Hello
My previous post was a little bit light, and there are some points you couldn't have guessed.
First it's a brushless motor. (you had guessed)
It's a hub bike motor.
But I don't have the tool to open it.
SO the only way I have to figure out how many poles there are without opening it is using the hall sensors.
What is the link between : how many times per turn hall sensors goes from high to low and number of poles.
Thanks
Have a nice day.