Electric motor rotor and permanent magnet synchronous motor

Abstract

The utility model provides a motor rotor and permanent magnet synchronous motor belong to synchronous motor technical field, including main shaft, is equipped with rotor iron core on the main shaft, is equipped with a plurality of permanent magnet slot on rotor iron core, is equipped with permanent magnet in permanent magnet slot, is equipped with the diaphragm ring between rotor iron core and main shaft, is equipped with through -hole on the diaphragm ring, is equipped with the flow guide plate in through -hole, both sides of rotor iron core are equipped with rotor pressing plate, and are equipped with the isolating cover between two rotor pressing plates, open a plurality of flow guide groove on the isolating cover, are equipped with a plurality of heat pipe in the isolating cover, and heat pipe one end is located in flow guide groove, one end of main shaft is equipped with the radiating vane, this device sets up the setting of diaphragm ring, flow guide plate, heat pipe, flow guide groove etc. Radiating structure in motor rotor, so that the user can enhance the radiating capacity of motor rotor, has promoted the radiating efficiency of this device.

Description

Technical Field

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

[0002] In the field of modern industrial automation, permanent magnet synchronous motors are often used for power transmission and control. For example, in CNC machine tools, in order to achieve high-precision positioning and cutting action of the tool, the motor often starts, stops and changes speed frequently. At this time, permanent magnet synchronous motors are needed to drive various parts of the machine tool, so as to facilitate the processing of high-precision parts.

[0003] However, in actual operation, the overheating of the motor rotor often leads to a decline in motor performance, resulting in a reduction in the motor's output power and efficiency. Traditional motor rotors rely solely on cooling fan blades for heat dissipation, which has limited cooling capacity. As a result, during long-term high-load operation, the temperature of the motor rotor will continue to rise due to heat accumulation. Excessive temperature, under the combined action of electromagnetic force and mechanical stress, can easily lead to the degradation of permanent magnet performance, thereby causing instability in the motor's magnetic field. This not only affects the machining accuracy, causing deviations in the machined parts, but also increases production costs due to frequent motor repairs, thus reducing the company's production efficiency. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a motor rotor and a permanent magnet synchronous motor, thereby resolving the technical issues in the prior art where poor heat dissipation of the motor rotor leads to decreased motor performance, affects equipment operating accuracy, and increases production costs.

[0005] The purpose and effectiveness of the motor rotor and permanent magnet synchronous motor of this utility model are achieved by the following specific technical means:

[0006] The motor rotor includes a main shaft, on which a rotor core is sleeved, and multiple sets of permanent magnet slots are formed on the rotor core, with permanent magnets disposed in the permanent magnet slots;

[0007] A magnetic shielding ring is provided between the rotor core and the main shaft. The magnetic shielding ring has a through hole, and a guide plate is provided inside the through hole.

[0008] The rotor core is provided with rotor pressure plates on both sides, and an isolation cover is provided between the two sets of rotor pressure plates. Multiple sets of flow guide grooves are opened on the isolation cover, and multiple sets of heat pipes are provided inside the isolation cover, with one end of the heat pipe located in the flow guide groove.

[0009] The main shaft is equipped with heat dissipation blades at one end.

[0010] According to a preferred embodiment, the permanent magnet slots penetrate the rotor core and are evenly distributed along the circumferential direction of the main shaft.

[0011] According to a preferred embodiment, the permanent magnet groove has a trapezoidal cross-section, and the inner wall of the permanent magnet groove is provided with two sets of guide grooves symmetrically opened, and the inner wall of the guide groove is provided with a cooling groove.

[0012] The permanent magnet is symmetrically provided with guide blocks, which are engaged in the guide groove.

[0013] According to a preferred embodiment, the rotor pressure plate is provided with multiple sets of heat dissipation holes, and the flow guide groove, the through hole of the magnetic shielding ring, and the cooling groove are all connected to the heat dissipation holes.

[0014] According to a preferred embodiment, the flow guide plate is spirally distributed within the through hole of the magnetic shielding ring, and the magnetic shielding ring is provided with a highly thermally conductive insulating coating.

[0015] According to a preferred embodiment, the isolation cover is made of aluminum alloy, and the guide groove is arc-shaped and evenly distributed on the isolation cover along the circumferential direction of the main axis.

[0016] A permanent magnet synchronous motor includes a motor housing, a motor stator is provided inside the motor housing, and a motor rotor passes through the motor stator, with both ends connected to the motor housing.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This utility model enhances the heat dissipation capacity of the motor rotor and improves the heat dissipation efficiency of the device by incorporating heat dissipation structures such as magnetic shielding rings, guide plates, heat pipes, and guide grooves on the motor rotor. Users can guide airflow through the spirally distributed guide plates on the magnetic shielding ring, which, in conjunction with the heat pipes and guide grooves within the isolation cover, transfer and dissipate heat. This eliminates concerns about performance degradation due to heat accumulation and improves the device's ability to operate under high loads for extended periods. For example, during CNC machine tool operation, these heat dissipation structures can control the motor rotor temperature, ensuring stable power output and efficiency, and preventing performance degradation due to overheating.

[0019] 2. When using this device, the user can install the permanent magnet by cooperating with the guide groove on the inner wall of the permanent magnet slot and the guide block on the permanent magnet. This makes motor assembly more convenient and ensures the installation accuracy of the permanent magnet, improving the assembly convenience and magnetic field stability of the device. Furthermore, the connection between the heat dissipation holes on the rotor pressure plate and the guide groove, magnetic isolation ring through-hole, and cooling groove creates a heat dissipation channel network that quickly dissipates heat, reducing the risk of permanent magnet performance degradation and magnetic field instability caused by high temperatures. This reduces the number of motor repairs for the user, lowers production costs, and improves the reliability and economy of the device. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the assembled motor rotor of this utility model;

[0021] Figure 2 This is a schematic diagram of the disassembled motor rotor of this utility model;

[0022] Figure 3 yes Figure 2 Enlarged view of region a in the middle;

[0023] Figure 4 This is a schematic diagram of the structure of the magnetic shielding ring of this utility model;

[0024] Figure 5 This is a schematic diagram of the permanent magnet synchronous motor of this utility model;

[0025] Figure 6 This is a schematic diagram of the internal structure of the permanent magnet synchronous motor of this utility model.

[0026] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0027] 11. Main shaft; 12. Rotor core; 13. Permanent magnet; 14. Permanent magnet slot; 15. Magnetic shielding ring; 16. Guide plate; 17. Rotor pressure plate; 18. Isolation cover; 19. Guide groove; 21. Heat pipe; 22. Heat dissipation fins; 23. Guide groove; 24. Cooling groove; 25. Guide block; 26. Motor housing; 27. Motor stator. Detailed Implementation

[0028] 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.

[0029] Example:

[0030] like Figures 1 to 6As shown, this utility model provides a motor rotor, including a main shaft 11, a rotor core 12 sleeved on the main shaft 11, and multiple sets of permanent magnet slots 14 opened on the rotor core 12. Permanent magnets 13 are provided in the permanent magnet slots 14; the permanent magnets 13 can be fixed by the permanent magnet slots 14.

[0031] A magnetic shielding ring 15 is provided between the rotor core 12 and the main shaft 11. The magnetic shielding ring 15 has a through hole, and a guide plate 16 is provided inside the through hole. The magnetic shielding ring 15 can reduce magnetic leakage and eddy current loss.

[0032] Rotor core 12 is provided with rotor pressure plates 17 on both sides, and an isolation cover 18 is provided between the two sets of rotor pressure plates 17. Multiple sets of guide grooves 19 are provided on the isolation cover 18, and multiple sets of heat pipes 21 are provided inside the isolation cover 18, with one end of the heat pipe 21 located inside the guide groove 19. Through the setting of the isolation cover 18 and the heat pipes 21, heat can be conducted and dissipated, which can prevent the motor from overheating.

[0033] The main shaft 11 is equipped with heat dissipation blades 22 at one end. By setting the heat dissipation blades 22, airflow can be generated through rotation for forced cooling, which can reduce the rotor temperature and improve the heat dissipation efficiency of the device.

[0034] The permanent magnet slots 14 penetrate the rotor core 12 and are evenly distributed along the circumference of the main shaft 11. This arrangement enables a balanced magnetic field output, reducing vibration and noise and improving the stability of the device.

[0035] The permanent magnet slot 14 has a trapezoidal cross-section. Two sets of guide slots 23 are symmetrically arranged on the inner wall of the permanent magnet slot 14, and cooling slots 24 are provided on the inner wall of the guide slots 23. Guide blocks 25 are symmetrically arranged on the permanent magnet 13, and the guide blocks 25 are engaged within the guide slots 23. The guide slots 23 and guide blocks 25 enable the permanent magnet 13 to be positioned and promote coolant flow, simplifying the assembly process and improving heat dissipation, thereby enhancing the reliability and durability of the device.

[0036] like Figure 2 , 3 As shown in Figure 4, the rotor pressure plate 17 is provided with multiple sets of heat dissipation holes. The through holes of the guide groove 19 and the magnetic shielding ring 15, as well as the cooling groove 24, are all connected to the heat dissipation holes. The arrangement of the heat dissipation holes can form a continuous cooling channel, enabling the device to achieve heat exchange and improving the overall cooling effect of the device.

[0037] The guide plates 16 are spirally distributed within the through holes of the magnetic shielding ring 15, which is coated with a highly thermally conductive insulating coating. The guide plates 16 optimize the airflow path and enhance heat conduction, thereby improving the insulation and heat dissipation performance of the device. This thermally conductive insulating coating can be an alumina ceramic coating.

[0038] The isolation cover 18 is made of aluminum alloy, and the guide grooves 19 are arc-shaped and evenly distributed on the isolation cover 18 along the circumference of the main shaft 11. By using the material of the isolation cover 18, the lightweight and high thermal conductivity of aluminum alloy can be utilized to reduce the weight of the device and accelerate heat dissipation, thereby improving the device's lightweight design and heat dissipation performance.

[0039] like Figure 5 , 6 As shown, the permanent magnet synchronous motor includes a motor housing 26, a motor stator 27 is housed inside the motor housing 26, and a motor rotor passes through the motor stator 27, with both ends connected to the motor housing 26. Through the coordinated arrangement of the motor stator 27 and the rotor, which includes components such as the main shaft 11, rotor core 12, and permanent magnet 13, the interaction between the air gap and the magnetic field can be ensured.

[0040] The specific usage and function of this embodiment are as follows:

[0041] During motor assembly, the permanent magnet 13 is first inserted into the trapezoidal permanent magnet slot 14 by engaging with the guide groove 23 on the inner wall of the permanent magnet slot 14 via the guide block 25. Furthermore, the cooling groove 24 within the permanent magnet slot 14, in conjunction with the guide groove 23, promotes airflow, improves heat dissipation, and enhances the reliability and durability of the device. The permanent magnet slot 14 penetrates the rotor core 12 and is evenly distributed along the circumference of the main shaft 11. This allows the motor to achieve a balanced magnetic field output during operation, reducing vibration and noise and improving operational stability.

[0042] Next, the magnetic shielding ring 15 is fitted between the main shaft 11 and the rotor core 12. The high thermal conductivity insulating coating on the magnetic shielding ring 15 can reduce magnetic leakage and eddy current loss, while the spirally distributed guide plate 16 in its through hole can optimize the airflow path, enhance heat conduction, and improve the insulation and heat dissipation performance of the device.

[0043] Next, rotor pressure plates 17 with heat dissipation holes are installed on both sides of the rotor core 12, and an isolation cover 18 is placed between the two sets of rotor pressure plates 17. The isolation cover 18 is made of aluminum alloy, which, due to its light weight and high thermal conductivity, can reduce the weight of the device and accelerate heat dissipation. The arc-shaped guide grooves 19 evenly distributed along the circumference of the main shaft 11 on the isolation cover 18 are connected to the through holes of the magnetic shielding ring 15, the cooling grooves 24, and the heat dissipation holes of the rotor pressure plates 17, forming a continuous cooling channel. When the motor generates heat during operation, the heat pipes 21 conduct the heat to the isolation cover 18, guide it through the guide grooves 19, and achieve heat exchange through the heat dissipation holes to achieve the purpose of heat dissipation and prevent the motor from overheating. At the same time, the heat dissipation blades 22 at one end of the main shaft 11 rotate to generate airflow when the motor is running, which provides forced cooling, further reducing the rotor temperature and improving heat dissipation efficiency.

[0044] When the permanent magnet synchronous motor is running as a whole, the motor rotor is housed within the motor stator 27 inside the motor housing 26, and both ends are connected to the motor housing 26. The cooperation between the motor stator 27 and the rotor ensures the interaction between the air gap and the magnetic field, realizing the conversion of electrical energy into mechanical energy and providing stable and reliable power output for various equipment.

[0045] 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. An electric motor rotor, including a main shaft (11), characterized in that: The main shaft (11) is fitted with a rotor core (12), and the rotor core (12) has multiple sets of permanent magnet slots (14), and permanent magnets (13) are provided in the permanent magnet slots (14); A magnetic shielding ring (15) is provided between the rotor core (12) and the main shaft (11). The magnetic shielding ring (15) has a through hole, and a guide plate (16) is provided inside the through hole. The rotor core (12) is provided with rotor pressure plates (17) on both sides, and an isolation cover (18) is provided between the two sets of rotor pressure plates (17). Multiple sets of guide grooves (19) are opened on the isolation cover (18), and multiple sets of heat pipes (21) are provided inside the isolation cover (18), with one end of the heat pipe (21) located inside the guide groove (19). The main shaft (11) is provided with heat dissipation blades (22) at one end.

2. The motor rotor according to claim 1, characterized in that: The permanent magnet slot (14) penetrates the rotor core (12) and is evenly distributed along the circumference of the main shaft (11).

3. The motor rotor according to claim 2, characterized in that: The permanent magnet groove (14) has a trapezoidal cross section. The inner wall of the permanent magnet groove (14) is provided with two sets of guide grooves (23) symmetrically opened. The inner wall of the guide groove (23) is provided with a cooling groove (24). The permanent magnet (13) is symmetrically provided with guide blocks (25), and the guide blocks (25) are engaged in the guide groove (23).

4. The motor rotor according to claim 3, characterized in that: The rotor pressure plate (17) is provided with multiple sets of heat dissipation holes. The flow guide groove (19), the through hole of the magnetic shielding ring (15), and the cooling groove (24) are all connected to the heat dissipation holes.

5. The motor rotor according to claim 4, characterized in that: The flow guide plate (16) is spirally distributed in the through hole of the magnetic shielding ring (15), and the magnetic shielding ring (15) is provided with a high thermal conductivity insulating coating.

6. The motor rotor according to claim 1, characterized in that: The isolation cover (18) is made of aluminum alloy, and the guide groove (19) is arc-shaped and evenly distributed on the isolation cover (18) along the circumferential direction of the main axis (11).

7. A permanent magnet synchronous motor, including a motor housing (26), characterized in that: It includes an electric motor rotor as described in any one of claims 1 to 6; The motor housing (26) contains a motor stator (27), and the motor rotor passes through the motor stator (27) and is connected to the motor housing (26) at both ends.

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