Vortex cooling of voice coils
US8577074B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 14, 2011 |
| Grant date | Nov 5, 2013 |
| Priority date | — |
| Expiry date | Jul 12, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R9/022
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.