A rigid auxiliary exciter structure capable of shortening axial length
By adopting a rigidly connected secondary exciter structure in the synchronous generator, and using transition disks and bolts to connect the rotor and stator, the problems of shortening the axial length of the synchronous generator and connecting reliability are solved, achieving a more compact and stable structure.
Patent Information
- Application Number
- CN202411691520.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-04-04
AI Technical Summary
In the case of limited space, it is difficult to shorten the axial length of the existing synchronous generator, and the traditional elastic connections have problems of wear and installation instability.
The rigidly connected secondary exciter structure is adopted, and the secondary exciter rotor and stator are connected through transition plates and bolts, eliminating the arrangement of elastic couplings and shields and shortening the axial length.
The axial length of the synchronous generator is shortened, which improves the reliability and stability of the connection. It is suitable for occasions with limited space. It has a simple and compact structure and is suitable for lightweight design.
Smart Images
Figure CN119765737A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to an auxiliary exciter in a synchronous generator set, in particular to an auxiliary exciter with a shortened axial length and a rigidly connected rotor. Background Art
[0002] The existing synchronous generator structure is generally arranged with the auxiliary exciter stator on the non-drive end sliding bearing outer cover through the rotating rectifier shield, and the auxiliary exciter rotor is also connected to the non-drive end shaft through an elastic coupling, and two rolling bearings are required on both sides of the auxiliary exciter rotor for support. Therefore, the rear end of the synchronous generator shaft must have a certain length to complete the arrangement of the above components. Permanent magnets are arranged on the auxiliary exciter rotor. When the synchronous generator rotor is driven to rotate by the drive end equipment, the auxiliary exciter stator three-phase coil is cut by its rotor magnetic field, and three-phase alternating current is emitted. It is rectified into direct current by the automatic voltage regulator (AVR) and supplied to the stator pole coil of the exciter to generate the magnetic field of the exciter. The rotor three-phase coil of the exciter cuts the magnetic field to generate three-phase alternating current of the exciter rotor winding. The three-phase alternating current is rectified into direct current by the rotating rectifier and then supplied to the excitation coil on the synchronous generator rotor, thereby completing the excitation of the synchronous generator. In this traditional structure, the elastic coupling and bearing generally occupy an axial distance of about 120 mm. When the synchronous generator is installed in a ship or other place with limited on-site space, the problem of insufficient axial installation space for the synchronous generator is often encountered. Therefore, how to shorten the axial distance of the synchronous generator has become an urgent problem that needs to be solved on site.
[0003] The structure of the existing auxiliary exciter is generally split and elastically connected, that is, the auxiliary exciter rotor and the auxiliary exciter stator are separately set; during assembly, the auxiliary exciter stator is assembled on the rotating rectifier shield, and the auxiliary exciter rotor is connected to the elastic coupling through the rotating shaft to transmit torque, and the elastic coupling is elastically connected through the elastic pin sleeve. Therefore, in the actual operation of the motor, the elastic pin sleeve will be subjected to a certain torque when the generator is started and stopped, and the elastic pin sleeve made of rubber material will be worn due to reasons such as rotor misalignment, and it needs to be repaired and replaced in time, otherwise it may cause the installation bolts to loosen or even cut off. Therefore, the use of a more reliable rigid connection has become a difficult problem that needs to be overcome on site. Summary of the invention
[0004] The present invention provides an auxiliary exciter structure which can shorten the axial length and adopts a rigid connection, thereby solving the technical problem of how to shorten the axial length of the motor and achieve a more reliable connection.
[0005] In order to achieve the above object, the present invention adopts the following technical solutions:
[0006] A rigid auxiliary exciter structure capable of shortening the axial length comprises an auxiliary exciter rotor and an auxiliary exciter stator, wherein the auxiliary exciter rotor is connected by bolts through a transition plate to transmit torque, and the auxiliary exciter stator comprises an auxiliary exciter stator core, a rotating rectifier shield and an auxiliary exciter shield;
[0007] The auxiliary exciter stator core is arranged on the rotating rectifier shield, and the auxiliary exciter shield is fixed to the rotating rectifier shield by bolts in the circumferential direction;
[0008] An auxiliary exciter rotor disk is arranged inside the auxiliary exciter rotor, a magnetic steel and a magnetic steel pressure plate are arranged on the outer circle of the auxiliary exciter rotor disk, and a pressure plate clamping bolt is arranged between the magnetic steel pressure plate and the auxiliary exciter rotor disk.
[0009] As a preferred technical solution of the present invention, the auxiliary exciter stator core is installed on the stop of the rotating rectifier shield. In the radial direction, the gravity of the auxiliary exciter stator core is borne by the stop of the rotating rectifier shield, and is tightened and fixed by bolts in the axial direction.
[0010] As a preferred technical solution of the present invention, when disassembling, the auxiliary exciter shield can be pushed out through the reserved top screw holes on the rotating rectifier shield by screwing bolts into the ribs of the auxiliary exciter shield.
[0011] As a preferred technical solution of the present invention, the stator outgoing wires of the auxiliary exciter are connected by opening holes on both sides of the rotating rectifier shield and welding wire fixing frames to facilitate the connection of the outgoing wires.
[0012] The beneficial effects of the present invention are:
[0013] 1. The present invention installs the stator core of the auxiliary exciter on the rotating rectifier shield by bolts, and the auxiliary exciter rotor is rigidly connected to the rotating shaft through the rotor disk, thereby eliminating the traditional arrangement of the elastic coupling and the auxiliary exciter shield, and shortening the rotating shaft length of the synchronous generator;
[0014] 2. The present invention realizes the rigid structure of the auxiliary exciter and shortens the axial length. Different from the traditional auxiliary exciter installation mode, the present invention makes the generator design lightweight, saves axial space, has a simple and compact structure, and is easy to assemble, which has reference significance for other lightweight designs of generators. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.
[0016] Figure 1It is a structural schematic diagram of the auxiliary exciter of the present invention;
[0017] Figure 2 It is a structural schematic diagram of the auxiliary exciter rotor of the present invention;
[0018] Figure 3 It is a structural schematic diagram of the rotary rectifier shield of the present invention;
[0019] Figure 4 It is a structural schematic diagram of the auxiliary exciter rotor disk of the present invention.
[0020] In the figure: 1. transition plate; 2. auxiliary exciter rotor; 3. rotating rectifier shield; 4. auxiliary exciter shield; 5. auxiliary exciter stator core; 6. auxiliary exciter rotor plate; 7. magnet; 8. magnet pressure plate; 9. pressure plate clamping bolt. 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] Example 1, reference Figure 1-2 A rigid auxiliary exciter structure with a shortened axial length includes an auxiliary exciter rotor 2 and an auxiliary exciter stator. The auxiliary exciter rotor 2 is connected to the torque by bolts through a transition plate 1. The auxiliary exciter stator includes an auxiliary exciter stator core 5, a rotating rectifier shield 3 and an auxiliary exciter shield 4. The auxiliary exciter stator core 5 is arranged on the rotating rectifier shield 3. The auxiliary exciter shield 4 is fixed to the rotating rectifier shield 3 by bolts in the circumferential direction. An auxiliary exciter rotor disk 6 is arranged in the auxiliary exciter rotor 2. A magnetic steel 7 and a magnetic steel 8 are arranged on the outer circle of the auxiliary exciter rotor disk 6. A pressure plate clamping bolt 9 is arranged between the pressure plate 8 and the auxiliary exciter rotor disk 6. The auxiliary exciter stator core 5 is installed on the stop of the rotating rectifier shield 3. In the radial direction, the gravity of the auxiliary exciter stator core 5 is borne by the stop of the rotating rectifier shield 3, and it is fixed by tightening bolts in the axial direction. When the auxiliary exciter shield 4 is disassembled, it can be screwed into the bolts and pushed out of the rib plate of the auxiliary exciter shield 4 through the top screw holes reserved on the rotating rectifier shield 3. The auxiliary exciter stator output line adopts holes on both sides of the rotating rectifier shield 3 and welded with a wire frame to facilitate the connection of the lead-out line.
[0023] Embodiment 2, Figure 3 It shows the specific size of the rotating rectifier shield 3, where the stopper with a diameter of 440 mm is connected to the outer bearing cover, the stopper with a diameter of 368.3 mm is used to fix the auxiliary exciter stator core 5, the 8×M10 holes in the circumferential direction are the mounting holes of the auxiliary exciter shield 4, and the 2×M20×1.5 holes on both sides are the lead holes of the auxiliary exciter stator core 5. Figure 4It is a schematic diagram of the dimensions of the auxiliary exciter rotor 2, which is mainly designed by punching holes on both sides, fixing the permanent magnets by means of pressure plates, and designing fan-shaped grooves for corresponding weight reduction.
[0024] 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. A rigid auxiliary exciter structure capable of shortening the axial length, comprising an auxiliary exciter rotor (2) and an auxiliary exciter stator, characterized in that: The auxiliary exciter rotor (2) is connected by bolts through a transition plate (1) to transmit torque, and the auxiliary exciter stator comprises an auxiliary exciter stator core (5), a rotating rectifier shield (3) and an auxiliary exciter shield (4); The auxiliary exciter stator core (5) is arranged on the rotating rectifier shield (3), and the auxiliary exciter shield (4) is fixed to the rotating rectifier shield (3) by bolts in the circumferential direction; An auxiliary exciter rotor disk (6) is arranged inside the auxiliary exciter rotor (2), a magnetic steel (7) and a magnetic steel pressure plate (8) are arranged on the outer circle of the auxiliary exciter rotor disk (6), and a pressure plate clamping bolt (9) is arranged between the magnetic steel pressure plate (8) and the auxiliary exciter rotor disk (6).
2. A rigid auxiliary exciter structure capable of shortening the axial length according to claim 1, characterized in that: The auxiliary exciter stator core (5) is mounted on the stopper of the rotating rectifier shield (3), and in the radial direction, the gravity of the auxiliary exciter stator core (5) is borne by the stopper of the rotating rectifier shield (3), and is fixed in the axial direction by bolts.
3. A rigid auxiliary exciter structure capable of shortening the axial length according to claim 1, characterized in that: When disassembling, the auxiliary exciter shield (4) can be pushed out by screwing bolts into the reserved top screw holes on the rotating rectifier shield (3) and pushing them out from the rib plate of the auxiliary exciter shield (4).
4. A rigid auxiliary exciter structure capable of shortening the axial length according to claim 1, characterized in that: The auxiliary exciter stator outgoing wire adopts the method of opening holes on both sides of the rotating rectifier shield (3) and welding a wire fixing frame to facilitate the connection of the outgoing wire.