Thanks for the comment! Maybe it's back to a leadscrew...

Harold

>
>
> 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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