CN215810903U - Inductance type increment type high-precision encoder with cable-free rotor - Google Patents
Inductance type increment type high-precision encoder with cable-free rotor Download PDFInfo
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- CN215810903U CN215810903U CN202121393151.XU CN202121393151U CN215810903U CN 215810903 U CN215810903 U CN 215810903U CN 202121393151 U CN202121393151 U CN 202121393151U CN 215810903 U CN215810903 U CN 215810903U
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Abstract
The utility model discloses an inductance type increment high-precision encoder with a cable-free rotor, which comprises a reading plate and a rotor, wherein the rotor is positioned above the reading plate, the reading plate is used for reading displacement information of the rotor fixedly connected with a detected moving part, the reading plate comprises a plurality of detection parts which are arranged in an array mode, and each detection part comprises an excitation coil code channel and a receiving coil code channel. The utility model discloses a cable-free inductive incremental high-precision encoder for a rotor, which is characterized in that the rotor is detected by a plurality of detection parts arranged in an array, each detection part comprises an excitation coil and a plurality of periodic receiving coils, and when the encoder works, the displacement information of the rotor is fed back by the detection part with the largest rotor coverage area, so that the high-precision displacement information can be output in the whole range.
Description
Technical Field
The utility model belongs to the technical field of encoders, and particularly relates to an inductance type incremental high-precision encoder with a cable-free rotor.
Background
When the device is used for measuring the displacement of a straight line or a circular arc, the current encoder such as a grating ruler and a magnetic grating ruler generally adopts a mode of adding a reading head to measure, the grating ruler is installed on a fixed frame of the device, the reading head is installed on a measured moving part, the reading head identifies the position through reading code channel information of the grating ruler, and position information is transmitted through an encoder cable connected with the reading head. The encoder is not suitable for long-distance detection, or occasions with high moving speed or occasions with moving parts which do not reciprocate in one direction because the reading head comprises a cable. Meanwhile, because the encoder cable always moves along with the reading head, the service life of the cable is short, and the transmission reliability is reduced due to damages such as joints, wire cores and shielding.
Another type of linear displacement measuring device, such as a linear displacement transducer using the magnetostrictive principle, has a magnetic ring attached to a moving part, which has no cable. However, the sensor of the type has the characteristics of low precision, low allowable motion speed, large time delay and the like, and is not suitable for high-speed and high-precision position detection in the motion control occasion.
Therefore, the above problems are further improved.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a cable-free inductive incremental high-precision encoder for a rotor, which detects the rotor through a plurality of detection parts arranged in an array, wherein the detection parts comprise an excitation coil and a plurality of periods of receiving coils, and when the encoder works, the detection parts with the largest coverage area of the rotor always feed back the displacement information of the rotor, so that the high-precision displacement information can be output in the whole range.
Another object of the present invention is to provide a cableless inductive incremental high-precision encoder for linear and circular displacements, which is suitable for high-precision and high-speed position feedback.
In order to achieve the above object, the present invention provides an inductance type incremental high-precision encoder with a cableless mover, comprising a reading plate and a mover, wherein the mover is located above the reading plate and the reading plate is used for reading displacement information of the mover fixedly connected to a detected moving part, wherein:
the reading board comprises a plurality of detection components which are arranged in an array, each detection component comprises an excitation coil code channel and a receiving coil code channel, an excitation coil is arranged in the excitation coil code channel, a receiving coil is arranged in the receiving coil code channel, the excitation coil is used for sending out a high-frequency excitation signal, and the receiving coil is used for receiving an alternating electromagnetic field generated by the high-frequency excitation signal and outputting a detection signal;
the mover includes a first grid of metallization and a second grid of non-metal, the first grid and the second grid being alternately arranged, and a width of the first grid and the second grid being equal to a half cycle width of the receiving coil.
As a more preferable mode of the above mode, the reading plate is fixedly attached to a fixed frame (of the device), and the mover is fastened to the detected moving member by a screw.
As a further preferable technical solution of the above technical solution, each of the detection components is disposed in the same circuit board, each of the detection components further includes a stator coil, a signal processing unit, a calculation unit (for calculating a signal amplitude of a detection signal) and a transmission unit (for transmitting position information of the mover to an upper computer), and the signal processing unit is electrically connected to the calculation unit and the transmission unit, respectively.
As a further preferable embodiment of the above-mentioned technical means, the detection signal includes a sin + signal, a sin-signal, a cos + signal and a cos-signal.
As a further preferable mode of the above-described mode, the detecting means includes first detecting means including a first exciting coil and a first receiving coil, second detecting means including a second exciting coil and a second receiving coil, and third detecting means including a third exciting coil and a third receiving coil.
Drawings
Fig. 1 is a schematic structural diagram of an inductance type incremental high-precision encoder with a rotor without cables according to the present invention.
The reference numerals include: 1. a reading board; 111. a first excitation coil; 112. a first receiving coil; 121. a second excitation coil; 122. a second receiving coil; 131. a third excitation coil; 132. a third receiving coil; 2. a mover; 21. a first grid; 22. a second grid.
Detailed Description
The following description is presented to disclose the utility model so as to enable any person skilled in the art to practice the utility model. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the utility model, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the utility model.
The utility model discloses an inductance type increment type high-precision encoder with a rotor without cables, and the specific embodiment of the utility model is further described by combining the preferred embodiment.
In the embodiment of the present invention, those skilled in the art note that the upper computer, the fixed frame, the signal processing unit, the device, the detected moving part, and the like related to the present invention can be regarded as the prior art.
A first embodiment.
The utility model provides an inductance type increment high-precision encoder with a cable-free rotor, which comprises a reading plate 1 and a rotor 2, wherein the rotor 2 is positioned above the reading plate 1, the reading plate 1 is used for reading displacement information of the rotor 2 fixedly connected with a detected moving part, and the inductance type increment high-precision encoder comprises:
the reading board comprises a plurality of detection components which are arranged in an array, each detection component comprises an excitation coil code channel and a receiving coil code channel, an excitation coil is arranged in the excitation coil code channel, a receiving coil is arranged in the receiving coil code channel, the excitation coil is used for sending out a high-frequency excitation signal, and the receiving coil is used for receiving an alternating electromagnetic field generated by the high-frequency excitation signal and outputting a detection signal;
the mover includes a first metalized grid and a second non-metallic grid, the first and second grids are alternately arranged, the length of the mover is preferably equal to the length of the two detection parts (when the encoder is in operation, the detection part with the largest covering area of the mover feeds back displacement information of the mover all the time, so that high-precision displacement information can be output in the whole range), and the widths of the first and second grids are equal to the half-cycle width of the receiving coil.
Specifically, the reading board is fixedly mounted on a fixed frame (of the device), and the mover is fastened to the detected moving part through a screw.
More specifically, each of the detection components is disposed in the same circuit board, and each of the detection components further includes a stator coil, a signal processing unit, a calculation unit (for calculating a signal amplitude of a detection signal), and a transmission unit (for transmitting position information of the mover to an upper computer), and the signal processing unit is electrically connected to the calculation unit and the transmission unit, respectively.
It is worth mentioning that, strictly speaking, not every detection component includes an independent signal processing unit, a calculation unit and a transmission unit, and from the viewpoint of cost and volume, every several detection components can share 1 signal processing unit, calculation unit and transmission unit, and different detection components are multiplexed and can be performed by gating.
Further, the detection signal includes a sin + signal, a sin-signal, a cos + signal, and a cos-signal.
Preferably, the code channel of the receiving coil comprises a first code channel and a second code channel, the first grid corresponds to the first code channel, the width of the grid is equal to 1/2 of the code channel period, and the distance between the grids is also 1/2 of the code channel period; the second grid corresponds to the second code track, and the grid width is equal to 1/2 widths of the code track period.
Preferably, the calculating unit of each detecting component calculates the amplitude of the signal fed back by the detecting component, and when the amplitude of the signal exceeds a preset limit value, the mover is indicated to be above the detecting component. If only the detection part n meets the requirement, the detection part n is used as a main unit for current position feedback to carry out rotor absolute position calculation, and data are sent to an upper computer; if both the detecting member n and the detecting member n +1 are satisfied, the relative positional relationship between the detecting member n +1 and the detecting member n can be used to know that the mover is above the detecting member n in a certain period before the moment, and therefore, the absolute position data of the mover can be obtained.
Preferably, when the encoder is in operation, the excitation coil of the detection component emits a high-frequency excitation signal, and the receiving coils are arranged according to the coil, so that the four paths of signals with the phase relation of sin +, sin-, cos + and cos-can be formed. The excitation signal generates an alternating electromagnetic field in the air, when the rotor is above the current detection component, the alternating electromagnetic field is influenced by the metal grid of the encoder rotor, the space electromagnetic field is changed, and the space electromagnetic field is received by the receiving coil to form a sin +, sin-, cos +, cos-four-path signal. The detection part judges whether the rotor is mainly in the detection part according to the signal obtained by self detection and the signal state obtained by the adjacent detection part, if the rotor is mainly in the detection part, the detection part obtains a current displacement value through position calculation according to a feedback signal and sends rotor position information to the upper computer.
Each detection part calculation unit calculates the amplitude of the signal fed back by the detection part, performs sequencing comparison, calculates the angle of the detection part signal with the maximum amplitude and outputs position information. When the encoder rotor moves, amplitude comparison is continuously carried out, if amplitude sequencing changes, the detection component with the largest amplitude is still used for position calculation, and rotor position information is sent to the upper computer.
A second embodiment.
The utility model provides an inductance type increment high-precision encoder with a cable-free rotor, which comprises a reading plate 1 and a rotor 2, wherein the rotor 2 is positioned above the reading plate 1, the reading plate 1 is used for reading displacement information of the rotor 2 fixedly connected with a detected moving part, and the inductance type increment high-precision encoder comprises:
the reading board comprises a plurality of detection components which are arranged in an array, each detection component comprises an excitation coil code channel and a receiving coil code channel, an excitation coil is arranged in the excitation coil code channel, a receiving coil is arranged in the receiving coil code channel, the excitation coil is used for sending out a high-frequency excitation signal, and the receiving coil is used for receiving an alternating electromagnetic field generated by the high-frequency excitation signal and outputting a detection signal;
the mover includes a first metalized grid and a second non-metallic grid, the first and second grids are alternately arranged, the length of the mover is preferably equal to the length of the two detection parts (when the encoder is in operation, the detection part with the largest covering area of the mover feeds back displacement information of the mover all the time, so that high-precision displacement information can be output in the whole range), and the widths of the first and second grids are equal to the half-cycle width of the receiving coil.
Specifically, the reading board is fixedly mounted on a fixed frame (of the device), and the mover is fastened to the detected moving part through a screw.
More specifically, each of the detection components is disposed in the same circuit board, and each of the detection components further includes a stator coil, a signal processing unit, a calculation unit (for calculating a signal amplitude of a detection signal), and a transmission unit (for transmitting position information of the mover to an upper computer), and the signal processing unit is electrically connected to the calculation unit and the transmission unit, respectively.
It is worth mentioning that, strictly speaking, not every detection component includes an independent signal processing unit, a calculation unit and a transmission unit, and from the viewpoint of cost and volume, every several detection components can share 1 signal processing unit, calculation unit and transmission unit, and different detection components are multiplexed and can be performed by gating.
Further, the detection signal includes a sin + signal, a sin-signal, a cos + signal, and a cos-signal.
Preferably, as shown in fig. 1, the detection means includes first detection means including a first excitation coil 111 and a first receiving coil 112, second detection means including a second excitation coil 121 and a second receiving coil 122, and third detection means including a third excitation coil 131 and a third receiving coil 132.
Preferably, the code channel of the receiving coil comprises a first code channel and a second code channel, the first grid corresponds to the first code channel, the width of the grid is equal to 1/2 of the code channel period, and the distance between the grids is also 1/2 of the code channel period; the second grid corresponds to the second code track, and the grid width is equal to 1/2 widths of the code track period.
Preferably, the calculating unit of each detecting component calculates the amplitude of the signal fed back by the detecting component, and when the amplitude of the signal exceeds a preset limit value, the mover is indicated to be above the detecting component. If only the detection part n meets the requirement, the detection part n is used as a main unit for current position feedback to carry out rotor absolute position calculation, and data are sent to an upper computer; if both the detecting member n and the detecting member n +1 are satisfied, the relative positional relationship between the detecting member n +1 and the detecting member n can be used to know that the mover is above the detecting member n in a certain period before the moment, and therefore, the absolute position data of the mover can be obtained.
Preferably, when the encoder is in operation, the excitation coil of the detection component emits a high-frequency excitation signal, and the receiving coils are arranged according to the coil, so that the four paths of signals with the phase relation of sin +, sin-, cos + and cos-can be formed. The excitation signal generates an alternating electromagnetic field in the air, when the rotor is above the current detection component, the alternating electromagnetic field is influenced by the metal grid of the encoder rotor, the space electromagnetic field is changed, and the space electromagnetic field is received by the receiving coil to form a sin +, sin-, cos +, cos-four-path signal. The detection part judges whether the rotor is mainly in the detection part according to the signal obtained by self detection and the signal state obtained by the adjacent detection part, if the rotor is mainly in the detection part, the detection part obtains a current displacement value through position calculation according to a feedback signal and sends rotor position information to the upper computer.
Each detection part calculation unit calculates the amplitude of the signal fed back by the detection part, performs sequencing comparison, calculates the angle of the detection part signal with the maximum amplitude and outputs position information. When the encoder rotor moves, amplitude comparison is continuously carried out, if amplitude sequencing changes, the detection component with the largest amplitude is still used for position calculation, and rotor position information is sent to the upper computer.
It should be noted that the technical features of the upper computer, the fixed frame, the signal processing unit, the device, the detected moving part, and the like, which are referred to in the patent application of the present invention, should be regarded as the prior art, and the specific structure, the working principle, the control mode and the spatial arrangement mode of the technical features, which may be referred to, should be chosen conventionally in the field, and should not be regarded as the utility model point of the present invention, and the present invention is not further specifically described in detail.
It will be apparent to those skilled in the art that modifications and equivalents may be made in the embodiments and/or portions thereof without departing from the spirit and scope of the present invention.
Claims (5)
1. The utility model provides a runner does not have inductance formula increment type high accuracy encoder of cable which characterized in that, includes reading board and runner, the runner is located the top of reading board and the reading board is used for reading the displacement information of the runner of being connected with the detection moving part is fixed, wherein:
the reading board comprises a plurality of detection components which are arranged in an array, each detection component comprises an excitation coil code channel and a receiving coil code channel, an excitation coil is arranged in the excitation coil code channel, a receiving coil is arranged in the receiving coil code channel, the excitation coil is used for sending out a high-frequency excitation signal, and the receiving coil is used for receiving an alternating electromagnetic field generated by the high-frequency excitation signal and outputting a detection signal;
the mover includes a first grid of metallization and a second grid of non-metal, the first grid and the second grid being alternately arranged, and a width of the first grid and the second grid being equal to a half cycle width of the receiving coil.
2. The cableless inductive incremental high precision encoder according to claim 1, wherein said reading plate is fixedly mounted on a fixed frame, and said mover is fastened to the moving part to be detected by screws.
3. The cableless inductive incremental high-precision encoder according to claim 1, wherein each of said detecting members is disposed on a same circuit board, each of said detecting members further comprises a stator coil, a signal processing unit, a calculating unit and a transmitting unit, said signal processing unit is electrically connected to said calculating unit and said transmitting unit respectively.
4. The cableless inductive incremental high precision encoder according to claim 3, wherein the detection signals comprise sin + signals, sin-signals, cos + signals and cos-signals.
5. The cableless inductive incremental high precision encoder according to claim 4, wherein said detecting means comprises a first detecting means comprising a first exciting coil and a first receiving coil, a second detecting means comprising a second exciting coil and a second receiving coil, and a third detecting means comprising a third exciting coil and a third receiving coil.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121393151.XU CN215810903U (en) | 2021-06-22 | 2021-06-22 | Inductance type increment type high-precision encoder with cable-free rotor |
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| CN202121393151.XU CN215810903U (en) | 2021-06-22 | 2021-06-22 | Inductance type increment type high-precision encoder with cable-free rotor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117606525A (en) * | 2023-11-08 | 2024-02-27 | 浙江锐鹰传感技术有限公司 | Rotor position detection sensor and flexible conveying line system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117606525A (en) * | 2023-11-08 | 2024-02-27 | 浙江锐鹰传感技术有限公司 | Rotor position detection sensor and flexible conveying line system |
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