On Sat, 7 Dec 2019 at 05:50, Thomas J Powderly <[email protected]> wrote:

>
> I think I need to replace the ring magnet.


Does the motor have an encoder?
Are you using LinuxCNC?

The LinuxCNC "bldc" component can synthesise hall signals for a drive from
encoder data.
If you are not using LinuxCNC then perhaps you could use an Arduino to do
the same thing, either from encoder data or from the existing hall signals.

Most probably the magnet ring poles need to be a mirror of the internal
rotor poles. So you could make a new ring by glueing magnets to a disc or
3-d printed part.
(maybe sandwich a single ring magnet between two toothed iron pole pieces,
or even 3D printed ones:
https://shop.3dfilaprint.com/proto-pasta-magnetic-iron-175mm-samples-1495-p.asp
)

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is designed
for the especial use of mechanical geniuses, daredevils and lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1912

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