yep agree with needing an oscilloscope to look at the true output voltage. the ESC regulates the power delivered to each phase of the motor by modulating it at a pretty high frequency. So when each phase is switched on, the esc also switches the phase on and off to regulate the power. This frequency will be different depending on the make and model of the ESC, i have measured 8kHz on a turnigy one. This is a lot higher than the frequency that it is then switching the phases, which will be the motor RPM if its two pole.
I would have thought that this would be pretty hard to measure on an AC voltmeter. My next step would be to buy or borrow a different ESC and or battery and see what eliminates the fault.
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