Integrated design of auxiliary exciter, exciter rotor and bearing cover
By integrating the sub-excitation machine with the exciter rotor and bearing cover, the problems of oscillation and bearing force of the column pin structure are solved, and the axial length of the motor is shortened, material utilization and cost reduction are achieved.
Patent Information
- Application Number
- CN202411827106.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-04-04
AI Technical Summary
In the prior art, the design of the sub-excitation machine, the rotor and bearing cover of the exciter cause oscillation of the column pin structure, and the thermal expansion of the rotor causes the bearing force of the sub-excitation machine, which may cause bearing damage.
The integrated design of the secondary exciter, the exciter rotor and the bearing cover is adopted, including integrating the magnetic steel on the exciter rotor hub in the secondary exciter on the exciter rotor hub, and the secondary exciter stator coil is integrated on the bearing inner cover to form an integrated structure and canceling the original secondary exciter.
It effectively shortens the axial length of the motor, improves the utilization rate of materials, saves materials, reduces costs, and reduces the oscillation of the column pin structure.
Smart Images
Figure CN119765714A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of exciters, and in particular to an integrated design of an auxiliary exciter, an exciter rotor and a bearing cover. Background Art
[0002] Generally, the axial length of the rotor of a steam turbine generator with a flexible rotor structure is relatively long. When the motor is operating normally, the axial thermal expansion of the rotor will be relatively large due to the increase in temperature.
[0003] Since the main engine, excitation unit and auxiliary excitation machine are in series structure, the axial length of the generator is very long. The rotor part of the excitation machine is a cantilever structure with a long cantilever, so the bending disturbance at the end is large and the oscillation of the rotor end is also large.
[0004] In addition, the auxiliary exciter is connected to the end of the exciter rotor through a pin coupling. The vibration of the rotor end increases the force on the coupling pins, and the force on the pins evenly distributed on the coupling is uneven, which reduces the fatigue life of the pins. Secondly, since the rotor will expand due to heat, there must be enough space between the auxiliary exciter and the rotor, otherwise the auxiliary exciter bearing may be stressed, causing bearing damage. Summary of the invention
[0005] In view of the deficiencies of the prior art, the present invention provides an integrated design of the auxiliary exciter, the exciter rotor and the bearing cover, which overcomes the deficiencies of the prior art and effectively solves the problem of oscillation of the pin structure.
[0006] In order to achieve the above object, the present invention adopts the following technical solutions:
[0007] The integrated design of the auxiliary exciter, the exciter rotor and the bearing cover comprises an exciter housing, an auxiliary exciter is arranged inside the exciter housing, and an exciter rotor hub is arranged inside the auxiliary exciter, magnetic steel is arranged on the outer wall of the exciter rotor hub, a bearing inner cover is arranged on one side of the exciter rotor hub, and an auxiliary exciter stator coil is arranged on one side of the bearing inner cover.
[0008] Preferably, a bearing is installed inside the bearing inner cover.
[0009] Preferably, a top cover and a bottom cover are arranged inside the exciter housing, and a base is welded to the bottom outer wall of the bottom cover.
[0010] Preferably, the top cover and the bottom cover are rotatably connected with an organic shaft.
[0011] Preferably, a protective cover is provided on the top of the top cover, and an axial flow fan is installed on the outer wall of the bottom of the protective cover.
[0012] Preferably, a rotating rectifier is arranged inside the exciter housing.
[0013] Preferably, a pin coupling is installed on one end of the outer wall of the shaft.
[0014] The beneficial effects of the present invention are:
[0015] 1. The integrated design of the auxiliary exciter, the exciter rotor and the bearing cover of the present invention utilizes the advantages of the disc motor, changes the auxiliary exciter from the original radial magnetization motor to an axial magnetization motor, effectively shortens the overall axial length of the motor, and integrates the magnetic steel on the auxiliary exciter on the exciter rotor hub, and the auxiliary exciter stator coil is integrated on the bearing inner cover, which effectively improves the material utilization rate while shortening the motor bearing length;
[0016] 2. The integrated design of the auxiliary exciter, the exciter rotor and the bearing cover of the present invention integrates the exciter rotor and the auxiliary exciter rotor into an integrated structure, eliminates the original auxiliary exciter, shortens the axial length of the motor, saves materials and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 The overall structure of the integrated design of the auxiliary exciter, exciter rotor and bearing cover proposed by the present invention is shown in FIG. Figure 1 ;
[0018] Figure 2 The overall structure of the integrated design of the auxiliary exciter, exciter rotor and bearing cover proposed by the present invention is shown in FIG. Figure 2 ;
[0019] Figure 3 This is an enlarged schematic diagram of the structure of part A of the integrated design of the auxiliary exciter, the exciter rotor and the bearing cover proposed in the present invention.
[0020] In the figure: 1. Exciter housing; 2. Auxiliary exciter; 3. Exciter rotor hub; 4. Magnetic steel; 5. Bearing inner cover; 6. Auxiliary exciter stator coil; 7. Bearing; 8. Top cover; 9. Machine shaft; 10. Protective cover; 11. Axial fan; 12. Rotating rectifier; 13. Pin coupling; 14. Bottom cover; 15. Base. DETAILED DESCRIPTION
[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.
[0022] Embodiment 1, refer to Figure 1 and Figure 3The integrated design of the auxiliary exciter, the exciter rotor and the bearing cover includes an exciter housing 1, an auxiliary exciter 2 is arranged inside the exciter housing 1, and an exciter rotor hub 3 is arranged inside the auxiliary exciter 2, and a magnetic steel 4 is arranged on the outer wall of the exciter rotor hub 3.
[0023] In this embodiment, the advantages of the disc motor are utilized, and the auxiliary exciter 2 is changed from the original radial magnetization motor to an axial magnetization motor, which effectively shortens the overall axial length of the motor, and the magnetic steel 4 on the auxiliary exciter 2 is integrated on the exciter rotor hub 3, and the auxiliary exciter stator coil 6 is integrated on the bearing inner cover 5, which effectively improves the material utilization rate while shortening the motor bearing length.
[0024] Example 2, refer to Figure 3 The auxiliary exciter is designed in an integrated manner with the exciter rotor and the bearing cover. A bearing inner cover 5 is provided on one side of the exciter rotor hub 3, and an auxiliary exciter stator coil 6 is provided on one side of the bearing inner cover 5.
[0025] In this embodiment, the exciter rotor and the auxiliary exciter rotor are integrated into an integral structure, the original auxiliary exciter 2 is eliminated, and the axial length of the motor is shortened, thus saving materials and reducing costs.
[0026] Reference Figure 3 A bearing 7 is installed inside the bearing inner cover 5.
[0027] Reference Figure 1-2 A top cover 8 and a bottom cover 14 are arranged inside the exciter housing 1, and a base 15 is welded to the outer wall of the bottom of the bottom cover 14.
[0028] Reference Figure 1-2 The top cover 8 and the bottom cover 14 are rotatably connected with an organic shaft 9 .
[0029] Reference Figure 1-2 A protective cover 10 is disposed on the top of the top cover 8 , and an axial flow fan 11 is installed on the outer wall of the bottom of the protective cover 10 .
[0030] Reference Figure 1-2 A rotating rectifier 12 is arranged inside the exciter housing 1.
[0031] Reference Figure 1-2 A pin coupling 13 is installed at one end of the outer wall of the shaft 9.
[0032] Working principle: The auxiliary exciter is integrated with the exciter rotor and the bearing cover into an integrated structure. By utilizing the advantages of the disc motor, the auxiliary exciter 2 is changed from the original radial magnetization motor to an axial magnetization motor, which effectively shortens the overall axial length of the motor, and the magnetic steel 4 on the auxiliary exciter 2 is integrated on the exciter rotor hub 3, and the auxiliary exciter stator coil 6 is integrated on the bearing inner cover 5. Compared with the original generator, the space of the exciter hub is utilized, the auxiliary exciter 2 is removed, and the inner space of the bearing cover is utilized, thereby shortening the axial length of the motor, saving materials and reducing costs.
[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. An integrated design of an auxiliary exciter, an exciter rotor and a bearing cover, comprising an exciter housing (1), characterized in that: An auxiliary exciter (2) is arranged inside the exciter housing (1), and an exciter rotor hub (3) is arranged inside the auxiliary exciter (2); a magnetic steel (4) is arranged on the outer wall of the exciter rotor hub (3); a bearing inner cover (5) is arranged on one side of the exciter rotor hub (3), and an auxiliary exciter stator coil (6) is arranged on one side of the bearing inner cover (5).
2. The integrated design of the auxiliary exciter, the exciter rotor and the bearing cover according to claim 1 is characterized in that: A bearing (7) is installed inside the bearing inner cover (5).
3. The integrated design of the auxiliary exciter, the exciter rotor and the bearing cover according to claim 1 is characterized in that: A top cover (8) and a bottom cover (14) are arranged inside the exciter housing (1), and a base (15) is welded to the outer wall at the bottom of the bottom cover (14).
4. The integrated design of the auxiliary exciter, the exciter rotor and the bearing cover according to claim 3 is characterized in that: The top cover (8) and the bottom cover (14) are rotatably connected with an organic shaft (9).
5. The integrated design of the auxiliary exciter, the exciter rotor and the bearing cover according to claim 1 is characterized in that: A protective cover (10) is arranged on the top of the top cover (8), and an axial flow fan (11) is installed on the outer wall of the bottom of the protective cover (10).
6. The integrated design of the auxiliary exciter, the exciter rotor and the bearing cover according to claim 1 is characterized in that: A rotating rectifier (12) is arranged inside the exciter housing (1).
7. The integrated design of the auxiliary exciter, the exciter rotor and the bearing cover according to claim 4 is characterized in that: A pin coupling (13) is installed at one end of the outer wall of the machine shaft (9).