Structural Analysis of the Eddy Current Displacement Sensor for Magnetic Levitation Centrifugal Compressors

In the production process of magnetic levitation centrifugal compressors, due to the accumulation of tolerances, the axial sensor range is difficult to cover the tolerance band. Thus, it is necessary to increase the sensor range to cover the accumulated tolerance band. In this paper, the eddy-current sensor range is improved while the impact of the metal housing on the probe in the installation environment is taken into account. Through the simulation analysis of the eddy-current sensor and the metal housing, a counter hole needs to be added to the installation hole of the metal housing used to place the sensor. And the optimal structural shape is simulated synchronously. Finally, an experimental platform is built for product testing. And it has brought about a growth of the eddy-current sensor range from 1mm to 2mm.