阅读说明：本技术 高灵敏度lvdt的计算方法及高灵敏度lvdt设计绕线的工艺 (Calculation method of high-sensitivity LVDT and winding design process of high-sensitivity LVDT ) 是由 周胜仁 孔致鹏 陈玉财 林坤艺 翁新全 许静玲 刘瑞林 柯银鸿 于 2020-04-28 设计创作，主要内容包括：本发明公开了一种高灵敏度LVDT的计算方法及高灵敏度LVDT设计绕线的工艺,将次级线圈1-2和次级线圈2-2分别相对次级线圈1-1和次级线圈2-1反向绕制,然后根据公式<Image he="150" wi="331" file="DDA0002471529300000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>计算次级线圈1-1、次级线圈1-2、次级线圈2-1和次级线圈2-2的具体层数,再根据每层匝数计算公式,设计出每层的具体匝数。本发明可满足小行程高灵敏度要求。(The invention discloses a calculation method of a high-sensitivity LVDT and a winding design process of the high-sensitivity LVDT, wherein a secondary coil 1-2 and a secondary coil 2-2 are respectively reversely wound relative to the secondary coil 1-1 and the secondary coil 2-1 and then are wound according to a formula And calculating the specific number of layers of the secondary coil 1-1, the secondary coil 1-2, the secondary coil 2-1 and the secondary coil 2-2, and designing the specific number of turns of each layer according to a calculation formula of the number of turns of each layer. The invention can meet the requirements of small stroke and high sensitivity.)

1. A method for calculating a high-sensitivity LVDT, comprising: setting the length of an iron core as L, setting the walking displacement as that secondary coils 1-1 and 2-1 are bilaterally symmetrical and are both in b-layer horizontal winding, secondary coils 1-2 and 2-2 are bilaterally symmetrical and are both in c-layer horizontal winding, and winding the secondary coils 1-2 and 2-2 in the same direction relative to the secondary coils 1-1 and 2-1 respectively according to the following formula:

obtaining an absolute value of sensitivity | w | > max not to exceed

By the above calculation formula (1), it can be found that the maximum sensitivity that can be achieved by the current level-winding scheme is

2. A method for calculating a high-sensitivity LVDT, comprising: setting the length of an iron core as L, setting the traveling displacement as that the secondary coils 1-1 and 2-1 are bilaterally symmetrical and have the layer number of b, the secondary coils 1-2 and 2-2 are bilaterally symmetrical and have the layer number of c, wherein b is more than c, and the secondary coils 1-2 and 2-2 are respectively reversely wound relative to the secondary coils 1-1 and 2-1 according to the following formula:

the absolute value | w | for obtaining the sensitivity of the new level wind method is larger thanAny value of (a);

by the above calculation formula (2), it can be obtained that the maximum sensitivity that can be achieved by the new level winding scheme is greater thanAny number of (a).

3. A winding design process of a high-sensitivity LVDT is characterized by comprising the following steps:

the method comprises the following steps: setting the length of the iron core as L, and setting the walking displacement as that the secondary coils 1-1 and 2-1 are bilaterally symmetrical and are both in b-layer horizontal winding, and the secondary coils 1-2 and 2-2 are bilaterally symmetrical and are both in c-layer horizontal winding;

step two: and (3) winding the secondary coil 1-2 and the secondary coil 2-2 oppositely to the secondary coil 1-1 and the secondary coil 2-1 respectively, wherein b is larger than c, and establishing a calculation formula of the sensitivity w:

deriving absolute values of sensitivity

Step three: setting the length of iron core as L ═ L₀，w＝w₀Displacement of movement of the core₀And if the effective winding length of the whole framework is S, the relation between b and c can be obtained according to the formula (2), namely the layer ratio of the secondary coil 1-1 or the secondary coil 2-1 to the secondary coil 1-2 or the secondary coil 2-2 is obtained, and the result is as follows:

when the product only specifies the excitation voltage and does not specify the output voltage and the shape limit size, c can be any positive number larger than 0, so that the value b is determined;

step four: the total number of turns of the secondary coil 1-2 and the secondary coil 2-2 are set to bed is the diameter of the enameled wire, and the number of layers is calculated as follows:

c is a positive number, and any c may be represented by c ═ n + k, n is an integer of 0 or more, and k is a decimal of 0 or more and less than 1;

the number of layers of the secondary coil 1-2 and the secondary coil 2-2 is n +1 layers, and the number of turns of each layer of the former n layers isThe n +1 th layer has the number of turns of

Step five: when c ═ c₀Then, thenThe total number of turns of the secondary coil 1-1 and the secondary coil 2-1 are allSimilarly, b may be represented by b ═ m + t, m is an integer of 0 or more, and t is a decimal of 0 or more and less than 1;

the number of layers of the secondary coil 1-1 and the secondary coil 2-1 is m +1 layers, and the number of turns of each layer of the former m layers isThe m +1 th layer has the turns of

Through the steps, the LVDT meeting the requirements of small stroke and high sensitivity is designed.

4. A process for designing winding of a high-sensitivity LVDT comprises the following steps:

the method comprises the following steps: setting the length of an iron core as L, and setting the traveling displacement as b layers of bilaterally symmetrical secondary coils 1-1 and 2-1 and c layers of bilaterally symmetrical secondary coils 1-2 and 2-2;

step two: when the secondary coil 1-2 and the secondary coil 2-2 are wound in the same direction relative to the secondary coil 1-1 and the secondary coil 2-1 respectively, a calculation formula of the sensitivity w is established:

according to the formula, the maximum sensitivity which can be designed by the current flat winding mode does not exceed

Step three: when the secondary coil 1-2 and the secondary coil 2-2 are oppositely wound relative to the secondary coil 1-1 and the secondary coil 2-1 respectively, and b is larger than c, a calculation formula of the sensitivity w is established:

deriving absolute sensitivityTo the valueTherefore, the new level winding method can be designed to be more than anyA high sensitivity scheme of (2);

step four: setting the length of iron core as L ═ L₀，w＝w₀Displacement of movement of the core₀And if the effective winding length of the whole framework is S, the relation between b and c can be obtained according to the formula (2), namely the layer ratio of the secondary coil 1-1 or the secondary coil 2-1 to the secondary coil 1-2 or the secondary coil 2-2 is obtained, and the result is as follows:

when the product only specifies the excitation voltage and does not specify the output voltage and the shape limit size, c can be any positive number larger than 0, so that the value b is determined;

step five: the total number of turns of the secondary coil 1-2 and the secondary coil 2-2 are set to bed is the diameter of the enameled wire, and the number of layers is calculated as follows:

c is a positive number, and any c may be represented by c ═ n + k, n is an integer of 0 or more, and k is a decimal of 0 or more and less than 1;

the number of layers of the secondary coil 1-2 and the secondary coil 2-2 is n +1 layers, and the number of turns of each layer of the former n layers isThe n +1 th layer has the number of turns of

Step six: when c ═ c₀Then, thenThe total number of turns of the secondary coil 1-1 and the secondary coil 2-1 are allSimilarly, b may be represented by b ═ m + t, m is an integer of 0 or more, and t is a decimal of 0 or more and less than 1.

The number of layers of the secondary coil 1-1 and the secondary coil 2-1 is m +1 layers, and the number of turns of each layer of the former m layers isThe m +1 th layer has the turns of

Technical Field

The invention relates to the technical field of sensors, in particular to a calculation method of a high-sensitivity LVDT and a winding design process of the high-sensitivity LVDT.

Background

At present, the domestic miniature LVDT is required to output specific sensitivity and possess specific input impedance within a very small stroke range. The miniature LVDT is small in size and small in required electrical stroke, and the design of the specific sensitivity of the miniature LVDT is generally realized by adopting a secondary coil flat winding mode in China. And the secondary 1-1 and the secondary 1-2 of the secondary coil are wound in the same direction, and the secondary 2-1 and the secondary 2-2 are also wound in the same direction.

Although the current winding mode can solve the requirement of realizing small sensitivity of the miniature LVDT in a small stroke range. But cannot meet the requirement of realizing high sensitivity with small stroke. For example, when the LVDT with the total product length of 11mm adopts the current flat winding mode, the sensitivity of the product at the stroke of +0.8mm cannot be designed to be 0.3. Therefore, there is a need to improve the level winding scheme on the basis of the prior art so that it can achieve the requirements of small stroke and high sensitivity.

Disclosure of Invention

One of the objects of the present invention is to provide a method for calculating sensitivity of the conventional level-winding method, which realizes the design of specific sensitivity.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

a high-sensitivity LVDT calculation method is characterized in that the length of an iron core is set to be L, the walking displacement is set to be that secondary coils 1-1 and 2-1 are bilaterally symmetrical and are both in b-layer flat winding, secondary coils 1-2 and 2-2 are bilaterally symmetrical and are both in c-layer flat winding, the secondary coils 1-2 and the secondary coils 2-2 are wound in the same direction relative to the secondary coils 1-1 and the secondary coils 2-1 respectively, and the method is based on the following formula:

obtaining an absolute value of sensitivity | w | > max not to exceed

Through the calculation formula, the maximum sensitivity which can be realized by the current domestic level winding scheme can be obtained as

The invention mainly aims to overcome the defects of the prior art and provide a calculation method of a high-sensitivity LVDT capable of meeting the requirements of small stroke and high sensitivity and a winding design process.

In order to achieve the above purpose, the solution of the invention is:

a high-sensitivity LVDT calculation method is characterized in that the length of an iron core is set to be L, the traveling displacement is set to be that secondary coils 1-1 and 2-1 are bilaterally symmetrical and have the number of layers of b, secondary coils 1-2 and 2-2 are bilaterally symmetrical and have the number of layers of c, b is larger than c, the secondary coils 1-2 and the secondary coils 2-2 are respectively reversely wound relative to the secondary coils 1-1 and the secondary coils 2-1, and the following formula is adopted:

an absolute value | w | of sensitivity obtained in the level wind mode is larger thanAny value of (c).

After the method is adopted, the new flat winding mode can be designed to be larger than any value according to a formulaThe high-sensitivity scheme can be designed, because the sensitivity w of the maximum stroke, the length L of the iron core and the movement displacement of the iron core are determined, the specific layers of the secondary coil 1-1, the secondary coil 2-1, the secondary coil 1-2 and the secondary coil 2-2 can be obtained according to the formula, and the requirements of small stroke and high sensitivity can be metAnd (4) requiring.

Another object of the present invention is to provide a process for designing windings of LVDT with high sensitivity that can meet the requirements of small stroke and high sensitivity.

In order to achieve the above purpose, the solution of the invention is:

a process for designing winding of a high-sensitivity LVDT comprises the following steps:

the method comprises the following steps: setting the length of the iron core as L, and setting the walking displacement as that the secondary coils 1-1 and 2-1 are bilaterally symmetrical and are both in b-layer horizontal winding, and the secondary coils 1-2 and 2-2 are bilaterally symmetrical and are both in c-layer horizontal winding;

step two: and (3) winding the secondary coil 1-2 and the secondary coil 2-2 oppositely to the secondary coil 1-1 and the secondary coil 2-1 respectively, wherein b is larger than c, and establishing a calculation formula of the sensitivity w:

deriving absolute values of sensitivity

Step three: setting the length of iron core as L ═ L₀，w＝w₀Displacement of movement of the core₀And if the effective winding length of the whole framework is S, the relation between b and c can be obtained according to the formula (2), namely the layer ratio of the secondary coil 1-1 or the secondary coil 2-1 to the secondary coil 1-2 or the secondary coil 2-2 is obtained, and the result is as follows:

when the product only specifies the excitation voltage and does not specify the output voltage and the shape limit size, c can be any positive number larger than 0, so that the value b is determined;

step four: the total number of turns of the secondary coil 1-2 and the secondary coil 2-2 are set to bed is the diameter of the enameled wire, and the number of layers is calculated as follows:

c is a positive number, and any c may be represented by c ═ n + k, n is an integer of 0 or more, and k is a decimal of 0 or more and less than 1;

the number of layers of the secondary coil 1-2 and the secondary coil 2-2 is n +1 layers, and the number of turns of each layer of the former n layers isThe n +1 th layer has the number of turns of

Step five: when c ═ c₀Then, thenThe total number of turns of the secondary coil 1-1 and the secondary coil 2-1 are allSimilarly, b may be represented by b ═ m + t, m is an integer of 0 or more, and t is a decimal of 0 or more and less than 1.

The number of layers of the secondary coil 1-1 and the secondary coil 2-1 is m +1 layers, and the number of turns of each layer of the former m layers isThe m +1 th layer has the turns of

Through the steps, the LVDT which meets the requirements of small stroke and high sensitivity can be designed.

It is still another object of the present invention to provide a process for designing LVDT routing with any sensitivity requirement.

In order to achieve the purpose, the invention adopts the technical scheme that:

a process for designing winding of a high-sensitivity LVDT comprises the following steps:

the method comprises the following steps: setting the length of an iron core as L, and setting the traveling displacement as b layers of bilaterally symmetrical secondary coils 1-1 and 2-1 and c layers of bilaterally symmetrical secondary coils 1-2 and 2-2;

step two: when the secondary coil 1-2 and the secondary coil 2-2 are wound in the same direction relative to the secondary coil 1-1 and the secondary coil 2-1 respectively, a calculation formula of the sensitivity w is established:

according to the formula, the maximum sensitivity which can be designed by the current flat winding mode does not exceed

Step three: when the secondary coil 1-2 and the secondary coil 2-2 are oppositely wound relative to the secondary coil 1-1 and the secondary coil 2-1 respectively, and b is larger than c, a calculation formula of the sensitivity w is established:

deriving absolute values of sensitivityTherefore, the new level winding method can be designed to be more than anyA high sensitivity scheme of (2);

step four: setting the length of iron core as L ═ L₀，w＝w₀Displacement of movement of the core₀And if the effective winding length of the whole framework is S, the relation between b and c can be obtained according to the formula (2), namely the layer ratio of the secondary coil 1-1 or the secondary coil 2-1 to the secondary coil 1-2 or the secondary coil 2-2 is obtained, and the result is as follows:

when the product only specifies the excitation voltage and does not specify the output voltage and the shape limit size, c can be any positive number larger than 0, so that the value b is determined;

step five: the total number of turns of the secondary coil 1-2 and the secondary coil 2-2 are set to bed is the diameter of the enameled wire, and the number of layers is calculated as follows:

c is a positive number, and any c may be represented by c ═ n + k, n is an integer of 0 or more, and k is a decimal of 0 or more and less than 1;

the number of layers of the secondary coil 1-2 and the secondary coil 2-2 is n +1 layers, and the number of turns of each layer of the former n layers isThe n +1 th layer has the number of turns of

Step six: when c ═ c₀Then, thenThe total number of turns of the secondary coil 1-1 and the secondary coil 2-1 are allSimilarly, b may be represented by b ═ m + t, m is an integer of 0 or more, and t is a decimal of 0 or more and less than 1.

The number of layers of the secondary coil 1-1 and the secondary coil 2-1 is m +1 layers, and the number of turns of each layer of the former m layers isThe m +1 th layer has the turns of

The LVDT with any sensitivity requirement can be designed by adopting the steps from one to six.

Drawings

Fig. 1 is a schematic winding diagram of a conventional coil in a flat winding manner.

Fig. 2 is a schematic winding diagram of the coil flat winding of the present invention.

Detailed Description

In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.

The design concept of the invention is as follows: the sensitivity theoretical calculation formula of the existing level winding scheme is established according to the domestic current level winding scheme: assume that secondary coils 1-1 and 2-1 are b-layer level wound (as shown in fig. 1); the secondary coils 1-2 and 2-2 are c-layer level wound, and the winding directions of the secondary coils 1-2 and 2-2 are respectively in the same direction as those of the secondary coils 1-1 and 2-1. Deducing the relationship between the sensitivity w of the sensor and the secondary 1-1 or 2-1 layer number b, the secondary 1-2 or 2-1 layer number c, the displacement and the iron core length L: w is 2 x (b-c)/L/(b + c). As can be seen from the current formula, the maximum sensitivity that can be realized by the current domestic level winding scheme is theoretically onlyIf the winding directions of the secondary 1-2 and 2-2 are both reversed from the secondary 1-1 and 2-1, respectively, the sensitivity of the new design is: w is 2 x (b + c)/L/(b-c). According to the formula, the maximum sensitivity w of the new flat winding mode can be larger thanAny value of (c). During design, the sensitivity w of the maximum stroke, the length L of the iron core and the movement displacement of the iron core are determined, so that the specific layers of the secondary 1-1, the secondary 2-1, the secondary 1-2 and the secondary 2-2 can be obtained according to a formula. And calculating the specific number of turns of each layer according to a calculation formula of the number of turns of each layer.

If an LVDT is designed to meet all sensitivity requirements, the following scheme can be adopted:

a process for designing winding of a high-sensitivity LVDT comprises the following steps:

the method comprises the following steps: setting the length of an iron core as L, and setting the traveling displacement as b layers of bilaterally symmetrical secondary coils 1-1 and 2-1 and c layers of bilaterally symmetrical secondary coils 1-2 and 2-2;

step two: when the secondary coil 1-2 and the secondary coil 2-2 are wound in the same direction relative to the secondary coil 1-1 and the secondary coil 2-1 respectively, a calculation formula of the sensitivity w is established:

according to the formula, the maximum sensitivity which can be designed by the current flat winding mode does not exceed

Step three: when the secondary coil 1-2 and the secondary coil 2-2 are oppositely wound relative to the secondary coil 1-1 and the secondary coil 2-1 respectively, and b is larger than c, a calculation formula of the sensitivity w is established:

deriving absolute values of sensitivityTherefore, the new level winding method can be designed to be more than anyA high sensitivity scheme of (2);

step four: setting the length of iron core as L ═ L₀，w＝w₀Displacement of movement of the core₀And if the effective winding length of the whole framework is S, the relation between b and c can be obtained according to the formula (2), namely the layer ratio of the secondary coil 1-1 or the secondary coil 2-1 to the secondary coil 1-2 or the secondary coil 2-2 is obtained, and the result is as follows:

when the product only specifies the excitation voltage and does not specify the output voltage and the shape limit size, c can be any positive number larger than 0, so that the value b is determined;

step five: the total number of turns of the secondary coil 1-2 and the secondary coil 2-2 are set to bed is the diameter of the enameled wire, and the number of layers is calculated as follows:

c is a positive number, and any c may be represented by c ═ n + k, n is an integer of 0 or more, and k is a decimal of 0 or more and less than 1;

the number of layers of the secondary coil 1-2 and the secondary coil 2-2 is n +1 layers, and the number of turns of each layer of the former n layers isThe n +1 th layer has the number of turns of

Step six: when c ═ c₀Then, thenThe total number of turns of the secondary coil 1-1 and the secondary coil 2-1 are allSimilarly, b may be represented by b ═ m + t, m is an integer of 0 or more, and t is a decimal of 0 or more and less than 1.

The number of layers of the secondary coil 1-1 and the secondary coil 2-1 is m +1 layers, and the number of turns of each layer of the former m layers isThe m +1 th layer has the turns of

According to the above process, as shown in fig. 2, it is one of the specific embodiments of the present invention:

assuming that the core length L is 8mm, the bobbin effective winding length S is 11mm, the displacement of the core movement is 0.8mm, and the sensitivity w when the core moves 0.8mm is 0.3. The wire diameter of the enameled wire of the primary coil and the secondary coil of the product is 0.098mm (containing an insulating sheath). When the number of primary coil layers a is 6 and the number of turns is 673, the winding mode of the secondary coil is designed and calculated as follows:

b is 5c (the value of c can be any positive number) according to the formula (2).

Suppose that when c takes 1.5, then b takes 7.5. The secondary coil 1-2 and the secondary coil 2-2 are tightly wound for 1 layer at a gap of 0.098mm, and the number of turns is 56; and then, the coil is thinly wound by one layer, and the number of turns is 28. Similarly, the secondary coil 1-1 and the secondary coil 2-1 are densely wound for 7 layers at a gap of 0.098mm, and the number of turns of each layer is 56; and then, the coil is thinly wound by one layer, and the number of turns is 28.

The above embodiments and drawings do not limit the product form and style of the present invention, and the calculation formula and the winding process derived from the formula are all within the protection scope of the present invention, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present invention.