Vortex cooling of voice coils
AssigneeRobert Bosch GmbH
InventorAlan Babb
Life of this patent
Estimating the term…
Abstract
A low frequency transducer arrangement includes at least one substantially annular magnet. A voice coil is disposed within and concentric with the magnet. A pole is disposed within and concentric with the voice coil. An air gap is defined between the magnet and the pole. The pole includes a bottom half having a downwardly facing axial recess. A plurality of first air passages extend laterally from the axial recess and fluidly interconnect the recess and the air gap. A top half has an upwardly facing axial recess. A plurality of second air passages extend laterally from the upwardly facing axial recess and fluidly interconnect the upwardly facing recess and the air gap. The first air passages and/or the second air passages are non-radially oriented.
Claims19
A low frequency transducer arrangement comprising:
- at least one substantially annular magnet;
- a voice coil disposed within and concentric with the magnet;
- a pole disposed within and concentric with the voice coil, an air gap being defined between the magnet and the pole, the pole including:
- a bottom half having a downwardly facing axial recess, a plurality of first air passages extending laterally from the axial recess and fluidly interconnecting the recess and the air gap;
- and
- a top half having an upwardly facing axial recess, a plurality of second air passages extending laterally from the upwardly facing axial recess and fluidly interconnecting the upwardly facing recess and the air gap, wherein the first air passages and/or the second air passages are non-radially oriented.
A low frequency transducer arrangement comprising:
- an annular magnet;
- a voice coil disposed within and concentric with the magnet;
- a pole disposed within and concentric with the voice coil, a cylindrical air gap being defined between the magnet and the pole, the pole being at a substantially same vertical level as the magnet, the pole including an upwardly facing axial recess, a plurality of non-radially oriented first air passages extending laterally from the upwardly facing axial recess and fluidly interconnecting the upwardly facing recess and the air gap;
- and
- an annular steel ring disposed below and concentric with the magnet, the annular steel ring at least partially defining an outer boundary of the air gap, the steel ring including a plurality of non-radially oriented second air passages extending laterally from the air gap and fluidly interconnecting the air gap and ambient air.
A low frequency transducer arrangement comprising:
- two substantially annular and concentric magnets;
- a voice coil disposed within and concentric with at least an upper one of the magnets;
- a pole disposed within and concentric with the voice coil, an air gap being defined between the magnets and the pole, the pole including:
- a bottom half having a downwardly facing axial recess, a plurality of first air passages extending laterally from the axial recess and fluidly interconnecting the recess and the air gap, the bottom half being at a substantially same vertical level as a lower one of the magnets;
- and
- a top half having an upwardly facing axial recess, a plurality of second air passages extending laterally from the upwardly facing axial recess and fluidly interconnecting the upwardly facing recess and the air gap, wherein the first air passages and/or the second air passages are non-radially oriented, the top half being at a substantially same vertical level as the upper one of the magnets.
Dependencies are inferred from the claim text.