pin. The surface of the connecting block b is fixedly connected to a compression ring for driving the permanent magnet body to contract and swing.

[0006] As a preferred embodiment of the present invention, the connection structure further includes a plurality of connecting blocks c fixedly connected to both ends of the fixed ring. The inner cavity of each connecting block c is rotatably connected to a connecting rod via a pin. Each connecting rod has a symmetrically formed limiting groove for mounting a permanent magnet body on its surface. Each permanent magnet body is slidably connected to the surface of the corresponding limiting groove. An elastic element b for providing a reset spring force is sleeved on the pin surface of the connecting rod.

[0007] As a preferred embodiment of the present invention, the surface of the outer shell is provided with two sealing shells for sealing and protection, the rotor is located inside the fixed ring, and the rotor shaft is rotatably connected to the inner cavity of the sealing shell.

[0008] As a preferred embodiment of the present invention, the surface of the connecting pin is threaded with a knob for locking and fixing, the surface of the knob is provided with anti-slip texture, and the surface of the outer shell is provided with a relief groove, the position of the relief groove being adapted to the position of the adjusting plate.

[0009] As a preferred embodiment of the present invention, the number of extrusion rings is two and they are symmetrically distributed. The extrusion rings are hollow frustum structures, and the permanent magnet body is adapted to be installed on the inner side of the extrusion rings.

[0010] As a preferred embodiment of the present invention, the elastic element a is a compression spring, and the two ends of the elastic element a are fixedly connected to the inner wall of the swing plate and the surface of the extrusion block, respectively, and the elastic element b is a torsion spring.

[0011] As a preferred technical solution of the present invention, S1, assembling the adjustment structure and the fixing ring: the mounting plate, the swing plate, the pressing block, the elastic element a, the adjustment plate and the connecting pin are assembled in sequence to form the adjustment structure, and then the adjustment structure is fixed to the surface of the fixing ring. S2. Fixing the fixing ring to the outer shell: Fix the fixing ring of the assembled adjustment structure to the inner wall of the outer shell, ensuring that the axes of the two coincide; S3. Install the permanent magnet body connecting components: Fix the connecting blocks c at both ends of the fixing ring, assemble the connecting rod and elastic element b, and then install the permanent magnet body into the limiting groove of the connecting rod accordingly. S4. Assemble the rotor and sealing shell: Place the rotor into the fixing ring, and embed the sealing shell at both ends of the outer shell to make the rotor shaft and the sealing shell rotatably connected, thus completing the component preparation.

[0012] Compared with the prior art, the present invention has the following beneficial effects: This invention uses an adjusting plate to drive an extrusion block to slide along a guide groove inside a swing plate. The extrusion block then pushes the swing plate to rotate around a pin on a mounting plate. The swing plate drives a connecting rod to move via a connecting block a. The connecting rod then drives an extrusion ring to approach the permanent magnet body via a connecting block b. This causes the permanent magnet body to contract and swing along the arc surface of the limiting groove of the connecting rod. At the same time, the connecting rod causes the elastic element b to deform and store potential energy. After the adjusting plate is adjusted in the opposite direction, the elastic element a pushes the extrusion block to reset, and the elastic element b drives the connecting rod to reset, which in turn drives the permanent magnet body to reset, forming a reciprocating swing. This swing can effectively disturb the airflow inside the outer shell, breaking the heat accumulation problem caused by traditional adhesive fixation, accelerating the heat exchange between the hot airflow and the inner wall of the metal outer shell, and preventing the permanent magnet body from losing magnetic properties due to local high temperature. At the same time, it eliminates the need for the motor to consume additional electrical energy to maintain output power, ensuring the stable energy efficiency level of the energy-saving motor.

[0013] During the resetting process of the permanent magnet body of the present invention, the resetting force of the elastic element b causes the permanent magnet body to vibrate instantaneously, which can shake off the dust attached to its surface, avoid dust accumulation affecting the magnetic permeability and heat dissipation efficiency of the permanent magnet body, further ensure the stability of the permanent magnet assembly and extend its service life. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 For the present invention Figure 1 A sectional view; Figure 3 For the present invention Figure 1 Disassembly diagram; Figure 4 For the present invention Figure 3 Disassembly diagram; Figure 5 This is a schematic diagram of the extrusion ring structure of the present invention; Figure 6 This is a schematic diagram of the swing plate structure of the present invention; Figure 7 This is a schematic diagram of the rotor structure of the present invention; Figure 8 This is a schematic diagram of the permanent magnet body structure of the present invention.

[0015] In the diagram: 1. Outer shell; 101. Permanent magnet body; 102. Rotor; 2. Fixing ring; 3. Mounting plate; 301. Swing plate; 302. Extrusion block; 303. Adjusting plate; 304. Sliding groove; 305. Connecting pin; 306. Elastic element a; 4. Connecting block a; 401. Connecting rod; 402. Connecting block b; 403. Extrusion ring; 5. Connecting block c; 501. Connecting rod; 502. Limiting groove; 503. Elastic element b; 6. Sealing shell; 7. Knob; 701. Anti-slip texture; 702. Relief groove. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see Figures 1-8 As shown, an antioxidant neodymium iron boron permanent magnet assembly and its preparation method are disclosed, comprising a shell 1, a plurality of permanent magnet bodies 101 and a rotor 102; The inner cavity of the outer shell 1 is provided with a connection structure for connecting the permanent magnet body 101. The connection structure includes a fixing ring 2 fixedly connected inside the outer shell 1. The surface of the fixed ring 2 is provided with an adjustment structure for driving the permanent magnet body 101 to contract and swing to disturb the airflow for heat dissipation; The adjustment structure includes two mounting plates 3 symmetrically fixed to the surface of the fixed ring 2. Each mounting plate 3 has a swing plate 301 rotatably connected to its surface via a pin. The inner cavity of the swing plate 301 is slidably connected to a pressing block 302. The surface of the pressing block 302 is rotatably connected to an adjustment plate 303 via a pin. A sliding groove 304 is provided through the surface of each mounting plate 3 and the surface of the adjustment plate 303. A connecting pin 305 is slidably connected to the inner cavity of the sliding groove 304. An elastic element a306 is provided between the pressing block 302 and the inner wall of the swing plate 301.

[0018] The adjustment structure also includes two connecting blocks a4 symmetrically fixedly connected to both sides of each swing plate 301. The inner cavity of each connecting block a4 is rotatably connected to a connecting rod 401 via a pin. The end of each connecting rod 401 away from the connecting block a4 is rotatably connected to a connecting block b402 via a pin. The surface of the connecting block b402 is fixedly connected to a compression ring 403 for driving the permanent magnet body 101 to contract and swing.

[0019] The connection structure also includes multiple connecting blocks c5 fixedly connected to both ends of the fixed ring 2. The inner cavity of each connecting block c5 is rotatably connected to a connecting rod 501 via a pin. Each connecting rod 501 has a symmetrically provided limiting groove 502 for installing the permanent magnet body 101 on its surface. Each permanent magnet body 101 is slidably connected to the surface of the corresponding limiting groove 502. The pin surface of the connecting rod 501 is fitted with an elastic element b503 for providing a reset spring force.

[0020] The surface of the outer casing 1 is fitted with two sealing shells 6 for sealing and protection. The rotor 102 is located inside the fixed ring 2, and the shaft of the rotor 102 is rotatably connected to the inner cavity of the sealing shell 6.

[0021] The connecting pin 305 has a threaded connection to a knob 7 for locking and fixing. The surface of the knob 7 has anti-slip texture 701, and the surface of the housing 1 has a relief groove 702. The position of the relief groove 702 is adapted to the position of the adjusting plate 303.

[0022] There are two extrusion rings 403, which are symmetrically distributed. The extrusion ring 403 has a hollow frustum structure, and the permanent magnet body 101 is adapted to be installed on the inner side of the extrusion ring 403.

[0023] The elastic element a306 is a compression spring, and its two ends are fixedly connected to the inner wall of the swing plate 301 and the surface of the extrusion block 302, respectively. The elastic element b503 is a torsion spring.

[0024] S1. Assemble the adjustment structure and fixing ring 2: Assemble the mounting plate 3, swing plate 301, pressing block 302, elastic element a306, adjustment plate 303 and connecting pin 305 in sequence to form the adjustment structure, and then fix the adjustment structure to the surface of the fixing ring 2. S2. Fixing the fixing ring 2 and the outer shell 1: Fix the fixing ring 2, which has been assembled with the adjustment structure, to the inner wall of the outer shell 1, ensuring that the axes of the two coincide; S3. Install the connecting parts of the permanent magnet body 101: Fix the connecting blocks c5 at both ends of the fixing ring 2, assemble the connecting rod 501 and the elastic element b503, and then install the permanent magnet body 101 in the limiting groove 502 of the connecting rod 501. S4. Assemble the rotor 102 and the sealing shell 6: Place the rotor 102 into the fixing ring 2, and embed the sealing shell 6 into both ends of the outer shell 1, so that the rotor 102 shaft is rotatably connected to the sealing shell 6, thus completing the component preparation.

[0025] First, assemble the core components of the adjustment structure with the fixed ring 2. Two mounting plates 3 are symmetrically fixed to the outer circumferential surface of the fixed ring 2 (symmetrically distributed along the axial direction of the fixed ring 2). Each mounting plate 3 has a pre-set pin hole. Insert the pin at one end of the swing plate 301 into the pin hole of the mounting plate 3 to ensure that the swing plate 301 can rotate freely around the pin. Then, insert the extrusion block 302 into the inner cavity of the swing plate 301 (the inner cavity of the swing plate 301 has a rectangular guide groove to restrict the extrusion block 302 to slide only along the axial direction of the guide groove), and... An elastic element a306 is installed between the extrusion block 302 and the inner end face of the swing plate 301, so that the elastic element a306 pushes the extrusion block 302 to the end of the swing plate 301 away from the mounting plate 3 in its natural state; finally, one end of the adjustment plate 303 is rotatably connected to the side of the extrusion block 302 away from the elastic element a306 through a pin, and at the same time, the adjustment plate 303 is aligned with the sliding groove 304 on the surface of the mounting plate 3, and the connecting pin 305 is inserted through the two sliding grooves 304 to complete the assembly of the adjustment structure and the fixing ring 2; The fixed ring 2, with its assembled adjustment structure, is fixed to the inner wall of the outer shell 1 (the axis of the fixed ring 2 coincides with the axis of the outer shell 1). Multiple connecting blocks c5 (evenly distributed along the circumference of the fixed ring 2) are welded to the end faces of both ends of the fixed ring 2. Each connecting block c5 has a pre-drilled pin hole. The pin at one end of the connecting rod 501 is inserted into the pin hole of the connecting block c5, and an elastic element b503 is fitted onto the outside of the pin (the elastic element b503 initially keeps the connecting rod 501 horizontal). Then, several permanent magnet bodies 101 are placed one-to-one into the connecting rod 5. 01. Limiting groove 502 on the surface (limiting groove 502 is an arc-shaped groove, the curvature of which is adapted to the outer arc surface of permanent magnet body 101 to ensure that permanent magnet body 101 can slide along the arc surface of limiting groove 502 without detaching); put rotor 102 into fixing ring 2 from one end of housing 1 (maintain a preset gap between the outer circumference of rotor 102 and the inner circumference of fixing ring 2), insert sealing shell 6 into the openings at both ends of housing 1, so that the two ends of rotor 102 shaft pass through the center holes of two sealing shell 6 respectively, and the shaft and the center hole of sealing shell 6 are rotatably connected by bearings to complete the overall assembly; When multiple permanent magnet bodies 101 at one end (such as the left end) of the fixed ring 2 need to retract and swing, the operator turns the free end of the left end adjustment plate 303 clockwise. The adjustment plate 303 rotates with the connecting pin 305 as the fulcrum, and the end of it close to the pressing block 302 applies a pushing force towards the pressing block 302. This pushing force overcomes the elastic force of the elastic element a306 and pushes the pressing block 302 to slide along the guide groove in the inner cavity of the swing plate 301 towards the mounting plate 3. During the sliding process of the extrusion block 302, it generates a radial thrust on the inner cavity of the swing plate 301 (perpendicular to the direction of the guide groove of the swing plate 301), causing the swing plate 301 to rotate counterclockwise around the pin on the mounting plate 3 (opposite to the direction of the adjustment plate 303). The connecting blocks a4 on both sides of the swing plate 301 rotate synchronously with the swing plate 301, thereby pulling one end of the connecting rod 401 through the pin (the pin connection between the connecting rod 401 and the connecting block a4 ensures that the connecting rod 401 can rotate with the connecting block a4 and will not fall off). The other end of the connecting rod 401 drives the connecting block b402 to move through the pin. The connecting block b402 is welded and fixed to the extrusion ring 403. Therefore, the extrusion ring 403 moves with the connecting block b402 towards the permanent magnet body 101. The compression ring 403 is a hollow frustum structure. Its inner inclined surface is adapted to the outer inclined surface of the permanent magnet body 101. When the compression ring 403 moves, it applies radial compression force through the inclined surface, causing the permanent magnet body 101 to contract along the arc of the limiting groove 502 of the connecting rod 501 towards the axis of the fixed ring 2, while swinging downwards (the side away from the axis of the fixed ring 2 is "up", and the side closer is "down"). When the permanent magnet body 101 swings, it drives the connecting rod 501 to rotate clockwise around the pin of the connecting block c5. As the connecting rod 501 rotates, it twists the elastic element b503 (the elastic element b503 is a torsion spring, one end of which is fixed to the connecting block c5, and the other end of which is fixed to the connecting rod 501), causing the elastic element b503 to undergo elastic deformation and store reset potential energy; at this time, the adjustment structure at the right end of the fixed ring 2 is not under force, and the right end connecting rod 401 pushes the right end compression ring 403 to move away from the permanent magnet body 101 under the linkage of the left end structure, so as to avoid the right end permanent magnet body 101 interfering with the left end action; When the left permanent magnet body 101 swings to its maximum amplitude, the operator reverses the direction of the left adjustment plate 303 in the counterclockwise direction. The pushing force of the adjustment plate 303 on the pressing block 302 disappears, the elastic element a306 releases elastic potential energy, and pushes the pressing block 302 to reset along the guide groove of the swing plate 301. The pressing block 302 then pushes the adjustment plate 303 to rotate in the opposite direction around the connecting pin 305. At the same time, the elastic element b503 releases torsional potential energy, which drives the connecting rod 501 to rotate counterclockwise around the pin of the connecting block c5 to reset. The connecting rod 501 drives the permanent magnet body 101 to swing upward to reset through the limiting groove 502, forming a reciprocating motion of "swinging downward and resetting upward". When the permanent magnet body 101 oscillates back and forth, its surface pushes the air flow in the inner cavity of the outer shell 1. The originally static hot airflow (the heat generated by the operation of the permanent magnet body 101 raises the temperature of the surrounding air) is disturbed by the oscillating permanent magnet body 101, forming a convective airflow along the axial and radial directions of the outer shell 1. This accelerates the heat exchange between the hot airflow and the inner wall of the outer shell 1 (the outer shell 1 is made of metal, which has good thermal conductivity and can transfer heat to the outside). This prevents the permanent magnet body 101 from weakening due to local high temperature. During the reset process of the permanent magnet body 101, the reset force of the elastic element b503 causes the permanent magnet body 101 to vibrate instantaneously (the reset speed is greater than the swing speed, forming an impact vibration). This vibration can remove the dust adhering to the surface of the permanent magnet body 101 (dust that enters from the gap of the outer shell 1 during operation) from the surface, thus avoiding dust accumulation from affecting the magnetic permeability and heat dissipation efficiency of the permanent magnet body 101. When it is necessary to increase the swing amplitude of the permanent magnet body 101, the operator loosens the knob 7 by using the anti-slip texture 701 on the surface of the knob 7 (the knob 7 is threadedly connected to the connecting pin 305; in the initial state, the knob 7 is pressed tightly against the surface of the adjusting plate 303, restricting the sliding of the connecting pin 305); after the knob 7 is loosened, the connecting pin 305 can slide along the inner cavity of the sliding groove 304 of the mounting plate 3 and the adjusting plate 303 (the sliding groove 304 is long and the length direction is consistent with the length direction of the adjusting plate 303). Sliding the connecting pin 305 away from the mounting plate 3 can increase the lever arm of the adjusting plate 303 (the distance from the free end of the adjusting plate 303 to the connecting pin 305 increases); after the adjustment is completed, tighten the knob 7 so that the knob 7 presses the adjusting plate 303 again and fixes the position of the connecting pin 305. After the lever arm of the adjusting plate 303 is increased, when the operator applies the same force, the thrust torque of the adjusting plate 303 on the pressing block 302 increases, the sliding distance of the pressing block 302 increases, and thus the rotation angle of the swing plate 301 increases. The increased rotation angle of the swing plate 301 causes the connecting rod 401 to move a greater distance, and the pressing force stroke of the pressing ring 403 on the permanent magnet body 101 increases, ultimately increasing the swing amplitude of the permanent magnet body 101 (conversely, the connecting pin 305 slides closer to the mounting plate 3, and the swing amplitude decreases). The clearance groove 702 on the surface of the outer shell 1 provides space for the large-angle rotation of the adjusting plate 303, avoiding interference between the adjusting plate 303 and the inner wall of the outer shell 1. The surface of the permanent magnet body 101 is coated with an anti-oxidation coating, which is a ceramic coating or a metal alloy coating, and can effectively prevent the permanent magnet body 101 from oxidizing.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, in the accompanying drawings of this invention, the fill patterns are merely for distinguishing layers and do not constitute any other limitation.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An antioxidant neodymium iron boron permanent magnet assembly, comprising: The outer shell (1), several permanent magnet bodies (101) and rotor (102); The feature is that: the inner cavity of the outer shell (1) is provided with a connection structure for connecting the permanent magnet body (101), the connection structure including a fixing ring (2) fixedly connected to the outer shell (1); The surface of the fixed ring (2) is provided with an adjustment structure for driving the permanent magnet body (101) to contract and swing to disturb the airflow for heat dissipation; The adjustment structure includes two mounting plates (3) symmetrically fixed to the surface of the fixed ring (2). Each mounting plate (3) has a swing plate (301) rotatably connected to its surface via a pin. The inner cavity of the swing plate (301) is slidably connected to a pressing block (302). The surface of the pressing block (302) is rotatably connected to an adjustment plate (303) via a pin. A sliding groove (304) is provided through the surface of each mounting plate (3) and the surface of the adjustment plate (303). A connecting pin (305) is slidably connected to the inner cavity of the sliding groove (304). An elastic element a (306) is provided between the pressing block (302) and the inner wall of the swing plate (301).

2. The antioxidant NdFeB permanent magnet assembly according to claim 1, characterized in that: The adjustment structure also includes two connecting blocks a (4) symmetrically fixedly connected to both sides of each swing plate (301). The inner cavity of each connecting block a (4) is rotatably connected to a connecting rod (401) via a pin. The end of each connecting rod (401) away from the connecting block a (4) is rotatably connected to a connecting block b (402) via a pin. The surface of the connecting block b (402) is fixedly connected to a compression ring (403) for driving the permanent magnet body (101) to contract and swing.

3. The antioxidant NdFeB permanent magnet assembly according to claim 1, characterized in that: The connection structure also includes multiple connecting blocks c (5) fixedly connected to both ends of the fixed ring (2). The inner cavity of each connecting block c (5) is rotatably connected to a connecting rod (501) via a pin. Each connecting rod (501) has a symmetrically provided limiting groove (502) for installing a permanent magnet body (101) on its surface. Each permanent magnet body (101) is slidably connected to the surface of the corresponding limiting groove (502). The pin surface of the connecting rod (501) is sleeved with an elastic element b (503) for providing a reset elastic force.

4. The antioxidant NdFeB permanent magnet assembly according to claim 1, characterized in that: The surface of the outer shell (1) is fitted with two sealing shells (6) for sealing and protection. The rotor (102) is located inside the fixed ring (2), and the shaft of the rotor (102) is rotatably connected to the inner cavity of the sealing shell (6).

5. The antioxidant NdFeB permanent magnet assembly according to claim 1, characterized in that: The connecting pin (305) has a threaded connection to a knob (7) for locking and fixing. The surface of the knob (7) has anti-slip texture (701). The surface of the outer shell (1) has a relief groove (702). The position of the relief groove (702) is adapted to the position of the adjusting plate (303).

6. The antioxidant NdFeB permanent magnet assembly according to claim 1, characterized in that: The number of the extrusion rings (403) is two and they are symmetrically distributed. The extrusion rings (403) are hollow frustum structures. The permanent magnet body (101) is adapted to be installed on the inner side of the extrusion rings (403).

7. The antioxidant NdFeB permanent magnet assembly according to claim 1, characterized in that: The elastic element a (306) is a compression spring, and the two ends of the elastic element a (306) are fixedly connected to the inner wall of the swing plate (301) and the surface of the extrusion block (302) respectively. The elastic element b (503) is a torsion spring.

8. The method for preparing an antioxidant NdFeB permanent magnet assembly according to claim 1, characterized in that, An antioxidant neodymium iron boron permanent magnet assembly according to any one of claims 1-7, the specific method includes the following steps; S1. Assemble the adjustment structure and fixing ring (2): Assemble the mounting plate (3), swing plate (301), pressing block (302), elastic element a (306), adjustment plate (303) and connecting pin (305) in sequence to form the adjustment structure, and then fix the adjustment structure to the surface of the fixing ring (2). S2. Fixing the fixing ring (2) and the outer shell (1): Fix the fixing ring (2) with the assembled adjustment structure to the inner wall of the outer shell (1) to ensure that the axes of the two coincide; S3. Install the connecting parts of the permanent magnet body (101): Fix the connecting blocks c (5) at both ends of the fixing ring (2), assemble the connecting rod (501) and the elastic element b (503), and then install the permanent magnet body (101) in the limiting groove (502) of the connecting rod (501); S4. Assemble the rotor (102) and the sealing shell (6): Place the rotor (102) into the fixing ring (2), and embed the sealing shell (6) at both ends of the outer shell (1) so that the rotor (102) shaft is rotatably connected to the sealing shell (6) to complete the component preparation.

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