Aiming at the characteristic that it is difficult to measure the displacement in constant-voltage control electrostatic suspension system with eight electrodes

a kind of displacement sensor circuit is designed.The working principle of the four axis displacement sensor is analyzed.The method which ensures the rotor ground potential is given.The system sensitivity of four axis non-orthogonal displacement measurement is analyzed.The circuit of displacement sensor is designed.The circuit of separating displacement signal from the bearing high-voltage are designed.Test results show that the displacement sensor can measure displacement of the rotor accurately and improves measurement precision to a certain extent and meets the design requirements.It also provides a reliable guarantee for displacement measurement in electrostatic suspension system with eight electrodes.