Cute Motor Opened Up

[Deleted member 4366]

My 36v 250w Cute motor has just arrived. It's much lighter than the equivalent Bafang. I'm going to use it to make a more (than my last attempt) compact crank drive conversion. I needed to disassemble it because I want to shorten the threaded axle. It's interesting in that the whole motor free-wheels using a three-roller-clutch, so for those wanting to use it as a hub motor, it should have minimal drag- the same as the free-wheel on the back of your bike.
The gear-wheels are one piece two stage nylon /delrin but two gears. The inner larger helical gears are driven by one on the motor output shaft and the smaller straight-cut gears drive the ring gear on the free-wheel. They don't look very strong, so I wouldn't over-volt this motor.

It was very easy to disassemble, so, if your gears did strip, they should be easy to replace. If you can't find a spare-parts supplier, just buy the whole motor, as it was only about £50 from BMS battery.

I also bought this free-wheeling crank set from Cyclone for about £75 - in case your interested. It came with a hollowtech BB bearing assembly. It has three chainwheels: An outer one for the motor and another one the same size, and then a smaller one.

 

[Orraman]

Thank you.

Do you intend driving on the right to take advantage of 3 freewheels?
Somewhat like the Cyclone?

Dave

 

[Deleted member 4366]

Yes. As you can see, I'm using a rear motor so that I can mount a single speed free-wheel and drive the right side.

 

[wurly]

Very interesting
Someone on ES posted some pictures of the internals of one of these motors, but they weren't very clear.
Your photos are much better
I guess the three bolts inserted into the freewheel was enough to unscrew the cover?
It looks like the freewheel works without engaging the gears very much like a Tongxin but without that fragile outer ring that is prone to breaking.
Do you know what rpm they are d8veh?

 

[Deleted member 4366]

This one is supposed to be 201rpm. The three screws hold the free-wheel to the side-plate. To take it apart you only have to unscrew the side-plate. I put 4 long 5mm screws in the disc fixing holes and held them in a vice to stop the motor turning. then I used a small piece of wood as a drift on one of the three screw holes,, and it came off quite easily.