Electromagnetic transducer having paired Halbach arrays
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United States of America Patent
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Apr 10, 2018
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app pub date -
Dec 22, 2016
filing date -
Dec 22, 2016
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Abstract
An electromagnetic transducer, such as an audio speaker, having a voicecoil disposed within a magnetic gap between a pair of magnetic arrays, e.g., Halbach arrays, is disclosed. In an example, the paired Halbach arrays include vertically-poled magnets to direct magnetic flux across the magnetic gap orthogonal to electrical current carried by a planar winding of the voicecoil. Accordingly, a Lorentz force may drive an oscillational mass, e.g., a speaker diaphragm, in a longitudinal direction orthogonal to the magnetic flux and the electrical current to generate vibration or sound. Other embodiments are also described and claimed.
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