Design of Eddy Current Displacement Sensors for Maglev System of Ventricular Assist Device

Noncontact eddy current displacement sensor was designed for the Maglev system of the ventricle assist device(VAD).With regard to the special structure in which there was a titanium alloy frame between the displacement sensor and VAD ' s rotor,this paper analyzed the sensor magnetic field by using finite element method to obtain structural parameters of sensor,built a device to monitor coil winding for improving the impedance consistency.Performance test of sensor coils shows that the standard deviation of sensor coils is 3.8%,the sensitivity is higher than 10%,and the good properties are feasible for the Maglev system of VAD.