How does a BLDC motor work?

The stator of the brushless DC motor is the coil winding armature and the rotor is the permanent magnet. If only offer motor with fixed dc current, the motor can only produce the constant magnetic field, the motor can't turn, only real-time detecting the rotor position, according to the position of the rotor to the motors of different mutually to the corresponding current, make the rotating magnetic field of the stator produce uniform direction changes, the motor can follow magnetic field rotation.

The following figure is a schematic diagram of the rotation principle of the brushless DC motor. In order to facilitate description, the center tap of the motor stator coil is connected to the motor POWER supply POWER, and the end points of each phase are connected to the POWER tube. When the position sensor is on, the G pole of the POWER tube is connected to 12V, and the POWER tube is on, and the corresponding phase coil is energized. Since all three as the rotation of the rotor position sensor will, in turn, conduction, makes the corresponding phase winding and electricity, in turn to the stator magnetic field direction also constantly change, motor rotor followed rolling, this is the basic principle of rotating brushless dc motor, detecting of rotor position, in order to the same electricity, make the direction of the magnetic field of the stator produce continuous evenly.