China 750 DC Motor Factory. According to the control principle of brushless DC motor, to make the motor rotate, the control department must first start (or close) the power transistors in the converter according to the sequence of the stator winding according to the current position of the motor rotor induced by hall-sensor. In a Inverter, AH, BH, CH(these are called upper arm power transistors) and AL, BL, CL(these are called lower arm power transistors) make the current flow through the motor coil in order to generate a forward (or reverse) rotating magnetic field, and interact with the magnet of the rotor, so that the motor can rotate in accordance with/against time. When the motor rotor rotates to the position where the hhall sensor senses another set of signals, the control part turns on the next set of power transistors again, so the cycle motor can continue to rotate in the same direction until the control part decides to stop the motor rotor and turn off the power transistor (or only turn on the lower arm power transistor); To reverse the rotor of the motor, the power transistor turns on in reverse order.
