[PSUBS-MAILIST] magnetic linear actuator

[hank pronk via Personal_Submersibles]

 Alan,I have not taken one apart yet but it sounds like it is a tricky one.  I was hoping there was some sort of magnetic rail actuator.  I have been Googling around but have not found anything yet.  I have had superb results with electro magnets under water (fresh)  and figure that could be the answer.  I  will keep looking.Hank
    On Friday, September 29, 2017, 8:07:33 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hank,I spent a lot of time investigating oil compensation of linear actuators alongwith Frank.. He was looking at the Lenco trim tab actuators.Have several. The motors in them are small & brushed & run rough inoil. When the rod extends that leaves a void inside the actuator that needsto be filled. So you end up with an external oil reservoir to fill the actuatorwith ambient pressure oil as it extends. ( so why not just push it out with the oil)There are micro switches that I drilled with tiny holes, to let ambient pressurein so they didn't trigger under pressure. Also there are electronics in someactuators that may be effected by pressure. And of course there is the wiringgoing in to the actuator that needs sealing & the seals on the rod that may need replacing.Much simpler to use hydraulics. I did see an electric manipulator operatingat the Underwater Intervention Convention. Can't recall it's name.   From time to time I have a google on robot sites to see what is new. OrAlibaba to see if the Chinese have come up with anything cheap.Nearly bought a kids hydraulic arm toy that you assemble, with view to scaling up out of aluminium.Keep thinking, but the robotics World is big & if there is a new & easier wayof doing it they'll find it.Alan

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On 30/09/2017, at 1:08 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:


I have been brain storming looking for a less expensive and less complicated means of building manipulators.  The obvious choice would be electric liner actuators, oil filled etc.  Then I was thinking about a magnetic actuator like a mag lev rail.  Is there such a thing?  You know, add more voltage and the actuator moves out further.  Any ideas?  Hank

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