Roger Stockton wrote > ...Does the manufacturer state a maximum battery wiring inductance value > that the user must observe, in the same way as they would an input voltage > range? Even if they do, how does the hobbyist determine if they are > within spec or not?...
The hobbyist can estimate the worst-case inductance of a wire in free space (that is to say, the wire is separated more than 10 diameters from its return conductor) at around 1uH per meter; placing the forward and return conductors next to each other, or even twisting them, will dramatically reduce the inductance. Since energy stored in an inductor is 0.5LI^2 and energy stored in a capacitor is 0.5CV^2, if you equate the two* you'll see that it doesn't take much capacitance to deal with any reasonable amount of inductance in the battery circuit of most EVs. Do I specify this in the Soliton manual? No. I do recommend that the forward and return cables in the battery circuit be run together for this reason, as well as to reduce EMI emissions, but I don't explicitly warn people that too much inductance on the battery side of the controller will hurt it. I *do* warn about insufficient inductance on the motor side of the circuit, but that is mainly to protect PM motors from the effects of high ripple current (catastrophic demagnetization and/or hysteresis loss heating). NB - I don't know of any other manufacturer that provides a minimum inductance for the motor specification, even though it is probably the most important spec to the controller. * - e.g., 1000A through 10uH of inductance = 5J = 100V across 1000uF of capacitance -- View this message in context: http://electric-vehicle-discussion-list.413529.n4.nabble.com/Inertia-switch-tp4661516p4661551.html Sent from the Electric Vehicle Discussion List mailing list archive at Nabble.com. _______________________________________________ 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)
