drewjet wrote:I have had some limited success with getting my 3220 to run on hall sensors. I made a fixture similar to Burtie's but I have it on the inside and am using the magnetic field coming out the side of the rotor. The video attached explains it.
Any recent developments with the Hall sensors inside your 3220? I got my 3220 and will be opening it up today. Looks like I should set the sensors up vertically spaced 30 degrees and try to null unloaded current. Did you get yours working well?
Burtie wrote:Inspired by drewjets video, I tried fitting sensors inside the astro too.
It turned out to be a pretty fiddly job to get the timing right , but it works well on the bench now .
I had a couple of attempts at fixing halls to a circular piece of strip board that was machined to fit inside the end cap.
The second attempt worked better.
I needed to get the sensors further away from the stator fields.
Hall positioning was complicated by having to avoid a large lump of snot stuck to the end of the rotor, -presumably for balancing.
To sum up:
wye current was 0.6 A, delta current was 4 A (was 0.6A and 3.5A with external hall setup and also with sensorless controller), so efficiency looks pretty similar so far. With This method it took about 1 hour to make the parts and the rest of the day trying to get the timing right! -sort of the opposite way round to the external method.
I can fit both internal and external sensors to the same motor, so should be easy to do a proper comparison of performance when it is fitted to a bike.
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