Novel three-phase transformer integrated with filter inductor
By adopting a single-stage secondary core structure in a three-phase transformer, the vibration and noise problems of the transformer caused by the complex secondary core structure in the prior art are solved, and the structure simplification and manufacturing labor hours are reduced.
Patent Information
- Application Number
- CN202420282503.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-06
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-02-06
AI Technical Summary
In the existing three-phase transformers, the secondary core structure design is complex, resulting in transformer vibration and noise problems, and the assembly is complicated and the working time is long.
The single-stage secondary iron core structure is adopted to remove the traditional secondary iron core iron yoke and its fixed structure, and replace the multi-stage core column stacking with a single core column, simplifying the assembly process, and leaving an air gap between the discus to reduce magnetoresistance.
The structure is simplified, the transformer noise and vibration are reduced, the manufacturing time is reduced, and the assembly process is simplified.
Smart Images
Figure CN222440314U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a novel three-phase transformer with integrated filter inductor. Background Art
[0002] At present, in the traction system of rail transit vehicles, the auxiliary power supply of the vehicle is provided by the auxiliary converter. The auxiliary converter converts the vehicle DC power supply into a three-phase AC power supply, and then the three-phase auxiliary transformer steps down the three-phase power supply to the civilian voltage. Since a large number of harmonics generated by the inverter will be transmitted to downstream electrical equipment through the three-phase auxiliary transformer, a three-phase filter inductor needs to be connected in series in the circuit. The principle is as follows Figure 1 As shown, L1 is the integrated filter inductor and L2 is the transformer leakage inductor. This three-phase filter inductor is realized by setting a secondary iron core 3 between the primary and secondary transformer coils of the three-phase auxiliary transformer. Figure 2 , 3 As shown, it is necessary to adopt structures such as the auxiliary iron core yoke 1 and the auxiliary iron core column assembly 2. In the prior art, the structural design of the auxiliary iron core is mostly composed of multiple discs and multiple air gap plates, such as Figure 5 As shown, there are many disadvantages, such as small size of discus punching sheets, large number of sheets, long working hours for stacking, difficulty in fixing the auxiliary core yoke, complex assembly, and easy to cause transformer vibration and noise. Summary of the invention
[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a novel three-phase transformer with integrated filter inductor, which adopts a single-section auxiliary iron core structure and has a simple structure and can reduce transformer noise and vibration.
[0004] In order to solve the above technical problems, the technical solution of the utility model is:
[0005] A novel three-phase transformer with integrated filter inductor, comprising a three-phase main iron core, wherein each phase main iron core is provided with a secondary coil, a secondary iron core and a primary coil, wherein the secondary coil is arranged at the periphery of the main iron core, the outer wall of the secondary coil is covered with a shielding copper foil, the primary coil is arranged at the periphery of the secondary coil, and the secondary iron core is arranged between the secondary coil and the primary coil;
[0006] The secondary iron core includes a first clamping plate, a secondary iron core column, a second clamping plate and a grounding copper foil. The secondary iron core column is arranged between the first clamping plate and the second clamping plate. One end of the grounding copper foil is crimped between the first clamping plate and the secondary iron core column. The middle part of the grounding copper foil is in contact with the stacked end surface of the secondary iron core column. The other end of the grounding copper foil is crimped between the second clamping plate and the shielding copper foil.
[0007] Furthermore, heat dissipation holes are provided on both the first clamping plate and the second clamping plate.
[0008] Furthermore, the auxiliary core column is formed by stacking two discus, and an air gap is left between the two discus.
[0009] Furthermore, a first air duct is provided in the secondary coil, and a first air duct support strip is provided in the first air duct.
[0010] Furthermore, a second air duct is provided in the primary coil, and a second air duct support strip is provided in the second air duct.
[0011] Furthermore, a third air duct is provided between the secondary coil and the primary coil, and a third air duct support strip is provided in the third air duct.
[0012] The utility model adopts the above technical solution and adopts a new auxiliary iron core structure, thereby realizing the function of integrating the three-phase filter inductor on the three-phase transformer. The auxiliary iron core structure of the utility model can change the traditional multi-section auxiliary iron core into a single-section auxiliary iron core, and remove the traditional auxiliary iron core yoke and its fixing structure. The structure is simple, the grounding is convenient, the manufacturing time can be reduced, and the transformer noise and vibration can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a principle block diagram of the prior art three-phase filter inductor of the utility model;
[0014] Figure 2 It is a structural schematic diagram of the auxiliary iron core of the prior art three-phase auxiliary transformer of the utility model;
[0015] Figure 3 for Figure 2 AA section view;
[0016] Figure 4 This is a schematic structural diagram of a novel three-phase transformer with integrated filter inductor according to the utility model;
[0017] Figure 5 This is a schematic diagram of the installation of the auxiliary iron core of the utility model;
[0018] Figure 6 It is a structural schematic diagram of the auxiliary iron core of the utility model;
[0019] Figure 7 It is a schematic diagram of the structure of the grounding copper foil of the utility model;
[0020] Figure 8 It is a structural schematic diagram of the auxiliary iron core column of the utility model;
[0021] Fig. 9 It is a schematic diagram of the magnetic circuit after the three-phase auxiliary iron core of the utility model is assembled;
[0022] Fig.10It is a schematic structural diagram of each airway and airway support strip of the utility model. DETAILED DESCRIPTION
[0023] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.
[0024] like Figure 4 As shown, this embodiment provides a novel three-phase transformer with integrated filter inductor, which includes a three-phase main iron core 1, each phase main iron core 1 is provided with a secondary coil 2, a secondary iron core 3 and a primary coil 4, the secondary coil 2 is arranged on the outer periphery of the main iron core 1, the outer wall of the secondary coil 2 is covered with a shielding copper foil 5, the primary coil 4 is arranged on the outer periphery of the secondary coil 2, the secondary iron core 3 is arranged between the secondary coil 2 and the primary coil 4, and the filter inductor is realized by adding a secondary iron core 3 between the secondary coil 2 and the primary coil 4.
[0025] like Figure 5 , 6 As shown in Figures 7 and 8, the secondary iron core 3 of this embodiment includes a first clamping plate 31, a secondary iron core column 32, a second clamping plate 33 and a grounding copper foil 34. The secondary iron core column 32 is arranged between the first clamping plate 31 and the second clamping plate 33. One end of the grounding copper foil 34 is crimped between the first clamping plate 31 and the secondary iron core column 32. The middle part of the grounding copper foil 34 is in contact with the stacking end surface of the secondary iron core column 32. The other end of the grounding copper foil 34 is crimped between the second clamping plate 33 and the shielding copper foil 5, and is grounded through the lead wire of the shielding copper foil 5.
[0026] like Figure 5 As shown, in this embodiment, heat dissipation holes 35 are provided on the first clamping plate 31 and the second clamping plate 33 to increase the heat dissipation area.
[0027] like Figure 8 As shown, the secondary iron core column 32 of this embodiment is formed by stacking two discus 321, and an air gap 322 is left between the two discus 321. The middle part of the grounding copper foil 34 only needs to fit the end face of one discus 321 to achieve grounding of all the discus punching sheets. This embodiment replaces the stacked multiple core columns with a single core column, reducing the more than 10 core columns of the secondary iron core structure of the prior art to one section. A single core column is formed by stacking two discus 321, leaving only one air gap, simplifying the structure of the three-phase secondary iron core 3 and the secondary iron yoke assembly. After the UVW three-phase is assembled together, as shown Figure 1 As shown, the gaps between the single-phase secondary iron cores 3 naturally form the iron core air gap of the inductor, such as Fig. 9 As shown, the magnetic flux penetrates the air at the yoke end to form a magnetic circuit S.
[0028] like Fig.10As shown, the secondary coil 2 of this embodiment is provided with a first air duct 21, and a first air duct support strip 22 is provided in the first air duct 21. The primary coil 4 is provided with a second air duct 41, and a second air duct support strip 42 is provided in the second air duct 41. A third air duct 6 is provided between the secondary coil 2 and the primary coil 4, and a third air duct support strip 61 is provided in the third air duct 6. The air duct can force air cooling on the coil, which is convenient for air flow and heat dissipation. Before the transformer is dipped in paint, the secondary core 3 is assembled, clamped and fixed entirely by the primary coil 4 and the secondary coil 2 and the air duct support strip therebetween, and is reinforced by resin bonding after dipped in paint.
[0029] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A novel three-phase transformer with integrated filter inductor, characterized in that: It comprises a three-phase main iron core (1), each phase of the main iron core (1) is provided with a secondary coil (2), a secondary iron core (3) and a primary coil (4), the secondary coil (2) is arranged on the outer periphery of the main iron core (1), the outer wall of the secondary coil (2) is covered with a shielding copper foil (5), the primary coil (4) is arranged on the outer periphery of the secondary coil (2), and the secondary iron core (3) is arranged between the secondary coil (2) and the primary coil (4); The secondary iron core (3) comprises a first clamping plate (31), a secondary iron core column (32), a second clamping plate (33) and a grounding copper foil (34); the secondary iron core column (32) is arranged between the first clamping plate (31) and the second clamping plate (33); one end of the grounding copper foil (34) is crimped between the first clamping plate (31) and the secondary iron core column (32); the middle part of the grounding copper foil (34) is in contact with the stacked end surface of the secondary iron core column (32); and the other end of the grounding copper foil (34) is crimped between the second clamping plate (33) and the shielding copper foil (5).
2. The novel three-phase transformer with integrated filter inductor according to claim 1 is characterized in that: The first clamping plate (31) and the second clamping plate (33) are both provided with heat dissipation holes (35).
3. The novel three-phase transformer with integrated filter inductor according to claim 1 is characterized in that: The secondary iron core column (32) is formed by stacking two discus (321), and an air gap (322) is left between the two discus (321).
4. The novel three-phase transformer with integrated filter inductor according to claim 1 is characterized in that: A first air duct (21) is arranged in the secondary coil (2), and a first air duct support strip (22) is arranged in the first air duct (21).
5. The novel three-phase transformer with integrated filter inductor according to claim 1 is characterized in that: A second air duct (41) is arranged in the primary coil (4), and a second air duct support strip (42) is arranged in the second air duct (41).
6. The novel three-phase transformer with integrated filter inductor according to claim 1 is characterized in that: A third air channel (6) is provided between the secondary coil (2) and the primary coil (4), and a third air channel support strip (61) is provided in the third air channel (6).