Mandrel for a coil transducer motor structure

摘要

The invention relates to a mandrel (21) for a coil transducer motor structure (10) adapted to receive at least one coil (22H, 22L) wound therearound arranged in use for displacing the mandrel (21) along an axis of displacement Z, as a current is driven through the coils (22H, 22L) when the mandrel (21) is placed in a magnetic field, characterized in that the mandrel (21) has a monobloc structure with a natural mechanical mode of vibration outside of the audible frequency range.