Forum Acusticum 2026

Force Cancellation Motor

FA2026/112

10 Sept 2026, 10:40

20m

Saal 4 (Messe Congress Graz)

A01 Active Control of Sound and Vibration A01.04 Active Sound and Vibration Control

Speaker

Friedrich Reining (Sound Solutions Austria GmbH)

Description

This paper presents the Force Cancellation Motor (FCM), a microspeaker concept designed to reduce vibrations in ultra‑thin mobile devices without increasing module height. FCM integrates a compact actuator into the speaker’s center magnet, enabling active vibration suppression based on the known excitation signal while remaining independent of acoustic output. Prototype measurements show strong vibration reduction in perceptually relevant low‑frequency ranges and a 71% power‑efficiency improvement over a height‑optimized dual‑woofer reference. Additional benefits include optional activation of the compensation feature and the actuator’s use as a haptic driver, making FCM a promising solution for space‑constrained audio systems.

Presentation materials

Full paper (PDF)