Brushless DC motor circuit

The working principle of the circuit : the rotor is a permanent magnet and the stator is four sets of coils. The four sets of
coils are respectively supplied with pulse signals controlled by the rotor, forming a rotating magnetic field to make
the rotor run. BC, the feeling comes from LED . The light signal to control lC. , BC3, so that they
are turned on and off (or turned off, saturated and turned on) respectively, so that the phase difference between L1 and L2 is
1800. In the same way, L3 and L4. The phase difference is 180°. The changing phases of the light signals from LED2 and LED 1
are 45° out of phase. Set four groups of coils as shown in the figure to form a
rotating magnetic field controlled by the rotor (no dead center).