Any guides for testing a kona motor for faults

[ManxViking]

Hi all,

I took the plunge after failing to get any gears and have removed the motor and its now sat on a bench. Please note i am NOT an electricial engineer.

Before i return the motor to the car, are there any procedures that anyone knows of that will allow me to test this motor to make sure its ok before i spend this week refitting it?? I have managed to rotate the motor and there are no issues there, I started off with an 'ISOLATION' message and that was the only point i had as reference. I had already remove the battery and checked all the internals but could not find any problem so was left with the prospect of a motor swap but i cannot spend £2k on a used motor without knowing if mine is causing the isolation fault. Money doesn't grow on trees in my household unfortunately.

I don't have a second battery yet to try and see if it was the pack but if i can test this motor to make sure all seems ok, then i can re-assemble it and sort a battery to borrow and plug into the car to see if it solves the issue.

If anyone here has every electrically tested their motor to check it through, i would really appreciate any guidance.

Cheers

David

[KiwiME]

You seem to have spread the story out over numerous threads so I'm not clear on the timeline but I gather you have a used motor you wish to install?

Ideally you'd replace the bearings before going to all that trouble but to answer the question you should check that the resistance from each wire to the casing is essentially infinity. Each of the three large phase wires will of course be nearly zero to each other.

That includes the resolver coils at the tail end which will have a higher resistance to the other wire in each pair of coils, perhaps 10's or 100's of ohms.

Only high-voltage parts in the Kona can cause an "isolation error" and the PTC heaters are possibilities along with the HVAC compressor. The motor inverter and LDC are not known to be be problematic but a coolant leak could do it.

There is an ex-Hyundai tech on YouTube and FB who has mentioned that a number of Kona motors have needed replacement due to such issues but he wasn't clear on how that happened. It looked to me like it was due to water ingress at the tail end.