CN114267527A - Linear Variable Differential Transformer with Complementary Winding Secondary Coil - Google Patents
Linear Variable Differential Transformer with Complementary Winding Secondary Coil Download PDFInfo
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Abstract
带有互补绕组二次线圈的线性可变差动变压器，涉及传感器技术领域。本发明是为了解决具有足够锥度的线圈难以通过机器或手动制造，无法满足可变差动变压器的线性工作需求的问题。本发明所述的带有互补绕组二次线圈的线性可变差动变压器，初级线圈缠绕在线圈骨架上，第一次级线圈和第二次级线圈均缠绕在初级线圈外侧，第一次级线圈和第二次级线圈均包括N个层叠设置的线圈层，N为正整数，第一次级线圈的N个线圈层由内至外轴向长度依次增大，第二次级线圈的N个线圈层由内至外轴向长度依次减小。
A linear variable differential transformer with complementary winding secondary coils relates to the technical field of sensors. The present invention is to solve the problem that a coil with sufficient taper is difficult to manufacture by machine or manually, and cannot meet the linear working requirements of a variable differential transformer. In the linear variable differential transformer with complementary winding secondary coil according to the present invention, the primary coil is wound on the bobbin, the first secondary coil and the second secondary coil are both wound on the outside of the primary coil, and the first secondary coil is wound on the outer side of the primary coil. Both the coil and the second secondary coil include N stacked coil layers, where N is a positive integer. The N coil layers of the first secondary coil increase in axial length from the inside to the outside in turn, and the N coil layers of the second secondary coil increase in length from the inside to the outside. The axial length of each coil layer decreases sequentially from the inside to the outside.
Description
Technical Field
The invention belongs to the technical field of sensors, and particularly relates to a linear variable differential transformer.
Background
With the rapid development of national economy in China, the automation degree is continuously improved, the using amount of the sensor is increased, and the development of a displacement sensor product with high and new technology has wide prospects. The differential displacement sensor has the characteristics of high precision, good dynamic characteristic, reliable work, convenient use and the like, can be widely applied to various industries of national economy such as aerospace, machinery, construction, textile, railway, coal, metallurgy, plastics, chemical industry, scientific research colleges and the like, and is a high-technology product for measuring elongation, vibration, object thickness, expansion and the like.
A Linear Variable Differential Transformer (LVDT) is an electromechanical transducer that converts linear motion of an external object into an electrical signal proportional to the position of the object. Linear Variable Differential Transformers (LVDTs) have been used in conjunction with a wide range of measurement and control devices such as flow meters, strain gauges and pressure sensors. Important features of using a Linear Variable Differential Transformer (LVDT) include:
(1) the ability to generate a linear output signal over a relatively large range of displacement relative to the overall length of the device;
(2) durability and reliability;
(3) relatively low manufacturing costs.
In prior art Linear Variable Differential Transformer (LVDT) devices, two separate and overlapping secondary winding windings are used. The winding is conical, the number of layers of the conducting wires applied to one end of the coil is the largest, and the number of layers of the other end of the coil is gradually reduced to zero. The polarity of the coil connections is opposite and therefore the phase of the induced voltage is opposite, so that the output of the device is the difference in the induced voltages of the two secondary coils. When the ferrous coupling element is moved within the coils, the induced voltage in one coil increases while the induced voltage in the other coil decreases, thereby producing a linearly proportional variable output voltage.
Various techniques have been employed in the prior art to maximize the linear operating range of Linear Variable Differential Transformers (LVDTs), however, it is difficult to machine or manually fabricate tapered windings. The wire diameter required to produce a coil with sufficient taper is impractical and prior art devices are relatively difficult to construct and therefore relatively expensive to manufacture.
Disclosure of Invention
The invention provides a linear variable differential transformer with a complementary winding secondary coil, aiming to solve the problems that a coil with enough conicity is difficult to manufacture by a machine or a hand and cannot meet the linear working requirement of the variable differential transformer.
A linear variable differential transformer with complementary winding secondary coils, comprising: the coil comprises a coil framework G1, a primary coil C1, a first secondary coil S1 and a second secondary coil S2, wherein the primary coil C1 is wound on a coil framework G1, the first secondary coil S1 and the second secondary coil S2 are wound on the outer side of the primary coil C1, the first secondary coil S1 and the second secondary coil S2 respectively comprise N coil layers which are stacked, N is a positive integer, the axial length of the N coil layers of the first secondary coil S1 is sequentially increased from inside to outside, and the axial length of the N coil layers of the second secondary coil S2 is sequentially decreased from inside to outside.
Further, the primary coil C1 is wound by a single wire in at least two layers.
Furthermore, the wire of the primary coil C1 is wound from one end of the bobbin G1 to the other end of the bobbin G1 in the same direction to form a layer, and then the winding direction is changed and wound from the other end of the bobbin G1 to one end of the bobbin G1 to form a second layer, and so on until reaching the specified number of layers.
Further, the first secondary winding S1 and the second secondary winding S2 are each formed by winding a single wire, and each winding layer includes at least two layers of wires.
Further, the value of N is 6.
Furthermore, the lead of each first secondary coil layer is wound by one end of the primary coil C1 along the same direction for a distance to the end point of the layer to form the first layer lead of the first secondary coil layer, and then the winding direction is changed to wind the layer end point back to one end of the primary coil C1 to form the second layer lead of the first secondary coil layer, and the difference of the axial lengths of the two adjacent first secondary coil layers is the step length λ.
Furthermore, the wire of each second secondary coil layer is wound by the other end of the primary coil C1 along the same direction for a distance to the end point of the layer to form the first layer wire of the second secondary coil layer, and then the winding direction is changed to wind the layer end point back to the other end of the primary coil C1 to form the second layer wire of the second secondary coil layer, and the difference between the axial lengths of two adjacent second secondary coil layers is the step length λ.
Further, the sum of the axial lengths of the first secondary coil layer and the second secondary coil layer located at the same layer is equal to the axial length of the primary coil C1.
Further, the first secondary winding S1 and the second secondary winding S2 are connected in series with opposite phases.
The present invention overcomes the deficiencies in the prior art devices by providing two continuous and complementary secondary coils wound in a coil layer. Providing a linear output response over a relatively long core displacement range and requiring a minimum number of internal electrical connections, the present invention is easily manufactured by either mechanical or manual methods.
Meanwhile, the linear variable differential transformer with the complementary winding secondary coil is also a differential displacement sensor. The voltage amplitude is used to track the coupling element displacement, the output voltage is linearly proportional to the coupling element displacement, and the linear operating range of the Linear Variable Differential Transformer (LVDT) is maximized relative to the total length of the device.
The Linear Variable Differential Transformer (LVDT) according to the present invention has the characteristics of high reliability, simpler construction and lower manufacturing cost compared to prior art devices. The present invention provides a highly linear output signal over a long linear displacement range while being simpler and less costly to construct than currently available Linear Variable Differential Transformer (LVDT) devices.
Drawings
FIG. 1 is a schematic longitudinal cross-sectional view of a prior art tapered coil linear variable differential transformer;
FIG. 2 is an electrical schematic of a linear variable differential transformer;
fig. 3 is a longitudinal cross-sectional view of the novel stepped coil linear variable differential transformer.
The coil comprises a G1 coil skeleton, a C1 primary coil, an S1 first secondary coil, an S2 second secondary coil, an S11 first secondary coil layer, an S12 second first secondary coil layer, an S13 third first secondary coil layer, an S14 fourth first secondary coil layer, an S15 fifth first secondary coil layer, an S16 sixth first secondary coil layer, an S21 first second secondary coil layer, an S22 second secondary coil layer, an S23 third second secondary coil layer, an S24 fourth secondary coil layer, an S25 fifth second secondary coil layer and an S26 sixth secondary coil layer.
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 should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Fig. 1 is a schematic longitudinal cross-sectional view of a prior art tapered coil LVDT. The main components include an air-core bobbin G1, a primary coil C1, a first secondary coil S1, and a second secondary coil S2. The primary coil C1 is wound on the cylindrical bobbin G1, the first secondary coil S1 is wound on the primary coil C1 in a tapered shape, the number of windings at the right end of the coil is the largest, and the minimum number of wires is wound at the left end of the coil. The second secondary coil S2 is wound on the first secondary coil S1 in a complementary fashion. In fig. 2, the primary coil C1 terminates at a distance of one step of the bobbin and the secondary coils S1, S2 terminate at the ends of the bobbin. When an alternating current flows through the primary coil C1, the coupling components in different positions couple different input voltages to the secondary coils S1, S2 and can be measured at the output. The wiring and polarity of the secondary windings S1, S2 is shown in fig. 2, and the output signal produced is the difference between the induced voltages in the secondary windings S1, S2.
The amount of mutual inductance between the primary coil C1 and the secondary coils S1, S2 is a function of the physical position of the movable coupling component. As shown in fig. 1, when the movable coupling component is located near the right side of the apparatus, the coupling component is close to the thick portion of the first secondary winding S1 and is far from the thick portion of the second secondary winding S2. The voltage in the secondary windings S1, S2 is a function of the number of windings in each winding and its distance from the coupling element. Therefore, when the coupling component is close to the right side of the device, the induced voltage in the first secondary winding S1 will be higher than the induced voltage in the second secondary winding S2 because the area of the first secondary winding S1 surrounding the coupling component is thicker than the second secondary winding S2. As the coupling element moves from right to left, it gradually senses more voltage into the second secondary winding S2 and less voltage into the first secondary winding S1 due to the different thickness of each winding. At a certain point in the displacement of the coupling component within the bobbin G1, the voltages induced in the two secondary windings S1, S2 are equal in magnitude (but opposite in polarity), resulting in an output voltage of zero. This particular position is referred to as the "zero position". The zero position does not correspond to the core being at the physical center of the device because the first secondary winding S1 is closer to the coupling component than the second secondary winding S2 when the coupling component is at the center of the device. This difference in the distance of the two secondary windings S1, S2 results in more voltage being induced in the closer winding.
However, the above structure makes it difficult to manufacture the tapered winding by machine or by hand. The wire diameter required to produce a coil with sufficient taper is impractical and prior art devices are relatively difficult to construct and therefore relatively expensive to manufacture. The first embodiment is adopted below to solve the above problem.
The first embodiment is as follows: specifically, the present embodiment will be described with reference to fig. 3, and the linear variable differential transformer with complementary winding secondary coils according to the present embodiment includes: bobbin G1, primary coil C1, first secondary coil S1, and second secondary coil S2.
The primary coil C1 is wound on the bobbin G1. The primary coil C1 is wound two layers of a single wire. The specific winding mode is as follows: the lead of the primary coil C1 is wound to the other end of the coil skeleton G1 from one end of the coil skeleton G1 in the same direction to form a layer; then the winding direction is changed and the other end of the coil framework G1 is wound to one end of the coil framework G1 to form a second layer.
The first secondary coil S1 and the second secondary coil S2 are both wound outside the primary coil C1. The first secondary coil S1 and the second secondary coil S2 each include 6 coil layers arranged in a stack. The axial lengths of the 6 coil layers of the first secondary coil S1 are sequentially increased from inside to outside, and the axial lengths of the N coil layers of the second secondary coil S2 are sequentially decreased from inside to outside. The first secondary coil S1 and the second secondary coil S2 are each wound from a single wire, and each coil layer includes two layers of wires.
Specifically, the first secondary winding S1 and the second secondary winding S2 are wound in the following manner:
the first secondary coil S1 includes, in order from the inside to the outside, a first secondary coil layer S11, a second primary coil layer S12, a third primary coil layer S13, a fourth primary coil layer S14, a fifth primary coil layer S15, and a sixth primary coil layer S16.
The wire of the first secondary coil S1 is wound from one end of the primary coil C1 in the same direction for a distance to the end point of the first secondary coil layer S11, and then the winding direction is changed and wound from the end point to one end of the primary coil C1, so as to form a first secondary coil layer S11;
then changing the winding direction and winding a distance from one end of the primary coil C1 to the end point of the second layer of the first secondary coil layer S12, and then changing the winding direction and winding from the end point to one end of the primary coil C1 to form a second layer of the first secondary coil layer S12;
then changing the winding direction and winding a distance from one end of the primary coil C1 to the end point of the third primary coil layer S13, and then changing the winding direction and winding from the end point to one end of the primary coil C1 to form a third primary coil layer S13;
then changing the winding direction and winding a distance from one end of the primary coil C1 to the end point of the fourth first secondary coil layer S14, and then changing the winding direction and winding from the end point to one end of the primary coil C1 to form a fourth first secondary coil layer S14;
then changing the winding direction and winding a distance from one end of the primary coil C1 to the end point of the fifth-layer first secondary coil layer S15, and then changing the winding direction and winding from the end point to one end of the primary coil C1 to form a fifth-layer first secondary coil layer S15;
then the winding direction is changed and wound from one end of the primary coil C1 to an end point of the sixth layer first secondary coil layer S16, and then the winding direction is changed and wound from the end point to one end of the primary coil C1, constituting a sixth layer first secondary coil layer S16.
The second secondary coil S2 includes, in order from the inside to the outside, a first second secondary coil layer S21, a second secondary coil layer S22, a third second secondary coil layer S23, a fourth second secondary coil layer S24, a fifth second secondary coil layer S25, and a sixth second secondary coil layer S26.
The wire of the second secondary coil S2 is wound from the other end of the primary coil C1 in the same direction for a distance to the end point of the first layer of the second secondary coil layer S21, and then the winding direction is changed and the wire is wound from the end point to the other end of the primary coil C1 to form a first layer of the second secondary coil layer S21;
then the winding direction is changed to wind a distance from the other end of the primary coil C1 to the end point of the second secondary coil layer S22, and then the winding direction is changed to wind the other end of the primary coil C1 from the end point to form a second secondary coil layer S22;
then the winding direction is changed to wind a distance from the other end of the primary coil C1 to the end point of the third secondary coil layer S23, and then the winding direction is changed to wind the other end of the primary coil C1 from the end point to form a third secondary coil layer S23;
then the winding direction is changed to wind a distance from the other end of the primary coil C1 to the end point of the fourth layer of the second secondary coil layer S24, and then the winding direction is changed to wind the other end of the primary coil C1 from the end point to form a fourth layer of the second secondary coil layer S24;
then the winding direction is changed to wind a distance from the other end of the primary coil C1 to the end point of the fifth-layer second secondary coil layer S25, and then the winding direction is changed to wind the other end of the primary coil C1 from the end point to form a fifth-layer second secondary coil layer S25;
then, the winding direction is changed from the other end of the primary coil C1 to the end point of the sixth second secondary coil layer S26, and then the winding direction is changed from the end point to the other end of the primary coil C1, thereby forming a sixth second secondary coil layer S26.
The difference of the axial lengths of the two adjacent first secondary coil layers is the step length lambda. The difference of the axial lengths of the two adjacent second secondary coil layers is the step length lambda. The sum of the axial lengths of the first secondary coil layer and the second secondary coil layer located at the same layer is equal to the axial length of the primary coil C1.
The first secondary winding S1 and the second secondary winding S2 are connected in series with opposite phases. A center point electrical connection is also provided between the two coils so that the voltage of each secondary coil can be measured independently. In this way, the sum and difference of the two secondary voltages can be measured independently and simultaneously using external electronics.
The working principle of the embodiment is as follows: in fig. 3, the movable coupling element is located near the right edge of the bobbin G1. The movable coupling component can move transversely to generate parameters. In the case where the coupling element is located at a different position, the magnetic flux induces different voltages in the first secondary winding S1 and the second secondary winding S2. The magnitude of the voltages induced in the first secondary winding S1 and the second secondary winding S2 is a function of the magnetic flux of the magnetic field through the windings. The magnitude of the magnetic flux through each secondary coil is a function of the input voltage to the primary coil and the position of the movable core relative to the secondary coil.
The movable coupling component is surrounded by the six coil layers of the second secondary coil S2, and is also surrounded by the six coil layers of the first secondary coil S1. Therefore, when the magnetic field around the coupling component induces a higher voltage in the second secondary winding S2 than in the first secondary winding S1, because the second secondary winding S2 has more windings to intercept the magnetic field around the coupling component. The magnetic field around the coupling element intercepts more of the magnetic field of the first secondary coil S1 than the magnetic field of the second secondary coil S2. Therefore, as the coupling element moves from right to left, the voltage generated in the first secondary winding S1 increases, and the voltage generated in the second secondary winding S2 decreases. By measuring and comparing the two voltages, the position of the coupling component can be accurately determined. The positions of the coupling components can be associated with parameters to be measured, so that the measurement of different parameters is realized.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.
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Citations (6)
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| US7317371B1 (en) * | 2007-02-21 | 2008-01-08 | Pearl Process Systems, Llc | Linear variable differential transformer with complimentary step-winding secondary coils |
| US20170352464A1 (en) * | 2016-06-01 | 2017-12-07 | Honeywell International Inc. | Linear variable displacement transformer (lvdt) with improved linearity using extreme end booster winding |
| CN108286932A (en) * | 2018-02-28 | 2018-07-17 | 陕西驰诺电子科技有限公司 | A kind of high-precision two-part differential transformer displacement sensor |
| CN110440835A (en) * | 2019-08-15 | 2019-11-12 | 厦门乃尔电子有限公司 | A kind of LVDT linear precision compensation technique |
| CN110736429A (en) * | 2018-07-19 | 2020-01-31 | 科峰航智电气科技（天津）有限公司 | A Winding Structure for Improving LVDT Linearity |
| CN113188432A (en) * | 2021-06-25 | 2021-07-30 | 西安联飞智能装备研究院有限责任公司 | LVDT sensor and winding method thereof |
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2021
- 2021-12-31 CN CN202111675495.4A patent/CN114267527A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7317371B1 (en) * | 2007-02-21 | 2008-01-08 | Pearl Process Systems, Llc | Linear variable differential transformer with complimentary step-winding secondary coils |
| US20170352464A1 (en) * | 2016-06-01 | 2017-12-07 | Honeywell International Inc. | Linear variable displacement transformer (lvdt) with improved linearity using extreme end booster winding |
| CN108286932A (en) * | 2018-02-28 | 2018-07-17 | 陕西驰诺电子科技有限公司 | A kind of high-precision two-part differential transformer displacement sensor |
| CN110736429A (en) * | 2018-07-19 | 2020-01-31 | 科峰航智电气科技（天津）有限公司 | A Winding Structure for Improving LVDT Linearity |
| CN110440835A (en) * | 2019-08-15 | 2019-11-12 | 厦门乃尔电子有限公司 | A kind of LVDT linear precision compensation technique |
| CN113188432A (en) * | 2021-06-25 | 2021-07-30 | 西安联飞智能装备研究院有限责任公司 | LVDT sensor and winding method thereof |
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Application publication date: 20220401 |