My first build, it's made this sound from the start but I'm not sure it's something to be concerned about or not. I've never ridden or even seen another ebike so I don't have anything to go on. There's about 50 miles on it now, everything seems to work fine. Motor, controller, connections, battery do not get hot while riding. It only makes the sound under acceleration or heavier load uphill. No load top speed is 45mph. I have it limited to 25 to ride, which it does no problem.
Bike has a 1200w QS DD hub motor, KT 36/48v 15A square wave controller, 48v 20Ah battery.
There were issues in assembly. Motor phase wires had 2 colors changed: blue wire had green heat shrink and the green wire had blue tape wrapped around it. I connected it assuming the changes were there for a reason (green heat shrink to green wire from controller, etc). The motor would lock up, no rotation. I checked for cogging by touching phase wires together, it seemed fine. I then checked voltage of hall sensors which also seemed fine.
I found the really helpful BLDC wiring flowchart located here https://endless-sphere.com/forums/download/file.php?id=197293&mode=view and went through that and got it working. I did not change phase wires, only hall sensor connections.
It sounds like a spray paint rattle can but describing a sound is tough so I uploaded a short video
https://youtu.be/kjylK7Fo_JU
So is that sound normal or should I keep going through the flowchart?
Bike has a 1200w QS DD hub motor, KT 36/48v 15A square wave controller, 48v 20Ah battery.
There were issues in assembly. Motor phase wires had 2 colors changed: blue wire had green heat shrink and the green wire had blue tape wrapped around it. I connected it assuming the changes were there for a reason (green heat shrink to green wire from controller, etc). The motor would lock up, no rotation. I checked for cogging by touching phase wires together, it seemed fine. I then checked voltage of hall sensors which also seemed fine.
I found the really helpful BLDC wiring flowchart located here https://endless-sphere.com/forums/download/file.php?id=197293&mode=view and went through that and got it working. I did not change phase wires, only hall sensor connections.
It sounds like a spray paint rattle can but describing a sound is tough so I uploaded a short video
https://youtu.be/kjylK7Fo_JU
So is that sound normal or should I keep going through the flowchart?