noisy motor cure??

[stormb22]

any one had a noisy motor problem ? i have a alien special with bafang motor which is very noisy aliens answer was to grease inside motor gearings but this has made the problem worse,advise any one ?

 

[flecc]

The Bafang motor is noisy at low speeds and slogging up hills but should get quiet as it approaches full speed at around 15 mph.

If yours is noisy all the time, it could be the alignment of the inner core in the shell or noisy gears in the rack. When the core is withdrawn from the hub shell, it's inside spindle on the gears side has shims on it to give the right alignment. If you are confident enough to strip it, you could try reducing or increasing the number of shims to see if that corrects it's noise, but don't increase the shims enough to make the windings collide with the hub shell side plate.

There's not much you can do about the hub shell gear rack and gears unless they show signs of damage when replacement does the trick. The rack is held in with screws.

 

[stormb22]

thanks for that info,not sure what you mean about shims though i've removed the motor from the hub casing and what i have on the end of the spindle is two very thin brass washers (one with flat edge ) they slide off first and then the clutch/gearing set up slides off are the shims below this ? have looked on the bafang web site and these two washers are not even shown on the drawing

 

[flecc]

Those brass washers are the shims, that's the term for such thin spacing washers. They affect the meshing of the gears into the hub rack which in turn can affect the noise levels.

The engineering diagram doesn't show them since they are trimming devices compensating manufacturing tolerances.

There's not much that can be done about motor noise though, the variations are due to a wide variety of complex interactions and impossible to predict and difficult to accurately alleviate. Sometimes an improvement can be made but which disappears over time. In other cases motors can become quieter over time.

You might be interested in this article I wrote on noise that's on one of my websites:

Suzhou Bafang Hub Motor Noise
.

 

[stormb22]

great thanks for info

 

[jerrysimon]

** noisy motor cure?? **

Buy a Tongxin ?

Regards

Jerry