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A wide linear range Eddy Current Displacement Sensor equipped with dual-coil probe applied in the Magnetic Suspension Flywheel.

Fang J, Wen T - Sensors (Basel) (2012)

Bottom Line: The Eddy Current Displacement Sensor (ECDS) is widely used in the Magnetic Suspension Flywheel (MSFW) to measure the tiny clearance between the rotor and the magnetic bearings.Wide clearances must be measured in some new MSFWs recently designed for the different space missions, but the coil diameter is limited by some restrictions.The effectiveness of the linear range extension ability and the dynamic response of the designed ECDS are confirmed by the testing and the applications in the MSFW.

View Article: PubMed Central - PubMed

Affiliation: Science and Technology on Inertial Laboratory, School of Instrumentation Science and Opto-Electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China. fangjiancheng@buaa.edu.cn

ABSTRACT
The Eddy Current Displacement Sensor (ECDS) is widely used in the Magnetic Suspension Flywheel (MSFW) to measure the tiny clearance between the rotor and the magnetic bearings. The linear range of the ECDS is determined by the diameter of its probe coil. Wide clearances must be measured in some new MSFWs recently designed for the different space missions, but the coil diameter is limited by some restrictions. In this paper, a multi-channel ECDS equipped with dual-coil probes is proposed to extend the linear range to satisfy the demands of such MSFWs. In order to determine the best configuration of the dual-coil probe, the quality factors of the potential types of the dual-coil probes, the induced eddy current and the magnetic intensity on the surface of the measuring object are compared with those of the conventional single-coil probe. The linear range of the ECDS equipped with the selected dual-coil probe is extended from 1.1 mm to 2.4 mm under the restrictions without adding any cost for additional compensation circuits or expensive coil materials. The effectiveness of the linear range extension ability and the dynamic response of the designed ECDS are confirmed by the testing and the applications in the MSFW.

No MeSH data available.


Related in: MedlinePlus

The simulation model and the mesh grids of the probe and measuring object used for FEM analysis.
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f9-sensors-12-10693: The simulation model and the mesh grids of the probe and measuring object used for FEM analysis.

Mentions: As shown in Figure 9, it is the FEM model and mesh grids of the probes and the measuring object. The distance from the probe to the measuring object is 1.2 mm. It is known from the Figure 8(c) that the best exciting current frequency in the coil is 800 kHz. It is supposed that the pk-pk value of the exacting current in each coil is Ic = 1 mA.


A wide linear range Eddy Current Displacement Sensor equipped with dual-coil probe applied in the Magnetic Suspension Flywheel.

Fang J, Wen T - Sensors (Basel) (2012)

The simulation model and the mesh grids of the probe and measuring object used for FEM analysis.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3472851&req=5

f9-sensors-12-10693: The simulation model and the mesh grids of the probe and measuring object used for FEM analysis.
Mentions: As shown in Figure 9, it is the FEM model and mesh grids of the probes and the measuring object. The distance from the probe to the measuring object is 1.2 mm. It is known from the Figure 8(c) that the best exciting current frequency in the coil is 800 kHz. It is supposed that the pk-pk value of the exacting current in each coil is Ic = 1 mA.

Bottom Line: The Eddy Current Displacement Sensor (ECDS) is widely used in the Magnetic Suspension Flywheel (MSFW) to measure the tiny clearance between the rotor and the magnetic bearings.Wide clearances must be measured in some new MSFWs recently designed for the different space missions, but the coil diameter is limited by some restrictions.The effectiveness of the linear range extension ability and the dynamic response of the designed ECDS are confirmed by the testing and the applications in the MSFW.

View Article: PubMed Central - PubMed

Affiliation: Science and Technology on Inertial Laboratory, School of Instrumentation Science and Opto-Electronics Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China. fangjiancheng@buaa.edu.cn

ABSTRACT
The Eddy Current Displacement Sensor (ECDS) is widely used in the Magnetic Suspension Flywheel (MSFW) to measure the tiny clearance between the rotor and the magnetic bearings. The linear range of the ECDS is determined by the diameter of its probe coil. Wide clearances must be measured in some new MSFWs recently designed for the different space missions, but the coil diameter is limited by some restrictions. In this paper, a multi-channel ECDS equipped with dual-coil probes is proposed to extend the linear range to satisfy the demands of such MSFWs. In order to determine the best configuration of the dual-coil probe, the quality factors of the potential types of the dual-coil probes, the induced eddy current and the magnetic intensity on the surface of the measuring object are compared with those of the conventional single-coil probe. The linear range of the ECDS equipped with the selected dual-coil probe is extended from 1.1 mm to 2.4 mm under the restrictions without adding any cost for additional compensation circuits or expensive coil materials. The effectiveness of the linear range extension ability and the dynamic response of the designed ECDS are confirmed by the testing and the applications in the MSFW.

No MeSH data available.


Related in: MedlinePlus