Erni:
I'm not so sure of that.
High resfreshrate ESC, FL6A FAST PWM ESC
Up to 600Hz PPM input
http://www.flytron.com/multicopter-parts/178-fl.htmlServo 560Hz
MKS Servos DS-8910A+ Titanium Gear High Speed Digital Mini Tail Servo [MKS-DS8910A+] - AMain HobbiesServo Frequency and Center Pulse Width Information
Welcome to This Expert Blog about Radio-Controlled HelicoptersUsing standard ESC's with high refresh rates
http://wiki.openpilot.org/display/Doc/TurboPWM+ESC's#TurboPWMESC's-Recommended%26nbsp%3BESCsettings
That is interesting, and I can see that lots of users and vendors have done lots of work in trying to identify componets that work well above standard servo framing rates, but I don't see a datasheet from an original manufacture stating it's designed to work at other then 'standard' servo update/pulse width control. I see one venndor/supplier that stated they perform a firmware changed/updated, others just tested at non-standard rates. That's not to say these are not viable to use, but seems to rely on this vary caution:
How do I know if my ESCs are compatible?
The only way to test it is to apply different input PWM frequency signals, make them change from low to high, and vice-versa. Check the motor response (notice how fast it achieves the desired RPMs after the input data changes, using tachometers). You should also check if it responds reliably, does not lose the sync, etc.
That implies that the original manufactures of the ESC don't rate them for other then standard 'servo timing', and that some users and vendors have taken on a task to seek out units that can be made to work at other then standard conditions. So once again is there any datasheets from an original manufacture, rather then a vendor/seller/user, that documents it's design PWM input rates and pulse width outside the standard servo timing rates?
Lefty