Static analysis of a balanced armature receiver

• Published in: Compel Vol. 37; no. 4; pp. 1392 - 1404
• Main Authors: Ziolkowski, Marcin, Kwiatkowski, Wojciech, Gratkowski, Stanislaw, Ziolkowski, Marek
• Format: Journal Article
• Language: English
• Published: Bradford Emerald Publishing Limited 16.10.2018; Emerald Group Publishing Limited
• Subjects: Acoustic noise; Active noise control; Electric currents; Finite element method; Hearing aids; Magnetic fields; Magnetism; Mathematical models; Music; Noise control; Permeability; Pneumatics; Position measurement; Transducers; Two dimensional models; Finite element method; Electromechanical transducers; Lumped network approach; Electromagnetic acoustic transducer; Balanced armature receiver
• ISSN: 0332-1649; 2054-5606
• DOI: 10.1108/COMPEL-09-2017-0376

Purpose A balanced armature receiver (BAR) as a special type of electromagnetic acoustic transducers plays a significant role in reproduction of music and speech, active noise control in modern hearing aid and in contemporary in-ear monitors. This paper aims to present a static analysis of the balanced armature receiver based on the lumped network approach (LNA) and the finite element method (FEM). Design/methodology/approach In this paper, the LNA and two-dimensional FEM are applied to model deflections of the BAR’s armature from the equilibrium position. Results of calculations are compared with measurements. Findings The derived analytical formulas and developed procedure allow for calculation of the armature deflection. Originality/value Comparing to the previous papers, the reluctance’s nonlinearity of the armature has been considered.