关键词: 线性可变差动变压器, 锥形末端, 线性度, 灵敏度, Maxwell

Abstract: The linear variable differential transformer (LVDT) type displacement transducer has the advantages of high reliability and non-contact measurement, and it is widely used in the closed-loop control system to collect the displacement signal. The uneven distribution of internal magnetic field leads to the disadvantage of poor linearity and low sensitivity of traditional LVDT, which must be used with external conditioning circuit. The end of movable iron core was designed with a certain taper, and the LVDT finite element model was established by ANSYS Maxwell. The LVDT external excitation circuit was designed by Simplorer, and the electromagnetic joint simulation of the transient magnetic field was carried out. The simulation results show that the design of the iron core end with a certain taper can improve the linearity and sensitivity of LVDT. Compared with the traditional LVDT, the linearity of new LVDT was increased by 1.5 times and the sensitivity was improved by 10 mV/mm. The feasibility of the scheme was verified by setting up a test platform.

Key words: linear variable differential transformer (LVDT), cone-shaped end, linearity, sensitivity, Maxwell