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This paper presents an analytical method to study ferrofluid seals in ironless loudspeakers using a Coulombian model of magnets. The motor contains outer ring magnets and an inner moving piston. A ferrofluid seal centers the piston and provides an airtight seal while exerting a pull back force. The force depends on the piston profile, so profiles are studied that make the force proportional to displacement. A method is also presented to design the ferrofluid seal shape based on the piston profile.

Author

merrick

Language

EN