A dual-channel linear displacement sensor

Abstract

This invention discloses a dual-channel linear displacement sensor, comprising: a fine channel primary component, a coarse channel primary component, and a secondary iron core disposed between the two. Multiple secondary small teeth and an arc-shaped protrusion are respectively provided on both sides of the secondary iron core, representing the multi-pole and single-pole pairs of the linear displacement sensor, respectively. Therefore, this linear displacement sensor combines a multi-pole linear displacement sensor and a single-pole linear displacement sensor, and the coarse and fine channels share a single secondary iron core. This results in a simpler structure, reduced electromagnetic interference, high detection accuracy, and the ability to obtain absolute linear position. Furthermore, it exhibits strong environmental adaptability, a simple structure, and a lower price.

Description

Technical Field

[0001] This invention relates to the field of length detection structure technology, and more specifically to a dual-channel linear displacement sensor. Background Technology

[0002] The main sensing elements for linear detection include optical grating rulers, magnetic grating rulers, and some capacitive and inductive sensors. Optical grating rulers are widely used in length displacement detection due to their advantages. However, the principle and structural characteristics of optical grating rulers determine that they have high requirements for the operating environment. For example, dust, oil stains, and strong impacts and vibrations may reduce their accuracy or damage them. At the same time, their structure is relatively complex and their cost is relatively high.

[0003] In high-precision angle detection systems, a dual-channel approach is often used. This means that a low-precision angle measuring element is responsible for measuring angles over a large range (coarse measurement), while a high-precision device is used to achieve precise measurements over a small range (fine measurement). However, existing technologies, such as Chinese Patent Announcement No. CN205102766, entitled "A Novel Non-Contact Linear Displacement Sensor," are single-channel detection sensors and cannot meet the requirements of dual-channel detection.

[0004] Therefore, how to provide a dual-channel linear displacement sensor that can reduce electromagnetic interference, provide high detection accuracy, obtain absolute linear position, and has strong environmental adaptability, simple structure, and low price is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a dual-channel linear displacement sensor that can reduce electromagnetic interference, provide high detection accuracy, obtain absolute linear position, and has strong environmental adaptability, simple structure, and low price.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A dual-channel linear displacement sensor, comprising:

[0008] A primary channel assembly includes a first primary core and a first winding. A plurality of first toothed posts are arranged at equal intervals on one side of the first primary core. Each first toothed post has a plurality of primary small teeth at its end away from the first primary core. The first winding is wound on the first toothed post through a first insulating member.

[0009] A coarse-channel primary assembly, comprising: a second primary iron core and a second winding, wherein a plurality of second toothed posts are arranged at equal intervals on one side of the second primary iron core, and the second winding is wound on the second toothed posts through a second insulating member;

[0010] The secondary component is a secondary iron core, which is placed between the first primary iron core and the second primary iron core. Multiple secondary small teeth are evenly spaced on the side of the secondary iron core opposite to the primary small teeth. The number of secondary small teeth corresponds to the fine channel pole pairs of the linear displacement sensor. A first air gap is formed between the secondary small teeth and the primary small teeth. The other side of the secondary iron core opposite to the second primary iron core has an arc-shaped protrusion structure, which corresponds to the coarse channel pole pairs of the linear displacement sensor. A second air gap is formed between the arc-shaped protrusion structure and the second tooth post.

[0011] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a dual-channel linear displacement sensor. This linear displacement sensor combines a multi-pole linear displacement sensor and a single-pole linear displacement sensor together, and the coarse channel and the fine channel share a secondary iron core. The structure is simpler, reduces electromagnetic interference, provides high detection accuracy, and can also obtain absolute linear position. At the same time, it has strong environmental adaptability, simple structure, and low price.

[0012] Furthermore, the secondary iron core is provided with elongated air gap holes, which can reduce the mutual interference between the coarse channel and the fine channel and improve the detection accuracy of the linear displacement sensor.

[0013] Furthermore, the two end faces of the first primary iron core are arc-shaped structures; the top of the two sides of the second primary iron core have edge teeth, the width of which is equal to or half the width of the second tooth post, and the edge teeth are connected to the end of the second primary iron core by an arc or oblique line transition. The arc-shaped structure and the arc or oblique line transition can reduce the influence of the longitudinal end edge effect of the first primary iron core and the second primary iron core, respectively.

[0014] Furthermore, the first primary iron core has a first mounting groove at both ends, and the second primary iron core has a second mounting groove at both ends.

[0015] Furthermore, the secondary iron core is provided with mounting holes.

[0016] Furthermore, both the first insulating element and the second insulating element are insulating frames or kits made of insulating materials.

[0017] Furthermore, the second air gap is the minimum gap between the arc-shaped protrusion structure and the second tooth column, and the width range of the second air gap and the first air gap is 0.05mm-2mm.

[0018] Furthermore, the first primary iron core, the second primary iron core, and the secondary iron core are all made of silicon steel sheets or low-carbon steel magnetic materials.

[0019] Furthermore, the number of secondary teeth in the portion effectively corresponding to the primary teeth is the number of fine channel pole pairs, which can be selected as 2i, i = 3, 4, 5, 6, ..., and the number of primary teeth and the number of secondary teeth in the corresponding portion are not equal; the number of second tooth pillars in the portion effectively corresponding to the arc-shaped protrusion structure can be selected as 2j, j = 2, 3, 4, 5, 6, ...

[0020] Furthermore, the first primary iron core and the second primary iron core are of equal length, and both are greater than or less than the length of the secondary iron core. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0022] Figure 1 The attached figure is a schematic diagram of the structure of a dual-channel linear displacement sensor provided by the present invention.

[0023] Figure 2 The attached figure is a schematic diagram of the structure of a dual-channel linear displacement sensor without windings.

[0024] Figure 3 The attached diagram shows the structure of the first primary iron core and the second primary iron core, both of which are shorter than the secondary iron core.

[0025] Figure 4 The attached figure is a schematic diagram of the dual-channel linear displacement sensor of the present invention during installation.

[0026] Wherein: 1-fine channel primary component, 101-first mounting slot, 11-first primary iron core, 12-first winding, 13-first tooth post, 14-primary small tooth, 2-coarse channel primary component, 201-second mounting slot, 21-second primary iron core, 22-second winding, 23-second tooth post, 24-side tooth, 3-secondary iron core, 301-elongated air gap hole, 302-mounting hole, 31-secondary small tooth, 32-arc-shaped protrusion structure, 4-first air gap, 5-second air gap. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] See Figures 1-4 This invention discloses a dual-channel linear displacement sensor, comprising:

[0029] The primary component of the precision channel 1 includes: a first primary iron core 11 and a first winding 12. A plurality of first toothed posts 13 are arranged at equal intervals on one side of the first primary iron core 11. Each first toothed post 13 has a plurality of primary small teeth 14 at the end away from the first primary iron core 11. The first winding 12 is wound on the first toothed posts 13 through a first insulating member.

[0030] The coarse channel primary assembly 2 includes: a second primary iron core 21 and a second winding 22. A plurality of second toothed posts 23 are arranged at equal intervals on one side of the second primary iron core 21, and the second winding 22 is wound on the second toothed posts 23 through a second insulating element.

[0031] The secondary component is a secondary iron core 3, which is placed between the first primary iron core 11 and the second primary iron core 21. Multiple secondary small teeth 31 are evenly spaced on the side of the secondary iron core 3 opposite to the primary small teeth 14. The number of secondary small teeth 31 is the number of fine channel pole pairs (multiple pole pairs) of the linear displacement sensor. The secondary small teeth 31 and the primary small teeth 14 are separated to form a first air gap 4. The other side of the secondary iron core 3 opposite to the second primary iron core 21 is an arc-shaped protrusion structure 32. There is one arc-shaped protrusion structure 32, which is the number of coarse channel pole pairs (single pole pair) of the linear displacement sensor. The arc-shaped protrusion structure 32 and the second tooth post 23 are separated to form a second air gap 5.

[0032] The secondary core 3 has an elongated air gap hole 301.

[0033] The first primary iron core 11 has rounded end faces on both sides; the second primary iron core 21 has side teeth 24 on both sides at the top, the width of the side teeth 24 is equal to the width of the second tooth post 23 or the width is half the width of the second tooth post 23, and the side teeth 24 and the end of the second primary iron core 21 are connected by a rounded or oblique transition.

[0034] The first primary iron core 11 has a first mounting groove 101 at both ends, and the second primary iron core 21 has a second mounting groove 201 at both ends.

[0035] The secondary iron core 3 has mounting holes 302.

[0036] Both the first and second insulating components are insulating frames or kits made of insulating material.

[0037] The second air gap 5 is the minimum gap between the arc-shaped protrusion 32 and the second tooth post 23. The width range of the second air gap 5 and the first air gap 4 is 0.05mm-2mm.

[0038] The first primary iron core 11, the second primary iron core 21, and the secondary iron core 3 are all made of silicon steel sheets or low-carbon steel magnetic materials.

[0039] The first primary iron core 11 and the second primary iron core 21 are of equal length, and both are greater than or less than the length of the secondary iron core 3.

[0040] ①For example Figure 1 and Figure 2 When the lengths of the first primary iron core 11 and the second primary iron core 21 are equal and both are greater than the length of the secondary iron core 3, the number of secondary small teeth 31 can be selected as 2i, i = 3, 4, 5, 6, ... The number of primary small teeth 14 corresponding to the effective part of the secondary small teeth 31 is not equal to the number of secondary small teeth 31. For example, if the total number of primary small teeth 14 is 60, the number of secondary small teeth 31 is 32, and the number of primary small teeth 14 corresponding to the secondary small teeth 31 is 30.

[0041] The first winding 12 consists of an excitation winding and two sets of output windings. The excitation winding is a concentrated winding and is evenly distributed on each first tooth post 13. The two sets of output windings are a sine distribution winding and a cosine distribution winding. The number of turns of the sine distribution winding and the number of turns of the cosine distribution winding are arranged according to the number of pole pairs (the number of secondary small teeth 31 2i) and the number of primary small teeth 14 corresponding to the effective part of the secondary small teeth 31, and are arranged on the first tooth post 13 according to a sine law.

[0042] The number of second toothed pillars 23 corresponding to the effective portion of the arc-shaped protrusion structure 32 can be selected as 2j, j = 2, 3, 4, 5, 6, ... The second winding 22 consists of an excitation winding and two sets of output windings. The excitation winding is a concentrated winding and is evenly distributed on each second toothed pillar 23. The two sets of output windings are sinusoidal distributed windings and cosine distributed windings. The number of turns of the sinusoidal distributed winding and the number of turns of the cosine distributed winding are arranged according to the number of pole pairs (the number of arc-shaped protrusion structures 32 is 1) and the number of second toothed pillars 23, 2j, and arranged on the second toothed pillars 23 according to a sinusoidal law.

[0043] ②For example Figure 3When the lengths of the first primary iron core 11 and the second primary iron core 21 are equal and both less than the length of the secondary iron core 3, the number of secondary pins 31 corresponding to the effective portion of the primary pin 14 is the number of fine channel pole pairs, which can be selected as 2i, i = 3, 4, 5, 6, ..., and is not equal to the number of primary secondary pins 14. For example, if the number of primary pins is 30 and the number of secondary pins is 64, the number of secondary pins 31 corresponding to the effective portion of the primary pins 14 is 32, that is, the number of fine channel pole pairs is 32. The number of turns of the sinusoidal distributed winding and the number of turns of the cosine distributed winding are arranged according to the number of pole pairs (the number of secondary pins 31, 2i) and the number of primary pins 14 corresponding to the effective portion of the secondary pins 31, and are arranged on the first tooth post 13 according to a sinusoidal pattern.

[0044] The number of effective corresponding parts of the second tooth post 23 and the arc-shaped protrusion structure 32 can be selected as 2j, j = 2, 3, 4, 5, 6, ... The number of arc-shaped protrusion structures 32 that are effective corresponding to the second tooth post 23 is the number of coarse channel pole pairs. For example, if the number of second tooth posts 23 is 12, the number of arc-shaped protrusion structures 32 is 2, and the number of coarse channel pole pairs is 1.

[0045] When installing the dual-channel linear displacement sensor of the present invention, the two ends of the first primary iron core and the two ends of the second primary iron core can be fixed by the connecting seat 6 respectively, while the secondary iron core can be fixed on the slider 8 on the guide rail 7.

[0046] This invention relates to a dual-channel linear displacement sensor that combines a multi-pole linear displacement sensor with a single-pole linear displacement sensor. This allows for dual-channel detection, and the coarse and fine channels share a single secondary core, simplifying the structure. Furthermore, both the coarse and fine channels have their own magnetic circuits, preventing interference between magnetic lines of force and reducing electromagnetic interference, thus providing high detection accuracy. While the coarse channel has only one absolute zero (the commonly referred to zero point), the fine channel has multiple zero points due to its multiple pole pairs. Therefore, although the fine channel offers high accuracy, it cannot determine the absolute position, while the coarse channel, although less accurate, can determine the absolute position. The combination of these two channels improves both accuracy and the determination of absolute linear position. Additionally, this linear displacement sensor employs a non-contact structure between the primary components of the fine and coarse channels and the secondary core, transmitting electromagnetic signals through electromagnetic induction to achieve length detection. This results in strong environmental adaptability, a simple structure, and lower cost.

[0047] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0048] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dual-channel linear displacement sensor, characterized in that, include: A primary component (1) for a precision channel includes a first primary iron core (11) and a first winding (12). A plurality of first toothed posts (13) are arranged at equal intervals on one side of the first primary iron core (11). Each first toothed post (13) has a plurality of primary small teeth (14) at its end away from the first primary iron core (11). The first winding (12) is wound on the first toothed post (13) through a first insulating member. The coarse channel primary assembly (2) includes: a second primary iron core (21) and a second winding (22). A plurality of second toothed posts (23) are arranged at equal intervals on one side of the second primary iron core (21), and the second winding (22) is wound on the second toothed posts (23) through a second insulating member. The secondary component is a secondary iron core (3), which is placed between the first primary iron core (11) and the second primary iron core (21). A plurality of secondary small teeth (31) are evenly spaced on the side of the secondary iron core (3) opposite to the primary small teeth (14). The number of secondary small teeth (31) is the number of fine channel pole pairs of the linear displacement sensor. The secondary small teeth (31) and the primary small teeth (14) are separated to form a first air gap (4). The other side of the secondary iron core (3) opposite to the second primary iron core (21) is an arc-shaped protrusion structure (32). The arc-shaped protrusion structure (32) is the number of coarse channel pole pairs of the linear displacement sensor. The arc-shaped protrusion structure (32) and the second tooth column (23) are separated to form a second air gap (5). The secondary core (3) is provided with an elongated air gap hole (301); The first primary iron core (11) has rounded end faces on both sides; the second primary iron core (21) has side teeth (24) on the top of both sides, the width of the side teeth (24) is equal to the width of the second tooth post (23) or the width is half the width of the second tooth post (23), and the side teeth (24) and the end of the second primary iron core (21) are connected by a rounded arc or oblique line transition; The dual-channel linear displacement sensor combines a multi-pole linear displacement sensor and a single-pole linear displacement sensor. It can be used for dual-channel detection. The coarse channel has only one absolute zero, i.e., zero position, while the fine channel has multiple zero positions due to its multiple poles. Therefore, although the fine channel has high accuracy, it cannot determine the absolute position, while the coarse channel has low accuracy but can determine the absolute position. The combination of the two into a dual-channel sensor can improve accuracy and determine the absolute linear position.

2. A dual-channel linear displacement sensor according to claim 1, characterized in that, The first primary iron core (11) has a first mounting groove (101) at both ends, and the second primary iron core (21) has a second mounting groove (201) at both ends.

3. A dual-channel linear displacement sensor according to claim 1, characterized in that, The secondary core (3) has mounting holes (302).

4. A dual-channel linear displacement sensor according to claim 1, characterized in that, Both the first insulating element and the second insulating element are insulating frames or kits made of insulating materials.

5. A dual-channel linear displacement sensor according to claim 1, characterized in that, The second air gap (5) is the minimum gap between the arc-shaped protrusion structure (32) and the second tooth column (23). The width range of the second air gap (5) and the first air gap (4) is 0.05mm-2mm.

6. A dual-channel linear displacement sensor according to claim 1, characterized in that, The first primary iron core (11), the second primary iron core (21) and the secondary iron core (3) are all made of silicon steel sheets or low carbon steel magnetic materials.

7. A dual-channel linear displacement sensor according to claim 1, characterized in that, The number of secondary teeth (31) in the effective portion corresponding to the primary teeth (14) is the number of fine channel pole pairs, which can be selected as 2i, i = 3, 4, 5, 6, ... The number of primary teeth (14) and the number of secondary teeth (31) in the corresponding portion are not equal; the number of second tooth pillars (23) in the effective portion corresponding to the arc-shaped protrusion structure (32) can be selected as 2j, j = 2, 3, 4, 5, 6, ...

8. A dual-channel linear displacement sensor according to claim 1, characterized in that, The first primary iron core (11) and the second primary iron core (21) are of equal length, and both are greater than or less than the length of the secondary iron core (3).

Images