Quentin_Rufin wrote: ↑
Jul 12 2018 11:21am
When you use a DC motor it generates a current on the opposite direction. This is called back EMF.
This happens in any motor, but it doesn't have anything to do with the battery voltage--it's all on the motor side of things.
A diode between battery and controller will not do anything other than lower the battery voltage seen by the controller by the Vf of the diode (reducing the power the controller can receive), and waste some power (range) as heat in the diode.
It won't change the BMS behavior. The BMS will still cut off at the same voltage it's designed to, as that's based on the individual cell voltages.
The diode *will* prevent any of a regen-capable system's back-EMF from being able to recharge the battery, preventing you from recovering any energy and causing the system to have less range than it could otherwise have.
Your system wouldn't have any regen energy recovery anyway, since it's got freewheels between ground and motor, but if you did have such a system, like a DD hubmotor, you'd get *less* range with a diode there, not more.