Oh nooooooooo ...
I have 230KV motors !!
Would it be OK with 10S ?
230kv and 10s should work fine.
@Vanarian: How do you make sure you max at 3.6Volts only for your 14s ? The slightest regen will make voltage override this 3.6 volts, unless there is a trick ?
The trick is in my battery setup, I went LifePo4 with a BMS and the BMS doesn't allow regenerative current so I kinda "cheat" since I can't go past 50,4V total like this. Equals to a 12S 4,2V Li-Ion (50,4V)
195 kv should work fine with that voltage. If the voltage doesn't go higher than on a 12s lipo you should be fine in most cases. A 12s lipo is also close to the limit, so even then you should be careful. However, if you BMS does not allow any regenrative braking at all, you won't have any brake at all. You are also very likely to break something when you try to brake then.
FYI do not use a 200kv+ motor with 12 series. My 270kv motor killed the drv8302 after one 7 mile ride. I didn't know but found out from vedder there is too much electical rpm with 200kv+ and 12 series. I hope this can be fixed in the future though, my goped sounded like a f1 racer running at 12s rpm and held up going up hill and against the wind with the 35 to 40mph I was going.
270kv which gives 100k ERPM allows very few samples at 35 khz switching frequency to track every commutation. Notice this is assuming that you use a 14 pole motor. Some outrunners, such as my scorpion outrunner, have even more poles and then the maximum KV is even lower.
Another problem is the high voltage itself. The ceramic capacitors will loose up to 80% of their rated capacitance at the rated voltage, which makes things even more sensitive. It might even make sense to change 4.7µF 50V caps to 2.2µF 100V. Or you could stack capacitors on the pads to get more capacitance.
I haven't tested it much, especially not with the IRFS7530 FETs which are more difficult to drive, but you could try increasing the switching frequency. Then you get more samples every commutation on high speed, but you could get the problem that the DRV can't keep up with the switching.
I will experiment more with this when I get home this weekend since I have a 270kv motor. It is not easy to make it work for every possible kv/inductance/resistance/voltage combination without having the setups myself.
Thanks for the quick fixing.
