Control principle of DC brushless motor

dc brushless motor control principle, let the motor turn up, first control department must be based on hall-sensor sensor to the motor rotor position, and then in accordance with the stator winding to open (or close) converter (inverter) in the power (Hereinafter referred to as the upper arm power transistor) and AL, BL, CL (these are called lower arm power transistors).

so that the current flow through the motor coil to produce forward (or reverse ) Rotate the magnetic field and interact with the magnet of the rotor, so that the motor can be rotated in time / reverse. When the motor rotor rotates to the position where the hall-sensor senses the other set of signals, the control section turns on the next set of power transistors again so that the cycle motor can continue to rotate in the same direction until the control section decides to turn off the motor when the motor is stopped Transistor (or only the lower arm power transistor); to the brushless dc motor rotor reverse the power transistor to open the reverse order.