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.
Highlights
The magnetic suspension flywheel (MSFW), whose rotor is suspended by magnetic bearings (MB)is regarded as the most promising attitude actuator for ultra-high precision satellites [1,2]
In order to satisfy the requirement of the large gap measurement of the MSFW with the three limitations mentioned above, in this paper a dual-coil probe which could extend the linear range of the eddy current displacement sensor (ECDS) is introduced without any additional cost of more compensation circuits or expensive coil materials
A multi-channel ECDS equipped with a dual-coil probe has been introduced in this paper to satisfy the need for wide gap measuring of the G-MSFW and APH-MSFW within the strict limitations of the coil diameter and complexity of the circuit
Summary
The magnetic suspension flywheel (MSFW), whose rotor is suspended by magnetic bearings (MB). The linear range of the ECDS could be extended by increasing the diameter of the probe coil [8]. The linear range of the ECDS is determined by the quality factor (Q-factor) of the probe coil and the induced eddy current density on the surface of the measuring object [11]. In order to satisfy the requirement of the large gap measurement of the MSFW with the three limitations mentioned above, in this paper a dual-coil probe which could extend the linear range of the ECDS is introduced without any additional cost of more compensation circuits or expensive coil materials.
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