Salvage my hub motor?

LCLabs

1 mW
Joined
Aug 30, 2021
Messages
15
Bought a cheap "5000w" motor off aliexpress and it ran fine for the first ~50 miles. Last weekend I went for a longer ride and pushed it a bit. The motor overheated and now has a lowend rumble growl video link https://photos.app.goo.gl/rfrfoCdUhqJkDJrr5 Opened up the hub and found the attached photos. Anything I can salvage? Could I just buy a new stator/internals? Thanks for the help.
 

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I've never seen a e-bike motor with a stamped stator rated for 5KW.
Do some basic measurements of the stator and ask someone at Quanshun if they sell a matching one.
or maybe one of these might fit? https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20220417094549&SearchText=hub+motor+stator&spm=a2g0o.productlist.1000002.0

What controller were you using if you don't mind me asking?
 
That motor is toasted. Full rewind required.

Apparently it was not a 5kW motor.
 
eee291 said:
I've never seen a e-bike motor with a stamped stator rated for 5KW.
Do some basic measurements of the stator and ask someone at Quanshun if they sell a matching one.
or maybe one of these might fit? https://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20220417094549&SearchText=hub+motor+stator&spm=a2g0o.productlist.1000002.0

What controller were you using if you don't mind me asking?

This is the one that came in the kit.
 

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DogDipstick said:
That motor is toasted. Full rewind required.

Apparently it was not a 5kW motor.

Learned my lesson on cheaping out. I have a real QS205 6t winding with a fardriver on order. I was hoping to reuse this motor on my kids bike or something. This is the kit I originally bought https://www.aliexpress.com/item/1005002235703461.html?spm=a2g0o.order_list.0.0.58161802c6wTlb
 
The first thing I'd say is that isn't a 5kw (five thousand watt) motor. Looks just like the 500 (five hundred) watt "9C" motors I used to use. Also resembles the Leaf hubmotor, which is spec'd closer to 1500w. Either way, I suspect you got cheated. :(

https://www.google.com/search?q=500w+9c+motor+stator&tbm=isch
LBtBKrY[1].jpg

In that image search there are some results from places that sell stators, but they will probably be just as expensive (with shipping) as a whole new motor. (plus, if it got hot enough for long enough, it will also have altered the magnets, reducing the torque the motor can produce, and increasing the speed it would spin at).

Second thing I'd say is that it's possible you don't have the right phase/hall sequence of wiring. If you have a false positive, it will appear to work correctly, but will quickly heat the motor up (and sometimes the controller and wiring). Note that wiring the controller and motor color-to-color rarely provides the correct wiring order. If the controller has an auto-learn function, that usually gets it right; you can verify this by checking current at full-throttle wheel offground, it should only be a couple of amps or so.
 
Apparently people still fall for that old salesman trick.
It is only a 1kw hub motor or a 500w motor as amberwolf stated.
All you could do is really measure the stator width for the correct information.
You will have to have small hands and rewind the motor yourself, or buy a new hub motor. This is precisely why you buy from known sellers or have the seller already have the pertinent info listed on the sales ad, for which to gamble on, without that info, you just skip it and move on in search of another with the pertinent info to wager on.


DogDipstick said:
Apparently it was not a 5kW motor.
 
amberwolf said:
The first thing I'd say is that isn't a 5kw (five thousand watt) motor. Looks just like the 500 (five hundred) watt "9C" motors I used to use.

It's possible an inexpensive 9C motor core would drop in to the housing and then he wouldn't have to relace the assembly. Show us a pic.
Then cut that controller in half to about 35 to 40 Amps max.
If the need for more speed is still there, add Volts(assuming you are at 48 Volts now). That's what direct motors are for, adding Volts.
 
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