Thomas Shay wrote: > Do seperately-excited (sepex) motors and controllers > suitable for highway capable EVs exist? They are becoming > common in golfcarts, NEVs, lift trucks, pallet trucks, etc. > These motor-controller systems are too small for EVs and I'm > not aware of any sepex system the right size for an EV. > > Consider a typical modern golf cart. Its motor and > controller provides regenerative braking and reversing > without using contactors. Its controller automatically > applies regen braking to limit speeds going down hill. > > I'd really like a sepex motor and controller in my next EV. > Is that possible or am I just dreaming?
Hi Tom, The biggest sep-ex system I've seen in use is from Canadian EV: http://www.islandnet.com/~canev/Commercial/FMI/FMI.html and http://www.islandnet.com/~canev/Commercial/CEV/MightTruck/MightTruck.htm l. These are industrial trucks with 25-35 mph speed capability. They use 96 V, 500 A controllers. (Zapi controller, Kostov motor, I think.) Is it fair to assume a 96V sep-ex road EV would have similar performance to a 96V series setup? I've read about the advantages of sep-ex and don't really understand why higher voltage systems aren't available. Would it be possible to have Warfield or NetGain rewind a series motor for high voltage sep-ex? Wouldn't building a high voltage sep-ex controller from scratch be much easier than a similar voltage series controller? Chris
