I have a Bafang BBS02 350W I was wondering what is the, average, expected lifetime of this motor, does anyone know?
How many miles/KMs before it might explode or fail
What is the most common failure? Drop in power or speed in reaction or?
Thanks for the response and info.
What does it feel like when the pawls for the clutch or the magnet ring go? What is the impact to the riding? Basically how do I know if one of these things might be on the way out?
if the pawls are chipped, they will slip when the motor kicks in, you will hear them.
If the magnet ring goes, the pedal assist becomes very intermittent while the throttle works perfectly.
They don't give any advanced warning before they go but the slippage of the pawls become quickly very noticeable after started.
My BBS01 350 has now surpassed 2700 miles, still going strong. In those miles I have stripped it down twice for a regrease as far as I dare go, replaced the fried controller once at 1600 miles. The new controller I have reprogrammed so hoping life is longer.The other issue has been the pas being a little intermittent, the magnet ring has cracked in a couple places meaning it needs a new drive shaft with ring attached. For now I have cleaned it all up and glued the magnet ring (pieces) in place and is working fine. Hall sensor/controller connection can throw up an error code (08) so needs all the silicone removing to ensure a good connection.
I have done about 2300 miles so far. I did strip it and grease it once. I did reprogram the controller at about 1000 miles so that it was more responsive but nothing too extreme. It seems ok so far but I am starting to feel a bit of stutter through pedaling when the motor first kicks in but it might just be the chain taking up the slack.
Life depends on how you treat it. They don't like getting wet. Some leaked directly into the controller, which in the worst case can cause spontaneous burning. I guess others get water in the throttle or up the motor shaft, which compromises the 5v, causing hall sensor malfunction and consequential mosfet blowing.
I would have said that the most common problem of the BBS02, apart from controllers, is the white nylon gear, like this one I'm presently fixing. it's probably not such a problem on the BBS01 because of the lower power. Bafang have improved it now, but the one below is the "improved" version:
Hello thanks for the response and handy information. I did reprogram my controller to make it more responsive after changing gear/braking and also so that it does not drop so much power when paused (changing gear/braking).
This made a world of difference to the motor allowing me to ride a lot more dynamically through the city. Before it was only really any good a long rides in top gear with no interruptions (such as traffic, lights, junctions etc) which is not my commute (being through a city).
So personally I would recommend a reprogram on the BBS02 but it depends on the situation of the user as you suggest.
I'm not gonna say you can't, but it will be alot easier on a bench with a vice. If you need to remove the nylon gear, then the 3 screws that hold on the cover plate are normally crazy tight and need an impact driver or large PH3 to undo them. I think you would struggle with the motor in the frame.
Have now opened up, all gears is fine! Very strange this. But it was much water intrusion in the motor area. Maybe it was a short somewhere. Hall sensors or something, that prevented control to work as normal. Or there is some dirt in some gear. Actually the secondary reduction gear didn't move on first try but then it loosened up. Feels like some grain of sand there or something.
Would be interesting to remove crank shaft and big gear and see how it works with power on and throttle. Don't have that tool but will try with shaft there first.
Thanks for answers. Yes, I will, bought grease. Just waiting for the tool to arrive so I can remove secondary reduction gear.
I had put alot of grease in there in the beginning. But now it's mixed with rust and water doesn't seal so well there. But the motor and controller parts should be easier to seal. I bought this "make-your-own-gasket" thing so you can just apply that to the parts and that should seal it.