A patch type position detection sensor
By using a patch sensor in position detection technology, using a variable capacitance structure of fixed capacitors and mobile plates, high-precision position detection is achieved, solving the problem of insufficient accuracy and flexibility in the existing technology, and reducing detection Cost and expand the scope of application.
Patent Information
- Application Number
- CN201910127985.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2019-02-21
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2039-02-21
AI Technical Summary
The existing position detection technology has shortcomings in terms of accuracy and flexibility, especially the counting error of incremental detection methods affects the measurement results, and the accuracy of absolute measurement is limited by the scale resolution.
Using a patch-type position detection sensor, including a scale and a reading head, the variable capacitance is formed by n fixed capacitors and mobile plates arranged in sequence, and high-precision position detection is achieved through sinusoidal signal amplitude modulation, suitable for planes and curved surfaces Measurement.
It realizes high-precision and flexible position detection, reduces detection costs, replaces traditional optical components and etching disks, and is suitable for a variety of application scenarios.
Smart Images
Figure CN109752030B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a coding technology, an inductive voltage transformation technology, and in particular to a position detection technology. Background Art
[0002] Position detection technology is commonly used in motion control systems. As a sensor and measuring device for detecting position changes, it is widely used in military, aerospace, aviation, navigation, industry, agriculture and other fields, playing an irreplaceable role.
[0003] There are two types of position detection methods: incremental and absolute. The incremental detection method only measures the displacement increment, and a measurement signal is sent out for each measurement unit moved. The advantage is that the detection device is relatively simple, and any point can be used as the measurement starting point. The disadvantage is that the moving distance is obtained by reading the count of the measurement signal. Once the count is wrong, it will affect the subsequent measurement results.
[0004] The absolute value measurement method can avoid the above shortcomings. It selects a fixed zero point as the reference. Any measured point relative to the zero point has a corresponding measurement value. The higher the resolution of the measurement scale, the higher the accuracy of the measurement result. Since the resolution of the measurement scale is limited by the processing technology, it affects the improvement of accuracy. Summary of the invention
[0005] The technical problem to be solved by the present invention is to provide a patch type position detection sensor, which has a simple structure, flexible control, high measurement accuracy and accurate measurement results.
[0006] In order to solve the above technical problems, the patch type position detection sensor of the present invention includes a scale and a reading head, and is characterized in that the scale has n fixed capacitors arranged in sequence; the reading head includes a moving electrode plate; when the moving electrode plate moves linearly from left to right with the object to be measured, it forms a variable capacitor in turn with the right fixed electrode plate of each fixed capacitor and the air medium in the middle.
[0007] The reading head also includes a moving insulator and a moving right pole plate, and the moving pole plate, the moving insulator and the moving right pole plate together form a moving capacitor.
[0008] The scale comprises a common left plate, a common insulator, and n right fixed plates arranged in a straight line; the n right fixed plates respectively form n fixed capacitors arranged in a straight line with the common left plate and the common insulator.
[0009] The scale comprises a common left plate, a common insulator, and n right fixed plates arranged in a curvilinear sequence; the n right fixed plates respectively form n fixed capacitors arranged in a curvilinear sequence with the common left plate and the common insulator.
[0010] The scale comprises a long strip support plate, n left fixed plates arranged in a straight line and fixed on the support plate, n insulators arranged in a straight line, and n right fixed plates arranged in a straight line to form n fixed capacitors arranged in a straight line.
[0011] The scale comprises a long strip support plate, n left fixed plates arranged in a curvilinear order and fixed on the support plate, n insulators arranged in a curvilinear order, and n right fixed plates arranged in a curvilinear order to form n fixed capacitors arranged in a curvilinear order.
[0012] When in use, the left plate of the fixed capacitor is grounded, the right plate is connected to the input end of the signal processing circuit, and the moving plate or the right moving plate is connected to the output end of the sinusoidal signal generating module; the moving plate or the moving capacitor is fixed on the object to be measured. When the object to be measured moves, the area between the moving plate and the corresponding right fixed plate changes, causing the capacitance of the corresponding variable capacitor to change, thereby realizing the amplitude modulation of the sinusoidal signal; according to the pre-calibrated n output sinusoidal signal amplitudes and the positional relationship between the moving plate or the moving capacitor, the position data of the object to be measured can be obtained.
[0013] The patch position sensor of the present invention can replace traditional optical elements and engraved code disks, occupying very little space, and can satisfy both plane measurement and curved surface measurement. The position of the object to be measured is detected according to the amplitude of the measured sinusoidal signal, which can achieve high-precision position detection, greatly reduce the detection cost, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0015] Figure 1 It is a stereogram of the overall structure of the present invention.
[0016] Figure 2 It is a cross-sectional view of Example 1 of the present invention.
[0017] Figure 3 It is a cross-sectional view of Example 2 of the present invention.
[0018] Figure 4 It is an equivalent circuit diagram of embodiments 1 and 2 of the present invention.
[0019] Figure 5 It is a cross-sectional view of Example 3 of the present invention.
[0020] Figure 6 It is a cross-sectional view of Example 4 of the present invention.
[0021] Figure 7 It is the equivalent circuit diagram of embodiments 3 and 4 of the present invention.
[0022] Figure 8 It is a structural block diagram of a position detection system using the present invention. DETAILED DESCRIPTION
[0023] Example 1
[0024] like Figure 1 As shown, the patch type position detection sensor of the present invention includes a scale 1 and a reading head 2.
[0025] like Figure 2 As shown, the scale 1 includes a long common left pole plate 11 and a common insulator 12, and n right fixed pole plates 13-1, 13-2, ... 13-n arranged in a straight line; the n right fixed pole plates 13-1, 13-2, ... 13-n respectively form n fixed capacitors Cs1, Cs2, ... Csn arranged in a straight line with the common left pole plate 11 and the common insulator 12; the reading head 2 adopts a moving pole plate 21; when the moving pole plate 21 moves linearly from left to right with the measured object, it forms variable capacitors Ci1, Ci2, ... Cin in turn with the right fixed pole plates 13-1, 13-2, ... 13-n and the air medium in the middle; the common left pole plate 11 is grounded, the right fixed pole plates 13-1, 13-2, ... 13-n are connected to the input end of the signal processing circuit, and the moving pole plate 21 is connected to the output end of the sinusoidal signal generating module; the equivalent circuit is as follows Figure 4 shown.
[0026] Example 2
[0027] like Figure 1 As shown, the patch type position detection sensor of the present invention comprises a scale 1 and a reading head 2;
[0028] like Figure 3 As shown, the scale 1 includes a long strip support plate 3, n left fixed plates 11-1, 11-2, ..., 11-n and insulators 12-1, 12-2 ... 12-n fixed on the support plate 3 in a straight line, and n fixed capacitors Cs1, Cs2, ... Csn arranged in a straight line composed of right fixed plates 13-1, 13-2, ... 13-n; the reading head 2 adopts a moving plate 21; when the moving plate 21 moves linearly from left to right with the object to be measured, it sequentially forms variable capacitors Ci1, Ci2, ... Cin with the right fixed plates 13-1, 13-2, ... 13-n and the air medium in the middle; the left fixed plates 11-1, 11-2, ... 11-n are grounded, the right plates 13-1, 13-2, ... 13-n are connected to the input end of the signal processing circuit, and the moving plate 21 is connected to the output end of the sinusoidal signal generating module; the equivalent circuit is as follows Figure 4 shown.
[0029] Example 3
[0030] like Figure 1 As shown, the patch type position detection sensor of the present invention includes a scale 1 and a reading head 2.
[0031] like Figure 5 As shown, the scale 1 includes a common left plate 11, a common insulator 12, and n right fixed plates 13-1, 13-2, ... 13-n arranged in a straight line; the n right fixed plates 13-1, 13-2, ... 13-n respectively form n fixed capacitors Cs1, Cs2, ... Csn arranged in a straight line with the common left plate 11 and the common insulator 12; the reading head 2 includes a moving plate 21, a moving insulator 22 and a moving right plate 23, the three Together they constitute a moving capacitor Cmove; when the moving plate 21 moves in a straight line from left to right with the object being measured, it sequentially forms variable capacitors Ci1, Ci2, ... Cin with the right fixed plates 13-1, 13-2, ... 13-n and the air medium in the middle; the common left plate 11 is grounded, the right fixed plates 13-1, 13-2, ... 13-n are connected to the input end of the signal processing circuit, the moving plate 21 is connected to the output end of the sinusoidal signal generating module, and the moving right plate 23 is grounded; the equivalent circuit is as follows Figure 7 shown.
[0032] Example 4
[0033] like Figure 1 As shown, the patch type position detection sensor of the present invention includes a scale 1 and a reading head 2;.
[0034] like Figure 6 As shown, the scale 1 includes a long strip support plate 3, n left fixed plates 11-1, 11-2, ..., 11-n and insulators 12-1, 12-2 ... 12-n and right fixed plates 13-1, 13-2, ... 13-n arranged in a straight line and fixed on the support plate 3, forming n fixed capacitors Cs1, Cs2, ... Csn arranged in a straight line; the reading head 2 includes a moving plate 21, a moving insulator 22 and a moving right plate 23, which together form Mobile capacitor Cmove; when the mobile plate 21 moves linearly from left to right with the object to be measured, it forms variable capacitors Ci1, Ci2, ... Cin in sequence with the right fixed plates 13-1, 13-2, ... 13-n and the air medium in the middle; the left fixed plates 11-1, 11-2, ... 11-n are grounded, the right fixed plates 13-1, 13-2, ... 13-n are connected to the input end of the signal processing circuit, the mobile plate 21 is connected to the output end of the sinusoidal signal generating module, and the mobile right plate 23 is grounded; the equivalent circuit is as follows Figure 7 shown.
[0035] The present invention is not limited to the above embodiment, and the n fixed capacitors Cs1, Cs2, ..., Csn may also be arranged in the order of a circular arc curve or any other continuous curve to measure the position of an object moving along the curve.
[0036] like Figure 8 As shown, the sinusoidal signal generating module is composed of a power supply module, an LC oscillation circuit and a voltage follower connected in series, which is a prior art structure; the sinusoidal signal generated by the sinusoidal signal generating module is loaded on the patch type position sensor of the present invention, and the patch type position sensor outputs n sinusoidal signals, which are converted into digital signals by a high-speed A / D converter in the signal processing circuit, and then processed by the FPGA module, and the position data of the object to be measured can be obtained according to the amplitude changes of the n sinusoidal signals.
[0037] The power module uses a 24V DC regulated voltage source, which mainly provides continuous and stable voltage for the LC oscillation circuit and voltage follower.
[0038] LC oscillation circuit is used to generate a high-frequency oscillating sinusoidal wave signal.
[0039] The voltage follower is a common collector circuit composed of transistor 2N3393, which is used to improve the circuit's load capacity.
[0040] The high-speed A / D converter uses TI's ADS5263 chip, which is used to convert the modulated analog sinusoidal signal into a digital signal and then transmit it to the FPGA module.
[0041] The FPGA module uses Altera's EP3C40 chip to calculate the collected digital signals and obtain position measurement data.
Claims
1. A patch type position detection sensor, comprising a scale (1) and a reading head (2), characterized in that The scale (1) comprises a common left pole plate (11), a common insulator (12), and n right fixed pole plates (13-1), (13-2), ... (13-n) arranged in a straight line sequence; the n right fixed pole plates (13-1), (13-2), ... (13-n) respectively form n fixed capacitors (Cs1,) (Cs2), ... (Csn) arranged in a straight line sequence with the common left pole plate (11) and the common insulator (12); the reading head (2) comprises The invention comprises a movable electrode plate (21); when the movable electrode plate (21) moves linearly from left to right along with the object to be measured, it forms variable capacitors (Ci1), (Ci2), ... (Cin) with right fixed electrodes (13-1), (13-2), ... (13-n) of fixed capacitors (Cs1), (Cs2), ... (Csn) and the air medium in between; each right fixed electrode plate is connected to the input end of the signal processing circuit, and the movable electrode plate is connected to the output end of the sinusoidal signal generating module.
2. A patch type position detection sensor, comprising a scale (1) and a reading head (2), characterized in that The scale (1) comprises a common left pole plate (11), a common insulator (12), and n right fixed pole plates (13-1), (13-2), ... (13-n) arranged in a curvilinear sequence; the n right fixed pole plates (13-1), (13-2), ... (13-n) respectively form n fixed capacitors (Cs1), (Cs2), ... (Csn) arranged in a curvilinear sequence with the common left pole plate (11) and the common insulator (12); the reading head (2) comprises The invention comprises a movable electrode plate (21); when the movable electrode plate (21) moves linearly from left to right along with the object to be measured, it forms variable capacitors (Ci1), (Ci2), ... (Cin) with right fixed electrodes (13-1), (13-2), ... (13-n) of fixed capacitors (Cs1), (Cs2), ... (Csn) and the air medium in between; each right fixed electrode plate is connected to the input end of the signal processing circuit, and the movable electrode plate is connected to the output end of the sinusoidal signal generating module.
3. A patch type position detection sensor, comprising a scale (1) and a reading head (2), characterized in that The scale (1) comprises a long strip support plate (3), n left fixed plates (11-1), (11-2), ..., (11-n) arranged in a straight line and fixed on the support plate (3), n insulators (12-1), (12-2) ... (12-n) arranged in a straight line, and n right fixed plates (13-1), (13-2), ... (13-n) arranged in a straight line to form n fixed capacitors (Cs1), (Cs2), ... (Cs3) arranged in a straight line. sn); the reading head (2) comprises a moving electrode (21); when the moving electrode (21) moves linearly from left to right along with the object to be measured, it forms variable capacitors (Ci1), (Ci2), ... (Cin) with right fixed electrodes (13-1), (13-2), ... (13-n) of fixed capacitors (Cs1), (Cs2), ... (Csn) and the air medium in between; each right fixed electrode is connected to the input end of the signal processing circuit, and the moving electrode is connected to the output end of the sinusoidal signal generating module.
4. A patch type position detection sensor, comprising a scale (1) and a reading head (2), characterized in that The scale (1) comprises a long strip support plate (3), n left fixed plates (11-1), (11-2), ..., (11-n) arranged in a curvilinear order and fixed on the support plate (3), n insulators (12-1), (12-2) ... (12-n) arranged in a curvilinear order, and n right fixed plates (13-1), (13-2), ... (13-n) arranged in a curvilinear order to form n fixed capacitors (Cs1, (Cs2), ... (Cs3) arranged in a curvilinear order. sn); the reading head (2) comprises a moving electrode (21); when the moving electrode (21) moves linearly from left to right along with the object to be measured, it forms variable capacitors (Ci1), (Ci2), ... (Cin) with right fixed electrodes (13-1), (13-2), ... (13-n) of fixed capacitors (Cs1), (Cs2), ... (Csn) and the air medium in between; each right fixed electrode is connected to the input end of the signal processing circuit, and the moving electrode is connected to the output end of the sinusoidal signal generating module.
5. The patch type position detection sensor according to any one of claims 1 to 4, characterized in that The reading head (2) further comprises a moving insulator (22) and a moving right pole plate (23), wherein the moving pole plate (21), the moving insulator (22) and the moving right pole plate (23) together constitute a moving capacitor (Cmove).