> 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?
>
> THANKS!
>
> Harold
>

A little more info would be nice. Required actuation speed, duty cycle,
system power limitations, actuation frequency, physical size limitations,
etc.

I don't have any experience using perm magnets vs. steel, but have you
considered geartrain/leadscrew options? Also be aware of automotive starter
solenoids, about 1.5 inches dia x 4 inches long, inch or so of stroke and
about 10 lbs force.

-Denny

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