On Fri, 26 Aug 2005, Harold Hallikainen wrote:

> Anyone have experience with voicecoil actuators? I have an application
> where one might be useful. We're looking at a maximum displacement of
> about 50mm and a force of 22 Newtons (about 5 pounds). Using a normal
> solenoid (non-magnetized slug), it appears we need about 4,700
> ampere-turns to do this (100mm coil length, 30mm coil diameter). It SEEMS
> that it would be better to use a permanent magnet instead of a
> non-magnetized slug. I'd expect the force to be proportional to the
> product of the two fields. But, anyone here have experience with these
> types of actuators? Any comments?

I have limited experience with voice coil actuators made from sub-bass 
drivers (floor shakers). I think that 5 pounds static is going to be 
tough. These devices overheat very quickly if they do not move. In 
normal operation they are ac coupled and ventilate themselves. I had 10 
mm stroke with ~500 gram load with 5A into 3Ohms. The driver would 
overheat in maximum 10 minutes.

Peter
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