A structure for a high-rotational-speed three-stage generator rotor

Abstract

The application discloses a structure of a high-speed three-stage generator rotor. The structure comprises a main generator rotor assembly, an exciter rotor assembly, a permanent magnet rotor assembly, a rotor shaft and bearings; the main generator rotor assembly, the exciter rotor assembly and the permanent magnet rotor assembly are coaxially arranged on the rotor shaft; bearings are arranged between one end of the rotor shaft, the exciter rotor assembly and the permanent magnet rotor assembly; the main generator rotor assembly comprises a main rotor triangular block and a coil fixing block; the main rotor triangular block is connected with the coil fixing block in a matched mode; a main rotor protection ring is arranged on a matched surface of the main rotor triangular block in an interference mode; an excitation rotor protection ring is arranged on an outer ring of a shaped winding; the excitation rotor protection ring is matched with an outer circle of an excitation coil; and a permanent magnet rotor protection ring is arranged on an outer circle of a magnetic steel. The application has the advantages of stable operation of the rotor at high speed, wide speed range, small vibration value, low noise, small mechanical wear, long service life and high safety.

Description

Technical Field

[0001] This invention relates to a structure for a high-speed three-stage generator rotor. More specifically, it is a structure for a high-speed three-stage generator rotor with a speed range of up to 30,000 rpm. Background Technology

[0002] High-speed generator rotors typically refer to those operating at speeds exceeding 10,000 rpm. The traditional three-stage generator rotor structure is as follows: Figure 1 As shown, the main structure consists of a rotor shaft, bearings, a main generator rotor assembly, an exciter rotor assembly, and a permanent magnet rotor assembly. These three types of rotors are coaxially mounted, with bearings installed at both ends of the rotor shaft (in some cases, one bearing is installed inside the permanent magnet rotor). The main generator rotor assembly typically uses rivets to secure a protective ring to the core. This protective ring radially fixes the coils, preventing displacement under centrifugal force. The exciter rotor assembly's protective ring is installed on the outer ring of the shaped windings, secured to the winding assembly by impregnation or potting. The permanent magnet rotor assembly's protective ring is generally installed on the outer circumference of the magnets using interference fitting or adhesive. This traditional three-stage generator rotor structure exhibits poor stability at high speeds exceeding 10,000 rpm. On one hand, the rotor structure cannot withstand the enormous centrifugal force at high speeds, potentially causing rotor deformation, severe damage such as rotor rubbing, or even motor disintegration. On the other hand, rotor imbalance cannot be precisely controlled; excessive rotor vibration at high speeds prevents normal generator operation, generates noise, accelerates bearing wear, shortens mechanical life, and leads to mechanical failures. In addition, the traditional three-stage generator rotor structure can only withstand a maximum speed of 16,000 rpm. When the speed exceeds 16,000 rpm, the vibration value is large, the stability is poor, the noise is high, and the service life is short, which cannot meet the ever-increasing demand for high speed generators.

[0003] Therefore, it is particularly important to develop a high-speed three-stage generator rotor structure that can operate normally in a higher speed range and solve problems such as poor structural strength, large vibration, high noise, short service life, and unstable generator operation of the three-stage generator rotor at high speed. Summary of the Invention

[0004] The purpose of this invention is to provide a structure for a high-speed three-stage generator rotor, improving the rotor structure and optimizing the connection and fixing method of the protective ring. This results in a more reliable rotor structure after installation, capable of normal operation at high speeds up to 30,000 rpm, and especially suitable for ultra-high-speed three-stage generator rotors operating in the range of 16,000–30,000 rpm. It reduces vibration at these ultra-high speeds, improving generator operational stability. Experimental testing of the rotor's vibration acceleration and displacement before and after the improvement shows that the rotor optimized using this invention operates more smoothly with reduced vibration, ensuring that the vibration acceleration is less than [value missing] at high and ultra-high speeds. This invention meets the normal operating specifications of 5g and vibration displacement less than 30um. Simultaneously, it shortens the distance between the two bearings, increases the rotor's first-order frequency and critical speed (the critical speed far exceeds 30,000 rpm), and avoids resonance caused by the rotor reaching the critical speed (the critical speed of a traditional three-stage generator rotor structure is less than 16,000 rpm) during high-speed operation, thus preventing mechanical damage caused by resonance. It reduces rotor vibration at high speeds, while also reducing high-speed operating noise, mechanical wear, and increasing rotor lifespan, thus improving the safety of high-speed operation. This invention solves problems such as poor structural strength, high vibration, high noise, short service life, and unstable generator operation in three-stage motor rotors during high-speed operation.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: a structure for a high-speed three-stage generator rotor, characterized in that it includes a main generator rotor assembly, an exciter rotor assembly, a permanent magnet rotor assembly, a rotor shaft, and bearings;

[0006] The main generator rotor assembly, exciter rotor assembly, and permanent magnet rotor assembly are coaxially mounted on the rotor shaft;

[0007] Bearings are installed at one end of the rotor shaft and between the exciter rotor assembly and the permanent magnet rotor assembly;

[0008] The main generator rotor assembly includes a main rotor triangular block and a coil fixing block; the main rotor triangular block and the coil fixing block are connected in a mating manner.

[0009] The main rotor protective ring is interference-fitted with the main rotor triangular block mating surface and also interference-fitted with the rotor shaft;

[0010] The excitation rotor protective ring is installed on the outer ring of the shaped winding; the excitation rotor protective ring fits with the outer circle of the excitation coil and is interference-fitted with the rotor shaft;

[0011] The protective ring of the permanent magnet rotor is installed on the outer circle of the magnet.

[0012] In the above technical solution, the main rotor protective ring includes a large inner circle and a small inner circle; the large inner circle and the small inner circle are concentrically arranged; the large inner circle and the small inner circle are connected by a main rotor protective ring support structure.

[0013] In the above technical solution, the inner circle of the main rotor protective ring is interference-fitted with the mating surface of the main rotor triangular block, and the inner circle of the main rotor protective ring is interference-fitted with the rotor shaft.

[0014] In the above technical solution, the bottom of the coil fixing block is provided with mounting lugs and mating connectors; the main rotor protective ring is mated and connected with the outer ring of the coil fixing block and presses on the mounting lugs;

[0015] A connecting cavity is provided at the bottom of the triangular block of the main rotor;

[0016] Insert the fitting into the connecting cavity.

[0017] In the above technical solution, the exciter rotor assembly and the exciter rotor protective ring are made of the same material.

[0018] In the above technical solution, the excitation rotor protective ring includes a large inner circle of the excitation rotor protective ring, a small inner circle of the excitation rotor protective ring, and an inner concave structure;

[0019] The large inner circle and concave structure of the excitation rotor protective ring, and the small inner circle of the excitation rotor protective ring are all concentrically arranged, and the inner diameters decrease sequentially.

[0020] The large inner circle of the excitation rotor protective ring is connected to the outer side of the bottom of the concave structure through the excitation rotor protective ring connector; the small inner circle of the excitation rotor protective ring is set at the top of the concave structure.

[0021] Both the excitation rotor protective ring connector and the concave structure are provided with through holes.

[0022] In the above technical solution, the large inner circle of the excitation rotor protective ring is fitted with the outer circle of the excitation coil, and the small inner circle of the excitation rotor protective ring is interference-fitted with the rotor shaft.

[0023] The high speed in the structure for a high-speed three-stage generator rotor described in this invention refers to a speed within the range of 30,000 rpm, especially an ultra-high speed within the range of 16,000 to 30,000 rpm. This invention can reduce the vibration value at this ultra-high speed of 16,000 to 30,000 rpm and improve the operating stability of the generator.

[0024] The present invention has the following advantages:

[0025] The rotor of this invention operates stably at high speeds, has a wide applicable speed range (normal operation at high speeds within 30,000 rpm, especially capable of normal operation of ultra-high speed three-stage generator rotors with speed ranges of 16,000 to 30,000 rpm), low vibration, low noise, low mechanical wear, long service life, and high safety.

[0026] This invention improves the rotor structure and optimizes the connection and fixing methods of the protective ring, resulting in a more reliable rotor structure after installation. This allows for normal high-speed operation within a speed range of up to 30,000 rpm (especially suitable for ultra-high-speed three-stage generator rotors with a speed range of 16,000–30,000 rpm). Compared to the traditional three-stage generator rotor structure, which can only withstand a maximum speed of 16,000 rpm, this invention significantly improves the rotor structure's strength and greatly expands the high-speed operating range. Experimental testing of the rotor's vibration acceleration and displacement before and after the improvement shows that the rotor optimized using this invention operates more smoothly with reduced vibration. The rotor meets the requirements of vibration acceleration less than 5g and vibration displacement less than 30µm at high speeds. After optimization and improvement of the rotor structure, the distance between the two bearings is shortened, the first-order frequency and critical speed of the rotor are improved, and the critical speed is far exceeded 30,000 rpm. This avoids resonance caused by the rotor reaching the critical speed at high speeds, thus avoiding mechanical damage caused by resonance. The optimized rotor structure reduces vibration, reduces noise at high speeds, reduces mechanical wear, extends the rotor's service life, and improves the safety of the rotor at high speeds. It solves the problems of poor structural strength, large vibration, high noise, short service life, and unstable generator operation of three-pole motor rotors at high speeds. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the rotor structure of a conventional three-stage generator in an embodiment of the present invention.

[0028] Figure 2 This is a diagram of the rotor structure of a high-speed three-stage generator (i.e., the improved structure design I) in an embodiment of the present invention.

[0029] Figure 3 This is a schematic diagram of the rotor structure of the high-speed three-stage generator of the present invention.

[0030] Figure 4 This is a schematic diagram of the main generator rotor before the improvement of this embodiment of the invention.

[0031] Figure 5 This is a schematic diagram of the main rotor triangular block structure before the improvement of this embodiment of the invention.

[0032] Figure 6This is a diagram of the original main rotor protective ring structure (i.e., the improved structure design I) in an embodiment of the present invention.

[0033] Figure 7 This is a diagram of the improved coil fixing block structure (i.e., the improved structure design I) of an embodiment of the present invention.

[0034] Figure 8 The structural diagram of the left protective ring of the excitation rotor before the improvement in this embodiment of the invention (i.e., the improved structure design I).

[0035] Figure 9 The improved main rotor triangular block structure (i.e., the improved structural design II) of this invention is shown in the figure.

[0036] Figure 10 Figure 1 shows the improved main rotor protective ring structure (i.e., the improved structural design II) of this invention.

[0037] Figure 11 Figure 1 shows the improved excitation rotor protection ring structure (i.e., the improved structural design II) of this invention.

[0038] exist Figure 1 In the diagram, A1 represents the main rotor rivet.

[0039] Figure 4 Figure (a) is a perspective view of the main generator rotor (i.e., the improved structural design I) before the improvement of the embodiment of the present invention.

[0040] exist Figure 4 Figure (b) is a partial enlarged view of the main generator rotor (i.e., the improved structural design I) before the improvement of the embodiment of the present invention.

[0041] exist Figure 4 In Figure (a), A2 represents the fastening screw.

[0042] Figure 5 Figure (a) is a front view of the main rotor triangular block structure before the improvement of the embodiment of the present invention (i.e., the improved structure design I).

[0043] Figure 5 Figure (b) is a perspective view of the main rotor triangular block structure before the improvement in the embodiment of the present invention (i.e., the improved structure design I).

[0044] exist Figure 5 In Figure (b), A3 represents the triangular block mounting the ear block.

[0045] exist Figure 6 In the diagram, A4 represents a threaded hole.

[0046] exist Figure 8 In the diagram, A5 represents the mating surface between the excitation rotor protective ring and the inner ring.

[0047] exist Figure 9 In the diagram, A6 represents the mating surface between the coil fixing block and the protective ring.

[0048] In the diagram, 1-Main generator rotor assembly, 1.1-Main rotor triangular block, 1.11-Connecting cavity, 1.2-Coil fixing block, 1.21-Mounting lug, 1.22-Matching connector, 2-Exciter rotor assembly, 3-Permanent magnet rotor assembly, 4-Rotor shaft, 5-Bearing, 6-Main rotor protective ring, 6.1-Large inner circle of main rotor protective ring, 6.2-Small inner circle of main rotor protective ring, 6.3-Main rotor protective ring support structure, 7-Exciter rotor protective ring, 7.1-Large inner circle of exciter rotor protective ring, 7.2-Small inner circle of exciter rotor protective ring, 7.3-Concave structure, 7.4-Exciter rotor protective ring connector, 8-Permanent magnet rotor protective ring. Detailed Implementation

[0049] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, these descriptions do not constitute a limitation of the present invention and are merely illustrative. The advantages of the present invention will become clearer and easier to understand through this description.

[0050] Referring to the attached drawings, a structure for a high-speed three-stage generator rotor includes a main generator rotor assembly 1, an exciter rotor assembly 2, a permanent magnet rotor assembly 3, a rotor shaft 4, and a bearing 5.

[0051] The main generator rotor assembly 1, the exciter rotor assembly 2, and the permanent magnet rotor assembly 3 are coaxially mounted on the rotor shaft 4;

[0052] Bearings 5 ​​are respectively installed at one end of the rotor shaft 4 and between the exciter rotor assembly 2 and the permanent magnet rotor assembly 3. The main improvement of the rotor assembly structure is to adjust the position of the bearing 5 at one end, shorten the distance between the two bearings 5, and increase the first-order frequency and critical speed of the rotor. The critical speed can reach 50,000 rpm, far exceeding the maximum speed of 30,000 rpm. This can avoid resonance caused by the rotor reaching the critical speed when it is running at high speed, and avoid mechanical damage caused by resonance.

[0053] The main generator rotor assembly 1 includes a main rotor triangular block 1.1 and a coil fixing block 1.2; the main rotor triangular block 1.1 and the coil fixing block 1.2 are connected in a mating manner (e.g., Figure 8 As shown), the present invention integrates two parts (i.e., the main rotor triangular block 1.1 and the coil fixing block 1.2), which further improves the overall strength and integration, while also reducing the wear of parts under high speed conditions. In addition, it also facilitates the structural improvement and optimization of the main rotor protective ring 6.

[0054] The main rotor protective ring 6 is interference-fitted with the main rotor triangular block 1.1 and also interference-fitted with the rotor shaft 4 (e.g., Figure 9As shown), this improves the strength and rigidity of the protective ring itself, thereby enhancing the stability and durability of the rotor during high-speed operation.

[0055] The excitation rotor protective ring 7 is installed on the outer ring of the shaped winding; the excitation rotor protective ring 7 is fitted with the outer circle of the excitation coil and has an interference fit with the rotor shaft 4 (e.g., Figure 10 As shown), this improves the strength and rigidity of the protective ring itself, thereby enhancing the stability and durability of the rotor during high-speed operation.

[0056] The permanent magnet rotor protective ring 8 is installed on the outer circle of the magnet by interference fit or adhesive.

[0057] Furthermore, the main rotor protective ring 6 includes a large inner circle 6.1 and a small inner circle 6.2; the large inner circle 6.1 and the small inner circle 6.2 are concentrically arranged; the large inner circle 6.1 and the small inner circle 6.2 are connected by a main rotor protective ring support structure 6.3.

[0058] Furthermore, the inner diameter 6.1 of the main rotor protective ring is interference-fitted with the mating surface of the main rotor triangular block 1.1, and the inner diameter 6.2 of the main rotor protective ring is interference-fitted with the rotor shaft 4.

[0059] Furthermore, the bottom of the coil fixing block 1.2 is provided with mounting lugs 1.21 and mating connectors 1.22; the main rotor protective ring 6 is mated and connected to the outer ring of the coil fixing block 1.2 and presses on the mounting lugs 1.21;

[0060] A connecting cavity 1.11 is provided at the bottom of the main rotor triangular block 1.1;

[0061] The connector 1.22 is inserted into the connecting cavity 1.11.

[0062] Furthermore, the materials of the exciter rotor assembly 2 and the exciter rotor protective ring 7 are consistent, ensuring that their expansion and contraction coefficients are consistent when the temperature changes, and that the connection between the two will not loosen when affected by temperature changes, and that the connection is firm.

[0063] Furthermore, the excitation rotor protective ring 7 includes a large inner circle 7.1, a small inner circle 7.2, and a concave structure 7.3;

[0064] The large inner circle 7.1 of the excitation rotor protective ring, the concave structure 7.3, and the small inner circle 7.2 of the excitation rotor protective ring are all concentrically arranged, and their inner diameters decrease sequentially.

[0065] The large inner circle 7.1 of the excitation rotor protective ring is connected to the outer side of the bottom of the concave structure 7.3 through the excitation rotor protective ring connector 7.4; the small inner circle 7.2 of the excitation rotor protective ring is set at the top of the concave structure 7.3.

[0066] Both the excitation rotor protective ring connector 7.4 and the concave structure 7.3 are provided with through holes.

[0067] Furthermore, the large inner circle 7.1 of the excitation rotor protective ring is fitted with the outer circle of the excitation coil, and the small inner circle 7.2 of the excitation rotor protective ring is interference-fitted with the rotor shaft 4.

[0068] Example

[0069] The present invention will now be described in detail using an example of its application to an ultra-high speed three-stage generator rotor. This will also provide guidance for the application of the present invention to other high speed three-stage generator rotors.

[0070] In this embodiment, the rotor speed of a certain ultra-high speed three-stage generator is 30,000 rpm.

[0071] In this embodiment, the rotor of a certain ultra-high speed three-stage generator adopts the traditional three-stage generator rotor structure, as shown below. Figure 1 As shown, the main components consist of a rotor shaft, bearings, a main generator rotor assembly, an exciter rotor assembly, and a permanent magnet rotor assembly. These three types of rotors are coaxially mounted, with bearings installed at both ends of the rotor shaft (in some cases, one bearing is installed inside the permanent magnet rotor). The exciter rotor assembly's protective ring is mounted on the outer ring of the shaped winding and is fixed to the assembly by impregnation or potting. The permanent magnet rotor assembly's protective ring is generally installed on the outer circumference of the magnets using an interference fit or adhesive. This traditional three-stage generator rotor structure exhibits poor stability at high speeds exceeding 10,000 rpm. On one hand, the rotor structure cannot withstand the enormous centrifugal force generated by high speeds, potentially leading to rotor deformation, severe damage such as rotor rubbing, or even generator disintegration. On the other hand, rotor imbalance cannot be precisely controlled; excessive rotor vibration at high speeds can cause the generator to malfunction, generate noise, accelerate bearing wear, shorten its service life, and lead to mechanical failures. The high-speed vibration test data of the rotor based on the traditional three-stage generator rotor structure are shown in Table 1. As can be seen from Table 1, after the speed exceeds 10,000 rpm, the rotor vibration value increases rapidly. Only within 14,000 rpm can the normal use requirements of vibration acceleration value less than 5g and vibration displacement less than 30um be met. Moreover, the highest speed that the rotor structure strength can withstand is 16,000 rpm. The rotor will be damaged if the speed exceeds this maximum speed.

[0072] Table 1. Rotor vibration test data for traditional three-stage generator rotor structure.

[0073]

[0074]

[0075] Because this product operates at high speeds, traditional rotor structures are insufficient to meet its requirements. To reduce rotor vibration at high speeds, this embodiment employs the following improved structural design I, as follows: Figure 2 As shown in the figure. The main generator rotor protective ring and the triangular block connection and fixing structure are as follows: Figure 4 Figure (a) and Figure 4 As shown in Figure (b), the main rotor triangular block (as shown in Figure (b)) Figure 5 Figure (a) and Figure 4 (b) In the figure, the coil is fixed by passing through the iron core. There are mounting lugs at both ends of the triangular block. The set screw passes through the lugs and then connects to the main rotor protective ring (as shown in Figure b). Figure 6 ) Threaded hole fixing; the main rotor protective ring is fixed by fastening screws and triangular blocks, and the coil protective block is pressed against the iron core by the protective ring; coil fixing block (such as Figure 7 The bottom also has mounting lugs, and the protective ring presses onto the mounting lugs to fix the coil fixing block axially. The excitation rotor has a protective ring on the left side (e.g., Figure 8 The inner ring is interference-fitted with the rotor shaft, and the right-side protective ring is interference-fitted with the rotor shaft. Both are made of the same material to ensure that they will not loosen at any temperature. Table 2 shows the high-speed vibration test data of the rotor before the improvement using the method of this invention (i.e., the improved structural design I). As can be seen from Table 2, the overall strength of the improved structural design I is higher than that of the traditional three-pole motor rotor, meeting the rotor structural strength requirements within a speed range of 30,000 rpm. However, the measured vibration values ​​are unstable. Among rotors produced and assembled in the same batch, within a speed range of 30,000 rpm, some meet the requirements of vibration acceleration less than 5g and vibration displacement less than 30µm, while others are unqualified due to excessively high vibration values. The vibration magnitude and vibration displacement of a qualified rotor increase slowly and gradually, with occasional resonance points in between. When the speed reaches 28,000 rpm, the measured data are close to the limits required for vibration acceleration of less than 5g and vibration displacement of less than 30µm. In contrast, the vibration magnitude of an unqualified rotor varies greatly. At low speeds, it is not much different from a qualified rotor, but when the speed increases to above 20,000 rpm, the vibration magnitude increases significantly. When the speed reaches 22,000 rpm, it exceeds the normal operating requirements of vibration acceleration of less than 5g and vibration displacement of less than 30µm.

[0076] Table 2. Typical rotor vibration test data before the improvement of the method of the present invention in this embodiment.

[0077]

[0078]

[0079] To ensure that the rotor's vibration at ultra-high speeds meets the normal operating requirements of vibration acceleration less than 5g and vibration displacement less than 30µm, this embodiment performs secondary optimization based on the improved structural design I (i.e., optimizing the rotor assembly structure using this invention), and improves the fixing methods of the main generator rotor assembly and exciter rotor assembly (as improved structural design II), mainly targeting the main rotor triangular block, protective ring, and exciter rotor protective ring, as shown in the structural diagram below. Figure 3 As shown. Overall, the main improvement in the rotor assembly structure is the adjustment of the bearing position at one end, shortening the distance between the two bearings and increasing the rotor's first-order frequency and critical speed; detailed improvements mainly involve the structure and installation method of the protective ring and the triangular block. In this embodiment, the main improvements to the motor rotor used in this invention, besides the change in bearing position, are: 1) the main rotor triangular block (such as... Figure 9 1) Structural changes: The original triangular block and coil fixing block were separate parts; the improved version integrates these two parts, further enhancing overall strength. This also facilitates structural improvements to the main rotor protective ring; 2) Main rotor protective ring (such as...) Figure 10 1) The large inner circle is interference-fitted with the triangular block, and the small inner circle is interference-fitted with the rotor shaft, improving the strength and rigidity of the protective ring itself; 2) Excitation rotor protective ring (such as...) Figure 11 The large inner circle fits with the outer circle of the excitation coil, and the small inner circle is interference-fitted with the rotor shaft, improving the strength and rigidity of the protective ring itself. Table 3 shows the high-speed vibration test data of the rotor after the improvement using the method of this invention (i.e., improved structural design II). As can be seen from Table 3, the rotor's structural strength performance is stable within the speed range of 30,000 rpm. Compared to improved structural design I, the rotor improved by this invention in this embodiment has smaller vibration acceleration and vibration displacement values, and no vibration defects were found in the same batch of improved rotors. The vibration values ​​all meet the normal usage requirements of vibration acceleration less than 5g and vibration displacement less than 30µm, verifying the effectiveness of the improvement. The rotor improved by this invention in this embodiment operates smoothly at ultra-high speeds (30,000 rpm), and its structural strength meets the normal operation requirements for ultra-high speeds within the speed range of 30,000 rpm, with vibration values ​​meeting the normal usage requirements of vibration acceleration less than 5g and vibration displacement less than 30µm.

[0080] Table 3 Typical rotor vibration test data after improvement

[0081]

[0082]

[0083] Based on the above experimental data, this embodiment uses the method of the present invention to improve the rotor structure and optimizes the connection and fixing method of the protective ring, making the rotor structure more reliable after the installation of the three types of rotors, and able to meet the normal high-speed operation within the speed range of 30,000 rpm. Compared with the traditional three-stage generator rotor structure, which can only withstand a maximum speed of 16,000 rpm, the rotor structure of the present invention has significantly improved strength performance and greatly expanded the speed range for high-speed operation. Through testing, the vibration acceleration and vibration displacement of the rotor before and after the improvement of the present invention were measured. The actual measurement shows that the rotor optimized and improved by the present invention has a more stable operating state and a reduced vibration value, enabling the rotor to meet the normal use requirements of vibration acceleration less than 5g and vibration displacement less than 30um at high speed. After the rotor structure optimization and improvement, the distance between the two bearings is shortened, the first-order frequency and critical speed of the rotor are increased, and the critical speed is far beyond 30,000 rpm, avoiding resonance caused by the rotor reaching the critical speed at high speed, and avoiding mechanical damage caused by resonance. At the same time, the vibration of the rotor is reduced at high speed, while the high-speed operation noise of the rotor is reduced, mechanical wear is reduced, the working life of the rotor is increased, and the safety of the rotor at high speed is improved.

[0084] All other unspecified parts belong to the prior art.

Claims

1. A structure for a rotor of a high-speed three-stage generator, characterized in that: It includes a main generator rotor assembly (1), an exciter rotor assembly (2), a permanent magnet rotor assembly (3), a rotor shaft (4), and a bearing (5); The main generator rotor assembly (1), the exciter rotor assembly (2) and the permanent magnet rotor assembly (3) are coaxially mounted on the rotor shaft (4); Bearings (5) are respectively installed at one end of the rotor shaft (4) and between the exciter rotor assembly (2) and the permanent magnet rotor assembly (3); The main generator rotor assembly (1) includes a main rotor triangular block (1.1) and a coil fixing block (1.2); the main rotor triangular block (1.1) and the coil fixing block (1.2) are connected in a cooperative manner; The main rotor protective ring (6) is interference-fitted with the main rotor triangular block (1.1) and also interference-fitted with the rotor shaft (4); The excitation rotor protective ring (7) is installed on the outer ring of the shaped winding; the excitation rotor protective ring (7) is fitted with the outer circle of the excitation coil and is interference-fitted with the rotor shaft (4); The permanent magnet rotor protective ring (8) is installed on the outer circle of the magnet; The bottom of the coil fixing block (1.2) is provided with mounting lugs (1.21) and mating connectors (1.22); the main rotor protective ring (6) is mated with the outer ring of the coil fixing block (1.2) and presses on the mounting lugs (1.21); A connecting cavity (1.11) is provided at the bottom of the main rotor triangular block (1.1); Insert the fitting (1.22) into the connecting cavity (1.11).

2. The structure for a high-speed three-stage generator rotor according to claim 1, characterized in that: The main rotor protective ring (6) includes a large inner circle (6.1) and a small inner circle (6.2); the large inner circle (6.1) and the small inner circle (6.2) are concentrically arranged; the large inner circle (6.1) and the small inner circle (6.2) are connected by a main rotor protective ring support structure (6.3).

3. The structure for a high-speed three-stage generator rotor according to claim 1 or 2, characterized in that: The inner circle (6.1) of the main rotor protective ring is interference-fitted with the mating surface of the main rotor triangular block (1.1), and the inner circle (6.2) of the main rotor protective ring is interference-fitted with the rotor shaft (4).

4. The structure for a high-speed three-stage generator rotor according to claim 3, characterized in that: The exciter rotor assembly (2) and the exciter rotor protective ring (7) are made of the same material.

5. The structure for a high-speed three-stage generator rotor according to claim 4, characterized in that: The excitation rotor protective ring (7) includes a large inner circle (7.1), a small inner circle (7.2), and a concave structure (7.3); The large inner circle (7.1) and the concave structure (7.3) of the excitation rotor protective ring, and the small inner circle (7.2) of the excitation rotor protective ring are all concentrically arranged, and their inner diameters decrease sequentially. The large inner circle (7.1) of the excitation rotor protective ring is connected to the outer side of the bottom of the concave structure (7.3) through the excitation rotor protective ring connector (7.4); the small inner circle (7.2) of the excitation rotor protective ring is set at the top of the concave structure (7.3); A through-hole structure is provided on the concave structure (7.3).

6. The structure for a high-speed three-stage generator rotor according to claim 5, characterized in that: The large inner circle (7.1) of the excitation rotor protective ring is fitted with the outer circle of the excitation coil, and the small inner circle (7.2) of the excitation rotor protective ring is interference-fitted with the rotor shaft (4).

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