CN111780656A - High-speed long-stroke linear displacement sensor - Google Patents
High-speed long-stroke linear displacement sensor Download PDFInfo
- Publication number
- CN111780656A CN111780656A CN202010663089.5A CN202010663089A CN111780656A CN 111780656 A CN111780656 A CN 111780656A CN 202010663089 A CN202010663089 A CN 202010663089A CN 111780656 A CN111780656 A CN 111780656A
- Authority
- CN
- China
- Prior art keywords
- reading head
- linear displacement
- stroke linear
- speed long
- magnetic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
Abstract
The application discloses high-speed long stroke linear displacement sensor, including active cell and stator, the active cell is used for driving the magnetic grid motion, and the magnetic grid is used for providing alternate change' S N/S magnetic field, installs a plurality of reading heads on the stator, when the active cell drives the magnetic grid motion to reading head top, output pulse signal. Because the magnetic grid is arranged on the rotor, and the reading head is arranged on the stator, the position of the reading head is fixed and unchanged in the moving process of the rotor, so that the limitation of poor high-speed bearing capacity of a cable in the reading head is avoided, further, the displacement information of the rotor can be fed back by a pulse signal output by the current reading head, and the purpose of normally detecting the displacement under the high-speed condition is realized.
Description
Technical Field
The application relates to the technical field of instruments and meters, in particular to a high-speed long-stroke linear displacement sensor.
Background
Currently, with the development of electronic technology, the requirement of the industrial application field for precision control in the production process is continuously increased, so that the linear displacement sensor is rapidly developed. The magnetic grid type displacement sensor has the advantages of high precision, low cost, strong pollution resistance, low installation requirement and the like, and is widely applied to various occasions needing to measure linear displacement.
Fig. 1 is a schematic structural diagram of a magnetic grid displacement sensor provided in the prior art, and as shown in fig. 1, the magnetic grid displacement sensor includes a mover 1 and a stator 2, and further includes a reading head mounted on the mover 1 and a magnetic grid 3 adhered to the stator 2. In the using process, the rotor 1 drives the reading head to move, and the reading head generates a pulse signal which feeds back the position of the rotor 1 through electromagnetic induction with the magnetic grid 3. This standard is used without limitation to the stroke length, depending on the stator length. However, the signal inside the reading head must be led out through a cable, and the cable of the general displacement sensor can bear the speed of 6m/s at most, and when the speed is too high, the cable can be broken due to pulling, and the displacement sensor cannot be used in the occasion that the speed of the moving body is high in consideration of the bearing capacity of the cable.
In view of the above-mentioned prior art, it is an urgent need for those skilled in the art to find a high-speed long-stroke linear displacement sensor capable of solving the problem of speed limitation.
Disclosure of Invention
The application aims to provide a high-speed long-stroke linear displacement sensor which can realize displacement detection under the high-speed condition.
In order to solve the above technical problem, the present application provides a high-speed long stroke linear displacement sensor, including active cell 1 and stator 2, still include:
a magnetic grid 3 mounted on the mover 2 for providing an alternating N/S magnetic field;
and the reading head is arranged on the stator 2 and used for outputting a pulse signal to calculate the displacement of the rotor 1 when the rotor 1 drives the magnetic grid 3 to move above a certain reading head.
Preferably, a plurality of said reading heads are included, each of said reading heads being evenly distributed on said stator 1.
Preferably, the distance between the reading heads is smaller than the length of the magnetic grid 3.
Preferably, the surface of the grating 3 is parallel to the sensing surface of the readhead.
Preferably, the method further comprises the following steps:
the input end of the FPGA7 is connected with the output end of the reading head, and the FPGA7 is used for calculating displacement, speed and acceleration of the rotor 7 through pulse signals.
Preferably, the method further comprises the following steps:
and the output end of the conversion circuit 6 is connected with the input end of the FPGA7 and is used for converting the pulse level into a voltage suitable for being processed by the FPGA 7.
Preferably, the method further comprises the following steps:
the input end of the isolating circuit 5 is connected with the output end of the reading head, the output end of the isolating circuit 5 is connected with the input end of the conversion circuit 6, and the isolating circuit 5 is used for shielding the interference of the peripheral magnetic field of the high-speed long-stroke linear displacement sensor.
Preferably, the read head is an incremental read head.
Preferably, the width of the magnetic signal grid bars is 5mm, and the distance between the magnetic signal grid bars is 5 mm.
Preferably, the isolation circuit 5 is specifically an optical coupling isolation circuit.
The application provides a high-speed long stroke linear displacement sensor, including active cell and stator, the magnetic grid moves along with the active cell, and the magnetic grid is used for providing alternate change' S N/S magnetic field, installs the reading head on the stator, when the active cell drives the magnetic grid and moves to current reading head top, output pulse signal. Because the magnetic grid is arranged on the rotor and the reading head is arranged on the stator, the position of the reading head is fixed and unchanged in the moving process of the rotor, so that the limitation of poor high-speed bearing capacity of a cable in the reading head is avoided, further, a pulse signal output by the reading head can feed back displacement information of the rotor, and the purpose of normally detecting the displacement under the high-speed condition is realized.
Drawings
In order to more clearly illustrate the embodiments of the present application, the drawings needed for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a schematic structural diagram of a magnetic grid displacement sensor provided in the prior art;
fig. 2 is a schematic structural diagram of a high-speed long-stroke linear displacement sensor according to an embodiment of the present disclosure;
fig. 3 is a block diagram of a high-speed long-stroke linear displacement sensor according to an embodiment of the present disclosure;
the device comprises a rotor 1, a stator 2, a magnetic grid 3, a first reading head 41, a second reading head 42, a third reading head 43, a fourth reading head 44, an isolation circuit 5, a conversion circuit 6 and an FPGA 7.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the present application.
The core of the application is to provide a high-speed long-stroke linear displacement sensor, and the purpose of normally detecting displacement under the high-speed condition is achieved.
In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings.
Fig. 2 is a schematic structural diagram of a high-speed long-stroke linear displacement sensor according to an embodiment of the present application. As shown in fig. 2, the high-speed long-stroke linear displacement sensor comprises a mover 1 and a stator 2, and further comprises a magnetic grid 3 mounted on the mover 1 for providing an alternating N/S magnetic field; and the reading head is arranged on the stator 2 and used for outputting a pulse signal to calculate the displacement of the rotor 1 when the rotor 1 drives the magnetic grid 3 to move above a certain reading head.
In the specific implementation, the position of the stator 2 is fixed and unchanged, the mover 1 drives the magnetic grid 3 to move, magnetic signal grid bars with equal intervals and positive and negative staggered polarities are distributed on the magnetic grid 3 to provide an alternative N/S magnetic field, when the magnetic grid 3 moves above a reading head, the reading head is induced by the alternative N/S magnetic poles on the magnetic grid 3, a group of A +, A-, B +, B-, Z + and Z-pulse signals are output, and the signals can feed back the displacement of the mover 1.
It should be noted that the A, B, Z signal is a standard output signal of the displacement sensor, and represents three groups of voltage pulses respectively. In specific implementation, if there is no a-, when there is electromagnetic interference near the displacement sensor, it is possible to change the originally low-level a signal into a high-level signal, that is, if the a signal is currently a 0V level, the electromagnetic interference may change the 0V level into a 5V level, which causes the system to mistakenly consider that the signal is the high level at this time, and further affects the displacement detection of the mover 1. If A + and A-are simultaneously interfered, namely if A + is 5V level and A-is 0V level, the two signals are added together or subtracted together by a certain value, the difference value between the two signals after the interference and the difference value between the two signals before the interference are unchanged, and in the subsequent processing, the displacement of the rotor 1 can be calculated according to the difference value between A + and A-.
It should be noted that fig. 2 shows that there are a plurality of reading heads, which are respectively the first reading head 41, the second reading head 42, the third reading head 43, and the fourth reading head 44, and of course, only one reading head may be installed on the stator 2, which does not affect the implementation of the present technical solution.
The application provides a high-speed long stroke linear displacement sensor, including active cell and stator, the active cell is used for driving the magnetic grid motion, and the magnetic grid is used for providing alternate change' S N/S magnetic field, installs the reading head on the stator, when the active cell drives the magnetic grid motion to the reading head top, output pulse signal. Because the magnetic grid is arranged on the rotor and the reading head is arranged on the stator, the position of the reading head is fixed and unchanged in the moving process of the rotor, so that the limitation of poor high-speed bearing capacity of a cable in the reading head is avoided, further, a pulse signal output by the reading head can feed back displacement information of the rotor, and the purpose of normally detecting the displacement under the high-speed condition is realized.
In the specific implementation, if a reading head is simply installed on the stator 2 and the magnetic grid 3 is installed on the rotor 1, although the speed limitation problem can be solved, the length of the rotor 1 cannot be infinitely long, so that the method cannot be used in the long-stroke situation.
As shown in fig. 2, on the basis of the above-mentioned embodiment, as a preferred implementation mode, the high-speed long-stroke linear displacement sensor comprises a plurality of reading heads, and the reading heads are uniformly distributed on the stator 2. The distance between the reading heads is less than the length of the magnetic grid 3. The surface of the magnetic grid 3 is kept parallel to the sensing surface of the reading head.
In specific implementation, a plurality of reading heads are uniformly distributed along the moving direction of the rotor 1, the length of the stator 2 can be prolonged according to actual conditions, the number of the reading heads on the stator 2 can be increased correspondingly, the distance between the reading heads is smaller than the length of the magnetic grid 3, when the magnetic grid 3 moves to the position above the reading heads, the reading heads are induced by N/S alternating magnetic poles on the magnetic grid, and corresponding changing pulse signals are output. It can be understood that if the distance between the reading heads is greater than or equal to the length of the magnetic grid 3, in the moving process of the magnetic grid 3, there may be no signal output between two adjacent reading heads at a certain position, and a breakpoint occurs, which affects the detection of displacement.
The high-speed long-stroke linear displacement sensor provided by the embodiment of the application can realize the purpose of normally detecting displacement on a long-stroke occasion due to the fact that the plurality of reading heads are mounted on the stator. The distance between each reading head is less than the length of the magnetic grid, so that the reading heads at corresponding positions can output signals at any positions swept by the magnetic grid. The surface of the magnetic grid is parallel to the induction surface of the reading head, so that the accuracy and the timeliness of an output result can be guaranteed, and the displacement of the rotor can be better detected.
Fig. 3 is a block diagram of a high-speed long-stroke linear displacement sensor according to an embodiment of the present invention, and based on the above-described embodiment, as a preferred embodiment, as shown in fig. 3, the high-speed long-stroke linear displacement sensor according to the embodiment of the present invention further includes an FPGA7, and an input end of the FPGA7 is connected to an output end of the reading head, and is configured to calculate displacement, speed, and acceleration of the mover 1 through a pulse signal.
As shown in fig. 3, in order to make the technical solutions provided by the present application more clear to those skilled in the art, four reading heads are taken as an example in the present embodiment for description, which are respectively a first reading head 41, a second reading head 42, a third reading head 43, and a fourth reading head 44, the length of the magnetic grid 3 is L, and the distance between the reading heads is L-N, where N is any constant smaller than L. It should be noted that only four read heads are shown in fig. 2 and 3, and more read heads may be added in the specific implementation according to the actual situation.
The following describes the detection process in detail:
when the moving displacement of the mover 1 is L-N, the second reading head 42 starts to be covered by the magnetic grid 3 on the mover 1, at this time, the first reading head 41 and the second reading head 42 both have pulse signal outputs, but the FPGA7 still extracts only the pulse signal of the first reading head 41 at this time;
when the mover 1 moves by a displacement of (L-N) + N/2, the FPGA7 changes the source of the pulse signal from the first reading head 41 to the second reading head 42. At this time, although the first reading head 41 and the second reading head 42 both have pulse signals to output, the FPGA7 only extracts the pulse signals of the second reading head 42;
when the motion displacement of the mover 1 is 2(L-N), the third reading head 43 starts to be covered by the magnetic grid 3 on the mover, and at this time, the second reading head 42 and the third reading head 43 both have pulse signals to output, but the FPGA7 still only extracts the pulse signals of the second reading head 42 at this time;
when the mover 1 moves by a displacement of 2(L-N) + N/2, the FPGA7 changes the source of the pulse signal from the second reading head 42 to the third reading head 43. At this time, although the second reading head 42 and the third reading head 43 both have pulse signals to output, the FPGA7 only extracts the pulse signals of the third reading head 43;
the above switching process is repeated until the mover 1 stops moving.
It should be noted that the pulse signal generated by each reading head swept by the magnetic grid 3 enters the FPGA7, but at the same time, the FPGA7 only uses the pulse signal generated by one reading head, and then performs pulse counting on the signal, thereby calculating the actual displacement of the mover 1. Taking pulse signals of 5V and 0V as an example, if the mover 1 moves 0.1mm within the pulse duration of 5V, after 0.1mm passes, the 5V pulse is changed into 0V, the mover 1 moves 0.1mm within the pulse duration of 0V, then the 5V pulse is jumped again, and the displacement of the mover 1 is calculated by counting the changed pulse signals. Further, the displacement is differentiated once and differentiated twice, so that the velocity and the acceleration of the mover 1 during the movement can be obtained respectively.
The high-speed long-stroke linear displacement sensor provided by the embodiment of the application has the advantages that the FPGA7 can process the pulse signals sent by the reading head, and the displacement, the speed and the acceleration of the rotor are calculated according to the pulse signals, so that the functions which can be realized by the high-speed long-stroke linear displacement sensor are increased, and the use experience of a user is improved.
On the basis of the above embodiments, as shown in fig. 3, the high-speed long-stroke linear displacement sensor provided by the embodiment of the present application further includes a conversion circuit 6, and an output terminal of the conversion circuit 6 is connected to an input terminal of the FPGA7, and is configured to convert the pulse level into a voltage suitable for processing by the FPGA 7.
In a specific implementation, since the supply voltage of the FPGA7 is 3.3V, and the pulse level output by the sensor is generally 5V, the pulse level can be converted into the input voltage of the FPGA7 by the conversion circuit 6, so that the FPGA7 operates normally.
It should be noted that the conversion circuit 6 mentioned in this embodiment is not limited to convert the voltage of 5V into the voltage of 3.3V, and may be a voltage with any amplitude to be converted into a voltage required by the FPGA.
In the specific implementation, magnetic signal grid bars with equal intervals and staggered polarities are distributed on the magnetic grid 3, and the widths of the N-pole magnetic signal grid bar and the S-pole magnetic signal grid bar are both 5 mm.
It should be noted that the magnetic grid array of the present embodiment is not limited to the array according to the rule of 5+5mm, and may be any N + N rule.
On the basis of the above embodiments, as shown in fig. 3, the high-speed long-stroke linear displacement sensor provided in the embodiment of the present application further includes an isolation circuit 5, an input end of the isolation circuit 5 is connected to an output end of the reading head, an output end of the isolation circuit 5 is connected to an input end of the conversion circuit 6, and the isolation circuit 5 is used for shielding interference of a magnetic field around the high-speed long-stroke linear displacement sensor. As a preferred embodiment, the isolation circuit provided in the embodiments of the present application is specifically an optical coupling isolation circuit.
In the implementation, in order to improve the accuracy of displacement detection, an isolation circuit 5 needs to be added to resist interference. The optical coupler isolation circuit is widely applied by the characteristics of random adjustable duty ratio, high isolation withstand voltage and strong anti-interference capability, and further, the linear optical coupler is particularly suitable for signal feedback.
It should be noted that, in the embodiment of the present application, a specific type of the isolation circuit is not limited, and the isolation circuit may be a chip such as a TLP521 or a pc817 according to a specific situation, which does not affect the implementation of the present technical solution.
On the basis of the above embodiments, as a preferred embodiment, the reading head provided by the embodiment of the present application is an incremental reading head.
In a specific implementation, the type of the reading head is not limited, and the reading head may be an absolute reading head or an incremental reading head, and the incremental reading head used in the embodiment of the present application is only a preferred embodiment. In the occasion of not so high requirement to operation, incremental reading head is used with its simple structure, advantage with low costs.
The high-speed long-stroke linear displacement sensor provided by the application is described in detail above. The embodiments are described in a progressive manner in the specification, 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. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. The utility model provides a high-speed long stroke linear displacement sensor, includes active cell (1) and stator (2), its characterized in that still includes:
a magnetic grid (3) mounted on the mover (1) for providing an alternating N/S magnetic field;
and the reading head is arranged on the stator (2) and used for outputting a current pulse signal to calculate the displacement of the rotor (1) when the rotor (1) drives the magnetic grid (3) to move above the current reading head.
2. A high-speed long-stroke linear displacement sensor according to claim 1, comprising a plurality of said reading heads, each of which is uniformly distributed on said stator (1).
3. A high speed long stroke linear displacement transducer according to claim 2 wherein the spacing of the read heads is less than the length of the grating (3).
4. A high speed long stroke linear displacement transducer according to claim 1, wherein the surface of the magnetic grating (3) is maintained parallel to the sensing surface of the readhead.
5. A high speed long stroke linear displacement transducer according to claim 1 and also comprising:
the input end of the FPGA (7) is connected with the output end of the reading head and used for calculating the displacement, the speed and the acceleration of the rotor (1) through pulse signals.
6. A high speed long stroke linear displacement transducer according to claim 5 and also comprising:
and the output end of the conversion circuit (6) is connected with the input end of the FPGA (7) and is used for converting the pulse level into a voltage suitable for being processed by the FPGA (7).
7. A high speed long stroke linear displacement transducer according to claim 6 and also comprising:
the input end of the isolating circuit (5) is connected with the output end of the reading head, the output end of the isolating circuit (5) is connected with the input end of the conversion circuit (6), and the isolating circuit (5) is used for shielding the interference of the peripheral magnetic field of the high-speed long-stroke linear displacement sensor.
8. A high speed long stroke linear displacement transducer according to claim 3 wherein said read head is an incremental read head.
9. A high speed long stroke linear displacement transducer according to claim 1 wherein said magnetic signal bars are 5mm wide and each said magnetic signal bar is spaced 5mm apart.
10. A high-speed long-stroke linear displacement sensor according to claim 7, characterized in that the isolation circuit (5) is embodied as an opto-isolator circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010663089.5A CN111780656A (en) | 2020-07-10 | 2020-07-10 | High-speed long-stroke linear displacement sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010663089.5A CN111780656A (en) | 2020-07-10 | 2020-07-10 | High-speed long-stroke linear displacement sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111780656A true CN111780656A (en) | 2020-10-16 |
Family
ID=72768811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010663089.5A Pending CN111780656A (en) | 2020-07-10 | 2020-07-10 | High-speed long-stroke linear displacement sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111780656A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023016156A1 (en) * | 2021-08-11 | 2023-02-16 | 苏州汇川控制技术有限公司 | Communication-type magnetic scale read head, magnetic scale apparatus, electric motor module and position measurement method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090278711A1 (en) * | 2006-08-01 | 2009-11-12 | Continental Teves Ag & Co. Ohg | Sensor Arrangement for the Precise Detection of Relative Movements Between An Encoder and A Sensor |
| CN103940332A (en) * | 2014-04-30 | 2014-07-23 | 江苏百协精锻机床有限公司 | Magnetic grating displacement transducer based on Hall magnetic sensitive element array |
| CN205526371U (en) * | 2016-03-20 | 2016-08-31 | 深圳安格锐电气有限公司 | Linear transmission module piece and transmission module group that constitutes thereof |
| CN109839059A (en) * | 2019-02-01 | 2019-06-04 | 南京理工大学 | A kind of ship rotary axis phase angle measurement device and method |
| CN110365168A (en) * | 2018-04-02 | 2019-10-22 | 中山市欧派克五金制品有限公司 | A kind of linear motor and mover displacement measurement method for sliding door |
| CN110968122A (en) * | 2019-11-28 | 2020-04-07 | 歌尔股份有限公司 | Position acquisition method of linear transmission system and linear transmission system |
-
2020
- 2020-07-10 CN CN202010663089.5A patent/CN111780656A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090278711A1 (en) * | 2006-08-01 | 2009-11-12 | Continental Teves Ag & Co. Ohg | Sensor Arrangement for the Precise Detection of Relative Movements Between An Encoder and A Sensor |
| CN103940332A (en) * | 2014-04-30 | 2014-07-23 | 江苏百协精锻机床有限公司 | Magnetic grating displacement transducer based on Hall magnetic sensitive element array |
| CN205526371U (en) * | 2016-03-20 | 2016-08-31 | 深圳安格锐电气有限公司 | Linear transmission module piece and transmission module group that constitutes thereof |
| CN110365168A (en) * | 2018-04-02 | 2019-10-22 | 中山市欧派克五金制品有限公司 | A kind of linear motor and mover displacement measurement method for sliding door |
| CN109839059A (en) * | 2019-02-01 | 2019-06-04 | 南京理工大学 | A kind of ship rotary axis phase angle measurement device and method |
| CN110968122A (en) * | 2019-11-28 | 2020-04-07 | 歌尔股份有限公司 | Position acquisition method of linear transmission system and linear transmission system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023016156A1 (en) * | 2021-08-11 | 2023-02-16 | 苏州汇川控制技术有限公司 | Communication-type magnetic scale read head, magnetic scale apparatus, electric motor module and position measurement method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201787917U (en) | High-accuracy magnetic displacement transducer | |
| CN88103289A (en) | Position detector | |
| CN111780656A (en) | High-speed long-stroke linear displacement sensor | |
| CN103557782A (en) | Linear motor positioning method based on switch Hall sensor sequential coding | |
| CN105806201B (en) | Displacement measuring device and displacement measurement method | |
| CN102998043B (en) | Device and method for monitoring dynamic thrust of linear motor in suspension state | |
| CN101458261A (en) | Speed characteristic detection device for breaker permanent magnet linear electric motor operation mechanism | |
| CN103234456B (en) | Ultrahigh resolution linear encoder | |
| CN100494877C (en) | Device for measuring distance between moving object and its railway | |
| CN100386592C (en) | Long measuring range displacement sensor with waterproof function | |
| CN213778897U (en) | High-precision linear displacement detection device | |
| CN2165421Y (en) | Optoelectric tachometer flow indicator | |
| CN207588743U (en) | A kind of motor rotary transformer position detecting device | |
| CN209375384U (en) | A kind of permanent magnet linear synchronous motor magnetic pole detection system | |
| CN102914248B (en) | Passive type linear encoder | |
| CN102679859B (en) | Displacement sensor and method for measuring displacement by using same | |
| CN218997872U (en) | Photoelectric encoder applied to knitting equipment | |
| US10107652B2 (en) | Method for measuring displacements of object | |
| CN109687650A (en) | A kind of permanent magnet linear synchronous motor magnetic pole detection system | |
| CN218850570U (en) | Linear motor encoder and linear motor | |
| SU702319A1 (en) | Apparatus for producing speed response | |
| CN215550966U (en) | 3D printer including synchronous belt of magnetic grid | |
| CN216206048U (en) | Lengthened line displacement sensor | |
| CN115342718A (en) | Displacement test sensor test system based on laboratory environment | |
| CN2287294Y (en) | Large range automatic calibertape with raster digital display |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201016 |