I have looked very closely into RimTec magnetic clutches about a year ago. I encourage everyone else to check it out for themselves but I found they were very limited by the type of barrier that one could have between the shaft mag plate and the mag clutch. Less than 6 mm in most cases which was not practical for my application and the pressure I was looking to work with. The barrier has to be non-magnetic of course.
There is also a significant limit to the torque they can transmit through a barrier this thick. Since they are custom made, they are also very expensive. Much more expensive than building a good quality shaft seal. I was very hopeful at first but do not feel they would be successful for a 1 AMT psub. Be sure to check them out for yourself.
John
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