Speedway leger minimotors NOISE normal?

marce002

10 W
Joined
Mar 28, 2016
Messages
76
Location
Buenos Aires
Hello guys I just wanted to exagerate the noise at certain rpm and with uphill force to make it clear to hear... is this noise normal for rhis scooter? it works fine in any orher rpm speed but at some point this is what is heard:

https://youtu.be/FO6x4Cv1K6A

it was at constant speed cruise on 14km/h


specs:
500w motor
speedway leger scooter
top speed 45km%
 

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It's hard to say for sure, but I think you found a resonant frequency for your system. Chances are, your hub motor (or whole scooter) wants to ring a certain note, and when the motor makes that same pitch, it starts ringing.

Both my e-bikes (with different motors, different wheel diameters, different voltages, etc.) exhibit a singing sound as they pass through 17mph with the motor pulling hard. I think the fact that they both do it at about the same speed is a coincidence.
 
thanks a lot for your answer.... it might be normal i asume i ll try not to mantain such permanent noisy automatic cruise speed
 
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