Multi-voltage-class transformer

Abstract

The utility model discloses a transformer with multiple voltage levels. The transformer comprises an iron core, a first winding and a second winding, wherein the first winding and the second winding are wound on the iron core; the second winding comprises a first winding section and a plurality of second winding sections, and at least one of the plurality of second winding sections has one coil turn number; wherein taps are formed at the connecting position of the first winding section and the first second winding section and at the connecting position between the adjacent second winding sections, and the starting end, the tail end and the taps of the second winding are suitable for being externally connected to form multiple voltage grades. Parts or all of the wires of the second winding section are limited to be one turn, so that the risk of excessive winding or less winding is greatly reduced, and meanwhile, the winding efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of transformers, in particular to a transformer with multiple voltage levels. Background Art

[0002] A transformer is a device that uses the principle of electromagnetic induction to change AC voltage. Its main components are the primary coil (primary winding), the secondary coil (secondary winding) and the iron core (magnetic core). Both the primary coil and the secondary coil are formed by winding the surface-insulated wire along the iron core. The turns ratio of the primary coil and the secondary coil directly affects the transformer's transformation ratio. The winding personnel must strictly ensure that the number of turns is correct during the winding process. If the coil winding personnel mistakenly increase or decrease the number of turns of the primary coil or the secondary coil, the transformer's transformation ratio will change, affecting the transformer's performance. Especially for transformers with multiple voltage levels, a large number of coils need to be wound, and it is more likely to have too many or too few turns of the coil. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned defects or problems existing in the background technology and to provide a transformer with multiple voltage levels, which can facilitate the winding of primary windings and / or secondary windings with multiple taps, and different segments of coils at the tap positions will not be separated from each other.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] Technical Solution 1: A multi-voltage level transformer, comprising an iron core and a first winding and a second winding wound on the iron core; the second winding comprises a first winding section and a plurality of second winding sections, at least one of the plurality of second winding sections having a coil turn of 1 turn; wherein the connection position between the first winding section and the first second winding section, and the connection position between adjacent second winding sections, all form taps, and the starting end, the end end and each tap of the second winding are suitable for forming multiple voltage levels for external wiring.

[0006] Technical solution 2 is based on technical solution 1: the second winding is formed by a second conductor wound around the core column of the iron core. Except for the last second winding segment, the second conductor extends outward and winds back in the opposite direction when any winding segment is wound, so that the tap is formed at the connection position of the two winding segments.

[0007] Technical solution three, which is based on technical solution two: it also includes a bracket and a number of connectors for external wiring; the iron core is fixedly mounted on the bracket, the connector is fixedly mounted on the bracket, and is connected to the beginning and end of the first winding, the beginning and end of the second winding, and multiple taps.

[0008] Technical solution four is based on technical solution three: the connecting piece is connected to the corresponding tap through a terminal post, and the terminal post penetrates the corresponding tap along the thickness direction of the second wire.

[0009] Technical solution five is based on technical solution four: the connecting piece is connected to the corresponding tap through a terminal, and the tap is divided into two terminals, which are respectively connected to the corresponding two terminals.

[0010] Technical Solution 6 is based on Technical Solution 1: in the second winding, except for the first winding section, the remaining winding sections are all wound on the outside of the first winding section and are arranged at intervals along the axial direction of the core column where the second winding is located; the number of coil turns of the first winding section is greater than the sum of the number of coil turns of the remaining winding sections.

[0011] Technical solution seven is based on technical solution six: the number of turns of the first winding is 40 turns; the total number of turns of the second winding is 42 turns, of which the number of turns of the coil of the first winding section is 38, and the number of turns of the coil of the remaining second winding sections is 1 turn.

[0012] Technical Solution 8: It is based on Technical Solution 1: the taps are located on the same side of the second winding and are arranged at intervals along the axial direction of the core column where the second winding is located along with the winding sections.

[0013] Technical solution nine is based on technical solution eight: the first winding and the second winding are wound on the same core column from inside to outside.

[0014] Technical solution ten is based on technical solution eight: the first winding and the second winding are wound on the same core column in an up-and-down distribution manner, or are wound on two core columns respectively.

[0015] From the above description of the utility model, it can be seen that compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. In technical solution 1, a transformer with multiple voltage levels divides the second winding into a first winding section and several second winding sections, and the connection positions of each winding section are formed into taps suitable for external wiring to form multiple voltage levels. When winding the second winding section, the number of coil turns in some second winding sections is limited to 1 turn. Whether the coil is 1 turn can be determined at a glance by the winding personnel without having to determine it by counting the number of turns. This greatly reduces the risk of over-winding or under-winding, while improving the winding efficiency.

[0017] 2. In the second technical solution, the second winding of the transformer is formed by winding only one wire. At the same time, during the winding process, multiple taps are formed by extending outward and winding back in the opposite direction, and the winding of the second winding will not be interrupted. These taps can cooperate with the starting and ending ends of the wire so that the transformer can have multiple voltage levels. Moreover, since the second winding has no interrupted parts during the winding process and is a continuous winding, there is no connection between the wires, and the winding is simple. When the number of turns of the second winding section is 1 turn, the coil will not be loosely wound and easy to fall off due to the small number of turns of the coil.

[0018] 3. In technical solution three, the transformer also includes a bracket and a connector. The iron core and the terminal are fixed by the bracket and the connector, which can prevent the coil in the manufactured transformer from detaching after winding.

[0019] 4. In technical solution 4, the tap at the connection position is directly connected to the connecting piece, which is easy to install.

[0020] 5. In technical solution five, the tap at the connection position is divided into two wiring terminals, and then the two wiring terminals are respectively connected to the two wiring posts of the connector, which is convenient for external wiring and symmetrical and beautiful.

[0021] 6. In technical solution six, the remaining winding sections in the second winding except the first winding section are wound outside the first winding section, so that a larger distance can be maintained between the remaining winding sections, which is convenient for external connection of the tap.

[0022] 7. In technical solution seven, the number of coil turns of the first winding and the second winding is set, and the number of turns of each second winding segment of the second winding is limited to 1 turn. When the input voltage is 230V, multiple voltages that meet the level requirements can be output, and the number of turns of the second winding segment is 1 turn, which further reduces the risk of over-winding or under-winding and improves winding efficiency.

[0023] 8. In technical solution eight, the taps are arranged on the same side of the second winding, so that the engineers can make external connections from the same angle, which is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 The transformer structure provided in Example 1 of the utility model Figure 1 ;

[0026] Figure 2 The transformer structure provided in Example 1 of the utility model Figure 2 ;

[0027] Figure 3 A schematic diagram of a transformer winding circuit provided in Example 1 of the utility model;

[0028] Figure 4 The transformer configuration provided in Example 1 of the utility model is shown in FIG. Figure 1 ;

[0029] Figure 5 The transformer configuration provided in Example 1 of the utility model is shown in FIG. Figure 2 ;

[0030] Figure 6 This is a transformer structure diagram provided for Example 2 of the utility model.

[0031] Figure 7 The transformer structure provided in Example 2 of the utility model Figure 2 .

[0032] Description of main reference numerals:

[0033] Iron core 1; first winding 2; second winding 3; first conductor 4; second conductor 5; tap 6; bracket 7; connector 8; terminal 9. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are preferred embodiments of the utility model and should not be regarded as excluding other embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0035] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise clearly defined, the use of terms such as "first", "second" or "third" etc. is to distinguish different objects rather than to describe a specific order.

[0036] In the claims, specification and the above-mentioned drawings of the utility model, unless otherwise explicitly defined, directional words, such as the terms "center", "lateral", "longitudinal", "horizontal", "vertical", "top", "bottom", "inside", "outside", "up", "down", "front", "back", "left", "right", "clockwise", "counterclockwise", etc., indicating directions or positional relationships are based on the directions and positional relationships shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the specific protection scope of the invention.

[0037] In the claims, specification and the above drawings of the utility model, unless otherwise clearly defined, if the term "fixed connection" or "fixed connection" is used, it should be understood in a broad sense, that is, any connection method without a displacement relationship and relative rotation relationship between the two, that is to say, including non-detachable fixed connection, detachable fixed connection, integrated connection and fixed connection through other devices or elements.

[0038] In the claims, specification and drawings of the present utility model, if the terms "include", "have" and their variations are used, they are intended to mean "including but not limited to".

[0039] Example 1

[0040] Reference Figure 1 and Figure 2 An embodiment of the utility model provides a transformer, which includes a bracket 7, a plurality of connecting members 8 and a transformer assembly.

[0041] Reference Figure 3 , which shows a circuit diagram of a multi-voltage level transformer assembly provided by an embodiment of the utility model, and also refers to Figure 4 or Figure 5 , the transformer assembly includes an iron core 1, a first winding 2 and a second winding 3. The transformer assembly is used as a core component in a transformer, and is combined to form a transformer. In this embodiment, the transformer is a three-phase transformer. In other embodiments, the transformer may also be a single-phase transformer, or a three-phase to single-phase or a single-phase to three-phase transformer, which is not limited here.

[0042] in, Figure 4 and Figure 5 Two different coil winding forms are shown. Figure 4 In the embodiment, the first winding 2 and the second winding 3 are respectively wound on two core legs. Figure 5In the embodiment, the first winding 2 and the second winding 3 are wound on the same core column in an up-down distribution manner. Alternatively, as another optional implementation, the first winding 2 and the second winding 3 can also be wound on the same core column in an inside-outside manner. Figure 4 The coil winding form shown in the figure, but in other embodiments, it can also be used Figure 5 The coil winding form shown or other winding forms are not limited here.

[0043] The first winding 2 is formed by winding the first wire 4 around the iron core 1, and the second winding 3 is formed by winding the second wire 5 around the iron core 1. In addition, the second wire 5 is extended outward and reversely wound back during winding to form a plurality of taps 6 located between the starting end and the end of the second wire 5. The starting end, the end and each tap 6 of the second wire 5 are suitable for external connection. The first wire 4 and the second wire 5 are made of enameled wire.

[0044] Specifically, regardless of the winding form of each winding in the transformer assembly and the specific configuration of the iron core 1, in the transformer, the primary winding and the secondary winding have clear meanings, and the two cooperate with each other, using the principle of electromagnetic induction to change the first voltage input on one side of the primary winding into the second voltage output on one side of the secondary winding. In this embodiment, multiple taps 6 are also provided in the secondary winding, so that the secondary winding can achieve multiple gears of voltage output by changing the wiring position. Among them, the iron core 1 is made of materials such as silicon steel sheets or nickel-iron alloy sheets, which are used to provide a magnetic circuit, conduct magnetic fields and transmit electrical energy from one coil to another coil, and realize the conversion between electrical energy and magnetic energy under the action of an alternating magnetic field. The iron core usually includes an iron core column and an iron yoke. The iron core column is the part inside the iron core used to wind the primary and secondary coils of the transformer, and the coils are sleeved on these core columns. The iron yoke connects each iron core column to form a closed magnetic circuit, ensuring that the magnetic flux does not overflow to the outside of the iron core 1 and reducing leakage magnetic loss. Generally speaking, the iron core 1 can adopt a core-type structure or a shell-type structure, which is not limited here.

[0045] It should be noted that in the present invention, the first winding 2 can correspond to the primary winding of the transformer, and can also correspond to the secondary winding of the transformer. Similarly, when the first winding 2 is the primary winding of the transformer, the second winding 3 is the secondary winding of the transformer, and when the first winding 2 is the secondary winding of the transformer, the second winding 3 is the primary winding of the transformer. When the second winding 3 is the secondary winding of the transformer, the secondary winding is provided with multiple taps, and the primary winding only includes a start end and an end end. At this time, the second winding, as the output end of the transformer component, can output voltages of multiple gears; when the second winding 3 is the primary winding of the transformer, the primary winding is provided with multiple taps, and the secondary winding only includes a start end and an end end. At this time, the second winding, as the input end of the transformer component, can be connected to input voltages of multiple gears and output the same voltage. Alternatively, both the primary winding and the secondary winding are provided with multiple taps. In this case, the positions where the voltage input and the voltage output are connected can be selected according to actual needs to obtain the required number of transformation stages. The following takes the second winding 3 as the secondary winding of the transformer as an example. When the second winding 3 is the primary winding of the transformer, or when both the primary winding and the secondary winding are provided with multiple taps, the principle is the same, and those skilled in the art can obtain it without creativity based on the disclosure of this embodiment, and will not be repeated here.

[0046] Reference Figure 4 The first winding 2 includes a first conductor 4, which is wound on the first core column of the iron core 1, and the beginning and end of the first conductor 4 are led outward as the connection terminal of the first winding 2; the second winding 3 includes a second conductor 5, which is wound on the second core column of the iron core 1, and the beginning and end of the second conductor 5 are led outward, and a plurality of taps 6 leading outward are formed in the process of winding the second conductor 5, and the beginning, end and each tap 6 of the second conductor 5 form the connection terminal of the second winding 3. Among them, the tap 6 formed on the second conductor 5 is formed by extending outward and winding back in the reverse direction during the winding process of the second conductor 5. In actual operation, the second conductor 5 is firstly wound normally from top to bottom on the corresponding core column, and when the tap 6 is needed to be formed, the second conductor 5 is stretched outward and then folded back in the reverse direction to form a bent loop structure, which is the above-mentioned tap 6, and then the second conductor 5 can continue to be wound, and the second conductor 5 will not be interrupted at the position of the tap 6. Through this winding method, the second winding 3 with multiple voltage output gears can be continuously wound.

[0047] The “extending outward and winding back” mentioned above refers to the tap 6 being bent back to form a loop shape relative to the direction in which the second wire 5 extends outward, for example, Figure 2Taking the direction shown as an example, the second conductor 5 is wound in a counterclockwise direction. When it is wound to the first tap 6, the second conductor 5 is first pulled out to the right and then turned back to the left. At this time, a tap 6 is formed, and the second conductor 5 can continue to be wound to the next winding section.

[0048] In this way, the second winding 3 is formed by winding only one second wire 5. At the same time, during the winding process of the second wire 5, the second wire 5 is extended outward and wound back in the reverse direction to form a plurality of taps 6, and the winding of the second wire 5 will not be interrupted. These taps 6 can cooperate with the starting end of the second wire 5 so that the second winding 3 can have a plurality of voltage output gears. Since the second wire 5 has no interrupted parts and is a continuous second wire 5, there is no connection between the coils, the winding is simple, and the coils corresponding to each voltage output gear will not be detached.

[0049] In this embodiment, the second conductor 5 in the second winding 3 is divided into a plurality of winding sections with each tap 6 as a boundary, and except for the first winding section, the number of coil turns of the remaining winding sections is 1 turn, and except for the first winding section, the remaining winding sections are all wound outside the first winding section and arranged at intervals along the axial direction of the iron core column of the second winding 3. Among them, the number of coil turns of the first winding section is greater than the sum of the number of coil turns of the remaining winding sections.

[0050] Specifically, refer to Figure 3 In this embodiment, the number of turns of the coil of the first winding 2 is set to 40 turns, and the number of turns of the coil of the second winding 3 is set to 42 turns, wherein the number of turns of the coil of the first winding section of the second winding 3 is 38 turns, and the number of turns of the coil of the remaining winding sections is 1 turn. Therefore, in addition to the beginning and end of the second wire 5, the second wire 5 includes four taps 6. When wiring, the cable can be connected to the beginning of the second wire 5, and then the other end of the cable can be connected to each tap 6 and the end of the second wire 5 according to the required output gear. For example, when the input voltage is 230V, if the output voltage needs to be 218.5V, it is connected to the first tap 6, and if the output voltage needs to be 235.75V, it is connected to the fourth tap 6. At the same time, the number of turns of the coil of the remaining winding sections except the first winding section in the second winding 3 is set to 1 turn. Since the second wire 5 is wound continuously, when the number of turns of the coil is 1 turn, the coil will not be loosely wound and easy to fall off due to too small number of turns.

[0051] Reference Figure 1 and Figure 2 ,exist Figure 1 For the case of the main view of the transformer, Figure 2is a rear view of the transformer. In this embodiment, except for the first winding section, that is, except for the winding section of the 38-turn coil, the remaining winding sections of the 1-turn coil are wound outside the winding section of the 38-turn coil, and the two are isolated by an insulating material, which can be insulating paper or other materials. By winding the winding section of the 1-turn coil outside the winding section of the 38-turn coil, it can be avoided that the distance between the 1-turn coils is too small during winding, which is not conducive to the formation of the tap 6 and external wiring.

[0052] Reference Figure 1 The transformer also includes a bracket 7 and a plurality of connectors 8 for external wiring. The iron core 1 is fixedly mounted on the bracket 7, and a plurality of connectors 8 are also fixedly mounted on the bracket 7. The brackets 7 are connected to the beginning and end of the first wire 4, the beginning and end of the second wire 5, and a plurality of taps 6. The connectors 8 facilitate the external wiring of the first winding 2 and the second winding 3, and the taps 6 and the ends of the coils can be fixed by the connectors 8 to prevent the coils from loosening during use. The connectors 8 can be made of metal materials with good electrical conductivity and mechanical strength, such as copper or aluminum, and the surface can be tinned or galvanized to improve corrosion resistance and contact performance.

[0053] Among them, Figure 1 In the illustrated embodiment, the connector 8 is connected to the corresponding tap 6 via a terminal 9, and the terminal 9 penetrates the corresponding tap 6 along the thickness direction of the second wire 5. Specifically, the terminal 9 may be a conductive stud, and after the terminal 9 penetrates the tap 6, the terminal 9 may be fixed to the bracket 7 via a nut, and the connector 8 may also be fixed to the bracket 7, thereby completing the connection between the connector 8 and the corresponding tap 6.

[0054] In the above embodiment, the number of turns of the coils of all the second winding sections is 1 turn. In other embodiments, the number of turns of the coils of several second winding sections may not be 1 turn at the same time. For example, the number of turns of the coils of the first second winding section is 1 turn, while the number of turns of the coils of the other second winding sections is 2 turns, 3 turns or other turns, etc., which are not limited here. The specific number of turns can be set according to the actual voltage level requirements of the transformer. The design method of the number of turns of the transformer can be as follows:

[0055] S1. Obtain multiple voltage levels U of the transformer n The voltage difference between adjacent voltage levels in the circuit is used to obtain the minimum voltage difference ΔU among multiple voltage differences. min ;

[0056] S2. According to Determine the number of turns for each winding section.

[0057] According to the above, in this method, the voltage difference corresponding to the transformer coil phase difference of 1 turn is actually corresponded to the minimum voltage difference ΔUmin The number of turns required for other voltage levels can be calculated based on the voltage difference corresponding to each turn. The other parameters of the transformer can be calculated based on 4.44*Ae*Bmf=ΔU min (For ease of explanation, 4.44*Ae*Bm*f is replaced by X) calculated and determined, where Ae is the transformer core diameter (cross-sectional area), Bm is the magnetic flux density of the core, and f is the operating frequency (50HZ for an industrial frequency transformer).

[0058] Take a transformer as an example: input 230V, required output voltage 230V, accuracy ±2.5%, ±5%, the corresponding output voltage levels are as follows

[0059] P / Input voltage (V) S / Output voltage (V) Accuracy 230 218.5 -5％ 230 224.25 -2.5％ 230 230 0％ 230 235.75 2.5％ 230 241.5 5％

[0060] The voltage difference between each output voltage level is 5.75V (i.e. output 230V×2.5%)

[0061] formula In the example, let N = 1, U = 5.75, and the value of X is 5.75. According to the formula The number of coil turns of the transformer can be obtained as follows: where U is the input voltage or output voltage of different voltage levels, and N is the corresponding number of coil turns.

[0062] Input voltage Primary turns Secondary turns Theoretical output voltage (V) Output voltage and accuracy 230 40 38 218.5 Meet the requirements 230 40 39 224.25 Meet the requirements 230 40 40 230 Meet the requirements 230 40 41 235.75 Meet the requirements 230 40 42 241.5 Meet the requirements

[0063] In the above embodiment, the first winding section of the second winding is 38 turns, and each second winding section is 1 turn. If any voltage level of the above transformer is reduced, such as 235.75V is not required, then the number of turns of the corresponding second winding section (i.e., the last second winding section) is 2 turns.

[0064] Example 2

[0065] Reference Figure 6 and Figure 7 , Embodiment 2 of the utility model provides a transformer, which is different from Embodiment 1 in that, in this embodiment, when the tap 6 is connected to the connector 8, the coil at the tap 6 is first divided into two terminals, and then the two terminals are respectively connected to the corresponding two terminals 9. Specifically, the coil at the tap 6 can be cut by a shearing device so that each tap 6 forms two independent terminals, and the two terminals can be respectively connected to the two terminals 9, and the connection method can be that the terminals 9 pass through the coils at the two terminals, or the terminals can be fixed between the nuts and the corresponding gaskets by clamping.

[0066] The description of the above specification and embodiments is used to explain the protection scope of the utility model, but does not constitute a limitation on the protection scope of the utility model. Through the enlightenment of the utility model or the above embodiments, ordinary technicians in this field can obtain modifications, equivalent replacements or other improvements to the embodiments of the utility model or part of the technical features thereof through logical analysis, reasoning or limited experiments, which should be included in the protection scope of the utility model.

Claims

1. A transformer with multiple voltage levels, comprising an iron core and a first winding and a second winding wound on the iron core; wherein: The second winding includes a first winding section and several second winding sections, among which at least one has one coil turn; wherein the connection position between the first winding section and the first second winding section, and the connection position between adjacent second winding sections, all form taps, and the starting end, the end end and each tap of the second winding are suitable for forming multiple voltage levels for external wiring.

2. A multi-voltage transformer as claimed in claim 1, characterized in that: The second winding is formed by a second conductor wound around the core column of the core. Except for the last second winding section, the second conductor extends outward and winds back in the opposite direction when any winding section is wound so that the connection position of the two winding sections forms the tap.

3. A multi-voltage transformer as claimed in claim 2, characterized in that: It also includes a bracket and several connectors for external wiring; the iron core is fixedly mounted on the bracket, the connector is fixedly mounted on the bracket, and is connected to the beginning and end of the first winding, the beginning and end of the second winding, and multiple taps.

4. A multi-voltage transformer as claimed in claim 3, characterized in that: The connecting member is connected to the corresponding tap via a terminal post, and the terminal post penetrates the corresponding tap along the thickness direction of the second wire.

5. A multi-voltage transformer as claimed in claim 4, characterized in that: The connecting member is connected to the corresponding tap via a terminal, and the tap is divided into two terminals, which are respectively connected to the corresponding two terminals.

6. A multi-voltage transformer as claimed in claim 1, characterized in that: In the second winding, except for the first winding section, the remaining winding sections are all wound outside the first winding section and arranged at intervals along the axial direction of the iron core column where the second winding is located; the number of coil turns of the first winding section is greater than the sum of the number of coil turns of the remaining winding sections.

7. A multi-voltage transformer as claimed in claim 6, characterized in that: The number of turns of the first winding is 40; the total number of turns of the second winding is 42, wherein the number of turns of the coil of the first winding section is 38, and the number of turns of the coil of the remaining second winding sections is 1.

8. A multi-voltage transformer as claimed in claim 1, characterized in that: The taps are located on the same side of the second winding and are arranged with each winding section at intervals along the axial direction of the iron core column where the second winding is located.

9. A multi-voltage transformer as claimed in claim 8, characterized in that: The first winding and the second winding are wound on the same core column from inside to outside.

10. A multi-voltage transformer as claimed in claim 8, characterized in that: The first winding and the second winding are wound on the same core column in a vertically distributed manner, or are respectively wound on two core columns.

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