Vibrations at voltage-dependent RPM range

hias9

1 kW
Joined
Jul 11, 2018
Messages
446
On a mid drive bike when accelerating full throllte, I always have vibrations/resonance at a narrow RPM range which is proportional to the battery voltage or the voltage the motor is seeing.
This happened with two different types of controllers and settings have no effect on where those vibrations occur. Only the voltage has.
For example: At a fully charged battery, they will always occur when passing 2700rpm, while they will always occur at 2400rpm when the battery is half full.

Does anybody have an explanation what could be causing this?
 
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