Since lots of medium-duty trucks and similarly heavy buses have been converted or built as EVs, the obvious source is whatever components they used, perhaps salvaged from a vehicle which has been scrapped (usually because the battery is dead or the owner has given up on the idea of an EV for that application).
Typically, they use either a very large-diameter motor, or a motor with a fixed-ratio (single-speed) reduction gearbox, mounted where the transmission would normally be.
A lot of surplus electric drive hardware came from the bankruptcy of Azure Dynamics, but their only heavy enough vehicle was the Balance hybrid system for Ford chassis; it used a big induction motor and reduction gearbox, but I don't know if any of those are still available somewhere in the salvage market.
A few people have tried or at least considered projects with the components of the Smith Newton truck. It used a reduction gearbox.
TM4 (now a part of Dana) specializes in motors for large vehicles, but I doubt that it is practical (if it is even possible) to buy a single new motor from them. In their range, you would presumably want a Sumo MD. An alternative from another part of the same company's product ragne would be to replace the whole drive axle with one with an integrated TM4 motor, from Dana Electrified.
Most proposed DIY projects of this size don't get built, likely due to the high cost of the required enormous battery, but if you search in the forum for "bus", "RV", or "motorhome" you should be able to find some previous discussions.
Typically, they use either a very large-diameter motor, or a motor with a fixed-ratio (single-speed) reduction gearbox, mounted where the transmission would normally be.
A lot of surplus electric drive hardware came from the bankruptcy of Azure Dynamics, but their only heavy enough vehicle was the Balance hybrid system for Ford chassis; it used a big induction motor and reduction gearbox, but I don't know if any of those are still available somewhere in the salvage market.
A few people have tried or at least considered projects with the components of the Smith Newton truck. It used a reduction gearbox.
TM4 (now a part of Dana) specializes in motors for large vehicles, but I doubt that it is practical (if it is even possible) to buy a single new motor from them. In their range, you would presumably want a Sumo MD. An alternative from another part of the same company's product ragne would be to replace the whole drive axle with one with an integrated TM4 motor, from Dana Electrified.
Most proposed DIY projects of this size don't get built, likely due to the high cost of the required enormous battery, but if you search in the forum for "bus", "RV", or "motorhome" you should be able to find some previous discussions.
