I will answer tomorrow more in detail bcs its late now.
So far just a word in advance to prevent from guessing too much.
1. A brushless motor as we use it is in no way a motor where you just hook up some power and it starts turning.
These motors need a precise timing on their coils there fore they are:
-no wear parts exept ballbearings
2. They are controlled by micro computers. The microcomputer connects to the AMEL hardware.
There are no rellays involved. Relays are inefficient.
I can provide a design note, its manly only 3 component groups, but it will not help anybody because the involved software is the key.
3. Yes, I am willing to set up a pump system that is simple to install and replaces the old pump. I imagine it will be just a modern replacement to get rid of the problems.
Oliver from Vela Nautica Amel54 #39