US 11,996,752 B2
Transducer for producing vibrational movement
Nicholas Inoue, Bristol (GB)
Assigned to Groundwave LTD, London (GB)
Appl. No. 17/780,645
Filed by Groundwaves Ltd
PCT Filed Nov. 27, 2020, PCT No. PCT/EP2020/083776
§ 371(c)(1), (2) Date May 27, 2022,
PCT Pub. No. WO2021/105456, PCT Pub. Date Jun. 3, 2021.
Claims priority of application No. 1917525 (GB), filed on Nov. 29, 2019.
Prior Publication US 2023/0117699 A1, Apr. 20, 2023
Int. Cl. H02K 33/16 (2006.01); B06B 1/04 (2006.01); G08B 6/00 (2006.01); H02K 11/01 (2016.01)
CPC H02K 33/16 (2013.01) [B06B 1/045 (2013.01); G08B 6/00 (2013.01); H02K 11/0141 (2020.08)] 23 Claims
OG exemplary drawing
 
1. A transducer configured to convert electrical signals into vibrational movement, the transducer comprising:
an axially-magnetised reciprocating magnet magnetically suspended between first and second axially-magnetised stationary magnets located on opposing sides of the axially-magnetised reciprocating magnet, wherein the axially-magnetised reciprocating magnet comprises an aperture such that the reciprocating magnet has an inner boundary and an outer boundary; and
at least two pairs of concentrically positioned electromagnetic solenoids, the at least two pairs of concentrically positioned electromagnetic solenoids being configured to drive the reciprocating magnet to reciprocate in a volume between the first and second axially-magnetised stationary magnets,
wherein a first solenoid of each of the pairs of concentrically positioned electromagnetic solenoids is positioned to influence the reciprocating magnet at the inner boundary more than at the outer boundary, and a second solenoid of each of the pairs of concentrically positioned electromagnetic solenoids is positioned to influence the reciprocating magnet at the outer boundary more than at the inner boundary.