Design of eddy-current transducers for linear displacements with periodic output characteristics

1989 ◽  
Vol 22 (3) ◽  
pp. 183
Author(s):  
D.S. Kostrov ◽  
Y.I. Steblev
Keyword(s):  
Eddy Current ◽  
Output Characteristics

Effect of Conformable Substrate Thickness on an Eddy Current Sensor Array’s Output Characteristics

2011 ◽  
Vol 335-336 ◽  
pp. 1503-1507
Author(s):  
Jin Qiang Du ◽  
Yu Ting He ◽  
Hua Ding ◽  
Hai Wei Zhang ◽  
Li Ming Wu
Keyword(s):  
Finite Element ◽  
Eddy Current ◽  
Sensor Array ◽  
Element Model ◽  
Current Sensor ◽  
Substrate Thickness ◽  
Eddy Current Sensor ◽  
Sensor Fabrication ◽  
Output Characteristics ◽  
Couple Method

A finite element model of an eddy current sensor array is built up by electromagnetic-circuit couple method, and the influences of conformable substrate thickness on sensor’s output characteristics are analyzed by the model. It is shown that the amplitude of sensing coils’ output would diminish as substrate thickness increased, besides, the discrepancies of sensing coils’ output also decrease when the substrate becoming thicker. Therefore tt is necessary to make the conformable substrate as thin as possible in sensor fabrication process to enhance the crack inspecting ability of the sensor.

Simulation Analysis of Conformable Substrate on an Eddy Current Sensor Array’s Output Characteristics Based on Finite Element Method

2011 ◽  
Vol 130-134 ◽  
pp. 2724-2728
Author(s):  
Jin Qiang Du ◽  
Yu Ting He ◽  
Hua Ding ◽  
Li Ming Wu ◽  
Qing Shao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Eddy Current ◽  
Sensor Array ◽  
Simulation Analysis ◽  
Current Sensor ◽  
Finite Element Models ◽  
Eddy Current Sensor ◽  
Output Characteristics ◽  
Couple Method

Finite element models of an eddy current sensor array are built up by electromagnetic-circuit couple method, and the influences of conformable substrate on sensor’s output characteristics are analyzed by those models. It is shown that the model contains the conformable substrate has almost the same output characteristics as the model without it, but the output amplitudes and phases of the former model are higher than the latter. Therefore we can simply the sensor as a single surface to facilitate the analysis, and then revise it to fit to the real sensor.

scholarly journals Study on Multi-DOF Actuator for Improving Power Density

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4204
Author(s):  
Sooyoung Cho ◽  
Ho Joon Lee ◽  
Ju Lee
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stability Analysis ◽  
Low Power ◽  
Power Density ◽  
Eddy Current ◽  
Pitch Angle ◽  
Eddy Current Loss ◽  
Element Analysis ◽  
Output Characteristics

This study focuses on improving the power density of a spherical multi-degree-of-freedom (multi-DOF) actuator. A spherical multi-DOF actuator that can operate in three DOFs is designed. The actuator features a double air gap to reduce eddy current loss. However, a multi-DOF actuator driven by a single actuator exhibits low power density. Therefore, a Halbach magnet array is applied to improve the power density of a spherical multi-DOF actuator, and its output characteristics are compared with those of an existing spherical multi-DOF actuator via finite element analysis. Additionally, the output characteristics are analyzed based on changes in the coil pitch angle and magneto-motive force of the rotating winding. Furthermore, it is necessary for a spherical multi-DOF actuator to move to the command position. Hence, a stability analysis is performed to ensure that the spherical multi-DOF actuator is stably driven based on the command position.

scholarly journals Circuit Coupling Model Containing Equivalent Eddy Current Loss Impedance for Wireless Power Transfer in Seawater

2021 ◽  
Vol 15 ◽  
pp. 410-416
Author(s):  
Wangqiang Niu ◽  
Chen Ye ◽  
Wei Gu
Keyword(s):  
Eddy Current ◽  
Wireless Power Transfer ◽  
Coupling Model ◽  
Eddy Current Loss ◽  
Outer Diameter ◽  
Water Medium ◽  
Power Transfer ◽  
Wireless Power ◽  
Current Loss ◽  
Output Characteristics

Nowadays, as the whole world put more emphasis on ocean resource exploration, the use of automatic underwater vehicles (UAVs) comes to be increasingly frequent. Inductive wireless power transfer (IWPT), as a power transfer solution with high safety and exibility, is quite promising applied in UAV power supply. However, when applied underwater, IWPT efficiency decreases due to eddy current loss (ECL) caused by high conductivity of water medium. In order to analyze IWPT output characteristics in seawater, this paper proposes a coupling circuit model involving equivalent eddy current loss impedance (EECLI), which is derived via three- coil model. On the one hand, it is found that splitting frequency still exists in IWPT under seawater. On the other hand, EECLI is independent to coil distance, but proportional to operation frequency. The validity of the proposed model for IWPT system with coils in small size (coil outer diameter 12 cm, system resonant fre- quency 570 kHz) is verified by experiment, which means it is available for IWPT system design and analysis.

Simulation Analysis of an Eddy Current Sensor Array Based on Finite Element Method

2011 ◽  
Vol 299-300 ◽  
pp. 1072-1077
Author(s):  
Jin Qiang Du ◽  
Yu Ting He ◽  
Hua Ding ◽  
Hai Wei Zhang ◽  
Li Ming Wu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Eddy Current ◽  
Sensor Array ◽  
Simulation Analysis ◽  
Element Model ◽  
Current Sensor ◽  
Eddy Current Sensor ◽  
Output Characteristics ◽  
Couple Method

A finite element model of an eddy current sensor array is built up by electromagnetic-circuit couple method, and the influences of crack length and frequency on sensor’s output characteristics are analyzed by this model. It is shown that the model established in this paper is reasonable. There would be a change on amplitude and phase when a crack appears below the footprint of sensing coil in metal plane, and the amplitude and phase of sensor coil are increasing gradually as crack propagation. As frequency increased, the differences between the sensing coils’ output become obvious. However, the differences begin decreasing while the frequency above 3MHz approximately. These results will provide a reference for further research and application of the sensor.

Research on Output Characteristics of Piezoelectric Accelerometers for Low-Frequency Vibration

2010 ◽  
Vol 139-141 ◽  
pp. 2460-2463
Author(s):  
Chao Fu Zhu ◽  
Xu Qin ◽  
Li Wen Zheng
Keyword(s):  
Eddy Current ◽  
High Frequency ◽  
Low Frequency ◽  
Vibration Measurement ◽  
Current Sensor ◽  
Vibration Frequencies ◽  
High Frequency Vibration ◽  
Eddy Current Sensor ◽  
Low Frequency Vibration ◽  
Output Characteristics

Piezoelectric accelerometers are widely used for the measurement of middle- or high-frequency vibration. It is necessary to verify via experiments whether piezoelectric accelerometers can accurately measure low-frequency vibration. An experiment is designed to test the output characteristics of piezoelectric accelerometers for vibration of 1~5 Hz frequency, using a standard vibrator at low frequency (≤5Hz) and an accurately calibrated non-contact eddy current sensor as datum sensor. The experiment shows that the output characteristics of piezoelectric accelerometers are relatively stable when measuring vibration of 4~5Hz frequency. However, the output characteristics of accelerometers change with the frequencies and accelerations of vibration when the vibration frequencies are 1~3 Hz. It will affect the accuracy of vibration measurement.

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