A highly stable exciter

Abstract

The present invention discloses a high-stability exciter, which is installed on the main shaft of the generator. The high-stability exciter includes: an armature assembly, which is sleeved on the main shaft of the generator and fixedly connected to the main shaft of the generator; and a stator assembly, which is arranged on the periphery of the armature assembly and can rotate relative to the stator assembly. The rotating part of the exciter provided by the present invention is in a suspended form. The exciter has the characteristics of simple structure, convenient manufacturing, and easy on-site installation. At the same time, compared with conventional exciters, this product directly installs the armature assembly of the exciter on the main shaft of the generator, reducing the exciter bearings, shortening the shaft system, reducing the vibration impact of on-site operation, and improving the stability of the unit operation. The entire exciter has a compact and integrated structure, good mechanical properties, and beautiful appearance.

Description

Technical Field

[0001] The present invention relates to the technical field of generator manufacturing, and in particular to a high-stability exciter. Background Art

[0002] The exciter is a crucial component of brushless AC generators. It's typically coaxial with the generator. Rotation of the generator's rotor shaft drives the exciter, providing the DC excitation current necessary to generate the generator's magnetic field. The AC power generated by the exciter is converted to DC by a rectifier system. This power is then fed to the generator's rotor via brushes and slip rings to create a DC magnetic field. As the rotor rotates, the magnetic lines of force create relative motion between the stator coils. The coils cut through these lines of force, inducing an electric potential in the stator coils, thus generating power. Therefore, the exciter is also known as the auxiliary exciter relative to the main generator. Market demand is driving the continuous reduction in the size and structure of exciters, with the goal of achieving smaller and more precise designs. This demands continuous advancement in exciter technology.

[0003] like Figure 1 As shown, the traditional exciter armature is an independent structure with a dedicated main shaft. A coupling is required to connect the generator's main shaft 1 to the exciter armature. The independent main shaft 01 makes the entire armature assembly more complex, resulting in a more complex and larger exciter structure. An independent bearing 02 is also required to support the exciter armature. During the production process, the independent assembly and complex structure of the exciter armature make production and pre-assembly relatively complex and difficult, requiring more labor and high costs.

[0004] Because the traditional exciter armature is a separate structure and also includes a separate bearing, on-site installation requires connecting the exciter shaft to the generator main shaft and installing the exciter bearing, making the installation process complex. In addition, the long generator shaft system increases the probability of operational vibration during operation. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies and provide a high-stability exciter to solve the technical problems in the prior art such as the complex structure of the exciter, the large size, the difficulty of on-site installation by the user, and the low operating stability of the exciter.

[0006] In order to achieve the above technical objectives, the technical solution of the present invention provides a high-stability exciter, which is installed on the main shaft of the generator, and the high-stability exciter includes:

[0007] An armature assembly, wherein the armature assembly is sleeved on the main shaft of the generator and is fixedly connected to the main shaft of the generator;

[0008] The stator assembly is arranged on the periphery of the armature assembly, and the armature assembly can be rotated relative to the stator assembly.

[0009] Furthermore, the main shaft of the generator is a spline shaft, the high-stability exciter also includes a spline sleeve, the armature assembly is fixed to the outer peripheral surface of the spline sleeve, and the spline sleeve is cooperatively connected to the spline shaft, and the head end of the main shaft of the generator is detachably connected to a limit baffle that limits the axial movement of the spline sleeve relative to the spline shaft.

[0010] Furthermore, the high-stability exciter further includes a front end cover and a rear end cover, and the axial ends of the stator assembly are respectively detachably fixedly connected to the front end cover and the rear end cover.

[0011] Furthermore, the head end of the main shaft of the generator and the armature assembly are both built into a cavity formed by the front end cover, the stator assembly and the rear end cover.

[0012] Furthermore, the high-stability exciter also includes a protective tube, one end of which is detachably fixedly connected to the front end cover, and the other end of which is detachably fixedly connected to the rear end cover, and the stator transfer assembly is fixed to the inner circumference of the protective tube.

[0013] Furthermore, the armature assembly, the stator assembly and the main shaft of the engine are coaxial.

[0014] Furthermore, a first docking flange is provided on one end of the front end cover close to the protective tube, and a second docking flange is provided on one end of the rear end cover close to the protective tube.

[0015] Furthermore, the inner edge of the first docking flange is provided with a first annular clamping protrusion extending in a direction close to the protective tube, and the inner edge of the second docking flange is provided with a second annular clamping protrusion extending in a direction close to the protective tube.

[0016] Compared with existing technologies, the present invention offers the following advantages: The exciter's rotating portion is suspended, resulting in a simple structure, easy manufacturing, and simple on-site installation. Furthermore, compared to conventional exciters, this product directly mounts the exciter's armature assembly on the generator's main shaft, eliminating the need for exciter bearings and shortening the shaft system. This reduces vibration during on-site operation and improves unit stability. The entire exciter boasts a compact, integrated structure, excellent mechanical performance, and an aesthetically pleasing appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the installation structure of the exciter in the prior art;

[0018] Figure 2 It is a schematic diagram of the installation structure of an embodiment of the exciter provided by the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0022] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0023] See also Figure 1 、 Figure 2 This embodiment provides a high-stability exciter, which is installed on the main shaft 1 of the generator. The high-stability exciter includes: an armature assembly assembly 2 and a stator assembly assembly 3.

[0024] The armature assembly assembly 2 is sleeved on the main shaft 1 of the generator, and the armature assembly assembly 3 is fixedly connected to the main shaft 1 of the generator. The stator assembly assembly 3 is arranged on the periphery of the armature assembly assembly 2, and the armature assembly assembly 2 can rotate relative to the stator assembly assembly 3. The armature assembly assembly 2 is composed of stacked silicon steel sheets with tooth-shaped cross-sections. The stator core of the stator assembly 3 is also composed of stacked silicon steel sheets. The inner circumference of the stator core is provided with large slots for placing excitation windings and small slots for placing armature windings. The armature assembly 2 can generate induced current by rotating relative to the stator assembly 3.

[0025] In order to protect the armature assembly assembly 2 and the stator assembly assembly 3, the high-stability exciter also includes a front end cover 4 and a rear end cover 5. The axial ends of the stator assembly 3 are respectively detachably fixedly connected to the front end cover 4 and the rear end cover 5. The head end of the main shaft 1 of the generator and the armature assembly 2 are both built into the cavity formed by the front end cover 4, the stator assembly assembly 3, and the rear end cover 5.

[0026] Specifically, the high-stability exciter also includes a protective tube 3a, one end of the protective tube 3a is detachably fixedly connected to the front end cover 4, and the other end of the protective tube 3a is detachably fixedly connected to the rear end cover 5, and the stator transfer assembly 3 is fixed to the inner circumferential surface of the protective tube 3a. Specifically, the front end cover 4 is provided with a first docking flange a1 at one end close to the protective tube 3a, and the rear end cover 5 is provided with a second docking flange a2 at one end close to the protective tube 3a. The inner edge of the first docking flange a1 is provided with a first annular clamping protrusion b1 extending in a direction close to the protective tube 3a, and the inner edge of the second docking flange a2 is provided with a second annular clamping protrusion b2 extending in a direction close to the protective tube 3a, so that the two ends of the protective tube 3a can be respectively connected to the first docking flange a1 and the second docking flange a2 by screws, and the outer circumferential surface of the first annular clamping protrusion b1 and the outer circumferential surface of the second annular clamping protrusion b2 can respectively abut against the protective tube 3a. The inner circumference of both ends, for example: in a preferred embodiment, the two ends of the protective tube 3a are interference fit with the first docking flange a1 and the second docking flange a2 respectively, and the protective tube 3a, the first docking flange a1, and the second docking flange a2 can all be made of stainless steel with a surface roughness value Ra≤0.05μm. The inner circumference of both ends of the protective tube 3a is electroplated with a copper coating, and the thickness of the copper coating can be selected from 0.1 to 0.2mm. The copper coating plays a role of metal flexible sealing. In another preferred embodiment, in. In this embodiment, the inner circumference of both ends of the protective tube 3a is electroplated with a first layer of copper plating, and the thickness of the copper plating is 0.1 mm. Subsequently, at least two second annular plating layers with a thickness of 0.1 mm are electroplated on the surface of the first layer of copper plating. An annular groove is formed between the two adjacent second layers of copper plating. It can be understood that the first layer of copper plating is coaxial with the second layer of copper plating, and the second layer of copper plating is formed on the surface of the first layer of copper plating. The annular groove is the spacing between the two adjacent second layers of copper plating, and the spacing space serves as a clearance space for the extrusion deformation of the copper plating. The main shaft 1 of the generator is a spline shaft, and the high-stability exciter also includes a spline sleeve 6. The armature assembly is fixed to the outer circumference of the spline sleeve 6, and the spline sleeve 6 is connected to the spline shaft. The head end of the main shaft 1 of the generator is detachably connected with a limit baffle 7 that limits the axial movement of the spline sleeve 6 relative to the spline shaft. The armature assembly assembly 2, the stator assembly assembly 3 and the main shaft 1 of the engine are coaxial.

[0027] This new exciter features a suspended rotating section, resulting in a simple structure, easy manufacturing, and simple on-site installation. Compared to conventional exciters, this new product reduces the number of exciter bearings and shortens the shaft system, minimizing vibrations during on-site operation and improving unit stability. The entire exciter boasts a compact, integrated structure and excellent mechanical performance.

[0028] The specific embodiments of the present invention described above do not limit the scope of protection of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A high stability exciter, mounted on the main shaft of a generator, characterized in that: The high stability exciter comprises: An armature assembly, wherein the armature assembly is sleeved on the main shaft of the generator and is fixedly connected to the main shaft of the generator; The stator assembly assembly is arranged on the periphery of the armature assembly assembly, and the armature assembly assembly can rotate relative to the stator assembly assembly; the high-stability exciter also includes a front cover and a rear cover, the axial ends of the stator assembly assembly are respectively detachably fixedly connected to the front cover and the rear cover, the head end of the main shaft of the generator and the armature assembly assembly are both built into the cavity formed by the front cover, the stator assembly assembly and the rear cover, the high-stability exciter also includes a protective tube, one end of the protective tube is detachably fixedly connected to the front cover, and the other end of the protective tube is detachably fixedly connected to the rear cover, and the stator transfer assembly is fixed to The inner circumferential surface of the protective tube; the front end cover is provided with a first docking flange at one end close to the protective tube, and the rear end cover is provided with a second docking flange at one end close to the protective tube, the inner edge of the first docking flange is provided with a first annular clamping protrusion extending in the direction close to the protective tube, and the inner edge of the second docking flange is provided with a second annular clamping protrusion extending in the direction close to the protective tube; the inner circumferential surface of both ends of the protective tube is electroplated with a first layer of copper plating, the thickness of the copper plating is 0.1mm, and then at least two 0.1mm thick second annular plating layers are electroplated on the surface of the first layer of copper plating, and annular grooves are formed between the two adjacent second layers of copper plating.

2. The high stability exciter according to claim 1, characterized in that: The main shaft of the generator is a spline shaft, and the high-stability exciter also includes a spline sleeve. The armature assembly is fixed to the outer peripheral surface of the spline sleeve, and the spline sleeve is cooperatively connected to the spline shaft. The head end of the main shaft of the generator is detachably connected to a limit baffle that limits the axial movement of the spline sleeve relative to the spline shaft.

3. The high stability exciter according to claim 1, characterized in that: The armature assembly, the stator assembly and the main shaft of the generator are coaxial.

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