On 24/05/2019 18:06, Johnny B Good wrote:
With the more traditional design of BLDC motor, this is achieved by the
extra complication of a trio of Hall Effect sensors, precisely aligned
for maximum efficiency during their manufacture, making them more
expensive.

Why can't the manufacturing process include a calibration step for the
actual location of the sensors?

In fact the controller ought to be able to self calibrate as soon as the
drum is spinning at any reasonable speed.

Andy