Research On Key Technology Of Suspend Gap Sensor For Maglev Vehicle

The object of the research is the Suspension Sensor . On the basis of advanced foreign technology for reference, we developed the sensor independently, which makes significant practice for learning the advanced technology.Suspension Sensor is used for measuring the operating parameters, including gap, velocity, acceleration and temperature, and transmit the results to the control unit. The sensors are composed of body case, coil card and signal processing board. Gap and velocity are measured by utilizing electric eddy current effect. The alteration of the position between coil card and trail will result in the changes of the intensity and distribution of eddy current. The position will be decided by detecting the sort of changing. The measurement for acceleration is performed by the special accelerator that has the advantage of high speed, high precision, easily mounting and good reliability. We used the platinum thermal resistor as temperature sensitive element, which is used as a adjustable parameter for ring multivibrator. The method simplified the design and adjust of the circuit.As to the digital design, we used the prevailing device-Field Programmable Gate Array(FPGA). The software design and validation is performed by Verilog HDL, by which improved the developing efficiency.