Hub motor internal drag and seizing overnight??

[matchbox2022]

Hopefully this isn't too crazy of an ask. I am very much a noob at this.
Literally just put my ebike back together and started having issues with the hub drive.
Put new freewheel on as last had snapped cogs, throughly "degreased" with brake cleaner most of the surfaces including the axel (possibly solvent got through the rubber dam into the hub) on both sides.

Thought perhaps my rear brake had seized, but no its the hub now.

If I leave the bike alone for a day the cycle will occur.
Bike wheel is seized, If I push REALLY hard, the hub wheel will begin to spin, and "seemingly" works again. No super obvious drag on any component or odd sounds.
Slight humming when throttled on with bike elevated after breaking in the seize.
Does not reach top speed unless I apply the rear brakes considerably to the wheel against full throttle rotation forcing it to work against the brake (apx 1000W being used), then I will feel a jerk of sorts, release the brake, and "almost" top speed is re-achieved (apx 10kph slower than I'm used to seeing at full charge 59V)

It will run and perhaps make a "slight" off noise like a hum but that's probably me not understanding what motors sound like.
Hoping it isn't ruined bearings, not sure why it'd be rust...any ideas with this strange behaviour? No salt climate but does rain.

Bike is at apx 2500km total 2 years old.

Video walks wheel slowly to observe freewheel and sounds, runs wheel full throttle, wheel speed 45kph, then I use brakes until I feel/hear a "tug" as if something became freed with brakes on, and release. I have to slowly apply more and more brake leverage and then it will suddenly "jerk" up to proper speeds. sudden increase in sound frequency (spinning wheel) is not due to me releasing the brake pressure.
I release brake, Speed increases to 50. I do it yet again, and release, top speed increases to 52.
I believe typical topspeed no load is originally 62 @ 54V

Can't spin rear hub more than a half turn with a normal "push" as if the brakes were dragging on it. Brakes were removed to verify this, they are definitely not the problem.

Fixed the video here's the link

502728836_9856735997747899_146900998532627938_n.mp4

drive.google.com

 

[neptronix]

What motor is it?

What preceded taking the bike apart?

 

[matchbox2022]

Hardtail (lots of bumps around here)
2kW DD rear hub motor, no idea the make, was from a Conversion kit
Nothing preceded, seemed to be working just fine. Wanted to be able to pedal again without a broken freewheel.

 

[neptronix]

Strange. Has it been exposed to rain in in the past?
How's the wiring near the axle, and exposed wire possibly touching another wire?

Solvent would be pretty rough on some parts of the motor, if a lot got in.
If nothing is evident on the outside, it needs to be opened up and inspected.

 

[chuyskywalker]

Too much brake cleaner and bearings would make for a pretty bad spin, but that'd be more a consistent behavior, not what sounds more like an electrical problem.

Video would help a lot.

I recently fixed a guys bike that was behaving similarly due to a melted phase wire plug. Still made contact, but very badly and would sometimes run, sometimes not, started very hard.

Motors can also behave badly if the phase wires are not reconnected in the same order they were in previously. Some controllers have learning functions to figure out the phase arrangement, but many cheaper kits will not. As such, being out of order can also cause some very quirky behaviors.

 

[amberwolf]

Literally just put my ebike back together and started having issues with the hub drive.

Back together from what specific disassembly, and for what specific reason?

What happened before the initial problem, and what was the initial problem?

 

[matchbox2022]

Back together from what specific disassembly, and for what specific reason?

What happened before the initial problem, and what was the initial problem?

Cog had snapped off freewheel, put on new freewheel, throughly degreased axels while working on it (axel up, so gravity down) both sides.

I had to use an impact driver to get the freewheel off, but I didn't detect anything off and did it flat on (no twisting motions, did it flat down with wheel completely braced).

The only other thing I can think of is going over a fairly big bump since re-assembling since I hadn't noticed until fairly recently, other than the degreasing, it is a hardtail and tire was at max psi(50) so quite firm if that somehow bent the axle? Really don't understand why the wheel is so hard to move, it probably spins on its own momentum about half a turn with a good shove, as if the brakes were dragging (they are not, took them off to verify).

Added new longer video in link, I do see the freewheel moving as if something is bent, would love some help confirming.
Could use some help, this behavior of no top speed without load and this mysterious drag on the wheel fixed by apply rear brakes would help a ton! Very much a noob still with e/bikes in general.
Any advice appreciated bigly.