RC brushless motors are brushed motors with electronic commutation (the ESC) instead of mechanical commutation (ring and brushess).
No dedicated measuring pulses, just the power signals, and the voltage generated by the motor (BEMF signal)
The system is iso-synchronous. Zero slippage. RC controllers are not VFD's.
More
www.aerodesign.de/peter/2001/LRK350/index_eng.html
→ DIY brushless controller
How does a brushless motor work? - RCU sticky
Excellent active design discussion
BLDC controller
Vriendelijke groeten
Ron
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