I have a KFP0933 KitchenAid mixer which uses this motor: picture PN W10467162.

At the rear end of the motor shaft there is a sensor which I assume is for RPMs: picture

There was a magnetic ring around the shaft, which I broke: picture

And that's my story. I need to replace it because now the mixer does not work properly.

I took some rough measurements and the ring seems to be 15 mm in diameter, 8 mm inner diameter with a 3.5 mm thickness and 5 mm height: diagram

I don't even know how to search for it. I've been looking for ferrite toroids but can't find any with the same measurements. I also don't know anything about the material.

Please and thank you

No, I ended up taking it to a service center where they first said they would need to replace the whole assembly but in the end just fixed it with a piece but they didn't give me any details and I haven't opened it to see what they did. Maybe I will.