If you have done your research you have probably found a lot of conflicting information about what KV is “best”. Often times this information is given without regard to system voltage or electrical rpm limits. The VESC has an ERPM limit of 100,000 but I have found that limit to be closer to 60,000 ERPM. Vedder has stated that running higher than this is inefficient but I have also found that it causes VESC failures.
My findings are purely anecdotal and I am not completely sure but a pattern has developed where systems designed with the 60,000 ERPM limit in mind run trouble free.
What does this mean and how do you calculate an ideal motor kv for your particular system voltage? It is relatively simple, virtually all the motors used in eboarding have 7 pole pairs, divide 60,000 ERPM by 7 PP and we get roughly 8570 rpm. Divide 8570 rpm by your system voltage and you will have your ideal motor kv. I like to make my voltage calculation based on a fully charged voltage so 12s would be roughly 50v.
8570 RPM/50v = 170kv - 12s
---------------/42v = 200kv - 10s
---------------/33v = 260kv - 8s
---------------/25v = 340kv - 6s
These numbers are a rough guide, you can go a little higher but use caution. If you a want a smooth running reliable system this is a good first step to help achieve that.