A hysteresis model considering temperature effects for sintered NdFeB and its application in electromagnetic buffer

• The N52 demagnetization curve at different temperatures is obtained through experiments. • The experiments and simulation of electromagnetic buffer under intensive impact load are carried out. • The validated simulation model is used to further analyze other operating conditions. With the continuous expansion of the application field of sintered neodymium iron boron (NdFeB), its demagnetization behavior in specific devices deserves further attention. The systematic research on the demagnetization model of NdFeB and its application in specific devices was yet studied. To end this, a suite of tests was implemented to obtain the demagnetization curves at different temperatures of NdFeB. Referred to Jiles-Atherton (J-A) model, the hysteresis model used herein was fitted by the experimental data, so that a set of improved J-A model parameters for the tested materials was achieved. The model was further applied to the simulation calculation of electromagnetic buffer and the corresponding experimental research was also carried out. The simulation model was verified by comparing the electromagnetic buffering force and the buffering displacement obtained from both the simulations and experiments. The finite element model that had been verified by experiments was further applied to the calculation of more severe and complex working conditions. This article takes a specific application of sintered NdFeB as an example. Starting from the energy source, the influence of the nonlinearity of the sintered NdFeB hysteresis loop and temperature on the working process are fully considered. The calculation results of the simulation model provide a reference for the design of the electromagnetic buffer, and also provide ideas for the simulation and design of other electromagnetic devices