In order to get the motor running, the control unit must detect the position of the motor rotor using the hall-sensor. Based on this information, it will determine the order in which the inverter's power transistors are turned on or off to ensure the correct current flows to each stator winding. This generates a rotating magnetic field which interacts with the rotor's magnet to induce movement in a clockwise or counterclockwise direction. As the rotor turns and reaches a new sensing position, the control unit triggers the next set of power transistors to maintain rotation in the same direction.
It is important to note that power transistors must be opened in a specific order and never simultaneously, as this will result in short-circuiting and damage to the equipment. The sequence for opening the transistors is AH, BL → AH, CL → BH, CL → BH, AL → CH, AL → CH, BL. However, the response time of the electronic components must also be considered when switching off and on power transistors to avoid improper closure and short circuits.
Ultimately, the successful operation of the motor depends on the precise and coordinated activation of the inverter's power transistors as well as the accurate detection of the motor rotor's position.