Mora wrote: ↑
Aug 21 2018 12:49pm
It has 40 magnets around the rotor
That makes it a 20-pole(pair) motor, as far as settings go in controllers that need that.
I have no idea about actual winding scheme but it looks like three stator teeth are wound as one magnetic pole, wire skips next 6 slots and there is another pole starting from there. It looks delta wound as I see no wye (star) point
The pics don't show the whole winding-connection side, but from what I can see in them, I don't see the star connection either.
Does winding pattern matter in this situation or is it only magnet position related thing? I read that delta windings might offset timing by 30 degrees.
It's really about the magnets; all it is detecting is the passing of magnets in the rotor.
I suppose a different winding scheme might change the timing of the pulses needed to drive the magnets, but the actual hall positions are determined by the magnets.
360 degrees / 36 teeth = 10 degrees mechanical for every tooth. So halls are spaced 15 degrees mechanical apart from each other.
It's the "electrical" spacing that matters. Most likely it is 120 degrees, but it could be 60, which is the other common standard.
360 degrees / 20 magnet poles = 18 electrical degrees per one full mechanical rotation. Hall sensors should be placed 120 electrical degrees apart from each other, right? How come 3 hall sensors are spaced like in pictures (every 1.5 teeth or 2nd sensor in slot and two other embedded to stator teeth)? Should I re-arrange hall sensors?
No, no reason to change it; that's a very common way of doing it.
I don't know the reasoning behind it, but pretty much every "generic chinese hub motor" (regardless of "brand name") with halls I've seen has been built that way. The UltraMotor I have off a Stromer is not--it's actually got them physically 120 degrees apart.
I've ordered new hall sensors already (Honeywell SS41G) and some thicker and more flexible phase wire (12AWG).
Just make sure you install the new sensors the same way as the old ones. If they have one facing up and the others down, do it like that. If htey're all the same way, do that.
You can test the halls for operation before replacing, if you like, per the directions at ebikes.ca 's learn-troubleshooting section.
That said, that looks like a monster torque hub; looks like 60-80mm width for the magnets, doubled up end to end like that?