Permanent magnet structure for a rotor of an electric machine

Abstract

The utility model provides a permanent magnet structure for motor rotor belongs to permanent magnet structure technical field, including motor rotor core and multiple permanent magnet body, is equipped with multiple installation groove for installing permanent magnet body on motor rotor core, multiple permanent magnet body is located in the installation groove respectively, both ends of motor rotor core are equipped with the fixed ring, one of fixed ring is provided with the insulating ring and multiple first buffer pad, is equipped with multiple heat dissipation cavities on motor rotor core, is equipped with multiple arc grooves on motor rotor core, both sides of multiple permanent magnet body are equipped with second buffer pad, both ends of multiple fixed ring are provided with the connecting ring. The device is equipped with the heat dissipation hole on the installation groove, and makes its opening direction from outside to inside through the heat dissipation cavity and is arranged on the inner wall of motor rotor core, so that the user can quickly transfer the heat near the permanent magnet body to the heat dissipation cavity, improves the heat dissipation efficiency of the device.

Description

Technical Field

[0001] This utility model belongs to the field of permanent magnet structure technology, and more specifically, it relates to a permanent magnet structure for motor rotors. Background Technology

[0002] In the field of motor manufacturing, permanent magnet structures are often used to provide a stable magnetic field for the motor rotor to ensure energy conversion.

[0003] During continuous operation of the motor, to prevent the permanent magnet from losing its magnetic properties due to excessive temperature rise, the permanent magnet mounting structure often needs to have good heat dissipation capabilities. However, traditional devices lack heat dissipation functions and rely solely on the rotor's own natural heat dissipation. As a result, during high-load operation, the heat generated by the permanent magnet cannot be quickly dissipated, and the heat continuously accumulates in the gap between the permanent magnet and the iron core. Since the magnetic properties of permanent magnets are sensitive to temperature, prolonged exposure to high temperatures can easily lead to a decrease in magnetic flux and coercivity, which can easily cause local demagnetization or even complete failure of the permanent magnet.

[0004] Not only will it affect the motor's output torque and operating accuracy, causing a significant drop in motor efficiency, but it will also cause a chain of faults such as loosening of the connection between the permanent magnet and the iron core due to overheating, increasing the frequency of motor maintenance and maintenance costs, and thus severely shortening the actual service life of the motor. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a permanent magnet structure for motor rotors, thereby solving the technical problem that traditional devices in the prior art lack heat dissipation functionality.

[0006] The purpose and effect of the permanent magnet structure for motor rotor of this utility model are achieved by the following specific technical means:

[0007] The permanent magnet structure for a motor rotor includes a motor rotor core and multiple sets of permanent magnet bodies. The motor rotor core has multiple mounting slots for installing the permanent magnet bodies, and each set of permanent magnet bodies is located within one of these mounting slots. Each end of the motor rotor core has a fixing ring, one set of which has an insulating ring and multiple sets of first buffer pads. The motor rotor core has multiple heat dissipation cavities. The motor rotor core also has multiple arc-shaped grooves. Second buffer pads are provided on both sides of each set of permanent magnet bodies, and connecting rings are provided at both ends of each set of fixing rings.

[0008] According to a preferred embodiment, multiple sets of mounting slots and multiple sets of arc-shaped slots are equidistantly distributed along the outer circular surface of the motor rotor core, the height of each set of arc-shaped slots is less than the height of the mounting slots, and each set of arc-shaped slots is provided with a protective pad.

[0009] According to a preferred embodiment, multiple sets of heat dissipation cavities are equidistantly distributed along the circular surface of the motor rotor core, and multiple sets of heat dissipation holes are opened on each of the multiple sets of mounting slots. The opening direction of the multiple sets of heat dissipation holes is from the outside to the inside, passing through the heat dissipation cavity and penetrating the inner wall of the motor rotor core.

[0010] According to a preferred embodiment, each of the multiple sets of heat dissipation cavities is provided with multiple sets of heat dissipation fins, and the multiple sets of heat dissipation cavities are T-shaped. One set of heat dissipation fins is attached to the direction of the mounting groove, and the other set of heat dissipation fins is attached to the direction of the inner wall of the motor rotor core.

[0011] According to a preferred embodiment, multiple sets of fixed rings are connected to the motor rotor core by fixed bolts, multiple sets of connecting rings are snapped onto the fixed rings, multiple sets of connecting rings are provided with multiple sets of fixed posts, and multiple sets of fixed posts pass through multiple sets of second buffer pads and are inserted into the permanent magnet body.

[0012] According to a preferred embodiment, multiple sets of the first buffer pads and both ends of the motor rotor core are provided with slots, and sealing rings are fitted in the slots.

[0013] According to a preferred embodiment, the insulating ring is made of epoxy glass cloth, and the plurality of first buffer pads and the plurality of second buffer pads are both made of silicone rubber.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. This device features heat dissipation holes in the mounting slot, with the holes extending from the outside in and passing through the heat dissipation cavity onto the inner wall of the motor rotor core. This allows users to quickly transfer heat from the vicinity of the permanent magnet to the heat dissipation cavity, improving the device's heat dissipation efficiency. After prolonged motor operation and temperature increases, the combined effect of the heat dissipation holes and the heat dissipation fins within the heat dissipation cavity accelerates heat dissipation, eliminating concerns about heat buildup leading to motor performance degradation and enhancing the device's heat dissipation reliability during continuous operation.

[0016] 2. When using this device, users can utilize the equidistant distribution of the mounting slots and arc-shaped grooves along the outer circular surface of the motor rotor core to rationally arrange the permanent magnet body and protective pads. This allows users to optimize the magnetic field distribution of the motor and improve the electromagnetic performance of the device. Furthermore, by installing heat dissipation fins within the heat dissipation cavity, with the fins aligned with both the mounting slot direction and the inner wall of the motor rotor core, the device can dissipate the heat generated by the motor operation, reducing the motor temperature, extending the motor's lifespan, and improving the device's heat dissipation capacity. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the assembled structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the disassembled structure of this utility model;

[0019] Figure 3 This is a top view of the present invention;

[0020] Figure 4 This is an isometric view of the present invention.

[0021] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0022] 11. Motor rotor core; 12. Permanent magnet body; 13. Mounting slot; 14. Fixing ring; 15. Insulating ring; 16. First buffer pad; 24. Protective pad; 17. Heat dissipation cavity; 18. Second buffer pad; 19. Connecting ring; 21. Heat dissipation fins; 22. Fixing post; 23. Sealing ring. Detailed Implementation

[0023] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the technical solution of this utility model, but should not be used to limit the scope of protection of this utility model.

[0024] Example:

[0025] like Figures 1 to 2 As shown, this utility model provides a permanent magnet structure for a motor rotor, including a motor rotor core 11 and multiple sets of permanent magnet bodies 12. The motor rotor core 11 has multiple sets of mounting slots 13 for mounting the permanent magnet bodies 12. The multiple sets of permanent magnet bodies 12 are respectively located in the mounting slots 13. Both ends of the motor rotor core 11 are provided with fixing rings 14. One set of fixing rings 14 is provided with an insulating ring 15 and multiple sets of first buffer pads 16. The motor rotor core 11 has multiple sets of heat dissipation cavities 17 and multiple sets of arc-shaped grooves. Both sides of the multiple sets of permanent magnet bodies 12 are provided with second buffer pads 18. Both ends of the multiple sets of fixing rings 14 are provided with connecting rings 19.

[0026] Specifically, the motor rotor core 11 serves as the core carrier, and the mounting slot 13 provides installation space for the permanent magnet body 12, ensuring stable embedding of the permanent magnet; the fixing ring 14 limits the two ends of the motor rotor core 11, enhancing the overall structural stability; the insulating ring 15 blocks current conduction, avoiding the risk of leakage between the permanent magnet and the core; the first buffer pad 16 and the second buffer pad 18 respectively fill the gaps between the two ends of the core and the two sides of the permanent magnet, reducing rigid contact wear between components; the heat dissipation cavity 17 cooperates with the arc-shaped groove to provide a channel for heat dissipation, and the arc-shaped groove can also reduce the weight of the core; the connecting ring 19 assists the fixing ring 14 in connecting with the external structure, improving assembly stability.

[0027] Multiple sets of mounting slots 13 and multiple sets of arc-shaped slots are equidistantly distributed along the outer circular surface of the motor rotor core 11. The height of each set of arc-shaped slots is less than the height of the mounting slots 13, and each set of arc-shaped slots is provided with a protective pad 24.

[0028] Specifically, the mounting slot 13 and the arc-shaped slot are equidistantly distributed, so that the permanent magnet is subjected to uniform force and the weight distribution of the iron core is balanced; the height of the arc-shaped slot is less than the height of the mounting slot 13, so as to avoid affecting the installation stability of the permanent magnet; the protective pad 24 covers the surface of the arc-shaped slot, reducing friction damage to other components when the iron core rotates, and extending the service life.

[0029] Multiple heat dissipation cavities 17 are equidistantly distributed along the circular surface of the motor rotor core 11. Multiple heat dissipation holes are opened on multiple mounting slots 13. The opening direction of the multiple heat dissipation holes is from the outside to the inside, passing through the heat dissipation cavity 17 and onto the inner wall of the motor rotor core 11.

[0030] Specifically, the equidistantly distributed heat dissipation cavities 17 expand the heat dissipation area, and the heat dissipation holes penetrate the mounting groove 13 and the heat dissipation cavity 17 and connect to the inner wall of the iron core to form a heat conduction channel, which quickly conducts the heat generated by the permanent magnet to the outside of the iron core, avoiding the impact of high temperature on the magnetic performance of the permanent magnet.

[0031] like Figures 2 to 4 As shown: Multiple sets of heat dissipation fins 21 are provided in multiple heat dissipation cavities 17. The multiple sets of heat dissipation cavities 17 are T-shaped. One set of heat dissipation fins 21 is attached to the direction of the mounting groove 13, and the other set of heat dissipation fins 21 is attached to the direction of the inner wall of the motor rotor core 11.

[0032] Specifically, the T-shaped heat dissipation cavity 17 increases the contact area with air, and the heat dissipation fins 21 are respectively attached to the mounting groove 13 and the inner wall of the iron core, which enhances the heat conduction efficiency from the permanent magnet to the heat dissipation cavity 17 and then to the outside of the iron core, improves the overall heat dissipation effect, and ensures that the permanent magnet works at a suitable temperature.

[0033] Multiple sets of fixing rings 14 are connected to the motor rotor core 11 by fixing bolts. Multiple sets of connecting rings 19 are clamped on the fixing rings 14. Multiple sets of fixing posts 22 are provided on the multiple sets of connecting rings 19. Multiple sets of fixing posts 22 pass through multiple sets of second buffer pads 18 and are installed on the permanent magnet body 12.

[0034] Specifically, the fixing bolts securely connect the fixing ring 14 to the iron core, ensuring reliable positioning at both ends; the connecting ring 19 passes through the fixing post 22, through which the second buffer pad 18 is inserted and connected to the permanent magnet, thus both axially fixing the permanent magnet body 12 to prevent it from sliding along the mounting groove 13, and preventing rigid collision between the fixing post 22 and the permanent magnet through the second buffer pad 18. Multiple sets of first buffer pads 16 and both ends of the motor rotor iron core 11 are provided with slots, and sealing rings 23 are fitted into the slots.

[0035] Specifically, the slot provides an installation position for the sealing ring 23. The sealing ring 23 can prevent external dust and moisture from entering the iron core, protecting the permanent magnet and heat dissipation structure from contamination, while enhancing the sealing performance at both ends of the iron core and improving structural reliability. The insulating ring 15 is made of epoxy glass cloth, and the multiple sets of first buffer pads 16 and multiple sets of second buffer pads 18 are all made of silicone rubber.

[0036] Specifically, the epoxy glass cloth board has excellent insulation properties and high temperature resistance, ensuring the long-term stable operation of the insulating ring 15; the silicone rubber buffer pads (first buffer pad 16 and second buffer pad 18) have good elasticity and aging resistance, can fill gaps, reduce loosening and wear after component assembly, and adapt to temperature changes during motor operation.

[0037] The specific usage and function of this embodiment are as follows:

[0038] When in use, the first step is to assemble and fix the structure: place the motor rotor core 11 horizontally, and fasten the two sets of fixing rings 14 to both ends of the core with fixing bolts. The connecting ring 19 is then attached to the fixing ring 14, so that the fixing ring 14, the connecting ring 19 and the core form a stable whole, providing a rigid support foundation for the installation of the permanent magnet.

[0039] When placing the permanent magnet body 12, multiple sets of permanent magnet bodies 12 are embedded into the mounting groove 13 of the iron core, ensuring that the second buffer pads 18 on both sides of the permanent magnet fit against the inner wall of the mounting groove 13 and fill the gap between the permanent magnet and the groove; rotate the connecting ring 19 so that the fixing post 22 passes through multiple sets of second buffer pads 18 and abuts against the permanent magnet body 12, thereby achieving axial positioning of the permanent magnet and preventing loosening after assembly.

[0040] When assembling auxiliary components, an insulating ring 15 and multiple sets of first buffer pads 16 are sequentially installed on one set of fixing rings 14. The first buffer pads 16 fill the gap between the fixing rings 14 and the ends of the iron core. The sealing rings 23 are inserted into the grooves on the first buffer pads 16 through the grooves at both ends of the iron core to block external dust and moisture from entering the internal channels of the iron core.

[0041] After the motor is started, the permanent magnet rotates at high speed with the rotor core 11: the mounting slot 13 and the arc slot are equidistantly distributed to balance the rotor's center of gravity and reduce shaking during rotation; the heat generated by the permanent magnet is conducted to the T-shaped heat dissipation cavity 17 through the heat dissipation holes on the mounting slot 13, and the heat dissipation fins 21 are respectively attached to the mounting slot 13 and the inner wall of the core to accelerate the dissipation of heat to the outside and avoid high temperature affecting the magnetism of the permanent magnet.

[0042] During operation, the first buffer pad 16 and the second buffer pad 18 reduce the rigid contact wear between the iron core, the fixed ring 14 and the permanent magnet through the elastic properties of silicone rubber; the insulating ring 15 blocks the current conduction and prevents the risk of leakage; the protective pad 24 on the arc groove reduces the friction between the iron core and other components. The overall structure ensures the stable operation of the permanent magnet and improves the motor's operating efficiency and durability.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments.

Claims

1. A permanent magnet structure for an electric motor rotor, comprising an electric motor rotor core (11) and multiple sets of permanent magnet bodies (12), characterized in that: The motor rotor core (11) has multiple sets of mounting slots (13) for mounting the permanent magnet bodies (12). The multiple sets of permanent magnet bodies (12) are located in the mounting slots (13). The motor rotor core (11) has fixing rings (14) at both ends. One set of fixing rings (14) is provided with an insulating ring (15) and multiple sets of first buffer pads (16). The motor rotor core (11) has multiple sets of heat dissipation cavities (17). The motor rotor core (11) has multiple sets of arc-shaped slots. The multiple sets of permanent magnet bodies (12) are provided with second buffer pads (18) on both sides. The multiple sets of fixing rings (14) are provided with connecting rings (19) at both ends.

2. The permanent magnet structure for an electric motor rotor according to claim 1, characterized in that: Multiple sets of mounting slots (13) and multiple sets of arc-shaped slots are equidistantly distributed along the outer circular surface of the motor rotor core (11). The height of each set of arc-shaped slots is less than the height of the mounting slots (13). Each set of arc-shaped slots is provided with a protective pad (24).

3. The permanent magnet structure for an electric motor rotor according to claim 2, characterized in that: Multiple sets of heat dissipation cavities (17) are equidistantly distributed along the circular surface of the motor rotor core (11). Multiple sets of heat dissipation holes are opened on multiple sets of mounting slots (13). The opening direction of multiple sets of heat dissipation holes is from the outside to the inside, passing through the heat dissipation cavity (17) and onto the inner wall of the motor rotor core (11).

4. The permanent magnet structure for an electric motor rotor according to claim 3, characterized in that: Multiple sets of heat dissipation fins (21) are provided in each of the multiple heat dissipation cavities (17). The multiple sets of heat dissipation cavities (17) are T-shaped. One set of heat dissipation fins (21) is attached to the direction of the mounting groove (13), and the other set of heat dissipation fins (21) is attached to the direction of the inner wall of the motor rotor core (11).

5. The permanent magnet structure for an electric motor rotor according to claim 1, characterized in that: Multiple sets of fixed rings (14) are connected to the motor rotor core (11) by fixed bolts. Multiple sets of connecting rings (19) are clamped on the fixed rings (14). Multiple sets of fixed posts (22) are provided on the multiple sets of connecting rings (19). Multiple sets of fixed posts (22) pass through multiple sets of second buffer pads (18) and are installed on the permanent magnet body (12).

6. The permanent magnet structure for an electric motor rotor according to claim 5, characterized in that: Multiple sets of the first buffer pads (16) and the motor rotor core (11) are provided with slots at both ends, and sealing rings (23) are provided in the slots.

7. The permanent magnet structure for an electric motor rotor according to claim 1, characterized in that: The insulating ring (15) is made of epoxy glass cloth, and the multiple sets of the first buffer pads (16) and the multiple sets of the second buffer pads (18) are made of silicone rubber.

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