关键词: 线性可变差动变压器, 代理模型, 次级线圈, 线性度

Abstract: In order to meet the requirement for refinement and lightweight development of linear variable differential transformer( LVDT) , the design of secondary coil in high-length-diameter ratio LVDTs was conducted. A semi simulation proxy data model with axial partition method was proposed based on the finite element model, the mapping relationship between the structure parameters of LVDT’ s secondary coils and the distribution of nonlinearity error of the output signal
was established. The influence of the secondary coils’ arrangement on the distribution of nonlinearity error was investigated and the design method to improve the linearity of the output signal was suggested. The accuracy of the semi simulation proxy data model and the feasibility of the optimization method for the secondary coil was verified by the finite element method. The results indicated that, without any change on the external dimensions or the number of the internal components of the LVDT, the maximum nonlinearity error within the whole travel range of the LVDT was reduced to 0. 262%, which was only 19. 1% of the maximum error value in the original one, and the utility of thus high-length-diameter ratio LVDTs was enhanced.

Key words: linear variable differential transformer( LVDT), proxy data model, secondary coil, linearity