I have been looking at the Allied Motion CM-900 brushless hollow shaft servo encoder motors for driving screw shafts on 3" diameter x 12" length 1,000ml piston ballast tanks for rov submarines.The water pressure inside the piston is 10psi and the total piston travel should be less than 30 seconds.The motor will have forward,reverse and position memory.Has anyone had experience with these types of motors ?