The traditional analog eddy current sensors are prone to interference and complex circuit design issues,making the debugging of digital eddy current sensors using FPGA or CPLD software for measuring circuits and output signals complex.To address these issues,a digital eddy current sensor based on LDC1101 is designed to realize integration of carrier signal generation and measuring signal demodulation,and transmits measurement results to the controller via SPI communication.Each sensor module consists of an LDC1101 chip,an eddy current sensing coil,and a matching capacitor,greatly simplifying circuit design and difficulty of debugging.This sensor measurement method has been applied in the radial position measurement of rotor magnetic steel in bearingless permanent magnet motor suspension control.By employing 4 sensors mounted on the signal acquisition circuit board for differential measurement and calculating x and y positions of the rotor.Experimental results demonstrate this method has high resolution and good reliability.
eddy current sensorbearingless slice motorsuspension controlresolution
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