How does it work

[Serum]

And for the startup the esc works on a lower frequency. (sensorless)

At a certain point, the possition of the magnet can be determined by the speedo and at this point the controller steps up in frequency.

I think that is the reason that the elder type of controllers are not as smooth as the new ones. i think (I'm not sure about this, but it sounds very logical to me) that the elder controller just worked on a fixed switching frequency.