Sensor less controller?

What kind of power level do you need?
There's a lot of controllers out there that can run sensorless.
 
It's easier to find a controller that runs without Hall sensors if you use the search term "dual mode controller". Those controllers use Hall sensor signals when they're available and connected, or default to sensorless operation when Hall signals are absent or faulty.

I just got a few 350W dual mode controllers to do salvage conversions and repairs at the community bike shop where I work. They were crazy cheap on eBay from a USA based seller. I already used one to revive a bike that came in with cooked Halls. The bike sold almost immediately after hitting the sales floor.
 
Most FOC controllers should be able to run sensorless, as well. Good ones with useful setup programs (which are required for FOC controllers; they're not plug-and-play) are not cheap, though they usually operate better (once tuned for your motor) and have more useful features than the typical generics. Phaserunner, VESC, are two well-known versions discussed a lot on these forums.
 
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