Magnetic rotor replacement

[kgff]

Hello,

The axle's thread on my (probably 500w)48v scooter's brushless hub motor are damaged, for about the same price I thought I may replace the entire inner magnetic rotor with axle, and to a higher wattage, 800w/1000w, can a higher even W fit in?

An online seller asked me for these details:

fork size?
magnet width?
rotor diameter?
bearing part?

Besides fork size, are these details measureable by disassembling the motor ?

Thanks

 

[BionicBlitz]

unless you know the model of the motor and are confident with a bit of guess work and hope, you should really just open it up and take the measurements. the lower watt hubs arent too hard to open just dont let the magnets pinch your fingers :} if its old might have to encourage the axel out of the bearings with a block of wood or something that wont damage it. if you have access to a shop its not too hard to weld it up and re thread the axel

 

[kgff]

Maybe I was wrong about the issue and the threading is fine,but the axle is to short for the scooter's fork
This issue started after I moved the wheel rightwards (by moving washers from right to left) so now the nut is loosely screwed on this slope, but is this slope normal or the axle is broken?

Is it possible to weld that sope to into a regular axle?

 

[BionicBlitz]

looks like its supposed to be like that... for the wires to bend more freely.. if that setup works id consider getting a pressure washer (the kind that collapse and keep pressure on the nut) and/or a nut with the nylon insert, it stops then from vibrating loose. locktite would work too i suppose...

 

[kgff]

looks like its supposed to be like that... for the wires to bend more freely.. if that setup works id consider getting a pressure washer (the kind that collapse and keep pressure on the nut) and/or a nut with the nylon insert, it stops then from vibrating loose. locktite would work too i suppose...

I got loctite an a nylon washer, will try and test it asap
Is that a pressure washer (aka spring washer) ?

Thanks a lot

 

[BionicBlitz]

yea, thats what i was thinking of, forgot the name. but if theres room for it maybe try one of those :}. if the axel is loose in the drop outs (can rorate at all) itll undo the bolts aswell

 

[kgff]

yea, thats what i was thinking of, forgot the name. but if theres room for it maybe try one of those :}. if the axel is loose in the drop outs (can rorate at all) itll undo the bolts aswell

I think that it fits the dropouts well.. I tried loctite, see if it holds up
I can add a spring washer, but then there will be even less whole-threading, so I just applied loctite to the axle, I'll test it soon :thumb:

 

[amberwolf]

I got loctite an a nylon washer, will try and test it asap

A nylon washer will compress and flow, allowing the nut to loosen; you do not want to use one on something that you wish to stay tight.

 

[BionicBlitz]

meant the nuts with nylon inserts believe they're just called "lock nuts"

 

[amberwolf]

Yes, those are often called Nyloc(k) nuts.

https://en.wikipedia.org/wiki/Nyloc_nut

Part of the nut, at the "far end" (part that goes toward the non-head end of the bolt or axle), has a nylon (or other plastic-type material) ring captured inside it, whcih is smaller diameter than the threading, so forcing the nut onto the bolt or axle compresses that, and it squeezes back because it's captured inside the metal nut, and can't "flow" away over time.

 

[kgff]

I got loctite an a nylon washer, will try and test it asap

A nylon washer will compress and flow, allowing the nut to loosen; you do not want to use one on something that you wish to stay tight.

my bad I actually meant nyloc nut

So far the nut/loctite doesn't get loosen, but I need to give it more time to be sure