Design and analysis of axial-radial transverse flux sensors

Displacement sensor is one of the important components in the high-speed magnetic bearing system, which directly influences the control accuracy. Traditional magnetic bearing systems rely on multiple eddy current sensors with high displacement measurement costs and low integration. To address this issue, this paper proposes a transverse flux displacement sensor based on printed circuit boards (PCB). This sensor integrates three axial-radial degrees of freedom measurement within a single compact structure, demonstrating sensitivity of 5V/mm in axial direction and 4V/mm in radial direction with linearity errors below 3% across all measurement axes. Through experimental validation, the coupling between axial and radial directions was measured at 47%, which was subsequently reduced to below 13% via the decoupling method. The integration of these performance metrics highlights the sensor’s advantages of good sensitivity, compact size, and cost-effectiveness compared to traditional multi-sensor configurations.