Hello everyone,
I am having this annoying high pitch whine whenever I hit 20mph on my eMTB after I get to about 25mph it will stop and be smooth again but I ride a lot in this middle range. My setup is 12s with FOC boxes @CarlCollins . 190kv 6374 from @torqueboards and 1:5 helical drives from @Nowind. Can anyone shed some light on how to eliminate this? My switching frequency is 30khz but it wasn’t any better at 20
Edit: sometimes it is very smooth into and out of the whining but other times the sound hits a brick wall and just stops on a dime
I’ve had something like this with one of my APS motors, the outer ring and a couple of the magnets had partly come loose and were creating a fairly ugly whine in a certain RPM range. Maybe try figure out if the noise is coming from a specific motor and if so, pull the motor apart so you can inspect the magnets inside the can
Damn. Ok. Luckily I got some green loctite sitting around so I will try to fix this tonight. Just put some loctite on the magnet and then place it in the can?
Is there a quality motor that doesn’t have this issue? I have seen way too many cases of loose magnets recently
@trdolan03 - You’ll probably have to send that one in. Consistency on one of our latest batch hasn’t been great on our 6380 Black. We have some new ones in production but won’t be done until next month. Send us an email and let me know your @trdolan03 so I can remember this issue.
I still haven’t isolated the actual high pitch noise specifically though.
So the motor in the pictures is not longer on my board and I am running single drive atm. Still getting the whine but now at 25-28mph. @Nowind Could this be a function of the helical drives?
100% not, they sound (I mean they don’t sound ) equal no matter which speed.
This is for shure the motor. This whining sound reminds me on faulty APS 80mm motors which people posted. I know exactly how you feel now, chin up bro! I am also still searching for a reliable motor which holds longer than a few weeks, it’s really frustrating.
These motors in general are made for hobby RC models and not for human transport I think this is the main problem regarding safety and reliability.
let me know in case you found one…
the problem is, when you think there is one long lasting motor they change something in production and the next who buy get shit again…
how about your sk8? still goes strong or already gave up?