Linear Motors

    
Hello to all, this is my first posting to this newsgroup.

I need some help/advice with linear motors controls.


I have a couple servo position controllers, left over from several
projects I've worked on. The position controllers were used in
applications driving hydraulic actuators, +/- 20ma with a null current
from 0ma to 1ma.

I would like to setup a training stand for configuring the servo
position controller boards. I don't think I can setup a hydraulic
actuator mostly because of price and the requirement of a hydraulic
pump and can also be messy. A pneumatic actuator will work, I've tried
and succeeded, but it is also pricy and compressor is noisy. My only
option, I think, is to use a linear motor. Please see attached link:

http://www.firgelliauto.com/default.php?cPathp

I've been looking for 5 to 10inch stroke length with a 1 to 3 second
travel time.

The only problem is that the linear motors accept a voltage ON and
voltage OFF to move. Typically 12VDC to 24VDC at 10amps. This is a
problem for me because I have a +/-200ma capable servo position
controller and not a 12vdc at 9amps to drive.


Question:

1.    Are there any linear motors out there that accept a 4-20ma or
0 to 20ma? Or a 0-5VDC control signal input? And priced under $1000?
2.    Are there any conditioning boards for converting a current
input to the continuous required DC ON and OFF signals to finely
position the linear actuator?
3.    Are there better options other than using a linear motor?

Any input is appreciated.

Thanks