CN109186658B - Calibration test device and method for conductive plastic potentiometer - Google Patents
Calibration test device and method for conductive plastic potentiometer Download PDFInfo
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Abstract
The invention discloses a calibration test device and a calibration test method for a conductive plastic potentiometer, wherein the device comprises a T-shaped table, a motor control cabinet, data acquisition equipment, a PC (personal computer) system, a servo motor, a high-precision encoder and a potentiometer, wherein the servo motor, the high-precision encoder and the potentiometer are arranged on the T-shaped table; the method can be used for carrying out calibration test on the conductive plastic potentiometer, in the rotating process of the potentiometer, a data acquisition device is used for synchronously recording the output voltage value of the potentiometer and the angle value output by the high-precision encoder in the process, the output voltage of the potentiometer is taken as a horizontal coordinate, the output angle of the high-precision encoder is taken as a vertical coordinate, the change curve of the actual running voltage of the potentiometer along with the angle is obtained, and then the real corner corresponding to the voltage of any point is obtained, so that the calibration of the conductive plastic potentiometer is completed. The invention can realize the quick calibration of the conductive plastic potentiometer, reduce the test cost, shorten the research and development period and have greater popularization value.
Description
Technical Field
The invention belongs to the field of calibration of sensors, and particularly relates to a conductive plastic potentiometer calibration test device and method.
Background
In a control system of a position marker, a precise conductive plastic potentiometer is often used as an angular displacement sensor for angle feedback of the control system due to small size, convenient angle calculation, simple interface and the like, but due to the material, manufacturing and other reasons of the potentiometer, the voltage and the real angle are not in a real linear relation, and the angle obtained by a frequency-voltage conversion coefficient used for engineering calculation has a large error, so that the precision of the potentiometer cannot meet the requirement if more precise angle calculation such as return difference calculation of the position marker is carried out.
The method for measuring the return difference and the transmission error of the transmission chain commonly used in engineering is to connect a photoelectric encoder to an input shaft and an output shaft respectively, and then obtain the return difference or the transmission error by comparing the angles of the connected encoders. However, because the whole size of the position marker is small, the return difference and the transmission error of the position marker cannot be measured in a mode of adding a sensor, the conversion of angles can be carried out only through the sensor inside the position marker, the sensor inside the position marker comprises a conductive plastic potentiometer and a speed measuring motor, but the precision is not high, most of researches are to calibrate the pressure sensor, the gyroscope and the like, and the researches to calibrate the conductive plastic potentiometer to improve the measurement precision are rare.
Disclosure of Invention
The invention provides a conductive plastic potentiometer calibration test device and a method aiming at the defects of the prior conductive plastic potentiometer calibration test technology.
The invention is realized by adopting the following technical scheme:
a calibration test device for a conductive plastic potentiometer comprises a T-shaped table, a motor control cabinet, data acquisition equipment, a PC system, a standard direct-current stabilized voltage power supply, a servo motor, a high-precision encoder and the potentiometer, wherein the servo motor, the high-precision encoder and the potentiometer are arranged on the T-shaped table; wherein,
the servo motor is arranged on the T-shaped table through the servo motor support, two ends of the high-precision encoder are arranged on the T-shaped table through the first encoder support and the second encoder support, the potentiometer is arranged on the T-shaped table through the potentiometer support, the output end of the servo motor is connected with one end of the high-precision encoder through the first coupler, and the other end of the high-precision encoder is connected with the potentiometer through the second coupler;
the motor control cabinet is used for controlling the angle and the speed of the servo motor during rotation, the output end of the high-precision encoder and the output end of the potentiometer are connected to the input end of the data acquisition equipment through data lines, the output end of the data acquisition equipment is connected to the input end of the PC system, the PC system is used for operating upper computer control software and is used for setting a file storage position, and meanwhile, the data acquisition equipment sends a data acquisition instruction and terminates the acquisition instruction.
The invention is further improved in that the working angle range of the potentiometer is 0-340 degrees, the angle rotation range of the servo motor is-160 degrees to +160 degrees, and the overrange is prevented.
The invention has the further improvement that the T-shaped table is provided with a T-shaped groove, and the T-shaped groove is respectively connected with the servo motor bracket, the first encoder bracket, the second encoder bracket and the potentiometer bracket through T-shaped nuts.
The invention has the further improvement that the first coupling adopts an elastic coupling to prevent the impact influence of start-stop type of the servo motor, and the second coupling adopts a rigid coupling to ensure that the high-precision encoder and the potentiometer coaxially and simultaneously rotate.
The invention is further improved in that the servo motor adopts a Mitsubishi servo motor and is used for driving the high-precision encoder and the potentiometer to rotate.
The invention is further improved in that the high-precision encoder adopts an incremental encoder for calculating the rotation angle of the potentiometer in real time.
The invention is further improved in that the data acquisition device is an NI multifunctional data acquisition card module.
A calibration test method for a conductive plastic potentiometer is based on the calibration test device for the conductive plastic potentiometer, and comprises the following steps:
carrying out calibration test on a potentiometer made of conductive plastic to obtain an output voltage signal in the rotation process of the potentiometer, and determining the rotation angle of the potentiometer through the range of a potentiometer range; the high-precision encoder is coaxially connected with the potentiometer to obtain the rotating angle of the high-precision encoder in the rotating process of the potentiometer, and the output voltage of the potentiometer is calibrated through the angle of the high-precision encoder; in the rotation process of the potentiometer, data of the potentiometer and the high-precision encoder are simultaneously acquired by using data acquisition equipment, and the servo motor is set to operate in a position control mode, so that the rotation angle is conveniently adjusted;
during testing, the servo motor rotates to drive the potentiometer and the high-precision encoder to synchronously rotate, the output voltage value of the potentiometer and the output angle value of the high-precision encoder in the process are synchronously recorded, the output angle value of the high-precision encoder is used as a real angle, the output voltage of the potentiometer is used as a horizontal coordinate, the output angle of the high-precision encoder is used as a vertical coordinate, a change curve of the voltage of the potentiometer in actual operation along with the angle is obtained, and then a real rotating angle corresponding to any voltage point is obtained, so that the potentiometer calibration of the conductive plastic is completed.
The invention has the following beneficial technical effects:
the calibration test device for the conductive plastic potentiometer, provided by the invention, can be operated once to obtain the real angle corresponding to the output voltage of the potentiometer, so that the calibration time and the calibration complexity of the potentiometer are greatly shortened; the servo motor arranged on the T-shaped table is connected with the electric control system through a data line, the servo motor, the high-precision encoder and the potentiometer support are fixed on the T-shaped table, and the high-precision encoder, the potentiometer and the data acquisition system are connected through the data line. In the rotating process of the servo motor, the data acquisition system can synchronously acquire and record high-precision encoder angle data and voltage data in real time, the data acquisition system is connected with the PC end, and the PC end can store and read acquired signals. In conclusion, the device provided by the invention can be used for effectively calibrating the conductive plastic potentiometer, the time cost can be saved, and the structural operation of the test environment device is simpler.
The invention provides a calibration test method of a conductive plastic potentiometer, which is based on the sensor calibration principle and used for inquiring delivery specification parameters of the conductive plastic potentiometer on a potentiometer to obtain the measuring range of the conductive plastic potentiometer; a servo motor is adopted to drive a potentiometer, the potentiometer is powered by a standard direct current voltage stabilizing source, the servo motor is controlled by an electric control system, the servo motor works in a position control mode, and the rotating angle does not exceed the range of a potential metering range; when the potentiometer is calibrated, a data acquisition device is used for simultaneously acquiring a high-precision encoder signal and a potentiometer signal, and finally, one-to-one calibration of voltage and angle is carried out, so that the measurement precision of the potentiometer is improved. The test result shows that: by the method, the similar conductive plastic potentiometer can be quickly calibrated, so that the test cost can be reduced; and the measurement accuracy of the potentiometer is improved through the calibration parameters obtained through experiments, so that powerful support can be provided for the accurate angle measurement of the potentiometer.
In summary, the invention adopts a data acquisition scheme of synchronously acquiring the analog signal and the digital signal based on the data acquisition card, acquires the digital signal of the high-precision encoder while acquiring the analog voltage signal of the potentiometer, and ensures the one-to-one matching of the angle and the voltage; based on the error generation principle of the conductive plastic potentiometer and the factory specifications of the potentiometer, determining the measuring range of the potentiometer and taking the measuring range as the rotation angle basis of a servo motor position control mode, wherein the servo motor, the high-precision encoder and the potentiometer are coaxially connected to determine the calibration movement scheme of the potentiometer; the axial fixing and calibrating device can ensure that the servo motor, the high-precision encoder and the potentiometer are coaxially fixed on the corresponding support, and meanwhile, the support can be tightly connected with the T-shaped workbench. Therefore, the invention can realize the quick calibration of the conductive plastic potentiometer, reduce the test cost, shorten the research and development period and have greater popularization value.
Drawings
FIG. 1 is a flow chart of a conductive plastic potentiometer calibration test method of the present invention;
FIG. 2 is a schematic view of a calibration experiment data acquisition device according to the present invention;
FIG. 3 is a flow chart of a potentiometer movement scheme;
fig. 4 is a schematic view of the overall structure of the axial fixing and calibrating device.
In the figure: a T-shaped table 201, a motor control cabinet 202, data acquisition equipment 203, a PC system 204 and a standard direct current voltage stabilizing source 205;
401 is a servo motor, 402 is a first coupler, 403 is a high-precision encoder, 404 is a second coupler, 405 is a potentiometer, 406 is a servo motor bracket, 407 is a first encoder bracket, 408 is a second encoder bracket, and 409 is a potentiometer bracket.
Detailed Description
In order to make the purpose and technical solution of the present invention more apparent, the present invention is further described in detail with reference to the accompanying drawings.
As shown in fig. 1, the calibration test method for the conductive plastic potentiometer provided by the invention comprises the following steps:
a calibration test data acquisition scheme is formulated, and real-time synchronous acquisition of potentiometer data and high-precision encoder data is realized; the potentiometer data are analog voltage signals, analog channel measurement is needed, the high-precision encoder is digital pulse signals, digital channel measurement is needed, and the sampling rate and the sampling time of the analog channel and the digital channel are the same.
And (3) establishing a potentiometer movement scheme: obtaining the measuring range of the potentiometer by analyzing the potentiometer error mechanism of the conductive plastic and inquiring the specification of the potentiometer; setting a servo motor to work in a position control mode, wherein the rotating angle range is the measuring range of the potentiometer 405; then the potentiometer is driven to rotate by starting the servo motor.
Designing an axial fixing and calibrating device: in order to enable the servo motor, the encoder and the potentiometer to be coaxially connected and simultaneously ensure that the moving process is not loosened, a set of calibration test device for axial fixation is designed by combining the existing threaded holes of the motor, the encoder and the potentiometer.
Building a data acquisition system and a test bed: and after the data acquisition scheme, the stress application scheme and the preparation work of the hard disk clamp are completed, establishing a test environment.
Data acquisition: after the test environment is set up, a calibration test of the conductive plastic potentiometer is formally carried out, the servo motor is started through the electric control system, the servo motor rotates within a specified angle range, and meanwhile, data acquisition work of the potentiometer and the encoder is carried out.
Referring to fig. 2 and 4, the conductive plastic potentiometer calibration test device provided by the invention comprises a T-shaped table 201, an electric control cabinet 202, a data acquisition device 203, a PC system 204, a standard dc voltage regulator 205, a servo motor 401, a first coupler 402, a high-precision encoder 403, a second coupler 404, a potentiometer 405, a servo motor bracket 405, a first encoder bracket 407, a second encoder bracket 408 and a potentiometer bracket 409.
The T-shaped table 201 is connected with the servo motor support 406, the first encoder support 407, the second encoder support 408 and the potentiometer support 409, the bottom surface of each support is overlapped with the top surface of the T-shaped table 201, and the supports and the T-shaped table 201 are fixed through bolt connection, so that severe vibration caused by movement is prevented. The servo motor support 406 is connected with the servo motor 401 through a bolt of a motor base, the first encoder support 407 is connected with the high-precision encoder 403 through a bolt on a mounting base of the high-precision encoder 403, and the second encoder support 408 and the first encoder support 407 internally comprise a rolling shaft and a bearing cover which are used for placing a rotating shaft. The potentiometer support 409 is connected to the potentiometer 405 by means of a screw-on fastening. The first coupler 402 is an elastic coupler, so that impact influence in the starting and stopping processes of the servo motor 401 is reduced, and meanwhile, a servo motor shaft and the high-precision encoder 403 are connected. The second coupling 404 is a rigid coupling, which connects the high-precision encoder 403 and the potentiometer 405, in order to ensure that the high-precision encoder 403 and the potentiometer 405 rotate at the same angle at any time.
The T-shaped table 201 is used for placing the servo motor 401, the high-precision encoder 403, the potentiometer 405 and a support of the servo motor 401, and the support is guaranteed to be fixed and not to loosen when the servo motor 401 drives the high-precision encoder 403 and the potentiometer 405 to rotate.
The servo motor 401 of the invention adopts a Mitsubishi servo motor which is used for driving the high-precision encoder 403 and the potentiometer 405 to rotate, and the incremental encoder selected by the high-precision encoder 403 is used for calculating the rotation angle of the potentiometer 405 in real time.
The motor control cabinet 202 is used for setting the servo motor 401 to work in a position control mode, and the rotation range is within the measuring range of the potentiometer 405.
The data acquisition device 203 is used for acquiring digital signals and analog voltage signals output by the high-precision encoder 403 and the potentiometer 405 in real time.
The PC system 204 is configured to run upper computer control software, and is configured to set a file storage location, and send a data acquisition instruction and an acquisition termination instruction to the data acquisition device 203.
A standard dc voltage regulator 205 is used to power the conductive plastic potentiometer.
Referring to fig. 2 and 4, the invention can fix the potentiometer 405, the servo motor 401 and the high-precision encoder 403 of conductive plastic on the T-shaped table 201 through respective supports, and simultaneously keep the axial directions parallel, when the servo motor 401 rotates, the high-precision encoder 403 and the potentiometer 405 are driven to rotate coaxially, and the data wires are used for connecting the signals of the high-precision encoder 403 and the potentiometer 405 with the data acquisition equipment 203.
The data acquisition device 203 of the present invention is an NI multifunctional data acquisition card module, which can acquire both analog signals and digital signals, and the data acquisition device 203 receives signals from the high precision encoder 403 and the potentiometer 405 through a data line, and also receives data acquisition and data storage instructions from the PC system 204 through an upper computer, and packs and temporarily stores the read data in a computer.
As shown in FIG. 3, the method is realized by the following steps when a potentiometer calibration movement scheme is established:
Step 302, determining a range: for a conductive plastic potentiometer to be calibrated, the factory specifications of the potentiometer 405 are checked to obtain the range of the motion range of the potentiometer 405, the range determines the rotation angle range of the potentiometer 405 in the calibration process, and the potentiometer fails when the rotation angle range exceeds the range, so that the range is determined to ensure that the angle of the potentiometer in the calibration process is reasonable.
Claims (8)
1. A conductive plastic potentiometer calibration test device is characterized by comprising a T-shaped table (201), a motor control cabinet (202), data acquisition equipment (203), a PC system (204), a standard direct current stabilized voltage power supply (205), a servo motor (401) arranged on the T-shaped table (201), a high-precision encoder (403) and a potentiometer (405); wherein,
the servo motor (401) is arranged on the T-shaped table (201) through a servo motor support (406), two ends of the high-precision encoder (403) are arranged on the T-shaped table (201) through a first encoder support (407) and a second encoder support (408), the potentiometer (405) is arranged on the T-shaped table (201) through a potentiometer support (409), the output end of the servo motor (401) is connected with one end of the high-precision encoder (403) through a first coupler (402), and the other end of the high-precision encoder (403) is connected with the potentiometer (405) through a second coupler (404);
the motor control cabinet (202) is used for controlling the angle and the speed of the servo motor (401) during rotation, the output end of the high-precision encoder (403) and the output end of the potentiometer (405) are connected to the input end of the data acquisition device (203) through data lines, the output end of the data acquisition device (203) is connected to the input end of the PC system (204), and the PC system (204) is used for operating upper computer control software and setting a file storage position and sending a data acquisition instruction and a data acquisition termination instruction to the data acquisition device (203).
2. The conductive plastic potentiometer calibration test device according to claim 1, wherein the working angle range of the potentiometer (405) is 0-340 degrees, and the angular rotation range of the servo motor (401) is-160 degrees to +160 degrees, so as to prevent over-range.
3. The conductive plastic potentiometer calibration test device according to claim 1, wherein a T-shaped groove is formed in the T-shaped table (201), and the T-shaped groove is respectively connected with the servo motor support (406), the first encoder support (407), the second encoder support (408) and the potentiometer support (409) through T-shaped nuts.
4. The conductive plastic potentiometer calibration test device according to claim 1, wherein the first coupling (402) is an elastic coupling to prevent impact effect of start and stop of the servo motor (401), and the second coupling (404) is a rigid coupling to ensure that the high-precision encoder (403) and the potentiometer (405) rotate coaxially and simultaneously.
5. The conductive plastic potentiometer calibration test device according to claim 1, wherein the servo motor (401) is a Mitsubishi servo motor for driving the high-precision encoder (403) and the potentiometer (405) to rotate.
6. The conductive plastic potentiometer calibration test device as claimed in claim 1, wherein the high precision encoder (403) is an incremental encoder for calculating the rotation angle of the potentiometer (405) in real time.
7. The conductive plastic potentiometer calibration test device according to claim 1, wherein the data acquisition device (203) is an NI multifunctional data acquisition card module.
8. A conductive plastic potentiometer calibration test method is characterized in that the method is based on the conductive plastic potentiometer calibration test device of any one of claims 1 to 7, and comprises the following steps:
calibrating and testing a potentiometer (405) made of conductive plastic to obtain an output voltage signal in the rotating process of the potentiometer (405), and determining the rotating angle of the potentiometer (405) through the measuring range of the potentiometer (405); the high-precision encoder (403) is coaxially connected with the potentiometer (405), so that the rotating angle of the high-precision encoder (403) in the rotation process of the potentiometer (405) is obtained, and the output voltage of the potentiometer (405) is calibrated through the angle of the high-precision encoder (403); in the rotation process of the potentiometer (405), data of the potentiometer (405) and data of the high-precision encoder (403) are simultaneously acquired by using the data acquisition equipment (203), and the servo motor (401) is set to operate in a position control mode, so that the rotation angle is convenient to adjust;
during testing, the servo motor (401) rotates to drive the potentiometer (405) and the high-precision encoder (403) to synchronously rotate, the output voltage value of the potentiometer (405) and the angle value output by the high-precision encoder (403) in the process are synchronously recorded, the angle value output by the high-precision encoder (403) is used as a real angle, the output voltage of the potentiometer (405) is used as a horizontal coordinate, the output angle of the high-precision encoder (403) is used as a vertical coordinate, a change curve of the voltage of the potentiometer (405) in actual operation along with the angle is obtained, and then a real rotation angle corresponding to any point of voltage is obtained, so that calibration of the potentiometer (405) made of conductive plastics is completed.
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| CN110779556B (en) * | 2019-11-26 | 2024-07-16 | 西安航天信控科技有限公司 | Potentiometer full-scale angle calibration device and method based on incremental encoder |
| CN113419203A (en) * | 2021-05-12 | 2021-09-21 | 中核核电运行管理有限公司 | Maintenance and calibration method for B push rod potentiometer assembly of material loading and unloading machine |
| CN114442591B (en) * | 2022-01-11 | 2024-01-30 | 中国华能集团清洁能源技术研究院有限公司 | Method, system and medium for testing channel precision of I/O card |
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| CN202582584U (en) * | 2011-12-31 | 2012-12-05 | 北京和光飞翼机电科技有限公司 | Testing device for angle transducer |
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