Abstract
The nonferromagnetic debris is easier to be detected as the excitation frequency increases; however, the sensitivity of ferromagnetic metal debris decreases as the excitation frequency increases. This paper is aimed at finding a range of excitation frequency that fit both ferromagnetic metal debris detection and nonferromagnetic metal debris detection. The equivalent circuit of the metal debris detection system with microinductor sensor is analyzed in this paper. The formulae of relationship between the sensitivity and excitation frequency are achieved according to the equivalent circuit. The simulation model of metal debris detection with the microsensor coil is built with the Ansoft software. The equivalent inductance and the electromagnetic induction field of the microinductor sensor are simulated as the excitation frequency changed. The experimental test is carried out with the prototype of microinductor sensor. The simulation results and the test results are compared. The studies indicate that the relationship between the excitation frequency and the changing rate of sensor inductance can be described by the fitting formulae. A higher sensitivity can be obtained if a suitable excitation frequency is selected. These researches have reference value for the design of inductor sensor and the parameters setting in the experimental test.
Highlights
Research shows that about 80 percent of mechanical faults are caused by the abrasion failure and the lubrication failure
The nonferromagnetic debris is easier to be detected as the excitation frequency increases; the sensitivity of ferromagnetic metal debris decreases as the excitation frequency increases
This paper studies the relationship between the excitation frequency and the changing rate of microcoil’s inductance based on the Kirchhoff principle and the theory of equivalent circuit
Summary
Research shows that about 80 percent of mechanical faults are caused by the abrasion failure and the lubrication failure. The inductance sensor was adopted to detect the metal debris in lubricant [9, 10]. The nonferromagnetic debris is easier to be detected as the excitation frequency increases; the sensitivity (inductance change rate) of ferromagnetic metal debris decreases as the excitation frequency increases. How to select the proper excitation frequency for the inductance sensor to detect two types of debris has not been researched. The simulation model of the metal debris test with micro-inductance sensor is built with the Ansoft software. The experimental test of metal debris with micro-inductance sensor is carried out. The excitation frequency, which makes the sensor a higher sensitivity, is selected based on the theory analysis, simulation result, and the experimental test
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