Fred, I think you have a very valid point. I am also concerned that to some people 'tractor' means a wee thing that tootles around cutting a large lawn and to others (myself included) a 'tractor' is a BIG machine capable of pulling at least a 4 bladed plough and would, indeed, have a good 100HP, probably diesel, engine. I think the original post is leaning more in the direction of the latter scenario. If so, then torque and the associated relevance of gearing/wheel size is could be very important.
The only full-size tractor 'EV' I have heard of is one powered by a fuel cell by New Holland. Despite being a fossil fuel powered vehicle, really, there should still be useful information pertinent to this thread to be gained from it... http://www.treehugger.com/cars/new-holland-unveils-farm-ready-hydrogen-fuel-cell-tractor.html Enjoy... On 17 Jan 2014, at 20:09, fred wrote: > I'm surprised to not see the subject of torque arise when discussing a > suitable motor for a conversion of an ICE tractor. My limited understanding > of tractors does mean more questions than answers. I've operated a couple > that have a method for a fixed throttle setting, but almost always that > setting is high, due to the need of such rpm from the ICE to operate the > attached devices. Ground speed is relatively low, and that represents > gearing, which in this example, means increased torque. > > If one is pursuing a replacement electric motor, I would expect that > horsepower means less than a specific torque at a given rpm. Electric motors > provide good torque at low rpm compared to an ICE, yes? If a specific tractor > had, for example, a 100 hp ICE, one would not have to have that amount of > horsepower from the replacement electric motor, would one? > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
