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Constant magnetic-field intensity control system of electromagnetic flowmeter and method

A technology of electromagnetic flowmeter and magnetic field strength, which is applied in the direction of measuring flow/mass flow, liquid/fluid solid measurement, measuring device, etc. It can solve problems such as poor stability of magnetic field strength B, and achieve the effect of stable detection accuracy.

Inactive Publication Date: 2018-11-30
SHAOXING UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of poor stability of the magnetic field strength B produced by the AC excitation technology in the above-mentioned prior art, the present invention provides a constant magnetic field strength control system for electromagnetic flow, which ensures the stability of the magnetic field strength of the electromagnetic flowmeter during long-term use

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  • Constant magnetic-field intensity control system of electromagnetic flowmeter and method

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Embodiment 1

[0021] A constant magnetic field intensity control system of an electromagnetic flowmeter includes a central processing unit, a signal processing unit, a magnetic field detection sensor, an excitation coil, a power drive circuit and an AGC self-gain controller. The central processing unit includes a DA DC voltage chip and a sinusoidal signal generator, the sinusoidal signal generator is used to provide the sinusoidal voltage signal, and the DA DC voltage chip is used to provide the DC voltage signal. The central processing unit is provided with a sinusoidal signal output terminal and a DC voltage signal output terminal for outputting a sinusoidal signal and a DC voltage given signal respectively. The DC voltage given by the DA DC voltage chip in the CPU is the normal voltage value under the assumption that the electromagnetic flowmeter is stable.

[0022] The signal processing unit includes a signal conditioning circuit and an effective value conversion circuit arranged and co...

Embodiment 2

[0030] This embodiment provides a constant magnetic field strength control method for an electromagnetic flowmeter, including the following steps:

[0031] S1. Place the magnetic field detection sensor anywhere in the magnetic field generated by the electromagnetic flowmeter;

[0032] S2. Turn on the electromagnetic flowmeter, the magnetic field detection sensor detects the magnetic field strength B1 and its detection data is processed into a DC voltage signal and input to the AGC self-gain controller;

[0033] S3.; The central processing unit outputs a DC voltage given signal and a sinusoidal voltage signal to the AGC self-gain controller according to the set magnetic field strength;

[0034] S4: AGC self-gain controller automatically adjusts the gain amplification factor of the sinusoidal voltage signal according to the input DC voltage signal and standard signal;

[0035] S5. The power drive circuit controls and drives the excitation coil to generate a magnetic field corre...

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Abstract

The invention provides a constant magnetic-field intensity control system of an electromagnetic flowmeter and a method and belongs to the field of flow detection. The system comprises a central processing unit (CPU), a signal processing unit, a magnetic field detection sensor, an excitation coil, a power driving circuit and an AGC (Automatic Gain Control). According to the system and the method, aworking magnetic field of the electromagnetic flowmeter can be stable through comparing given magnetic-field intensity with magnetic-field intensity detected by the magnetic field detection sensor inreal time and controlling the power driving circuit to adjust the magnetic-field intensity through operating, so that the accuracy of detection of the electromagnetic flowmeter is ensured.

Description

technical field [0001] The invention relates to the field of flow detection, in particular to a constant magnetic field strength control system and method for an electromagnetic flowmeter. Background technique [0002] Electromagnetic flowmeter is a flow detection device based on Faraday's law of electromagnetic induction. Its principle is: when a conductor moves in a magnetic field and cuts the magnetic force line, the induced electromotive force E generated by the conductor and the magnetic field strength B, the conductor moving speed V and the conductor cutting the magnetic force line It is proportional to the effective length D, and the flow rate of the conductive fluid is inferred by fixing the amount B, D and combining the detected E value. [0003] In the prior art, the electromagnetic flow must use AC excitation technology to generate a magnetic field. The AC excitation technology mainly uses constant current control to stabilize the magnetic field strength B. Howe...

Claims

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Application Information

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IPC IPC(8): G01F1/60
Inventor 梁伟陈坤
Owner SHAOXING UNIVERSITY