QS Motor Grinding after phase wire replacement

[C4m3Ltoe]

A friend of mine has recently replaced the frame on his stealth bomber clone. While doing so, he has replaced the three phase cable from the hub to the controller. Since completing this, there is a horrendous grinding noise when load is applied to the rear. I didn't take a video, but did sound very similar to this -

https://www.reddit.com/r/ebikes/comments/phmmyl

The bike is running a QS 266 hub and the cable replacement was done by a friend of ours that is an auto electrician. The Sabvoton controller is also behaving strangely, with a green steady light and intermittent two red flashing lights. Putting a dongle on and connecting to the app does not give any fault information, in fact the fault section is marked as "fault free". Interestingly the LCD screen connected to the Sabvoton is showing error code 11, which if this is being sent by the Sabvoton, refers to "Top bridge arm driving failure", I am not sure what this means?

The hub motor was taken off today and opened up, everything inside seems fine. Magnets seem good visually, both on the stator and the inside of the hub casing and are all very solid.

I am going back this weekend and taking some tools to troubleshoot further. So far my thoughts are;

• To take a vernier pully to measure the magnet placements.
• Multi meter to fully ensure hall wires are fine, although I am not sure exactly how these should be wired. The auto electrician replaced them all like for like by cutting them within the hub enclosure and jointing them and matching colours.

Has anyone else come across a similar issue, or could recommend some troubleshooting steps?

Some pics attached

 

[Ianhill]

If he cut them and swapped them over like for like tjen that shouldn't be an issue the motor would have a short otherwise and would feel locked up to turn.

Magnet failure normal sounds like a grinding sound and can have a clicking sound with it as the motor rotates catching on anything left behind.

If you have poped the cover off and checked the motor have you checked it from both sides ? could be a corner that smashed off even a piece of contaminants in there sucked up a metal chip a lose screw anything that could cause a bad day.

Keep us updated with what u find.

 

[C4m3Ltoe]

Just to update, it was a short on two of the hall sensors. They were both registering a constant 2.9v.

No idea how this happened as my auto electrician friend cut and reconnected all the cables perfectly so we are putting this down as static damage.