A rotor magnet fixing structure and motor

Abstract

This invention relates to a rotor magnet fixing structure, including a flywheel. The flywheel includes a connected annular side plate and a base plate. The base plate has an air inlet. A plurality of magnets are evenly distributed circumferentially on the inner annular surface of the annular side plate. A first magnet retaining ring is closely attached to the end face of each magnet away from the base plate. Circumferentially distributed fan blades are provided on the side of the first magnet retaining ring away from the magnet. Compared with the prior art, this invention, by setting fan blades on the magnet retaining ring to act as a centrifugal fan, can effectively dissipate the heat generated by the motor, greatly reducing motor temperature rise, thereby reducing motor copper loss, improving motor efficiency and service life. At the same time, the motor line load can be appropriately increased during design, thereby reducing motor cost and size. The motor has the aforementioned rotor magnet fixing structure and has the same technical effects.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to a rotor magnet fixing structure and a motor. Background Technology

[0002] The motor rotor has a ring of ferrite magnets surrounding its iron core. These magnets generate an alternating magnetic field with the energized stator coils, driving the rotor to rotate. In practical applications, a flywheel is typically used to secure the magnets, with the magnets adhered to its inner ring surface. Protective rings are also placed at both ends of the entire ring of magnets for further fixation. This structure suffers from poor heat dissipation. In existing technologies, the motor generates significant heat during prolonged use, leading to increased copper losses and a decrease in both efficiency and lifespan. Summary of the Invention

[0003] The first objective of this invention is to provide a rotor magnet fixing structure that addresses the problem of poor heat dissipation in existing rotor magnet fixing structures, which leads to severe overheating of the motor during prolonged use and consequently reduces its efficiency and lifespan. The second objective of this invention is to provide a motor.

[0004] To achieve the aforementioned first objective, the technical solution adopted by the present invention is as follows:

[0005] A rotor magnet fixing structure includes a flywheel, the flywheel including a connected annular side plate and a base plate, the base plate having an air inlet hole, a plurality of magnets evenly distributed on the inner annular surface of the annular side plate, a first magnet guard ring being tightly attached to the end face of the magnet away from the base plate, and fan blades evenly distributed on the side face of the first magnet guard ring away from the magnet.

[0006] The present invention, employing the aforementioned technical solution, utilizes circumferentially distributed fan blades on the first magnet retaining ring. When the motor rotor rotates, the fan blades function as a centrifugal fan, driving the outer ring air to flow at high speed with relatively low pressure. Due to the pressure difference between the inside and outside, the internal air is radially discharged from the flywheel. After the internal air is discharged, external air enters the interior through openings in the flywheel base plate, continuously carrying away internal heat and achieving a heat dissipation effect. Compared to the poor heat dissipation of the rotor magnet fixed structure in the prior art, which leads to severe overheating during prolonged motor use and reduced efficiency and lifespan, the present invention effectively dissipates the heat generated by the motor, significantly reducing motor temperature rise, thereby reducing motor copper losses, improving motor efficiency and lifespan. Simultaneously, the motor line load can be appropriately increased during design, thus reducing motor cost and size.

[0007] Furthermore, the fan blades are plate-shaped structures, and the normal direction of any fan blade plate surface is parallel to the tangential direction of the first magnetic steel retaining ring at its location. This arrangement allows the fan blades to have a larger contact area with the air in the tangential direction when the motor rotor rotates and drives the first magnetic steel retaining ring to rotate, thereby driving more airflow and achieving a better centrifugal exhaust effect.

[0008] Furthermore, a second magnet guard ring is tightly abutted on the end face of the magnet near the base plate; a first partition plate is evenly distributed circumferentially on the side of the first magnet guard ring tightly abutted against the magnet, and the end of the magnet away from the base plate is engaged in the gap between the first partition plates; a second partition plate is evenly distributed circumferentially on the side of the second magnet guard ring tightly abutted against the magnet, and the end of the magnet near the base plate is engaged in the gap between the second partition plates. The first partition plate and the second partition plate are used to separate and limit the magnet in the circumferential direction, ensuring that the magnet is evenly distributed in the circumferential direction.

[0009] Furthermore, the number of fan blades is the same as that of the first partition plate, and they are arranged one-to-one on both sides of the first magnetic steel guard ring. Each fan blade and its corresponding first partition plate are connected to form a plate-like structure, making the production and manufacturing process easier.

[0010] Furthermore, the first magnet retaining ring is provided with a support portion that abuts against both sides of any of the fan blades, and the support portion is provided to prevent deformation at the root of the connection between the fan blade and the first magnet retaining ring.

[0011] Furthermore, the support portion is a concave arc shape that smoothly transitions between the first magnet guard ring and the side of the fan blade. By setting the support portion to a concave shape, the radial exhaust area is increased, allowing more hot air to be discharged and resulting in better heat dissipation.

[0012] Furthermore, both the fan blade and the first partition are rectangular plate structures. The radial width of the fan blade is greater than the radial width of the first partition. Setting the fan blade and the first partition as rectangular facilitates manufacturing. The larger radial width of the fan blade increases its contact area with the air, thereby driving more airflow and achieving a better centrifugal exhaust effect.

[0013] Furthermore, the second magnet retaining ring has circumferentially distributed pads on the side away from the magnet. The pads abut against the base plate. The design of the pads reduces the contact area between the second magnet retaining ring and the base plate, reducing the heat conducted from the flywheel to the second magnet retaining ring, thereby reducing the heat transferred to the magnet and reducing the possibility of the magnet adhesive melting due to heat.

[0014] Furthermore, both the first and second magnetic retaining rings are made of nylon, a material with excellent comprehensive properties, including mechanical properties, heat resistance, wear resistance, chemical resistance, and self-lubrication, and is easy to process.

[0015] To achieve the second objective, the present invention adopts the following technical solution:

[0016] An electric motor includes the aforementioned rotor magnet fixing structure.

[0017] The beneficial effects of this invention are: it can effectively dissipate the heat generated by the motor during operation, greatly reduce the motor temperature rise, thereby reducing the motor copper loss, improving the motor efficiency and service life. At the same time, the motor line load can be appropriately increased during design, thereby reducing the motor cost and size; the motor has the same technical effects as the aforementioned rotor magnet fixing structure. Attached image description:

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is an exploded view of the present invention;

[0020] Figure 3 for Figure 2 A magnified view of A in the middle.

[0021] The markings in the diagram are: 1-first magnet guard ring, 2-magnet, 3-second magnet guard ring, 4-flywheel, 5-fan blade, 6-first partition, 7-support part, 8-second partition, 9-annular side plate, 10-bottom plate, 11-pad block. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings.

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0024] Example 1: This example provides a rotor magnet fixing structure, such as... Figure 1-3 As shown, it includes a flywheel 4, which includes a connected annular side plate 9 and a base plate 10. The base plate 10 has an air inlet. A plurality of magnets 2 are evenly distributed around the inner annular surface of the annular side plate 9. A first magnet guard ring 1 is attached to the end face of the magnet 2 away from the base plate 10. The side face of the first magnet guard ring 1 away from the magnet 2 has evenly distributed fan blades 5.

[0025] The fan blade 5 has a plate-like structure, and the normal direction of any fan blade 5 plate surface is parallel to the tangent direction of the first magnetic steel guard ring 1 at its location.

[0026] A second magnet guard ring 3 is attached to the end face of the magnet 2 close to the base plate 10; a first partition plate 6 is evenly distributed around the circumference on the side of the first magnet guard ring 1 that is attached to the magnet 2, and the end of the magnet 2 away from the base plate 10 is engaged in the gap between the first partition plates 6; a second partition plate 8 is evenly distributed around the circumference on the side of the second magnet guard ring 3 that is attached to the magnet 2, and the end of the magnet 2 close to the base plate 10 is engaged in the gap between the second partition plates 8.

[0027] The number of fan blades 5 and the number of first partition plates 6 are the same, and they are arranged one-to-one on both sides of the first magnetic steel guard ring 1. Any fan blade 5 and its corresponding first partition plate 6 are connected to form a plate-like structure.

[0028] Both the fan blade 5 and the first partition 6 are rectangular plate structures, and the radial width of the fan blade 5 is greater than the radial width of the first partition 6.

[0029] The first magnetic steel guard ring 1 is provided with a support part 7 that abuts against both sides of any fan blade 5;

[0030] The support part 7 is a concave arc shape, which smoothly transitions between the side of the first magnet guard ring 1 and the fan blade 5.

[0031] The second magnet guard ring 3 has circumferentially distributed pads 11 on the side away from the magnet 2, and the pads 11 abut against the bottom plate 10.

[0032] Both the first magnetic retaining ring 1 and the second magnetic retaining ring 3 are made of nylon.

[0033] The present invention, employing the aforementioned technical solution, utilizes circumferentially distributed fan blades on the first magnet retaining ring. When the motor rotor rotates, the fan blades function as a centrifugal fan, driving the outer ring air to flow at high speed with relatively low pressure. Due to the pressure difference between the inside and outside, the internal air is radially discharged from the flywheel. After the internal air is discharged, external air enters the interior through openings in the flywheel base plate, continuously carrying away internal heat and achieving a heat dissipation effect. Compared to the poor heat dissipation of the rotor magnet fixed structure in the prior art, which leads to severe overheating during prolonged motor use and reduced efficiency and lifespan, the present invention effectively dissipates the heat generated by the motor, significantly reducing motor temperature rise, thereby reducing motor copper losses, improving motor efficiency and lifespan. Simultaneously, the motor line load can be appropriately increased during design, thus reducing motor cost and size.

[0034] Example 2: An electric motor, which includes the above-described rotor magnet fixing structure.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rotor magnet fixing structure characterized by: The flywheel (4) includes a connected annular side plate (9) and a base plate (10). The base plate (10) has an air inlet. A number of magnets (2) are evenly distributed on the inner ring surface of the annular side plate (9). A first magnet guard ring (1) is attached to the end face of the magnet (2) away from the base plate (10). The side face of the first magnet guard ring (1) away from the magnet (2) has evenly distributed fan blades (5). A second magnet guard ring (3) is attached to the end face of the magnet (2) close to the base plate (10); a first partition plate (6) is provided on the side of the first magnet guard ring (1) close to the magnet (2) and is evenly distributed around the circumference, and the end of the magnet (2) away from the base plate (10) is engaged in the gap between the first partition plates (6); a second partition plate (8) is provided on the side of the second magnet guard ring (3) close to the magnet (2) and is evenly distributed around the circumference, and the end of the magnet (2) close to the base plate (10) is engaged in the gap between the second partition plates (8); The number of fan blades (5) is the same as that of the first partition (6), and they are arranged on both sides of the first magnetic steel guard ring (1) in a one-to-one correspondence. Any fan blade (5) and its corresponding first partition (6) are connected to form a plate-like structure. The second magnet guard ring (3) has circumferentially distributed pads (11) on the side away from the magnet (2), and the pads (11) abut against the base plate (10).

2. The rotor magnet fixing structure according to claim 1, characterized in that: The fan blade (5) has a plate-like structure, and the normal direction of the plate surface of any fan blade (5) is parallel to the tangent direction of the first magnetic steel guard ring (1) at its location.

3. The rotor magnet fixing structure according to claim 1, characterized in that: The first magnetic steel guard ring (1) is provided with a support part (7) that abuts against the two sides of any of the fan blades (5).

4. The rotor magnet fixing structure according to claim 3, characterized in that: The support part (7) is a concave arc shape, which smoothly transitions between the first magnet guard ring (1) and the side of the fan blade (5).

5. The rotor magnet fixing structure according to claim 1, characterized in that: Both the fan blade (5) and the first partition (6) are rectangular plate structures, and the radial width of the fan blade (5) is greater than the radial width of the first partition (6).

6. The rotor magnet fixing structure according to claim 1, characterized in that: Both the first magnetic retaining ring (1) and the second magnetic retaining ring (3) are made of nylon.

7. An electric motor, characterized in that: The rotor magnet fixing structure includes any one of claims 1-6.

Images