Calculating method for ultimate demagnetization temperature of loudspeaker magnetic steel

摘要

A calculating method for the demagnetization temperature of loudspeaker magnetic steel comprises the steps of: drawing a 2D or 3D geometric model view of the loudspeaker magnetic circuit system; importing performance parameters of the magnetic steel and designing variables to be solved and formulas; establishing a finite element model for magnetic loop system according to the imported performance parameters, variables and formulas; solving and conducting a steady-state analysis of the finite element model for a coordinate (Hn, Bn) on a BH curve, a loadline slope Pc value, and an ultimate demagnetization temperature; and obtaining a demagnetization curve. The parameters used may be remanence, remanence tolerance, temperature coefficient of remanence, intrinsic coercivity, intrinsic coercivity tolerance, temperature coefficient of coercivity, recoil permeability, and an inflection point gap parameter. The magnetic steel may be NdFeB or a ferrite.