Electroacoustic analysis, design, and implementation of a small balanced armature speaker

Abstract

This paper presents a new design and implementation of a balanced armature speaker (BAS), which is composed of permanent magnetic circuits, a moving armature, and a coil. The armature rocks about a pivot with the coil at one end and the permanent magnet on another. A magnetic circuit analysis is conducted for the designed BAS to formulate the force factor, which is required for modeling the coupling between the electrical and mechanical systems. In addition, an electromechanoacoustical analogous circuit is established for the BAS, which bears the same structure as the moving coil loudspeaker, except that the force factor is different. A hybrid model, which combines the lumped parameter model in the electrical and acoustical domains with a finite element model in the mechanical domain, is developed to model the high-frequency response because of the high-order modes of the membrane, the drive rod, and the armature. The electroacoustic analysis is experimentally verified. The results indicate that the sound pressure response that is simulated using the hybrid model is in superior agreement with the measured response to that simulated using the lumped parameter model.

Design and analysis of piezoelectric MEMS micro‐speaker based on scandium‐doped AlN thin film

“…Coil position and compliance depend on the membrane. While conventional electrodynamic speakers are mainly employed in lower priced products, balanced armature speakers are more targeted at high fidelity in-ear applications as well as wireless systems [13][14][15][16][17]. Initially designed for hearing aids, these speakers feature higher energy efficiency and are capable of delivering good acoustic performance at relatively small device dimension.…”

Comparison of Multi-Physical Coupling Analysis of a Balanced Armature Receiver between the Lumped Parameter Method and the Finite Element/Boundary Element Method

“…In terms of acoustic transducers, there are the MEMS receiver [1,2], the dynamic receiver [3], the speaker box with passive radiator [4], and the balanced armature receiver [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The Balance armature structure was devized by Olsen [5].…”