Just a question. Any reason you mounted the temp sensor on the end cap where you did?
I would have probably tried to mount it actually on the windings if possible.
Stielz wrote: However I need a second method of braking for when the battery is fully charged so that I dont have my $250 (NZD) battery pack go up in smoke when the lipo batteries get over charged.
Stielz wrote:So I think I will use regen brakes as the primary braking method and use the phase shorting method with a very low PWM frequency - around 100 Hz as the secondary method for when the batteries are fully charged. I have already built a voltage sensor into the circuit so having the microcontroller automatically decide what method to use is no problem.
If you short the phase wires at 100Hz, the energy will still circulate to the batteries through the body diodes in the FETs.
You really need a big load resistor to suck up the excess energy in the event the batteries reach max voltage during regen.
If you had such a resistor, it could just go across the pack anytime the voltage goes too high.
AAAkings wrote:Thanks for the reply and tips. Much appreciated.
Now one final question. Would using an motor like yours be recomended (RC engine) or should I look for motors meant to drive a persons weight like a scooter motor? Mainly hoping that the engine is not overworked due to the weight of the rider.
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