Side transmission differential transformer and coil winding method

Abstract

The invention provides a side transmission differential transformer and a coil winding method, and relates to the technical field of measurement or test.The side transmission differential transformer comprises a protective shell, an end, an end cover, a winding component, an iron core, a sliding block and a sliding handle, and the end, the end cover, the winding component, the iron core, the sliding block and the sliding handle are connected with the protective shell; the winding component, the iron core and the sliding block are all located in the protective shell, the section of the iron core is trapezoidal, a trapezoidal groove is formed in the center of the surface of one side of the sliding block, the iron core is detachably connected with the trapezoidal groove, one end of the sliding handle penetrates through the sliding block and then is detachably connected with the iron core, and the protective shell is provided with a sliding channel. The sliding handle is slidably connected with the sliding channel, sliding grooves are formed in the two sides of the sliding block, sliding rails are connected into the protective shell, and the sliding grooves are slidably connected with the sliding rails. The problems that in the prior art, the structure is complex, and the occupied space is large are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of measurement or testing technology, in particular to a side transmission differential transformer and a coil winding method. BACKGROUND

[0002] The differential transformer linear displacement sensor has strong environmental adaptability, high precision and good repeatability, and is widely used in the fields of aviation, aerospace, shipbuilding, weapons, automobile electronics, etc., and is used for testing linear displacement. The sensor is used for displacement measurement by moving the core in the coil to generate a change in induced electromotive force. The working principle is shown in Figure 1 In practical applications, the winding is wound on the tubular skeleton, and the movement of the core in the tube must be connected through an axial connecting rod. The disadvantage of this method is that in order to achieve full-scale use of the sensor, the connecting rod needs sufficient axial space, which limits the application of the differential transformer linear displacement sensor in scenes with insufficient axial space. In addition, the traditional differential transformer core is usually installed in a cantilever structure, which is affected by installation and mechanical environment. During operation, the core and the inner wall of the skeleton are prone to friction, which causes the core to wear and affects the output signal.

[0003] In view of the inherent defects of the traditional differential transformer, the existing technology patent No. 202410105635.1, patent name sliding handle type linear differential transformer displacement sensor, the sensor drives the core to move inside the coil through the elastic pull rod and pulley outside the coil. However, the introduction of the pulley and elastic pull rod structure of the present application is complex, occupies a large space, and the stability and reliability of the sensor are difficult to guarantee. SUMMARY

[0004] The purpose of the present application is to provide a side transmission differential transformer which solves the problems of complex structure and large space occupation in the prior art.

[0005] The technical scheme of the present application is as follows:

[0006] The application provides a side transmission differential transformer which comprises a protective shell and a terminal, an end cover, a winding component, an iron core, a sliding block and a sliding handle which are connected with the protective shell, the terminal and the end cover are connected with two ends of the winding component respectively, the terminal and the end cover are connected with two ends of the protective shell respectively, the winding component, the iron core and the sliding block are located inside the protective shell, the cross section of the iron core is trapezoidal, a trapezoidal groove is arranged at the center position of one side surface of the sliding block, the iron core is detachably connected with the trapezoidal groove, one end of the sliding handle is detachably connected with the iron core after penetrating through the sliding block, the protective shell is provided with a sliding channel, the sliding handle is slidably connected with the sliding channel, sliding grooves are arranged at two sides of the sliding block, and slide rails are connected in the protective shell and slidably connected with the sliding grooves.

[0007] Further, the protective shell is provided with a sunken platform at two ends, and the terminal and the end cover are provided with limiting grooves connected with the sunken platform.

[0008] Further, the winding component is connected with a first working group, a second working group and a third working group in sequence, and the first working group, the second working group and the third working group are connected with end face sheets.

[0009] Further, the first working group comprises a first top layer, a first secondary coil and a first bottom layer in sequence from top to bottom,

[0010] the second working group comprises a second top layer, a primary coil and a second bottom layer in sequence from top to bottom,

[0011] and the third working group comprises a third top layer, a second secondary coil and a third bottom layer in sequence from top to bottom.

[0012] Further, the lengths of the first top layer and the first bottom layer are greater than the length of the first secondary coil,

[0013] the length of the first top layer is less than the length of the first bottom layer;

[0014] the lengths of the second top layer and the second bottom layer are greater than the length of the primary coil,

[0015] the length of the second top layer is less than the length of the second bottom layer;

[0016] the lengths of the third top layer and the third bottom layer are greater than the length of the second secondary coil,

[0017] the length of the third top layer is less than the length of the third bottom layer.

[0018] Further, the first top layer, the second top layer, and the third top layer are arranged at intervals.

[0019] The first secondary coil, the primary coil, and the second secondary coil have the same interval.

[0020] The first bottom layer, the second bottom layer, and the third bottom layer are sequentially connected.

[0021] In another aspect of the present application, a coil winding method is provided, comprising: a first secondary coil winding method, a primary coil winding method, and a second secondary coil winding method.

[0022] The first secondary coil winding method comprises the following steps:

[0023] The enameled wire is wound from the side of the first bottom layer away from the second bottom layer in a tight arrangement, and when reaching the first top layer, the enameled wire is folded back to continue tight winding, and the process is repeated until the target number of winding turns is reached, and then the winding is ended and fixed at the first bottom layer, thereby forming the first secondary coil.

[0024] The second secondary coil winding method comprises the following steps:

[0025] The enameled wire is wound from the side of the third bottom layer away from the second bottom layer in a tight arrangement, and when reaching the third top layer, the enameled wire is folded back to continue tight winding, and the process is repeated until the target number of winding turns is reached, and then the winding is ended and fixed at the third bottom layer, thereby forming the second secondary coil.

[0026] The primary coil winding method comprises the following steps:

[0027] The enameled wire is wound from the side of the second bottom layer away from the first bottom layer in a tight arrangement, and when reaching the second top layer, the enameled wire is folded back to continue tight winding, and the process is repeated until the target number of winding turns is reached, and then the winding is ended and fixed at the second bottom layer, thereby forming the primary coil.

[0028] Further, the winding direction of the primary coil is the same as that of the first secondary coil and opposite to that of the second secondary coil, and the number of winding turns of the first secondary coil is the same as that of the second secondary coil.

[0029] Further, the two ends of the primary coil are respectively provided with positive and negative input leads, and the first end of the first secondary coil and the first end of the second secondary coil are connected, and the other ends are respectively provided with positive and negative output leads.

[0030] According to the above technical features, the beneficial effects of the present application are: the side transmission differential transformer provided by the present application can save the space required for measuring the movement of the rod in the traditional differential transformer, effectively reduce the axial space required for the normal operation of the differential transformer, the transmission structure is simple to design, and can ensure the high stability and reliability of the differential transformer. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 is a schematic diagram of the principle of the present application;

[0032] Figure 2 is a schematic diagram of the structure of the present application;

[0033] Figure 3 is an exploded schematic diagram of the structure of the present application;

[0034] Figure 4 is a sectional view of the structure of the present application;

[0035] Figure 5 is Figure 4 is a sectional view of the structure of the present application;

[0036] Figure 6 is a schematic diagram of the structure of the winding component in the present application;

[0037] Figure 7 is a winding schematic diagram of the method of the present application.

[0038] In the figure: 1 - end; 2 - protective shell; 3 - winding component; 4 - core; 5 - sliding block; 6 - sliding handle; 7 - end cover; 8 - end face sheet; 9 - skeleton stack; 10 - first secondary coil; 11 - primary coil; 12 - second secondary coil. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0040] Example 1

[0041] Please refer to Figures 1-7The embodiment of the present application provides a side transmission differential transformer, which comprises a protective shell 2 and a terminal 1, an end cover 7, a winding component 3, an iron core 4, a sliding block 5 and a sliding handle 6 which are connected with the protective shell 2, the terminal 1 and the end cover 7 are connected with two ends of the winding component 3 respectively, and the terminal 1 and the end cover 7 are connected with two ends of the protective shell 2 respectively, the winding component 3, the iron core 4 and the sliding block 5 are located inside the protective shell 2, the cross section of the iron core 4 is trapezoidal, a trapezoidal groove is formed in the center position of one side surface of the sliding block 5, the iron core 4 is detachably connected with the trapezoidal groove, one end of the sliding handle 6 passes through the sliding block 5 and is detachably connected with the iron core 4, the protective shell 2 is provided with a sliding channel, the sliding handle 6 is slidably connected with the sliding channel, and sliding grooves are formed in the two sides of the sliding block 5.

[0042] It should be noted that the cross section of the sliding rail is rectangular, and the sliding block 5 and the iron core 4 are connected on the sliding rail in the protective shell 2 after being matched through the trapezoidal cross section. The matching structure of the iron core 4 and the trapezoidal groove of the sliding block 5 can ensure that the iron core 4 always keeps parallel with the upper surface of the winding during movement, thereby ensuring uniform magnetic field distribution and effectively improving measurement accuracy. By arranging the iron core 4 on one side of the winding component 3, the axial space required for the normal operation of the differential transformer can be reduced. The iron core 4 is provided with a threaded hole, one end of the sliding handle 6 is provided with a thread, one end of the sliding handle 6 passes through the sliding block 5 and is threadedly connected with the iron core 4, after the thread is locked, the sliding handle 6 can make linear motion in the sliding channel formed in the protective shell 2, and drive the sliding block 5 and the iron core 4 to move synchronously, and the sliding channel can be a waist-shaped hole. The terminal 1 and the end cover 7 are both provided with a recess and a threaded hole, after the terminal 1 and the end cover 7 are installed on the two sides of the protective shell 2, the recess can further preliminarily fix the winding component 3, and a locking screw is assembled in the threaded hole, so that the position of the winding component 3 can be finely adjusted and fixed.

[0043] Further, the protective shell 2 is provided with a sunken table at two ends, and is provided with a limiting groove connected with the sunken table. The limiting groove and the sunken table are connected to realize the connection of the terminal 1, the end cover 7 and the protective shell 2, so that the long side of the winding component 3 can be fixed, thereby ensuring that the winding component 3 remains stable during operation.

[0044] Furthermore, the winding component 3 is connected in sequence to at least a first working group, a second working group, and a third working group. The outer sides of the first working group, the second working group, and the third working group are all connected to end face plates 8, wherein the end face plates 8 are made of insulating material. The first working group, the second working group, and the third working group are the skeleton stack 9 of the winding component 3. The first working group, from top to bottom, includes a first top stack, a first primary coil 10, and a first bottom stack. The second working group, from top to bottom, includes a second top stack, a primary coil 11, and a second bottom stack. The third working group, from top to bottom, includes a third top stack, a second primary coil 12, and a third bottom stack. The first bottom stack, the second bottom stack, and the third bottom stack are connected in sequence. The first working group, the second working group, and the third working group are all made by pressing together stacked sheets in the shape of three connected long sides in an "I" shape. That is, the length of the first top stack and the first bottom stack is greater than the length of the first primary coil 10, and the length of the first top stack is less than the length of the first bottom stack; the length of the second top stack and the second bottom stack is greater than the length of the primary coil 11, and the length of the second top stack is less than the length of the second bottom stack; the length of the third top stack and the third bottom stack is greater than the length of the second primary coil 12, and the length of the third top stack is less than the length of the third bottom stack.

[0045] It should be noted that the "I"-shaped skeleton stack 9 can not only improve the mechanical strength of the skeleton, but also optimize the magnetic field distribution.

[0046] Furthermore, the outer side of the skeleton is provided with an end face plate 8 with the same shape as the stacked pieces, wherein the short sides of the three "I" shapes are of equal length, that is, the first top stack, the second top stack, and the third top stack are of the same length and are spaced apart; the spacing between the first primary coil 10, the primary coil 11, and the second primary coil 12 is the same. After pressing, the upper and lower surfaces of the stack need to be polished flat to ensure that the long and short sides of the "I" shapes are parallel to each other.

[0047] Furthermore, the slider 5 is made of a non-metallic material with self-lubricating properties; to improve the sensitivity of the entire device, the core 4 and the winding component 3 are both made of soft magnetic alloys; to improve the insulation capability of the device and ensure smooth movement of the core 4, the slider 5 is made of a non-metallic material with self-lubricating properties. The selection of these materials improves the sensor's performance. The soft magnetic alloy material has high permeability and low hysteresis loss, effectively improving the sensor's sensitivity; the non-metallic material with self-lubricating properties effectively reduces the coefficient of friction between the slider 5 and the slide rail, ensuring smooth movement of the core 4 and improving the sensor's reliability and service life.

[0048] Example 2

[0049] This invention also provides a coil winding method, including: a coil winding method for a first-stage coil 10, a coil winding method for a primary coil 11, and a coil winding method for a second-stage coil 12; wherein:

[0050] The first-stage coil 10 is wound as follows: Starting from the long side of the "I" shape on the left side of the frame, the enameled copper wire is wound in a tightly wound manner. When reaching the short side of the "I" shape, the wire is turned back and wound tightly again. This process is repeated multiple times until the target number of turns is reached. The winding ends at the long side and is then fixed to form the first-stage coil 10. In other words, the enameled wire is wound from the side of the first bottom stack away from the second bottom stack in a tightly wound manner. When reaching the first top stack, the wire is turned back and wound tightly again. This process is repeated multiple times until the target number of turns is reached. The winding ends at the first bottom stack and is then fixed to form the first-stage coil 10.

[0051] The winding method for the second-stage coil 12 is as follows: Starting from the long side of the "I" shape on the right side of the frame, the enameled copper wire is wound in a tightly wound manner. When reaching the short side of the "I" shape, the wire is turned back and wound tightly again. This process is repeated multiple times until the target number of turns is reached. The winding ends at the long side and is then fixed to form the second-stage coil 12. In other words, starting from the side of the third bottom stack away from the second bottom stack, the enameled wire is wound in a tightly wound manner. When reaching the third top stack, the wire is turned back and wound tightly again. This process is repeated multiple times until the target number of turns is reached. The winding ends at the third bottom stack and is then fixed to form the second-stage coil 12.

[0052] The winding method for the primary coil 11 is as follows: Starting from the long side of the "I" shape in the middle of the bobbin, the enameled copper wire is wound in a tightly wound manner. When reaching the short side of the "I" shape, the wire is turned back and wound tightly again. This process is repeated multiple times until the target number of turns is reached. The winding ends at the long side and is then fixed to form the primary coil 11. Alternatively, the enameled wire is wound from the side of the second bottom layer away from the first bottom layer in a tightly wound manner. When reaching the second top layer, the wire is turned back and wound tightly again. This process is repeated multiple times until the target number of turns is reached. The winding ends at the second bottom layer and is then fixed to form the primary coil 11.

[0053] It should be noted that the columnar structures at the center of the primary coil 10, primary coil 11, and secondary coil 12 used for winding are all made by pressing laminated sheets.

[0054] Furthermore, the winding direction of the primary coil 11 is the same as that of the first-stage coil 10 and opposite to that of the second-stage coil 12. The number of turns of the first-stage coil 10 and the second-stage coil 12 are the same, which can ensure that the changes in the induced voltage of the two-stage coils are symmetrical, thereby improving the linearity and stability of the output signal.

[0055] Further, input lead + and input lead - are arranged at both ends of the primary coil 11, that is, positive input lead and negative input lead are arranged at both ends of the primary coil 11; the first secondary coil 10 and the second secondary coil 12 are connected at the front ends and output lead + and output lead - are arranged at the rear ends, that is, the first secondary coil 10 and the second secondary coil 12 are connected at the front ends and positive output lead and negative output lead are arranged at the rear ends.

[0056] In detail, the winding area of the framework needs to be covered with an insulating layer.

[0057] It should be noted that the winding component 3 needs to be subjected to a varnish dipping treatment after the winding and lead arrangement are completed, so as to improve the surface insulation performance and reliability, and then assembled, the varnish dipping treatment can effectively fill the gaps between the coils, prevent the influence of the external environment on the coils, and at the same time, can enhance the overall mechanical strength of the coils and prolong the service life of the sensor.

[0058] It should be noted that the device provided by the application applies an alternating current power source to the input lead + and the input lead - when applied, the first secondary coil 10 and the second secondary coil 12 generate an induced voltage, which can be detected through the output lead + and the output lead -, when the slider 5 connected to the target to be measured is located at the midpoint of the sliding channel of the protective shell 2, the induced voltages of the two secondary coils are equal, and the output tends to be zero, when the slider 5 moves to both sides, the induced voltages of the two secondary coils increase and decrease, and the output gradually increases, through the change of the output voltage, the position information of the target to be measured can be determined.

[0059] It should be noted that the device of the application has a simple transmission structure, is easy to manufacture and assemble, and can improve the stability and reliability of the product. The differential transformer of the application has a unique winding mode, so that the working position of the iron core 4 is located on the side of the winding, the movement track of the iron core 4 is limited by the sliding rail, the wear of the iron core 4 is avoided, and the problem of wear of the iron core 4 caused by friction is eliminated. On the premise of saving axial space, the transmission structure is simple, and the differential transformer can ensure high stability and reliability.

[0060] The basic principles and main features of the application and the advantages of the application are shown and described above, and it is obvious for those skilled in the art that the application is not limited to the details of the above exemplary embodiments, and the application can be realized in other specific forms without departing from the spirit or essential characteristics of the application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the application. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A side-driven differential transformer, characterized in that, Include: The protective shell (2) and the end cap (7) are connected with the protective shell (2), the winding part (3), the core (4), the slider (5), the slide handle (6), the end cap (1) and the end cap (7) are connected with the two ends of the winding part (3) respectively, and the end cap (1) and the end cap (7) are connected with the two ends of the protective shell (2) respectively, the winding part (3), the core (4), the slider (5) are located in the protective shell (2), the cross section of the core (4) is trapezoidal, the center of the side surface of the slider (5) is provided with a trapezoidal groove, the core (4) and the trapezoidal groove are detachably connected, one end of the slide handle (6) passes through the slider (5) and is detachably connected with the core (4), the protective shell (2) is provided with a sliding channel, the slide handle (6) and the sliding channel are slidably connected, the two sides of the slider (5) are provided with sliding grooves, the protective shell (2) is connected with slide rails, and the sliding grooves and the slide rails are slidably connected.

2. The transformer of claim 1, wherein Both ends of the protective shell (2) are provided with sunken platforms, and the end cap (1) and the end cap (7) are provided with limiting grooves connected with the sunken platforms.

3. The transformer of claim 1, wherein, The winding part (3) is connected with the first working group, the second working group and the third working group in sequence.

4. The transformer of claim 3, wherein, The first working group comprises a first top layer, a first secondary coil (10) and a first bottom layer in sequence from top to bottom, The second working group comprises a second top layer, a primary coil (11) and a second bottom layer in sequence from top to bottom, The third working group comprises a third top layer, a second secondary coil (12) and a third bottom layer in sequence from top to bottom.

5. The transformer of claim 4, wherein, The length of the first top layer and the first bottom layer is greater than the length of the first secondary coil (10), The length of the first top layer is less than the length of the first bottom layer; The length of the second top layer and the second bottom layer is greater than the length of the primary coil (11), The length of the second top layer is less than the length of the second bottom layer; The length of the third top layer and the third bottom layer is greater than the length of the second secondary coil (12), The length of the third top layer is less than the length of the third bottom layer.

6. The transformer of claim 5, wherein, The first top layer, the second top layer and the third top layer are arranged with intervals; The first secondary coil (10), the primary coil (11) and the second secondary coil (12) have the same interval; The first bottom layer, the second bottom layer and the third bottom layer are connected in sequence.

7. A method of winding a coil, characterized by, Include: The application relates to a coil winding method of a first secondary coil (10), a coil winding method of a primary coil (11) and a coil winding method of a second secondary coil (12); wherein: The coil winding method of the first secondary coil (10) comprises the following steps: The enameled wire is wound in a tight arrangement from one side of the first bottom layer away from the second bottom layer to the first top layer, and then the winding is folded back and continued to be tightly wound, and the winding is repeated multiple times until the target winding turns are reached, and then the winding is ended and fixed at the first bottom layer, so that the first secondary coil (10) is prepared; The coil winding method of the second secondary coil (12) comprises the following steps: The enameled wire is wound in a tight arrangement from one side of the third bottom layer away from the second bottom layer to the third top layer, and then the winding is folded back and continued to be tightly wound, and the winding is repeated multiple times until the target winding turns are reached, and then the winding is ended and fixed at the third bottom layer, so that the second secondary coil (12) is prepared; The coil winding method of the primary coil (11) comprises the following steps: The enameled wire is wound in a tight arrangement from one side of the second bottom layer away from the first bottom layer to the second top layer, and then the winding is folded back and continued to be tightly wound, and the winding is repeated multiple times until the target winding turns are reached, and then the winding is ended and fixed at the second bottom layer, so that the primary coil (11) is prepared.

8. The coil winding method according to claim 7, characterized by, The winding direction of the primary coil (11) is the same as that of the first secondary coil (10) and opposite to that of the second secondary coil (12), and the winding turns of the first secondary coil (10) and the second secondary coil (12) are the same.

9. The coil winding method according to claim 7, characterized by, The two ends of the primary coil (11) are respectively provided with positive input lead wires and negative input lead wires; the first end of the first secondary coil (10) and the second secondary coil (12) is connected, and the tail end is respectively provided with positive output lead wires and negative output lead wires.

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