Hi - Ferric what should it do? (BD-Design)

by GC, Thursday, April 14, 2005, 10:45 (6958 days ago) @ GC

Hi!

Actually i think that the whole idea is very good, if you know how to implement it. The way Lowther has implemented it sucks, period. What they should have done is to modify the edge suspension and spider so that it does not apply any (or very little) restoring force to the cone within normal working conditions, say +- 1mm of travel or so. If one does that, all restoring force will be applied by the magnetic coating directly on the VC. Lowther also misses out on one of the most obvious benefits from using this type of magnetic suspension, namely increased linearity, since the magnetic coating on the units i have seen covers more than the VC. The way to implement this is to make the air gap, VC and magnetic material have the same axial length, if this is done you maximize the accelleration force you can apply to the cone. When parts of the VC travels out of the air gap the accelleration force decreases but so does the restoring force of the magnetic material and good linearity is kept. Exessive cone travel still should be limited by the machanical suspension. Unfortunatly it seems like all real knowledge went out the Lowther window together with Mr. Chave and all they have done since are raising prices and ruined good products.

Best Regards,
Anders

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