Help finding a solution to Bafang gear stripping

[jateureka]

What were the conclusive results of all the testing?
One metal gear and two nylon?
three metal gears?

For a front wheel hub motor s/n BF803D10230 36V 200W, for 26" but mounted in 20", I don't see a model number.

[docnjoj]

My newer Bafang has not had any problems at 54 volts in over a year of regular use. Prolly 1500 miles. All nylon gears.
otherDoc

[johnrobholmes]

I think it ultimately depends on the wheel size. If you are riding a 26" wheel, I wouldn't push them more than 12s lipo or 16s life and 20a battery/ 45a phase limiting. On 36v it seems that 25a/ 60a limiting is acceptable. The smaller the wheel, the more power that can be pushed through the plastic gears.

[Russell]

What were the conclusive results of all the testing?
One metal gear and two nylon?
three metal gears?

For a front wheel hub motor s/n BF803D10230 36V 200W, for 26" but mounted in 20", I don't see a model number.

I just recently retired my Bafang after over 5,000 miles but it wasn't because of any problems with the original gears. I used the 36V motor at 48V for 80% of those miles with half of that at 15A and the rest at 20A. I do use my motors for assist rather than the prime motive force but I do have hills though nothing very long. Still I have gotten the small geared motors I have run pretty hot from time to time, enough to melt the internal hall wiring insulation on one 24V model running at 48V, but the gears never were a problem for me. My thinking is if you are running the little motors at power levels high enough to puree the gears then the motor itself won't last very long despite switching to metal gears as something else will likely fail. In my experience hall problems on a Bafang are the more common failure mode.

-R

[jateureka]

Sorry for the poor wording in my first post.

The plastic gears are stripped after about 12 months use. I am looking at alternatives to just replacing with 3 more plastic ones and was wondering if just one metal with two plastic could be a marked improvement.

The motor details:
front wheel hub motor s/n BF803D10230 36V 200W, marked as 26" but mounted in 20" rim for more torque.
This is in a delivery trike that uses 36V LiPo with 15A controller and carries up to 40kg load plus rider. Ambient temperatures can get up around mid to high 30s degrees C.

[docnjoj]

I did the 1 steel 2 nylon replacement on my older Bafang and rode it for about 2 years without problems on a 20" wheel. This after peanut buttering the older nylon gears. Only a slight increase in noise level. Worked fine.
otherDoc

[jateureka]

Thanks for the reply otherDoc.
I'm hopeful that one steel planetary gear with two nylon will work for this setup too, although I haven't stripped it down yet to confirm no other damage.
Who did you order your gears from?

[brumbrum]

I've just finished reading this 22 page thread and thought i'd bring it back to life. has there since been anymore failures with or without the metal gear?
I'm in a similar situation with a Golden Motor '902 prokit' which is geared and rated at 36v 250watt. I have not received the motor yet so have not had chance to take apart. i want to run it with a 54v 20ah lithium-ion pack. What would be a safe cantinuous and peak amp limit? 26" wheel btw.

has anyone had any expereience with the above motor?

Thanks

[zukster]

Finally after 3 years of use, my son stripped the nylon gears in his rear drive Bafang SWXH 26
Inch wheel model being run by Ecrazyman/keywin 350w/20a Infineon controller and 60V to it.

I had already ordered some metal gears from keywin a couple of years ago (I don't know if keywin
is around anymore), so I just had to install them. One of the nylon gears had actually cracked and
jammed the motor. Not wanting to take anymore chances, I used 3 metal gears.

Its not too loud when the motor has been treated with ACF 50 or fluid film inside to protect it.
See viewtopic.php?f=2&t=12984&start=60#p218898

Also a note. The insides of the motor are in good shape, so the above treatment worked and
did its job of protecting the motor though a couple of winters.