CN210774488U - Signal compensation circuit of magnetoelastic sensor - Google Patents
Signal compensation circuit of magnetoelastic sensor Download PDFInfo
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- CN210774488U CN210774488U CN201921814741.8U CN201921814741U CN210774488U CN 210774488 U CN210774488 U CN 210774488U CN 201921814741 U CN201921814741 U CN 201921814741U CN 210774488 U CN210774488 U CN 210774488U
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Abstract
The utility model relates to a signal compensation circuit of a magnetoelastic sensor, which carries out temperature compensation and linear compensation on the sensor, and firstly, after the voltage of a measuring coil of the sensor is divided by a circuit comprising a thermistor, the voltage is enough to form the temperature compensation circuit of the sensor to form measuring voltage; then, a current transformer samples a current signal of a magnet exciting coil of the sensor, and the current signal is superposed on a measuring voltage through a signal collecting circuit board to form linear compensation for the sensor. The compensated sensor output signal corrects the measurement error caused by temperature change and load change, and ensures the accuracy of the measuring force value of the magnetoelastic sensor.
Description
Technical Field
The utility model relates to a signal compensation technique, in particular to magnetoelastic sensor's signal compensation circuit.
Background
A magnetoelastic sensor is a sensor for measuring forces, which isThe basic principle is based on the piezomagnetic effect, when the sensor is subjected to an elastic stress sigma or residual stress generated by a mechanical force F, the change of the mechanical force is converted into the change of the magnetic permeability mu of the sensor magnetizer, namely, the magnetic resistance R of a magnetic circuit is causedmThe variation of (2) is processed by the measuring circuit to output a voltage V signal, a series of transformations of which can be expressed as F → sigma → mu → Rm→ V. The magnetoelastic sensor converts a non-electric quantity such as a force into an electric quantity, and is therefore also called a magnetoelastic transducer. The magnetoelastic sensor has the advantages of large output power, strong signal, simple structure, firm structure, low cost, convenient manufacture and the like, works reliably and can be reliably used under severe working conditions.
As shown in fig. 1, which is a schematic diagram of a magnetoelastic sensor, the magnetoelastic sensor is formed by laminating a plurality of silicon steel sheets with the same size, and four holes in the middle cross and wind a conducting wire, so as to form two groups of coils which are orthogonal in space and are respectively called an excitation coil W12 and a measurement coil W34. The excitation coil is connected to an alternating-current excitation power supply, and under the condition of no external force loading, the electromagnetic coupling of the excitation coil and the measuring coil is zero; when the sensor is stressed, the magnetic lines of force are distorted and deformed and are interlinked with the measuring coil, and the voltage induced in the measuring coil is in a linear relation with the stress value. The ratio of the output voltage of the coil to the force applied by the sensor is called the sensitivity of the sensor.
The magnetoelastic sensor is widely applied to industries such as metallurgy and papermaking, is a key component in a plate rolling force and strip tension measurement control system, has high working environment temperature, and needs to correct output signals of the sensor through temperature compensation. The output signal of the magnetoelastic sensor is susceptible to sensitivity reduction, i.e., poor linearity, under a large load, and therefore, it is also necessary to perform linear compensation correction on the output signal to improve the accuracy of the output signal.
Disclosure of Invention
The utility model discloses a to the problem of the precision that improves magnetoelastic sensor output signal, provided a magnetoelastic sensor's signal compensation circuit, carried out temperature compensation and linear compensation to the output signal of sensor, revised the measuring error who arouses because of temperature variation and load change, guaranteed the measurement accuracy nature of sensor.
The technical scheme of the utility model is that: a magnetoelastic sensor is electromagnetically coupled with a measuring coil through an excitation coil, and the measuring coil outputs voltage as a sensor measuring output signal, wherein a thermistor R5 acquires the temperature inside the sensor, the excitation coil of the magnetoelastic sensor is connected with the primary side of a current transformer, the secondary side of the current transformer is connected with a signal acquisition circuit board, and two output ends of the secondary side of the current transformer are connected in parallel with a current sampling resistor R1 to form a linear compensation circuit; the sensor measuring coil is connected with the signal collecting circuit board, two ends of the sensor measuring coil are connected with the measuring and collecting resistors R2, R4 and R3 which are connected in series to form a measuring and collecting loop, the thermistor R5 is connected in parallel with two ends of the resistor R3 to form the measuring and collecting loop with temperature compensation, the thermistor R5 is connected in parallel with the resistor R3 and then connected in series with the resistor R4 to form a voltage dividing circuit, and two ends of the voltage dividing circuit are used for outputting voltage to the measuring and collecting loop with temperature compensation; the voltage at the two ends of the current sampling resistor R1 of the linear compensation circuit is superposed with the output voltage of the measurement acquisition loop with temperature compensation to form a measurement output signal of the sensor.
The beneficial effects of the utility model reside in that: the utility model discloses magnetoelastic sensor's signal compensation circuit can revise and arouse the error because of temperature variation, and the sensor sensitivity that can compensate heavy load again and arouse reduces, revises the linearity error promptly. The accuracy of the output signal of the sensor is ensured, and the subsequent instrument can process the signal conveniently, so that the accuracy of the measured force value is ensured. The force sensor is widely applied to industries such as metallurgy, papermaking and the like, and is a key component in a plate rolling force and strip tension measurement control system.
Drawings
FIG. 1 is a schematic diagram of a magnetoelastic sensor;
fig. 2 is a circuit diagram of the present invention for implementing the signal compensation device of the magnetoelastic sensor.
Detailed Description
The signal compensation for the magnetoelastic sensor specifically means temperature compensation and linear compensation for the sensor. For temperature compensation, the output impedance of the measuring coil of the sensor at high temperature is increased, so that the output voltage is reduced, the thermistor and the sensor are installed together by utilizing the characteristic that the resistance value of the thermistor changes along with the temperature, the internal temperature of the sensor is measured, the voltage of the measuring coil of the sensor is divided by a circuit of the thermistor, and then the measuring voltage is formed, so that the temperature compensation function of the sensor is achieved. For linear compensation, considering that the magnetic permeability of the sensor along the stress direction is reduced after the sensor is stressed, the impedance of the excitation coil is reduced, so that the excitation current is increased, the defect that the output sensitivity of the measuring coil is reduced when the measuring coil is under a heavy load, namely the linearity is deteriorated, can be compensated by utilizing the characteristic that the stress of the excitation current is increased, the voltage frequency of the excitation current and the voltage frequency of the measuring coil are the same, the phases are consistent, the current signal of the excitation coil of the sensor is sampled by the current transformer, and the current signal is superposed on the measuring voltage signal through the signal acquisition circuit board, so that the linear compensation is. The compensated sensor output signal corrects the measurement error caused by temperature change and load change, and ensures the accuracy of the measuring force value of the magnetoelastic sensor.
The thermistor is arranged on the signal acquisition circuit board, the sensor measuring coil is connected to the signal acquisition circuit board, and the thermistor acquires the temperature inside the sensor; the primary side of the current transformer is connected with a sensor magnet exciting coil, and the secondary side of the current transformer is connected with a signal acquisition circuit board. The signal acquisition circuit board and the sensor are fixed together. The voltage of the measuring coil of the sensor is divided by a circuit comprising a thermistor to form measuring voltage, so that the temperature compensation function of the sensor is achieved. The current transformer samples the current signal of the excitation coil of the sensor, and the current signal is superposed on the measured voltage signal through the signal acquisition circuit board to form linear compensation for the sensor. The compensated sensor output signal corrects the measurement error caused by temperature change and load change, and ensures the accuracy of the measuring force value of the magnetoelastic sensor.
As shown in the implementation circuit diagram of fig. 2, the excitation coil of the magnetoelastic sensor is connected to the primary side of the current transformer, and after the secondary side of the current transformer is connected to the signal acquisition circuit board, the two output terminals of the secondary side of the current transformer are connected in parallel to the current sampling resistor R1, thereby forming a linear compensation circuit. The sensor measuring coil is connected with the signal collecting circuit board, two ends of the sensor measuring coil are connected with the measuring and collecting resistors R2, R4 and R3 which are connected in series to form a measuring and collecting loop, the thermistor R5 is connected in parallel with two ends of the resistor R3 to form the measuring and collecting loop with temperature compensation, the thermistor R5 is connected in parallel with the resistor R3 and then connected in series with the resistor R4 to form a voltage dividing circuit, and the resistance value of the thermistor R5 follows the temperature change of the sensor to perform temperature compensation on the measuring signal. One end of the current sampling resistor R1 is grounded, the other end of the current sampling resistor R1 is connected with the series connection point of the resistors R2 and R4, the linear compensation voltage and the temperature compensation voltage are superposed to form a measurement output signal of the sensor, the accuracy of the output signal of the sensor is ensured, and the subsequent instrument can process a force value signal conveniently.
Claims (1)
1. A magnetoelastic sensor is electromagnetically coupled with a measuring coil through an excitation coil, and the measuring coil outputs voltage as a sensor measuring output signal, wherein a thermistor R5 acquires the temperature inside the sensor, the excitation coil of the magnetoelastic sensor is connected with the primary side of a current transformer, the secondary side of the current transformer is connected with a signal acquisition circuit board, and two output ends of the secondary side of the current transformer are connected in parallel with a current sampling resistor R1 to form a linear compensation circuit; the sensor measuring coil is connected with the signal collecting circuit board, two ends of the sensor measuring coil are connected with the measuring and collecting resistors R2, R4 and R3 which are connected in series to form a measuring and collecting loop, the thermistor R5 is connected in parallel with two ends of the resistor R3 to form the measuring and collecting loop with temperature compensation, the thermistor R5 is connected in parallel with the resistor R3 and then connected in series with the resistor R4 to form a voltage dividing circuit, and two ends of the voltage dividing circuit are used for outputting voltage to the measuring and collecting loop with temperature compensation; the voltage at the two ends of the current sampling resistor R1 of the linear compensation circuit is superposed with the output voltage of the measurement acquisition loop with temperature compensation to form a measurement output signal of the sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921814741.8U CN210774488U (en) | 2019-10-25 | 2019-10-25 | Signal compensation circuit of magnetoelastic sensor |
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| CN201921814741.8U CN210774488U (en) | 2019-10-25 | 2019-10-25 | Signal compensation circuit of magnetoelastic sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798152A (en) * | 2021-01-05 | 2021-05-14 | 上海工业自动化仪表研究院有限公司 | Magnetoelastic sensor with temperature compensation unit |
| CN113390475A (en) * | 2021-01-29 | 2021-09-14 | 张军虎 | Multifunctional metering module and rotary metering device |
| CN114924109A (en) * | 2022-07-20 | 2022-08-19 | 深圳市英特瑞半导体科技有限公司 | Method, circuit and device for testing low-power chip current |
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2019
- 2019-10-25 CN CN201921814741.8U patent/CN210774488U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798152A (en) * | 2021-01-05 | 2021-05-14 | 上海工业自动化仪表研究院有限公司 | Magnetoelastic sensor with temperature compensation unit |
| CN113390475A (en) * | 2021-01-29 | 2021-09-14 | 张军虎 | Multifunctional metering module and rotary metering device |
| CN113390475B (en) * | 2021-01-29 | 2024-07-09 | 杭州全仁电子科技有限公司 | Multifunctional metering module and rotary metering device |
| CN114924109A (en) * | 2022-07-20 | 2022-08-19 | 深圳市英特瑞半导体科技有限公司 | Method, circuit and device for testing low-power chip current |
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