CN113188432B - LVDT sensor and winding method thereof - Google Patents
LVDT sensor and winding method thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of LVDT sensors, and particularly relates to an LVDT sensor and a winding method thereof, wherein the winding method comprises the steps of equally dividing a sum compensation winding into N sections; each section of boundary point of the sum value compensation winding respectively corresponds to the boundary point of each step of the first secondary winding and the second secondary winding in sequence, so that the steps of the first secondary winding and the second secondary winding are determined; and winding the sum compensation winding on the first secondary winding and the second secondary winding. The LVDT sensor is formed by winding the LVDT sensor by the winding method. The invention solves the problems that the difference ratio and the output precision of the sensor are difficult to ensure and the turn needs to be repeatedly adjusted, and improves the one-time submission qualification rate of products.
Description
Technical Field
The invention belongs to the technical field of LVDT sensors, and particularly relates to an LVDT sensor and a winding method thereof.
Background
An LVDT (linear variable differential transformer) sensor is a linear displacement sensor (hereinafter referred to as a sensor) based on the transformer principle, and comprises a primary winding and two symmetrical secondary windings, wherein an excitation voltage is given to the primary winding, the secondary windings generate output voltages of Va and Vb respectively, the Va-Vb is required to be used as the difference output of the sensor in common application fields such as steering engines, and for certain application fields such as engines, (Va-Vb)/(Va + Vb) is required to be used as the difference ratio and the output of the sensor, and the output is required to be in linear proportional relation with the displacement measured by the sensor.
The existing difference ratio and output sensor winding method firstly ensures that numerator Va-Vb output is linear through the traditional secondary winding step winding, then determines the value of denominator Va + Vb through compensation according to technical requirements, namely the difference (numerator) and the sum (denominator) are separately determined, because the Va + Vb value is greatly fluctuated (about 10 percent) in the whole sensor stroke range under the influence of the secondary winding step, the difference ratio and output linear precision of (Va-Vb)/(Va + Vb) are difficult to ensure by the method, and turns need to be repeatedly adjusted for correction after winding.
To solve this problem, the present invention employs an LVDT sensor and a winding method thereof.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
It is still another object of the present invention to provide an LVDT sensor and a winding method thereof, which solve the problems that the difference ratio and the output accuracy of the sensor are difficult to be guaranteed and the turn modulation is required repeatedly.
To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, there is provided a winding method of an LVDT sensor, including:
equally dividing the sum compensation winding into N sections;
each section of boundary point of the sum value compensation winding respectively corresponds to the boundary point of each step of the first secondary winding and the second secondary winding in sequence, so that the steps of the first secondary winding and the second secondary winding are determined;
and winding the sum compensation winding on the first secondary winding and the second secondary winding.
Preferably, the first secondary winding and the second secondary winding are connected end to end.
Preferably, the first secondary winding includes a winding 1a section and a winding 1b section, the second secondary winding includes a winding 2a section and a winding 2b section, the winding 1a section and the winding 2a section form a first step, and the winding 2b section and the winding 1b section form a second step.
Preferably, the first step and the second step are symmetrically distributed along the center of the winding length.
Preferably, dividing the sum compensation winding equally into N segments comprises: dividing the sum compensation winding into N sections according to the length L of the winding and the number N of secondary layers, wherein the length of each sectionl= L/N, wherein N =2N + 1.
Preferably, an even number of segments of the sum compensation winding are wound on the first secondary winding and the second secondary winding.
The invention also provides an LVDT sensor, which comprises a primary winding, a first secondary winding and a second secondary winding, wherein the first secondary winding and the second secondary winding are wound on the primary winding, and the LVDT sensor further comprises:
and each section of boundary point of the sum value compensation winding respectively corresponds to the boundary point of each step of the first secondary winding and the second secondary winding in sequence so as to determine the steps of the first secondary winding and the second secondary winding, and the sum value compensation winding is wound on the first secondary winding and the second secondary winding.
Preferably, the sum compensation winding is equally divided into N segments, and even-numbered segments of the sum compensation winding are wound on the first secondary winding and the second secondary winding.
Preferably, the first secondary winding includes a winding 1a section and a winding 1b section, the second secondary winding includes a winding 2a section and a winding 2b section, the winding 1a section and the winding 2a section form a first step, and the winding 2b section and the winding 1b section form a second step.
Preferably, the first step and the second step are symmetrically distributed along the center of the winding length.
The present invention includes at least the following advantageous effects
1. According to the winding method of the LVDT sensor, the sum compensation winding and the secondary winding are designed synchronously, the output sum value cannot change due to the change of the steps, and the accuracy of the sensor is improved.
2. According to the winding method of the LVDT sensor, the stepped distribution of the secondary winding is determined through the sum compensation winding, the method for determining the stepped distribution through complex calculation and repeated trial winding at present is changed, the efficiency is greatly improved, and the complexity is reduced.
3. The LVDT sensor provided by the invention has the advantages that the winding is simple and controllable, and the manual operation difficulty is reduced.
4. The LVDT sensor provided by the invention has the advantages that the difference ratio and the output precision are improved, and the qualification rate of one-time submission of products is improved.
Drawings
FIG. 1 is a schematic flow diagram of a winding method for an LVDT sensor according to the present invention;
FIG. 2 is one embodiment of a winding method for an LVDT sensor according to the present invention;
FIG. 3 is a schematic diagram of an LVDT sensor according to the present invention;
FIG. 4 is a schematic diagram of an LVDT sensor according to the present invention;
1-a first secondary winding, 2-a second secondary winding, 3-a winding 1a section, 4-a winding 1b section, 5-a winding 2a section, 6-a winding 2b section, 7-a first step, 8-a second step, 9-a sum compensation winding, 10-a primary winding, 11-a framework and 12-an iron core.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
In the present invention, the first secondary winding generates an output voltage of Va, the second secondary winding generates an output voltage of Vb, Va-Vb is output as the difference value of the sensors, and Va + Vb is output as the sum value of the sensors.
In order to monitor whether the LVDT sensor has a fault on line, the sum value is generally adopted for monitoring, the sensor Va + Vb in the whole electric stroke is a specified value, in order to meet the index, the sum value compensation winding is adopted for carrying out positive compensation (the actual value is smaller than the specified value) or negative compensation (the actual value is larger than the specified value), the compensation winding is different from the difference value compensation winding for Va-Vb, the difference value compensation winding can simultaneously change Va + Vb and Va-Vb, and the sum value compensation winding provided by the invention only changes Va + Vb and has no influence on Va-Vb.
The invention provides a winding method of an LVDT sensor, which comprises the following steps:
step 001, determining the winding length L and the number N of secondary layers according to the sensitivity requirement of the sensor, and dividing the sum compensation winding into N sections according to the winding length and the number of secondary layers, wherein the length of each section is equal to that of each secondary layerl= L/N, where N =2N +1, i.e. the length of each segment isl=L/(2n+1)；
002, sequentially corresponding each section of the dividing points of the sum compensation winding to the dividing points of each step of the first secondary winding and the second secondary winding respectively so as to determine the steps of the first secondary winding and the second secondary winding; as shown in fig. 1, the first secondary winding includes a winding 1a section and a winding 1b section, the second secondary winding includes a winding 2a section and a winding 2b section, the winding 1a section and the winding 2a section form a first step, and the winding 2b section and the winding 1b section form a second step;
each section of boundary point of the sum compensation winding respectively corresponds to the boundary points of the first ladder and the second ladder in sequence, so that the ladders of the first secondary winding and the second secondary winding are determined; for example, if the first division point L/(2n +1) corresponds to the step of the nth layer of the winding 1a segment, and the second division point 2L/(2n +1) corresponds to the step … of the 1 st layer of the winding 2b segment, the first step and the second step can be sequentially determined, so as to determine the step distribution of the first secondary winding and the second secondary winding;
specifically, the first ladder (winding 1a segment and winding 2a segment) and the second ladder (winding 1b segment and winding 2b segment) are symmetrically distributed along the center of the winding length, and after the first secondary winding and the second secondary winding are wound, even number segments of the sum compensation winding, namely 2, 4 and 6 … 2n segments, are wound on the first secondary winding and the second secondary winding.
According to the electromagnetic induction principle, the sum output of each stroke point in the effective stroke of the sensor is related to the number of turns of a winding surrounded by the sum output; in addition, the sum value of the compensation windings is equally divided according to the length of the winding and the number of secondary layers, so that the turns of the secondary windings are distributed in a step mode in the whole length of the winding (as shown in figure 4), attenuation and non-uniformity of two ends of the magnetic field intensity are compensated, and Va-Vb is linearly output; from the above, it can be found that (Va-Vb)/(Va + Vb) is also a linear output, thereby improving accuracy.
In the invention, each section of the dividing point of the sum value compensation winding respectively corresponds to the dividing point of each ladder of the first secondary winding and the second secondary winding in sequence, and the setting has the following advantages:
firstly, the sum compensation winding is only required to be wound in a gap generated by two secondary windings after the secondary windings are finished, as shown in fig. 4, the operation difficulty of workers is greatly reduced, and the consistency is improved;
second, the winding of the entire sensor is flat after winding, as shown in fig. 4, which ensures the constancy of the sensor sum and the accuracy of the output.
The invention provides an embodiment, as shown in fig. 2, taking the winding length L =150 as an example, the invention provides a winding method of an LVDT sensor, which includes the following steps:
step 001, dividing the sum value compensation winding into (2n +1) =15 sections equally according to the winding length L =150 and the number of secondary layers n =7, wherein the length of each section is L/(2n +1) = 10;
in step 002, the dividing point of each segment of the sum compensation winding corresponds to the dividing point of each step of the first secondary winding (composed of the segment of the winding 1a and the segment of the winding 1 b) and the second secondary winding (composed of the segment of the winding 2a and the segment of the winding 2 b). If the first demarcation point L/(2n +1) =10 corresponds to the step of the n =7 th layer of the winding 1a segment, and the second demarcation point 2L/(2n +1) =20 corresponds to the step … of the 1 st layer of the winding 2b segment, the step distribution of the first secondary winding and the second secondary winding is determined in turn as shown in fig. 2;
wherein, the first ladder (winding 1a section and winding 2a section) and the second ladder (winding 1b section and winding 2b section) are symmetrically distributed along the center L/2=75 of the winding length;
after the first secondary winding and the second secondary winding are wound, a sum value compensation winding is wound on the first secondary winding and the second secondary winding, wherein only even number segments, namely 2, 4 and 6 … 14 segments are wound.
The difference ratio and the output are taken as a whole, the secondary winding is determined according to the dividing point after the sum value compensation winding is divided equally, and the turns of the first secondary winding and the second secondary winding from one end to the other end are distributed in an arithmetic progression, so that the linear output of Va-Vb is ensured; after the even number section of the compensation winding is wound, the whole winding is flat, and Va + Vb is ensured to be constant. Thus ultimately ensuring that the output (Va-Vb)/(Va + Vb) is linear, i.e. synchronizing the determination of the difference (numerator) Va-Vb with the sum (denominator) Va + Vb; in addition, the steps of the secondary winding are determined according to the sum value compensation winding, the steps and the sum value compensation winding are synchronously changed, and the results prove that the influence of the steps of the secondary winding on the sum value is less than 1% according to the actual measurement result certification and the electromagnetic simulation calculation of the product applying the method, so that the difference ratio and the output precision are improved, the winding is simpler and more controllable, and the operation difficulty of workers is reduced.
Meanwhile, the invention determines the step distribution of the secondary winding through the sum value compensation winding, changes the prior method for determining the step distribution through complex calculation and repeated trial winding, greatly improves the efficiency and reduces the complexity.
After the step distribution of the secondary winding is determined by the sum value compensation winding, only even sections of the sum value compensation winding are wound on the secondary winding, because the number of turns of the product is often required to be adjusted according to a test result after the product is wound, but the secondary winding is generally in step distribution and is difficult to adjust, so the sum value compensation winding is preferentially adjusted; however, if the sum compensation winding is wound on the primary winding, when the product precision is not qualified, the secondary winding and the compensation winding need to be completely detached, which wastes time and labor; if the sum value compensation is wound on the uppermost surface, when the product precision is unqualified, only the sum value compensation winding needs to be adjusted, the operation is simple, and time and labor are saved;
in addition, only the even-numbered segments are wound to ensure that the entire winding is finally flat, and as shown in fig. 4, Va + Vb is constant at this time according to the principle of electromagnetic induction. The distribution of the secondary winding around the odd-numbered segments is not conducive to worker operation. The full-winding is an existing winding method, at the moment, a secondary winding mainly depends on a large number of trial windings, linear output of Va-Vb is guaranteed, then Va + Vb is guaranteed to be constant through a sum value compensation winding, the Va-Vb and the sum value compensation winding are separately determined, and the relevance of the patent is not achieved, namely the problem to be solved by the patent is solved.
The present invention also provides an LVDT sensor, as shown in fig. 3 and 4, including a primary winding (L1), a first secondary winding (L21) and a second secondary winding (L22), wherein the first secondary winding (L21) and the second secondary winding (L22) are wound on the primary winding (L1), the primary winding is wound on a framework 11, and an iron core 12 moves in a hollow portion of the framework 11, and further including:
and a value compensation winding (L23), each section of the value compensation winding respectively corresponds to the boundary point of each ladder of the first secondary winding (L21) and the second secondary winding (L22) in turn, so as to determine the ladder of the first secondary winding (L21) and the second secondary winding (L22), and the value compensation winding (L23) is wound on the first secondary winding (L21) and the second secondary winding (L22).
Specifically, as shown in fig. 4, the sum compensation winding is divided into N segments, and even-numbered segments of the sum compensation winding are wound around the first secondary winding and the second secondary winding;
specifically, the first secondary winding comprises a winding 1a section and a winding 1b section, the second secondary winding comprises a winding 2a section and a winding 2b section, the winding 1a section and the winding 2a section form a first step, and the winding 2b section and the winding 1b section form a second step;
and each section of boundary point of the sum compensation winding respectively corresponds to the boundary points of the first ladder and the second ladder in sequence, so that the ladders of the first secondary winding and the second secondary winding are determined.
Specifically, the first step and the second step are symmetrically distributed along the center of the winding length.
The LVDT sensor provided by the invention is formed by winding the LVDT sensor by the winding method, and the specific winding method and the principle thereof are explained in the description of the winding method, and the description is not repeated here.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following appended claims be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the invention, and that the invention be limited not by the specific details and illustrations contained herein, but rather by the general concepts defined by the claims and their equivalents.
Claims (10)
1. A method of winding an LVDT sensor, comprising:
equally dividing the sum compensation winding into N sections;
each section of boundary point of the sum value compensation winding respectively corresponds to the boundary point of each step of the first secondary winding and the second secondary winding in sequence, so that the steps of the first secondary winding and the second secondary winding are determined;
and winding the sum compensation winding on the first secondary winding and the second secondary winding.
2. The LVDT sensor winding method of claim 1 wherein the first secondary winding and the second secondary winding are end to end.
3. The winding method of an LVDT sensor in accordance with claim 2 wherein said first secondary winding includes a winding 1a segment and a winding 1b segment and said second secondary winding includes a winding 2a segment and a winding 2b segment, said winding 1a segment forming a first step with said winding 2a segment and said winding 2b segment forming a second step with said winding 1b segment.
4. The LVDT sensor winding method of claim 3 wherein the first step and the second step are symmetrically disposed along a center of a length of the winding.
5. The LVDT sensor winding method of claim 1 wherein averaging the sum compensation winding into N segments comprises: dividing the sum compensation winding into N sections according to the length L of the winding and the number N of secondary layers, wherein the length of each sectionl= L/N, wherein N =2N + 1.
6. The LVDT sensor winding method of claim 1 wherein an even number of segments of the sum compensation winding are wound on the first secondary winding and the second secondary winding.
7. An LVDT sensor including a primary winding, a first secondary winding and a second secondary winding, the first secondary winding and the second secondary winding being wound around the primary winding, further comprising:
and each section of boundary point of the sum value compensation winding respectively corresponds to the boundary point of each step of the first secondary winding and the second secondary winding in sequence so as to determine the steps of the first secondary winding and the second secondary winding, and the sum value compensation winding is wound on the first secondary winding and the second secondary winding.
8. The LVDT sensor of claim 7 wherein the sum compensation winding is divided into N segments and an even number of the segments of the sum compensation winding are wound around the first secondary winding and the second secondary winding.
9. The LVDT sensor of claim 7 wherein the first secondary winding includes a winding 1a segment and a winding 1b segment and the second secondary winding includes a winding 2a segment and a winding 2b segment, the winding 1a segment forming a first step with the winding 2a segment and the winding 2b segment forming a second step.
10. The LVDT sensor of claim 9, wherein the first step and the second step are symmetrically disposed along a center of a length of the winding.
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