Talon said:
Like I mentioned before, I have a PowerVeloCity 6FET controller that I have set at 30amps and 50 phase amps now.
I need to pull around 40 amps for more torque.
Your previous post doesn't mention the power levels (just the controller model), however: having a controller that can supply more amps doesn't mean you get more torque. That depends on the system and conditions.
If you're looking for faster acceleration from a stop, a higher current controller *could* help, as long as you are already pullling the max current from the existing controller for the time you need the faster acceleration to occur.
If you're not maxing out the existing controller during those seconds, then it's not going to help to have a better controller. You'd need either a different motor that's built for more torque (wider magnets and stator, or a different winding taht provides more torque and less speed), or a higher voltage battery to go with the higher current controller, to force the motor to pull more current.
If you're looking for more torque for hill climbing, keep in mind that just pushing more current thru the same motor will heat it up faster, and to a higher temperature. If it's not getting hot now that's probably not an issue, but if it's already getting hot you may have to implement cooling mods on it (there are quite a few threads about that sort of thing if you need help with that). If it's a long hill that you haven't been able to climb before, then it's likely to be able to overheat the motor doing it.
If you're just looking for more speed, then more torque is not usually the only thing you'd need (and may not need it at all).
I have an URB-E that will just touch 25mph with a 48 volt battery. I would like to get closer to 30mph with 260 pound total weight with driver and bike. The URB-E only has 10 inch wheels.
When you are at the max speed, are you also at max current?
If not, higher current controller will not help. You would need one or more of these:
--a motor wound for more speed (and less torque),
--a larger diameter wheel/tire of a ratio to your original equal to the ratio of the speeds,
--a higher voltage battery, at least of a ratio to your original equal to the ratio of the speeds.
Also note that your power usage will go up significantly for that small difference in speed, so your range will drop at least proportionally (probably even worse, because you'll be pushing the cells harder, so they will deliver less total capacity).
If you need the same range at the higher speed, you'll either have to recharge along the way/etc., or get a second battery pack to parallel with the first, or replace the first with a bigger one,
