Converting a hub motor to a mid-drive motor.

[Oscar_Muffin]

I was looking at Crossbreak's thread on how to convert a hub motor to a mid-drive motor. I understood some of it but the majority of it, no. So, I had a peek around inside of my motor and came up with my own idea. The only thing that I am concerned about is the friction between the shaft and the thing with the winding on and finding some way to counter-act it. Probably with bearings. Here is my idea, no fancy CAD, sorry.

Spoiler: The super secret idea - Thanks to Teklektik for re-sizing the images for my lazy backside

I was wondering if these even stands a chance of working?
Thx luv u guyz lods

 

[Skalabala]

I would keep it as is and use it as a "brushless outrunner gimbal motor"

Make sure you do not scratch or dent the copper windings.

 

[Oscar_Muffin]

I would keep it as is and use it as a "brushless outrunner gimbal motor"

Make sure you do not scratch or dent the copper windings.

I've never heard of those motors. Are they the type where the outside casing spins?

Edit: That's what I'm trying to do, sort of. But in order to do that I would have to lose the casing which is a fairly important bit in my plan. So I'm attaching the old shaft to the magnet ring thing and having that act as the output shaft.

 

[teklektik]

The sleazy thing to do is rig it like a StokeMonkey although positioned differently unless you have a longtail frame...

Ebikes.ca Cycle Stoker Kit here.
Parts here.

Your stuff resized...

View attachment 1

 

[Skalabala]

Was that motor a geared hub motor? And how does the other side plate look?
where are the rest of the motor?

Do you want to do this?
https://www.youtube.com/watch?v=OsXNJQHHGyw

Gimbal motor
https://www.youtube.com/watch?v=hEWLrnYxLl0


So you want to make the shaft spin free from the stator? You need a bearing support on the side where there is no cover on

 

[Oscar_Muffin]

Was that motor a geared hub motor? And how does the other side plate look?
where are the rest of the motor?

Do you want to do this?
https://www.youtube.com/watch?v=OsXNJQHHGyw

Gimbal motor
https://www.youtube.com/watch?v=hEWLrnYxLl0


So you want to make the shaft spin free from the stator? You need a bearing support on the side where there is no cover on

That's what I'm looking to do. I am planning on screwing the middle bit into the case so it can't rotate. Then putting some sort of disk on the shaft and welding it to the outside magnet ring thing. Then I will take one of the two bearings that are on the magnet ring thing and put it in the middle of the stator to stabilize the shaft and prevent it from grinding on the stator. I might put the other bearing in the output side of the case since it won't be needed where it is now just to add some more strength. I'll try and get some more pictures of where I am with it now to explain.

 

[Skalabala]

I do not think you want to weld on the magnet casing, it will only cause problems.
Why not keep the motor as is? And let it work like all the other hub mid drive conversions?

http://endless-sphere.com/forums/viewtopic.php?f=6&t=38553

 

[Oscar_Muffin]

Because basically I have no idea how the other conversions work. If you feel like going out of your way to help me that would be much appreciated, Everything I've done so far is reversible.

 

[Skalabala]

Post some more pictures bud Keep the motor stock and fix the shaft to the frame and then fix a sprocket to the motor.
Then it is like a big out runner

 

[Oscar_Muffin]

Post some more pictures bud Keep the motor stock and fix the shaft to the frame and then fix a sprocket to the motor.
Then it is like a big out runner

Just waiting on some mild steel and a BMX to butcher.

 

[Skalabala]

Looking at the way you want it to work... Do you have a lathe?

 

[LockH]

This one, single thread on ES that combines both Hub Motor Vs Mid-drive. So just chucking this vid in here. Tks
[youtube]OqTMgStAeuw[/youtube]

 

[Skalabala]

You need to be on drugs to watch that video clip :| :lol:

 

[spinningmagnets]

I've converted a MAC in the way that you describe. It was fun. When I got to the end product I felt the gears in the motor were too loud for me. Not horribly loud, but now there were alternatives that are quieter, sooo...

https://endless-sphere.com/forums/viewtopic.php?f=28&t=51603