The another name of brushless
DC micro-motor is orthogonal
systems, which is converted direct current into alternate current,  AC inverter is working here in DC Chopper.
Brushless DC micro-motor is the composition of synchronous motor and motor driver;
it is a type of typical mechatronic product.

Brushless DC micro-motor position
sensor code to power the two-phase winding axis position ahead of the resultant
magnetic field axis of the rotor position of the magnetic field, so wherever
the starting position of the rotor is, the motor in starting moment will
produce large enough starting torque, thus it is unnecessary to stall start
winding. Brushless DC micro-motor overcomes the congenital defects of brush DC
Micro Motor, to take electronic commutator to replace the mechanical
commutator.