Driver Circuit Design for a New Eddy Current Sensor in Displacement Measurement of Active Magnetic Bearing Systems

Position sensing is one of the crucial parts active magnetic bearing (AMB) system. The printed circuit board (PCB) eddy current position sensor a new type for AMB system, which makes compact structure, high quality, and low cost. In this article, an improved driver proposed sensor. includes excitation signal conditioning circuits. A crystal oscillator with power stage used to provide coil stable source stability good precision frequency. analog demodulation designed circuits extract rotor displacement information from outputs. Compared state-of-art schemes, method reduces complexity Accordingly, experimental results show that has linearity sensitivity, it can ensure operation at rated speed.