Research on the Influence of Excitation Frequency on the Sensitivity in Metal Debris Detection with Inductor Sensor

Liu, Bendong; Zhang, Fangzhou; Li, Desheng; Yang, Jiahui

doi:10.1155/2014/790615

Cited by 8 publications

(8 citation statements)

References 12 publications

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“…2. The detection model adopts a symmetrical reverse double-coil structure and uses a magnetically inert material that is not affected by magnetic field energy as the skeleton of the coil [30]. It includes two sets of reverse winding excitation coils and one set of induction coils.…”

Section: Online Symmetric Magnetic Excitation Monitoring Sensor For Metal Wear Debrismentioning

confidence: 99%

Online Symmetric Magnetic Excitation Monitoring Sensor for Metal Wear Debris

Bai

et al. 2022

IEEE Sensors J.

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The metal wear debris in mechanical transmission can feedback the characteristics of mechanical equipment failure, and its online monitoring efficacy directly affects the operating performance of mechanical equipment. Specific to the need for online fault detection of the mechanical transmission system, a double-coil reverse excitation method is adopted to provide a magnetic field environment for metal wear debris testing in the lubricating oil circuit of the mechanical transmission system. Based on the magnetic field distribution model of a single-coil solenoids, a coupling magnetic field distribution model of reverse-symmetric double-coil magnetic excitation is established. On the basis of detecting the coils to obtain the signals of magnetic field disturbance when metal water debris passing through the magnetic excitation field, an online monitoring sensor for metal wear debris with a reverse-symmetric double-coil magnetic excitation balance magnetic field is developed. Taking the monitoring of metal wear debris in a large-aperture flow channel as an example, a semi-physical simulation test has been carried out on metal wear debris in different grain diameters and textures, whose experimental results indicate that this sensor can detect 100 μm ferromagnetic metal and 1000 μm non-ferromagnetic metal in an 8 mm flow channel, which, as a detection sensor for metal wear debris, can also be used for metal wear debris monitoring in the mechanical lubricants of mechanical transmission and engines.

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Section: Online Symmetric Magnetic Excitation Monitoring Sensor For Metal Wear Debrismentioning

confidence: 99%

Online Symmetric Magnetic Excitation Monitoring Sensor for Metal Wear Debris

Bai

et al. 2022

IEEE Sensors J.

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“…Additionally, results obtained by the solenoid coil sensor [ 24 ] indicated that its sensitivity to ferrous and non-ferrous metal debris in the inner diameter of the pipe, which was approximate 43 mm, could be achieved with values of 70 µm (diameter) and 165 µm, respectively. Liu et al [ 25 ] investigated the relationship between the excitation frequency of the microinductor sensors and the rate of change of the sensor inductance. The sensitivity of ferrous metal debris decreased with the increasing excitation frequency, while the sensitivity of non-ferrous metal debris increased with the excitation frequency.…”

Section: Introductionmentioning

confidence: 99%

On the Investigation of Frequency Characteristics of a Novel Inductive Debris Sensor

Liu

Qian

et al. 2023

Micromachines

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Lubricants have the ability to reduce frictions, prevent wear, convey metal debris particles and increase the efficiency of heat transfer; therefore, they have been widely used in mechanical systems. To assess the safety and reliability of the machine under operational conditions, the development of inductive debris sensors for the online monitoring of debris particles in lubricants has received more attention from researchers. To achieve a high-precision, high-efficiency sensor for accurate prediction on the degree of wear, the equivalent circuit model of the sensor coil has been established, and its equations discovering the relationship between the induced voltage and excitation frequency have been derived. Furthermore, the influence of excitation frequencies and metal debris on the magnetic flux density has been analyzed throughout the simulations to determine the sensor magnetic field. In order to identify a frequency range suitable for detecting both ferrous and non-ferrous materials with a high level of sensitivity, the analytical analysis and experiments have been conducted to investigate the frequency characteristics of the developed inductive debris sensor prototype and its improved inspection capability. Moreover, the developed inductive debris sensor with the noticeable frequency characteristics has been assessed and its theoretical model has been also validated throughout experimental tests. Results have shown that the detection sensitivity of non-ferrous debris by the developed sensor increases with the excitation frequency in the range of 50 kHz to 250 kHz, while more complex results for the detection of ferrous debris have been observed. The detection sensitivity decreases as the excitation frequency increases from 50 kHz to 300 kHz, and then increases with the excitation frequency from 300 kHz to 370 kHz. This leads to the effective selection of the excitation frequency in the process of inspection. In summary, the investigation into the frequency characteristics of the proposed novel inductive debris sensor has enabled its broad applications and also provided a theoretical basis and valuable insights into the development of inductive debris sensors with improved detection sensitivity.

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“…Wear debris flowing along lubrication systems can potentially rub against the surface of friction pairs and clog flow channels, resulting in severe damage to machines, especially to sensitive and critical parts. According to the research, abrasion and lubrication failures occupy approximately 80% of mechanical faults [1,2]. Thus, effective condition monitoring technologies are necessary for the timely prevention of machinery faults and unwanted production delays.…”

Section: Introductionmentioning

confidence: 99%

“…Combining the inductance and the resistance methods, the planar coil with 20 turns can detect 55 µm iron particles and 115 µm copper particles. Liu analyzed the relationship between sensitivity and excitation frequency and concluded that high sensitivity can be obtained if suitable excitation frequency is chosen [1]. Ren proposed an effective signal processing system with an unbalance compensation module to reduce the effects on sensitivity due to coil asymmetry [19].…”

Section: Introductionmentioning

confidence: 99%

Interference reducing by low-voltage excitation for a debris sensor with triple-coil structure

Qian¹,

Ren²,

Feng³

2019

Meas. Sci. Technol.

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Dielectric impurities, such as air bubbles and water droplets, which flow along lubrication systems can severely interfere with the performance of inductive debris sensors due to coil parasitic capacitances. This study proposes a novel triple-coil debris sensor with low voltage excitation to reduce the influence of variations in coil parasitic parameters and to improve the resistance to interference of dielectric impurities without sacrificing sensitivity to metallic particles. The sensor utilizes a 3-turn excitation coil made of Litz wire and two identical 60-turn sensing coils made of enameled wire. A sensor prototype with a compact and efficient signal processing system is constructed and several experiments are conducted to test its performance. Results show that the sensor can successfully detect 300 µm (diameter or D) high-carbon steel particles, 558 µm (D) copper particles, and 491 µm (D) aluminum particles in an oil pipe with an outer diameter of 50 mm. Comparative experiments indicate that for the sensor with conventional excitation method, the amplitude of the interference induced by an 8.5 mm (D) water droplet is equivalent to that of the interference induced by a 524 µm (D) ferrous particle, and a 10 mm (D) air bubble may be mistaken as a 557 µm (D) ferrous particle. No interference occurs under the same conditions for the sensor with low voltage excitation.

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Research on the Influence of Excitation Frequency on the Sensitivity in Metal Debris Detection with Inductor Sensor

Cited by 8 publications

References 12 publications

Online Symmetric Magnetic Excitation Monitoring Sensor for Metal Wear Debris

Online Symmetric Magnetic Excitation Monitoring Sensor for Metal Wear Debris

On the Investigation of Frequency Characteristics of a Novel Inductive Debris Sensor

Interference reducing by low-voltage excitation for a debris sensor with triple-coil structure

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