[PSUBS-MAILIST] Underwater linear actuator to 2000ft

[Alan via Personal_Submersibles]

Found this underwater actuator.
Wouldn't dare estimate the price, but it is probably something we
could make easy enough!
https://www.ultramotion.com/industries/underwater-linear-actuator/
It is oil compensated & uses a brushless motor.
From the pictures, it has an enclosure near the rod end that has slots
in it. I am guessing there is a rubber bellows / bladder in there to keep
the inside of the actuator at ambient pressure & to expand & contract
to compensate for displaced oil as the piston moves in & out.
   Of interest is that it is saying that the motors can be over-driven by
2-3 times due to the dissipation of the heat off the coils to the seawater
through the oil. A good argument for oil compensating rather than air.
Also being brushless the oil is not going to lift the brushes.
Alan



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