An AC Current Source for Exciting an Inductive Sensor

Abstract

The invention relates to an AC current source for exciting an inductive sensor, which includes a sine wave generator based on FPGA, and the output terminal of the sine wave generator based on FPGA outputs two-way sine-wave signals and four-way pulse signals, and two-way sine wave signals The wave signal is input to the waveform amplifier, and after amplification, it is input into the drive circuit and the drive circuit transmits the excitation signal to the inductive sensor; the four-way pulse signal output by the sine wave generator is input to the sensor acquisition circuit as a reference clock; the FPGA-based sine wave generator includes The FPGA chip, the output ends of the FPGA chip are respectively connected to the DA converter through the SPI bus, and the output ends of the DA converter are connected to the low-pass filter. The invention adopts the alternating current signal to excite the inductive sensor coil, which can effectively improve the measurement accuracy of the inductive sensor, improve the anti-interference degree of the current excitation signal, and increase the transmission distance at the same time. The invention can be widely applied in the field of on-line monitoring of lubricating oil of various mechanical equipment.

Description

technical field [0001] The invention relates to an alternating current source, in particular to an alternating current source for exciting an inductive sensor used for on-line monitoring of mechanical equipment lubricating oil. Background technique [0002] Lubricating oil is an indispensable part in the operation of many mechanical equipment. During the long-term operation of the machine, the wear and tear of mechanical parts always exists. Wear is the main reason that affects the service life and reliability of mechanical equipment. About 80% of equipment failures are caused by mechanical wear, and the economic loss caused by abrasive wear is the most serious. After long-term operation of mechanical equipment, the fine abrasive particles produced by wear and tear will gradually contaminate the lubricating oil and reduce the lubricating effect. It will cause mechanical failure and even cause accidents. For large or super-large mechanical equipment, many of them are in the...

AI Technical Summary

Problems solved by technology

Since the sensor is installed in the pipeline of mechanical equipment, the transmission cable of the excitation signal is generally relatively long, with a length of 3 to 15 meters. If the voltage signal is used for transmission, it is easy to be subjected to electromagnetic interference during the transmission process, which eventually leads to the excitation coil. The excitation magnetic field changes

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