Rotor structure of high-speed permanent magnet synchronous motor

Abstract

The utility model relates to the technical field of permanent magnet motors, in particular to a rotor structure of a high-speed permanent magnet synchronous motor, which comprises a main shaft, a rotor core, a permanent magnet, a first permanent magnet pressing plate, a second permanent magnet pressing plate and a shaft sleeve, the two ends of the rotor iron core are pressed by the first permanent magnet pressing plate and the second permanent magnet pressing plate respectively, the shaft sleeve is installed at one end of the main shaft and presses the first permanent magnet pressing plate, a key groove is formed in the outer portion of the main shaft, and a connecting piece is installed in the key groove. The stability of the rotor structure can be improved, the manufacturing cost is reduced, and installation is convenient.

Description

Technical Field

[0001] The present application relates to the technical field of permanent magnet motors, and in particular to a rotor structure of a high-speed permanent magnet synchronous motor. Background Art

[0002] As a high-efficiency and energy-saving electric motor, permanent magnet synchronous motor has the advantages of simple structure, small size, high power density, fast response and high efficiency. It is widely used in the fields of new energy commercial vehicles and electric vehicles.

[0003] At present, the power system of electric vehicles is increasingly inclined to use a combination of motors and gearboxes to provide large torque and a wide speed regulation range. This requires the motor to have a higher speed. The rotor, as the rotating part of the motor, needs to have a safe and reliable structure. However, many rotor structures currently require the assembly of multiple parts to be realized. This structure is not only complex and has weak assembly stability, but also inconvenient for operators to install the rotor structure, resulting in high production costs. Summary of the invention

[0004] In order to simplify the rotor structure, the present application provides a rotor structure of a high-speed permanent magnet synchronous motor, which can improve the stability of the rotor structure, reduce the cost, and facilitate installation.

[0005] The present application provides a rotor structure of a high-speed permanent magnet synchronous motor, which adopts the following technical solution:

[0006] A rotor structure of a high-speed permanent magnet synchronous motor includes a main shaft, a rotor core, a permanent magnet, a first permanent magnet pressure plate, a second permanent magnet pressure plate, and a shaft sleeve. The rotor core has a mounting groove, the permanent magnet is embedded in the mounting groove, the two ends of the rotor core are respectively pressed by the first permanent magnet pressure plate and the second permanent magnet pressure plate, the shaft sleeve is installed at one end of the main shaft and presses the first permanent magnet pressure plate, the main shaft is provided with a keyway on the outside, and a connecting piece is installed in the keyway.

[0007] By adopting the above technical solution, a rotor structure can be constructed only by using parts such as the main shaft, rotor core, connecting parts, the first permanent magnet pressure plate, the second permanent magnet pressure plate and the shaft sleeve. The number of parts is small, material management and installation are convenient, the installation stability is high, the structure is simple, the installation is convenient, and the cost can be reduced.

[0008] Preferably, the connecting member is a flat key.

[0009] By adopting the above technical solution, the flat key has a larger contact area compared with other connecting keys, thereby increasing the contact area between the connecting parts, the main shaft, and the rotor core, so that the load-bearing capacity is higher and the stability is stronger. Moreover, the flat key has a simple structure, which is convenient for operators to disassemble and assemble it when replacing or repairing it. The cost is also low, which meets production needs.

[0010] Preferably, the rotor core and the main shaft are interference fit.

[0011] By adopting the above technical solution, the interference fit can effectively reduce the gap between the rotor core and the main shaft, making the two more closely connected together, which helps to improve transmission efficiency and reduce energy loss. It can also increase the contact area between the rotor core and the main shaft, which helps to improve the overall rigidity and stability of the system, reduce deformation and vibration, and is beneficial to improving the accuracy and reliability of the equipment, ensuring transmission accuracy, and increasing carrying capacity.

[0012] Preferably, there is one keyway, and the radial displacement of the rotor core is fixed by the interference fit of the keyway between the main shaft and the rotor core and the flat key.

[0013] By adopting the above technical solution, there is only a single keyway on the main shaft, and the flat key is installed in the keyway. The radial displacement of the rotor core is fixed by the interference fit of the keyway between the main shaft and the rotor core and the flat key. The structure is simple and the installation stability is high.

[0014] Preferably, the main shaft, the rotor core, the first permanent magnet pressure plate, the second permanent magnet pressure plate, and the shaft sleeve are coaxially arranged.

[0015] By adopting the above technical solution, the stability of the entire rotor structure can be improved, ensuring that it remains relatively stable and reliable during rotation, reducing the eccentricity and stability of the rotor structure, and helping to optimize the magnetic field distribution, so as to increase the magnetic field strength and consistency of the permanent magnet. The coaxial setting can also ensure the matching accuracy and axial alignment between the main shaft and the rotor core, thereby ensuring the transmission efficiency.

[0016] Preferably, the main shaft has a shoulder step, and the rotor core is pressed against the shoulder step.

[0017] By adopting the above technical solution, good contact between the rotor core and the shaft shoulder step can be ensured, and sufficient fastening force can be provided to prevent the rotor core from loosening or falling off during high-speed rotation, which helps to improve the stability and reliability of assembly, while reducing vibration and noise to ensure the normal operation of the equipment.

[0018] Preferably, there are a plurality of the mounting grooves, and the plurality of mounting grooves are evenly distributed along the same circumferential line of the end surface of the rotor core.

[0019] By adopting the above technical solution, the weight of the rotor is made more balanced during rotation, vibration and unbalanced force are reduced, and the running stability and reliability of the equipment are improved.

[0020] Preferably, the installation slot includes a first slot body and a second slot body, and permanent magnets are installed in the first slot body and the second slot body, and the two permanent magnets form a "V"-shaped structure.

[0021] By adopting the above technical solution, the V-shaped structure can increase the magnetic field interaction between permanent magnets, thereby enhancing the strength of the overall magnetic field, reducing the magnetic resistance of the iron core, enhancing the uniformity of the magnetic field, and can also increase the number and position of permanent magnets, thereby increasing the generation and transmission of torque.

[0022] Preferably, a hollow groove is formed through the middle part of the rotor core along the axial direction, and a connecting groove is formed through the middle part of the first permanent magnet pressure plate and the second permanent magnet pressure plate along the axial direction, and the hollow groove is arranged opposite to the connecting groove.

[0023] By adopting the above technical solution, the provision of the hollow grooves and the connecting grooves can reduce the weight of the rotor structure, making the structure lighter and saving materials.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The rotor structure can be constructed by only using the main shaft, rotor core, connector, first permanent magnet pressure plate, second permanent magnet pressure plate and sleeve and other parts, with a small number of parts, convenient material management and installation, high installation stability, simple structure, convenient installation, and cost reduction;

[0026] 2. Interference fit can effectively reduce the gap between the rotor core and the main shaft, making the two more closely connected, which helps to improve transmission efficiency and reduce energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the rotor structure in the embodiment of the present application.

[0028] Figure 2 yes Figure 1 sectional view of .

[0029] Figure 3 yes Figure 1 Exploded diagram.

[0030] Figure 4 It is a schematic diagram of the rotor core, the first permanent magnet pressure plate, and the main shaft structure in an embodiment of the present application.

[0031] Explanation of the accompanying drawings: 1. Main shaft; 11. Keyway; 12. Shoulder step; 2. Rotor core; 21. Mounting groove; 211. First groove body; 212. Second groove body; 22. Hollow groove; 3. Permanent magnet; 4. First permanent magnet pressure plate; 41. Connecting groove; 5. Second permanent magnet pressure plate; 6. Bushing; 7. Connecting piece. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-4 This application is described in further detail.

[0033] An embodiment of the present application discloses a rotor structure of a high-speed permanent magnet synchronous motor.

[0034] Reference Figure 1 and Figure 2 A rotor structure of a high-speed permanent magnet synchronous motor includes a main shaft 1, a rotor core 2, a permanent magnet 3, a first permanent magnet pressure plate 4, a second permanent magnet pressure plate 5, and a sleeve 6. The rotor core 2 has a mounting groove 21, and the permanent magnet 3 is embedded in the mounting groove 21. The two ends of the rotor core 2 are respectively pressed by the first permanent magnet pressure plate 4 and the second permanent magnet pressure plate 5. The sleeve 6 is installed at one end of the main shaft 1 and presses the first permanent magnet pressure plate 4. A keyway 11 is opened on the outside of the main shaft 1, and a connecting piece 7 is installed in the keyway 11.

[0035] In the present application, a rotor structure can be constructed only by using parts such as the main shaft 1, the rotor core 2, the connecting piece 7, the first permanent magnet pressure plate 4, the second permanent magnet pressure plate 5 and the shaft sleeve 6. The rotor structure has a small number of parts, is convenient for material management and installation, has high installation stability, a simple structure, is easy to install, and can reduce costs.

[0036] Reference Figure 2 and Figure 3 The connecting piece 7 is a flat key, and there is only one keyway 11. The rotor core 2 and the main shaft 1 have an interference fit. Specifically, the rotor core 2 and the shaft can be assembled by interference shrink fitting, interference cold pressing, interference knurling, or interference rib beading, so that the main shaft 1 and the keyway 11 of the rotor core 2 interfere with each other and the flat key fixes the radial displacement of the rotor core 2.

[0037] Compared with other connecting keys, the flat key has a larger contact area, thereby increasing the contact area between the connecting piece 7, the main shaft 1, and the rotor core 2, making the load-bearing capacity higher and the stability stronger. The interference fit can effectively reduce the gap between the rotor core 2 and the main shaft 1, making the two more closely connected together, which helps to improve the transmission efficiency.

[0038] Reference Figure 3 and Figure 4The main shaft 1, the rotor core 2, the first permanent magnet pressure plate 4, the second permanent magnet pressure plate 5, and the shaft sleeve 6 are coaxially arranged. The main shaft 1 has a shoulder step 12, so that the rotor core 2 is pressed against the shoulder step 12 to ensure good contact between the rotor core 2 and the shoulder step 12 and provide sufficient fastening force. In this application, the first permanent magnet pressure plate 4, the second permanent magnet pressure plate 5, and the rotor core 2 are axially fixed by means of the shoulder step 12 and the shaft sleeve 6 reinforcement.

[0039] In this application, reference is made to Figure 3 and Figure 4 The rotor core 2 has multiple mounting grooves 21, and the multiple mounting grooves 21 are evenly distributed along the same circumferential line of the end surface of the rotor core 2. The mounting groove 21 includes a first groove body 211 and a second groove body 212. The first groove body 211 and the second groove body 212 are both equipped with permanent magnets 3. The two permanent magnets 3 form a "V"-shaped structure. The V-shaped structure can increase the magnetic field interaction between the permanent magnets 3, thereby enhancing the strength of the overall magnetic field, reducing the magnetic resistance of the core, and enhancing the uniformity of the magnetic field. It can also increase the number and position of the permanent magnets 3, thereby increasing the generation and transmission of torque.

[0040] A hollow groove 22 is formed through the rotor core 2 along the middle of its axial direction, and a connecting groove 41 is formed through the first permanent magnet pressure plate 4 and the second permanent magnet pressure plate 5 along the middle of their axial direction. The hollow groove 22 is arranged opposite to the connecting groove 41. The number of the hollow grooves 22 and the connecting grooves 41 can be adjusted according to actual conditions, but the number of the two is required to be consistent. By providing the hollow grooves 22 and the connecting grooves 41, the weight of the rotor structure can be reduced, the structure can be made lighter, and materials can be saved.

[0041] The principle of the rotor structure of the present application is: with the main shaft 1 as the guide, the flat key, the first permanent magnet pressure plate 4 and the second permanent magnet pressure plate 5, the rotor core 2, the permanent magnet 3 are respectively installed in the axial direction, and fixed on the main shaft 1 through the sleeve 6. During the installation process, it is required that the connection part 7 and the main shaft 1 are clearance fit, the first permanent magnet pressure plate 4 and the main shaft 1, the second permanent magnet pressure plate 5 and the main shaft 1 are clearance fit, the rotor core 2 and the main shaft 1 are interference fit, and the sleeve 6 and the main shaft 1 are interference fit. The rotor structure of the present application is simple, the structure is safe and reliable, the stability is high, it is easy to install, and the cost is low.

[0042] The above are all preferred embodiments of the present application. The embodiments are only explanations of the present application and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A rotor structure of a high-speed permanent magnet synchronous motor, characterized in that: The invention comprises a main shaft (1), a rotor core (2), a permanent magnet (3), a first permanent magnet pressure plate (4), a second permanent magnet pressure plate (5), and a shaft sleeve (6); the rotor core (2) has a mounting groove (21), the permanent magnet (3) is embedded in the mounting groove (21), two ends of the rotor core (2) are respectively pressed by the first permanent magnet pressure plate (4) and the second permanent magnet pressure plate (5), the shaft sleeve (6) is installed at one end of the main shaft (1) and presses the first permanent magnet pressure plate (4), and a keyway (11) is provided on the outside of the main shaft (1), and a connecting piece (7) is installed in the keyway (11).

2. The rotor structure of a high-speed permanent magnet synchronous motor according to claim 1, characterized in that: The connecting piece (7) is a flat key.

3. The rotor structure of a high-speed permanent magnet synchronous motor according to claim 2, characterized in that: The rotor core (2) and the main shaft (1) are interference fit.

4. The rotor structure of a high-speed permanent magnet synchronous motor according to claim 2 or 3, characterized in that: The keyway (11) has one, and the radial displacement of the rotor core (2) is fixed by the interference fit between the keyway (11) of the main shaft (1) and the rotor core (2) and the flat key.

5. The rotor structure of a high-speed permanent magnet synchronous motor according to claim 4, characterized in that: The main shaft (1), the rotor core (2), the first permanent magnet pressure plate (4), the second permanent magnet pressure plate (5), and the shaft sleeve (6) are coaxially arranged.

6. The rotor structure of a high-speed permanent magnet synchronous motor according to claim 2, characterized in that: The main shaft (1) has a shaft shoulder step (12), and the rotor core (2) is pressed against the shaft shoulder step (12).

7. The rotor structure of a high-speed permanent magnet synchronous motor according to claim 4, characterized in that: There are a plurality of mounting grooves (21), and the plurality of mounting grooves (21) are evenly distributed along the same circumferential line of the end surface of the rotor core (2).

8. The rotor structure of a high-speed permanent magnet synchronous motor according to claim 4, characterized in that: The installation groove (21) comprises a first groove body (211) and a second groove body (212), wherein the first groove body (211) and the second groove body (212) are both equipped with permanent magnets (3), and the two permanent magnets (3) form a "V"-shaped structure.

9. A rotor structure of a high-speed permanent magnet synchronous motor according to any one of claims 5 to 8, characterized in that: The rotor core (2) is provided with a hollow groove (22) extending through the middle of the axial direction thereof, and the first permanent magnet pressure plate (4) and the second permanent magnet pressure plate (5) are provided with a connecting groove (41) extending through the middle of the axial direction thereof, and the hollow groove (22) and the connecting groove (41) are arranged opposite to each other.

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