Thursday, May 6, 2021

Re: Ang.:Re: [electricboats] One engine down...looking for solutions/suggestions

Too late for me but I have been thinking on the same track: I have recently made some orders from this company:


and am waiting on the shipment to arrive. I am testing their motor controller, programmer, throttle, and a couple of different motors, one 4kw and one 8kw. Part of my hypothesis is that while the sevcon Gen4 is awesome, maybe we don't need quite that expansive a feature set. It's not a road vehicle after all.  

I also looked at brushless pmac motors used in drones and electric scooters. Mostly they seemed to not deliver suitable torque, at least as specified. 

But either way I think direct drive of a sail drive with no transmission is an unusual case.  Is it just to avoid extra mounting hardware that you don't want a transmission of some sort? Would you put some kind of thrust bearing inline with the shaft?
I think one of the risks with direct drive in a non-sail drive/v-drive config is that the electric motors aren't designed for any kind of significant axial load. Would the sail drive remove that concern?

On May 6, 2021, at 15:01, Carsten via groups.io <Carstensemail=yahoo.com@groups.io> wrote:


You're right about that, Jamie.
But we can't have 50.000V on our boats, max 48 or 96 V...
I tried to look up the manufacturer, but without success. Assume it's just another Shenzhen backyard company.
Please enlighten me, if some of you have ANY experience with this kind of motors !
I am going to Guangdong Province this weekend (the center of manufacturing in China), so if any really reasonable ideas, I would be able to go for inspection of a supplier.

Was that a bomb to you ???!!



På fre., den 7. maj 2021 klokken 1:03, jamie.schlinkmann@gmail.com
<jamie.schlinkmann@gmail.com> skrev:
I'm sure some people will cringe....but these large outrunner drone motors are very efficient. There are several manufacturers of motors like this:
 
This motor will get into the desired RPM range at 48V and below 10kW it will be very efficient. Of course it will also be able to produce more power when needed. Also there is a series of open-source drives available on the market that are very well designed...
 
I know many will say they are not hardened for the marine environment but they certainly can be. If I were doing this kind of conversion on a saildrive I would look hard at components like this.
 
Jamie
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