Jerry,
Most of the more recently designed controllers don't really have a problem dealing with more than 200A continuous, and I believe that there are at least a few 48V motors that deal with that type of power. Most of those motors should be liquid cooled.
That said, the low-tech answer is to gang two of the ubiquitous MARS motors together, like ElectricYacht has been building for a number of years. This is a solid answer and does some level of redundancy built in. Using cheaper motors and smaller controllers, it's easier for the cruising boat owner to stock spare parts. I haven't put a system like this together myself (my boat is fine with 5kW), it seems that the system should be relatively self-balancing. Using Sevcon Gen4 controllers (like mine), you should have plenty of information available to confirm that the motors are operating "in synch". If I was going to build this with a belt drive, I would mechanically couple the motors through the drive pulley itself and run a single belt.
fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, "Jerry Barth" <shredderf16@...> wrote:
>
> I think I sort of asked this question a couple of years ago but I'll ask it
> again in case there were some new developments. I have a 35 foot cat
> rebuild project that I'll start in about two years (after the house
> remodel). One hull already has a Yanmar 2GM20 in it. I need power for the
> other hull. I would like to do some kind of diesel hybrid because I need a
> genset anyway to run a dive compressor and water and ice makers. I
> corresponded with Arjan Bock when he did his unsuccessful cat hybrid (not
> enough power, melted controllers, etc.) Based on his experience, I think I
> need a minimum of 10 KW turning the prop. I don't believe anyone has come
> up with a motor this big that is 48 volts, am I wrong? Also, I think just
> about the biggest controller there is can only handle about 100 amps without
> getting too hot. The other idea I had was ganging two 5 KW motors together
> on a baseplate turning a common shaft through belts with two controllers
> both running 100 amps or so. Has anyone tried this? Would we get into
> problems where one motor is out of sync and working harder than the other?
> One advantage I thought of is that you would always still have at least half
> power in case a motor or controller failed.
>
> Thanks,
>
> Jerry Barth
>
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