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Magnetic field coil ferrous material for loudspeaker
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[QUOTE="Baluncore, post: 6855686, member: 447632"] Then how can you beat a rare earth permanent magnet? Electrodynamic speakers (that used electromagnets for the field) died out with the advent of better PMs, about 15 years before vacuum tubes were replaced by transistors. You are really constructing a linear motor. Field current is seen as a waste of energy, so DC motors now use permanent magnets. To be brushless, those PMs have moved to the rotor, so DC motors can now switch the current driving multiple stator windings, rather than employing commutators on the rotor. A loudspeaker needs to have a low suspended mass, so it is the voice coil moves, while the PM and magnetic circuit, remain fixed. [/QUOTE]
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Magnetic field coil ferrous material for loudspeaker
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