CN112762810A

CN112762810A - Cylindrical linear displacement sensor

Info

Publication number: CN112762810A
Application number: CN202110082009.1A
Authority: CN
Inventors: 张晓宇; 祁倩; 陈凡
Original assignee: Jiangmen Polytechnic
Current assignee: Jiangmen Polytechnic
Priority date: 2021-01-21
Filing date: 2021-01-21
Publication date: 2021-05-07

Abstract

The invention discloses a cylindrical linear displacement sensor, comprising: a cylindrical stator, the stator comprising: the stator structure comprises a plurality of stator toothed rings, a plurality of magnetic conduction rings and a plurality of annular winding coils, wherein the stator toothed rings are arranged in parallel at intervals along the axial direction of the stator toothed rings; the rotor iron core shaft penetrates through the cylindrical channel, the surface profile of the rotor iron core shaft is of a wavy or tooth-groove-shaped structure, and an air gap is formed between the rotor iron core shaft and the cylindrical channel. The stator and the rotor iron core shaft adopt a non-contact structure, transmit electromagnetic signals through electromagnetic induction, and have the advantages of simple structure, low cost, impact vibration resistance, high temperature, low temperature, humidity, dust, oil stain and the like.

Description

Cylindrical linear displacement sensor

Technical Field

The invention relates to the technical field of length detection elements, in particular to a cylindrical linear displacement sensor.

Background

The linear detection sensor mainly comprises a grating ruler, a magnetic grating ruler and some capacitance and inductance sensors, the grating ruler is more applied to the aspect of length displacement detection due to the advantages of the grating ruler, but the principle characteristic and the structural characteristic of the grating ruler determine that the grating ruler has higher requirements on the use environment, such as dust, oil stain and strong impact and vibration, the precision of the grating ruler is possibly deteriorated or damaged, the structure is more complex and the cost is higher. The sensor is characterized by comprising a flat structure cylindrical linear displacement sensor based on a variable reluctance principle, wherein the sensor is impact-resistant and vibration-resistant, and is suitable for severe environments.

Therefore, the technical personnel in the field need to solve the problem of how to provide a cylindrical linear displacement sensor which has high electrical precision, is suitable for high-speed operation, has strong environmental adaptability, simple structure and low price.

Disclosure of Invention

In view of the above, the present invention provides a cylindrical linear displacement sensor which has high electrical accuracy, is suitable for high-speed operation, has strong environmental adaptability, simple structure and low price.

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

a cylindrical linear displacement sensor comprising:

a stator, which is cylindrical, and which includes: the stator structure comprises a plurality of stator toothed rings, a plurality of magnetic conduction rings and a plurality of annular winding coils, wherein the stator toothed rings are arranged in parallel at intervals along the axial direction of the stator toothed rings, the magnetic conduction rings are embedded and fixed at the outer edges between every two adjacent stator toothed rings, a stator tooth socket is formed in a space defined by the magnetic conduction rings and the two adjacent stator toothed rings, the annular winding coils are embedded in the stator tooth socket, and a cylindrical channel is formed in a space defined by the inner annular walls of the stator toothed rings and the inner annular walls of the annular winding coils;

the rotor iron core shaft penetrates through the cylindrical channel, the surface profile of the rotor iron core shaft is of a wavy or tooth-groove-shaped structure, and an air gap is formed between the rotor iron core shaft and the cylindrical channel.

According to the technical scheme, compared with the prior art, the cylindrical linear displacement sensor disclosed by the invention has the advantages that a non-contact structure is adopted between the stator and the rotor iron core shaft, and the length detection is realized by transmitting electromagnetic signals through electromagnetic induction, so that the cylindrical linear displacement sensor has the advantages of simple structure, low cost, impact vibration resistance, high temperature, low temperature, humidity, dust, oil stain resistance and the like. Meanwhile, the stator adopts a cylindrical structure and is not opened or closed in the transverse direction, so that the magnetic field is uniformly distributed along the axial direction, the transverse side end effect is avoided, the radial tension is mutually offset, and the unilateral magnetic tension is basically avoided; and the annular winding coil in the invention is composed of the annular coil without the coil end part, thereby increasing the winding utilization rate.

Furthermore, the surface profile of the rotor iron core shaft is of a wavy structure, and the number of convex arcs of the effective coupling part of the rotor iron core shaft and the stator is the number of pole pairs of the cylindrical linear displacement sensor; or the surface profile of the rotor iron core shaft is of a tooth groove-shaped structure, and the number of tooth grooves of the effective coupling part of the rotor iron core shaft and the stator is the pole pair number of the cylindrical linear displacement sensor.

Further, the number of pole pairs may be selected from i, i is 1, 2, 3, 4, 5, … …; the number of the stator tooth rings can be 2j +1, and j is 2, 3, 4, 5 and … …; the number of the ring winding coils is 2j, j is 2, 3, 4, 5, … …, and i is not equal to j.

Furthermore, the ring winding coil includes excitation winding and signal output winding, excitation winding is by a plurality of equal-turn ring coil equipartitions in every stator tooth's socket, and every ring coil separates the groove coiling direction unanimously to establish ties in proper order and constitute, signal output winding includes sine signal output winding and cosine signal output winding, the number of turns of sine signal output winding and the number of turns of cosine signal output winding number of turns basis the number of pole pairs reaches ring winding coil number arranges according to the sine law in the stator tooth's socket.

Furthermore, the outer edge between the magnetic conduction ring and the two adjacent stator gear rings is welded or bonded or fixed by epoxy potting.

Further, the air gap is the minimum gap between the stator gear ring and the rotor iron core shaft, and the size range of the air gap is 0.05-2 mm.

Furthermore, the stator gear ring, the magnetic conduction ring and the rotor iron core shaft are made of magnetic conduction materials.

Further, the magnetic conductive material is a silicon steel sheet or low-carbon steel.

Further, the length of the stator is greater than or less than that of the rotor iron core shaft.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a cylindrical linear displacement sensor in a first embodiment of the invention.

Fig. 2 is a schematic structural diagram of the semicircular stator toothed ring and the semicircular magnetic conductive ring in fig. 1 during assembly.

Fig. 3 is a schematic structural diagram of a cylindrical linear displacement sensor in a second embodiment of the invention.

Wherein: 1-stator, 11-stator toothed ring, 12-magnetic ring, 13-annular winding coil, 101-stator tooth slot, 102-cylindrical channel, 2-rotor iron core shaft, 21-convex arc, 22-tooth slot and 3-air gap.

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.

Referring to fig. 1 to 3, an embodiment of the present invention discloses a cylindrical linear displacement sensor, including:

stator 1, stator 1 are cylindric, and stator 1 includes: the stator structure comprises a plurality of stator toothed rings 11, a plurality of magnetic conduction rings 12 and a plurality of annular winding coils 13, wherein the plurality of stator toothed rings 11 are arranged in parallel at intervals along the axial direction of the stator toothed rings, the magnetic conduction rings 12 are embedded at the outer edges between two adjacent stator toothed rings 11, a stator tooth slot 101 is formed in a space enclosed between the magnetic conduction rings 12 and the two adjacent stator toothed rings 11, the annular winding coils 13 are embedded in the stator tooth slot 101, and a cylindrical channel 102 is formed in a space enclosed by the inner annular walls of the plurality of stator toothed rings 11 and the inner annular walls of the plurality of annular winding coils 13;

the rotor iron core shaft 2 is arranged in the cylindrical channel 102 in a penetrating mode, the surface profile of the rotor iron core shaft 2 is of a wavy (see figure 1) or tooth-groove-shaped (see figure 3) structure, and an air gap 3 is formed between the rotor iron core shaft 2 and the cylindrical channel 102.

The surface contour of the rotor iron core shaft 2 is of a wavy structure, and the number of the convex arcs 21 of the effective coupling part of the rotor iron core shaft 2 and the stator 1 is the number of pole pairs of the cylindrical linear displacement sensor; or the surface contour of the rotor iron core shaft 2 is a tooth groove-shaped structure, and the number of tooth grooves 22 of the effective coupling part of the rotor iron core shaft and the stator 1 is the pole pair number of the cylindrical linear displacement sensor.

The number of pole pairs is selected to be i, i is 1, 2, 3, 4, 5, … …; the number of the stator gear rings 11 can be selected to be 2j +1, wherein j is 2, 3, 4, 5, … …; the number of the loop winding coils 13 is 2j, j is 2, 3, 4, 5, … …, and i ≠ j.

For the convenience of measurement, the axial length of the rotor iron core shaft 2 is greater than the axial length of the stator, or the axial length of the rotor iron core shaft 2 is less than the axial length of the stator.

The contact surfaces of the annular winding coil, the stator gear ring and the magnetic conduction ring are subjected to insulation treatment, and if the surface of the annular winding coil can be adhered with an insulating material.

The annular winding coil 13 comprises an excitation winding and a signal output winding, the excitation winding is formed by uniformly distributing a plurality of annular coils with equal turns in each stator tooth slot 101, the winding directions of the annular coils at intervals are consistent (such as clockwise, anticlockwise, clockwise and anticlockwise … …), and are connected in series in sequence, the signal output winding comprises a sine signal output winding and a cosine signal output winding, the number of turns of sine signal output windings and the number of turns of cosine signal output windings are distributed according to the number i of pole pairs and the number 2j of ring winding coils according to a sine rule and are wound into ring coils to be connected and arranged in a stator tooth slot, the outlet ends S1 and S2 of the excitation winding, the outlet ends S3 and S4 of the sine signal output winding, and the outlet ends S5 and S6 of the cosine signal output winding can be respectively led out through outlet slots (not marked) formed on the stator tooth ring.

When the cylindrical linear displacement sensor is installed, the annular winding coils can be wound firstly and then installed in the stator tooth grooves one by one, lead wires on the coils are led out through wire outlet grooves formed in the stator tooth rings, a plurality of annular winding coils are connected in a welding mode according to requirements, and then the magnetic conduction rings are installed; or the stator gear ring is sleeved on the rotor iron core shaft firstly, the annular coil is integrally wound, and all the coils are not connected by welding, so that the reliability of the product can be improved, and the production strength is reduced.

The outer edge between the magnetic conductive ring 12 and the two adjacent stator gear rings 11 is welded or bonded or fixed by epoxy potting.

The air gap 3 is the minimum clearance between the stator toothed ring 11 and the rotor iron core shaft 2, and the size range of the air gap is 0.05-2 mm.

The stator toothed ring 11, the magnetic conductive ring 12 and the rotor iron core shaft 2 are made of magnetic conductive materials such as silicon steel sheets or low-carbon steel.

The transverse side end effect means weakening of a magnetic field at a boundary due to transverse disconnection of the stator, and the stator in the invention adopts a cylindrical structure and has no transverse disconnection, so that the magnetic field is uniformly distributed along the axial direction, the transverse side end effect is avoided, radial tension is mutually counteracted, and single-side magnetic tension is basically avoided; meanwhile, the inner diameters of the stator gear rings at the two ends of the stator can be increased, namely, air gaps at the two sides are increased, the longitudinal side end effect can be weakened, and the product precision is further improved. And each winding coil in the invention is composed of the annular coil without the coil end part, thereby increasing the winding utilization rate.

The during operation, the stator can be fixed with the sensor casing, active cell iron core axle is connected on the equipment that needs measurement linear displacement, when active cell iron core axle was pull, the air gap size changes, arouse the magnetic resistance change in the magnetic circuit, thereby make the output voltage of sine, cosine signal output winding change according to sine, cosine law, and then confirm the size and the direction of active cell iron core axle displacement volume, realize measuring linear displacement, the structure is practical reliable, measurement accuracy is high, output signal is strong, good repeatability, and have shock-resistant vibration, high temperature low temperature, humidity, dust and oil stain advantage such as, can be used to the environment abominable, in the displacement measurement system that the reliability requirement is high.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended 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 cylindrical linear displacement sensor, is characterized in that, comprises:

A stator (1), wherein the stator (1) is cylindrical, and the stator (1) comprises: a plurality of stator tooth rings (11), a plurality of magnetically conductive rings (12) and a plurality of annular winding coils (13) ), a plurality of the stator toothed rings (11) are arranged in parallel and spaced apart along the axial direction thereof, the magnetic conductive rings (12) are embedded at the outer edge between two adjacent stator toothed rings (11), And the space enclosed between the magnetic conducting ring (12) and the adjacent two stator tooth rings (11) forms a stator tooth slot (101), and the annular winding coil (13) is embedded in the stator tooth In the slot (101), the space enclosed by the inner ring walls of the plurality of stator tooth rings (11) and the inner ring walls of the plurality of annular winding coils (13) forms a cylindrical channel (102);

A mover iron shaft (2), the mover iron shaft (2) is penetrated in the cylindrical channel (102), and the surface contour of the mover iron shaft (2) is wavy or toothed In the shape of a structure, there is an air gap (3) between the mover iron core shaft (2) and the cylindrical channel (102).

2. A cylindrical linear displacement sensor according to claim 1, characterized in that, the surface profile of the mover iron core shaft (2) is a wave-like structure, and the mover iron core shaft (2) and the The number of convex arcs (21) of the effective coupling part of the stator (1) is the number of pole pairs of the cylindrical linear displacement sensor; The number of the tooth slots (22) of the effective coupling part with the stator (1) is the number of pole pairs of the cylindrical linear displacement sensor.

3. A cylindrical linear displacement sensor according to claim 2, characterized in that, the number of pole pairs can be selected as i, i=1, 2, 3, 4, 5, ...; the The number of stator tooth rings (11) can be selected as 2j+1, j=2, 3, 4, 5, ...; the number of the annular winding coils (13) is 2j, j=2, 3, 4, 5, ..., and i≠j.

4. A cylindrical linear displacement sensor according to claim 3, characterized in that the toroidal winding coil (13) comprises an excitation winding and a signal output winding, and the excitation winding is composed of a plurality of equal-turn toroidal coils. Distributed in each of the stator slots (101), and the winding directions of each toroidal coil are consistent with each other, and are formed in series in sequence, the signal output winding includes a sine signal output winding and a cosine signal output winding, the sine The number of turns of the signal output winding and the number of turns of the cosine signal output winding are arranged in the stator slots (101) according to the number of the pole pairs and the number of the toroidal winding coils (13) according to the sine law. Inside.

5 . The cylindrical linear displacement sensor according to claim 1 , wherein the outer edge between the magnetic conductive ring ( 12 ) and the adjacent two stator tooth rings ( 11 ) is welded or welded. 6 . Adhesive fixation or epoxy potting fixation.

6 . The cylindrical linear displacement sensor according to claim 1 , wherein the air gap ( 3 ) is between the stator gear ring ( 11 ) and the mover iron core shaft ( 2 ). 7 . The minimum gap between them is in the range of 0.05-2mm.

7. A cylindrical linear displacement sensor according to claim 1, characterized in that, the stator gear ring (11), the magnetic conductive ring (12) and the mover iron core shaft (2) The materials are all magnetic conductive materials.

8 . The cylindrical linear displacement sensor according to claim 7 , wherein the magnetic conductive material is silicon steel sheet or low carbon steel. 9 .

9 . The cylindrical linear displacement sensor according to claim 1 , wherein the length of the stator ( 1 ) is greater than or less than the length of the mover iron core shaft ( 2 ). 10 .