High-power three-phase annular transformer capable of dissipating heat by means of motor water jacket cooling

Abstract

The invention relates to the field of transformers, in particular to a high-power three-phase annular transformer capable of dissipating heat by means of water jacket cooling of a motor. The high-power three-phase annular transformer comprises a motor body, a shell of the motor body is of a double-layer structure, a cooling water channel is formed in the shell, and a water inlet and a water outlet which are communicated with the cooling water channel are further formed in the shell. A transformer main body is also fixed inside the motor main body, the transformer main body comprises an inner ring, a plurality of annularly distributed winding yokes are detachably connected to the circumferential outer wall of the inner ring, and a main pole coil and a secondary coil are wound on the winding yokes; and the inner ring and the winding yoke are bonded and fixed on the outer ring frame. According to the high-power three-phase annular transformer capable of cooling and dissipating heat by means of the motor water jacket, integrated design of the transformer and the motor is achieved, the transformer is compact in structure, small in size, light in weight and low in cost, meanwhile, heat dissipation is achieved by means of the motor water cooling shell, and the heat dissipation condition is superior to that of a conventional transformer.

Description

Technical Field

[0001] The present invention relates to the field of transformers, and in particular to a high-power three-phase toroidal transformer with cold heat dissipation by means of a motor water jacket. Background Art

[0002] The iron cores of traditional three-phase transformers are in the shape of "pin" or "day", and are divided into dry type and wet type. The dry type mostly uses air cooling or natural cooling, and the wet type mostly uses oil cooling. There is no integrated solution with motor heat dissipation. The application of high-efficiency motors is becoming more and more widespread. The permanent magnet motor with variable frequency drive is the main solution for the high-efficiency motor system to replace the original low-efficiency drive system. However, high-voltage power supply makes the volume and cost of motors and inverters relatively high, which hinders their application and promotion. For high-voltage power transmission, it becomes a better solution to step down the voltage near the application end.

[0003] However, the traditional transformer and its installation still have the following disadvantages: (1) The volume of a single transformer is large, and there is no separate space for placing the transformer at the application site; (2) After being integrated with the motor and inverter system, the system volume is large, and there is no installation space for most system transformations; (3) The heat dissipation condition of a conventional transformer is poor. Especially in an environment with explosion-proof requirements, the transformer is in an explosion-proof chamber and there is no sufficient heat exchange condition; (4) It is difficult to make a high-power three-phase transformer with the existing toroidal structure. And due to the magnetic circuit structure, the axial length is very long, which is not conducive to the compact design of the whole machine structure.

[0004] Therefore, it is necessary to provide a new high-power three-phase toroidal transformer with cold heat dissipation by means of a motor water jacket to solve the above technical problems. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides a high-power three-phase toroidal transformer with cold heat dissipation by means of a motor water jacket.

[0006] The high-power three-phase toroidal transformer with cold heat dissipation by means of a motor water jacket provided by the present invention includes a motor main body. The housing of the motor main body is double-layered, and a cooling water channel is arranged inside the housing. An inlet and an outlet communicating with the cooling water channel are also arranged on the housing; A transformer main body is also fixed inside the motor main body. The transformer main body includes an inner ring. The motor shaft of the motor main body penetrates through the inner ring concentrically. A plurality of annularly distributed and C-shaped winding yokes are detachably connected to the circumferential outer wall of the inner ring, and main pole coils and secondary coils are wound on the winding yokes; The inner ring and the winding yokes are adhesively fixed to an outer ring frame, and the outer ring frame contacts the inner wall of the housing of the motor main body.

[0007] Preferably, both the inner ring and the winding yoke are composed of a plurality of stacked and fixed silicon steel sheets, and an insulating coating is filled between adjacent two silicon steel sheets.

[0008] Preferably, there are multiple groups of dovetail grooves on the circumferential outer wall of the inner ring, and both ends of the winding yoke have integrally formed inserts, and the inserts are embedded into the dovetail grooves to realize the fixation of the inner ring and the winding yoke.

[0009] Preferably, the silicon steel sheet is a non-oriented silicon steel sheet.

[0010] Preferably, the distance between the main pole coil and the secondary coil is minimized without affecting the use, and a thermally conductive insulating material is filled between the main pole coil and the secondary coil.

[0011] Preferably, an insulating coating layer is wound outside the winding yoke and the main pole coil and secondary coil wound thereon.

[0012] Preferably, the thermally conductive insulating material includes a thermally conductive insulating sheet, a phase change thermally conductive insulating material, and a non-silicon thermal pad.

[0013] Preferably, the transformer body is integrally epoxy potted, and the potting material is epoxy resin.

[0014] Compared with the related art, the high-power three-phase toroidal transformer with motor water jacket cooling provided by the present invention has the following beneficial effects: 1. In this high-power three-phase toroidal transformer with motor water jacket cooling, for the transformer body, it is installed inside the motor body to realize the integrated design of the transformer and the motor. Therefore, the overall structure will be more compact, which can greatly reduce the volume and weight of the entire device, and at the same time can also reduce the production cost of the entire device; 2. The inner ring and the winding yoke are both installed on the outer ring frame, and the outer ring frame is installed inside the motor body to realize the stable installation of the iron core. The outer ring frame can be in direct contact with the inner wall of the motor body shell. Therefore, the heat generated by the winding itself can also be directly conducted into the cooling water channel. Therefore, the transformer body can be cooled by means of the water cooling structure of the motor body itself. Compared with traditional heat dissipation, the heat dissipation effect will be better. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of a preferred embodiment of the high-power three-phase toroidal transformer with motor water jacket cooling provided by the present invention; Figure 2 is a schematic structural diagram of the cooperation and connection between the inner ring and the winding yoke shown in the present invention; Figure 3 is a schematic structural diagram of the cooperation and connection between the winding yoke and the coil shown in the present invention; Figure 4 Schematic diagram of the epoxy potting structure of the inner ring and winding yoke shown in the present invention; Figure 5 Simulated magnetic circuit nephogram of the transformer shown in the present invention; Figure 6 Simulated voltage waveform diagram shown in the present invention.

[0016] Reference numerals in the figure: 1, motor main body; 2, cooling water channel; 3, water inlet; 4, water outlet; 5, transformer main body; 6, inner ring; 7, dovetail groove; 8, winding yoke; 9, insert block; 10, main pole coil; 11, secondary coil; 12, insulating coating; 13, epoxy resin; 14, outer ring frame. Specific embodiments

[0017] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, 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 used to limit the present invention.

[0018] The following describes in detail the specific implementation of the present invention with reference to specific embodiments.

[0019] Please refer to Figures 1 to 6 , a high-power three-phase toroidal transformer with motor water jacket cooling provided by an embodiment of the present invention, the high-power three-phase toroidal transformer with motor water jacket cooling includes a motor main body 1 and a transformer main body 5 installed inside the motor main body 1; For the motor main body 1; Please refer to Figure 1 , the motor main body 1 includes an external housing and an internal motor shaft, the housing is a double-layer structure, and there is a cooling water channel 2 for water-cooling heat dissipation inside the housing, and a water inlet 3 and a water outlet 4 communicating with the cooling water channel 2 are also provided on the housing.

[0020] It should be noted that: the housing in the motor main body 1 is a double-layer structure, that is, there is a cavity inside the housing, and a cooling water channel 2 is arranged inside the cavity, and the cooling water channel 2 is used for the diversion of circulating liquid (usually cold water or other refrigerants), so as to realize the water-cooling heat dissipation of the motor itself; For the complete water-cooling heat dissipation system in the motor main body 1, it includes a water pump, a cooling water channel 2, a water inlet 3 and a water outlet 4 communicating with the cooling water channel 2, and a circulating liquid flowing through the inside of the cooling water channel 2. When cooling down, the circulating liquid is introduced into the inside of the cooling water channel 2 along the water inlet 3 through the water pump, and during the operation of the motor, the heat generated by the rotor and winding will be conducted to the inside of the cooling water channel 2, and the circulating liquid absorbs the heat and takes away the heat until the circulating liquid is exported from the water outlet 4, and after the circulating liquid is cooled, it is reused to realize the heat dissipation of the motor main body 1.

[0021] For the transformer main body 5; Please refer to Figures 2 to 4 , for the transformer main body 5, it includes an inner ring 6, a winding yoke 8 and an outer ring frame 14. The inner ring 6 and the winding yoke 8 are both adhesively fixed on the outer ring frame 14, and the outer ring frame 14 contacts the inner wall of the housing of the motor main body 1. The motor shaft of the motor main body 1 penetrates through the inner ring 6 concentrically. The winding yoke 8 is multiple and C-shaped, detachably connected to the circumferential outer wall of the inner ring 6, and the main pole coil 10 and the secondary coil 11 are wound on the winding yoke 8; Regarding the composition and installation of the inner ring 6 and the winding yoke 8, both the inner ring 6 and the winding yoke 8 are composed of multiple silicon steel sheets stacked and fixed. An insulating coating is filled between adjacent two silicon steel sheets. There are multiple groups of dovetail grooves 7 on the circumferential outer wall of the inner ring 6. Both ends of the winding yoke 8 have integrally formed insertion blocks 9, and the insertion blocks 9 are inserted into the inside of the dovetail grooves 7 to realize the fixation of the inner ring 6 and the winding yoke 8. An insulating coating layer 12 is wound outside the winding yoke 8 and the main pole coil 10 and the secondary coil 11 wound on it.

[0022] It should be noted that: for the transformer main body 5, it is installed inside the motor main body 1 to realize the integrated design of the transformer and the motor. Therefore, the overall structure will be more compact, which can greatly reduce the volume and weight of the entire equipment, and at the same time can also reduce the production cost of the entire equipment; Regarding the iron core structure: The transformer main body 5 includes an inner ring 6 and a winding yoke 8. The main pole coil 10 and the secondary coil 11 are wound on the winding yoke 8. The inner ring 6 and the winding yoke 8 form an iron core structure, and the main pole coil 10 and the secondary coil 11 together form a winding structure. When an alternating current passes through the primary winding, an alternating magnetic field will be generated in the iron core. This alternating magnetic field will pass through the secondary winding and induce an electromotive force (voltage) in the secondary winding; Regarding the composition of the inner ring 6 and the winding yoke 8 as individual parts and the overall assembly: Both of them are composed of multiple silicon steel sheets stacked and fixed. An insulating coating is filled between adjacent silicon steel sheets. By coating an insulating layer between the silicon steel sheets, the silicon steel sheets can be effectively separated, increasing its resistance, thereby reducing eddy current loss. Moreover, if no insulation treatment is carried out, a large conductive loop will be formed between the silicon steel sheets, resulting in an increase in eddy current. The insulating coating can increase the resistance between the silicon steel sheets, reduce the eddy current, and thus reduce the iron loss; at the same time, dovetail grooves 7 are opened on the circumferential outer wall of the inner ring 6, and the winding yoke 8 has integrally formed insertion blocks 9. The insertion blocks 9 can be inserted into the inside of the dovetail grooves 7, thereby realizing the fixation of the inner ring 6 and the winding yoke 8. Compared with the traditional integral structure, this design can split the magnetic circuit, making it more convenient for production and manufacturing; For the silicon steel sheets that make up the inner ring 6 and the winding yoke 8, it is preferably non-oriented silicon steel sheets. The magnetic permeability in different directions of non-oriented silicon steel sheets has little difference (during the manufacturing process of non-oriented silicon steel sheets, no special orientation treatment is carried out, and its grains are randomly distributed, which means that there will be no significant difference in permeability in any direction. At the same time, due to the random distribution of grains, non-oriented silicon steel sheets have good isotropic characteristics. Isotropy means that the physical properties of the material are the same in all directions. Therefore, no matter from which direction the magnetic field acts, non-oriented silicon steel sheets can conduct magnetic flux evenly. The hysteresis loss and eddy current loss of non-oriented silicon steel sheets are relatively low. This is because its uniform grain structure reduces the movement resistance of magnetic domain walls, thereby reducing magnetic loss). Both the inner ring 6 and the winding yoke 8 are installed on the outer ring frame 14, and the outer ring frame 14 is installed inside the motor main body 1 to achieve stable installation of the iron core. The outer ring frame 14 can be in direct contact with the inner wall of the housing of the motor main body 1. Therefore, the heat generated by the winding itself can also be directly conducted into the cooling water channel 2. Thus, the heat dissipation and temperature reduction of the transformer main body 5 can be achieved by means of the water cooling structure of the motor main body 1 itself. Compared with traditional heat dissipation, the heat dissipation effect will be better. Regarding the winding structure: There is a certain gap between the main pole coil 10 and the secondary coil 11. According to different using devices, this spacing should be adjusted to the minimum state. At the same time, an insulating material with good thermal conductivity is filled in the gap. The preferred materials to be filled are heat-conducting insulating sheets, phase-change heat-conducting insulating materials, and non-silicon heat-conducting pads. These materials have good thermal conductivity and insulating properties, can effectively prevent the occurrence of electrical breakdown, and can improve the heat dissipation effect of the winding. At the same time, after the main pole coil 10 and the secondary coil 11 are wound, an insulating coating layer 12 needs to be covered on the outside, which can further improve the safety during use. Regarding the assembly and installation process of the transformer main body 5: (1) Separate installation of the inner ring 6 and the winding yoke 8: Stack and fix multiple silicon steel sheets together to form a complete inner ring 6 and winding yoke 8. (2) Installation of the main pole coil 10 and the secondary coil 11: Wind the main pole coil 10 and the secondary coil 11 on the winding yoke 8. After the winding of the coils is completed, fill the gap between the main pole coil 10 and the secondary coil 11 with an insulating material with good thermal conductivity, and finally cover an insulating coating layer 12 from the outside of the coils to achieve the assembly between the winding yoke 8 and the coils. (3) Installation between the inner ring 6, the winding yoke 8 and the outer ring frame 14: The winding yoke 8 is provided with inserts 9, and the circumferential outer wall of the inner ring 6 is provided with dovetail grooves 7. The inserts 9 can be directly embedded into the dovetail grooves 7 to fix the winding yoke 8. Moreover, the winding yoke 8 is C-shaped, and inserts 9 are provided at both ends thereof. Therefore, both ends can be fixed to the inner ring 6, making the winding yoke 8 have higher stability. After the two are assembled, a complete iron core structure is formed, and then the iron core structure can be fixed to the outer ring frame 14. After the fixation of the three is completed, epoxy potting is carried out, that is, the epoxy resin 13 is introduced into the central hole or other designated positions in the transformer; Installation of the transformer body 5 inside the motor: The potted outer ring frame 14 contacts the inner wall of the motor body 1 housing, so that heat conduction and heat exchange can be carried out to dissipate the heat of the transformer body 5.

[0023] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A high-power three-phase toroidal transformer with cooling by means of a motor water jacket, comprising a motor main body (1). The housing of the motor main body (1) is double-layered, and a cooling water channel (2) is arranged inside the housing. An inlet (3) and an outlet (4) communicating with the cooling water channel (2) are also arranged on the housing. It is characterized in that: A transformer main body (5) is also fixed inside the motor main body (1). The transformer main body (5) includes an inner ring (6). The motor shaft of the motor main body (1) concentrically penetrates through the inner ring (6). A plurality of annularly distributed and C-shaped winding yokes (8) are detachably connected to the circumferential outer wall of the inner ring (6). A main pole coil (10) and a secondary coil (11) are wound on the winding yokes (8); The inner ring (6) and the winding yokes (8) are adhesively fixed to an outer ring frame (14), and the outer ring frame (14) contacts the inner wall of the housing of the motor main body (1).

2. The high-power three-phase toroidal transformer cooled by means of a motor water jacket according to claim 1, characterized in that Both the inner ring (6) and the winding yokes (8) are composed of a plurality of silicon steel sheets stacked and fixed, and an insulating coating is filled between adjacent two silicon steel sheets.

3. The high-power three-phase toroidal transformer with motor water jacket cooling according to claim 2, characterized in that, There are multiple groups of dovetail grooves (7) on the circumferential outer wall of the inner ring (6). Both ends of the winding yoke (8) have integrally formed insertion blocks (9), and the insertion blocks (9) are inserted into the dovetail grooves (7) to realize the fixation of the inner ring (6) and the winding yoke (8).

4. The high-power three-phase toroidal transformer with motor water jacket cooling according to claim 2, characterized in that, The silicon steel sheet is a non-oriented silicon steel sheet.

5. The high-power three-phase toroidal transformer with motor water jacket cooling according to claim 1, characterized in that The distance between the main pole coil (10) and the secondary coil (11) takes the minimum value in a state where it does not affect the use, and a thermally conductive insulating material is filled between the main pole coil (10) and the secondary coil (11).

6. The high-power three-phase toroidal transformer with cooling by means of a motor water jacket according to claim 1, characterized in that, The thermally conductive insulating material includes a thermally conductive insulating sheet, a phase change thermally conductive insulating material, and a non-silicon thermally conductive pad.

7. The high-power three-phase toroidal transformer with motor water jacket cooling according to claim 6, characterized in that An insulating coating layer (12) is wound outside the winding yoke (8) and the main pole coil (10) and the secondary coil (11) wound thereon.

8. The high-power three-phase toroidal transformer with motor water jacket cooling according to claim 1, wherein The whole transformer main body (5) is epoxy potted, and the potting material is epoxy resin (13).

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